Patent Application
20120085049
This invention relates to building systems which largely replace the upright uses of concrete, whether ready-mix concrete or pre-fabricated concrete blocks, or other pre-fabricated concrete products, in construction projects. In general, the invention relates to enclosed buildings as well as other structures, and replaces the concrete in below-grade frost walls and foundation walls, and in above-grade walls. Such concrete structures are replaced, in the invention, with structures based on fiber-reinforced polymer materials (FRP) and the bottoms of such FRP walls may be integrated with a concrete footer/floor.
Certain improvements in building construction, including building panels, walls, buildings and appurtenances, methods of making building panels, and methods of constructing walls, wall systems, and buildings are taught in co-pending applications of common assignment as follows:
all of the above being incorporated herein by reference, in their entireties.
There is a need, in the construction industry, for additional improvements in light weight structural building panels and building systems incorporating such building panels. For example, generally continuous building panels of any desired length up to a maximum length per panel, may be selectable in length, in height, and in thickness, whereby such structural building panels may be used in applications where concrete is conventionally used in residential, commercial, and industrial construction. Such structural building panels should be strong enough to bear the primary compressive loads and lateral loads which are imposed on the underlying walls in a building enclosure or other building structure.
In light of severe wind conditions, which occur periodically in some locales, there is a need for building systems where overlying building structure is securely anchored to an underlying wall structure such as a foundation, whereby attachments between the underlying foundation and the overlying structure assist in preventing separation of the overlying structure from the foundation under severe wind conditions, and where the foundation wall is securely and automatically anchored to the footer by the process of creating the footer.
There is also a need for walls which are generally impermeable to water, including at joints in the wall.
These and other needs are alleviated, or at least attenuated, by the novel construction products, and methods, and building systems of the invention.
This invention includes light weight fiber-reinforced polymeric (FRP) structural building panels and panel assemblies, sized and configured for construction of non-portable wall structures permanently fixed to the ground, optionally tying overlying structure to an underlying footer through such panels and panel assemblies. In integrated building systems of the invention, the footer can include spaced footer components, with main footer components extending between and about the spaced footer components, and the footer and a floor at the footer level may be integrated, and the foundation wall may be part of a unitary structure fabricated by flowing fluid concrete under segments of the wall such that the lower portion of the wall is embedded in the concrete, while anchors from the wall extend into the space into which the concrete is being flowed. Extension flanges of the foundation wall, or mechanical fasteners tied to the foundation wall, can be used to tie the foundation wall to the underlying concrete, and to tie an overlying wall or floor to the foundation wall. Fiber schedule and orientation in the panels provide enhanced properties of strength of a panel/wall per unit dimension relative to mass of the panel/wall per unit dimension and/or quality of distribution of resin within the panel. Panel profiles as molded, and molds to make such profiles, enhance panel fabrication.
In a first family of embodiments, the invention comprehends a method of fabricating a structure foundation having a first length. The method comprises preparing, as needed, an elongate footer trench, the footer trench having a bottom, and a second length; establishing a first set of footer elements in the footer trench, the first set of footer elements being spaced from each other along the length of the footer trench; placing wall elements on the first set of footer elements such that the wall elements span the spaces between respective ones of the first set of footer elements; and after placing the wall elements on the first set of footer elements, establishing a second set of footer elements under the wall elements so as to create a continuous-length footer under the wall elements, the continuous-length footer comprising ones of the first set of footer elements and ones of the second set of footer elements.
In some embodiments, the invention further comprises fabricating the first set of footer elements in the footer trench, with elongate reinforcing material, optionally steel reinforcing rods, extending through and between respective ones of the first set of so-fabricated footer elements, and the elongate reinforcing material extending along the length of the footer trench.
In some embodiments, the establishing of the second set of footer elements under the wall comprising flowing fluid concrete under the wall elements and onto tops of the first set of wall elements.
In some embodiments, the method includes locating the footer elements in the trench such that a footer element of the first set of footer elements is positioned under each joint between adjacent ones of the wall elements whereby each such wall element is supported by a footer element of the first set of footer elements, at each joint between wall elements.
In a second family of embodiments, the invention comprehends a footer having a top, and being defined along a length of a footer path, the footer comprising a plurality of individual mini footers, spaced from each other along the length of the footer path, a given such mini footer having atop and a bottom, and opposing sides extending along the length of the footer path, and a plurality of ready-mix concrete main footer components extending along the length of the footer path, and extending between respective ones of the mini footers such that the mini footers and the main footer components collectively define a continuous-length footer.
In some embodiments, at least one of the main footer components extends about at least one of the mini footers and joins an adjacent main footer component such that the combination of the at least one main footer component and the adjacent main footer component define a single concrete structure.
In some embodiments, the main footer components extend about the mini footers so as to define an extended-length footer wherein at least a majority of the mini footers are covered on at least one side or top of the mini footers by the main footer components thereby directly interfacing the respective mini footers within the collective span of the concrete which forms the main footer components.
In some embodiments, the main footer components extend over the tops of the mini footers, and about at least one side of the mini footers so as to enclose the mini footers in the main footer components on the tops and at least one side of the respective mini footers.
In some embodiments, the main footer components cover the mini footers on the tops of the mini footers and on the opposing sides of the mini footers.
In some embodiments, the footer further comprises one or more reinforcing rods, optionally steel reinforcing rods, extending along the length of the footer path, extending from one such mini footer through a main footer component and into a next-adjacent mini footer.
In some embodiments, the invention comprehends a concrete base comprising a such two-component footer, the mini footers are concrete mini footers, and the concrete base comprises a concrete slab adjacent the footer and extending away from the footer as a structure unitary with the main footer components.
In some embodiments, the invention comprehends a foundation comprising a such two-component footer, and a foundation wall, a lower portion of the foundation wall being embedded in the footer.
In some embodiments, the foundation wall interfaces with the top of at least one such mini footer and extends upwardly from such mini footer.
In some embodiments, the footer has first and second opposing sides, the main footer components extend over the tops of the mini footers, and extending across the mini footers on at least one of the sides of the footer.
In some embodiments, the foundation further comprises anchors secured to the foundation wall and extending into the concrete base.
In some embodiments, such anchors extend through portions of the foundation wall below the top of the footer.
In some embodiments, the foundation further comprises abutment structure brackets embedded in the mini footer and participating in at least temporarily mounting the foundation wall to the mini footer.
In some embodiments, the mini footers are concrete mini footers, such that the footer is a concrete footer, having first and second opposing sides, and a width therebetween, and a depth between a top and a bottom of the footer, the concrete footer extending under the foundation wall, and an adjacent concrete slab defining a unitary concrete structure with the main footer components, the concrete slab having a second width at least two times as wide as the first width, and a depth less than the depth of the footer.
In some embodiments, the invention comprehends a building comprising one or more such foundations, and building superstructure overlying, and secured to, the one or more foundations.
In a third family of embodiments, the invention comprehends a method of fabricating a structure foundation, the foundation having a first length. The method comprises preparing, as needed, an elongate footer trench, the footer trench having a bottom, and a second length; establishing a plurality of mini footers in the footer trench, the mini footers having tops, bottoms, and opposing sides, and being spaced from each other along the length of the footer trench; placing a first set of wall segments adjacent each other, on the tops of the mini footers, such wall segments having inner and outer surfaces; joining adjacent ones of the wall segments to each other and thereby creating closed joints between respective ones of the adjacent wall segments, thereby to define a portion of the foundation wall, the wall portion having opposing surfaces which extend along the length of the elongate footer trench; placing footer forms, having form tops, along the length of the footer trench which is occupied by such mini footers and such wall segments whereby the footer forms define a footer spatial volume along the length of the footer trench, between the bottom of the footer trench and up to the elevations of the tops of the footer forms, the mini footers being disposed in the so-defined footer spatial volume, the tops of the mini footers, and correspondingly, the bottoms of the wall segments, being below the elevations of the tops of the footer forms; and with the wall segments on the tops of the mini footers, finishing fabrication of a footer along the length of the footer trench by placing fluid concrete into the footer trench, including flowing the fluid concrete under the wall segments and onto the tops of the mini footers, so as to create main footer components, interfacing with the mini footers and connected to each other about the mini footers so as to create a continuous-length footer comprising the mini footers and the main footer components, the main footer components having top surfaces which overlie the tops of the mini footers and which define a top surface of the footer, the tops of the mini footers, which support the wall segments, thus being embedded in the main footer components, bottom portions of the wall segments extending below the top surface of the concrete footer to the tops of the respective mini footers, and continuing below the top surface of the concrete footer between adjacent ones of the mini footers whereby bottom portions of the wall segments are embedded in the concrete footer for substantially the full lengths of the wall segments.
In some embodiments, the method includes positioning a such mini footer at the location of each such joint between wall segments such that each wall segment is supported by a mini footer at each such joint.
In some embodiments, the wall segments comprise a first set of wall segments, the footer trench comprises a first footer trench, further comprising defining a second footer trench extending at substantially a right angle to the first footer trench, positioning ones of the mini footers in the second footer trench, positioning a second set of wall segments on ones of the mini footers in the second footer trench, and placing concrete into the second footer trench as an extension of the concrete in the first footer trench, thus to define, in the second footer trench, a unitary part of the footer structure which is defined by the placing of the concrete, at least one of the second set of wall segments abutting and thereby supporting at least one of the first set of wall segments whereby the at least one of the second set of wall segments operates as a shear wall providing lateral support to the abutted first set of wall segments.
In some embodiments, the method further comprises, prior to, optionally concurrently with, placing the fluid concrete in the footer trench, mounting a plurality of anchors to respective ones of the wall segments such that the anchors extend, optionally laterally, from the upstanding portions of the wall segments into the footer spatial volume, such that the fluid concrete flows around at least portions of the anchors thus anchoring the respective wall segments to the concrete footer as the fluid concrete sets up/hardens.
In some embodiments, the method includes setting an outer footer form outwardly of the outer surface of at least one such wall segment, the outer footer form having a top at a higher elevation than the tops of adjacent ones of the mini footers, and flowing the fluid concrete under the wall segments to the outer footer form and upwardly above the bottoms of the respective wall segments to approximately the top of the respective outer footer form.
In a fourth family of embodiments, the invention comprehends a wall structure, comprising a footer; a wall extending upwardly from the footer, the wall having a length and a bottom; a concrete structure adjacent the bottom of the wall; and a plurality of anchors extending from the concrete structure into the wall and back into the concrete structure.
In some embodiments, the wall comprises a plurality of uprightly-oriented studs spaced along the length of the wall, and further comprises ones of the anchors extending from the concrete structure, through ones of the studs, and extending, from the studs, back into the concrete structure.
In some embodiments, the anchors extend from the concrete structure into an upright element of the wall structure and back into the concrete structure.
In some embodiments, the wall structure has an inner surface and an outer surface, and studs extending inwardly, away from the inner surface, the anchors extending from the concrete structure into ones of the studs and back into the concrete structure.
In some embodiments, the footer comprises a concrete footer having first and second opposing sides and a first width therebetween, and a depth between the top and the bottom of the concrete footer, the concrete footer extending under the foundation wall, an adjacent concrete slab defining a unitary concrete structure with the main footer components, the concrete slab having a second width at least 2 times as wide as the first width, and a depth less than the depth of the footer.
In a fifth family of embodiments, the invention comprehends a wall structure, comprising a footer; a wall extending upwardly from the footer, the wall having a length and a bottom; a concrete structure adjacent the bottom of the wall; and a plurality of anchors extending from the wall into the concrete structure and thereby anchoring the wall to the concrete structure.
In some embodiments, the anchors extend from an upright element of the wall structure into the concrete structure.
In some embodiments, the wall structure has an inner surface and an outer surface, the wall structure comprising a plurality of uprightly-oriented studs spaced along the length of the wall, and extending inwardly, away from the inner surface, the anchors extending from ones of the studs into the concrete structure.
In some embodiments, the anchors extend from said wall structure, optionally from the studs, into the concrete structure at angles of about 20 degrees to about 70 degrees from vertical.
In some embodiments, the anchors extend laterally into the concrete structure.
In a sixth family of embodiments, the invention comprehends a fiber-reinforced polymeric load-bearing building panel assembly. The building panel assembly comprises a building panel, having a top and a bottom, and a length, the building panel comprising an outer fiber-reinforced polymeric layer, an inner fiber-reinforced polymeric layer, opposing the outer layer and spaced from the outer layer, and a space between the inner layer and the outer layer, the space being occupied by thermally insulating foam; and a plurality of elongate studs spaced from each other along the length of the building panel, and mounted to the inner layer and extending away from the inner layer and away from the outer layer, a given stud having a stud top end adjacent the top of the building panel and extending to a stud bottom end adjacent the bottom of the building panel, the stud comprising an end panel remote from the inner layer, and at least one leg extending from the end panel to an inner panel of the stud proximate, and mounted to, the inner layer of the building panel, and at least one flange extending from at least one of the top or the bottom of the stud.
In some embodiments, the at least one flange is located at the bottom of the building panel and mounts the stud to a bottom plate of the building panel assembly.
In some embodiments, the invention comprehends a foundation comprising a footer, and one or more of the building panel assemblies extending into the footer, and upwardly therefrom, the at least one flange on a respective stud extends from the bottom of the respective stud and away from the stud into the footer.
In some embodiments, the at least one flange is located at the top of the building panel and extends upwardly from the end panel, as a substantially straight-line extension of the end panel.
In some embodiments, the at least one flange extends from the top of a respective stud and is bendable at a sharp angle to at least about 90 degrees from the top-to-bottom direction of extension of the respective stud.
In some embodiments, the at least one flange is secured to the overlying building structure, thereby securing the overlying building structure to the upright wall.
In some embodiments, at least one mechanical fastener extends through the at least one flange and into an element of the overlying building structure, such as into overlying upright wall structure of into overlying floor structure, thereby securing the overlying building structure to the upright wall.
The invention is not limited in its application to the details of construction, or to the arrangement of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments or of being practiced or carried out in various other ways. Also, it is to be understood that the terminology and phraseology employed herein is for purpose of description and illustration and should not be regarded as limiting. Like reference numerals are used to indicate like components.
Referring to
As illustrated in
Referring now to
Elongate angle bracket 24A resembles a conventional angle iron and may be a length of angle iron. For sake of material consistency, an FRP composition, similar to that of e.g. inner and outer layers 34, 36 may be used in an angle bracket 24A, and has sufficient rigidity to support the overlying structure in a generally angularly-constant relationship as the overlying structure is supported by the underlying building panel. As used in an upright building panel 14, angle bracket 24A has a vertical leg 24V and a horizontal leg 24H, the two legs 24V, 24H meeting at the apex of the angle formed by the two legs. Angle bracket 24A has an elongate length which generally extends up to the length of the panel between adjacent studs 23. Thus, where the distance between adjacent studs is 14.5 inches, length of the angle bracket is typically about 8-13 inches. A plurality of holes, extending through each of the legs 24V, 24H, are spaced along the length of the bracket.
At the top of the panel, bracket 24A is used to secure the overlying building structure to panel 14. Thus, one or more bolts 139 (
Bottom plate 16, where used, can be a fiber-reinforced, e.g. fiberglass-reinforced, polymeric structural member, of such dimensions as to be sufficiently rigid, and having sufficient strength, to support both the foundation wall and the overlying building superstructure, from an underlying fabricated base and to spread the weight of the overlying load over the natural support base, within the weight-bearing limits of the natural support base. Such fabricated base can be e.g. a settled bed 53 (
The bottom plate, where used, can be attached to the upstanding wall section by brackets 24A using e.g. steel bolts or screws which extend through vertical leg 24V of the bracket and into and through inner layer 34, and through the horizontal leg 24H and into and through the bottom plate. Adhesive can be used instead of screws or bolts to secure vertical leg 24V to the wall panel. A wall system which includes a bottom plate can be used without a footer. In such instance, the bottom plate is sufficiently wide, thick, dense, and rigid, to provide effective compression and bending support normally attributed to the footer. Thus, whether bottom plate or footer, the structure between the load and the natural base distributes the overlying load over a sufficiently wide area of the underlying base that load per unit area exerted on the underlying base is no more than the load capacity of the underlying base such that the underlying base can support the building load for an indefinite period of time without substantial vertical or lateral movement of the underlying base. Where a footer is used in combination with the bottom plate, the bottom plate need not have as large an area because the footer takes over the function of load distribution to the underlying base.
The bottom plate typically extends laterally inwardly into the building beyond the primary surface 25 of inner layer 34 at the main run wall section, and may extend by a distance corresponding to at least the thickness of the building panel which includes studs 23, whereby the area of the bearing surface presented to the footer or the underlying support base where no footer is used, including the load presented by studs 23, distributes the overlying load at least over the area of the footprint of the wall as well as over the area represented by the cavities between studs 23.
The top plate is sufficiently wide, thick, and rigid to provide a support surface, interfacing with the underlying upstanding wall section, and distributes the load of the overlying building structure, at least regionally, along the length of the wall. The top plate can conveniently be made from fiber-reinforced polymeric material, or from conventional dimension wood lumber whereby overlying building structures can be conventionally attached to the underlying foundation wall structure at the building site by use of conventional fasteners, conventionally attached to the top plate.
Referring to
Inwardly-directed lateral forces which are imposed on the foundation wall at or adjacent top plate 20 are transferred to main floor 40 of the building (
Still referring to the main run wall section 22 (
In the embodiments illustrated in
In the embodiments illustrated in
Studs 23 can be conventional wood e.g. 2×4 or 2×6 studs, or can be made by wrapping e.g. concentric layers of e.g. resin-impregnated fiberglass sheet on itself until the desired cross-sectional shape is obtained, and impregnating the fiberglass layers with a curable resin. As other illustrative embodiments, studs can be fiber-reinforced polymeric structures or conventionally-available elongate steel stud profiles known in the trade as “steel studs”. As fiber-reinforced structures, there can be mentioned 3-sided rectangular-shape structures as in
The stud can be mounted to the panel at inner layer 34 as illustrated in
Referring to
Any top plate or bottom plate can be made from conventional e.g. wood materials, with suitable waterproofing as appropriate for the intended use. Such wood can be treated to inhibit growth of wood-consuming organisms. In order to avoid issues of potential deterioration of the wood as a result of the wood contacting moisture, typically the bottom plate, when used, is a fiberglass-reinforced resinous composite, for example a pultruded plate, of sufficient thickness, width, and rigidity to provide the level of weight bearing capacity, and weight-distribution rigidity, anticipated as being appropriate, for supporting the overlying structure to be supported. However, in some embodiments, the bottom of the wall structure is placed directly on the footer, whereby no bottom plate is used.
As used herein, all fiberglass/resin composite structures, such as inner layer 34, outer layer 36, bottom plate 16, top plate 20, studs 23, and the like, can be fabricated using known techniques of dry or pre-impregnated fiberglass blanket manipulation and construction, including resin impregnation of such materials, chop spray processes, vacuum infusion processes, pultrusion, or other processes known for making fiber-reinforced composites, in order to make the desired 3-dimensional shapes. Such techniques can be used, for example, to make building panel 14, bottom plate 16, top plate 20, studs 23, brackets 24, 24A, 140, 148, 170, and the like.
Structural building panels of the invention can be manufactured in any standard dimensional sizes, as well as in custom size combinations desired for a particular building project. Thus, for example and without limitation, such panels can have heights of about 3 feet to about 5 feet, typically about 4 feet, which accommodates use of the panels in frost walls and crawl spaces; or height of about 8 feet to about 10 feet, typically about 9 feet, which accommodates use of the panels in standard-height basement walls and standard-height above-grade walls.
Wall section thickness “T” (
Studs 23 can extend inwardly from such nominal dimensions. Such stud depth is typically at least 3 inches. Such typical stud depth assists in providing desired bending resistance and vertical crush resistance, as well as in providing desired thermal insulation properties, and is instrumental in urging the wall to flex outwardly, against the lateral soil load when loaded with a downwardly-directed overlying load. Additional bending resistance can be obtained through the use of studs which have even greater depths, or greater width, inward from the inner layer. Further, additional thermal insulation properties can be obtained by adding conventional insulation material 135 between studs 23 at the inner surface of the panel as illustrated in
Typically, thickness “T” greater than 8 inches is not needed in order to satisfy structural demands or thermal insulation demands of a typical low-population-density residential building. However, in some instances, where additional thermal or structural demands are to be imposed on the building panels, then thickness greater than 8 inches is contemplated.
Length of a panel 14 is limited only by transportation capabilities. For example, such panel can be as long as the length of the truck bed which will transport the panel to the construction site. Thus, length is generally limited to about 40 feet, but can be shorter as suggested by a particular construction project requirement, or longer where suitable transport is available. Relatively longer panels can be cut for length. Typical lengths of the panel, as contemplated to be manufactured in mass production, are about 6 feet and about 40 feet, and where transportation is not a limitation, about 50 feet, about 60 feet, about 70 feet, about 80 feet, and all length increments between about 6 feet and about 80 feet. However, since an advantage of the panels is limited weight such that the panels can be installed below grade and at grade level with use of only a light-duty crane, length is in some embodiments limited to lengths which can readily be handled by such light duty crane.
In the case of highly segmented walls, relatively shorter wall segments can be desired whereby the lengths of the panels may be relatively shorter. Thus, panels as short as about 4 feet, about 6 feet, about 8 feet, about 10 feet, about 15 feet, about 20 feet, and about 25 feet are contemplated, still with minimum of 3-5 feet in height, and optionally about 8-10 feet in height, in order to perform either as a frost wall or as a full-height first story, e.g. foundation, wall.
The structural building panels of the invention provide a number of advantages. For example, the panels can be manufactured in a continuous length, and cut to any desired length for shipping, which may be a generic length, for example 10 feet, or 20 feet, or 40 feet, or whatever length or lengths is or are desired. The length needed for a particular portion of a building wall can be cut from a generic-length building panel, at the construction site, to meet specific needs, or can be cut to specific length at the panel manufacturing site, or at situs of a fabricator or other distributor. Thus if a shorter length is needed for a particular portion of the wall, the needed length can be cut from e.g. a 40-foot long section. If a longer length piece is needed, either a longer length panel can be fabricated as a unitary product at the panel-manufacturing facility, or two or more pieces can be joined together using suitable straight-run connectors, or corner connectors, as suitable for the particular assembly to be made. The respective building panels can be cut to length, using e.g. a circular saw, a ring saw, or a reciprocating saw, employing e.g. a masonry blade, and assembled to each other at the construction site.
Because the wall assembly is made primarily from fiber, resin, and foam, the pounds per cubic foot density, and thus the unit weight per foot of length of the wall assembly is relatively small compared to a concrete wall of corresponding dimensions. For example, a building panel 20 feet in length, 9 feet in height, and having a main run wall section which is nominally 3 inches thick, weighs about 900 pounds, including studs 23, and anchor brackets 24, 24A. Accordingly, a typical foundation for an average single-family residence in the US, using the invention, is about 160 feet in length and weights a total of about 7200 pounds/3265 kg whereas a concrete foundation for the same house weighs about 150,000 pounds/68,000 kg.
Rough openings for windows 27 and/or doors 29, illustrated in
As best seen in
Thus, referring to
The respective layers 34, 36, 50, and foam blocks 32, are all integrally bonded to each other to make a unitary composite structural product. Thus, the weaving layer is attached to respective elements of both the inner and outer layers, whereby the thicknesses of the inner and outer layers, as combined with the weaving layer, vary between relatively substantially thicker portions and relatively substantially thinner portions, each of which occupies about half of the length of each of the inner and outer layers. Typically, the relatively thicker portions of the combined layers 34, 50 and 36, 50 are at least 50 percent thicker than the relatively thinner portions of the layers 34 and 36. The resultant composite product functions much like an I-beam where layers 34 and 36, and combined elements of layer 50, serve as flange elements of an I-beam-like structure, and the crossing portions of weaving layer 50, function as web elements of such I-beam-like structures.
In general, all the space between inner surface 57 of the main run portion of the building panel and outer surface 56 of the panel is occupied by layers 34, 36, and 50, and the foam blocks, whereby little, if any, of the space between layers 34 and 36 is not occupied by any of the above-recited panel materials. By so generally filling the space between layers 34, 36, and reinforcing the panel using the crossing intercostal webs 50, all of the panel members are fixed in their positions relative to each other, and the panel is generally dimensionally stable under designed loading conditions, whereby especially laterally-directed loads imposed on the panel, from outside the building, whether subterranean ground loads or above-grade e.g. wind loads, are efficiently transferred from outer layer 36 and distributed among the other members of the panel, and respective portions of layers 34, 36, and 50, and studs 23, share in the support of any one e.g. vertically-directed or horizontally-directed load. The resulting panel is stiff, rigid, and sufficiently strong to support all loads anticipated for e.g. a low-population-density residential dwelling, including severe weather loads to which the building is expected to be typically subjected under normal use environments, including normal seasonal environmental extremes in the geographical location where the panel is expected to be used.
Flanges 126, legs 128, and end panel 44 generally form a unitary structure. The structure of channel stud 23 can be relatively thin, for example end panel 44, legs 128, and flanges 126 can be about 2.5 mm to about 6.3 mm thick. The overall thickness of the stud, between outer surfaces of legs 128, is about 0.25 inch to about 15 inches, typically about 1 inch to about 3 inches, optionally about 1.5 inches. Typically, end panel 44 is displaced from the flanges and the inner layer by about 1 inch to about 5.5 inches, optionally about 2 inches to about 3.5 inches. Even in the recited such thin cross-section, in light of the distance between the end panel and the flanges, and given a maximum fiberglass loading in the stud, stud 23 makes a substantial contribution to the ability of the panel to resist lateral, e.g. bending, forces imposed by ground forces, or wind forces, from outside the building.
Panels of the invention can be joined to each other using any of a variety of joinder structures known in the art such as “H” brackets, “L” brackets, and more complex-shape brackets. Such joining of the wall panels to each other can be supplemented by driving screws through such brackets and into and through inner and outer layers 34, 36 of the respective panels.
In a wall assembly, base flange 134 or side flange 138 is positioned against e.g. inner layer 34 of a building panel 14 and is mounted to inner layer 34 using e.g. self-tapping screws, and optionally is similarly mounted to stud 23 at the respective corresponding side flange or base flange. Top flange 136 interfaces with and supports top plate 20, and may be mounted to the top plate by bolts or screws (
Bracket 24 is similarly used to attach the panel to either a bottom plate, or to the footer. One of side flange 138 or base flange 134 can be used to attach bracket 24 to stud 23, while the other of side flange 138 or base flange 134 is used to attach the bracket to inner layer 34. Accordingly, bracket 24 can transfer building loads to and from both inner layer 34 and a leg 128 of a stud 23.
Referring to
Still referring to
Cap 342 is made of a rigid durable material such as a fiberglass reinforced polymeric structure. An exemplary such cap is a pultruded structure using the same material as disclosed for inner and outer layers 34, 36, but thicker, namely about 0.18 inch to about 0.50 inch thick. Other materials having similar physical properties are also contemplated as being acceptable for use in/as cap 342. More robust specifications are contemplated for more demanding implementations of the invention.
Cap 342 is affixed to building panel 14. A wide variety of methods can be used for such affixation. For example, the cap can be adhered to the building panel at the respective interfacing surfaces of layer 36 and end panels 44 using conventionally available construction adhesive or curable resin. In the alternative, screws 366 or other mechanical fasteners can be applied spaced along the length of the building panel, e.g. through inner flange 346 and into end panels 44 of the studs, and through outer flange 350 and into the main run wall section at layer 36, thus to anchor cap 342 to the underlying building panel.
Holes can be e.g. drilled in cap 342, and end panels 44, to facilitate driving the screws or other fasteners through the cap and into the respective other members of the corresponding elements of the construct.
In the embodiment illustrated in
Still referring to
Conventional wall plate 358 overlies floor 40 and is screwed or nailed into the floor joists and the rim joist by a plurality of screws or nails. Wall plate 358 and its overlying structure, shown only in nominal part, represent the overlying walls which, along with all other building structure, enclose the respective floor/story of the building and bear the associated loads which ultimately bear on the foundation wall through floor 40, joists or trusses 356, rim joist 354, top plate 20, seal 357 (
Where the building panels do not include studs, top plate 20 and/or bottom plate 16 or footer 55 can extend inwardly of inner surface 25 a distance sufficient to overlie, or underlie respectively, the top flange 136 of brackets 24, 24A mounted to inner layer 34, such that brackets 24, 24A can still be used to tie the panels to the bottom plate or footer, and/or to tie the overlying structure to the panels.
A plurality of anchor screws 362 extend upwardly in the utility run cavities/spaces 131 between the studs 23, through cap 342, through top plate 20, and into joists or trusses 356. The threads on the screws bite into the material of joists or trusses 356, and thus provide direct anchor links, spaced along the length of the wall of the building, between the foundation wall 12 and the overlying floor whereby risk of movement of the overlying building structure off the foundation, e.g. in the face of extreme environmental stresses, is substantially diminished. Screws 362 can be applied/inserted after erection of the foundation wall because of the availability of cavities 131 between the studs, so long as the joists/trusses 356 which receive screws 362 overlie cavities 131 whereby such joists/trusses are laterally displaced, along the length of the wall, from studs 23.
Where a space is available within the overlying structure, such as above the bottom stringer of a floor truss, and as suggested in
Angle bracket 24A extends generally most or all of the width of the respective cavity 131 between adjacent studs 23, and is mounted in the corner where the upper portion of the panel meets top plate 20. Bracket 24A is secured to the upper portion of the panel by screws 366 which extend into, optionally through, inner layer 34. Screws 362 extend through angle bracket 24A upwardly through weather seal 357 and top plate 20 and into joists or trusses 356, thus securing top plate 20 and trusses 356 to bracket 24A, whereby plate 20 and trusses 356 are secured to panel 14 by operation of screws 362, screws 366, and bracket 24A. Brackets 24A can be used in every cavity as desired, in alternating cavities, or at otherwise-selected cavity spacings, depending on the stresses expected to be imposed on joists/trusses 356. Angle brackets 24A can be similarly placed and secured by screws at the corner between the bottom of the panel at inner layer 34 and the underlying footer or bottom plate, as illustrated in
Returning again to
In an embodiment, not shown, outer flange 350 can extend yet further upwardly, high enough to lie against, optionally cover the outer surface of, overlying plate 358 and/or the lower portion of the e.g. stud framing which extends up from plate 358, such that fasteners can be driven through outer flange 350 and into plate 358 and/or into such overlying stud framing. Thus, cap 342 can, as desired, tie together any or all of the underlying wall, top plate 20, rim joist 354, joists/trusses 356, overlying plate 358 and the framing overlying plate 358.
Referring again to
Concrete anchors 158A extend through apertures 159 in studs 23 and into concrete slab 38, thus further securing wall 10 to slab 38 whereby wall 10 is secured against movement away from slab 38, as well as being secured against movement of the wall toward the slab. Anchors 158A are spaced along the length of the wall at intervals of no more than 6 feet, typically at about 4-foot intervals.
While described using differing nomenclature, namely wall surface and inner surface, inner surface 57 and wall surface 25 both represent the same face of building panel 14 when considered away from studs 23. Contrary to surface 25, inner surface 57 also includes the exposed stud surfaces, such as legs 128 and end panels 44 of the studs.
Inwardly-directed forces which reach the upper end of the panel are opposed by the attachments between overlying floor 40 and the upper portion of the wall. Inwardly-directed forces which are imposed on wall 10 between the top of the wall and the bottom of the wall are transferred, through the wall, to the top and bottom of the wall, thence to the concrete floor and the overlying floor or floor system, by the stiffness and rigidity of the panel as collectively defined by the interactions of the structure defined by e.g. layers 34, 36, 50, foam blocks 32, and studs 23.
In residential construction, a typical maximum downward-directed vertical load experienced by an underlying e.g. foundation wall is about 3000 pounds per linear foot to about 5000 pounds per linear foot. In buildings contemplated by the invention, building panels 14 are primary structural members which carry the bulk of the structural load which is ultimately imposed on the underlying natural base by the building. The downwardly-directed load is typically applied to the full width of the top of the wall, and can be applied anywhere along the length of the wall.
The bending horizontally-directed resistance capacity of the building panel at the locus of maximum horizontal underground bending moment loading accommodates bending of no greater than L/120 when supported in accord with ASTM E72 and a clay load. Both the vertical crush resistance and the horizontal load bending moment resistance can be designed for greater or lesser magnitudes by specifying, for example and without limitation, density of the included foam; thickness of layers 34, 36, 50; use and parameters of additional reinforcement layers and/or intercostals, panel thickness, spacing, and/or depth “T1” of studs 23 or thickness “T” of the panel in combination with depth “T1” of the structure. For example, greater thicknesses of inner layer 34, outer layer 36, and/or intercostals 50, e.g. up to 0.5 inch, or 0.75 inch, or more are contemplated where the overlying downwardly-directed loads, or the anticipated lateral loads, justify such thicker cross-sections.
Above-ground side loads, such as wind loads, are less than typical horizontally-directed soil loads. Accordingly, the absolute bending resistance capabilities of building panels intended for above-ground applications may be less than the capabilities contemplated for below-grade loads. However, the L/120 capacity performance criteria are the same, while contemplating lesser-intensity ultimate loads.
The reinforcing fiber materials used in products of the invention can be selected from a wide variety of conventionally available fiber products. Glass fiber has been illustrated in the general description of the invention, and is believed to be the currently most cost effective material. Other fibers which are contemplated as being acceptable include, without limitation, carbon fibers, Kevlar fibers, and metal fibers such as copper and aluminum, including nano-size embodiments of such fibers. Other fibers can be selected to the extent their reinforcing and other properties satisfy the structural demands of the building panel in applications for which the panels are to be used, and so long as the fibers are not pre-maturely degraded in the use environment contemplated for the respective building panels.
The lengths, widths, and cross-sectional shapes of the fibers are selectable according to the demands of the structures in which the building panels or other structures are to be used, and the processes which are used in fabricating such building panels. The overall fiber specification includes multiple fibrous elements and is also known as the fiber “schedule”. A given FRP layer e.g. 34, 36, 50 can include multiple individually-identifiable fibrous layers which, permissively, may be attached to each other e.g. by stitching, by fiber entanglement, or by other means.
The inventors herein have discovered that the positioning of the fibers relative to each other, and the orientations of the fibers, in what will be referred to herein as a “fiber substrate” or “base sheet”, as part of the “fiber schedule” has a substantial affect on especially the vertical crush strength of an upright wall when an overlying load is applied. An exemplary base sheet is a stitched, fiberglass cloth, having a first layer wherein about 80-85% of the glass is oriented in a first direction and the remainder of the glass is oriented in a second direction perpendicular to the first direction, with the predominant fiber direction in the wall being directed generally vertically between the top of the wall and the bottom of the wall. Any given wall will have its specified fiber schedule, addressing the fiber which is used in each FRP layer, in each portion of the length of the wall, e.g. around foam blocks 32 as well as the fiber which is used in the inner and outer layers.
In addition, where the panel is fabricated using resin infusion molding, relatively less dense fiber layers can be used in the architecture of the fiber schedule as flow control layers to facilitate resin flow during the panel molding process. Such flow control layers are illustrated further in the discussion, following, of
The polymer which is used to impregnate and/or carry the fiber can be selected from a wide variety of conventionally available multiple-part reaction-curing resin compositions. Typical resin is a 2-part liquid where two liquid parts are mixed together before the resin is applied to the fiber substrate. Third and additional components can be used in the reaction mixture as desired in order to achieve a desired set of properties in the cured resin. The resin mixture should be sufficiently liquidous to be readily dispersed throughout the fiber schedule thereby to fill in all voids in the fiber schedule. Examples of useful reaction curing resins include, without limitation, epoxy resins, vinyl ester resins, polyester resins, acrylic resins, polyurethane resins, phenolic resins, and recently-available eco-resins.
An example of such resin is Modar 814A® modified acrylic as the first part and peroxide-based Trigonox 44K® as the second part. The Modar 814A® is available from Ashland Inc., Dublin, Ohio. The Trigonox 44K® is available from AkzoNobel, Chicago, Ill.
For any set of reaction materials which are used to make the reacted product referred to here, a conventional additive package can be included such as, for example and without limitation, catalysts, anti-oxidants, UV inhibitors, fire retardants, fillers, and fluidity-control agents, to enhance the process of applying the resin and/or curing the resin, and/or to enhance the properties of the finished product, e.g. weather resistance, fire resistance, hardness, expansion/contraction and the like. For example, where fire suppression is a consideration, a fire suppressing material, such as a metal hydrate, may be added to the resin, and mixed in thoroughly, while the resin is in its un-reacted liquid condition. A typical such fire suppressing material is alumina tri-hydrate. The amount of fire suppressing material to be used can be determined by testing sample structures using known accepted test procedures.
The polymer/fiber composite is addressed herein as a 2-part composite where the first part is the fiber, e.g. fiberglass, and the second part represents all non-fiber components of the composite. Thus, the second part, generally referred to herein as the resin, includes not only the chemically reactable resin components which react in forming the set/hardened resin, but also all other materials which are included in the resin mixture in the fluid stage of the resin before the resin is combined with the fiber. Thus, this second component includes, without limitation, the various additives which are added to the materials which chemically react to “set” the resin, as well as fillers and any other materials which do not chemically participate to any great extent in the “setting” reaction(s) wherein the resin transitions from a liquid phase to a generally solid phase.
In general, dry fiber substrate, woven cloth, or fiber matt, is used as the fiber base for structural portions of layers such as layers 34, 36, 50; as well as for all other structural FRP elements of the invention such as studs 23, and brackets 24, 24A, 48, 148, and 170. Since the objective is to fill in substantially all voids in the fiber substrate with resin, enough resin is added to the fiber substrate to fill all such voids, whereby there should be no air inclusions, or so few air inclusions as to have no substantial effect on the physical or chemical stability, or the physical properties, of a building panel or other structure built with such resin-impregnated fiber-based layer. Overall, the glass/resin ratio is as high as can be achieved, without leaving any significant, deleterious voids in the resultant layer once the resin is cured.
Given the requirement to minimize voids, the resultant structural layer product, e.g. layer 34, 36, or 50, or legs 128 or panels 44, is about 30 percent by weight to about 65 percent by weight fiberglass, and correspondingly about 70 percent by weight to about 35 percent by weight of the second resin component. Optionally, the resultant layer is about 40 percent by weight to about 60 percent by weight fiber and about 60 percent by weight to about 40 percent by weight of the second resin component. A typical resultant layer is about 45 percent by weight to about 55 percent by weight fiberglass and about 55 percent by weight to about 45 percent by weight of the second resin component, optionally about 50 percent by weight fiberglass and about 50 percent by weight resin composition.
The top and bottom plates, as well as layers 34, 36, and 50 can be made of such polymer/fiber composite. The bottom plate can be any material which can bear the load imposed on the overlying building panel. A typical bottom plate, where used, is an e.g. about 0.18 inch thick to about 0.50 inch thick fiber-reinforced pultrusion, which is sufficiently stiff and rigid to spread the overlying load to the underlying footer generally uniformly along the length of the panel
Top plate 20 can be made of, without limitation, fiberglass-reinforced, or other fiber-reinforced, resinous materials, or other materials such as wood in the shape conventionally used for a top plate. It is contemplated that a conventional wood-based top plate serves the purpose adequately, and provides for attachment of overlying wood elements such as wood framing, using conventional fasteners and conventional fastening methods.
The purpose of the foam, such as in a foam board or foam blocks 32 in the main run wall section, and foam cores 32S in studs 23 (
Second, the foam in foam board 32 or foam blocks 32 provides substantial thermal insulation properties in the resulting building panel construct. In achieving a desirable level of thermal insulation, foam having a density of about 1.5 pounds per cubic foot (pcf) to about 8 pcf, optionally about 2 pcf to about 5 pcf, is selected. Foams less dense than the recited range of densities may not possess sufficient rigidity to stabilize the dimensions of the construct while the panel is being assembled and cured. More dense foams than the recited range typically have more structural strength, but provide less than the desired level of thermal insulation, and are more costly. In general, the foams used in the invention are closed-cell foams although open-cell foams and partially open-cell foams are contemplated as being operable in some implementations.
Foam boards and blocks 32 and foam cores 32S can be made from a wide variety of compositions including, without limitation, extruded polystyrene foam, expanded bead polystyrene foam, rigid urethane foam, or polyisocyanurate foam. The foam is moisture resistant, preferably moisture proof, and is physically compatible with, and is generally chemically inert with respect to, the compositions and structures of layers 34, 36, and 50 as well as with the compositions and structures of the legs and end panels of the studs.
An exemplary foam board or foam block 32 has, without limitation, inner and outer skins 32SK (
Skins 32SK can be any thin material which provides a modest level of protection from mechanical shock or intrusion for the foam core. For example and without limitation, another material which can be used for skins is polyethylene film. Another material is fiberglass veil attached to a layer of paper or other substrate which can give some dimensional stability to the skin. Still another example is a thin layer of foam attached to a dimensionally relatively stable layer of paper or plastic film.
Regarding fixing the respective structural layers in their designated positions, the foam fills all, or substantially all, of the spaces between the respective surfaces of layers 34, 36, and 50, can optionally form the cores of studs 23 and is in surface-to-surface contact with the respective fibrous layers as such layers are wrapped about the respective foam blocks. As the liquid resin is caused to flow around the foam, and as the foam subsequently cures, the resin bonds to the cellular foam or the foam skin layer such that, in the finished building panel, after the resin is cured, the respective FRP structural layers are adhered/bonded to the foam.
Turning to
Another embodiment of building panels of the invention is illustrated in
The resin may be added to the wrapped fiberglass layers on one or more sides of the foam blocks before the foam blocks are introduced into the process of assembling building panels of the invention. Such pre-added resin in the wrapped fiberglass layers may be cured prior to assembly of the foam blocks into a panel. In the alternative, the resin may be cured along with the curing of the resin in the inner and outer layers and/or in the studs.
As another alternative, the entirety of the resin used to consolidate the wrapping layers and to bond the wrapping layers to the foam can be added to, and dispersed in, the fiberglass layers which wrap around the foam blocks after the foam blocks have been assembled with the remaining e.g. fiber elements of the panel structure.
The fiberglass can be a pre-woven or stitched matt of fiberglass which is wrapped about a desired number of the sides of the foam block, or the fiber structure can be wrapped entirely about the foam block so as to form e.g. a butt joint or an overlapping joint where the ends of a wrap layer meet.
The fiber wrapping layer can represent an open pattern where some of the foam surface is visible through the fiber wrapping after the wrapping has been completed. In the alternative, the wrapping layer can represent a closed pattern where the fiber visually obscures substantially all of the underlying surface of the foam block.
Given the presence of the wrapping layers in the embodiment of
An exemplary process for making building panels of
Blocks 32B, 32E, and 32H thus perform as structurally-reinforcing members, previously illustrated as studs 23 and/or intercostals 50, and are herein referred to as studs.
In the first set of foam blocks, the relatively wider sides 199 of the foam blocks face toward the inner and outer layers. In the second set of foam blocks, the relatively wider sides 199 of the foam blocks face along the length of the building panel.
Given the structural orientation of foam blocks 32 in
Given the above dimensions, the depth “T1” of channel 131 between a pair of adjacent studs is the same as conventional depth, namely 3.5 inches, the same as the depths of the channels between conventional wood studs, and a width of 13 inches. Further, the 16 inch center-to-center spacing of the foam block studs provides for conventional attachment of conventional building materials such as 48-inch wide sheeting 129 on the inside of the building panel.
In the embodiment illustrated in
An inner layer 34 of fiberglass-reinforced polymer overlies both the laid-flat blocks 32 and studs 23.
Referring to
At the beginning of the process, the upper and lower mold elements, including recesses 302, are optionally coated with mold release material. In the alternative, a mold release agent can be incorporated into the resin. Next, foam stud blocks 32S, pre-wrapped with layers 308 of fiberglass, are placed into recesses 302. Foam stud blocks 32S and recesses 302 are so sized and configured that the foam blocks fit snugly in the recesses, and the top surfaces of the foam stud blocks are generally co-planar with the upper surface 304 of the lower mold element.
Next, a layer 334 of fiberglass fabric, which will become inner layer 34 of the so-fabricated building panel, is unrolled from a roll of such material mounted adjacent e.g. the right end of the mold table and is pulled over the lower mold element, e.g. from the right side to the left side, all as illustrated in
Next, foam blocks 32, pre-wrapped with layers 314 of fiberglass (
Next, another layer 336 of the fiberglass fabric, which will become the outer layer 36 of the so-fabricated building panel, is unrolled from the roll of such material mounted adjacent e.g. the right end of the mold and is pulled over the laid-flat foam blocks 32, from the e.g. right side of mold 300 to the left side of the mold. Layer 336 of dry fabric is laid over the entirety of the assemblage of foam blocks 32, 32S, whereby layer 336 becomes the top surface of the construct.
The upper and lower mold elements are brought together, with a seal therebetween, so as to form a closed and sealed mold, with the respective elements of the building panel in the mold cavity.
The mold cavity is then evacuated at a first location on the mold, drawing a vacuum which removes substantially all of the air out of the mold cavity. As the air is withdrawn from the mold cavity, curable liquid resin is fed into the cavity at a resin feed port located at e.g. an opposing side or end of the mold. The resin flows to all areas of the mold where air has been removed, thus to fill the voids left by the evacuating air and to form the continuous resin matrix about and through all of layers 334, 336, and the wrapping layers 308 and 314 of fiberglass which encompass foam blocks 32 and 32S.
Thus, resin flows into intimate bonding contact with the top surfaces of foam blocks 32S. Resin also flows into intimate bonding contact with the top surfaces of foam blocks 32. As a result, the resin in the mold flows to all areas which have been evacuated by the removed air, thus creating a continuous matrix of resin throughout the structure in all of the fiberglass layers which are in the mold. In instances where the foam in foam blocks 32 and 32S is a closed cell foam, the resin does not penetrate generally beyond the outer surfaces of the foam blocks. Where the foam is an open-cell foam, or partially open-cell foam, the resin can penetrate more deeply into the foam blocks as permitted by the permeability of the foam.
Once the mold has been closed and evacuated, and the necessary quantity of resin has been infused into the mold, the mold is maintained in its closed and sealed condition until the resin in the mold has cured. In the process of curing the resin, the mold may be heated, or not, depending on the thermal requirements associated with the curing of the specific resin being used. Where heat is required, heat is applied. Where heat is not required, the resin is typically cured at ambient temperature of e.g. 60-80 degrees F.
The cured fiber-reinforced polymeric building panel product is removed from the mold.
The draft angles shown in
While draft angles are shown at the top of the panel, with corresponding draft in the mold, such drafts can as well be used at the bottom of the panel and mold whereby the top of the panel can be molded perpendicular to the inner/outer surfaces of the panel.
While different draft angles have been illustrated for both the studs and the main run portion of the panel, in some embodiments, a single draft angle can be used for the full thickness of the panel between outer layer 36 and end panels 44 of the studs. In some embodiments, the draft angle can be limited to the studs whereby no draft angle need be used between the inner and outer layers.
For ease of release from the mold, stud legs 128, as well as the foam core, can define draft angles extending from end panels 44 to locations proximate inner surface 25 such that the studs are wider proximate inner surface 25 than at end panels 44. Such draft angles on the stud legs and foam core are about degree to about 20 degrees, optionally about 1 degree to about 2 degrees.
Once the panel has been removed from the mold, any material representing any draft angles is trimmed off the top and/or bottom of the panel with e.g. a ring saw or other known device capable of cutting FRP materials, both to shorten the panel to specified length, and to provide surfaces at the top and bottom of the panel which are perpendicular, within cutting precision capabilities, to the outer surface of the panel, such that, when the panel is installed in fabricating a vertical wall, the top and bottom of the panel present horizontal surfaces for interfacing with a footer or bottom plate, as well as for interfacing with overlying structure.
The process of
In the building panel illustrated in
Returning to
The specifications for layer 36R, including fiber content, polymer content, polymer selection, layer thickness, and method of making the layer are typically the same as for layers 34 and 36.
In some embodiments, layer 36R is added to a section of a building panel or a wall, optionally less than the entirety of the building panel or wall. Layer 36R may be added to layer 36 by e.g. adhesively mounting a fiberglass layer to layer 36 and then brushing or otherwise adding resin to the fiberglass layer, thus to fill the matrix represented by the fiberglass layer, with resin, or simply by placing the fiberglass layer on layer 36 and adding curing liquid resin to the fiberglass layer, whereby the added resin provides the bonding between layers 36 and 36R. The fiber-resin combination is then cured, thereby creating structurally-effective reinforcing layer 36R.
Layer 36R can be used selectively e.g. in locations on a wall where peak loads are expected to be applied to the wall and wherein remainder portions of the wall have adequate strength to tolerate the loads expected to be applied at such remainder portions and so do not include layer 36R. Such selective, and limited, use of reinforcing layer 36R adds to cost-efficiency of the wall by allowing a substantial portion of the length of the wall to be specified for less capacity than is needed at the peak load locations, and using layers 36R to strengthen the wall at such peak load locations.
A reinforcing layer such as a layer 36R can be used in association with the outer layer of the wall to strengthen the wall at the outer layer, or can be used in association with the inner layer to strengthen the wall at the inner layer, or can be used at both the outer layer and the inner layer. The reinforcing layer, whether inner layer or outer layer, can be continuous along the length of the wall, or can be discontinuous, used e.g. only where peak loads are to be applied to the wall.
A second reinforcing layer 34R is illustrated in
The panel illustrated in
Next, foam blocks 32, pre-wrapped with fiberglass layers 314, are laid flat on top of studs 23 and layer 34, edge to edge in the mold.
Next, layer 36 fiberglass is placed on top of the wrapped foam blocks, and layer 36R fiberglass, if specified, is placed on top of the layer 36 fiberglass.
The mold is then closed and evacuated, and resin is infused into the mold and cured. Layers 34R may be incorporated into the panel during the molding process, or can be added as desired, e.g. for localized reinforcement, after the panel is removed from the mold.
As elements of the panel, and when talking about the fiber content of respective layers, the fiber is sometimes referred to herein as fiberglass “layers” and is described in terms of the FRP layers into which such fiberglass layers will be incorporated in the resin-infused finished product. Those skilled in the art understand that the fiber layers are exactly that, fibrous layers, and that designating such fibrous layers in terms of the layers of the finished panel is done for sake of simplicity of the description. Those skilled in the art will recognize that the resin has not been added to the panel precursor unless so stated, whereby the layer designation applies to the fiber alone, and that such fiber ultimately becomes part of the recited FRP layer.
The panel illustrated in
Next, a foam board 32BD, which extends the length and width of the mold, is laid on layer 34.
Next, layers 36 and 36R are sequentially laid on the foam board. The mold is then closed, sealed, and evacuated; and resin is infused into the mold and cured.
In any of the infusion molded product, flow channels are created as needed, optionally including through the foam board, in order to facilitate flow of the resin into substantially all of the space inside the mold.
Each foam block 32 has an outwardly-facing surface 32FS, an inwardly-facing surface 321F, and opposing side-facing surfaces 32SF which connect the inwardly and outwardly-facing surfaces. In the embodiment of
In the embodiments of
The inwardly-facing surfaces of the foam blocks are covered by an inner flow-control layer 34BF of fiberglass.
Still referring to
A layer 308 of fiberglass is wrapped about each stud, covering inwardly-facing surface 32SIF and the two side-facing surfaces 32SSF. The edges of the fiberglass wrapping layer 308 are terminated at the corners of the stud foam block which are defined where a side-facing surface 32SSF of foam block 32S meets the outwardly-facing surface 32SOF of foam block 32S. Staples 372 are driven through fiberglass layer 308 and into foam block 32S adjacent the corresponding corners, thus securing the fiberglass wrapping layer to the respective foam block 32S before the wrapped stud precursors are assembled into a panel.
Inner layer 34 of the panel covers/overlies flow control layer 34BF and wraps about each of the studs, namely about the outwardly-facing surface 32SOF and the two side-facing surfaces 32SSF of the studs.
Referring again to
An exemplary material for layer 190 embodies a total of 55-ounces per square yard of fiberglass. Layer 190 has a first sub-layer defined by 51-ounces per square yard of fiberglass rovings, with the rovings oriented along the top-to-bottom height of the panel and designated as 190S, and a second sub-layer has 4-ounces per square yard of fiberglass, as sub-layer 190F, oriented perpendicular to the rovings in sub-layer 190S; with sub-layers 190F and 190S stitched together to form a single structural fiber-reinforcing element which is used as the fiber reinforcement layer 190.
The upwardly-oriented fibers in a vertical panel are oriented zero degrees to about 15 degrees from vertical in order to take advantage of the inventors' discovery that such upright orientation of a substantial portion of the fibers provides a significant increment to vertical crush strength of the panel. Typical orientation is within 10 degrees, optionally within 5 degrees, optionally within 3 degrees, of vertical.
The fraction of fibers which are so upwardly oriented is at least about 60% by weight of the fiber in the panel, optionally at least about 70%, optionally about 80-85% by weight.
Still referring to
An exemplary material for layer 308 is the same 2-layer fiberglass material used in layer 190, with the 51-ounce per square yard rovings sub-layer 308S disposed toward the stud foam block 32S and oriented in alignment with the lengths of the studs, and with the 4-ounce per square yard flow control sub-layer 308F disposed relatively away from the stud foam block 32S and oriented perpendicular to sub-layer 308S.
Again referring to
In an exemplary panel as illustrated in
In the first instance, the anchor is indicated, in
In the second instance, the anchor is indicated, in
In the third instance, the anchor is indicated, in
The actual configuration of the anchor is not critical so long as the anchor can be suitably mounted in the panel, and extends into the 3-dimensional space which is occupied by the concrete slab floor. Where individual anchors are used, the anchors are spaced close enough to each other to securely connect the slab to the wall. Typical spacing for anchors which anchor a conventional concrete wall to a conventional concrete footer or to another type of underlying concrete wall is 6 feet on center between anchors, and so 6 feet on center is believed to be an acceptable spacing for any configuration of anchors 158 or 158A. The spacing can be adjusted, closer, or farther apart, according to the structural needs of the building.
Anchors 158, whatever the configuration from the top view, can readily be fabricated from e.g. ⅜ inch (0.95 cm) to ½ inch (1.3 cm) diameter steel reinforcing rod stock. Such stock can be cut, bent, and otherwise fabricated into a wide variety of outlines, configurations for insertion into and through studs 23.
In the alternative, anchors 158, 158A, 158B can be FRP products thus to avoid the negative features of using steel in an environment which can become wetted with water. For example, anchors 158, 158B can be fabricated from pultruded rod stock. Similarly, anchors 158A can be molded FRP articles.
In any infusion molding process, it is critical that resin infuse all of the fibrous elements of the panel precursor which is in the mold. The purpose of flow control layers 36F, 190F, 34BF, 308F, and 34F is to facilitate flow of liquid resin throughout the panel construct during the process of fabricating the panel using a vacuum infusion molding process, thus to accomplish full and uniform distribution of resin throughout the mold. While exemplary flow structures have been described as 1 oz/sq ft (34 g/sq meter) CFM and 4 oz/sq ft (135.5 g/sq meter) (randomly oriented), both uni-directionally oriented, a wide variety of fibrous structures are available, which have characteristics compatible with facilitating resin flow in the precursor assembly. And, the invention contemplates use of flow-control layers in a variety of other locations, depending on the detail of the structure and location of other elements of the panel profile.
In addition to the flow control layers, which are illustrated herein, foam blocks 32 and/or 32S, or other panel elements, can be provided with elongate flow channels/grooves in order to further facilitate flow of resin throughout the panel construct in a resin infusion process. Yet further, the fiber webs can be provided with spaced apertures to facilitate flow of resin through the webs at such specified locations.
In the embodiments illustrated in
In such a panel, which is 9 feet (2.7 meters) high, lateral deflection at rated vertical and horizontal loads can be limited to no more than about 0.9 inch anywhere on the panel.
Referring to
Depending on the safety factors desirably built into the building panels, and given a known typical load capacity of 15000 pounds per linear foot in the above-illustrated example, the vertical crush resistance can be engineered to be as little as about 4000 pounds per linear foot, optionally at least about 6000 pounds per linear foot, typically at least about 8000 pounds per linear foot. At least 10,000 pounds per linear foot can be specified, as can at least 12,000 pounds per linear foot, namely any capacity up to the maximum known capacity with 0.13 inch thick layers, of about 15000 pounds per linear foot.
The panels illustrated herein, which incorporate foam cores in their studs, can be made by the vacuum infusion method provided that suitable provisions are made for resin flow, such as the flow control layers described with respect to
A variety of spacing elements have been shown interposed between the inner and outer layers, spacing the inner and outer layers from each other, and fixing the dimensional spacing of the inner and outer layers with respect to each other. The illustrated spacing elements include foam board 32BD, multiple foam blocks 32, intercostal webs 50, 150 wrapped FRP layers in combination with foam blocks, and foam blocks in combination with intercostal webs 50. The spacing elements can take on a variety of other shapes, structures, profiles, and materials, so long as the spacing elements effectively fix the spacial relationships of the inner and outer layers with respect to each other.
The various foam elements disclosed herein between the inner and outer layers are of sufficient density, rigidity, and polymer selection to fix the positions of the inner and outer layers in their respective positions relative to each other in panel precursors prior to curing the resin, and to maintain such positioning while resin is being added and cured. Once the resin is cured, the cured resin becomes the primary determinant of maintaining the positions of elements in the panel, as well as the primary determinant of the shape of the panel. Thus, while not required of the foam in all instances, the foam can contribute significantly to the dimensional stability of the panel precursor while the panel is being assembled and cured while the resin takes on that role once the resin has become cured. Typically, the foam also provides substantial thermal insulation properties between the inner and outer layers.
In a simple form, a building panel of the invention includes only inner layer 34, outer layer 36, and studs 23, with foam, such as a foam board, or foam blocks, generally filling the space between inner layer 34 and outer layer 36.
In an embodiment not shown, studs 23 can extend into the space between inner layer 34 and outer layer 36, thus into the main-run portion of the building panel, but not extend across the full thickness “T4” (
Studs 23 can be located over any structurally-reinforcing intercostal bridging member which bridges between the inner and outer layers, as illustrated in
Where, as in
Thus, in these embodiments, the stud leg and the intercostal support each other in the sense that an intercostal receives loads from e.g. outside layer 36, and transfers substantial portions of the load through the panel toward the interior of the building. Inner layer 34 will tend to deflect. But stud leg 128, which is aligned with the direction of the force vectors is not so readily deflected as the inner layer, and so receives and resists the load, sharing the load-resisting function and thereby eliminating or substantially reducing any tendency for the wall/panel to bow inwardly.
Whatever the materials used as the reinforcing fiber, the foam, and the resin, including e.g. resin fillers, all of such elements, including UV inhibitors and fire retardant additives, are chemically and physically compatible with all other elements with which they will be in contact, such that no deleterious chemical or physical reaction takes place in wall systems of the invention.
In some embodiments, the natural base may be undisturbed. In other instances the natural base may be machine-compacted before setting concrete blocks 402.
As seen in
Still referring to
As illustrated in
Referring to
Referring to
Either temporary or permanent forms can be used in fabricating base 400.
A below grade sealing membrane 420 is positioned in the corner where the lower portion of the outer surface of wall 10 meets the top of base 400, thus to provide a water barrier on the outside of the wall along the length of the base of the wall where the FRP wall meets the concrete footer portion of base 400. An exemplary membrane 418 is a rubberized asphalt product having a puncture resistant core layer. A suitable such membrane is available from Amerhart Lumber and Building Distributor, Green Bay, Wis., as BITUTHENE 3000®, made by WR Grace.
Shear wall 424 is an FRP wall having opposing first 34 and second 36 outermost FRP layers, shown in line format and a foam core 32 between layers 34 and 36. The first and second outermost layers are continuous, top-to-bottom, and extend from the proximal end of the shear wall at connector 422 to the distal end of the shear wall (not shown). As appropriate for the stresses to be supported by shear wall 424, one or more additional reinforcing layers (not shown) can be located between the outermost layers, extending generally parallel to the outermost layers. Further, the outermost layers, and any such intermediate layer, can be designed and engineered in terms of layer thickness and fiber reinforcement to sustain the magnitude of the shear load which is expected to be imposed on the shear wall during the anticipated use life of the shear wall. The shear wall can include studs 23 (not shown) as desired protruding from either or both of layers 34 or 36.
The building system foundation illustrated in
First, the area where the building is to be erected is excavated and otherwise conventionally prepared to receive footer material and to provide for sufficient depth of the footer to support the load of the proposed overlying building structure. In such excavation, all footer trenches are defined, and excavated and leveled to the elevation specified for the bottoms of the respective footer trenches, and the bottoms of the footer trenches are compacted as necessary in order to establish a suitable load-bearing surface at the bottoms of the footer trenches.
In addition to the footer trenches about the outer perimeter of the building, footers can be provided inside the outer perimeter of the building to support especially loads imposed on the foundation by disparate, e.g. distinctly different, overlying portions of the building structure. For example, stone fireplaces, water-bearing structures, and the like relatively more massive structures, may be supported by footers which are inside the outer perimeter of the building. Footers are also provided to support shear walls 408 which support, at e.g. perpendicular angles, the walls which define the outer perimeter of the building.
In addition to the footer trenches, the excavation also establishes the elevation of the area beside the footer where a floor or other slab 38 is to be established. Thus, the area to be covered by the slab 38 is excavated to its desired elevation, and compacted as necessary to define a stable base which can support slab 38 and the magnitude of the load which is expected to be placed on the slab. In addition to establishing the base which supports the slab, the elevation of the excavation, combined with the specified depth of the slab, defines the elevation of the top 426 of the slab, which is the same as the elevation 414 which defines the top of the base. Restated, before any concrete is poured at either the footer or the slab, the natural base is excavated and leveled to the elevation of the bottom of the slab, as well as to the elevation of the bottom of the footer.
As seen in
Once the footer trenches have been established, a guide is established representing the top 416 of each mini footer, for example by stringing an elevation string or cord, or by sighting a laser level, along the length of the footer location, such that adjacent mini footers which are to cooperate in supporting a given wall can be set at a common elevation. The tops 416 of mini footers 402 are below the elevation established for the top 414 of base 400. Blocks can then be placed in the footer trenches, spaced from each other by the specified distances, and with the top of each block set at its specified elevation. As each block is placed in a footer trench, a puddle of e.g. hand-mixed fluid concrete is first placed in the footer trench at the location where the block is to be placed. The block is then placed in/on the puddle of liquid concrete, the elevation of the top of the block is adjusted as necessary, and the block is leveled with respect to both the length and width of the block, all within and/or on the supporting puddle of liquid concrete. As part of the block placement process, the block is typically oriented such that apertures 404 extend along the length of the respective footer. Where footers intersect, the block is oriented such that the apertures extend along the length of a selected one of the footers.
With the blocks set and leveled, and typically after the concrete puddles have hardened sufficiently, conventional e.g. ⅜ inch (9.5 mm) or ½ inch (12.7 mm) steel reinforcing rods 410 are inserted through apertures 404 so as to extend along the length of the respective footer. Where two footers intersect at e.g. right angles, the reinforcing rods, in the footer which is not aligned with the apertures in the corner block, are tied to the rods in the intersecting footer trench, which rods are aligned with the block.
Where the mini footers are to be poured in place, the trenches are prepared as above. The same guide can be established representing the top 416 of each mini footer. E.g. wood forms are then set up for each of the mini footers at the respective mini footer locations. The top of the form for each mini footer is set at generally the elevation desired for the respective mini footer. Liquid concrete puddles can be used to assist in getting the tops of the forms to the desired elevations.
The end walls of the forms include apertures adapted to receive steel reinforcing rods 410. The apertures are oriented such that steel reinforcing rods can be inserted through the apertures, and thus through the mini footer forms, and extending along the lengths of the respective footer trenches. With the mini footer forms in place, steel reinforcing rods are passed into and through the mini footer forms such that the steel rods collectively extend the full lengths of the footer trenches to the extent specified. Also if and as specified, overlapping ends of respective ones of the steel rods are tied together in the usual manner for steel reinforced concrete construction.
With the steel reinforcing rod in place in, through, and between the so-placed mini footer forms, liquid concrete is poured into the mini footer forms, including around the steel reinforcing rods, and allowed to set up and harden. While the liquid concrete is setting up and hardening, final minor adjustments can be hand-worked to provide the desired finished elevation to the top of the concrete in each mini footer.
The mini-footer concrete is allowed to harden sufficiently to receive at least initial wall section loading. The forms around the mini footers can be removed as desired. For example, wood forms can simply be broken away from the sides and ends of the mini footers. Where pre-fabricated concrete blocks are used as the mini footers, the liquid concrete puddles under the concrete blocks are allowed to set up and harden before a load is applied.
The dimensions and strength capabilities of pre-fabricated concrete blocks are generally determined by others in the sense that pre-fabricated concrete blocks are a mass-produced commodity item purchased on the open market. Thus, dimensions and properties are determined by the block supplier. Thus, use of pre-fabricated concrete blocks is attended by certain performance limitations, especially load-bearing limitations. Load bearing limitations may be important because, as described herein after, the full load of the building structure may be imposed on the mini footers, collectively, before the main component 55 of the footer is fabricated.
The poured-in-place mini footer, on the other hand, has no such limitations. Specifically, the dimensions of the poured-in-place mini footer can be specified according to the load-bearing requirements at a specific location on a specific job site. In addition, the concrete composition can be specified for the specific location on the specific job site. Further, the steel reinforcing rod is incorporated into the load-bearing capacity of the poured-in-place mini footer by the time such load is applied. Accordingly, load-bearing capabilities are easily engineered into individual ones of the poured-in-place mini footers.
As a result, a typical poured-in-place mini footer does not have any open horizontally-extending apertures corresponding to apertures 404 in prefabricated concrete blocks. And typically the length of a mini footer, along the length of the footer trench, is greater than 8 inches. Rather, the length of a poured-in-place mini footer may extend up to 12 inches, up to 18 inches, up to 24 inches, or more. However, the length of a mini footer is generally limited to that length which is reasonably required to support the short term load imposed by, initial erection of the building; and rarely more than half the distance, center-to-center, between adjacent mini footers.
A guide is established representing specific locations for the wall sections. For example, such guide may be established by stringing an elevation string or cord, or by sighting a laser level. Once the guide is established, wall sections and/or wall panels can be placed on the mini footers in accord with the specific locations indicated by the guide.
In some embodiments, and optionally, the guide can be supplemented by, or replaced with, physical abutment structure 446 on, mounted to, or adjacent, the mini footer. Such physical structure is illustrated in
As exemplified by wood boards mounted to mini footer forms 448, abutment structure 446 need not be mounted directly to the mini footers 402, though the brackets illustrate that the abutment structure can be mounted directly to the mini footers. Thus, mounting abutment structure 446 to the mini footers is optional; while the fixation of the abutment structure relative to the mini footers is required where abutment structure is used.
Where used, such physical abutment structure is fixed, generally immovable, in position relative to the mini footer, and stays in such fixed position until the building panels, wall, are/is fixedly mounted to the mini footer.
With such optional physical abutment structure fixedly in place relative to the mini footer as in
As desired, once a building panel is in place on the respective mini footers, illustrated in
The description so far has addressed abutment structure 446 on one side of the building panel. Such abutment structure can be used to align the panel at either the inner surface or the outer surface of the building panel. With the panel in place as illustrated in
The purpose of abutment structure 446, and the supplementary abutment structure where used, is to hold the building panels against horizontal movement during the subsequent placement of ready-mix concrete against the inside, and optionally the outside, surface(s) of the building panels/wall sections.
Respective wall panels and wall sections are joined to each other such as at joints 406 using respective ones of the various joining connectors e.g. 140, 160, 422. As illustrated in
The thus erected and joined wall sections define the outer perimeter wall 432 of the respective portion, e.g. the entirety, of the building as well as internal walls, including shear walls which extend up from the mini footers. In addition, footers and walls extending up from the footers can be provided, according to the specific design of the structure being built, outside what will become the outer perimeter of the building.
If concrete anchors 158A are not already in place in respective ones of the studs, apertures 159 are formed in the studs, as necessary, typically below the defined elevation 414 of the top of the base, thus below the top of the not-yet-finished footer, and concrete anchors e.g. 158A are inserted through apertures 159, thus assembling the anchors to the respective studs 23, at the desired ones of the studs, correspondingly assembling the anchors to wall 10. Anchors 158A are typically, but not necessarily, oriented downwardly from apertures 159. Anchors are typically located away from mini footers 402 in order to avoid the potential for interference between downwardly-extending anchors and the tops of the mini footers. Such interference is suggested by the overlay of anchor 158A in front of block 402 in
In some embodiments (not shown), anchors 158A are configured and directed toward respective ones of reinforcing rods 410 and are tied to reinforcing rods 410 using conventional ties, whereby the studs, and the corresponding wall sections, are thus tied to reinforcing rods 410 by anchors 158A.
With the walls thus erected and supported by mini footers 402, if abutment structure 446 is not to be used, the walls can be braced in the usual manner, from outside the outer perimeter of the wall, in order to hold the walls stationary while ready-mix concrete is being poured and worked, and until the concrete hardens sufficiently to hold its configuration without external support.
Referring to
The footer forms may be any desired forms which can be suitably anchored so as to contain spread of, and retain, the outer edges of the footer as ready-mix concrete is caused to flow into, and fill, the space defined for the mini footer components. Thus, footer 418 forms may be as simple as conventional temporary wood forms which may be stripped away after the concrete of the main footer components has hardened. The footer forms may be more sophisticated, and permanent, forms, e.g. including water drainage capability therein, such as the FORM-A-DRAIN® forms discussed earlier.
Depending on the load-bearing specifications for the footer, and the lateral positioning of the wall on the tops of mini footers 402, the footer forms can be as close to the wall as e.g. the ends 430 of the blocks in
The next step in creating the monolithic concrete base includes pouring a fluid, e.g. ready-mix, concrete floor about the foundation. Prior to pouring such concrete, all utilities which will be encased in the concrete floor must be first constructed. Such utilities include pressure water lines, grey water drains, any footing drain lines which may be directed to a sump inside the building, and may include heating and/or electrical utilities.
Such utilities are typically constructed/installed after the main shell of the building has been fully constructed/erected and enclosed. Since the monolithic concrete base cannot be fabricated until such utilities are in place, the mini footers must support the full weight of such enclosed building structure without benefit of any support of the not-yet-installed main footer components. Accordingly, the mini footers 402 are engineered to sustain such load temporarily during the period in which the building will be constructed.
Once the floor utilities are in place, as a final step in preparation for pouring fluid ready-mix concrete in fabricating the monolithic concrete base, the elevation of the excavation which is to be overlaid by slab 38 is confirmed at various spaced locations about the area defined for slab 38, and is checked for suitable density/tamping; and any disturbance of the natural base which may have occurred subsequent to the excavation and other preparations for the slab, is repaired in late-stage preparation for the pouring of fluid ready-mix concrete.
With the mini footers, the wall sections/walls, the reinforcing rod matrix, the anchors, the forms, the shear walls, and the floor utilities and any required floor supports in place, with the walls suitably braced against lateral movement, with the bottoms of the wall sections/walls on the mini footers below the elevation 414 of the top of the prospective slab/footer/base, and above the bottoms of the footer trenches, and with the elevation of the natural base to be overlain by slab 38 established, confirmed, tamped, and otherwise prepared, the so-assembled precursor is ready to receive fluid ready-mix concrete. Substantial openings exist between adjacent ones of the mini footers, and between the bottoms of the wall sections and the bottoms of the footer trenches.
Fluid ready-mix concrete is then poured into the so-prepared space to be occupied by slab 38 and footers 55. Where the slab is disposed inwardly into the interior of the building being constructed, the ready-mix concrete is typically delivered inside the area enclosed by outer wall perimeter 432, and is flowed/worked outwardly under the wall panels, wall sections, in the footer trenches to the outermost regions of the footer trenches, including into and through any apertures 404 in the mini footers, about the ends of mini footers 402, and to outwardly-disposed footer forms 418. Ready-mix concrete may be delivered directly to the footer trenches on the outside of the perimeter wall, and to any slab outside the perimeter wall, as desired.
The fluid ready-mix concrete is filled to the tops of forms 418, which is consistent with the elevation of the top 426 of slab 38 and thus the elevation of the top 414 of base 400.
Given that the bottoms of the wall sections are resting on the tops 416 of mini footers 402, given that the tops of the footer forms 418 are at higher elevations than the tops 416 of the mini footers, and given that the top 414 of base 400 is at a higher elevation than the tops of the mini footers, the bottoms of the wall sections, and thus the bottom of the walls, are below the top 414 of the base. Accordingly, the bottom of the wall is embedded in the poured concrete base, and is typically about 1 inch (2.5 cm) to about 3 inches (7.6 cm) below top 414 of the poured concrete base. Once the concrete sets/hardens, the wall and the concrete become part of a single monolithic structure, wherein the base into which the wall is held, includes at least one slab which is unitary with the footer which underlies the wall. In addition, anchors 158 are embedded in the hardened concrete and may, further, have been tied to reinforcing rods 410. Thus, once the concrete sets/hardens, the footer, the slab, and the wall are all part of a single structural unit. The footer includes mini footers 402, the steel reinforcing material, and the main components of the footer which extend over, between, and around the mini footers and the steel reinforcing material.
After the concrete has been poured, the concrete is worked to provide the desired finish to the top surface of base 400. In some embodiments, the surface 426 of that portion of the footer which is disposed outwardly of the building from outer layer 36 of the wall, is finished with a downward slope away from the outer surface of the wall. A sealing membrane 420 may be applied to the outside surface of wall 10, at the base of the wall and draping over the top surface of footer 55, as generally illustrated in
As illustrated in
Even where a structure may not be roofed-over, the same principles can be used to fabricate any combination of monolithic footer, slab and walls.
While the embodiments illustrated in
Thus, the same principles can be used to fabricate the footer, the slab inside the building, and the slab outside the building, all as a single unit, and all fabricated at the same time.
Where a slab is being fabricated outside the building, any desired forms can be used to define the outer perimeter of such slab.
Reinforcing rods 410 can be relocated to other suitable locations so long as such rods still provide the necessary strength enhancements to the concrete in footer 55. Further, the material of rods 410 can be modified as desired, whereby rods 410 can be coated with any of a variety of polymeric materials, or can be fabricated exclusively from FRP materials.
The embodiments of
Still referring to
In the alternative, forms can be set up defining the outer perimeter of the slab; and concrete poured into the slab area and allowed to harden, thus establishing the dimensions of the slab before footer concrete is poured. After the slab concrete is set up, the footer is poured as a separate step, but again causing the concrete to flow under the bottom of the previously-set foundation wall.
While the description so far has illustrated the flowing of the fluid concrete under the wall from the inside of the wall, e.g. from inner surface 57 toward outer surface 56, in some instances, the concrete is placed in the footer space which is disposed outwardly of the wall and is then caused to flow under the wall and toward the inner surface of the wall. Thus, the concrete can be flowed under the foundation wall from either the inner side of the wall or from the outer side of the wall. The selection of which side of the wall is used as the initiating location depends on the ease of accessing the inner or outer surface of the wall versus the amount of space available between the respective inner or outer surface of the wall and the respective footer form on that side of the wall.
As illustrated in
Base panel 442 and side panels 444 are specified as rigid members which can absorb lateral stresses imposed on wall 10 from backfill material pushing against the outer surface of the wall, thus to attenuate tendency of the wall to bend at window 27. The thicknesses, materials, fiber reinforcements in sill cap 440 can be the same as for studs 23, inner layer 34, and/or outer layer 36. Thus the same fiber reinforced polymer materials can be used. The same fiber schedules can be used. The same thicknesses can be used. In typical such sill caps, the base panel and/or the side panels can be about 0.13 inch (3.3 mm) thick; but the thicknesses and fiber schedules can be adjusted to account for anticipated side loads.
Building panels and walls of the invention are essentially almost water proof; and such water proof characteristic is not generally affected by hurricane-driven rain. Outer layer 36 is, itself, very water resistant. While layer 36 is quite difficult for water to penetrate, even if layer 36 is breached, the foam blocks 32 or foam board 32BD are very water resistant in that the individual cells of the foam 32 are typically closed cells. If the foam layer is also breached, inner layer 34 is also very water resistant. In addition, where a weaving layer is used, before the breaching force reaches layer 34, the breaching force must pass through weaving layer 50, which is another layer which is difficult for water to penetrate, whether layer 50 is encountered adjacent layer 36 or adjacent layer 34. In any event, any breaching force has to penetrate multiple very water resistant layers. The FRP structures which do not include foam are similarly-effective barriers to water penetration.
Those skilled in the art will now see that certain modifications can be made to the apparatus and methods herein disclosed with respect to the illustrated embodiments, without departing from the spirit of the instant invention. And while the invention has been described above with respect to the preferred embodiments, it will be understood that the invention is adapted to numerous rearrangements, modifications, and alterations, and all such arrangements, modifications, and alterations are intended to be within the scope of the appended claims.
To the extent the following claims use means plus function language, it is not meant to include there, or in the instant specification, anything not structurally equivalent to what is shown in the embodiments disclosed in the specification.
This application is a Non-Provisional of U.S. Provisional Patent Application Ser. No. 61/404,793, filed Oct. 8, 2010, the entirety of the preceding application being incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 61404793 | Oct 2010 | US |
