Patent Application
20160130809
The invention disclosed herein relates to particular construction materials, as well as processes for preparation and uses of such materials. Such materials may be intended for use as structural elements, such as structural blocks, used in the construction of buildings and civil engineering structures.
The production of blocks for masonry using vegetal additions incorporated in a lime-based binder matrix (for example hemp used to produce Chanvribloc™ blocks) is a known process in the art.
The prior art also discloses blocks used in the construction of structures, such as houses and commercial buildings, which may have properties that are either insulating or load bearing.
WO 2014072533 discloses an insulating construction material with an alleged low thermal conductivity comprising vegetal additions, as well as to a process for preparation and to uses of such a material.
It would be advantageous for there to be a structural block that had a composition and configuration that integrated both load bearing capabilities with insulating properties.
It would also be advantageous for there to be further means for providing additional reinforcement and tension bearing capabilities to a structural block.
The invention disclosed herein relates to particular construction materials, as well as processes for preparation and uses of such materials. Such materials may be intended for use as structural elements, such as structural blocks, used in the construction of buildings and civil engineering structures. When the materials are used in the production of structural blocks, such blocks may integrate load bearing capabilities together with insulating properties.
In accordance with an aspect of the present invention, structural blocks are provided that may be configured to interlock with complimentary blocks in the construction of a structure. In one embodiment, the structural block may accommodate an embedded member or strut protruding from the surface of one side of the block and a recess on another side.
In accordance with a further aspect of the present invention, a method for manufacturing an interlocking structural block is provided, comprising positioning a plurality of members into a mold, such that one end of a member extends from one surface of the structural block with an opposite end of the member terminating partway within the structural block, wherein the mold is adapted for forming a plurality of apertures extending within the structural block from an opposing surface of the structural block, the apertures adapted for engaging with an extending end of an adjacent structural block, mixing a primarily fibrous material with a primarily lime based material for forming a block composition, applying the block composition into the mold, curing the block composition in the mold, such that the block composition is allowed to form around the plurality of members, injecting a quantity of carbon dioxide into the block composition and setting the block composition in the mold for a predetermined period of time.
In accordance with a further aspect of the present invention, a method for manufacturing an interlocking structural block is provided, comprising positioning a plurality of members into a mold, such that one end of a member extends from one surface of the structural block with an opposite end of the member terminating partway within the structural block, wherein the mold is adapted for forming a plurality of apertures extending within the structural block from an opposing surface of the structural block, the apertures adapted for engaging with an extending end of an adjacent structural block, mixing hemp hurd, flax, hydraulic lime and hydrated lime for forming a block composition, applying the block composition into the mold, compressing the block composition, compressing the block composition, curing the block composition in the mold, such that the block composition is allowed to form around the plurality of members, injecting a quantity of carbon dioxide into the block composition, and setting the block composition in the mold for a predetermined period of time.
Further aspects, features and advantages of the present invention will be apparent from the following descriptions and claims.
The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, may best be understood by reference to the following detailed description of various embodiments and accompanying drawings in which:
The present invention relates to particular construction materials, as well as processes for preparation and uses of such materials. When describing the present invention, any term or expression not expressly defined herein shall have its commonly accepted definition understood by those skilled in the art. To the extent that the following description is of a specific embodiment or a particular use of the invention, it is intended to be illustrative only, and not limiting of the invention, which should be given the broadest interpretation consistent with the description as a whole.
The construction materials of the present invention are intended for use in structural elements for building structures and civil engineering structures.
In one embodiment, the materials are used in the production of structural blocks. In one aspect, the blocks of the present invention may be designed so as to integrate compression and torsional load bearing capabilities with insulation properties.
In one embodiment, each block 10 can accommodate one or more embedded member 20. The member 20, which may also be termed a strut in the art, may be embedded within the block 10 or inserted during building construction and may contribute to the load bearing properties of the block, particularly compression loads. One end of the embedded member 20 may protrude out a given distance from one side of the block 10, while the opposite end of the embedded member 20 may terminate partway within the block 10 on an opposite side.
In another embodiment, the embedded member 20 may be flush with the surface of the block and a positioning device may also be used to align and join the members together. For example, a tube with directional clips may be used between blocks to grip the abutting member ends in adjacent blocks.
Referring back to the drawings, as depicted in
In one embodiment, the extended end of the embedded member 20 may protrude from the block 10 by a distance that is approximately equivalent to the depth of the recess 30 within the block. By way of example, a block with a height of 8 inches may accommodate an embedded member that is 8 inches in length. The protruding end of the member may extend 2 inches out from the surface of one side of the block, with the remaining 6 inches embedded within the block. A recess formed within the block at the member's opposite end may be 2 inches in depth. The recess may extend immediately from the terminating end of the embedded member housed in the block, to the surface of the opposite side of the block.
A recess 30 can be of a size, shape and may be spaced apart from one another so as to align with and accommodate the protruding end of an embedded member of another block. Such an arrangement may be similar to an interlocking “pin and socket” arrangement and can function as a locating means for the purpose of accurately positioning a block with respect to an additional block(s) while also contributing to the load bearing attributes of the block under compression.
When the protruding end of an embedded member of one block is positioned into the corresponding recess of a second block, the protruding end of the embedded member may be in direct contact with the terminating end of the embedded member of the second block. As a result, the blocks can be said to auto align, and the embedded members can be said to form a stacked structure forming a load bearing structural member.
For ease of assembly, a recess within the block may have a width that is some measurement greater than the width of the embedded member. In one embodiment, the width of the recess may be ¼ inch wider than the width of the member, for example, ⅛ inches on either side of the recess (on each of the four sides when the block and recess are square), to accommodate ease of insertion of the protruding member of an adjacent block.
Any suitable binding agent, such as lime mortar for example, may be used to bind the protruding end of an embedded member of one block into the corresponding recess of a second block. Such a bond, when formed, may be stronger than the block itself.
When the embedded member and corresponding recess are interlocked, a molecular bond may be formed that can contribute to the load bearing or other structural properties of the block. In some instances, the load bearing capabilities of the block of the present invention may be several times greater than that of a hollow concrete block, and more similar to or exceeding that of a conventional stud-framed wall structure.
In another embodiment, holes 22 may be created on the block 10 that may be positioned an equal distance between the embedded members 20, as illustrated in
The composition of the member or strut 20 itself may comprise any rigid material or mixtures thereof, with any preferences to materials used directed to cost considerations and load bearing capabilities of the material. In a preferred embodiment, the embedded member may comprise any wooden material, such as fir, spruce, pine, cedar, etc. The element may also comprise composites of organic or inorganic fibers, such as hemp or carbon fiber, etc. In yet a further embodiment, the embedded member may comprise a blend of bio fibers and polymers, such as polyethylene, polypropylene or polyester. Some compatible metals may also be used. A member or strut may also be hollow, such as a hollow square or cylindrical tube. Other materials may include metals, carbon fibre or composites, 3D printed or extruded plastics or any suitable structural members.
Tensioning System
In one embodiment, the block of the present invention may be adapted so as to be tension bearing as well. As illustrated in
In one embodiment, the tensioning means 96 may be a cable, such as, for example, a tensioned non-stretch stainless steel cable. In an alternate embodiment, the system may comprise a rod.
As illustrated in
As illustrated in
Such a configuration provides a further fastening means for a structure comprising the blocks of the present invention. In particular, such a configuration may be tension bearing, in that the blocks may be adjoined together through tension suitable for non-vertical structural elements such as floors, walls, pitched or flat roof surfaces, etc.
In another embodiment, an additional member, which may be termed a compression strut 98, can be used for the purpose of increasing the compression strength of the structural element formed by tensioned blocks. As illustrated in
Other elements such as strut caps and/or mounting plates may be used in accordance with the present invention. By way of example, a strut cap may be set into a block over the protruding end of an embedded member, with the extending end extruding from the cap.
In practice, the tensioning means may be tensioned post construction, after the blocks have been aligned.
When the tensioning means comprises a cable, the tensioning procedure with regard to a roof, for example, may include the following steps:
In one embodiment, the frequency of tensioning means may need be applied only as required, for example, every meter of the assembled structure, to form a floor, roof, or other non-vertical structure, or can be a wall.
Bio-Fiber Structural Block
In a preferred embodiment, the body of the block of the present invention can comprise a primarily fibrous and lime composition. Specifically, the composition for each block may comprise the following components:
Certain benefits may be realized through the practice of a block comprising the preferred composition of the present invention. Compositions comprising hemp hurd, flax, hydraulic lime and hydrated lime may be environmentally sustainable, recyclable and may sequester carbon dioxide from the atmosphere, while providing exceptional insulating qualities.
While a concrete block may need to be restricted in size, for example 16 inches, due to weight for handling, a block of the present invention may have a length of 48 inches or more and may maintain ease of handling because of its lower density, for example, 300 kg/cubic meter.
The lime component may primarily act as a binding agent, holding the other components together. However, any suitable binding agent may be substituted in instances, for example, when a stronger bonding agent may be required. Suitable alternative binding agents can include polymer based agents, for example silica sand, pozzolans, polyester resins, or Portland or similar cement or plaster. Such alternative agents may also be used in combination with the lime component of the preferred embodiment.
The hemp hurd and fiber component can provide insulating properties, bulk, support and strength to the block and structural members in the block. However, any alternate material or combination of materials that can provide similar desirable properties may be used in the alternative. Some organic alternatives include fibrous materials, such as corn stocks, cereal grain, straw, etc. Hemp hurd is a preferred material, primarily due to its insulating qualities in relation to the other fibers.
Alternatively, non-organic materials such as Styrofoam/polystyrene or non-recyclable plastics may be used. Such materials may also be used in a shredded form. Structural fibers (oriented cellulose strands, plastics, metal or carbon filaments) may also be incorporated or substituted. The application of these non-organic alternatives may provide an additional advantage, in that such non-recyclable materials may be sequestered from the environment, or may add different qualities to the blocks (strength, conductivity, electrical or RF shielding, noise abatement, etc.).
Recyclable and Sustainable
The composition of a preferred embodiment comprises hemp hurd, flax, hydraulic lime and hydrated lime. The primarily fibrous-lime combination is organic and composed of bio-recyclable material. When the useful life of a structure that uses such blocks comes to an end, its components may be recycled. For example, the entire block may be ground up and remixed for further subsequent applications.
The components of the composition are also sustainable. For example, hemp hurd, in addition to its favorable properties, is readily available in supply and grows very quickly with little water and fertilizer.
Other favorable properties may be realized by the fibrous-lime composition of the preferred embodiment. In particular, such a combination allows the building to “breathe”. Air and humidity can pass both in and out of the blocks at a very slow rate. No vapor barrier may be required to be used.
The composition may also be resistant to mold, termites and other insect pests.
A structure using the block composition of the preferred embodiment may allow for fire resistance, due to the properties of the hemp hurd and lime mixture, or other compositions.
In another embodiment, the blocks of the present invention may be further coated with a lime finish. A block of the present invention may be coated with several, for example five or more, coats of lime.
A structure using the blocks of the present invention can be bonded to become monolithic. Such properties can be especially beneficial particularly in areas prone to earthquakes, hurricanes or tornadoes.
Water proofing or moisture resistant properties may also be realized, particularly by use of the lime component. The lime component can also allow a block of the preferred embodiment to “heal” itself. For example, a crack in the lime coating can close over time when it is subjected to moisture.
Carbon Dioxide Sequestration
The carbon dioxide sequestration properties of a block that comprises the preferred composition of the present invention allows for the removal and sequestration of the greenhouse gas carbon dioxide from the Earth's atmosphere.
The hemp hurd component of the composition can sequester carbon dioxide at a rate of over approximately 20 tonnes per hectare as the plants grow.
It is estimated that the hemp hurd-lime composition blocks of the preferred embodiment have the capability to capture/absorb over approximately 100 kilograms of carbon dioxide per cubic meter. The lime component can use carbon dioxide to cure and set the mixture. An average house comprising such blocks, for example, can capture approximately 13,000 kilograms of carbon dioxide during block production and can continue absorbing carbon dioxide for approximately 100 years.
Methods of Manufacture
The fabrication of the blocks of the present invention may be attained by means using a mold process.
During manufacture, the embedded members or struts may be cut to the desired length, such as, for example, 8 inches in length. A hole may be drilled through the lengths of the bodies of those members that will serve as conduits for the tensioning means.
A desired number of struts and perforated tubes are placed into a mold at the desired positions, in a jig.
A mixture comprising the components of the block's composition may be combined and mixed. The mixture may then be, for example, poured, sprayed or injected into the mold.
The composition may be compressed and/or heated and allowed to set. During the curing process, carbon dioxide may be injected or passed by (or through conduits within) the curing block, which decreases the cure time. Depending on the lime composition used, the blocks may also be cured in an autoclave to control the temperature, humidity and carbon dioxide environment.
A lime coating may be applied to the inner and outer face of the blocks at time of manufacture which may increase the block strength and reduce construction finishing time.
The blocks of the present invention may be pre-manufactured and then cut as desired on site.
Building Structure and Related Materials
A structure 110 and related building materials is also disclosed by the present invention, as illustrated in
In a preferred embodiment, such building materials may include blocks 112 as disclosed in the present invention. Consequently, the blocks used in the structure of the present invention may be load bearing, tension bearing and insulating.
The blocks 112 used may be of standard building construction dimensions. Height width and length may vary, depending upon the application, orientation and desired insulation requirements. For example, the blocks used for the walls of a structure may be a standard 11″ thick and 8″ high, while varying in length. Roof structure blocks may be 12″ high and 16″ wide.
The building materials may also be pre-manufactured prior to being transported to an intended building site for assembly.
A 1400 square foot house structure is provided by way of example below.
Wall Blocks
The wall blocks can be of a standard height and width, and may vary in the length. The wall blocks may be a standard 11″ deep and 8″ high, and may vary in the length. The total count below includes blocks that may be cut on site.
4″: 8
8″: 12
12″-2 struts: 13
12″-4 struts: 29
16″: 7
20″: 13
24″: 63
32″: 97
36″: 43
48″: 644
Total wall block count: 929
48″ wall starter strips—(may be made of pressure treated plywood): 65
Roof Blocks
R=roof
Ed=edge (always 48″)
S=starter
E=end
P=peak
Total counts include blocks that may be cut on site.
R24′: 1
R32″: 2
R48″: 198
Red: 20
Re24: 2
Re32: 1
Re48: 19
Reed: 2
Rs24: 1
Rs48″: 23
Rsed: 2
Rp24″: 2
Rp48″: 21
Rped: 2
Total roof block count: 296
Beam Blocks
Standard 16″: 36
16″ end block: 1
16″ end cap: 2
Standard 12″: 4
12″ end cap: 1
Total beam block count: 44
Structural Ties
Structural ties may be breathable and in one embodiment, may be made from 16 gauge stainless steel mesh.
Roof/Wall Structural Tie: 23
Peak tie: 30
Square mesh tie: 25
Structural bracket: 5
Wood (Rough Cut Unless Noted Otherwise)
1½″×12″×12″ under 12″ beam: 1
1⅝″×12″×16″ under 16″ beam: 2
2′×6′ roof starter block support (1 each):
37′-8″ long
35′-8″ long
2×6 window/door headers and footers (dressed):
8′-4″ long: 1 (back door/window)
3′-8½″ long: 1 (back window footer)
6′ long: 4 (bedroom windows)
2×4 window/door trim (dressed)
Fasteners
The fasteners used should be compatible with lime construction and can include stainless steel or ceramic coated fasteners.
Finish of the Structure
In an embodiment of the present invention, lime mortar or another suitable mortar may be brushed on all block faces that are adjacent to another block face. As a result, this can create a structure that is monolithic and sealed.
The interior walls of the structure of the present invention may be a lime rendering, which may be colored or have breathable paint applied over it. In an alternative embodiment, there is no further application required to the interior walls. In another embodiment, the interior walls may also be covered in panels of sheetrock, wood veneer or brick, preferably with approximately a minimum 1″ air space constructed between the bricks and the interior paneling.
The exterior walls of the structure of the present invention may have a plain coat bio-fiber and lime finish applied. Such an application can add to monolithic quality and building strength with a more finished look and a non-fading or fading resistant color finish. In another embodiment, the exterior walls can have a mortar application, or “stucco look”. Such an application can also add to monolithic quality and building strength with a more finished look and a non-fading or fading resistant color finish. In a further embodiment, typical wall siding brick veneer and other non permeable materials may be used, and should maintain a minimum 1″ space from the block surface. In yet another embodiment, there is no further application required to the exterior walls, and the blocks may be formed with a decorative exterior surface on them. The blocks may have embossed or patterned surfaces for decorative or other purposes such as sound absorption, water-shedding, light reflectivity and so on.
Any roofing material known in the art may be used in conjunction with the roof of the present invention structure. If non-breathable material is used, there should be an approximately one inch minimum space between the non-breathing material and the roof block. In one embodiment, the roof may be coated, for example, with a 7 coat, 100 year lime finish. In an alternative embodiment, the roof may further comprise bio-fiber breathable “clay-like” tiles which may not require an air space.
Preferred Proposed Block Benefits
A most preferred embodiment of the present invention would possess some or all of the following characteristics:
Integrated Reinforcement Means
In an alternate embodiment, the structural blocks of the present invention may comprise an additional reinforcement means. The reinforcement means can comprise an embedded, interconnecting structural webbing which may enhance the structural capabilities of a structural block. In a further embodiment, the structural blocks may accommodate one or more shear sleeves configured for engaging the embedded members of the present invention. In one embodiment, the structural blocks of the present invention may comprise both the interconnecting structural webbing and the shear sleeves. In yet a further embodiment, the structural webbing and shear sleeves may form a single integrated unit. Such an integrated reinforcement means may also be termed a structural shear web, which may be embedded within the binder/fiber matrix of the block's body.
As depicted by
Shear sleeves 64 may be sized, shaped and spaced apart from one another so as to accommodate an embedded member within. In the embodiment depicted, the distance between adjacent shear sleeves 64 may be equal or approximately equal.
According to the embodiment depicted, an integrated reinforcement means 60 may be a single integrated unit with interconnecting structural webbing, as shown in
The structural webbing can generally be of any given width or design that allows for contributing to the tension bearing attributes of a structural block and to a wall or building component made of connected blocks. In one embodiment, the structural webbing may be approximately ⅛″ thick.
Referring back to
The integrated reinforcement means 60 of the present invention can generally be formed of any materials that provide adequate shear strength and tensional loading strength while also contributing to the tension bearing attributes of a structural block. In an embodiment, the reinforcement means may comprise any generally rigid or non-stretchable, inelastic material. Some examples include, but are not limited to: polymeric materials such as silicone rubber, polyethylene, acrylic resins, polyurethane polypropylene and polymethylmethacrylate; synthetic and natural biodegradable polymers (biopolyesters, agro-polymers, etc.), copolymers; wooden materials; metallic materials; or any combination thereof, which may be incorporated with non-stretch fiber material of some sort.
In alternate embodiments, it may be beneficial to have the shear sleeves and interconnecting structural webbing made from a combination of materials. For example, in one embodiment, the shear sleeve 64 may be more malleable for accommodating possible radial expansion when engaging an embedded member, while still allowing for adequate shear strength. The interconnecting structural webbing on the other hand may require stronger properties for contributing to the tension bearing attributes. In an alternate embodiment, integrated reinforcement means 60 may be made from two or more different materials, and then assembled together to be integrated as a single component. In alternate embodiments, the shear sleeves and web support are separate components made from the same or different material(s) with either or both embedded within a structural block of the present invention.
Referring now to
The first sleeve end may have an internal face configured for engagement with an embedded member. The second sleeve end may have an internal face that is configured for engagement with an embedded member of an adjacent structural block.
As illustrated in
In one embodiment, the opening at the outer bottom surface and the outer top surface of a structural sleeve may have a width that is some measurement greater than the width of an embedded member 85. In a particular embodiment, the width of an opening may be ¼ inch wider than the width of the member, for example, ⅛ inches on either side of the opening, to accommodate ease of insertion of the embedded member 85. In a further embodiment, the diameter of an embedded member 85 may be, for example, a few thousandths larger than the diameter of the opening in the shear sleeve 84, resulting in an embedded member being forced (i.e. interference fit) into an opening of the shear sleeve 84.
Adjacent structural blocks may interlock with one another such that the protruding end of an embedded member 85 of one structural block may engage the shear sleeve opening of a second block at a second sleeve end. In one embodiment, the protruding end of an embedded member of one block may come into direct contact with the terminating end of an embedded member of a second block, within the shear sleeve of that second block, or to an internal abutment in the void of the head-end of the sleeve.
Referring now to
Although the sleeve head may be in the form of a flush head design, as shown, this is by way of example only and other geometrical designs as required are contemplated.
According to one aspect of the present invention, the integrated reinforcement means may be constructed through a manufacturing process that comprises an injection molding process. In accordance with one method of the present invention, the integrated reinforcement means may be injected molded in parts and subsequently sized or configured as required for integration within a structural block. In an alternate method, the integrated reinforcement means may be injection molded as a long strip, such as on a roll. The strip may then be cut and/or sized in accordance with the dimensions of a corresponding structural block for integration.
During manufacture, an embedded member may be cut to a desired length, such as for example, 8 inches in length. The desired number of members can be inserted into a corresponding number of shear sleeves and then fastened. The means for fastening an embedded member can include any suitable binding agent, such as lime or mortar; by way of adhesive agents such as glue; staples; or any other suitable fastening means.
A mixture comprising the components of the block's composition, such as for example, bio fiber, may be combined and mixed. The mixture may then be, for example, poured, sprayed or injected into the mold together with the reinforcement means.
The composition may be compacted or compressed and/or heated and allowed to set (for example, 4 hours). During the curing process, carbon dioxide may be injected or passed by the curing block. Depending on the lime composition used, the blocks may also be cured in an autoclave to control the temperature, humidity and carbon dioxide environment. The blocks of the present invention may be pre-manufactured and then cut as desired on site. Aspects of the manufacturing method provided in the examples above may be incorporated for embodiments in which only the structural webbing or shear sleeves are incorporated or embodiments which the structural webbing and shear sleeves do not form a single integrated unit.
The configuration of the reinforcement means incorporated with a structural block may afford certain additional benefits during manufacture and storage. Mechanical means, such as a liner robot, may pick the structural blocks up by the embedded members attached to the integrated reinforcement means after molding. In a particular embodiment, the bottom of the sleeves, such as at the enlarged or lipped sleeve head at the second sleeve end of the shear sleeve, may be flush to the surface of the structural block, as may the bottom side of an associated web. During curing or storage, structural blocks may be stacked a given height (such as 20 feet, 30 feet, etc.). The protruding upper end of an embedded member on a lower block will support the integrated reinforcement means on the bottom side of an upper block so as to allow a 2 inch space, for example, between the upper and lower blocks. As such, a smaller foot print of floor area may be required than, for example, the use of a roller system method. Racks and block handling for storage during block curing may also be reduced or avoided, and/or curing times reduced by providing inter-block circulation of air or air enhanced with CO2.
The configuration of the reinforcement means incorporated with a structural block can also provide increased compression strength to a structural element formed by the blocks, including blocks adapted to accommodate a tensioning system, as illustrated in
The structural webbing can provide structural support and assist in keeping the embedded members of a structural block properly spaced so as to avoid the compressing together of the members, or in keeping adjacent pairs of tensioned struts and cable or rod essentially equidistant throughout their length, without needing structure inherent in the block material. In addition, the use of a compression strut, as depicted in
By way of example, the structural web may make use of a compression strut between adjacent embedded members unnecessary during post or pre-tensioning in blocks adapted to accommodate a tensioning system, such as in roof or beam blocks.
In the preceding description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the embodiments of the invention. However, it will be apparent to one skilled in the art that these specific details are not required in order to practice the invention.
The above-described embodiments of the invention are intended to be examples only. Alterations, modifications and variations can be effected to the particular embodiments by those of skill in the art without departing from the scope of the invention.
| Number | Date | Country | |
|---|---|---|---|
| 62032192 | Aug 2014 | US | |
| 62100790 | Jan 2015 | US |
