Patent Grant
7337591
This invention relates to a method and apparatus for forming reinforced poured-in-place buildings for home and office. More particularly, the invention relates to a method and apparatus for producing a monolithic building on site using a unique poured-in-place fabrication technique using hardenable material such as concrete to form the desired novel constructions of the invention.
The two major categories of concrete fabrication are poured-in-place concrete and pre-cast concrete. Poured-in-place concrete has the advantage of permitting a great deal of flexibility as to the form or shape of the structure being made. Until the current invention such poured-in-place concrete methods have been limited to methods that are quite costly of time, labor, and materials.
U.S. Pat. No. 3,089,217 discloses the common poured-in-place practice of erecting a form system having parallel spaced panels interconnected by a tie system which traverses the space between the panels to form concrete walls wherein the central members of the tie system remain embedded in the concrete. The primary advantage of such an arrangement is that the forces resulting from the deposition of the initially plastic concrete are balanced out between the opposite form panels, and thus require a minimum of bracing from the outside. Such bracing is limited to maintaining the vertical orientation of the assembled form system. A core box and special ceiling forms are required to complete the disclosed construction procedure.
U.S. Pat. No. 2,516,318 is directed to a removable wall panel support structure for forming a wall in successive courses.
U.S. Pat. No. 5,218,809 discloses an earthquake resistant poured-in-place concrete structure having horizontal and vertical reinforcing bars. The '809 reinforcement assembly requires the welding of horizontal hanger cross members from which a pair of welded reinforcement grids are freely placed. The horizontal and vertical reinforcing bars are not free of each other and a stress point exists in each of the welded joint sites. There is no disclosure of a reinforcement rod suspending device that is attached to one mold cavity panel and in which reinforcing rods may be freely positioned at preselected horizontal and vertical locations within the mold cavity before the second opposing mold cavity panel is vertically disposed to provide the desired mold cavity.
U.S. Pat. No. 4,864,792 relates to prefabricated modules used in the building industry that comprise an array of flat elements made from light material, and a plurality of nettings made from welded steel wires, which extend along a lengthwise direction of the module and which are welded to a series of cross-wise wires. The nettings comprise lengthwise wires and spacing or brace wires that define sections in which the flat elements are arranged and form two panels used as lost shuttering for casting reinforced concrete. The resistance of the concrete to tensile and shear stresses is insured by a reinforcement from steel wire embedded in the cast concrete.
U.S. Pat. Nos. 1,389,803 and 4,426,061 disclose a poured-in-place concrete construction system having a reinforcement mesh disposed between opposed wall panels that are juxtaposed opposing lateral sides of a poured foundation and tied to be vertically disposed in placed.
U.S. Pat. Nos. 3,238,684 and 3,524,293 show poured-in-place wall forming systems having horizontal and vertical reinforcing rods disposed within a mold cavity formed with permanent wall panels. The '684 rods are held in place using a plurality of ties that have to be individually manipulated for the horizontal and vertical placement of the various rods used in the system. The '293 patent shows the horizontal and vertical reinforcing rods welded together unlike the freely positioned horizontally disposed reinforcement rods of the present invention.
U.S. Pat. No. 2,504,043 discloses a building form used to construct walls in courses so that reinforcing rods are laid parallel to each other in each successive coarse. The '043 process is thus extremely slow in producing a building wall.
U.S. Pat. No. 5,570,552 is directed to a modular wall forming system having a box-like block form of expanded foam plastic material with opposite, parallel, spaced apart sidewalls and end walls extending between upper and lower surfaces and defining an internal cavity for receiving concrete slurry. A plurality of transverse bridge members maintain spacing between the sidewalls at spaced locations along the length thereof. Each bridge member includes a central web extending between opposed tongues which are slidably received in T-grooves formed in the sidewalls, and has a structural configuration for slidably receiving a vertical reinforcement bar a plurality of horizontal reinforcement bars. The mold cavity sidewalls slidably receive the bridge members in a first direction while preventing substantial movement therebetween. Each of the sidewall sections and bridge members have to be handled and individually placed to form the building wall mold cavity.
U.S. Pat. Nos. 963,431 and 2,413,415 show the well known use of tie members for holding vertically and horizontally disposed wall panels in opposed facing position to receive concrete in forming a poured-in-place wall construction.
U.S. Pat. No. 3,728,836 shows a concrete form tie and rebar chair for fixing the position of a vertically disposed reinforcing rod at a location laterally spaced inwardly from the interior surfaces of the opposed wall panels. The form tie includes spreaders that fix the distance between the spaced opposed panels.
U.S. Pat. Nos. 1,692,166; 1,692,167; 1,755,960; 1,875,136; 3,481,575; and 5,547,163 each show variations of form ties that address fixing the spaced distance between opposing walls in a poured concrete forming structure.
U.S. Pat. Nos. 1,141,057 and 2,815,656 respectively disclose the formation of an upstanding curb portion on a molded concrete road slab and a foundation having an upstanding wall portion on which a wall of corrugated panels are vertically disposed.
U.S. Pat. No. 3,734,451 discloses a concrete wall form having a plurality of interconnected, unitary metal panels comprised of one or more extruded, channel-shaped intermediate sections and an extruded, channel-shaped end section at either end of the intermediate section.
U.S. Pat. Nos. 1,453,557; 5,535,565; and 6,070,380 each discloses an assembly having a unique system for attaching spaced horizontal and vertical reinforcing bars in a concrete forming structure in which the grid assembly between the interior surfaces of the panels holds opposed wall panels in place when hardenable material is poured in the mold cavity.
U.S. Pat. Nos. 4,972,646 and 5,771,648 each discloses a concrete forming system including a pair of foam panels having laterally aligned holes arranged in a rectangular grid. Cross wires or rods extend through the holes. Longitudinally extending wires or rods are located against the interior surfaces of the walls and are welded to the cross rods. Retaining means on the ends of the cross rods are disposed against the exterior surfaces of the walls to provide a sandwich construction firmly to interconnect the walls and the rods thereby forming a poured-in-place mold cavity.
The prior art makes numerous attempts to facilitate production of pre-cast reinforced concrete structures. Pre-cast concrete fabrication is directed to the formation of modular units such as building panels and room modules that are subsequently moved to the construction site and disposed into a designed structural position. This technique requires heavy lifting and moving equipment that must work on accessible terrain for accomplishing the desired building construction.
U.S. Pat. No. 4,272,050 discloses a method and apparatus for pre-casting box-like reinforced concrete room modules on an assembly line basis. Each completed module is then moved to a remote construction site and juxtaposed other modules to form a completed building. Apparatus includes a pair of movable interior forms for defining the interior surfaces of side walls and ceilings whereby one interior mold at a time can be removed when concrete is in semi-cured condition. The method includes casting a floor slab with short upstanding side wall portions to serve as guides for moving interior forms in place onto floor slab. The method also includes use of integral multiples of four serially arranged casting beds on which various procedures for forming the room modules proceed simultaneously and progressively.
Each of the pre-cast building construction systems of U.S. Pat. Nos. 3,455,074; 3,706,168; 3,961,002; 4,145,861; and 4,501,098 is associated with a particular floor plan. The '074 patent first forms reinforced modules having walls and ceiling, placing them at a building site, and then pouring floor slabs after the wall and ceiling modules are in place. The '168 prefabricated reinforced concrete building is formed of pre-cast separate footings that are spaced in an arrangement defining the floor plan of the building. Pre-cast wall-forming panels, disposed in edge-abutting relation, are supported by the footings. Roof-forming panels overlie the upper edges of the wall-forming panels. The '002 method and apparatus forms an integral building construction unit of synthetic material such as polyurethene foam that is transported to the building site after its construction. The '861 method includes placing pre-cast wall modules in trenches having the general outline of the building floor plan and subsequently pouring the floor slab and interconnecting the roof or ceiling structure. The '098 construction method forms modular structures at a remote location and later places them on a foundation laid out according to a building floor plan.
Each of the foregoing prior art systems are generally time-consuming with respect to preparation of the forming assemblies either at or remote from the building site; expensive moving and transporting equipment is needed to handle the forming equipment and/or completed modular constructions being moved to the building site; and skilled craftsmen are required to use sophisticated molding equipment to prepare for and effect the placement of hardenable material into the particular mold cavity. The advantages associated with the building construction system of the invention, and products produced thereby avoid these expensive and time-consuming prior art techniques.
The primary purpose of this invention is to provide affordable housing for people in developing countries throughout the world and is directed to a novel building construction system using poured-in-place fabrication techniques that an indigenous labor force of any nation may be employed and trained to operate.
Another purpose is to provide a floor slab and upper building construction system designed to significantly reduce production time, and to provide novel final building structures to withstand damage caused by seismic forces of an earthquake, and by high velocity wind forces of a tornado or hurricane.
An object of the invention is to provide a structural forming assembly for producing a monolithic building structure having a floor, inner and outer walls, and ceiling that is molded from a hardenable material wherein the building walls define a plurality of rooms of the building according to a preselected building floor plan.
Another object of the invention is to produce a novel molded concrete floor slab having upstanding wall portions that have a structural layout according to a preselected building floor plan and that provide an accurate pattern guide for assembling a wall mold cavity into which a hardenable material is poured and allowed to harden to form inner and outer wall segments that define the rooms of a building structure.
A further object of the invention is to provide a reinforcement rod suspending structure that is attached to a first molding surface of a wall mold cavity for freely positioning reinforcement rods horizontally at a plurality of vertically spaced locations and to facilitate the completion of the mold cavity into which hardenable material is poured and allowed to harden within the mold cavity.
A still further object is to enable the formation of a completed poured-in-place building fit for occupancy within three to four days from entry onto a building site with the novel structural forming assembly, and then forming a floor slab, and an upper building wall and ceiling structure using the assembly and process of the invention.
Another object provides a freestanding monolithic building structure including a novel reinforcement cage formation composed of coextensive horizontal and vertical floor, wall, and ceiling reinforcement rods, and a plurality of freely positioned, horizontally disposed reinforcement rods that form a plurality of substantially continuous reinforcement rings encircling the perimeter of and spaced upwardly along the building wall structure at a plurality of vertically spaced locations.
Another object of the invention is to provide a wall structure molding assembly including a reinforcement rod suspending assembly that maintains reinforcement rods in a plurality of horizontal and vertical locations within a wall mold cavity when pouring hardenable material into the mold cavity.
The structural forming assembly of the invention comprises wall molding means for forming laterally spaced, opposed molding surfaces that define a wall mold cavity for forming a wall structure. The wall molding means includes panel holding means for vertically disposing laterally spaced wall forming panels to provide the molding surfaces along opposed sides of the wall mold cavity. The cavity has an upwardly directed top opening into which hardenable material is to be poured and hardened to produce the wall structure within the wall mold cavity. Reinforcement rod suspending means is for freely positioning and retaining horizontally and freely disposed reinforcement rod means at a preselected horizontal location spaced inwardly from each opposed molding surface within the mold cavity. Means for attaching the rod suspending means to the opposed wall forming panels is for locating the horizontally disposed rod means at spaced preselected vertical locations between the spaced molding surfaces. The rod suspending means is effective to retain reinforcement rod means in place at the preselected horizontal and vertical locations while the hardenable material is being poured into and allowed to harden within the mold cavity.
A feature of the rod suspending means includes grid means that extends upwardly along the vertically disposed molding surfaces, and is sufficiently rigid to project outwardly from one vertically disposed a molding surface and rigid enough to horizontally suspend the reinforcement rod means when the grid means is first attached to the vertically disposed molding surface. In a specific embodiment, the wall forming panels are portable for removable vertical disposition to form the wall mold cavity, and panel holding means is effective to maintain the wall forming panels independently with respect to each other in the vertical disposition. The rod suspending means includes a plurality of vertically disposed retaining means spaced horizontally with respect to each other along said opposed spaced molding surfaces. The reinforcement rod means includes a plurality of rod elements that are horizontally disposed across the plurality of grid means. The rod elements extend substantially parallel to the molding surfaces and are laterally spaced with respect to each other between the molding surfaces.
A feature of the rod suspending means of the invention includes a plurality of grid elements that extend upwardly along the vertically disposed molding surfaces and between the opposed molding surfaces. Each grid element includes a plurality of tie members horizontally disposed at spaced preselected vertical locations. The grid elements include rod locating means for maintaining the reinforcement rod means at the vertical locations and are laterally spaced inwardly from each opposed molding surface while hardenable material is being poured into the mold cavity. The rod locating means includes a pair of elongated parallel grid members fixedly connected to and transversely extending across the plurality of vertically spaced tie members at each preselected horizontal location between the molding surfaces to freely retain a reinforcement rod that extends horizontally across the plurality of vertically disposed grid elements. The reinforcement rod means includes at least two elongate rod members each freely positioned horizontally to rest on a tie member at a spaced inward distance from the opposed molding surfaces and at a spaced outward distance from a centerline located between the opposed molding surfaces.
A particular device of the invention comprises reinforcement rod suspending means for freely positioning and horizontally disposing reinforcement rod means within a wall mold cavity at a preselected horizontal location between each opposed molding surface and at a plurality of preselected vertical locations spaced upwardly along opposed wall forming panels. The device includes fastening means for attaching the reinforcement rod suspending means to each of the opposed wall molding panels to retain the reinforcement rod means in place between wall forming panels at the preselected horizontal and vertical locations while hardenable material is being poured into and allowed to harden within the mold cavity.
In a specific embodiment, the preselected horizontal location is spaced inwardly from each molding surface, the wall molding panels are portable and removable, and the reinforcement rod suspending means is removably attached to the wall molding panels and includes grid means that extends upwardly along the vertically disposed molding surfaces. The grid means is sufficiently rigid to project outwardly from a single vertically disposed molding surface and rigid enough to horizontally suspend the reinforcement rod means when the grid means is attached to that vertically disposed molding surface. The rod suspending means includes a plurality of vertically disposed retaining means spaced horizontally with respect to each other along the opposed spaced molding surfaces. The reinforcement rod means includes a plurality of rod elements horizontally placed across and retained in position on the plurality of grid means. Reinforcement rod elements extend substantially parallel to the molding surfaces and are laterally spaced with respect to each other across the width between the molding surfaces.
A particular feature of the rod suspending means includes a plurality of grid elements that extend upwardly along the vertically disposed molding surfaces and between the opposed molding surfaces. Each grid element includes a plurality of tie members horizontally disposed at spaced preselected vertical locations within a wall mold cavity. Rod locating means maintains reinforcement rod means freely positioned at the preselected vertical locations, and spaced horizontally and inwardly from each opposed molding surface while hardenable material is being poured into the mold cavity. The rod locating means includes a pair of elongated parallel grid members fixedly connected to and transversely extending across the plurality of vertically spaced tie members at each horizontal location between the molding surfaces to freely retain a reinforcement rod that extends horizontally across and rests on the plurality of vertically disposed grid elements. Each end of an upper tie member and a lower tie member has a portion thereof formed back upon itself to define a loop. Each opposed molding surface includes means for receiving the loop ends of the upper and lower tie members for removably attaching the grid elements to the wall panels. More specifically, the reinforcement rod means includes at least two elongate rod members each freely positioned horizontally on a tie member at a spaced inward distance from the opposed molding surfaces and at a spaced outward distance from a centerline located between the opposed molding surfaces.
A poured-in-place forming assembly of the invention is for producing a concrete building including a molded monolithic structure consisting of floor and ceiling slabs and inner and outer building walls that form a building that includes a plurality of rooms defined by a building floor plan. The assembly comprises floor, wall, and ceiling molding means for forming laterally spaced, opposed molding surfaces that define a mold cavity to produce the monolithic structure. Floor molding means includes an upwardly directed top slab mold opening into which hardenable material is to be poured and hardened within a floor slab mold cavity. The floor slab has a top surface and upstanding inner and outer wall portions projecting upwardly from the floor slab top surface that define the inner and outer building walls according to the building floor plan. Wall molding means define a wall mold cavity having an upwardly directed top wall mold opening into which hardenable material is to be poured and hardened within the wall mold cavity. The wall molding means includes vertically disposed inner and outer building wall mold segments having wall forming panels which are laterally juxtaposed opposed sides of the upstanding inner and outer wall portions to define a wall structure having a top plan view shape according to the building floor plan. Wall forming panels for the outer building walls include internal panels for being juxtaposed internal sides of the upstanding outer wall portion, and external panels for being juxtaposed external sides of the upstanding outer wall portions to define the outer building walls of the wall structure. Wall forming panels for the inner building walls and the internal panels for the outer building walls each has the same length to form an upper ceiling edge level defining a preselected ceiling height measured upwardly from the floor slab top surface inside each room of the building floor plan. Ceiling molding means forms an interior profile of the top wall mold opening that defines the inner building walls and the internal sides of the outer building walls of the building floor plan along the upper ceiling edge level of the forming panels of the inner building walls and internal wall forming panels of the outer building walls. The external wall forming panels of the outer building walls form an exterior profile of the top wall mold opening that defines the external sides of the outer building walls of the building floor plan. The external wall forming panels are sufficiently longer than the internal wall panels to form an upper edge along the exterior profile that extends above the height of the preselected ceiling height for producing a preselected thickness for a molded ceiling slab when hardenable material is poured into and allowed to harden within the mold cavity.
A specific feature of the wall molding means of the invention includes reinforcement rod supporting means for placing horizontally disposed reinforcement rods in a wall mold cavity defined by opposed molding surfaces. The reinforcement rod supporting means is effective to freely position and suspend reinforcement rods disposed horizontally along the opposed wall forming panels within the mold cavity between each opposed molding surface and at preselected vertical locations spaced upwardly with respect to each other. The rod supporting means includes a plurality of grid means including a plurality of vertically disposed retaining means spaced horizontally with respect to each other along the opposed spaced molding surfaces. The reinforcement rod means includes a plurality of rod elements horizontally disposed across the plurality of grid means. The rod elements extend substantially parallel to the molding surfaces and are laterally spaced with respect to each other between the molding surfaces.
A structural poured-in-place forming method of the invention comprises providing wall molding means including panel holding means for forming laterally spaced, opposed molding surfaces that define a wall mold cavity for forming a wall structure. The wall mold cavity has an upwardly directed top opening into which hardenable material is to be poured and hardened to produce the wall structure within the wall mold cavity. Then, vertically disposing first wall forming means to provide a first molding surface along one side of the wall mold cavity and providing reinforcement rod suspending means sufficiently rigid for freely positioning and retaining reinforcement rod means horizontally along the first molding surface. Attaching a first edge of the reinforcement rod suspending means to the first wall forming means to project outwardly from the first molding surface. Then freely positioning the reinforcement rod means to horizontally rest on the rod suspending means at a spaced distance from the first molding surface and at a plurality of preselected vertical locations spaced upwardly along the first molding surface. Then vertically disposing second wall forming means opposed to the first wall forming means to provide a second molding surface opposed to the first molding surface. And attaching the other outwardly projecting edge of the reinforcement rod suspending means to the second wall forming means for retaining the reinforcement rod means in place at the preselected horizontal and vertical locations while hardenable material is being poured into and is allowed to harden within the mold cavity.
In a specific embodiment, the first wall forming means includes a plurality of wall forming panels to provide the first molding surface, and the second wall forming means includes a plurality of wall forming panels to provide the second molding surface of a wall mold cavity. The wall forming panels are manually portable for removable and manual vertical disposition to form the wall mold cavity, and panel holding means independently maintains the first and second wall forming panels with respect to each other in the vertical disposition. The rod suspending means includes a plurality of grid elements that each extend upwardly along the vertically disposed molding surfaces and between the opposed molding surfaces. Each grid element includes a plurality of tie members that extend horizontally and are disposed at spaced preselected vertical locations with respect to each other. Rod locating means of each grid element maintains the reinforcement rod means at the vertical locations and spaced inwardly from each opposed molding surface while hardenable material is being poured into the wall mold cavity.
A poured-in-place forming process of the invention conducted at a building site produces a building including a molded monolithic structure consisting of floor and ceiling slabs, and inner and outer building walls that form a plurality of rooms defined by a building floor plan. The process comprises providing floor molding means for forming laterally spaced, opposed molding surfaces that define a slab mold cavity having an upwardly directed top slab mold opening into which hardenable material is to be poured and hardened within the slab mold cavity. Pouring hardenable material into the slab mold cavity and allowing it to harden and form a floor slab having a top surface, and upstanding inner and outer wall portions projecting upwardly from the floor slab top surface that define the inner and outer building walls according to the building floor plan. Then removing the floor molding means after the material has hardened to provide a cleared floor slab top surface and laterally spaced opposing sides of the upstanding wall portions in preparation for forming an upper portion of the monolithic building structure. Then providing upper building molding means forming laterally spaced, opposed molding surfaces that define an upper building mold cavity including a wall mold cavity having an upwardly directed top wall mold opening into which hardenable material is to be poured and hardened within the upper building mold cavity. Then vertically disposing internal and external forming panels having one end thereof resting on the floor slab top surface and juxtaposing the forming panels to the spaced laterally opposing sides of the upstanding inner and outer wall portions to define a wall structure having a layout according to the building floor plan. The internal forming panels being juxtaposed internal sides of the upstanding outer wall portion, and the external forming panels being juxtaposed external sides of the upstanding outer wall portions to define outer building walls of the wall structure. The internal panels for forming inner building wall mold segments and an inner wall portion of the outer building wall mold segments each having the same length to form an upper ceiling edge level defining a preselected ceiling height measured upwardly from the floor slab top surface inside each room of the building floor plan. Then horizontally disposing ceiling mold panels along the upper ceiling level of the internal forming panels of the inner and outer building wall mold segments to form an interior profile of the top wall mold opening. The external forming panels of the outer building wall mold segments form an exterior profile of the top wall mold opening and are sufficiently longer than the internal panels to form an upper edge on the exterior profile that extends above the height of the ceiling edge level of the interior profile of the top wall mold opening. Then pouring hardenable material into the upper building mold cavity to form a molded ceiling slab with a preselected thickness, and allowing it to harden and form the upper building portion of the monolithic structure and then removing the upper building molding means after the material has hardened.
A poured-in-place forming process of the invention includes vertically disposing first wall forming means to provide a first molding surface along one side of a wall mold cavity, and providing reinforcement rod suspending means sufficiently rigid for freely positioning and retaining reinforcement rod means horizontally along the first molding surface. Then attaching a first edge of the reinforcement rod suspending means to extend upwardly along the first wall forming means and to project outwardly from the first molding surface. And then freely positioning the reinforcement rod means to horizontally rest on the rod suspending means at a spaced horizontal distance from the first molding surface and at a plurality of preselected vertical locations spaced upwardly along the first molding surface. Then vertically disposing second wall forming means opposed to the first wall forming means to provide a second molding surface opposed to the first molding surface. And attaching the other outwardly projecting edge of the reinforcement rod suspending means to the second wall forming means for retaining the reinforcement rod means in place at the preselected horizontal and vertical locations while the hardenable material is being poured into and is allowed to harden within the mold cavity.
A fixed construction of the invention is poured-in-place at a building site and comprises monolithic concrete floor slab means including a floor upper surface and integrally formed upstanding wall portions projecting upwardly from the floor upper surface by an amount sufficient to form opposed lateral sides that are effective to laterally support contiguously disposed elongate wall forming panels that project upwardly from the floor upper surface for providing a wall mold cavity. The upstanding wall portions extend along the floor upper surface to define a wall structure having a layout of inner and outer walls for rooms of a building in accord with a preselected floor plan. The upstanding wall portions further include opposed laterally spaced sides that define a preselected wall thickness and that are effective to provide lateral support for panel means having molding surfaces that extend upwardly from the wall portions to form the wall mold cavity having an upwardly directed top wall mold opening into which hardenable concrete material is to be poured and hardened within the wall mold cavity.
A freestanding fixed construction of the invention is poured-in-place at a building site and comprises an enclosed monolithic concrete building structure including a floor slab having a top surface, and an upper building portion having a ceiling slab and a wall structure. The wall structure includes integrally formed upstanding inner and outer wall segments that project upwardly from the floor top surface. The ceiling slab is located at a preselected ceiling height measured from the top surface of the floor slab to the top of each wall segment. The wall structure extends along the floor top surface in a room layout of a building in accord with a preselected floor plan. The floor and ceiling slabs include horizontally disposed reinforcement rods that extend in at least one direction across the width of each slab. The upstanding wall segments include laterally spaced opposing wall surfaces and vertically disposed reinforcement rods that extend upwardly between the exterior wall surfaces and along the height of each inner and outer wall segment. A plurality of vertically disposed retaining means are horizontally spaced with respect to each other, and a plurality of reinforcement rod elements are horizontally disposed across the plurality of retaining means between the laterally spaced wall surfaces. Reinforcement rod elements extend in a direction that is substantially parallel to the wall surfaces, and are laterally spaced with respect to each other between the wall surfaces of the outer wall building segments.
In a specific embodiment, the horizontally disposed reinforcement rods within said floor and ceiling slabs extend in two horizontal directions that are perpendicular with respect to each other. The vertically disposed reinforcement rods in the inner and outer wall segments are coextensive with corresponding horizontally disposed reinforcement rods to produce a reinforcement rod cage structure disposed within the hardened floor slab, outer building wall structure, and ceiling slab. In addition, the horizontally disposed reinforcement rod elements in the outer wall building segments include at least two parallel elongate rod members each positioned horizontally at a spaced inward distance from opposed wall surfaces of the outer wall segments and at a spaced outward distance from a centerline located between those opposed wall surfaces of the outer wall segments.
Other objects of this invention will appear in the following description and appended claims, reference being made to the accompanying drawings forming a part of the specification wherein like reference characters designate corresponding parts in th several views.
The structural forming assembly, generally designated 10, of
Molding assembly 10 with its unique layout of upstanding slab wall portions 21, however, provides a means to quickly form laterally spaced, opposed molding surfaces that define an upper building mold cavity having an exterior wall profile 13 and an interior wall profile 17 of a wall and ceiling structure so that the entire building may be poured in a single operation. Molding assembly 10 includes panel holding means (not shown) that are used to vertically dispose and maintain laterally spaced wall forming molding surfaces juxtaposed the lateral opposing sides of wall portions 21. Such molding surfaces may thus be rapidly disposed manually along opposed sides of wall portions to accurately form the upper mold cavity for completing the building at the building site. Ceiling panels are supported on the top edge of panels 19 and panel support means at the desired ceiling height. Panels 19 provide internal molding surfaces of the outer building walls and the inner building walls. Ceiling panels 15 thus define the interior wall profile 17 and exterior wall panels 12 define the exterior wall profile 13. Upper building mold cavity 11 has an upwardly directed top opening as shown into which hardenable material is to be poured and hardened to produce the upper building structure.
In
In a specific embodiment, on the first day of construction, a slab molding assembly is erected to provide a slab molding cavity on a building site. Hardenable material such as concrete is then poured into the top opening of the slab mold cavity and allowed to harden and produce slab 20 with upstanding wall portions 21. Upper building molding assembly 11 is erected and poured the second day to produce the completed building. Molding assembly 11 is removed on the third day, and people are able to move into the building. For the first time, people who otherwise cannot afford to build and maintain more costly forms of construction are now able to own their own homes regardless of where they live.
The molding surfaces are spaced to form the mold cavity and produce the desired wall thickness that may vary from 2 to 10 inches and a ceiling thickness of from 4 to 8 inches. The height of the upstanding wall portions 21 may vary from 2 to 3 inches from the top surface of the floor slab, and the floor slab thickness will depend on the amount of upper building structure weight being supported and distributed across the building site area.
Each grid element 25 has a plurality of horizontal tie members 28 with at least the top and bottom members 28 having its outer end folded back upon itself to form a loop as shown. More of the tie members 28 may have loop ends if desired. Two pairs of grid elements 26 and 27 are attached to each of the tie members 28 along the entire length of each grid element 25, which are composed of metal that has a diameter and strength effective to be sufficiently rigid to project outwardly from one molding surface as shown. Reinforcement rods 24a-24f are then freely positioned by threading them through the rod locating pairs of grid elements 26 and 27 from one end of the mold cavity being formed. Elements 25 maintain the horizontally disposed rods suspended on the molding surface of panel 22 until panel 30 is in place as in
The poured-in-place forming process of the invention thus includes vertically disposing first wall forming panel 22 to provide a first molding surface along one side of a wall mold cavity. Then attaching a first edge of a plurality of reinforcement rod suspending elements 25 to extend upwardly along the first wall forming panel 22 and to project outwardly from the first molding surface. As is evident in the drawings and this disclosure, reinforcement suspending elements or grid elements 25 are separable from the assembly. Then freely positioning the reinforcement rods to horizontally rest on the rod suspending tie members 28 at a spaced horizontal distance from the first molding surface and at a plurality of preselected vertical locations spaced upwardly along the first molding surface. Then vertically disposing second wall forming panel 30 opposed to the first wall forming panel 22 to provide a second molding surface facing the first molding surface.
A fastening element 35 attaches each loop end projecting through panel holes 22a and 31 for retaining the reinforcement rods in place at the preselected horizontal and vertical locations while the hardenable material is being poured into and is allowed to harden within the mold cavity.
In a specific embodiment, a plurality of wall forming panels 40 as shown in
Concrete undergoes a hydration process. So the tighter the microscopic crystals of concrete, the stronger the concrete will be. Fewer shrinkage cracks from excess water will also result from a lower-range slump installation of concrete. The prior art teaches that it is important to use a good quality concrete and to make sure that a low slump is used when effecting a poured-in-place concrete operation. Slump refers to the amount of water originally mixed in with the concrete. The higher the slump number, the more water in the concrete with a 3.5 to 4.0 slump generally preferred. A slump of this range is said to allow for easy workability and, when properly cured, gives a higher strength than a slump of 4.0 and above. Quite unexpectedly, the process of this invention uses a slump 10 to 12 to achieve a very strong steel reinforced concrete having a smooth surface that may be finished as desired.
While the building construction system has been shown and described in detail, it is obvious that this invention is not to be considered as limited to the exact form disclosed, and that changes in detail and construction may be made therein within the scope of the invention without departing from the spirit thereof.
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