Abstract: A supporting structure for modular building units comprising a pre-cast reinforced pre-insulated concrete slab. The supporting structure is a rectangular multi-bayed structural unit, suitable for use as a floor system or a roof, supported by composite pre-cast concrete beams integrated from the upper surface to the lower surface of the unit. At least a pair of pre-cast reinforced longitudinal beams run parallel to the length of the structure. Pre-cast reinforced composite crossbeams or purlins run in the transverse direction at regular intervals. The beams and purlins have integrated deformed reinforcing bar steel, and may include steel channel bottom reinforcement. An upper reinforcement of wire mesh is provided near the surface, welded to the reinforcing rods at intervals. The steel channel bottom reinforcement includes a plurality of spaced apart upright steel studs welded at regular intervals along the channel.

Abstract: A concrete wall panel for tilt-up construction provides polymeric peripheral elements defining panel and orifice edges and medial fastening strips extending in the panel between the peripheral elements, all of which remain as part of the finished panel to accept traditional self-penetrating nail, screw and staple fasteners historically used in wood construction. The peripheral elements are of solid configuration to provide a form for pouring plastic concrete that forms the panel embodying them. The fastening strips extend through the panel between opposed panel surfaces and are formed by two initially releasably interconnected elements defining voids therebetween to allow thickness adjustment and convenient placement and support of structural components within the panel. The fastening strips define spaced areas to receive traditional wood fasteners and may carry index strips on opposed exposed surfaces to visually indicate strip location and fastening areas.

Abstract: Disclosed is a lightweight, insulating panel building component comprised of a combination of a rigid insulation core in a composite structure with a plurality of structural materials, preferably steel. The steel members form a perimeter about the rigid insulation core providing structural strength, particularly taken in combination with the compressive strength of the core and the tensional and compressive strength of the structural members. These structural members include vertical members which provide support in compression, a cap member, a foot member, and optional external and interior facing. The cap and foot members are preferably in the form of a standard channel having a web dimension that is substantially similar to the thickness of the rigid insulation core and can fit thereabout at the periphery thereof.

Abstract: A prefabricated building panel for use in constructing a building structure includes a generally planar concrete panel, a metal member separate from the concrete panel and positioned on an end surface of the concrete panel so that the metal member is exposed for serving as a welding surface, and a plurality of bar anchors welded to the metal member and embedded in the concrete panel. The bar anchor is welded to the metal member to fix the metal member in place relative to the concrete panel. The metal member serves as a connection region for connecting the building panel to another building panel through welding.

Abstract: A crack inducer plate assembly for concrete structures having a volume and an outer surface includes an elongated and rigid core plate for extending in the volume at a location spaced from the surface, the core plate having opposite sides. A waterproof and resilient waterstop member is fixed to and covers the opposite sides of the core plate. Crossplates are welded to the core plate to anchor the core plate to reinforcing bars in the concrete. Cracks are formed in a controlled manner within the volume and by the waterstop member.

Abstract: An interstitial junction spacer for positioning and supporting a plurality of blocks in a matrix for a wall construction, the blocks being of the type having two parallel rectangular side faces and four adjoining end faces orthogonally adjoining the corresponding edges of the side faces and the ends of each other contiguously to form a continuous circumferential edge of the block, the profile of the circumferential edge being substantially concave, whereby the corresponding edges of the side faces define an outer cusp along the opposing sides of each said end face; said spacer comprising a pair of intersecting and integral spacer means, each spacer means having a pair of coplanar edge members of a prescribed thickness adapted to repose in juxtaposition with the outer cusps of the circumferential edge of a said block along the adjoining end of the end face of the block to space the same from another block or surface disposed adjacent to said block, and an interconnecting web portion to integrally interconnect

Abstract: A three-hour fireproof door (20) is made from a metal frame (26), a body (28), and a hinge (30). The body (28) is made from a concrete mix (40). The metal frame (26) is such that, when attached to a mold base (34), the body (28) may be cast in place. The concrete mix (40) contains an integral strengthening material (54) in the form of either a metal mesh (54) or an elastomer admixture (82).

Abstract: An earth stabilization structure and methods for making and using thereof are provided. The structure comprises a compressed annular tire wall stack unit encased in a reinforced matrix shell. The structure is preferably octagonal and cross-sectioned and preferably have a hollow core. The structure has welding elements for fixedly attaching adjacent structures together in the form of weld elements from any adjacent structures to be welded together. A stabilization wall is also provided by rigidly attaching a plurality obstructors together using the weld elements. The method involves providing a mold having a central pipe, compacting a plurality of tire sidewalls to provide a compacted annular tire wall stack unit (bundle), placing the bundle over the pipe, placing weld elements at the bottom of the mold, placing concrete in the mold, permitting the concrete to solidify, and removing the resultant structure from the mold.

Abstract: A lightweight structural concrete wall panel for house construction, includes a sandwich construction of two thin fiber reinforced concrete faces enclosing vertical panels of insulation material consisting of expanded polystyrene. Vertical structural concrete ribs between the insulation panels are used to interconnect the concrete faces. A continuous track system cast in the upper edge of the panel and projecting connect bars at the lower edge of the wall, connecting this wall to the surrounding structure in such a manner that the floor slab can be poured after erecting the walls. The face of the wall panel can be cast in such a manner as to appear as siding or another desirable building surface. Window and door openings can also be cast into this wall.

Abstract: An earthquake and severe weather resistant, fail-safe building block and construction method for fabricating the blocks and structures therefrom. The blocks are hollow and include at least two subassemblies joined by interconnecting webs with provisions for single subassemblies to square off wall edges. Each subassembly includes upper and lower frames joined together by a plurality of structural columns perpendicular to the planes of the upper and lower frames. The upper and lower frames are dimensioned to form interfitting male and female receptacles that permit the blocks to be interconnected so that an assembly of blocks with structural integrity may be created by snapping together courses of blocks with each course staggered relative to the adjacent course.

Abstract: A paving stone, in particular made of concrete, is utilized to produce a stable, highly water-permeable flooring. The paving stones are provided with two opposed side surfaces and two opposed end surfaces, each side and end surface having a trapezoidal recess formed therein; and further, each recess of each side surface is bordered by a bordering surface having an additional recess formed therein.

Abstract: A building system for wall construction utilizes a prefabricated panel having two layers of foamed insulating sheets sandwiched around a layer of concrete or other cementitious material. Channels are cut into an interior face of one of the panels. The channels receive cement, which provides a reinforcing structure when hardened. Steel vertical channel studs encase the sandwiched layers on two sides of the panel. The vertical channel studs have a vertical surface which is fastened to a similar, opposing vertical channel stud of an adjoining panel to effectively create a vertical I-beam support when the panels are assembled together. The panels of the invention can be readily transported to a worksite, assembled, and finished on-site with a stress-skin to yield a wall which is extremely rigid, insulative, and resistant to forces such as fire, water, termites, and impact.

Abstract: This invention refers to an improved modular system for housing based upon preformed reinforced concrete modules (ferro-cement). Different modules provide for fast and simple interconnection to form housing sets from interlinked sets of welded together modules.

Abstract: The present invention relates to a tilt-up concrete pad and the method or process for forming the tilt-up concrete pad and erecting a building comprised of a series of such tilt-up concrete pads. The precast concrete pad includes reinforcing rebar and embedded angled anchor plates that are secured to the embedded rebar and project therefrom where a portion of the angled anchor plates referred to as weld pads lie flush with the backside of the precast concrete pad. The respective precast concrete pads are placed around a foundation and are connected together by a series of connecting bars that are welded or secured on opposite ends to respective weld pads exposed on the back side of adjacently disposed concrete pads. The present disclosure also shows a work station used for pouring and manufacturing the concrete pads that form the present invention.

Abstract: A metal weldment and method of manufacturing the same in which the metal weldment is embedded in a concrete slab-type structural member. The weldment has a central plate having a planar, weldable surface along an edge of the concrete slab, the weldable surface is perpendicularly disposed to the horizontal plane of the concrete slab. There are a pair of outstanding arms extending from the weldable surface and which are embedded in the concrete slab. The outstanding arms have a constant height across their length and support a steel reinforcing mesh at a predetermined height during the concrete slab casting operation. A blockout is provided to the mold during the casting operation to keep the top edge and front surface of the weldable surface free and clear of concrete. This provides for thermal expansion of the weldable surface and minimizes cracking and spalling of the concrete during welding. The blockout is removed from the mold after the concrete has hardened and can be re-used.

Abstract: Horizontal panels, each consisting of top and bottom horizontal studs, with gypsum boards affixed therebetween, are stacked vertically, with suitable means for maintaining the wall vertical.

Abstract: A panel having several concrete layers and further including a sufficient number of elongated members disposed between the adjacent layers so that the brittle characteristics of the concrete panel are minimized. Inexpensive spacing material is provided to minimize the use of concrete, maintain the weight low and improve its handling characteristics. Utility conduits are provided built in as typically found in building structures as well as reinforcing bars as the architectural design requires. The panels are designed for their ready assembly on site.

Abstract: The invention relates to an insulating and structural masonry block comprising a sealed envelope of parallelepipic shape in which layers of light, dry aggregate are superposed, separated by a geotextile band placed in accordion like layers. Within the envelope is drawn a pressure lower than ambient pressure.

Abstract: A formwork for a draft tube which includes ganged precast forms, each precast form corresponding to a curved segment of the draft tube. The precast forms are molded with continuous side plates extending thereabout and anchored in the precast concrete form and projecting beyond the surface opposite to the contact surface to provide a flange. A fastening means for attaching adjacent forms with a space therebetween to allow for stripping. A method includes determining the outline of the inner surface of the draft tube and dividing it into segments and preparing molds to make precast forms corresponding to each segment. The precast forms are assembled and shored to provide the draft tube ganged formwork, and concrete is poured about the draft tube formwork and is cured. The precast forms are stripped from the set concrete structure and reused in another draft tube formwork.

Abstract: Apparatus for setting in position and securing, on the floor of a filter, members providing for fluid to flow through the floor. The apparatus consists of a support arranged so as to receive the member, such as a nozzle or equivalent, introduced inside a housing created in shuttering used for making the filter floor. The housing and the support are configured to removably secure mechanically, for example by a snap-in action, the support in its housing.

Abstract: A prefabricated modular building is constructed of a plurality of panels which are readily assembled and locked together without the need for tools (other than material handling and earth moving equipment) at the assembly site. The building is constructed of sets of panels, most of the panels in each set being identical.All of the vertical panels are interlocked by sliding a built in flange on each panel into a built in channel member on an adjacent panel. The vertical structural beams of each panel projects above and below the panels and these projecting ends are received by corresponding spaced receptacles in the horizontal ceiling and floor panels. In addition, an earth barricade on the roof of the building plus wall extensions provide for the covering of the roof and sides of the building with earth.

Abstract: Reinforced concrete wall components have top, bottom and side margins of a V-shape, and these margins have cooperative engagement with matching horizontal and vertical frame portions to provide a laterally stable support and connection between the wall components and frame portions. Eyes anchored in the concrete are spaced along the margins of wall components for use in lifting the wall components and for interconnecting them to horizontal and vertical frame components. Connection between the horizontal and vertical frame portions and to footings also comprises anchor projections and cooperating box-like connectors which receive the projections. Various arrangements of anchor projections are provided for connecting adjoining walls of a building.

Abstract: A plurality of walls are interconnected to form a hollow construction block including top and bottom contiguous block joining structure. The top contiguous block joining structure includes a first closed geometric shape adjacent to a second closed geometric shape. The first and second geometric shapes protrude above the side walls and have a width less than the width of the overall block and a combined length less than the length of the block. The bottom contiguous block joining structure includes a recess dimensioned to receive a joining structure dimensioned identically to the top contiguous block joining structure.

Abstract: A curtain wall building panel having a metal frame secured to the reverse side of a concrete panel with flexible anchors. A 3-D braid is formed in such a manner that non-metallic fibers are braided in the three directions at a pitch of 5 mm or more and have a self-supporting characteristic. The braid is embedded in the concrete panel and the front ends of the flexible anchors are secured to cell spaces in the 3-D braid. The curtain wall exhibits excellent bending strength, can be easily manufactured and can be used for exterior finish of multistory buildings. A method of making the building panel is also disclosed.

Abstract: Disclosed is a panel which includes a pan having at least one side member with an upper edge portion, the pan having contained therein a fluid based cementitious material pressed for removal of water while within the pan, and at least one trim member attached to the upper edge portion of the side member of the pan, the trim member undergoing telescoping action upon pressing of the material in the pan so as to be rigidly secured to the upper edge portion of the side member of the pan. Also disclosed is an apparatus and process for production of the pan.

Abstract: A one piece molded plastic sheet is glued to a floor surface and properly fastened. As many more molded sheets are added to the first in building a complete coverage over the surface. A loose grout material is placed over the molded sheet and into numerous shallow enclosures which consist of a network of raised ribbing that intersect to form a variety of shapes and patterns on the surface. The grout material is levelled off at the top of the raised ribbing so the rib top would appear to be the grout fill characteristic of conventional tile. As the tiles which were formed from the fill material is hardened it is bonded to the molded sheet by special entrapping designs in the mold that prohibit its release. The device serves to structurally support the subfloor by being bonded to the subfloor covering its surface with a strong plastic that supports the subfloors lateral movement.

Abstract: A composite metal-concrete column or beam is described for use in building construction. It comprises (a) a pair of channel members fabricated of galvanized steel sheet, each channel member having a central web portion and first and second flanges substantially perpendicular to the web portion, the free edges of the flanges forming narrow lips substantially perpendicular to the flanges and the web portion having openings through which wet concrete may freely pass, the channel members being positioned in back-to-back spaced relationship with the flanges projecting outwardly, (b) panel members extending across between the flanges of each the channel member and held within the narrow lips and (c) concrete filling the space between the panel members and extending through and around the web portions, whereby the cured concrete and channel members form a strong, composite structure.

Abstract: A structure for use as a wall, floor or roof comprising a plurality of panels with a pair of spaced apart elongated edges; each panel having front and back metal layers of substantially the same shape joined to an insulating concrete core of substantially uniform thickness; the panels being arranged edge-to-edge with an elongated metal member between the edges of two adjacent panels; and the edges of the panels being joined to the adjoining elongated metal member.

Abstract: An in-ground swimming pool is constructed of sectional panels joined by welding. The panels are formed of poured concrete having lateral ends of metal. Special configuration of internal reinforcing members prevents separation of the metal ends from the concrete body of the sectional panels.

Abstract: An environmental control dike system comprising a plurality of precast sections, each having a rectangular metal frame with a top and a bottom horizontal member, a first vertical end member joining the top and bottom horizontal members, the first vertical end member at a first end of the frame having an extension which extends longitudinally beyond the top and bottom horizontal members, the extension having a plurality of spaced openings adapted to receive the shank of a bolt, and a second vertical end member joining the top and bottom horizontal members at a second end of the frame, the second vertical end member having a plurality of threaded openings such that one of the sections may be secured to an adjacent section by passing a bolt through the openings in the longitudinal extension at the first end of the concrete section and threadedly engaging the bolt in the threaded opening at the second end of the adjacent section; a plurality of vertical reinforcing bars, one end of the vertical reinforcing bars b

Abstract: A connector arrangement for joining adjacent chord bar reinforcements in wall panels for prefabricated tilt-up concrete buildings. The chord bar connection is comprised of a plurality of chord bars welded to a steel plate cast into the concrete of a prefabricated wall. Adjacent walls are connected by bolts passing through the metal plates attached to the cast in concrete chord bars. The bolting arrangement allows free movement of adjacent panels during dimensional changes caused by temperature and moisture variations in the concrete.

Abstract: A side weld plate for joining adjacent concrete slabs together by welding. An elongated body is provided having a body section for embedment in a concrete slab and a flange section for positioning adjacent an edge of the concrete slab. The flange surface provides upon embedment of the body section in the concrete slab, an exposed weld surface which allows for adjacent concrete slabs also having a side weld plate to be welded together.

Abstract: Prefabricated architectural or decorative wall system having thin slabs of decorative materials, such as marble, granite, other natural stone or aggregates thereof, or other decorative exterior finish material, as an exterior finish bonded to the exterior of a thermally insulated structural panel. Such wall panels, including door and window openings are prefabricated at a plant location and assembled at the building site by use of internal fastening means. Each section or panel is itself a structural member and the system requires no frame or "superstructure" for support.The decorative exterior slabs are placed in rows or designs as aesthetics may dictate with adjoining edges spaced apart and those spaces filled with chemically modified concrete, grout or caulking to match material to be placed between adjoining panels on assembly.

Abstract: A turbine pedestal for supporting turbines and a generator installed in a generating plant is composed of a frame split into segments formed of concrete reinforcing steel platen and reinforced concrete as its main components. The turbine pedestal includes a deck of a concrete structure open only at the top and having reinforcements in addition to the platen arranged compactly in the vicinity of the top of the concrete as in a structure of the prior art, but less than the prior art in the vicinity of the sides and bottom due to the reinforcing affect of the platen. The segments of the frame formed of steel are prefabricated in the plant and have a shape and weight suitable for transportation to the site of construction. The segments of the frame are firmly connected together as by welding or interconnected through a concrete connection structure having compactly arranged reinforcements.

Abstract: A prefabricated building panel having a metal, load-bearing structure which may be filled with a hardenable material. The hardenable material need not have substantial load-bearing characteristics. A frame is formed from members of substantially C-shaped cross section with at least one vertical support placed across the central opening. Reinforcing bar, lifting means, electrical receptacle boxes and interconnecting conduit for the boxes may be installed as desired. A layer of insulating material is installed in the central opening at a transversely intermediate position. Further disclosed is a method of manufacturing said panels wherein a transversely extending lip is formed around both sides of the frame. The frame is placed on a horizontal surface and a hardenable material is poured into the frame to an intermediate level to form a first surface layer.

Abstract: A self-supporting composite plate for double floors or the like, comprising a pan-shaped wrapper for receiving therein a flowable and hardenable filler material of high compression resistance when in a hardened state, such as anhydrite or concrete. The pan-shaped wrapper comprises a plurality of downwardly extending burl-like projecting blocks containing the filler material. A base element of high tensile strength is connected to the projecting blocks.

Abstract: A building side wall construction including a plurality of expanded polystyrene panels placed edge-to-edge and connected by connecting studs each comprising a pair of C-shaped channels fastened in back-to-back relationship with each C-shaped channel being received in complementary mating relationship in grooves of the adjacent panels, and central reinforcing channels received in mating slots at central portions of the panels, with the opposite ends of the connecting studs and the central reinforcing studs being fastened to lower and upper channels in which they are received.

Abstract: In the Fibrestone Building Construction a thin fiber reinforced wall formed of sprayed concrete and short lengths of fibers, such as glass fibers, forms the outer shell of the wall exposed to atmosphere. An inner load supporting structure is secured to the inner surface of the outer shell. This load supporting structure consists for example of a metal frame aligned with the inner surface of the shell, and spaced metal studs. A differential of temperature exists between the outer surface of the fiber reinforced shell subjected to atmospheric temperatures and the inner load supporting structure because the inner members are shielded from atmospheric temperatures by the outer shell. The outer and inner members of the wall being formed of different materials have different coefficients of expansion when subjected to varying temperatures.

Abstract: A building panel is described which can be used for either walls or floors. It comprises a thin shell unit of reinforced, monolithic cementitious material having a large, planar outer face and an inner face interconnected by parallel end edges and parallel side edges. A plurality of stud members are partially embedded in the inner face of the cementitious shell, these stud members being parallel to each other, laterally spaced from each other and being fabricated of about 15 to 25 gauge galvanized steel sheet. This steel sheet material is shaped to provide a web portion with one longitudinal edge of the web being shaped to lock the stud within the concrete shell and the longitudinal edge of the web remote from the concrete shell comprising an L-shaped flange defining the outer surface of the stud member to which a finished panel may be attached. Channel-shaped metal beam members connect the ends of the studs.

Abstract: A panel for modular construction of building walls and the like which comprises a flat insulating core which includes a multiplicity of air-filled shell-like cavities in a staggered matrix of layered sheets which are separated from each other by a binding filler material. The core is surrounded and captured by a rigid rectangular frame having identical side members and identical end members which are contoured and oriented so as to engage the opposing side and end members of adjacent panels so as to align and fasten the panels to each other in assembly. Resilient sealing means are disposed between side and end rails of adjacent panels for forming an air-tight barrier across the assembled panels. The core is covered by facing layers of cement and gypsum construction for providing building exterior and interior wall surfaces respectively. A vapor barrier is sandwiched between layers of gypsum construction.

Abstract: Honeycomb floor panels for use in elevated floors or the like are disclosed. The honeycomb structure provides similar metal strips providing lateral cuts along one edge providing angulated tabs. The angulation of the tabs provides an angulated throat having a width substantially greater than the thickness of the strips so that the strips can be assembled in an interfitting relationship while the strips of the two arrays are angulated with respect to each other. After assembly, the arrays are moved to a substantially perpendicular position, and in such position a tight fitting relationship is achieved to eliminate looseness. Such honeycomb is provided, in accordance with one embodiment, with upper and lower metal sheets which are welded or otherwise fastened to the honeycomb itself. In such embodiment, an additional upper surface sheet is provided to prevent denting and to distribute concentrated loads to prevent crushing of the honeycomb. Sound deadening is provided between the two upper sheets.

Abstract: The panel assembly comprises an elongate panel preformed from mineral fibres having a density of not less than 180 kg/m.sup.3 and having two major faces and two longitudinal side edge faces, two elongate metal sections, each comprising a web engaging on one side thereof one of the side edge faces, a first flange at one longitudinal edge of the web and extending at right angles thereto from one side thereof, a second flange at the other longitudinal edge of the web and extending at an inclination thereto from the one side thereof and towards the first flange, and a channel in the web opening to the other side thereof for receiving a vapor seal.

Abstract: A construction element for constructing a supporting floor or the like consists of a slab made of reinforced concrete. The side walls of the slab are provided with protection profiles connected with each other. Two series of aligned, alternating projections and complementary recesses are lying above each other on each side wall of the slab, wherein the projections of one of the series are staggered with respect to the projections of the other series in such a manner that the recesses of one of the series lie above respectively below the projections of the other series. The projections of the lower series lie at a distance from the lower surface of the slab. As the construction elements forming a supporting floor are connected with each other by the interlocking projections and recesses of the adjacent side walls, the load of a construction element is distributed over the adjacent construction elements so that each construction element can take up a very high load.

Abstract: In the Fibrestone Building Construction the outer or exterior shell or panel is formed of a plastic material such as concrete reinforced by a high concentration of fibers, such as glass or other fibrous material randomly disbursed in the mass of the moldable material such as concrete. If desired the fibers can be chopped up to accelerate their bonding in the mass of the moldable material. This moldable material and the fibrous reinforcement may be sprayed under pressure into a mold having a surface which it is desired to reproduce. The surface of the mold is reproduced faithfully, and a relatively thin but strong outer shell embodying the desired contour is thus formed. This outer shell or wall is assembled in a horizontal position, with its outer face down, with a frame of substantially uniform thickness throughout. All necessary insulation, wall reinforcements, appliance fittings, door and window cutouts and spaces for wall connectors and utility outlets are installed within the thickness of the framework.

Abstract: A prefabricated monolithic reinforced concrete floor system is disclosed and claimed. Open web trusses are provided along a longitudinal dimension of a floor frame with rectangular tubular beams secured therebetween. Reinforcing elements are secured along upper surfaces of the open web trusses and the tubular beams where a floor is utilized and a reinforcing mesh material is draped thereover. Reinforcing clips may be received about the peripheral reinforcing elements to further reinforce edges of the floor. The concrete slab is produced in situ about the frame and totally encapsulates the reinforcing elements present while a lower surface of the slab is coterminous with an upper surface of the open web trusses and the tubular beams.

Abstract: A prefabricated load-bearing wall panel has a layer of concrete attached to a plurality of spaced apart parallel metal wall studs. The slab support is achieved by flexible bolsters secured at spaced locations to each stud and fastened to a reinforcing mesh embedded in the concrete slab. The bolsters, which are partially embedded in the slab, provide compressive and tensile support for the slab on the studs in a direction generally perpendicular to the general plane of the slab. In addition, the wall panel exhibits a synergistic effect in terms of composite design, wind load strength and shear strength.

Abstract: Disclosed is a generally rectangular prefabricated concrete panel having a pair of edge defining members along each lateral edge with a maximum distance at the upper and lower extents of the panel, but with a concrete body portion having substantially parallel lateral edges with a width less than the minimum distance between the edge defining members.

Abstract: A novel metallic reinforcing strip as described for use in cementitious construction elements. The reinforcing strip in one form comprises an elongated unitary strip having a substantially flat central web portion, with the side edges of the web merging by way of rounded corners of small radius into flange portions extending away from the central web. At least the free longitudinal edges of the flanges are inclined inwardly and these longitudinal flange edges have longitudinally spaced rounded depressions of small radius pressed downwardly therein. These depressions cause associated deformation of the flanges less than the full depth of the flanges, leaving substantially undeformed longitudinal portions of the flanges adjacent the central web and outwardly bowed portions of the flange edges between the rounded depressions. These contours provide a double curvature providing maximum membrane resistance within the reinforcing strip with minimum bending or flexing stresses.

Abstract: This invention discloses a core for a fire-resistant door with wooden stiles and rails forming the peripheral edge and a slab filling the space therebetween comprising a cured mixture of magnesium oxi-chloride with inclusions of fibreglass strands and perlite. Also disclosed is a method of making same in which the wooden stiles and rails form the sides of a mold and the core is formed by pouring a mixture on a flat surface with a non-adhering coating and curing the core in place so that it bonds to the stiles and rails.

Abstract: A compound beam, column or rod, consisting of a web (31) of timber or a wood-based board material or plastic material and of one or several flanges formed of sheet metal and affixed to the margin and bent around the web. The flange (32) has been affixed to the web by teeth or equivalent extending substantially through the web, and possibly using glue as aid. The teeth (33,34) bend when striking against the opposite flange metal sheet, producing a permanent joint. The teeth may also be affixed to the opposite flange by welding. A stress may be produced in the flange before it is joined to the web.