Abstract: A fastening device to fasten at least two edge-to-edge contiguous panel facings includes a plurality of looped members projecting from the back face of each panel facing along the longitudinal sides thereof. Each looped member has an engagement face spaced parallely from the back face and two opposed angled flanks connected to the back face. Key members are to be inserted into the looped members, each having an insert rod portion and a handle rod portion which forms an angle with the insert rod portion, the insert rod portion having a pair of first opposed longitudinal faces, and a pair of second opposed longitudinal faces. The distance between the first opposed faces is smaller than the distance between the engagement face and the back face so that the insert rod portion can be inserted into two aligned looped members, and the distance between the second opposed faces is greater than the distance between the engagement face and the back face.

Abstract: A connecting element is provided for connecting together adjacent shuttering panels of the kind in which reinforcement strips with rows of holes provided therein are arranged at the edges of the shuttering panels and are dipsosed perpendicular thereto. The connecting element consists essentially of a curved lever arm (13) which tapers from a spigot part (17) to an end surface (18). The spigot part (17) adjoins a handle portion of the connecting element at a flange (16') defining an abutment edge (16). The handle portion is curved in essentially U-shaped manner and has a support surface (20) at the inside of its limb connected to the spigot portion (17). In operation the engagement end (18) of the lever arm is first introduced through two aligned holes in the adjacent reinforcement strips of two adjacent shuttering panels and the connecting element is then rotated about the abutment edge (16) so as to cause the spigot part (17) to enter into the two aligned bores.

Abstract: A formwork panel is formed from metal longitudinal members and metal transverse members interconnected by devices such as screws to form a dismountable formwork panel. The panels may be interconnected by other connector devices to form larger composite panels of various sizes and shapes. The panels may be formed from a kit of parts for easy assembly and disassembly at a construction site.

Abstract: A form assembly for cement or the like comprising interlocking form members. One form member is longitudinally straight and can be provided with horizontal stiffening ribs at its upper and lower edges. The other form member has upper and lower ledges at least one end and is resiliently flexible to permit bending into a longitudinally curved configuration. The ends of the form members are each cut away into complementary shapes to form an interlocking joint. The upper and lower horizontal ribs are provided with a first set of vertically aligned openings in the vicinity of the cut away joint and the upper and lower ledges are provided with a second set of vertically aligned openings in the vicinity of the cut away joint. The ribs and the ledges overlap each other so that the first and second set of aligned openings are in vertical alignment with each other when the cut away joints are interlocked, allowing a pin to be received by the aligned openings to fix the assembly into the ground.

Abstract: A formwork assembly for a poured concrete structure includes a plurality of formwork panels and girder-like members for supporting the panels. The panels comprise a concrete surface forming sheet and laterally spaced flange-like support members on the outside surface of the panel. The panel sheet is formed of an elastically deformable material so that the panel can follow the configuration of a curved surface of the concrete structure. The support members on the panels are notched or recessed at their ends so that the aligned support members on adjoining panels form a cutout to which the girder-like member is secured.

Abstract: A falsework for concrete structures is formed by providing tubular elements at longitudinal edges of metal planks and corner units and providing slots in these tubular elements such that hooks engaged in these slots can brace metal plates against two adjoining such elements while the metal plates are supported by bars welded to the elements below the slots.

Abstract: A reusable panel system for making concrete form structures, especially, after concrete is hardened, forms are dismantled and construction is finished, various patterns or designs will be left on the ceiling and beam, and these patterns or designs are uniform, smooth and delicate, therefore, they could save labor and material and make building have a nice appearance.

Abstract: A concrete wall form with an attachment inserted between extending abutting flanges of form panels to secure a workman's safety belt, the attachment being pivotally mounted and comprising an oval plate having two spaced circular holes.

Abstract: A safety key designed specifically for use in connection with concrete wall form panels of the "Steel-Ply" or metal-encased type. The key affords an anchor eyelet or hole for receiving the hook which invariably is provided on one end of a safety belt that is worn by a workman who is obliged to work on the concrete wall form at an extremely high or unsafe level or elevation. The key in one form of the invention embodies a shank and an enlarged head, the shank being received in the opposed notches which are formed in the outermost abutting ribs of the mating and abutting frame members or bars of the marginal reinforcing frames of two adjacent wall form panels, and being removably locked in place by a pair of conventional coacting wedge bolts. The enlarged head on the shank defines the aforementioned anchor eyelet or hole.

Abstract: A concrete wall form structure of the type having a pair of aligned contiguous pre-fabricated panel units disposed in an edged-edged, upstanding relationship. Each panel unit has one of its marginal frame members abutting an adjacent marginal frame member of the panel unit. The panel unit edges have a plurality of aligned apertures in each of the abutting frame members whereby at least two apertures of abutting frame members are aligned and receive an elongated bolt. One of the panel units slidably carries the bolt so that it is movable between a retracted rear position wherein the bolt is moved within the confines of that one panel unit and an advanced forward position wherein the forward end of the bolt is projected through both apertures of the adjacent frame members and within the confines of the other panel unit.

Abstract: A composite concrete wall form unit or assembly consisting of three metal-clad panels connected together in edge-to-edge relationship, the medial panel embodying a plywood facing with a rectangular metal-reinforcing or backing frame, such medial panel constituting a prefabricated fill-in panel for making up an odd dimension which exists between two adjacent outer panels. Such outer panels are of a larger size and likewise are prefabricated in such a manner that they possess a common plywood facing which extends across the plywood facing of the smaller medial panel in face-to-face relationship and thus bridges the odd dimension. A special and novel transition bolt is used for connecting each side rail of the reinforcing frame of the medial panel to the adjacent side rail of the adjacent outer panel.

Abstract: A concrete form which is particularly suited for casting-in-place concrete structures, such as a building, comprises a plurality of metallic form members that are interconnected so as to define a planar form surface having a plurality of spaced, parallel elongated depressions extending across the entire length of the form. The resulting concrete structure is generally planar having a relatively thin planar surface which is reinforced by unitary, spaced, parallel beams formed by said depressions. The resulting structure is of comparable strength to a thicker slab of concrete, requires less concrete, and provides spacing in-between the parallel beams for the ducting of utility lines. In a modification, the depressions may also include frangible mandrels which may be readily punched out of the concrete structure to enable the ducting of utility lines transverse to the beams of concrete.