US 4,516,372 AGranted

Concrete formwork

OwnerGeorge A. Grutschinventor

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Abstract

Concrete formwork is provided comprised of a plurality of panels with backing plates tied together by tie wires or metal ties. In certain embodiments of this invention the panels are comprised of a material having a high insulating ability, but having relatively poor strength capabilities. Examples of these materials are polyurethane, polystyrene, and other foam plastics. The panels are arranged in a plurality of panel assemblies wherein each panel assembly includes a pair of panels spaced horizontally and tied together. The panel assemblies are arranged one on top of the other and end to end to form a complete wall. The panels have shiplap joint edges so that the joints between the panels interlock and are not in a single plane. The panels can be easily manufactured on the site by a plastic foam producing machine and a molding machine. The backing plates and metal ties or tie wires can be molded in place when the panels are molded. The backing plates are located on the exterior faces of each pair of panel sets and in some embodiments run the entire length of the panel. The tie wires and metal ties pass through the panels and attach to the backing plates.

Claims16

Dependent claims

Permanent formwork for forming a concrete wall, wherein said formwork becomes part of the finished wall, said formwork comprising:

a panel assembly including at least first and second panels,
said panels being spaced apart horizontally in a parallel relationship,
each of said panels having an interior and an exterior surface,
said panel assembly including means for stacking said panel assembly on another similar panel assembly,
first and second backing plates,
said first backing plate abutting the exterior surface of said first panel,
said second backing plate abutting the exterior surface of said second panel, and
said first and second backing plates lying entirely on the exteriors of said panels,
structural tieing means for tieing said first and second backing plates together, said tieing means being separate and distinct from said backing plates, said tieing means extending through the panels between and being connected to said first and second backing plates to restrain outward movement of said panels,
wherein a number of said panel assemblies are stacked end-to-end and vertically to form said formwork,
said tieing means of adjacent said panel assemblies being spaced apart when said panel assemblies are stacked,
wherein said panels are comprised of a moldable plastic foam material which is relatively soft and weak, as compared to the material of which said plates are composed, said panel assemblies being sufficiently strong so that a stack of said panel assemblies is self-supporting during the pouring of the concrete therein,
said panels, plates and tieing means comprising means for becoming a part of the finished wall.

10 more elements

Dependencies are inferred from the claim text.