Insulating formwork for casting a concrete wall

Claim 1

A concrete-wall formwork comprising: a pair of formwork sidewalls each formed of a plurality of stacked horizontal rows of coplanar panels; each panel being made of foamed plastic material and having flat inner and outer faces, upper and lower horizontal edges and vertical end edges, and including longitudinal coplanar slits extending lengthwise of said upper and lower edges parallel to said inner and outer faces, a first rabbit opening onto said inner face and onto said lower edge, and a tongue along one of said vertical end edges and a groove along the other vertical end edge, said tongue-and-groove being sized to cooperate, respectively, with a groove and a tongue of like adjoining coplanar panels to form tongue-and-groove joints therewith; said panels abutting one another along said horizontal and vertical edges; wherein ledges and second rabbets of adjoining panels operatively cooperate to form horizontal lap joints; wherein tongues and grooves of adjoining panels operatively cooperate to form vertical tongue-and-groove joints spaced horizontally along said formwork sidewalls; wherein longitudinal slits of adjoining panels comprise upward slits in coplanar alignment with downward slits; a first group of angle-irons having vertical branches, fitting into said upward slits, and horizontal branches with holes therethrough; said horizontal branches extending toward the inner faces of said panels; a second group of angle-irons having vertical branches, fitting into said downward slits, and horizontal branches with holes therethrough; said horizontal branches extending toward the inner faces of said panels; wherein said horizontal branches overlap one another with said holes in register; and tie-rods having a central portion located between said sidewalls and bent end portions extending through said registering holes and extending int the upper edges of said panels, and elbows between said portions fitting into said first rabbets.