Prefabricated forms for concrete walls

Claim 1

A concrete-wall formwork comprising a pair of side-walls each formed by a plurality of superposed panels (1, 2) having adjacent edges (8a, 8b), said panels being made of expanded plastic material, each panel having an inner face and an outer face, each panel (1, 2) being reinforced by horizontal stiffeners (4) having each a vertical and a horizontal wing defining a T-section, the vertical wings (4d) of the T being engaged within two vertical grooves (2a, 2d) formed in the edges of two adjacent panel elements whilst the horizontal wing (4a) of the T extends between the two edges (8a, 8b) and projects form the inner face of the two panels, said horizontal wing (4a) being provided with openings (4b), and rods (6) provided at the opposite ends thereof with hooks engaged in said openings (4b), said rods connecting the stiffeners (4) of both panels to each other and maintain said panels in spaced relation, and shores (5) external to the panels maintaining the two panels in a vertical position and in spaced relation, said shores (5) being removably attached to said stiffeners (4) of one (2) of the panels by means of hooks (7) which pass through said one panel and have an end portion (7a) anchored to the vertical wing (4d)of each stiffener (4).