Concrete forming structure having a double hinge filler

An inside articulated and collapsible concrete form for forming a rectangular corewall, said form comprising four form sides and four angle-shaped non-hinging corners arranged in quadrilateral relationship, each side including an outwardly disposed facing with a marginal reinforcing frame having side and end rails, a two-way hinge structure for each side disposed apart from each angle-shaped non-hinging corner, each of the two-way hinge structures being generally coextensive in length with said sides, the hinge structure including a series of hinge plates with a pair of the hinge plates attached to said sides, the hinge plates including a pair of spaced hinges joining said hinge plates in hinged assembly together and with the hinges lying in a plane common to the forming face of at least one of said sides and means for holding said sides in a predetermined position to facilitate the pouring of the concrete and with said means being releasable, said sides being pivotal on said hinges to effect disengagement of the sides from the poured concrete, the hinges being cooperable with the hinge plates and the sides to allow the sides to collapse and move relative to one another after release of said means for allowing the sides to be readily disengaged from the thus formed poured concrete.

An inside articulated and collapsible concrete form for forming a tunnel wall, said form comprising three form sides and two angle-shaped rigid non-hinging corners arranged in u-shaped relationship, each side including an outwardly disposed facing with a marginal reinforcing frame having side and end rails, a two-way hinge structure for each of said three form sides and being disposed apart from each corner, each of the two-way hinge structures being generally coextensive in length with said sides, the hinge structures each including a series of hinge plates with a pair of the hinge plates attached to said sides, the hinge plates including a pair of spaced hinges joining said hinge plates in hinged assembly together and with the hinges lying in a plane common to the forming face of at least one of said sides and means for holding said sides in a predetermined position to facilitate the pouring of the concrete and with said means being releasable, said sides being pivotal on said hinges to effect disengagement of the sides from the poured concrete, the hinges being cooperable with the hinge plates and the sides to allow the sides to collapse and move relative to one another after release of said means for allowing the sides to be readily disengaged from the thus formed poured concrete.