Abstract: A panel for a concrete forming structure including two siderails and two end rails extending between and connecting the ends of the siderails. A corrugated, aluminum core member is located inside the area formed by the rails and substantially covers the interior space of the panel. An outer structural sheet extends between the two sets of rails and has the core member connected thereto. An inner plywood sheet extends between the two sets of rails and is attached thereto. The core member is also connected to the plywood sheet. Rigid insulating material fills the inner and outer troughs formed by the corrugated member. A tubular connecting member is provided to connect the afore-mentioned panel to an adjacent panel. It has two connecting flanges extending outwardly from one side and bolt receiving slots formed in each of these flanges. The tubular member has aligned holes therein for passage of a tie rod and special projections that form a channel to receive flanges provided on the edges of the panels.

Abstract: A panel connecting member for use with tie rods and panels for a concrete forming structure, which panels each have bolt holding structures along the edges thereof. This member is tubular and has two connecting flanges extending outwardly from one side. Slots to receive bolts are cut in the edges of these flanges. First and second aligned holes are provided in opposite sides of the tubular member for passage of a tie rod. Channel-forming, longitudinally extending projections are provided on the side of the tubular member opposite said one side. These projections are adapted to receive between them flanges provided on the edges of the panels. The preferred panel has a corrugated, aluminum core member substantially covering an interior space of the panel defined by two siderails and two end rails. Inner and outer structural sheets extend between these two sets of rails and are both connected to said core member.