Abstract: An improved form construction enables wooden planks to be secured together with a novel clamp member when pouring various concrete structures. The novel clamp member has an L shaped body with the lower leg of the clamp member physically supporting the wooden plank while the upper leg of said clamp member is fastened to an already fixed retaining stake adjoining the clamp member. A pair of these clamp members can also be physically joined together in the present form construction to further position the supported plank members in a right angle orientation.