To efficiently and easily perform work in view of time and labor heretofore required to work besides needing a large number of parts because of nailing stiffeners, rafters, or the like or fastening them with annealing wire for temporary fixing in order to make reinforcements immovable although it is extremely important to secure the covering thickness of concrete to maintain the quality of a building when building up the reinforcements and placing concrete.

The reinforcements and a form are immovably connected by the force of springs or the force of bolts using reinforcement supports to prevent unsteady motion of the reinforcements and to secure the covering thickness of concrete without requiring labor. Since no labor is required for the reinforcement supports, the reinforcements can be firmly fixed by using many reinforcement supports, and the number of spacers impeding the flow of ready mixed concrete put between the form and reinforcements can be reduced to decrease a possibility of forming rock pocket parts. The quality of the building can thereby be maintained.