Patent ID: 8671641

Claim:
A half precast slab for being used in half precast method in which concrete is deposited on the half precast slab to form a composite slab, said half precast slab comprising: a plurality of precast concrete members each of which includes a bottom part extending in a longitudinal direction, a pair of side walls provided upright on both edges of the bottom part, and the bottom part and the pair of side walls defining an upper space for receiving concrete surrounded by the bottom part and the pair of side walls, wherein the precast concrete members are arranged in parallel with each other in a direction perpendicular to the longitudinal direction and connected to each other, wherein the side walls of two adjacent precast concrete members are in contact with each other, and wherein each of the side walls, other than two outermost side walls on both edges of the connected precast concrete members, has a height less than the two outermost side walls so that the upper spaces of the connected precast concrete members are in communication with each other to form a single reinforcing bar arrangement space over the connected precast concrete members.