The half PCa board and due to that the throb construction

摘要

PURPOSE:To apply prestress to a slab in the efficiency same as in the case of monolithic casting by a method wherein concrete is placed afterward to a half PCa board to which a cotter is formed with a prestressing steel being hooked in advance thereto, and tension is given to the prestressing steel after curing of the concrete. CONSTITUTION:To the end face of a half PCa board 1, a cotter 1a for hooking a prestressing steel is formed with its underside warped. Then the half PCa board 1 is placed over beams or beam molds with the prestressing steel 2 placed being hooked to the cotter 1a and cast-in-place concrete 3 is placed thereon afterward. After curing of the concrete, prestress is applied to a slab with tension given to the prestressing steel 2. Thereby the prestressing steel 2 can be placed with a big rise and strength of the slab can be increased therewith.