PURPOSE:To install the post half PCa forms of an upper stair accurately by adjusting the state of construction by a building adjusting bolt and a level adjusting bolt in the post half PCa forms in the periphery of reinforcing bars for the upper stair and connecting upper and lower post half PCa forms. CONSTITUTION:Deflection is prevented by a temporarily installed strut 2, a prefabricated girder reinforcing bar 1 is mounted, a slab half PCa board 7 is built, and the assembly work of forms required is conducted. Post half PCa forms 13 and wall PCa members 14 are assembled around reinforcing bars 12, which are pressure-welded and extended, for an upper stair. The upper and lower post half PCa forms 13 are connected while adjusting the state of construction of the level, etc. of the post half PCa forms 13 by building adjusting bolts 15 and level adjusting bolts 16. The post half PCa forms 13 are fixed to the assembling sections of the post half PCa forms 13 and the wall PCa members 14 while regulating the state of assembly by building-in adjusting bolts 17. Accordingly, the post half PCa forms of the upper stair can be installed accurately.
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