To improve workability by disposing a reinforcement bar and a step hard wares on a step back form set on the lower surface of a staircase, and fixing a riser member common to a form to the step hard wares.
A staircase form 24 comprises a step back form 5, a step hard wares 30 formed by bending a band steel like a staircase, a riser member 31 formed by a cement plate material or the like, and a support spacer 32. In construction, the form 5 is assembled, the spacer 32 is fitted, and a staircase reinforcement bar 7 is arranged on the form 5. Subsequently, pluarl hard wares 30 are arranged on the form 5 at spaces in the cross direction of the staircase, bounded by the spacer 32, and the riser member 31 is fixed to the hard wares 30. After an overflow stopping form is arranged at need, concrete is placed. Timely the overflow stopping form is removed, with the riser member 31 left behind, and after the tread is finished with a metallic iron, the form 5 is removed. Thus, a full size drawing is not needed, the staircase can be simply constructed by an unskilled carpenter, and as the riser member common to the form is used, the demolding work and finish work can be reduced remarkably.
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ISHIYAMA TETSUO
TAKADA TAKATSUGU
HORIO IZUMI
SHOWA DENKO KK