| 摘要 |
PURPOSE:To facilitate installation operation, to prevent fouling without curing treatment and to utilize an indoor wooden stair even as a temporary stair. CONSTITUTION:Tread grooves 2 at each stage extended from the upper end faces of a pair of side girders 1, 1 and riser grooves 3 are formed to the side girders 1, 1. Both ends are inserted into the tread grooves 2 and riser grooves 3 of the side girders 1 on both sides respectively, and backing treads 4 and risers 5 are formed. Decorative treads 6, which are arranged on the backing treads 4 while covering the top faces and front end faces of the backing treads 4 and in which both ends are inserted into the tread grooves 2, are mounted. Side girder covers 7 are installed along the top faces of the side girders 1. 1 The side girders 1, 1 on both sides are set up to a building body, insertion into the tread grooves 2 of the backing treads 4 and insertion into riser grooves 3 of the risers 5 are conducted repeatedly from the lower stage side to the upper stage side in succession. The indoor wooden stair is utilized as a temporary stair under the state, and the decorative treads 6 are inserted into the tread grooves 2. |
