Construction method of stairs and staircase, staircase support device, and staircase structure

摘要

PROBLEM TO BE SOLVED: To improve the safety and efficiency of operation by ensuring a working space on stairs by burying supporting columns for building the stairs into the wall of a stairhall in the construction of the stairs prior to a building frame. SOLUTION: Receiving beams 12 and temporary beams 17 are installed to supporting columns 10 erected in parallel on the floor side of a stairhall to be built, braces are mounted among both beams, and a supporting frame 14 is prepared. A supporting frame 15 having the same structure is constructed on the stair landing side opposed to the floor side, and a supportor 24 is manufactured. Steel-framed stairs 8 are installed temporarily among the receiving beams 12 of both supporting frames 14, 15. Scaffolding boards 28, 29 for operation are mounted temporarily among the temporary beams 17 and the steel- framed stairs 8, and used as working passages for building a building frame. The bar arrangement of the wall of the stairhall and forms are constructed in the same manner as conventional devices, concrete is placed and the supporting columns 10 are buried into the wall of the stairhall. When the scaffolding boards 28, 29 are removed, the temporary beams 17 are also taken off, and the stairs and the stairhall are built.