| 摘要 |
PURPOSE:To shorten work time at a job site, and enable installing construction work without relying on a technical expert when indoor stairs are installed so as to stride over a building upper floor unit and a building lower floor unit. CONSTITUTION:Indoor stairs 4 where a part to be arranged inside of a building first floor unit and a part to be arranged inside of a building second floor unit 2 are integrally formed, are housed inside of the building first floor unit, and an upper end part of the indoor stairs 4 is supported with the building first floor unit so as to be vertically rotatable, and a lower end part of the indoor stairs 4 is temporarily fixed. After the building second floor unit 2 housing the indoor stairs 4 is stacked on a building lower unit 1, temporary fixation of the lower end part of the indoor stairs 4 is released, and the indoor stairs 4 are downward rotated, and are moved up to a position to stride over the building second floor unit 2 and the building first floor unit, and the lower end part of the indoor stairs 4 is fixed to the indoor stairs installed on the building first floor unit. |
