| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a spiral stairway and a construction method of the spiral stairway very easily constructed, remarkably improving work efficiency and improvable in strength. SOLUTION: In this spiral stairway provided with step difference 2 around a post 1 to spirally provide stair plates 3, the stair plates 3 are provided in a projecting state at a large number of fitted bodies 4 fitted and fixed to the post 1, and each fitted body 4 with the stair plate 3 is fitted and fixed to the post 1 so that the projecting direction of the stair plate 3 is a specified direction.</p> |
