| 摘要 |
PROBLEM TO BE SOLVED: To improve construction efficiency by absorbing an error on the manufacture or assembly of a wall column and a tread and facilitating the integral bonding of the wall columns and the tread. SOLUTION: Treads 2 are installed alternately onto both side faces of a wall column 1 while changing the directions, and female screw fittings 8 opened to the side faces of steps are buried to the treads 2 in a built-up stair, in which the upper step sections of one treads 2 and the lower step sections of the other treads 2 are joined by pace boards mounted at both end sections of the short face sides of the wall columns 1. Large diametral holes 9 are formed as being penetrated through the wall column 1 in the thickness direction while bolts 13 having an outside diameter D3 sufficiently smaller than the inside diameter D1 of the large diametral holes 9 inserted into the large diametral holes from the wall column 1 side are screwed to the female screw fittings 8, and the wall column 1 and the treads 2 are combined integrally. |
