| 摘要 |
PROBLEM TO BE SOLVED: To secure the contact surfaces of upper and lower horizontal parts to a support post in a correct horizontal posture, and attempt positive fixture by making its side surface into an inverted C-shape, and also making the contact surfaces of upper and lower horizontal parts to be in contact with a support post into an arcuate surface having the same curvature as that of the outer circumferential surface of the support post. SOLUTION: With respect to a bracket 5, its contact surfaces 8 are pressed to the outer circumferential surface of a support post 1 in a manner that the contact surfaces 8 of horizontal parts 6 come close contact with the outer circumferential surface of the support post 1, and its perpendicular part 7 is caused to be in parallel with the central axis of the support post 1. Following this, the bracket 7 is welded to the support post 1; then two upper and lower attachment holes of the rib distal end of a step are matched to the attachment holes 9 of the bracket 5 to be tightened by nuts after passing bolts therethrough. In the next place, a step is held horizontally to subsequently be fixed to the support post 1. Thus, horizontal parts 6 to be formed on the bracket 5 are installed in its upper and lower parts, and its perpendicular part 7 is kept at the central axis of the support body 1 correctly in parallel, thereby intensifying its strength ably. As such, time during the fixation of the bracket 5 to the support post 1 is shortened, thus, improving workability. |
