| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the accuracy of products, and to improve the efficiency in the manufacture by bonding side plates with bolts to be screwed to screw holes without requiring the welding, and preventing the deflection of the side plates in a passage unit for forming a passage or a landing of steel framed stairs by pinching with side plates and open strings. SOLUTION: A lower vertical plate 6 forming a lower plate 1 is formed with a projecting bar 11, and a high nut 23 is fixed to a groove 9 (a). A reinforcing vertical plate 12 having an upper and a lower horizontal ribs 13 and 14 is fixed to an outside surface 6b of the lower vertical plate 6. An upper horizontal plate 19 is fixed to the top surface of a lower horizontal plate 3 forming the lower plate 1. The upper horizontal plate 19 is formed with a projecting bar 17 at the top surface side, and the high nut 23 is fixed to a groove part 15 (a). A passage unit 30 is thereby formed (b). A part of the lower vertical plate 6 near the upper end thereof is formed into a connection part 27, and a lower surface of the upper horizontal plate 19 at the other end 21 side is formed into a connection part 28, and these connection parts 27 and 28 are overlapped with each other so as to connect the passage units 30 to each other by a required length for use.</p> |
