| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of part items, thickness and weight of floor plates, and facilitate the work execution at work site. SOLUTION: A passage 20 is formed of a floor unit 21, column materials 29, intermediate rails 30, and handrails 31. The floor unit 21 is formed of a pair of right and left main beams 22, a plurality of auxiliary beams 23 connecting the right and left main beams 22 to each other in lattice shape, floor plates 24 installed on these beams, and installed on support members 28. The main beams 22 and the auxiliary beams 23 are formed of aluminum alloy hollow extruded material, and the floor plates 24 are formed, similarly, of the aluminum alloy extruded material into a plate-shape.
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