| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency of work from an inspection passage by enlarging the degree of freed on for installing the inspection passage under the roof. SOLUTION: An illuminating lamp L is provided in a recessed part 11C of a passage plate 11 for enabling a worker to pass for inspection at the back of a ceiling plate 1, and the passage plate 11 is suspended and installed from a beam 3 by handing members 12, 13 with the lower end part 11A of the passage plate 11 peeping through a cutout part 1A. The illuminating lamp L can be replaced from the treading surface 11B side of the passage plate 11 through an opening 11D. |
