| 摘要 |
PROBLEM TO BE SOLVED: To provide a tight frame capable of correctly screwing a tightening screw such as a tapping screw from a folded plate roof side by easily checking the position of the tight frame hidden below the folded plate roof. SOLUTION: A ridge part 2 corresponding to the folding shape of a folded plate roof is formed, the folded plate roof is placed so as to overlap the ridge part 2, and the folded plate roof is mounted by screwing a tightening screw to achieve the tightening while drilling a hole. A projecting or recessed marking part 7 is formed on a riser part 6 of the ridge part 2 so that the position of a tight frame hidden below the folded plate roof can be checked by a worker in screwing the tightening screw.
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