| 摘要 |
PROBLEM TO BE SOLVED: To improve the mounting rigidity of a hinge without increasing the thickness of a structural panel. SOLUTION: An emboss portion 19 is formed at a backward position corresponding to a hinge 2 on an upper flange 12, a plurality of bead portions 22 along the longitudinal direction from the emboss portion 19 to a frontward vertical wall 11 are arranged in parallel in the cross direction and a reinforcing plate 24 is interposed between the emboss portion 19 and a lower flange 13.
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