| 摘要 |
PCT No. PCT/EP90/01706 Sec. 371 Date Jun. 13, 1991 Sec. 102(e) Date Jun. 13, 1991 PCT Filed Oct. 11, 1990 PCT Pub. No. WO91/05925 PCT Pub. Date May 2, 1991.The steel coffer is provided in the form of a box-like coffer element (1) of great load-bearing capacity, having a wall (2), flat per se, and a circumferential, multiply-folded edge section (3), which has stiffening sections (4) fastened underneath the coffer wall (2), has perforations (5) and connecting holes (6) in the circumferential edge section (3) and has, in the corners, notches (7) for folding the edge sections (3) and for insertion of the supports (8).
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