| 摘要 |
The supporting structure consists of a series of inverted trough-section metal profiles (2, 3) of different heights but constant cross-section mounted on a girder infrastructure (1). The profiles have stiffening ribs (22, 32; 24, 34) in the form of U- or V-section grooves along their tops (21) and sides (23), and their bases (25) also have stiffened edges (26). The ends of the profiles have holes for fixing bolts.
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