| 摘要 |
A metal floor grating comprises a number of parallel load carrying bars interconnected by a number of crossbars, the load carrying bars having an upper (in use) flange or flanges and the bars having a number of plain holes through which the crossbars extend, the crossbars being mechanically deformed betwen the load carrying bars to provide sections having at least one dimension greater than the corresponding dimension of the plain holes, and sections lying within the holes of greater length than the thickness of the load carrying members.
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