| 摘要 |
A weldless grating comprising: (a) a plurality of longitudinally extending primary load-bearing members having an upper portion, a lower portion and a web located between the upper portion and the lower portion, the primary load-bearing member having a plurality of spaced-apart openings in the web, the openings in each of the primary load-bearing members being aligned with the openings in adjacent primary load-bearing members; (b) a plurality of secondary load-bearing members having an upper edge and a lower edge, the secondary load-bearing members provided with first slots extending downwardly through the upper edge to provide top slots and with upwardly extending slots through the lower edge to provide bottom slots located substantially opposite the top slots, the secondary load-bearing members positioned in the aligned openings in the web of the primary load-bearing members, the top and bottom slots in the secondary load-bearing member forming a locking engagement with the web surrounding the openings in the primary load-bearing members, the secondary load-bearing members provided with secondary downwardly extending slots through the upper edge, secondary downwardly extending slots located between primary load-bearing members; (c) a plurality of tertiary load-bearing members positioned in the secondary slots in the secondary load-bearing members; and (d) a rod extending through the tertiary load-bearing members and the primary load-bearing members.
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