Abstract: A weldless grating comprising 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, generally rectangular-shaped 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. A plurality of secondary and tertiary load bearing members are provided.

Abstract: A lightweighted weldless grating comprising a plurality of substantially parallel, longitudinally extending primary load bearing members, a plurality of secondary load bearing members, and a pan member positioned between the primary load bearing members and supported on the flanges adapted to contain wet concrete, the pan member having a portion thereof extending upwardly against the lower edge of the secondary load bearing member to maintain the secondary load bearing members in web slots in the primary load bearing members, thereby forming the weldless grating.

Abstract: A weldless grating comprising primary, secondary tertiary members wherein top and bottom slots in the secondary load bearing member form a locking engagement with the web surrounding openings in the primary load bearing members, the secondary load bearing members having secondary downwardly extending slots through the upper edge, the slots having an upper portion extending downwardly from the upper edge and a lower portion located below the upper portion, the upper portion having a first extent and the lower portion having a second extent, the first extent being greater than the second extent.

Abstract: A weldless grating comprises a plurality of longitudinally extending primary load bearing members having an upper portion having an upper edge, a lower portion and a first web located between the upper portion and the lower portion, the primary load bearing member having a plurality of spaced-apart openings in the first web, the openings in each of the primary load bearing members being aligned with the openings in adjacent primary load bearing members, the openings having a top portion and a bottom portion, at least one of the top portion and the bottom portion having a protuberance extending from the first web into the opening, and a plurality of secondary load bearing members having an upper edge and a lower edge and a secondary web between the upper edge and lower edge, the secondary load bearing members provided with secondary slots in the secondary web.

Abstract: 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 said upper portion and said lower portion, the primary load bearing member having a plurality of spaced-apart openings in said web, the openings in each of said 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 said top slots, the secondary load bearing members positioned in the aligned openings in said web of the primary load bearing members, said top and bottom slots in said secondary load bearing member forming a locking engagement with said web surrounding said ope

Abstract: 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 t