| 摘要 |
PCT No. PCT/AU81/00089 Sec. 371 Date Feb. 1, 1982 Sec. 102(e) Date Feb. 1, 1982 PCT Filed Jul. 13, 1981 PCT Pub. No. WO82/00311 PCT Pub. Date Feb. 4, 1982.At each of the nodes (20) of a double-layer flat grid space frame, the longitudinal chord members (10,12) and the lateral chord members (11,13) of both the upper grid and the lower grid are in superimposed crossing arrangement, the ends (18) of the diagonal struts (14) which interconnect the nodes (20) of the upper and lower grids being interposed between longitudinal chord members (10,12) and lateral chord members (11,13), a connector member (19) being secured through the end (18) of each diagonal strut (14) extending from the node (20) and through the chord members above and below it.
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