| 摘要 |
PCT No. PCT/AU89/00303 Sec. 371 Date Feb. 14, 1991 Sec. 102(e) Date Feb. 14, 1991 PCT Filed Jul. 20, 1989 PCT Pub. No. WO90/01592 PCT Pub. Date Feb. 22, 1990.A space frame of double-layer flat grid type, in which the upper grid is skewed or angularly displaced by 45 DEG relative to the lower grid, has pairs of oblique struts (16) connecting the lower grid nodes (14) to the upper grid nodes (15). At a lower grid node (14) where two chords (10, 11) are superimposed, one pair of oblique struts (16) in a vertical plane through one chord (10) has a common terminal (17) between the two chords (10 and 11). A bolt (22) through the terminals (17) and the chords (10 and 11) secures the parts together. At the nodes (15) of the upper grid, the terminals (19) of the struts (16) are interposed between the superimposed upper grid chords (12 and 13) and secured by bolts (21). |
