| 摘要 |
The lozenge-shaped trelliswork structures, common a number of decades ago, for hall roofs have weaknesses which have prevented their application on a wider scale. The use, according to the invention, of articulated joint fittings improves such structures with regard to the following points: 1) Trelliswork division and shape of the trelliswork and of the supporting surface can be selected in accordance with design and/or cost criteria. 2) Use is made of commercially available, straight-axis bars comprising round, rectangular, web-type or box-type profiles, or of latticework. 3) Transfer of stress resultants by the joint fittings always takes place in a systematic manner via the end-plate articulation bolts (7), even in the event of unforeseen, considerable deformations by unforeseen loads. 4) Mass production by standardisation of the joint fittings. 5) Full assembly of the individual trelliswork parts by the manufacturer. All that remains to be done on the building site is to position the lightweight structural part appropriately, to insert the suspension bolts (3) into the outer butt-straps (2+5), to tighten the articulation bolt in the joint axis (1), and to connect the spacer rod (12) with a turnbuckle (11) on the threaded end (10). 6) Fireproofing requirements can be easily satisfied in a cost-effective manner by suitable choice of bar material and trelliswork-division width. 7) Production and mounting are possible without extensive, special fitting-out, and widespread application is therefore obtained. <IMAGE>
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