FIELD: construction engineering. SUBSTANCE: structure that may be found useful in fabrication of roof slabs functioning as bearing and heat-insulating members for covering social and industrial buildings using collar-beam-free design scheme has composite gable box-section roof slab on discrete braces with ribs and reinforced by flat skeleton, and top ledge. Novelty is that ribs are joined to pre-stressed uniform-section slab by means of key-type discrete braces and items embedded in slab corners; inner space is filled with plate heater. EFFECT: reduced labor consumption. 2 dwg
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