FIELD: construction engineering. SUBSTANCE: spatial rarefied-structure roof slab has top and bottom equal-length ledges bent in longitudinal direction and built of strip members of top and bottom equal- section ledges within each ledge. Spatial rarefied structure of top and bottom ledges is formed due to the fact that any two adjacent strip members of one ledge are separated in slab ends by member of other ledge mounted between strip members. Strip members are joined at ends of spatial roof slab by means of lugs with holes that ensures jointing of strip members of top and bottom ledges in transversal direction of roof slab by driving through pin or bolts into holes and turning strip members relative to each other when moving apart top and bottom ledges in the course of slab manufacture. Intermediate members are mounted in span between top and bottom ledges. EFFECT: reduced material input; reduced cost and weight of roof. 4 dwg
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