FIELD: production of concrete articles. SUBSTANCE: chamber cover has metal frame of Z-like cross section, arch-type body resting on it and it is made of rigidly interconnected thin-wall ribbed reinforced concrete slabs of box section. Located in hollows of slabs with air clearances are thermal insulation layers protected by waterproof layer. Lower surface of reinforced concrete slabs is provided with grooves having sharp ribs. EFFECT: high efficiency. 2 cl, 3 dwg
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SU1790497A3 |
