FIELD: civil engineering. SUBSTANCE: concrete form has frameworks with upper and lower lengthwise beams connected with diagonal struts and vertical stays. The frameworks are connected with crosswise struts. Lengthwise beams with plane floor are secured on upper lengthwise beams. The beams, struts and stays are made of C-shaped channels of steel sheet. Beam walls and horizontal shelves of the beams, struts, and stays are perforated through all the length. Relationships to define dimensions of the beams, struts and apertures are presented. EFFECT: simplicity in design, technological effectiveness. 3 cl, 5 dwg
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