FIELD: civil engineering. SUBSTANCE: sectional joist with hollow webs and double wall is made of two bent profiles with the wall displaced toward webs. Bent profiles are interconnected by locking members in the form of bend on one end of webs of each profile and corrugations on inner side of opposite web of profile. Bend of one profile can be fixed in corrugation hollows of the other profile. EFFECT: easier manufacture from identical sections and wider field of application due to possibility of adjusting joist size. 3 cl, 5 dwg
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