FIELD: civil engineering, concerns the floating method of erection of water- development works. SUBSTANCE: complex has base and a number of longitudinal and lateral cofferdams fencing off the water area in zone of construction, as well as means for changing water level of water area fenced off by these cofferdams; longitudinal and lateral cofferdams are made as pontoon dock-gates, each of them has casing with tank installed inside it for vertical movement relative the casing; pontoon dock-gates have means for conjugation to one another and to mechanisms for attachment and conjugation to complex base. EFFECT: enhanced capacity. 8 cl, 16 dwg
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