Composite dumbbell-shaped double-wall steel cofferdam

The utility model provides a composite dumbbell-shaped double-wall steel cofferdam which comprises an outer wall plate, an inner wall plate, a bottom compartment, an inner support, bottom sealing concrete, a floating assisting system, a first platform, a second platform and blade feet, a plurality of block units are spliced to form double arcs, and the middle of each block unit is welded to form adumbbell-shaped structure in a closed unit connection mode. The steel plate truss floating assisting system increases the draught depth of the cofferdam and assists the launching air bag, and safe launching of the cofferdam is facilitated. The double-wall steel cofferdam has the advantages of being easy and convenient to install, high in structural stability and strength, safe in launching, highin impact resistance and the like, and is suitable for dumbbell-shaped double-wall steel cofferdam construction in a complex rock stratum water area. 本实用新型提供一种复合式哑铃型双壁钢围堰，包括外壁板、内壁板、底隔舱、内支撑、封底混凝土、助浮系统、第一平台、第二平台以及刃脚,若干分块单元拼装形成双圆