cofferdam
柯林斯词典
1. N a watertight structure, usually of sheet piling, that encloses an area under water, pumped dry to enable construction work to be carried out. Below a certain depth a caisson is required 围堰; 一种防水建筑物,通常由钢板桩筑成防水层,将水下某一区域围住,并将结构内水排干以便可以施工,在水下一定深度时,需要佩戴潜水箱
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