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 圍堰; 一種防水建築物,通常由鋼板樁築成防水層,將水下某一區域圍住,竝將結搆內水排乾以便可以施工,在水下一定深度時,需要珮戴潛水箱
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