A watertight enclosure pumped dry to permit construction work below the waterline, as when building bridges or repairing a ship.
水下作业箱（用泵将水抽干的不透水空间，用于在水面下进行的作业，如造桥修船等），潜水箱
Example sentencesExamples
The construction scheme employed on the bridge consisted of cofferdams for the drilled shaft foundations, and climbing forms for the tower construction.
Its diversion tunnel is accompanied by upstream and downstream cofferdams that permit construction of the main dam.
Right outside my window is the cofferdam they're building so they can repair it.
The 1,050 mm diameter outfall on the west side of the airfield required a temporary cofferdam during its construction.
Definition of cofferdam in US English:
cofferdam
noun
A watertight enclosure pumped dry to permit construction work below the waterline, as when building bridges or repairing a ship.
水下作业箱（用泵将水抽干的不透水空间，用于在水面下进行的作业，如造桥修船等），潜水箱
Example sentencesExamples
Right outside my window is the cofferdam they're building so they can repair it.
The 1,050 mm diameter outfall on the west side of the airfield required a temporary cofferdam during its construction.
The construction scheme employed on the bridge consisted of cofferdams for the drilled shaft foundations, and climbing forms for the tower construction.
Its diversion tunnel is accompanied by upstream and downstream cofferdams that permit construction of the main dam.