单词	cofferdam
释义	cofferdam /ˈkɒfədam / noun A watertight enclosure pumped dry to permit construction work below the waterline, as when building bridges or repairing a ship.Its diversion tunnel is accompanied by upstream and downstream cofferdams that permit construction of the main dam.... The construction scheme employed on the bridge consisted of cofferdams for the drilled shaft foundations, and climbing forms for the tower construction. The 1,050 mm diameter outfall on the west side of the airfield required a temporary cofferdam during its construction.
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