a watertight enclosure placed or constructed in waterlogged soil or under water and pumped dry so that construction or repairs can proceed under normal conditions.
2.
Nautical. a sealed void between two bulkheads, as for insulation or as an extra barrier to the escape of liquids or vapors.
Sheet piles pulled from south cofferdam are loaded onto barge.
The lowest contour line for each was the elevation of the top of the cofferdam.
Workers then go inside the cofferdam to prepare and construct the foundation.
The addition of impact attenuators, barriers or cofferdam type fender systems to redirect or lessen impact damage.
The specified fill material will be the same as that used for the cofferdam.
Construction of the guard rails and cofferdam ran concurrently.
It is often necessary to dewater from within a cofferdam to obtain a dry work area.
Once the pit is completely backfilled, the sheet-piling cofferdam will be removed.
Work is performed within a steel sheet piling cofferdam.
Driven sheet piles are used for shoring and cofferdam construction.
British Dictionary definitions for cofferdam
cofferdam
/ˈkɒfəˌdæm/
noun
1.
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
2.
(on a ship) a compartment separating two bulkheads or floors, as for insulation or to serve as a barrier against the escape of gas or oil