Cofferdams is characterized as a temporary dam-like structure constructed around an excavation to exclude water.
A wall-like barrier composed of driven piling constructed to surround the area to be occupied by a structure and permit dewatering of the enclosure so that the excavation may be produced in open air.
Usually, cofferdams are dewatered so that the substructures can be built under dry conditions. After the substructures have been completed, the cofferdams are removed.
Ref: 123200/2006-09-19
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