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caisson
(redirected from cofferdam)

    Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia 0.04 sec.

caisson

Hollow cylindrical or boxlike structure, usually of reinforced concrete, sunk into a riverbed to form the foundations of a bridge.

An open caisson is open at the top and at the bottom, where there is a wedge-shaped cutting edge. Material is excavated from inside, allowing the caisson to sink. A pneumatic caisson has a pressurized chamber at the bottom, in which workers carry out the excavation. The air pressure prevents the surrounding water entering; the workers enter and leave the chamber through an airlock, allowing for a suitable decompression period to prevent decompression sickness (the so-called bends).



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? Mentioned in ? References in periodicals archive
 
A cofferdam will be built to hold the water back and silt curtains will help prevent material from moving from one side of the lake to the other.
How to move a lake by Larmour, Adelle / Northern Ontario Business
Booms and oil skimmers were being used to contain the spill, which was mostly concentrated in one narrow arm of the lake, and three cofferdams were built to prevent any more oil from pouring into the lake, officials said.
OIL REMOVAL ENVIRONMENTAL DAMAGE TO LAKE APPEARS MINIMAL by Daily News (Los Angeles, CA)
Terms such as cribbing, cofferdam, and truss patterns are explained in small, focused drawings and then placed in context within the larger structures.
Jan Adkins Bridges: From My Side to Yours by Burns, Mary M. / The Horn Book Magazine
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