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cofferdam |
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cofferdam, temporary barrier for excluding water from an area that is normally submerged. Made commonly of wood, steel, or concrete sheet piling (see pile pile, post of timber, steel, or concrete used to support a structure. Vertical piles, or bearing piles, the most common form, are generally needed for the foundations of bridges, docks, piers, and buildings. Slender tree trunks, roughly trimmed and about 10 in. (25. ..... Click the link for more information. ), cofferdams are used in constructing the foundations of dams, bridges, and similar subaqueous structures and for temporary drydocks. If double sheeting is utilized, the space between the sheets is usually filled with clay and gravel. When great strain or pressure is likely to be encountered, as in deep water, the pneumatic caisson caisson (kā`sən, –sŏn) [Fr. ..... Click the link for more information. is preferred to the cofferdam. BibliographySee L. White and E. A. Prentis, Cofferdams (2d ed. 1956). cofferdamWatertight enclosure from which water is pumped to expose the bed of a body of water in order to permit the construction of a pier or other hydraulic work. Cofferdams are made by driving metal sheetpiling (a series of thin, interlocking panels) into the bed to form a watertight fence. Roman engineers used cofferdams to found the piers of their arch bridges and aqueducts. See also caisson. |
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? Mentioned in | ? References in periodicals archive | |
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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. 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. Terms such as cribbing, cofferdam, and truss patterns are explained in small, focused drawings and then placed in context within the larger structures. |
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cofferdam
