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- Q205077 subject Q8360137.
- Q205077 subject Q8861680.
- Q205077 abstract "A cofferdam (also called a coffer) is a temporary enclosure built within, or in pairs across, a body of water and constructed to allow the enclosed area to be pumped out, creating a dry work environment for the major work to proceed. Enclosed coffers are commonly used for construction and repair of oil platforms, bridge piers and other support structures built within or over water. These cofferdams are usually welded steel structures, with components consisting of sheet piles, wales, and cross braces. Such structures are typically dismantled after the ultimate work is completed.For dam construction, two cofferdams are usually built, one upstream and one downstream of the proposed dam, after an alternative diversion tunnel or channel has been provided for the river flow to bypass the dam foundation area. These cofferdams are typically a conventional embankment dam of both earth- and rock-fill, but concrete or some sheet piling also may be used. Typically, upon completion of the dam and associated structures, the downstream coffer is removed and the upstream coffer is flooded as the diversion is closed and the reservoir begins to fill. Dependent upon the geography of a dam site, in some applications, a "U"-shaped cofferdam is used in the construction of one half of a dam. When complete, the cofferdam is removed and a similar one is created on the opposite side of the river for the construction of the dam's other half.The cofferdam is also used on occasion in the shipbuilding and ship repair industry, when it is not practical to put a ship in drydock for repair or alteration. An example of such an application is certain ship lengthening operations. In some cases a ship is actually cut in two while still in the water, and a new section of ship is floated in to lengthen the ship. Torch cutting of the hull is done inside a cofferdam attached directly to the hull of the ship; the cofferdam is then detached before the hull sections are floated apart. The cofferdam is later replaced while the hull sections are welded together again. As expensive as this may be to accomplish, use of a drydock may be even more expensive. See also caisson.A 100-ton open caisson that was lowered more than a mile to the sea floor in attempts to stop the flow of oil in the Deepwater Horizon oil spill has been called a cofferdam. It did not work, as methane hydrates froze in the upper levels preventing the containment.".
- Q205077 thumbnail Cofferdam_Olmsted_Locks_Ohio_River.jpg?width=300.
- Q205077 wikiPageExternalLink nautical.html.
- Q205077 wikiPageExternalLink cofferdam.php.
- Q205077 wikiPageWikiLink Q1076291.
- Q205077 wikiPageWikiLink Q11446.
- Q205077 wikiPageWikiLink Q12053830.
- Q205077 wikiPageWikiLink Q12323.
- Q205077 wikiPageWikiLink Q1242130.
- Q205077 wikiPageWikiLink Q208123.
- Q205077 wikiPageWikiLink Q3240570.
- Q205077 wikiPageWikiLink Q426745.
- Q205077 wikiPageWikiLink Q462174.
- Q205077 wikiPageWikiLink Q4735638.
- Q205077 wikiPageWikiLink Q629000.
- Q205077 wikiPageWikiLink Q689880.
- Q205077 wikiPageWikiLink Q811177.
- Q205077 wikiPageWikiLink Q8360137.
- Q205077 wikiPageWikiLink Q846451.
- Q205077 wikiPageWikiLink Q8861680.
- Q205077 type Thing.
- Q205077 comment "A cofferdam (also called a coffer) is a temporary enclosure built within, or in pairs across, a body of water and constructed to allow the enclosed area to be pumped out, creating a dry work environment for the major work to proceed. Enclosed coffers are commonly used for construction and repair of oil platforms, bridge piers and other support structures built within or over water.".
- Q205077 label "Cofferdam".
- Q205077 depiction Cofferdam_Olmsted_Locks_Ohio_River.jpg.