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Coffer Dams
A cofferdam is a temporary structure which is built to remove water from an area and make it possible to carry on the construction work under reasonably dry conditions. Coffer dams are usually required for projects such as dams, locks and construction of piers and abutments.
Requirement of a cofferdam:1. The cofferdam should be reasonably water-tight,
2. The design and layout of a cofferdam should be such that the total cost of construction, maintenance and pumping is minimum,
3. It should be sufficiently stable against bursting, over-turning and sliding, under the floods, waves and loads,
4. It should be generally constructed at the site of work, and
5. It should be so planned as to facilitate any dismantling and reuse of materials.
Types of Cofferdam:
1. Earth fill cofferdam,
2. Rock fill cofferdam,
3. Rock fill crib,
4. Single wall,
5. Double wall, and
6. Cellular cofferdam.
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