What is Coffer Dam?
A temporary Structure concstructed in a river, lack etc. for ecvluding water from a gicen site to enable the building operation to be performed on the dry surface, is called a coffer dam. It may be made of earth materials, timber or steel sheet piling or a combination thereof.
Some of the common types of coffer dams are as follows:
1) Cantilever sheet pile Coffer Dams
2) Braces Coffer Dam
3) Embankment Protected Coffer Dams
4) Double Wall Coffer Dams
5) Cellular Coffer Dam
The cantilever sheet pile coffer dams are suitable for small heights. The braces coffer dams are economical for small to moderate heights. There us no height limitation for embanking type coffer dams. The double wall coffer dams are suitable for moderate heights while the cellular coffer dams are suitable for moderate and large heights.