Cofferdam



What is a Cofferdam


“A cofferdam is a temporary structure designed to keep water and/or soil out of the excavation in which a bridge pier or other structure is built.”


Braced Cofferdams


Formed from a single wall of sheet piling
Drive into the ground to form a box around the excavation site
The “box” is then braced on the inside
Interior is dewatering
Primarily used for bridge piers in shallow water.


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