What is Cofferdams? | Types of Cofferdams
What is Cofferdams?
A cofferdam is a structure that retains water and allows a work area to be dewatered so that crews can pour concrete, excavate, repair, weld, and construct. Cofferdams are typically used for the construction of bridge piers and other support structures built within water
Cofferdams walls are usually made from sheet piles that are supported by internal braces, walers, and cross braces. Cofferdams are usually dismantled after permanent works are completed.
Since cofferdams are commonly constructed within the water, the sheet piles are installed using preconstructed templates that allow the correct positioning of each sheet pile from a barge.
Types of Cofferdams
There are many types, configurations, sizes, and material options when it comes to cofferdams. Below are a types of cofferdams examples:
- Box-Type cofferdams
- Cellular Cofferdams
- Single-walled sheet pile Cofferdams
- Braced Cofferdams
- Double-walled sheet pile cofferdams
- Earthen Cofferdams
- Portadam™ Systems Cofferdams
Cofferdams can be custom made to fit the specific needs of any type of project. Each of these cofferdam systems has its advantages and disadvantages, depending on conditions such as site location, site conditions, and construction cost available.