What is the purpose of a cofferdam and foundation seal?

The purpose of a cofferdam and foundation seal is primarily to create a dry work area for construction activities, particularly in environments that are near water. When constructing or repairing bridge foundations, the presence of water can complicate the work, making it challenging to excavate and manage the foundation effectively. A cofferdam is a temporary structure built to hold back water and allow workers to access the site without flooding, ensuring that construction can proceed safely and efficiently.

Maintaining a dry work area is critical for various aspects of the project, including the stability of the foundation, the safety of the workers, and the integrity of the materials used in construction. This control over the working environment ensures better quality in the construction process and adherence to engineering specifications.

While concerns about bridge stability, construction time, and wildlife interference are important in broader project considerations, they do not encompass the chief function of a cofferdam and foundation seal, which is specifically aimed at managing the water conditions to facilitate work on foundations.