Table of Contents
Cofferdam Definition
A cofferdam is a temporary structure used to exclude water from a construction site or area being repaired, allowing work to be done on underwater foundations or other structures.
It is typically built using sheet piles or other barriers to create a watertight enclosure around the work area, and the water is then pumped out to allow access. When the work is completed, the cofferdam is dismantled and the area is allowed to fill with water again.
Construction Of Cofferdam
Cofferdams are special structures used to create a dry area for construction or repair work in areas that are normally underwater. They are commonly used for projects such as building dams, piers, and bridges. The main goal of a cofferdam is to keep water out as much as possible, so that construction can be safely carried out.
Cofferdams are usually made of steel sheets that are driven into the ground, and held in place with internal and cross braces. However, they can also be made of timber, concrete, or a combination of materials. The design of a cofferdam will depend on factors such as the depth of the water, the size of the construction area, and the conditions of the soil. It’s important to carefully design and build cofferdams, because if they fail, it can be dangerous.
Cofferdam Removal
After the work is completed, the cofferdam is usually removed.
The cofferdam removal process involves first removing the water that has accumulated inside the dam. This can be done using a pump or allowing water to flow through a valve or port. After that, the structure itself dismantles. This usually involves removing any piles or support rods, and then dismantling the dam walls or barriers. The materials used to construct the cofferdam can then be recycled or reused for other projects.
It is important to carefully plan the removal of the cofferdam to ensure worker safety and the stability of the surrounding environment. This process must be performed by experienced professionals who know the specific type of diaphragm to be removed and the techniques required to do so safely.