Design Steel Sheet Pile Cofferdam

A cofferdam is a retaining structure usually temporary which is utilized to keep water or earth out of an excavation site until the permanent works are constructed.

Design steel sheet pile cofferdam.

88 single row steel sheet piles cofferdam is usually composed of steel sheet piles retaining wall internal support or pull anchor and so on. Used sheeting must be in good conditions. The sheet piles are then braced on the inside and the interior is dewatered. The main purpose of a cofferdam is to exclude soil and or water to form a safely supported excavation where construction works can progress.

Provide minimum nominal section modulus of at least 18 1 cubic inches per foot of wall when installed next to traffic or supporting traffic. En 1997 part 1 ec 7 1 for the geotechnical design and en 1993 part 5 ec 3 5 for the steel sheet piles and bearing piles. Between neighbors supports and at a defined depth to produce sufficient passive resistance. Such struc tures usually consist of vertical sheet piling walls forming a closed perimeter and braced internally or externally by a sys tem of structural members or ties.

Sheet piling is driven around the work site seal concrete is placed into the bottom to prevent water from seeping in from underneath the sheet piling and the water is pumped out. The latest eurocodes are based on a semi probabilistic approach. Design method of single row cofferdam of steel sheet piles views. A cofferdam is a substantially watertight enclosure consisting of steel sheet piling and structural bracing components which will permit substructure construction in waterways or other areas where the construction must be isolated from the surroundings.

They are formed from a single wall of sheet piles that is driven into the ground to form a box around the excavation. When construction must take place below the water level a cofferdam is built to give workers a dry work environment.