Double Sheet Pile Wall Cofferdam Design

The design have been done using both an analytical calculation and a numerical model using plaxis 2d.

Double sheet pile wall cofferdam design.

They are double wall cofferdams comprising two parallel rows of sheet piles driven into the ground and connected together by a system of tie rods at one or more levels. The width between the parallel piles is empirically set as h 2 1 5m. The space between the walls is generally filled with granular material such as sand gravel or broken rock. Double walled cofferdam is provided in such situations.

Double wall sheet piling cofferdam. Subsection 704 steel sheet piling and cofferdams provide new or used continuous interlocking steel sheet piling including connections in corner pieces. A sketch of double wall cofferdam is given in fig 4. Double wall sheet piling coffer dams higher than 2 5m should be.

The width between the parallel piles is h 2 1 50 m. Sheet pile cofferdams are constructed on land for any under ground construction where workmen and adjacent structures must be protected against collapse of the excavation walls. They are cofferdams comprising two parallel rows of sheet piles driven into the ground and connected together by a system of tie rods at one or more levels. Double wall sheet pile cofferdam higher than 2 5 m should be strutted.

If the area to be excavated is relatively small in area or the wall to wall distance is reasonable internal cross bracing consist ing of wales and struts is practical. Double walled sheet pile cofferdams. Its installed on the seabed of the existing basin which consist of mainly soft clay. This type of cofferdam can be used in depth of water up to 12 m.

The space between the walls is generally filled with granular material such as sand gravel or broken rock. Design method of double row wall steel sheet pile cofferdam views. These dam consists of two straight parallel vertical walls of sheet piling tied to each other and the space between walls filled with soil. Sometimes an inside berm is provided to keep the pheratic surface within the berm.

Sometimes an inside berm provides to take the phreatic line. The double wall sheet pile cofferdam in aarhus habour is designed the cofferdam is part of the construction pit for the new media house in aarhus. This type of cofferdams if higher than 2 5 m should be strutted. The gap between walls is filled with soil.

Double walled sheet pile. Where h is height of water. Provide minimum nominal section modulus of at least 18 1 cubic inches per foot of wall when installed next to traffic or supporting traffic. A double wall sheet piling cofferdam comprises two straight parallel vertical walls of sheet piling tied to each other.

Its construction is essentially the same as that of a single walled cofferdam except that in place of one wall a pair of walls with a gap in between is used all along the boundary of the space to be enclosed.