This consists of two straight parallel vertical wall of sheet piling tied to each other and the space between them filled with soil.
Double wall sheet pile cofferdam.
Double wall sheet pile cofferdam higher than 7 5 feet should be strutted.
Where h is height of water.
This type of cofferdams if higher than 2 5 m should be strutted.
The width between the parallel piles is h 2 1 50 m.
Double wall sheet piling cofferdam these dam consists of two straight parallel vertical walls of sheet piling tied to each other and the space between walls filled with soil.
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.
The width between the parallel piles is empirically set as h 2 1 5m.
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.
A double wall sheet piling cofferdam comprises two straight parallel vertical walls of sheet piling tied to each other.
This type of cofferdam can be used in depth of water up to 12 m.
Double walled cofferdam is provided in such situations.
Double wall sheet piles this type of cofferdam is suitable when it is required to exclude water over 36 feet.
Double walled sheet pile cofferdams.
The gap between the two rows of steel sheet piles is generally filled with granular material such as gravel or gravel.