Where h is height of water.
Double wall sheet pile cofferdam.
The gap between walls is filled with soil.
The width between the parallel piles is empirically set as h 2 1 5m.
Double wall sheet pile cofferdam higher than 7 5 feet should be strutted.
The gap between the two rows of steel sheet piles is generally filled with granular material such as gravel or gravel.
This type of cofferdams if higher than 2 5 m should be strutted.
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.
The width between the parallel piles is h 2 1 50 m.
Double walled cofferdam is provided in such situations.
The space between the walls is generally filled with granular material such as sand gravel or broken rock.
This type of cofferdam can be used in depth of water up to 12 m.
Double walled cofferdams are those in which two parallel rows of steel sheet piles are connected with means of a track or a plurality of steel enclosed purlin brackets.
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.
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.