The space between the walls is generally filled with granular material such as sand gravel or broken rock.
Double wall sheet pile cofferdam design.
The width between the parallel piles is h 2 1 50 m.
A double wall sheet piling cofferdam comprises two straight parallel vertical walls of sheet piling tied to each other.
198 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.
This consists of two straight parallel vertical wall of sheet piling tied to each other and the space between them filled with soil.
A sketch of double wall cofferdam is given in fig 4.
Double walled sheet pile cofferdams.
The values of earth pressure and its probable distribution against rigidly braced walls have been found to be at some variance with the pattern obtained by anchored yielding walls.
Double walled sheet pile.
Sometimes an inside berm is provided to keep the pheratic surface within the berm.
The gap between walls is filled with soil.
Sometimes an inside berm provides to take the phreatic line.
This type of cofferdams if higher than 2 5 m should be strutted.
Double wall sheet pile cofferdam higher than 2 5 m should be strutted.
Geotechnical design of sheet pile cofferdams.
The space between the walls is generally filled with granular material such as sand gravel or broken rock.