double-wall cofferdam

double-wall cofferdam

[¦dəb·əl ‚wȯl ′kȯf·ər‚dam]
(civil engineering)
A cofferdam consisting of two lines of steel piles tied to each other, and having the space between filled with sand.

double-wall cofferdam

A cofferdam formed by a double wall of sheeting (such as interlocking steel sections) and backfilled with soil or crushed stone.