Gow caisson



  • A series of steel cylinders from 8'–16' high used to protect workers and equipment during deep excavation in soft earth. Each successive cylinder is 2' in diameter smaller than its predecessor, through which it is dropped or driven deeper into the surrounding soft clay or silt to prevent excessive loss of ground and to facilitate deep excavation. When excavation and construction are complete, the cylinders are withdrawn. See also Boston caisson, caisson pile.