International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage
5838. Chicago caisson, or Chicago well : A small coffer dam used in medium stiff clays, about 1.2 metres diameter, lined with planks added in 1.5 metres lengths and sunk to hard ground for pier foundations. The plank sheeting to the sides is held in place by steel rings wedged against the sides. | ||