Grab Dredger

A stationary mechanical dredger that excavates with a clamshell or orange-peel grab suspended from a crane on a pontoon, dropping the open grab, closing it on the seabed, and hoisting the load into an adjacent barge. It works on spud legs or mooring wires and suits soft to medium soils, deep excavation, and confined harbor corners where reach matters more than output. Grab sizes range from a few cubic meters to over 100 cubic meters on the largest crane units. It discharges to a flanking barge rather than into the dredger itself.