Scoop Dredger, Sweep Dredger, Back Hoover

Category:

Operating Procedures

Dredge Plant

Description:

Scoop dredge - First used in 1993. Cutter suction dredge with no rotating parts. Produces little

turbidity or interference with debris. Well suited to removing thick layers of silty sediments. Not

effective when thin layers must be removed from shallow water.

Sweep dredger - Bilba and Vlaanderen XV. Both capable of dredging a thickness of between 20

and 60 cm (tolerance 5 cm). Can operate in depths as shallow as 1.5 to 2.0 m. Used in Brussels

Sea Canal in 1995 and at Brisbane Airport, Australia, and Dutch Port of Nieuwpoort. Sweep

dredge is a variation of scoop dredger.

Eco Drag - Mentioned but no detail

Back Hoover - Mini sweep dredger used on Cork Tunnel job. Submersible head with jets

mounted on backhoe. In June and August 1997 worked to 25 mm tolerance in silt. Back Hoover

produced 500 m3 per day in very thin layer of recently deposited material.

Potential application - Large and small projects involving removal of thin layers of polluted silt

with hydraulic dredges.

Reviewer:

C. Woolley

Company / Organization(s):

Chapter 5 Other Technologies Reviewed