Dredging arrangement comprising a biasing device
AssigneeIHC Holland IE B.V.
InventorsTimothy Alexander Van Opstal, Erwin Cornelis Johannes Bijvoet, Theodorus Adrianus Koning
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Abstract
The invention relates to a dredging arrangement for dredging material from an underwater bottom (6). The dredging arrangement comprises a drag head body (11) and a visor (12), the visor (12) being connected to the drag head body (11) and is moveable with respect to the drag head body (11) over a predetermined range. The biasing device (60) is provided in between the drag head body (11) and the visor (12) exerting a biasing force on the visor (12) over a biasing portion of the predetermined range, the biasing portion being at least 25% of the range.
Claims20
A dredging arrangement for dredging material from an underwater bottom, the dredging arrangement comprising a drag head body and a visor, the visor being connected to the drag head body and being moveable with respect to the drag head body over a predetermined range, wherein a biasing device is provided in between the drag head body and the visor exerting a biasing force on the visor over a biasing portion of the predetermined range, the biasing portion being at least 25% of the range, wherein the predetermined range is adjustable and defined by mechanical stops.
A method for dredging material from an underwater bottom using a dredging vessel comprising a dredging arrangement, the dredging arrangement comprising a drag head body and a visor, the visor being moveable with respect to the drag head body (11) over a predetermined range,
- wherein the method comprises
- adjusting the predetermined range through the use of mechanical stops;
- lowering the dredging arrangement to an underwater position with the drag head positioned on the underwater bottom,
- dredging by dragging the drag head over the underwater bottom in a dredging direction by means of a dredging vessel, and
- wherein the dredging arrangement comprises a biasing device provided in between the drag head body and the visor exerting a biasing force on the visor over a biasing portion of the predetermined range, wherein the method comprises
- adjusting the biasing device to set the biasing force being exerted.
(canceled)
Dependencies are inferred from the claim text.