A trailing suction hopper dredger dredges loose material and soft soils such as sand, gravel, sludge or clay.
One or two suction pipes are lowered on the seabed and the drag head is trailed over the bottom.
A pump system sucks up a mixture of soil and water and discharges it in the ‘hopper’ or hold of the ship.
The fully loaded vessel sails to the unloading site, where the material is deposited on the seabed through bottom doors or reclaimed by using the rainbowing technique.
The material can also be pumped ashore through a pipeline, where it can be used for reclaiming land.
The material is sucked up by dredge pumps and discharged to a deposit area through pipelines across sea and land.
In some cases, split hopper barges moored alongside the cutter suction dredger transport the soil to the deposit area to unload it there.
While operating, cutter suction dredger are stationary dredgers.
During the dredging works, a spud is lowered in the seabed to secure the vessel.
As a result, it is kept on the same location, but by using winches and anchors, the dredger swings sideways and the cutter head cuts and removes the soil.
Many Jan De Nul cutter dredgers are self-propelled allowing them to move from location to location under their own power.
Links :
No comments:
Post a Comment