What does a suction dredger do?
A Suction Dredger is a stationary dredger used to mine for sand. The suction pipe is pushed vertically into a sand deposit. If necessary water jets help to bring the sand up. It is loaded into barges or pumped via pipeline directly to the reclamation area.
How does a dredging machine work?
A hydraulic dredge works by sucking a mixture of dredged material and water from the channel bottom. The amount of water sucked up with the material is controlled to make the best mixture. Too little water and the dredge will bog down; too much and the dredge won’t be efficient in its work.
How does a split hopper barge work?
Work method of Split-hull hopper dredgers A split-hull hopper is a dredging vessel whose hull is split in two halves and hinged at the deck so that the ship can open at its bottom to discharge a load of dredged material. The ship then closes to return to the dredging site and the process is repeated.
Why dredging is done?
Dredging is the removal of sediments and debris from the bottom of lakes, rivers, harbors, and other water bodies. Dredging is also performed to reduce the exposure of fish, wildlife, and people to contaminants and to prevent the spread of contaminants to other areas of the water body.
What is a hopper dredger boat?
The trailing suction hopper dredgers (TSHDs) of Boskalis are oceangoing vessels that can collect sand and silt from the seabed and transport it over large distances. The mixture of sand and water is pumped into the hopper of the dredging vessel. Excess water flows out through so-called overflows.
What is plain suction dredger?
The characteristic of a plain suction dredger is that it is a stationary dredger, consisting of a pontoon anchored by one or more wires and with at least one sand pump, that is connected to a suction pipe. The discharge of the dredged material can take place via a pipeline or via a barge-loading installation.
What is cutter suction dredger?
A cutter suction dredger cuts hard soil into fragments with a rotating cutter head. The material is sucked up by dredge pumps and discharged to a deposit area through pipelines across sea and land. During the dredging works, a spud is lowered in the seabed to secure the vessel. …
What is grab dredger?
A Grab Dredger is a stationary dredger, moored on anchors or on spud-poles. The dredging tool is a grab normally consisting of two half-shells operated by wires or (electro)-hydraulically. The grab can be mounted on a dragline or on a hydraulic excavator of the backhoe type.
What is a backhoe dredger?
A backhoe dredger is a type of mechanical dredging equipment. It consists of a hydraulic excavator mounted on a pontoon. It can be deployed on a wide variety of dredging projects. They are used to dredge ports and provide services to the offshore industry worldwide.
What is a cutter suction dredger?
A cutter suction dredger is a self-propelled or stationary vessel that uses a rotating cutter head to loosen the material in the hard ground (so-called cutting).