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What Is A Dredge Cutter?

What Is A Dredge Cutter?

A cutter refers back to the type of excavator head reminiscent of a basket cutterhead or bucketwheel on a hydraulic pipeline dredge. The cutter houses the suction intake and is used for slicing or agitating the materials which can be being dredged.

Cutters have primary functions:

Loosen and break up supplies from the bottom of a waterway into smaller fragments which are appropriate with the dredge’s pumping system.
Intro the crumbled debris into the high-velocity stream at the suction intake in a prescribed capacity where the materials might be then pumped and transported through a dredge’s hydraulic pipeline system.

Specialised types of dredger are normally of small size and output. They include simple jet-lift and air-lift, auger suction, pneumatic and amphibious dredgers.
Jet-lift dredgers use the Venturi effect of a concentrated high-speed stream of water to draw the adjacent water, collectively with bed materials, into a delivery pipe. The jet head has no moving parts so blockage by wires and other dock debris is minimised. These dredgers are comparatively small units and a few will be manoeuvred on spuds alone.
Air-lift dredgers are very similar to the jet-lift dredgers however the medium for inducing water and material flow is high pressure air injected on the mouth of the suction pipe. As with jet-lift dredgers there are no moving parts within the flow system. Hard or other difficult to loosen supplies can't be dredged.
Augur suction dredgers operate on the same rules as a cutter suction dredger, besides that the mechanical cutting tool is a rotating Archimedean screw positioned at proper angles to the suction pipe. The screw dislodges materials, which is fed to the centrally positioned suction pipe. Most units have a shroud over the reducing screw which reduces the spread of the plume of disturbed bed materials which normally escapes from all dredgers. The augur suction dredger advances into the slicing face by hauling itself alongside a wire deployed directly ahead. Very accurate horizontal and vertical dimensions could be achieved.
Pneumatic dredgers work on the ‘evacuator’ principle. A chamber with inlets for bed material is pumped out with the inlets closed. The inlets are then opened and water and material drawn in. The mixture is then pumped out and the cycle repeated. The unit is usually suspended from a crane on land or from a small pontoon or barge. The dredging motion is intermittent and suitable only for simply flowing material.
Amphibious dredgers have the unusual function of being able to work afloat or elevated away from the water surface on legs. They can be geared up with grabs, buckets or a shovel installation.
All the above specialist types of dredger (and others) have been developed for particular situations and customarily for small scale work reminiscent of slim canals, industrial lagoons and reservoirs. Some types have been developed to deal with contaminated sediments with minimal disturbance. They don't seem to be usually employed for big scale upkeep or capital dredging work.
A further type of dredger is the plough or bed leveller. This consists of a blade or bar which is pulled behind a suitable tug or work-boat. The strategy can be used for direct dredging over short distances and for levelling off the bed to the desired depth when a trailer or seize dredger is operating. It might even be used to tug away material situated close to quay partitions and different places the place a trailer cannot reach into a more accessible area. Typically the trailer itself operates the leveller if no tug or work-boat is available.

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