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The characteristic of a cutter suction dredger

April 15th 2010 02:31

Your text goes here The characteristic of a cutter suction dredger is that it is a stationary dredger which is equipped with a digging tool, the cutterhead or cutter, to the soil cut soil before sucking it up. During the suction process the dredger follows an arc centred on a spud pole by means of side winches that are fastened by cables to the side anchors (Figure 3-3). A cutter suction dredger can easily be distinguished from a suction dredger because the latter has no spud poles (although there are also some cutter suction dredgers that do work on cables).
The ladder, the construction upon which the cutterhead and drive and the suction pipe are mounted, is suspended in the ladder gantry. In small and medium cutter suction dredgers this is often an A-frame while in large cutter suction dredgers it is a heavier gantry. The pontoon of a cutter suction dredger is usually also a heavier construction than a stationary suction dredger because part of the cutting force is /carried away/taken up/absorbed by the pontoon and the spud poles. The dredged material is transported to the disposal site via a hydraulic pipeline. There are, however, some cutter suction dredgers, which are equipped with a barge loading system. In such cases the cutter suction dredger has one or more pumps, one of which may be mounted on the ladder. The propulsion units of self-propelled cutter suction dredgers may be mounted either on *the end of the dredger close to the cutterhead or on the end closer to the spuds.

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the history of cutter suction dredger

April 15th 2010 02:26

Your text goes here Cutter suction dredgers originated in the United States . In 1884 a cutter suction dredger was used in the port of Oakland, California. This dredger had a cylindrical cutterhead and was used to dredge layers of sandstone. It had a pipeline of 500 mm diameter and a pump with an impeller of 1.8 m! The disadvantage of this design was that the suction mouth was frequently blocked. At the end of the 19th century and beginning of the 20th century there was a major development in suction dredgers [T3]
For example, in 1896 the cutter suction dredger “Beta” was built for the American Dredging Company of Chicago. This dredger, with a draught of 1.95 m and a beam of 12 m, was the biggest cutter suction dredger of its time. The “Beta” had two independent pumps with 850 mm diameter suction pipes. Each suction pipe was split into three pipes of 500 mm diameter. On each of these suction pipes was a vertically mounted suction head with a diameter of 1500 mm. The suction heads had a speed of 12 revolutions per minute (Figure 3-2).
After this dredger had been used on the Mississippi River for two years, the cutterheads were replaced by jets, a procedure which at that time was more often carried out in during the design of the cutter suction dredger. The cutter suction dredger became the workhorse of the dredging industry in America , as did the bucket dredger in Europe at that time.

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cutter suction dredger

April 15th 2010 02:16

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Areas of application
Cutter suction dredgers are largely used in the dredging of harbours and fairways and for land fill projects. In such cases the distance between the dredging and disposal areas is usually smaller than the distances bridged by trailing suction hopper dredgers. When an accurate profile is required, the cutter suction dredger also has the advantage.
The cutter suction dredger can tackle almost all types of soil, although of course this depends on the installed cutting power. Cutter suction dredgers are built in a wide range of types and sizes, the cutting head power ranges between 20 kW for the smallest to around 4,000 kW for the largest. The dredging depth is usually limited; the biggest suction dredger can reach depths between 25 and 30 m. The minimum dredging depth is usually determined by the draught of the pontoon.
The cutter suction dredger is one of the stationary dredgers. It has at least two side anchors that are necessary for the dredging process. Because of these anchors they may obstruct shipping movements. Some of the larger cutter suction dredgers are equipped with a propulsion system which assist during *’breaking up’; thus aiding the departure from the dredging area, while furthermore they can also move under their own power from work to work.
The small to medium sized cutter suction dredgers can be supplied in a demountable form. This makes them suitable for transport by road to inland sites which are not accessible by water, for example to lay a sand foundation for a road or to dredge sand and gravel for the building industry.
Even if equipped with swell compensators, when working in open water with waves or swell cutter suction dredgers clearly have more limitations than trailing suction hopper dredgers

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