what is a dredge?
Dredge is defined as a device for dredging. The purpose is to collect the bottom sediment and transport them to other places.
Dredgers are divided into Hydraulic Dredgers and Mechanical Dredgers.
The main feature of all dredgers in this category is that the loose material rises from the in-situ state of the suspended state through the piping system connected to the centrifugal pump. It is cheaper, faster and safer than mechanical dredging.
Mechanical excavators work by mechanical excavation or collecting sediment from the bottom surface of a body of water, usually by using a bucket.
The dredging boat is divided into 4 types of dredging vessels:
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.
Cutter Suction Dredger：
A Cutter Suction Dredger is a stationary dredger which makes use of a cutter head to loosen the material to be dredged. It pumps the dredged material via a pipeline ashore or into barges. While dredging the cutter head describes arcs and is swung around the spud-pole powered by winches. The cutter head can be replaced by several kinds of suction heads for special purposes, such as environmental dredging.
Trailing Suction Hopper Dredger：
A trailing suction hopper dredger is self-loading/unloading and sometimes equipped with a pressurized discharging system.From the side of the ship one or two suction pipes descend to the bottom of the seabed. On the end of the pipe a so-called trailing drag head is connected. This head is comparable to a large vacuum cleaner and is trailed along the seabed.
The loop of the bucket-ladder dredger is powered causing the buckets to travel downwards in such a way as to scoop the material from the bottom, and then carry the material in the upright buckets up the ladder to the top. At the top the buckets rotate into an upside down position and their contents falls into a chute.
We will continue to describe what is a dredge? later.
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