If the crane is mounted on a barge, the entire vessel is referred to as a dredger. The crane could be located on the bank, or perhaps mounted on a barge.
Developing this idea further, a motorized crane equipped with a drag bucket or clamshell that is used to scoop material from the bottom of a body of water is also a dredger. cutter head breaks up material on the seabed before its removal by suction pipe.
For example, a scoop attached to the end of a rope or pole by which a man can draw sediments up from the bottom of a pond is a dredger. Marine dredging is an excavation activity carried out worldwide by many. A dredger is any device, machine, or vessel that is used to excavate and remove material from the bottom of a body of water. Dredging is also used as a technique for fishing for certain species of edible clams and crabs, see fishing dredge. It is also used as a way to replenish sand on some public beaches, where sand has been lost because of coastal erosion. This technique is often used to keep waterways navigable. (1901) Syndicate Dredging Company’s dredge at Folsom. (1901) The Preston and Oroville Dredging Company dredge, Oroville. Built by Golden State Miner’s Iron Works. Back in the day, however, they were the giants of the industry. Dredging Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location. Today, these massive multi-story mining machines are relatively rare.
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