![]() Each bucket then returns empty on the underside of the chain to the bottom of the ladder where the cycle begins again. The material falls into drop chutes and into a barge moored alongside the dredger. This material is carried in the bucket to the top of the ladder where, at the highest point of the chain, the bucket overturns and the contents are offloaded. The dredging action starts when a bucket reaches the bottom of the ladder, where it loosens and scoops up a quantity of material. The propulsion machinery is used to move the vessel from site to site, but is not used in the extraction operation. A small proportion of the dredgers of this type are self-propelled. By rotating the bucket chain about flat-sided wheels (known as tumblers) at each end of the ladder, material can be loosened and transported. The ladder supports an endless chain of buckets, each of which is equipped with a cutting edge. ![]() The dredged material is loaded in barges.īucket ladder dredges usually comprise a rectangular pontoon with a central well in which a heavy steel frame or ladder is suspended. ![]() The buckets are turned upside down and empty moving over the tumbler at the top. It has an endless chain of buckets that fill while scraping over the bottom. The bucket dredger is one of the oldest types of dredging equipment. Bucket Dredger is a stationary dredger, fixed on anchors and moved while dredging along semi-arcs by winches.
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