Dredging is the dredging, widening, or digging of deep rivers and lakes, and the use of human or machinery to carry out underwater earth and stone excavation. Dredging in the broad sense includes reef blasting and beach blasting by underwater blasting. Manual excavation is only suitable for small rivers that can be cut off. Various types of dredgers are widely used in mechanical construction, and onshore construction machinery such as cable shovels are sometimes used. Mechanical dredging started in 1600, and the prototype of the chain bucket dredger appeared in the construction of the port of Rotterdam in the Netherlands.
Dredging pipelines are steel pipelines mainly used for cleaning and transporting silt, mud and other mixed debris. Dredging steel pipe is widely used in beaches, rivers, waterways, urban environmental protection, engineering construction and other fields.
Dredging pipes are widely used: ① excavation of new waterways, ports and canals. ② Dredging, widening and clearing existing waterways and ports. ③ Dredging rivers, channels and reservoirs. ④ Excavation of foundation pits for hydraulic structures such as wharves, docks, and locks. ⑤ Combine reclamation, reclamation and reclamation. ⑥ Remove underwater obstacles.
Dredging machinery and equipment mainly include:
① Dredgers are divided into mechanical type and hydraulic type according to the working principle and earth material conveying method. Mechanical dredgers use buckets or shovel to directly dig and lift earth material from the water. There are chain bucket type, grab bucket type, bucket type and bucket wheel type. Hydraulic dredgers use high-pressure water to flush the mud or use a cutter or rake to cut the mud, and then use a mud pump to pump the mud, which is transported and discharged through a dredged steel pipe. It is also known as a suction dredger. , No cutter type, pneumatic type, etc. Dredgers are divided into self-propelled and non-self-propelled. Non-self-propelled requires tugs.
② Water-operated ships, such as survey ships, crane ships, drill and blast ships, anchor boats, etc.
③Auxiliary ships, including supply vessels such as tugboats, oil barges and freshwater barges, mud barges, barges and living ships.
④ Buoys, pipes and other ancillary equipment. When selecting dredging equipment, first select the main dredger, and then equip it with other auxiliary vessels to form a dredger fleet.