What does dredging mean

Dredging means removing silt or digging a deep channel to make the water flow smoothly: dredging a channel for traffic.

Pinyin: shū jùn.

Broadly speaking, dredging includes reef blowing, beach blowing, etc., carried out by underwater blasting. Artificially open and break the flow of construction of small rivers. Mechanical construction is widely used all kinds of dredgers, sometimes with rope shovels and other land-based construction machinery. Mechanical dredging began in the 1600s, in the Netherlands, Rotterdam harbor construction of chain bucket dredger prototype.

China in 1889 began in the Huangpu river with dredger construction. 1929 Jiangnan shipyard made chain bucket dredger. early 1980s, China has an annual dredging about 300 million cubic meters of mechanical dredging capacity.

Dredging is widely used in: ① excavation of new waterways, ports and canals. ② Deepening, widening and cleaning of existing waterways and harbors. ③ Dredging of rivers and canals and desilting of reservoirs. ④ Dredging of pits for hydraulic buildings such as wharves, docks and locks. ⑤ Combining dredging with land blowing and reclamation. ⑥Removal of underwater obstacles.

Purpose of the project:

The main purpose of the dredging project is to excavate the harbor pool, inlet channel, etc., blowing and reclaiming the land to build wharves, harbor area and port industrial area, coastal urban land and recreational land, shore and beach maintenance, water conservancy and flood control and siltation of reservoirs, improvement of the water environment of the rivers, lakes, and the sea and the restoration of the ecological environment, as well as the construction and filling of various types of submerged pipelines and ditches. construction and filling of ditches, etc. The role of dredging works on human social progress, environmental improvement and economic development is very significant.

With the dredging method, deepening the shallow section of the river or bay in order to improve the navigation or flood discharge capacity of the waterway; dredged soil from the excavation of the waterway or the harbor pool is blown into the nearby low-lying land to create a economically viable main method. Historically, dredged soil has been disposed of mainly by discarding or dumping it in the waters near the project.

Blowing project created a new way to turn waste into treasure, comprehensive utilization of treatment, and then developed into the use of dredged soil for construction materials and remediation of building materials and other uses. Dredging project also extends to the excavation of the river bottom or the seabed trenching to bury the river or cross-sea pipeline (water pipes, oil pipelines, power transmission cables, communication cables, etc.); digging out the underwater soft soil to replace the bearing capacity of the sand, stone for the foundation of hydraulic buildings; blowing the sand to maintain the beach and so on.

In the last twenty years, human environmental standards are increasingly demanding, to prevent and reduce the dredging activities on the waters and land pollution has become an important issue that must be considered by the dredging project, dredging methods to remove the underwater contaminated soil and engineering treatment has also become an important part of the dredging project.

It can be seen that the dredging project on the development of the national economy, especially for water transportation, water conservancy and flood control, industrial development and urban construction, the role of the maritime energy industry is very significant, is essential.