For most ports formed by manual excavation, the shallow water depth caused by back-silting is a major problem faced by most ports, and even some ports have sudden siltation under the action of cold waves, typhoons, and even strong waves To ensure navigable water depth of the navigation area and give full play to the location advantages, many ports in various countries and regions in the world are paying more and more attention to the development of dredging projects. At present, in the dredging project, the main types of ships include grabbing ships, trailing suction dredgers, cutter suction ships, etc. With the development and construction of Zhuhai’s port, the water area has gradually expanded, and the navigation depth of ships has also gradually increased. The scope of port water depth maintenance and the total amount of dredging projects have gradually increased. According to the absolute number, of the annual sediment return of Zhuhai’s port The amount of silt is very large, so it is imperative to use new technology models for dredging projects to break through the environmental impact of traditional maintenance dredging projects. This paper takes a dock in Zhuhai and its harbor basin channel as a prototype to conduct research on the application of the water depth maintenance dredging technology model to the maintenance dredging project.
Technical model of new environmental protection dredging equipment
Regardless of whether a hinged suction dredger or a trailing suction dredger is used, the core of the dredging work is the “centrifugal pump”. After completing the suction of a certain concentration of mud, it cannot be loaded and barged for export. In the dredging field, it is mainly used for sand taking and dredging. As a centralized point, it is impossible to effectively deal with the cohesive soil in Zhuhai Port, so a new water depth maintenance dredging technology model is proposed focusing on centrifugal pumps.
Application of water depth dynamic maintenance dredging technology mode
In the application of navigable underwater acoustic technology, in the reflection field of high-frequency detector equipment
On the surface, below the limit of the set density range, the value of the thickness of the pseudoplastic layer of floating mud is the safe navigable water depth of the ship. The low sand content and fluidity in the mud layer cannot achieve high dredging maintenance efficiency, but the bottom keel of the ship will not be damaged by contact with it, and the main operating skills of the ship will not be greatly affected, so it can be used The floating mud layer is mainly used as the water depth. At present, two types of methods, the gravity type instrument, and the navigable water depth measurement system are mainly used in the navigable water depth measurement work of the port area. higher water content. At present, 0.5~4.0m is used as the main navigable thickness of each port, combined with the above analysis of the floating mud layer in the port, finally, the port takes 0.5m and 1.0m as the navigable thickness of the entrance and internal waters respectively, and the minimum maintenance water depth at a tidal height determined by the above analysis is 0.9m, and it is finally determined that the water depth maintenance dredging project can be started when the water depth in the port area reaches 10.5m.
All in all, by maintaining the dredging water depth consistent with the actual situation of the dredging project in the port area
The technical model, applied in dredging projects, can achieve dynamic water depth maintenance effects, and effectively extend the dredging maintenance cycle in the port area, truly reduce dredging costs and reduce the amount of silt at the port entrance and inside the port area, and reduce the number of annual dredging maintenance. The overall effectiveness of dredging works.
Application of water depth maintenance dredging technology model in dredging engineering.
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