The cutter suction dredging is suitable for medium and large river dredging with large mud layer thickness and is suitable for excavating soft mud with fewer impurities and trash. Stranded suction dredging is an integrated construction process of digging, transporting, and blowing, using the fully enclosed pipeline to transport mud, no mud scattering or leakage will not affect the river navigation during dredging, construction is not affected by weather, and GPS and echo detectors are used for construction control to ensure construction accuracy. However, ordinary stranded suction dredging is easy to cause the spread of pollutants in the substrate due to the open excavation with spiral slicing reamer, and also more serious back siltation phenomenon will occur. It is easy to be affected by obstacles such as garbage and stones in the river, causing the clogging of the mud suction opening to occur. The sediment removal rate is generally around 70%.
However, with the development of dredging equipment technology, the use of environmental protection cutter suction dredgers for dredging has better solved the disadvantage of the spread of contaminants in the bottom mud. The environmental protection stranded suction dredger is equipped with a special environmental protection reamer head, which has the function of preventing the leakage and spread of polluted mud, and can dredge thin polluted mud with little disturbance to the mud, avoiding the spread of polluted mud and silt escape phenomenon, the rate of mud removal can reach more than 95%, the concentration of dredging is high, and the quality fraction of dredging mud is more than 70%. However, constrained by the structure of the environmental protection reamer head, it is more likely to be affected by the obstructions such as garbage and stones in the river, resulting in the clogging of the mud suction port, resulting in a lower dredging efficiency than the ordinary reamer.
