• Cutter suction dredger of dredging characteristics

Cutter suction dredger is one of the most common and widely used hydraulic dredgers in recent years, which can complete dredging processes such as digging, conveying, discharging, and processing mud at one time, with continuous operation, high production efficiency, and low cost. It is not only suitable for mud conveying with short discharge distance (generally within 1.5km) but also suitable for dredging projects with more than the rated discharge distance. The cutter suction dredger excavates the working face to be smooth, the excavation slope depth is easy to control, the construction quality is good, but because the discharge pipe needs to be laid in the construction, the floating pipe on the surface has a certain influence on the navigation, in order to overcome this defect, the submersible pipe can be laid in the navigation area to reduce the influence on the navigation. Cutter-suction dredger soil type is suitable for mining dredging for the I~Ⅲ, easy to dig the soft earth, such as various types of sand, silt, loose, loose-plastic clay. The cutter suction dredger is mainly used for the dredging of large projects, and the smaller cutter suction dredger can also be used for the dredging of the small watershed with a narrow river surface. In recent years, with the increasing awareness of water environmental protection, the cutter suction dredger tends to be larger and more environmentally friendly.

  • Bucket-wheel dredger of dredging characteristics

Bucket-wheel dredger evolved from cutter suction dredger, it not only has cutter-suction dredger dug transport integration, continuous operation, the construction of good quality, high production efficiency, low-cost advantages, and further improve the ability to cut and digging of dredger, able to dig hard soil, and mining working face is smooth and good construction quality, but for thin layer desilting ability is poor. The bucket wheel dredger is greatly affected by the discharge distance. If it exceeds the rated discharge distance of the equipment, the relay pump should be added to significantly increase the cost. Floating tube has a certain effect on navigation, which can be reduced by using submerged tube technology. Rotary bucket dredger soil is suitable for the dredging category for Ⅱ~V, suitable for mining has a wide range of soil, such as all kinds of silt, clay, sand, and gravel, etc., this application, the river channel dredging project and a low-lying pond created land reclamation engineering.

  • Chain bucket dredger of dredging characteristics

Chain bucket dredger easy to adjust the depth of the groove, groove leveling. The use of mud barge to transport mud in construction does not affect the navigation of the river and is not restricted by the distance of mud discharge. However, there is much mud discharging equipment, complicated mud transporting process, the great mutual influence between digging, transporting, and unloading equipment, low production efficiency, and high cost. Ⅱ~Ⅲ dredger is mainly suitable for the soil category. Easy to dig silt, plastic clay, loose sand, dense sand, and loose gravel. When dredging fluid silt, the smaller the bulk density, the worse the effect, because easy to lose. The chain bucket dredger is suitable for long-distance transportation of soil or wide river surface.

  • Grab dredger of dredging characteristics

The grab dredger is characterized by a large excavation depth, up to 30 m or more. The grab can be removed, and can also be used as a crane to remove underwater obstacles; Self-propelled grab dredger with high maneuverability without the need of auxiliary vessels. The grab dredger uses mud transport, which is less affected by the transport distance and has little contradiction with navigation. However, the transportation of soil is carried by barge, and the mutual influence between digging, transporting, and unloading equipment is large, and the production efficiency is low. The grab dredger is difficult to control the excavation depth, the excavation face is uneven, the construction quality is poor, and the liquid silt is difficult to be removed. Grab dredger is mainly suitable for Ⅱ~Ⅳ soil mass category, in addition to the flow of silt, fit for all kinds of soil. Digging coarse sand and medium sand, grab efficiency is very good. Grab dredger is mainly used for small projects dredging, not suitable for large projects.

  • Bucket dredger of dredging characteristics

Bucket dredger not only has the advantages of being less affected by the transport distance, being flexible, and having little contradiction with navigation but also has a strong ability to dig hard soil. But like the grab dredger, the mutual influence between excavation, transportation, and unloading is large, the construction quality is poor, and the production efficiency is low. Mainly suitable for Ⅱ~Ⅵ soil category, in addition to the silt flow pattern is not applicable to the mining, the rest of the mixture of mud, sand, or soil can dig, such as silt, clay, sandy clay, rocky soil, pebble, sandstone, coarser particles, etc. Its digging ability is better than other kinds of dredgers and can be used to clean up cofferdams and obstacles underwater. Due to low production efficiency, it is rarely used for underwater removal of rocks, garbage, and other obstacle removal projects.