Historically, the Xiaoqing River was black and stinky. One of the key reasons was long-term silting, which led to decay and pollution of the bottom mud, which produced a series of ecological chain reactions, and the Xiaoqing River was no longer clear. The key link of “bottom dredging” of the Xiaoqing River re-navigation project not only deepened and widened the channel, but also helped the Xiaoqing River clean up the “gut” and dig out silt.
the excavation face of the cutter suction dredger is flat, and the excavation slope depth is easy to control , good construction quality. The disadvantage is that pipelines need to be laid to discharge the mud, which has a certain impact on the navigation of the river; moreover, the self-navigation ability is poor, the excavation depth is limited, and it is more sensitive to water flow and waves. The phenomenon of sediment diffusion during the construction process needs to be protected by setting a protective cover. Controlled cutter suction dredgers are more suitable for digging non-cohesive soft soils, such as various types of silt, loose sand, loose plastic clay, and can be used in various dredging projects.
Cutter suction dredger is the most common and widely used dredger for river bottom dredging in recent years. It adopts the method of anchoring on the water, uses the reamer to rotate and cut the bottom mud, and the mud-water mixture formed is passed through the suction dredger. The pump sucks the mud into the mud discharge pipe, and then transports it through the pipeline to the mud discharge point. Its advantage is that it can complete the dredging process such as excavation, transportation, discharge and treatment of mud at one time, continuous operation, high production efficiency, low cost, and the excavation face of the cutter suction dredger is flat, and the excavation slope depth is easy to control , good construction quality. The disadvantage is that pipelines need to be laid to discharge the mud, which has a certain impact on the navigation of the river; moreover, the self-navigation ability is poor, the excavation depth is limited, and it is more sensitive to water flow and waves. The phenomenon of sediment diffusion during the construction process needs to be protected by setting a protective cover. Controlled cutter suction dredgers are more suitable for digging non-cohesive soft soils, such as various types of silt, loose sand, loose plastic clay, and can be used in various dredging projects.
Before carrying out ecological dredging, a test must be carried out to investigate the thickness of the silt layer and count the amount of dredging work. At this time, the sonar tester can be used to test and determine the basic topography of the river bottom. The test point is transmitted to the terminal receiving device designated by the user (such as a mobile phone or a tablet computer) through GPS technology. During the sonar test, two different frequencies are used at the same time. On the one hand, the so-called fixed sludge layer can be measured, and on the other hand, the natural river bottom can be measured. In this way, the thickness of deposited sludge at different sections can be calculated and measured.
The data is passed to a PC, mobile phone, tablet on shore. Through the numerical display, the operator can immediately know the instantaneous basic situation of the river bottom where the dredger is located. The suction dredge is additionally equipped with a GPS system, thus having an electronic navigation function.
These tested areas can be numerically divided into small areas. Because the sludge thickness at the location of the suction dredge can be accurately calculated, a comparison can be made between the required suction sludge thickness and the actual removal thickness after the sludge suction. The sludge solid content and sand content are tested multiple times a day to determine and record for archiving.
After ecological dredging, it is recommended to conduct a sonar test again, so that you can understand the overall situation before and after dredging. The final chart is also used as a reference document for the next dredging work.
In order to prevent clogging, the coarse faulty substances in the deposited sludge must be cleaned in advance. At this time, various types of grille equipment can be installed on the sediment suction device to clean and pretreat the river, and separate and remove various faulty substances (plastic bags, sacks, coke bottles, glass bottles, metal wood blocks, etc.) . The mud suction robot installed with the filter grid first screens and filters the silt along the river bottom, and separates and removes the above-mentioned faulty substances. During this process, the long-term deposited sediment can be loosened.
Cutter suction dredgers are currently widely used in dredging projects. Compared with other dredgers such as (self-propelled trailing suction dredgers, chain bucket dredgers, grab dredgers, mud boats, etc.), the cutter or bucket wheel of the cutter suction dredger cuts and stirs the dredged material on the seabed, and then uses the powerful pumping force of the underwater pump and the pump in the cabin to remove the dredged material through the mud pipe Ship to designated area.
Dredgers and suction boats must be equipped with working boats, which are responsible for anchoring and lifting. When buying and selling, attention should be paid to the spare parts: ①Whether the working boat is provided together. ② How many discharge pipes are there? ③ There should be 4 working anchors, at least two of which should reach the float of the anchor. ④Whether there is a guide pin for the positioning pile.
The cutter suction dredger is towed by the tugboat to the construction area, and uses DGPS to locate the starting point of excavation in the construction area. Deeply lower the reamer bridge for excavation, and the soil crushed by the reamer will be transported to the designated mud receiving area through the dredger’s high-power centrifugal dredge pump through the dredger pipeline.
OCEAN Pump had been specializing in delivering turn key sand dredgers and sand pumps to worldwide customers. We have a strong ability in custom sand dredgers designing and manufacturing. In recent years, we have been keeping on desploring in technological innovations and sand dredgers modular customizations. The safe and efficient operation of most kinds of our sand dredgers can collaborated with our customized solutions by our professional staffs and solid technologies.
Sally Peng
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Email: oceanpump2@tsbeng.com, sales@sanddredgers.com
