1. Equipment transfer
The cutter suction dredger is divided and then transported into the site by land by flatbed truck, and a suitable site is selected for lifting and launching the assembly. It can also enter the destination by sailing.
2. Pipeline arrangement
The design of the mud discharge pipeline is based on the principle of shortening the construction row distance as much as possible and should minimize the impact on the environment. In the stern of the dredger according to the actual need to connect the floating pipe on the water, after the floating pipe
After the floating pipe, the land pipeline will be extended to the soil enclosure area and enter the mud dumping site.
When the land pipeline crosses the road, it is buried underground. The mainland pipeline is laid along the embankment and supported by double rows of steel pipe scaffolding at the joints of the pipeline on land and water. Pipeline
Erection precautions: pipeline erection should be adjusted according to the construction progress and the location of the water outlet in time. The connection should be firm, the interface should be tight, and no leakage should occur. The mainline should be as
As much as possible flat, straight, no dead bend.
After the suction dredger is connected to the floating pipe along the shore near the yard, and then connected to the shore pipe into the yard. When the rated discharge distance of the suction dredger is exceeded, the mud discharge pipeline will be connected to the pumping vessel in series halfway.
When the rated distance of the dredging vessel is exceeded, a relay pumping vessel will be connected to the dredging line and pressurized to transport the earth. Before the formal dredging production, a clear water pressure test is carried out on the pipeline to ensure that the whole line is sealed without leakage before the formal dredging production starts.
3. River dredging
(1) Positioning and anchoring the winch dredger. When the dredger enters the construction area, use GPS to locate and push the bow and stern with the anchor boat, gradually adjust the position of the ship to reach the set position.
When anchoring, transfer the reamer to the dredging edge line and put it into the mud to fix the ship, and master the anchoring position. Tighten the transverse cable after anchoring, and after the anchor is caught, then the reamer can be put out of the mud surface.
The reamer can be raised to the mud surface.
(2) dredging sequence. Firstly, excavate one dredging channel in the first and last strip on the edge of the dredging area, and other strips according to the standard width of the hull excavation, and excavate according to the principle of "near soil far transfer, far soil near transfer".
(3) dredging method. Dredger dredging using horizontal dredging method, that is, the left positioning pile as the main pile, as the transverse swing center, the use of left and right cable alternately put away, swing dredging. Excavation of good partition by the technical staff according to the area number, construction time, construction team, and quality control to make a detailed record, and make a mark on the plan.
(4) CSD spud piling, piling, and moving the ship. As the suction dredger needs to start the pile positioning and move the ship, in order to prevent the danger, other vessels can no longer in the dredger construction range of activities.
(5) Quality control: the ship is equipped with an accurate positioning system, using the marine global positioning system (GPS) for plane positioning, controlling the excavation depth by depth indicator and reamer pressure sensor, observing the water level change every two hours, adjusting the reamer depth according to the water level at any time, preventing under-digging and over-digging, and testing with echo sounder after excavation.
