Relevant content about mining pipelines under the sea

The main technical parameters of the barge are 50m in length, 18m in width, 2.5m in depth, installed power of 1250kW, and total displacement of 1000t.

The trencher has a length of 9m, a width of 7m, a height of 5m, and a mass of 50t.

Immersed pipe speed 60180m / h, trench depth 1.52m, trench width 35m, positioning accuracy 2m.

Communication navigation and positioning system Communication navigation and positioning system consists of communication equipment and split GPS satellite positioning system. The positioning of the trench machine guides the navigation of the barge-drag-type beach digging device, which is convenient for offshore construction and contact with land.

Offshore construction

The preparation work and adapting to the environment should be carried out under the conditions of the previous process and the natural conditions permitting the construction of trenching and sinking of the coastal bottom pipeline of the dragging and sledding type beach trenching device.

The pipeline should be placed on the seabed according to the design, and some necessary preliminary work should be carried out, such as pipeline crushing and cleaning of the bundles on the pipeline. Before construction, the tug is guided by GPS satellite navigation and positioning system, and the barge-drag-type beach trenching device is towed to the construction area. Use a color image sonar system to sweep the sea, search for the exact location of the submarine pipeline, and remove foreign objects on the 2nd side of the pipeline on the seabed.

The natural conditions are as follows:

1 The water depth should be within 0.820m.

2 The seabed should be of soil quality or similar.

3 The wind force is less than 5 and the wave height is less than 1m. There is no ice season.

Positioning and displacement of barge-drag-type beach trenching device

After the barge-drag beach trenching device reaches the construction area, the anchor for the displacement system on the barge carrier is thrown by the anchor boat on the 2 sides of the submarine pipeline according to the needs of on-site construction. Twist the anchor rope to make the barge carrier close to the beginning or end of the pipeline, and place it directly on the water surface of the pipeline, to achieve the positioning of the barge-drag beach trenching device. 8 winches can control each direction and distance of travel. In order to improve work efficiency and reduce workload, according to the different sea conditions (water flow, meteorology, etc.), the water flow and wind direction can be used to anchor at a favorable position to complete the positioning and displacement of the barge-drag beach trenching device.

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