The underwater trencher guides along the submarine pipeline and the guiding mechanism on the trenching and sinking submerged trencher is stuck on the submarine pipeline by the lifting oil cylinder and rolls along the submarine pipeline. The relative position between the trencher and the submarine pipeline to prevent the trencher from detaching from the pipeline and also protect the pipeline from damage by the reamer. Turn on the reamer, water jet pump, and sludge pump of the underwater trencher. When the trench type and the position of the pipeline in the trench can be displayed on the monitor of the color image sonar system, when the design position is reached, lock the underwater trench The working state of the ditch machine. Adjust the traction system of the underwater trencher so that the angle between the traction rope and the seabed is within the allowable range.
When the water depth is 1.520m, the value is generally taken as 023. When the water depth is more than 20m, the value is generally taken as the anchor rope of the twisting displacement system. The barge carrier moves in the direction of the submarine pipeline, and the underwater trencher follows the barge carrier in synchronization Dig the trench along the pipeline and dig out the required V-shaped trench on the 2nd side of the submarine pipeline. The pipeline falls into the trench bottom by its own weight and the trench is naturally backfilled.
Use effect of barge-drag-type beach trenching device
The device has been successful since its trial use and continuous construction, modification and improvement over several years. Through the use, the construction difficulties of trenching and sinking pipes on the seabed are better solved. The device completed the trenching and sinking of the first submarine landing pipeline and the laying of submarine cables in the 35 well of Zhuanggu 46 and 35 wells, and completed the trenching and sinking of other submarine landing pipelines in Chengdao Oilfield and part of the submarine cables. Laying tasks. So far, Shengli Oilfield has produced 3 million tons of crude oil offshore each year, which has basically been transported by subsea oil pipelines. The use of this device will play a certain role in the continuous rolling development of crude oil in shoals and shallow seas.
The device can meet the use of the offshore waters of the Bohai Bay, and can better solve the construction task of trenching and sinking of submarine pipelines in the Chengdao Oilfield. With the continuous exploitation and expansion of offshore oilfields, the number of submarine pipelines has increased year by year, and the use value of barge-sled beach-type trenching devices will be higher and the scope of popularization will be wider.
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