Cutter suction dredger suitable for standard penetration cardinal number large mud and construction method thereof

Abstract

The invention belongs to the field of cutter suction dredgers, and particularly relates to a cutter suction dredger suitable for standard penetration cardinal number large mud and a construction method thereof. A 5-degree included angle is formed between a mud suction pipe and a reamer head of the cutter suction dredger suitable for standard penetration cardinal number large mud. According to the cutter suction dredger suitable for standard penetration cardinal number large mud and the construction method thereof, the losses of a water head of the mud suction pipe are reduced, the cut mud thickness is increased, and the ship efficiency is indirectly improved.

Description

Technical field [0001] The invention belongs to the field of cutter suction boats, and particularly relates to a cutter suction boat suitable for mud with a large standard penetration base and a construction method thereof. Background technique [0002] At present, our company newly introduced a cutter suction vessel with advanced equipment from Dutch DAMEN company. Its model CSD500 includes a trolley 50 meters long and 7.95 meters wide. It is equipped with 70 ordinary chisel teeth, the length of the steel pile is 19 meters, the designed dredging depth is 14 meters, and the front end of the cutter head is increased by 15° in the design process to reduce the impact on the productivity of the ship when the mud surface is dried out. . However, during the construction process, the cutter suction vessel was found to have the following shortcomings: [0003] First: During the construction process, the reamer pressure is relatively large, and the value is basically maintained at about 1...

AI Technical Summary

Problems solved by technology

[0003] First: During the construction process, the pressure of the reamer is relatively high, and the value is basically maintained at around 130-170bar. The pressure of the reamer in some areas fluctuates within the range of 180-250bar (the maximum value of the pressure gauge of the ship reamer is 250bar), which often causes the reamer to hold back Phenomena, resulting in slow traverse speed during construction, and the traverse cannot be continuously oscillated when the reamer is held back. It is necessary to immediately close the reamer, and then turn on the reamer to continue construction after the reverse swing, which affects the decline in productivity.

[0004] Second: The ship’s excavation depth is -6 meters, and the tide level changes greatly. The maximum lowering depth of the bridge reaches 12m. , the front soil layer bears against the front end of the large circle of the bridge reamer head, which makes it difficult for the ship to move forward, and the lateral movement pressure is high and the speed is slow, which seriously affects the production efficiency

[0005] Third: During the spring tide, due to the rapid fall into the water, and most of the steel piles (19 meters in total length, 13-15 meters in the underwater part) are below the water surface and the mud is not deep enough to be lowered. Pushing and pulling the trolley during construction caused the steel piles to drive the ship. The backward shift will affect the ship's footage and cause a decrease in productivity

[0006] Fourth: The number of standard penetrations of mud in the construction area is relatively large, and the gripping force of the anchor in the mud is small when the anchor is lowered laterally in some areas, resulting in frequent anchor pulling during construction, resulting in the inability to maintain the construction concentration continuously. low rate

[0007] Fifth: The reamer teeth are severely worn during construction, and the replacement cycle is short. The mud-cutting ability of the reamer teeth also affects the ship's excavation productivity

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