Heading Control and Adjustment Method of Lowering Anchor Pile

Abstract

The invention relates to an anchor pile downward placement head direction control and adjustment method. The method comprises the following steps: (A) an anchor pile is downwards put in water through a lifting cable; and an outer ring of the anchor pile is connected with a horizontal traction cable; (B) a lifting cable is used for lifting a balancing weight to the water bottom; the other end of the horizontal traction cable can fit the lifting cable in a vertical sliding manner; and in the downward placement process of the anchor pile, the horizontal tightening of the horizontal traction cable is kept to limit the rotation of the anchor pile; and (C) when the anchor pile is positioned in a target area, and the head direction thereof accords with requirements, the anchor pile is continuously downwards put into mud for sinking in a seabed. The lifting cable is used for lifting the balancing weight to the water bottom; the anchor pile is towed in the specific head direction to position the head direction of the anchor pile in the downward placement process; and the steering of the anchor pile is controlled to prevent the rotation of the anchor pile due to instable gestures caused by ocean current impact in the downward placement process, so that no deflection of the head direction of the anchor pile in downward placement is guaranteed. The method improves the working efficiency, saves the project cost, and prevents the operation risk.

Description

technical field [0001] The invention relates to the field of offshore oil engineering, and more specifically relates to a heading control and adjustment method for lowering anchor piles. Background technique [0002] In the project of installing single point mooring system in the South China Sea, the suction anchor needs to be accurately lowered into the target area, and there are strict requirements on the heading accuracy of the suction anchor, and the heading error is required to be less than 5°. [0003] After the floating crane lowers the suction anchor into the water, the suction anchor is impacted by waves and currents, and its posture in the water is unstable and easy to rotate. When the display of the positioning system shows that the heading of the suction anchor meets the design angle, the moment the crane lowers the suction anchor into the mud, the suction anchor rotates due to unstable posture, resulting in a deviation of the heading angle. The suction anchor h...

AI Technical Summary

Problems solved by technology

[0004] 1. The suction anchor sinks into the seabed. When the crane lifts the suction anchor out of the mud surface, the suction anchor is subject to a large friction force from the seabed sediment, which may easily cause the lifting cable to break

[0005] 2. The seabed soil layer in the target area is disturbed, which affects the effect of installing suction anchors later

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