Underwater installation method for large-size anchor pile

Abstract

The invention discloses an underwater installation method for a large-size anchor pile. The method comprises the steps that S1, a transportation barge loads the anchor pile to sail to an operation sea area; S2, the transportation barge berths the workboat, and a workboat crane hoists the anchor piles in a horizontal hoisting mode; S3, a workboat crane is lowered, the weight of the anchor pile is gradually transmitted to an anchor pile hanging platform of the workboat from the workboat crane, and underwater pile turning operation of the anchor pile is conducted; S4, the workboat crane is connected with the anchor pile hanging rigging on the anchor pile hanging platform; S5, the anchor pile is hoisted by the workboat crane, the weight of the anchor pile is transferred to the workboat crane from the anchor pile suspension platform, and the anchor pile is vertically hoisted and lowered to the preset water depth; S6, the ROV adjusts the heading direction of the anchor pile underwater, and pile inserting operation of the anchor pile is conducted; and S7, the anchor pile automatically settles by means of the self weight. A conventional DP workboat can replace a large crane ship to complete hoisting, lowering and pile inserting operation of a large-size anchor pile, and the offshore construction operation cost can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of offshore oil engineering, in particular to an underwater installation method for large-size anchor piles. Background technique [0002] combine figure 1 , in offshore oil and gas field development projects, the anchor foundation of the floating production platform 300 mooring system bears large horizontal loads and upward loads, and its stress form is different from that of fixed platform pressure piles. In actual engineering, there are two main types of anchor foundations for mooring systems: driven-in anchor piles and suction-type suction anchor foundations. Wherein, the anchor pile 100 is a hollow circular steel structure, which is embedded in the seabed by a piling hammer. The bearing capacity of the anchor pile 100 is generated by the soil friction force along the pile body and the soil resistance on the side, and usually the anchor pile 100 is installed deep under the seabed to obtain the required...

AI Technical Summary

Problems solved by technology

Usually, the installation of the deepwater anchor pile 100 is completed by a large crane ship. Due to the strong lifting capacity of the crane, the large crane ship can carry out the lifting and pile turning operation of the anchor pile 100 on the deck of the transport barge or the crane ship. Crane ships are scarce and the cost of ships is very high

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