Novel pile leg butt joint coupling system and float-over installation method

By combining a new type of pile leg docking coupling system with a hydraulic jacking device, the shortcomings of traditional hoisting and high-level floating methods have been solved, enabling the safe and efficient installation of large offshore platforms in shallow waters, and reducing equipment costs and construction difficulties.

CN122446680APending Publication Date: 2026-07-24POWERCHINA ZHONGNAN ENG
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Patent Information

Application Number
CN202610921998.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-25
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Traditional hoisting methods are insufficient to meet the installation requirements of large offshore platforms, with problems such as insufficient hoisting capacity, high operational risks, and difficulty in controlling positioning accuracy. High-level floating overlay methods have disadvantages such as high barge stability requirements, lengthy docking and load transfer processes, sensitivity to sea conditions, and unsuitability for shallow waters. There is an urgent need for a safer, more efficient, and lower-cost installation technology.

Method used

A new type of pile leg docking coupling system is adopted, combined with a hydraulic jacking device, to realize the active transfer of the load of the upper block, reduce the requirements for barge load adjustment capacity and water depth, simplify the docking process, and improve construction efficiency and fault tolerance.

Benefits of technology

It enables efficient and safe installation of superstructure modules in shallow waters, reduces the requirements for barges and sea conditions, simplifies the construction process, improves construction efficiency and fault tolerance, and reduces equipment costs.

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Abstract

The present application belongs to the technical field of offshore engineering float-over installation, and particularly relates to a new type of pile leg butt joint coupling system and a float-over installation method. The present application provides a new type of pile leg butt joint coupling system, a hydraulic jacking device is fixed in the interior of a jacket main leg, and a pile leg butt joint coupling device is rigidly connected with a piston rod. During installation, after a barge loads an upper block in place, the upper block is inserted and the pile leg butt joint coupling device is butt jointed through the jacking of the hydraulic jacking device, and the load transfer can be completed without complex barge loading adjustment. The jacking height is dynamically adjusted according to the pressure sensor throughout the process, so as to ensure the block level. After the load transfer is completed, the barge is withdrawn, the sleeve is clamped in the jacket main leg through pressure relief of the hydraulic device, and the installation is completed. The present application reduces the requirements for the barge, water depth and weather window, effectively improves the construction fault tolerance and efficiency, and widens the float-over installation application scenarios.
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