Underwater Jacket Pile-Driving Jacket Type Positioning Structure

Abstract

The invention provides a sleeve-type positioning structure for underwater jacket piling. A jacket comprises a pile leg casing; a foundation steel pipe pile is driven into the pile leg casing; the positioning structure at least comprises a first sleeve and a second sleeve; the second sleeve is coaxially connected with the bottom surface of the first sleeve; the inside diameter of the second sleeve is greater than the outside diameter of the pile leg casing; the inside diameter of the first sleeve is less than that of the pile leg casing; an inclined support pipe and a lower support pipe are arranged on the outer wall of the pile leg casing; the second sleeve sleeves the pile leg casing; and when the bottom of the pile leg casing is propped against a seabed in the sea area where the positioning structure sinks, the top surface of the first sleeve is not lower than the water level of the sea area during a construction period. Through the positioning structure, the construction of the underwater jacket foundation pile can be changed from underwater pile insertion into overwater pile insertion, and underwater manual operation is not needed; and the positioning structure is simple, convenient and flexible to operate, saves materials and has small construction difficulty, high construction efficiency and high positioning accuracy.

Description

technical field [0001] The invention relates to the technical field of offshore wind farm engineering, in particular to an underwater jacket piling casing positioning structure. Background technique [0002] With the development of my country's offshore wind power generation technology, in the construction of offshore wind farms, because the jacket foundation draws on the experience of offshore oil platforms, the foundation has a wide range of applications. Therefore, the jacket foundation is more and more widely used in offshore wind farm projects. [0003] The jacket foundation is a common structure for offshore structural platforms. Three or more foundation steel pipe piles are driven into the seabed, and the jacket is connected to each foundation steel pipe pile. The lower part of the jacket and the foundation steel pipe piles are connected by grouting, and the upper part of the jacket and the tower are connected by flanges. The jacket also plays the role of foundation l...

AI Technical Summary

Problems solved by technology

However, when the water depth is deep or the wind farm site is located in the freezing sea area of ​​northern my country in winter, the main nodes of the jacket and the tops of the pile leg casings are located below the sea level. Pipe piles cannot be observed with the naked eye during pile sinking construction, and are affected by ocean currents, waves, etc., and cannot be manually assisted. Low

[0004] In view of the fact that the main nodes of the jacket and the tops of the leg casings are located below sea level, at present, the method of directly lengthening the leg casings of the jacket is mainly adopted, and the extended leg casings are cut off later. Although it can improve the positioning accuracy of steel pipe piles for underwater foundations and reduce the difficulty of construction to a certain extent, it will greatly increase the construction workload and waste materials due to the need to cut off the lengthened pile leg casings in the later stage

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