A kind of manufacturing method of eccentric jacket

Abstract

The invention belongs to the fundamental field of jackets of offshore wind farms, and in particular relates to a method for manufacturing an eccentric jacket. The eccentric jacket manufactured by the manufacturing method is a three-leg jacket, which includes three main pipes, which are respectively arranged between every two main pipes. There are upper, middle and lower X-braces. The prefabrication of the main pipe and X-braces is conducive to size control, reducing welding work at high altitudes, easy to control product quality, and high work efficiency. The main pipe support is preset according to the eccentricity of the main pipe and X-braces. The height difference between the X-bracing and the X-bracing reduces the adjustment work of the eccentricity between the X-bracing and the main pipe group, saves the assembly and adjustment time, and improves the work efficiency. The jacket is prefabricated in three pieces, A, B, and C. The welding work between the brace and the main pipe of the B-piece jacket is carried out at high altitude, which reduces the number of high-altitude operations and greatly improves work efficiency and work safety. Segmented prefabrication, segmented assembly, and overall assembly greatly reduce the production of eccentric jackets cost.

Description

technical field [0001] The invention belongs to the fundamental field of jackets of offshore wind farms, and in particular relates to a manufacturing method of an eccentric jacket. Background technique [0002] Wind power generation is highly valued by countries around the world because of its low carbon, environmental protection and pollution-free characteristics. In my country, onshore wind power has become saturated, and offshore wind power has started later than other countries, but it has developed rapidly. At present, the common foundation forms have been successfully applied in China. The jacket foundation has become the preferred foundation form of wind power projects due to its light weight, less steel consumption, and good stress effect. [0003] The production requirements of the jacket are high and the production is difficult, especially the eccentric jacket. There are some problems in the manufacturing process: (1) In order to control the welding residual stress,...

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Problems solved by technology

[0003] The manufacturing requirements of the jacket are high and difficult, especially for the eccentric jacket. There are some problems in the manufacturing process: (1) In order to control the welding residual stress, the welds of the jacket are required to be staggered by a certain distance, but due to the limited space , the jacket is arranged eccentrically, and the eccentric arrangement leads to irregular intersecting lines between the bracing pipe and the main pipe, and requires high precision for the beveling of the intersecting line of the bracing pipe; (2) Eccentric jacket There are many irregular welds, so manual arc welding can only be used as the welding type, which requires high personal skills of welders and high labor intensity; (3) The jacket is a three-dimensional structure, and there are many high-altitude welding operations, and the labor intensity is high , high risk; (4) The jacket is a three-dimensional structure with a large structural size and high requirements for weld quality, so it is necessary to strictly control the blanking size of each section of steel pipe and the splicing size of each stage in the manufacturing process; ( 5) The in-factory manufacturing cost of the jacket is high

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