Welding process of offshore wind power foundation steel pipe pile

Abstract

The invention discloses a welding process of an offshore wind power foundation steel pipe pile. The welding process comprises the following processes of weld groove forming, steel plate butt joint longitudinal seam welding, coiling and longitudinal seam welding, 1+1 single-pipe joint splicing circular seam welding, 2+2 section splicing circular seam welding, flange and single-pipe joint welding and whole-pile splicing circular seam welding. When a weld groove is formed, an X-shaped weld groove is formed in a butt joint edge of the steel plate, the angle of an inner weld groove is 50 +/-5 degrees, the depth of the inner weld groove is 2/3 of the thickness of the steel plate, a blunt edge is 2-5 mm, a root gap is 0-1 mm, and the angle of an outer weld groove is 90 +/-5 degrees. According tothe welding process, different welding methods such as automatic submerged arc welding and gas shielded welding are combined, so that a welding seam with excellent quality is obtained, requirements for the mechanical property, the bending resistance, the tension resistance and the impact resistance of the steel pipe pile are met, the welding defects such as longitudinal cracks and transverse cracks of the welding seam are greatly reduced, so that the impact resistance of the steel pipe pile can be effectively improved.

Description

technical field [0001] The invention relates to a welding process of steel pipe piles for offshore wind power foundations. Background technique [0002] At present, in order to save costs, domestic offshore wind power projects often use relatively high-power wind turbines, and the load on the upper part of the wind turbine is relatively large, and the shallow surface layer in domestic coastal areas is mostly muddy soft soil. The compressive bearing layer is very deep, and if ordinary pile foundations are used, a pile hammer with a large impact force must be used for pile sinking. It will be difficult to adapt to conventional reinforced concrete and prestressed concrete piles, so steel pipe piles are often used for reinforcement. foundation. The monopile foundation is the most widely used wind turbine foundation type in offshore wind farms. In the current wind farms built in Europe, the monopile foundation accounts for more than 70%. There are three types of single pile fou...

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Problems solved by technology

[0002] At present, in order to save costs, domestic offshore wind power projects often use relatively high-power wind turbines, and the load on the upper part of the wind turbine is relatively large, and the shallow surface layer in domestic coastal areas is mostly muddy soft soil. The compressive bearing layer is very deep, and if ordinary pile foundations are used, a pile hammer with a large impact force must be used for pile sinking. It will be difficult to adapt to conventional reinforced concrete and prestressed concrete piles, so steel pipe piles are often used for reinforcement. foundation

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