A method for on-site continuous preheating and multi-stage welding installation of giant offshore pile legs

Abstract

The invention discloses a method for on-site continuous preheating and multi-section welding and installation of giant marine engineering pile legs. In the installation hole on the working platform; hoist the second segmented pile to the upper end of the first segmented pile, weld a section, and move down a section until the lower end of the pile leg contacts the seabed. Due to the use of segmented on-site direct welding and installation, the operating cost and risk factor are greatly reduced, and the problems of limited space on the offshore platform and excessive requirements for the selection of cranes are solved. Since this patent establishes a welding preheating mathematical model, a welding process of welding material selection, welding joint priming, filling, capping, groove preparation, back root cleaning, hydrogen elimination treatment, and stress relief is formed. The solution of the invention not only reduces the welding stress and improves the anti-fatigue performance, but also solves the problem of large deformation caused by large-scale multi-section welding.

Description

technical field [0001] The invention relates to the technical field of marine engineering equipment, in particular to a method for multi-stage welding of giant marine engineering pile legs. Background technique [0002] Wind energy, as an inexhaustible renewable energy, has been paid more and more attention by people, not only to build wind power plants on land, but also to start large-scale construction of offshore wind farms. The development of offshore wind power is the general trend. Compared with the installation of onshore wind turbines, the installation of offshore wind turbines is more technically difficult. It is one of the key technologies for the construction of offshore wind farms. For complex sea conditions and weather conditions, the development can meet various functional requirements. There is an urgent need for ultra-large offshore wind power installation platforms. [0003] The existing pile leg installation is to weld the whole pile leg completely, then c...

AI Technical Summary

Problems solved by technology

This scheme is an improvement to the existing technical scheme of using single-sided preheating pile legs for super-large thick plates that cannot achieve the purpose of uniform preheating. It only focuses on the single factor of pre-welding preheating and does not consider other influencing factors. This scheme There are certain limitations to the improvement of weld quality

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