A construction process for self-elevating and self-propelled platform pile legs

Abstract

The invention relates to a self-elevating and self-propulsion type platform pile leg construction process. The self-elevating and self-propulsion type platform pile leg construction process comprisesthe procedures of cylinder section part manufacturing, cylinder section lengthening, structural lineation, structural assembly, rack plate mounting and welding, structural customs inspection, internalaccessory mounting, tide staff mounting and transfer sand blasting. The self-elevating and self-propulsion type platform pile leg construction process has the following advantages: pile legs are segmented as cylindrical structures, and multiple cylinder sections are assembled as one subsection, so that the construction efficiency is improved, and the construction cost is reduced; vertical reinforcing ribs and T-shaped reinforcing rings respectively achieve longitudinal and transverse fixing and reinforcing effects; structural pipes achieve a transverse reinforcing effect in cylinders to guarantee the strength of the pile leg structures; and through such main indexes as straightness, tooth gaps and common normal lines of constraint rack plates, the construction precision of the rack platesis improved, the support capacity and the stability of the pile legs are improved, and the welding deformation and the welding cracks are prevented.

Description

technical field [0001] The invention relates to the field of self-elevating and self-propelled offshore drilling platforms, in particular to a construction process for legs of self-elevating and self-propelled platforms. Background technique [0002] With the acceleration of the development of offshore wind power energy, the development prospects of wind power installation equipment are becoming more and more broad. Self-elevating and self-propelled offshore drilling platforms, as the necessary equipment for the installation and use of wind power pipe piles, are also in short supply. Naturally, they have become one of the engineering ships that major equipment companies are vying to manufacture. When the self-elevating and self-propelled offshore drilling platform is working, the platform is usually lifted above the ocean surface by a lifting mechanism to protect it from the impact of waves, and it relies on the support of the legs to stand on the sea surface for drilling wo...

AI Technical Summary

Problems solved by technology

Application No. 201610013969.1 discloses a construction process for jack-up wind power ship legs, including four process steps: shell rolling, welding between shells, workshop pre-assembly, and pin hole cutting. The leg design requires very high strength. At the same time, it is required to reduce its own weight as much as possible, so the high-strength steel plate of E690 material with a thickness of 70mm is used to make a cylinder with a diameter of only 3600mm, which has the advantages of improving construction efficiency and reducing construction costs, but this patent lacks the welding process of rack plates Steps, so the support and stability of the legs are poor, which is easy to cause welding deformation or weld cracking

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