A single pile foundation pile top flange replacement and repair process

Abstract

The invention discloses a replacement and repair process of a pile top flange of a single pile foundation. The replacement and repair process comprises the following specific steps of A, original flange removal, B, flange pre-installation preparation, C, construction of an inner platform device on the inner side of a flange, D, flange installation, E, flange welding and F, post-welding inspection.A pile driving and stabilizing platform device includes a lower layer platform mechanism, a stand column mechanism, an upper layer hoop mechanism, an abutting mechanism and a platform supporting mechanism. The stand column mechanism is connected with the lower layer platform mechanism and the upper layer hoop mechanism, and the single pile foundation penetrates through the upper layer hoop mechanism from top to bottom and the abutting mechanism is disposed outside the upper layer hoop mechanism and is arranged to abut against the single pile foundation. The platform supporting mechanism is disposed on the end surface of the outer side of the lower layer platform mechanism. The replacement and repair process has the following advantages that the steps are orderly, construction environmenttemperatures and humidity are effectively ensured, safety operation is improved, levelness and flatness of the flange are ensured, and replacement and repair of the flange are ensured to be performedstably and efficiently.

Description

technical field [0001] The invention belongs to the field of offshore wind power, and in particular relates to a process for replacing and repairing a pile top flange of a single pile foundation. Background technique [0002] my country has a vast sea area, abundant offshore wind energy resources, and great potential for wind power generation. With the independent development and application of new wind power technologies, new materials and new processes, my country's offshore wind power has entered a stage of large-scale construction. Wind turbine foundation construction is one of the important links in offshore wind power construction. The foundation types of offshore wind turbines include gravity foundation and pile foundation, and the floating foundation technology is also under research and development. Pile-supported foundations include single-pile foundations, multi-pile concrete cap foundations and multi-pile jacket foundations. [0003] After the single pile found...

AI Technical Summary

Problems solved by technology

[0003] After the single pile foundation is inserted at sea, if the levelness and flatness of the pile top flange cannot meet the requirements, the pile top flange of the single pile foundation needs to be replaced and repaired. When replacing the flange, the original flange needs to be replaced. Remove and then install and weld. At the same time, the replacement and repair of the top flange of the single pile foundation is carried out at sea. The air convection and high humidity in the construction area bring certain difficulties to the replacement and repair of the top flange of the single pile foundation, especially for the original method. Flange removal and flange welding, the welding quality is poor, and the ellipticity and flatness of the pipe end after replacement cannot be guaranteed; the traditional pile top flange replacement and repair process steps are messy, and there is no relatively perfect process to improve work efficiency; When the top flange is replaced and repaired, work is carried out on the top of the monopile foundation. The transport ship is placed close to the offshore position of the monopile foundation and a temporary pile stabilization platform is built around the monopile foundation through the transport ship for the operators to perform climbing operations. The unsafe factors in the operation and the influence of sea breeze and seawater have extremely high requirements for the stability of the single pile foundation. The existing pile stabilization platform is composed of multiple guide steel pipes inserted into the seabed. The construction platform is built on the upper part of the guide steel pipes. It is simple, and it is only used for personnel to climb construction, and the safety of personnel cannot be guaranteed at all. Especially for the construction of pile top flanges, the stability requirements for single pile foundations are extremely high, otherwise the welding accuracy of the flanges will be affected. For The replacement and repair work also brings certain difficulties, and the levelness and flatness requirements of the flange cannot be guaranteed

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