Underwater grouting construction system and method of straight pile outer-sleeve type jacket with first pile method

Abstract

The invention discloses an underground grouting construction system and method of a straight pile outer-sleeve type jacket with a first pile method. The construction system comprises a steel pipe pile and a jacket sleeving the outer side of the steel pipe pile, and a annular grouting space is formed between the steel pipe pile and the jacket; a main grouting pipe, a spare grouting pipe and a bottom sealing pipe are arranged on the jacket, the main grouting pipe, the spare grouting pipe and the bottom sealing pipe correspondingly penetrate through the jacket and communicate with the annular grouting space. The construction method comprises the steps that the steel pipe pile is piled, and the jacket sleeves the outer side of the steel pipe pile; a rubber bag in a packer is filled and bulged by pumping grouting materials through the bottom sealing grouting pipe, and the situation that grouting materials are hardened is waited; the annular grouting space is grouted through the grouting pipe; when water in the annular grouting space completely flows out from the outlet above sea level, the valve on the outlet is closed, and grouting is conducted continuously until the end of grouting. According to the underground grouting construction system and method of the straight pile outer-sleeve type jacket with the first pile method, the construction technology is simple, the grouting efficiency and quality are improved, and the success rate and the quality of underwater grouting of the jacket are guaranteed.

Description

technical field [0001] The application belongs to the technical field of jacket foundation construction of an offshore wind power step-up station, and specifically relates to an underwater grouting construction system and a construction method of a straight pile outer jacket jacket type jacket with the pile-first method. Background technique [0002] Jacket installation and construction techniques in offshore wind power foundation projects are divided into two techniques: the pile-first method and the pile-after method. Different plugging methods can be adopted according to the jacket structure type, jacket installation and piling sequence. Both the pile-first method and the pile-after method can adopt two different types of plugging methods: "active" or "passive" for underwater grouting of the jacket. A large number of domestic offshore wind power projects such as Jiangsu Luneng Dongtai, Jiangsu Datang Binhai, Jiangsu Three Gorges Dafeng, and Zhejiang Putuo 6# Wind Power P...

AI Technical Summary

Problems solved by technology

If the above problems are not handled properly, there will be phenomena such as easy plugging of the pipe during the grouting process, lax sealing and damage of the packer, etc., resulting in grout leakage that will seriously affect the construction effect

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