"Pile first method" interpolated jacket foundation construction system for implantable rock-socketed pile

Abstract

This application discloses a "pile first method" interpolated jacket foundation construction system for an implantable rock-socketed pile. The construction system comprises a steel pile casing, a steel pipe pile prefabricated with pile core bottom sealing concrete and a jacket; the steel pile casing is sank to a preset position, the steel pipe pile prefabricated with the pile core bottom sealing concrete is implanted in the inner side of the steel pile casting, and a first annular space among the bottom of the steel pipe pile, the steel pipe pile and a rock-socketed hole wall and a second annular space between the steel pipe pile and an overburden layer are both prefabricated with grouting pipelines; and after the first annular space and the second annular space are grouted, the tip part of a pile leg column of the jacket is inserted into the steel pipe pile and fixedly connected with the steel pipe pile, and a third annular space is prefabricated with a grouting pipeline. This systemproposes to pre-pour pile core the concrete to seal the bottom in the pile before the steel pipe pile is shipped, the construction risk is reduced, a offshore construction window is saved, the construction quality of the pile core concrete and the grouting construction quality of a rock-socketed section are ensured, and at the same time, the grouting quality of the rock-socketed section is ensured.

Description

technical field [0001] The application belongs to the technical field of offshore wind power foundation construction, and in particular relates to the "pile-first method" interpolation jacket foundation construction system of implanted rock-socketed piles. Background technique [0002] For the foundation types of Shanghai wind turbines with complex geology, the selection of domestic wind power site foundations mainly includes large-diameter single pile rock-socketed foundations, high pile cap group pile rock-socketed foundations, jacket foundation piles, and suction cylinder foundations. In the offshore wind power projects with complex geology of 20-50m water depth that have been under construction or are being tendered in Guangdong, Fujian and other regions of my country, some sites adopt a three-pile jacket or four-pile jacket foundation structure. For some wind farm sites with relatively thin covering layers, rock-socketed piles are required for the jacket pile foundation...

AI Technical Summary

Problems solved by technology

For the underwater grouting plugging of the jacket grouting section, once the rubber packer prefabricated on the jacket leg column is damaged, there is a huge risk of grout leakage that is difficult to remedy

For the on-site pouring of pile bottom sealing concrete before grouting at the bottom of the implanted pile, it is difficult to pour concrete on the construction site of the offshore mixing ship and the risk of cross-operation with grouting

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