Pile-first method jacket foundation in-pile slurry leakage prevention construction system and construction method

Abstract

The invention discloses a pile-first method jacket foundation in-pile slurry leakage prevention construction system and a construction method. The construction system comprises a steel pipe pile and a jacket, the jacket is inserted into the steel pipe pile, and an annular grouting space for pouring grouting materials is formed between the steel pipe pile and the jacket; and a gravel filling layer is further filled above the mud surface elevation in the steel pipe pile. The construction method comprises the steps that the steel pipe pile is piled to the designed elevation; the filling amount of gravels or gallets in the steel pipe pile is determined; the jacket is mounted; the jacket is leveled and locked; and the grouting materials are poured into the annular grouting space. Aiming at the construction of a pile-first method jacket foundation, in particular to a jacket structure of which a grouting connection section is above the mud surface elevation and the pile diameter is relatively large, the pile-first method jacket foundation in-pile slurry leakage prevention construction system has the characteristics of simple construction method, low equipment requirement, saving of offshore construction time, reduction of grouting material loss rate and construction cost and the like, and a powerful guarantee is provided for ensuring the connecting quality of the jacket and the steel pipe pile.

Description

technical field [0001] The application belongs to the technical field of offshore wind power foundation construction, and in particular relates to a construction system and construction method for preventing leakage of grout in jacket foundation piles by the pile-first method. Background technique [0002] According to the design and construction experience of offshore wind power projects at home and abroad, a large number of wind turbine foundations and offshore booster station foundations of 20-50-meter water depth offshore wind power projects use jacket foundation structures. From 2015 to 2018, the foundations of a large number of domestic offshore booster stations, such as the Zhuhai Guishan Offshore Wind Power Demonstration Project and the Guangdong Yangjiang Offshore Wind Power Project, began to adopt four-pile jacket foundations in batches, but the applied water depth is generally less than 30m. Since 2019, Guangdong Three Gorges Yangxishaba Offshore Wind Power Projec...

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Problems solved by technology

[0004] For the construction of the pile-first jacket foundation, especially for the grouting connection construction of the annular grouting space between the jacket and the steel pipe pile with a steel pipe pile diameter of 4-5m and a grouting connection section above the level of the mud surface, once the leakage Although grout can ensure the quality of grouting connection by prolonging the grouting time and excessive grouting, the amount of grout leakage is far greater than the theoretical amount, and the actual amount of grouting materials is several times the theoretical amount, resulting in a large amount of waste of materials and loss of construction window

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