Pile cap foundation for offshore wind turbine and construction method thereof

Abstract

The invention discloses a pile cap foundation for an offshore wind turbine. The pile cap foundation comprises a steel pipe pile and a steel pile cap, wherein a steel pile cap pile leg is arranged at aposition, which is arranged at one end of a steel box girder, of the steel pile cap; the steel pile cap pile leg sleeves in the steel pipe pile; the steel pipe pile is used for positioning a driven pile by adopting a positioning formwork; the positioning formwork comprises a truss supporting pile, a positioning truss and a double-layer steel sleeve; the positioning truss and the truss supportingpile are connected together by virtue of the double-layer steel sleeve; a closure gap used for containing the steel pipe pile is formed in the center of an outer end of each branch part of the positioning truss; upper and lower layers of pile hoops are at least arranged at each closure gap; the steel pipe pile is fixedly held by the pile hoops; and a grouting material is filled into an annular clearance at the connecting part of the steel pipe pile and the steel pile cap pile leg, so that the steel pipe pile and the steel pile cap pile leg are connected to form a whole. The steel pipe pile andthe steel pile cap can be made in a steel structure processing plant in advance, only operations of piling, mounting and grouting need to be performed in the offshore construction site, and the offshore operation volume is greatly reduced.

Description

technical field [0001] The invention relates to the field of hydraulic structures, in particular to a pile cap foundation of an offshore wind power generating set. Background technique [0002] Pile foundations are an important structural type of offshore structures. At present, single pile foundations, jacket foundations, and high pile cap foundations are commonly used in offshore wind turbine foundations. [0003] Because the single pile foundation has only one pile foundation, it is a non-spatial structure with a small force arm. In order to meet the load from the wind turbine and various environmental loads, the pile diameter is required to be relatively large, and the pile diameter is basically greater than 7m. The equipment capacity requirements are high, and the construction is difficult. [0004] The basic structure of the jacket is complex, there are many rod nodes, and the process is cumbersome. The jacket is bulky and requires a large transport ship for transpor...

AI Technical Summary

Problems solved by technology

[0004] The basic structure of the jacket is complex, there are many rod nodes, and the process is cumbersome

The jacket is bulky and requires a large transport ship for transportation

In addition, the jacket and the foundation pile must be connected underwater, which is difficult to construct and has low reliability

[0005] High-pile cap foundations are commonly found in piers and pier foundations. Most of the caps are cast-in-place reinforced concrete structures, which are limited by strong winds and waves in offshore wind farm areas. Offshore construction efficiency is low, there are potential safety hazards, and the cost is expensive

In addition, the weight of the reinforced concrete bearing platform is large, and the seismic performance of the overall structure is poor.

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