Composite pile foundation

Abstract

The invention discloses a composite pile foundation. Tube-shaped connection sections are respectively arranged at the center of the top and the center of the bottom of a truss of a four-foot guiding pipe frame foundation, single-pile foundations are inserted on an upper connection section and a lower connection section and fixedly connected with the connection sections, and the connection can be specifically in a welding mode, in a grouting mode through a shear connector, in an elastic mode through an elastic member or the like. The composite pile foundation fully takes advantages of specific stress of the single-pile foundations, strong application capacity to a soil layer, convenient construction, good horizontal bearing capacity of the four-foot guiding pipe frame foundation and the like, is greatly improved in integral rigidity, horizontal load resisting, vertical load resisting and bending moment capacity compared with a single single-pile foundation or four-foot guiding pipe frame foundation, particularly changes the stress mode of the single-pile structure, effectively reduces bending moment load on the foundations caused by fan load, reduces horizontal displacement of a wind power structure and accordingly reduces pile length, pile diameter, wall thickness and penetration depth, remarkably reduces material cost, and is simple in construction process.

Description

technical field [0001] The invention relates to a foundation structure in the construction field, in particular to a pile foundation. Background technique [0002] Offshore wind power structures are high-rise offshore structures with relatively small vertical loads and large bending moments caused by horizontal loads, and require high anti-overturning capabilities. [0003] The monopile foundation structure is a common form of foundation for offshore structures, especially in the field of offshore wind power. It is most widely used in European offshore fields. Its structure is simple and its force mechanism is clear. It is economical to use for wind turbines below 1.5MW. However, due to the weaknesses of the single pile foundation such as poor anti-overturning ability and large horizontal displacement, as the single unit capacity of offshore wind turbines increases to 3MW, 5MW or more, the diameter, wall thickness and penetration depth of the single pile foundation will inev...

AI Technical Summary

Problems solved by technology

However, due to the weaknesses of the single pile foundation such as poor anti-overturning ability and large horizontal displacement, as the single unit capacity of offshore wind turbines increases to 3MW, 5MW or more, the diameter, wall thickness and penetration depth of the single pile foundation will inevitably increase sharply. Large, resulting in difficulties in offshore piling construction and a substantial increase in construction costs

[0004] Three-pile tripods, multi-pile jackets, and high-pile cap foundations can effectively disperse loads and improve overturning resistance through different methods, but their structures and construction processes are complex and require high sea conditions, resulting in long construction periods and high construction costs.

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