Composite pile foundation

Abstract

The invention discloses a composite pile foundation. Cylindrical connecting sections are respectively arranged in the centers of the top and the bottom of a truss on the five-feet bracket type foundation; the upper and lower connecting sections are inserted into a single-pile foundation; the single-pile foundation is fixedly connected with the connecting sections; and welding, grouting connection through a shear key or elastic connection through an elastic body can be adopted. The advantages of definite stress of the single-pile foundation, high soil layer applicability, convenient construction, high horizontal bearing capacity of the five-feet bracket type foundation and the like are fully utilized, compared with the independent single-pile foundation or the five-feet bracket type foundation, the composite pile foundation has the advantages that the integral rigidity, horizontal load resistance, vertical load resistance and bending moment resistance are greatly improved, particularly the stress mode of the single-pile structure is changed, the bending moment load of the fan load on the foundation is effectively realized, and the horizontal displacement of the wind power structure is reduced, so that the pile length, the pile diameter, the wall thickness and the penetration depth of the pile foundation are reduced; and therefore, the material cost is greatly reduced, and the construction process is simple.

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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