Foundation ring structure and construction method of anti-overturning wind turbine

Abstract

The invention relates to an anti-overturning wind generator foundation ring structure and a construction method thereof. The anti-overturning wind generator foundation ring structure and the construction method thereof aim to improve the overall and local anti-overturning property of a wind generator foundation. According to the technical scheme, the structure is fixed to a foundation and comprises a foundation ring, an expanded base plate, a plurality of wing plates and a supporting rod, the lower end of the foundation ring is connected to the expanded base plate in a welded mode, the wing plates are welded between the lower portion of the foundation ring and the expanded base plate, and the expanded base plate is provided with a plurality of bolt holes and supported on the foundation through the supporting rod; pre-drilled holes are formed in the portions, corresponding to the positions of the bolt holes of the expanded base plate, of the foundation, pre-stressed anchor rods are installed in the bolt holes, the upper ends of the anchor rods are connected with the expanded base plate through bolt anchor heads, and the lower ends of the anchor rods are connected with the foundation through mortar poured into the pre-drilled holes; the foundation ring, the expanded base plate, the wing plates and the supporting rod are poured into the concrete foundation together, and the upper portion of the foundation ring is exposed out of the top of the concrete foundation.

Description

technical field [0001] The invention relates to a foundation ring structure of an anti-overturning fan and a construction method thereof. Background technique [0002] At present, the foundation of onshore wind turbines often adopts large-scale reinforced concrete expansion foundation. The foundation ring connecting the tower and the concrete cap are connected relatively independently, and the overall structure only relies on a small amount of tension bars and concrete pouring. When this type of foundation structure is subjected to a large level of overturning moment, the concrete often produces a large tensile cracking stress on one side of the load direction, and the cracks penetrate through to cause damage to the foundation structure, and the overall foundation is unstable. [0003] As we all know, the concrete structure is mainly designed according to its compressive performance, but its tensile performance is weak, and it is easy to crack and damage when the tensile str...

AI Technical Summary

Problems solved by technology

When this type of foundation structure is subjected to a large horizontal overturning moment, the concrete often produces a large tensile cracking stress on one side of the load direction, and the cracks penetrate the foundation structure, resulting in damage to the foundation structure, and the overall instability of the foundation.

[0003] As we all know, the concrete structure is mainly designed according to its compressive performance, but its tensile performance is weak, and it is easy to crack and damage when the tensile stress is large.

At home and abroad, due to the lack of anti-overturning ability, the general form of concrete foundation for wind turbines often suffers overturning damage. For example, on October 28, 2002, a strong storm hit the northwestern part of Germany, which caused the concrete foundation of the 70m high wind turbine to break away from the foundation soil. The overall structure overturned; in the Sangmei typhoon on August 10, 2006, the foundation rings of two 750kW wind turbines in the Hedingshan Wind Farm in Wenzhou, Zhejiang were damaged due to the cracking of the concrete, and the foundation rings and the lower floor of the overall foundation were cut off; In 2009, a 1.5MW wind turbine in Finner Wind Farm in New York collapsed due to the truncation below the foundation ring. There are many other accidents caused by insufficient anti-overturning ability. The cracks in the weakest link are concentrated, expanded, and penetrated until the foundation structure becomes unstable.

[0004] If a deep-buried mass concrete foundation is used, the foundation structure itself has greater anti-overturning performance, but it cannot solve the problem of fracture at the contact point between the foundation ring and the bottom plate when the overturning moment is large, and the economic cost is high

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