Transformation method suitable for built old wind power plant fan foundation and application

Abstract

The invention provides a transformation method and application suitable for a built old wind power plant fan foundation, and the transformation method comprises the following steps: installing an inner ring of anchor bolts and an outer ring of anchor bolts on the old wind power plant fan foundation by using an original structure, pouring concrete at the top and the outside of a foundation middle pier after installation to form an expanded middle pier, embedding the inner ring of anchor bolts and the outer ring of anchor bolts, and fixing the expanded middle pier on the foundation. And the pretightening force after the anchor bolts are tensioned fully ensures the integrity and safety of the transformed fan foundation. The transformed fan tower can be a concrete tower or a steel tower, and can be connected with the transformed fan foundation in an anchoring manner through a steel strand or an anchor bolt cage, so that the technical transformation of the fan foundation is realized. The wind turbine foundation structure is fully utilized, an original foundation and new land do not need to be dismantled, the technical transformation cost is saved, land resources are saved, land acquisition disputes are avoided, the working procedure is simple, operability is high, the stress form of the transformed wind turbine foundation is reasonable, and good economical efficiency and safety are achieved.

Description

technical field [0001] The invention relates to the technical field of onshore wind power generation, in particular to a transformation method and application suitable for the fan foundation of an old and built wind farm. Background technique [0002] With the rapid development of my country's wind power industry, the cumulative number of wind turbines connected to the grid has exceeded 140,000 units. The service time of early grid-connected wind turbines has exceeded or is close to the designed service life of 20 years. Due to the early development time, these wind turbines The single-unit capacity is small, and most of them are located in areas with good wind resources. With the extension of operation time, the generating capacity of the unit becomes poor, the failure rate is high, and there are many potential safety hazards, which not only cannot take advantage of high-quality wind resources, but also increase the operation. Maintenance costs and security risks. As the win...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of my country's wind power industry, the cumulative number of grid-connected wind turbines has exceeded 140,000. The early grid-connected wind turbines have been in service for more than or close to the designed service life of 20 years. Due to the early development time, these wind turbines The capacity of a single unit is small, and most of them are located in areas with good wind resources. With the extension of operation time, the power generation capacity of the units will deteriorate, the failure rate will be high, and there will be many safety hazards. Maintenance costs and safety risks

As the wind power market enters the era of parity, the single-unit capacity of wind turbines in my country has entered the era of large megawatts. The large number of small-capacity units has also caused waste of land resources to a certain extent. Therefore, replacing large-capacity units for old wind farms The technological transformation of the

[0003] There are many old wind farms in our country, and the land resources are scarce. In order to effectively reduce the cost of technical transformation of old wind farms and save land resources, the renovation of old wind farms should be done on the basis of the original wind turbine locations and wind turbines as much as possible to reduce or avoid new wind farms. Requisition land to reduce demolition work; early grid-connected wind turbines have small unit capacity, steel towers are generally used for the tower, and the connection between the steel tower and the foundation is generally connected by the foundation ring. , it is necessary to increase the diameter of the bottom of the tower, the interface between the tower and the foundation changes, and the original foundation ring cannot directly meet the connection between the tower and the foundation

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