Foundation structure design method for gravity type extended foundation of perpendicular axis fan

Abstract

The invention discloses a foundation structure design method for a gravity type extended foundation of a perpendicular axis fan and belongs to the field of construction of fan foundations of wind power plants. The foundation structure design method comprises the steps that A, the load value of the fan is corrected to the standard value of the load of the fan; B, in the normal working condition, a foundation bottom radius is determined; C, in the extreme working condition, a foundation bottom radius is determined; D, a foundation bottom radius capable of meeting the requirements of the normal working condition and the extreme working condition simultaneously of the is selected; and E, according to the formula h2>=0.38x(r2- r1), the thickness of the root portion of the foundation is determined. The gravity type extended foundation designed through the foundation structure design method is applied to the perpendicular axis fan, and on the premise that the safety requirement is met, the gravity type extended foundation can be constructed more economically. Under the conditions that design parameters and guideposts are all reasonable, according to the foundation structure design method, optimal design is conducted on a foundation structure mainly through optimization of original load data and references so as to achieve the purposes that project amount of concrete and rebars of the fan foundation and project investment are reduced.

Description

technical field [0001] The invention relates to the field of foundation construction of wind turbines in wind farms, in particular to a basic structure design method for gravity-type extended foundations of vertical-axis wind turbines. Background technique [0002] The first high-power vertical-axis fan developed and produced by the National Wind Power Research and Testing Center in China and even in the world has the following main features: the fan has a large working wind speed range, and its working wind speed range is: 2.8m / s~35m / s; except under man-made or accident conditions Except for shutdown, it can always generate electricity normally within the working wind speed range; the generator rotates around the vertical axis, which requires high foundation deformation. [0003] The current design and calculation specifications for the foundation structure of wind turbines are all regulated for the foundation of three-bladed wind turbines. Generally, according to the load ...

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Problems solved by technology

[0003] The current design and calculation specifications for the foundation structure of wind turbines are all regulated for the foundation of three-bladed wind turbines. Generally, according to the load data of wind turbines provided by the wind turbine manufacturer, combined with similar engineering geological conditions nearby, the foundation form is selected, and then carried out. The design calculation of the basic structure; and there is no definite standard for the design of the basic structure of the vertical axis fan. Generally, the calculation method of the fan foundation in the form of three blades is applied to the foundation of the vertical axis fan. However, due to the vertical axis fan under high wind speed Normal power generation, the load of the working condition is large during normal power generation, the influence of the operation mode of the vertical axis fan on the design of the fan foundation: the area at the bottom of the foundation needs to be increased, and the amount of foundation concrete is increased, thereby increasing the amount of infrastructure construction and affecting the progress of the project

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