Onshore wind turbine generator and construction method for onshore wind turbine generator

Abstract

To provide an onshore wind power generation device and a construction method of the onshore wind power generation device capable of increasing the size and height of the onshore wind power generation device without increasing the diameter of a tower during transportation.SOLUTION: The tower structure includes a tower 3 supported on the ground G, and a concrete lining part 4 surrounding the lower side of the tower 3 and provided integrally with the tower 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an onshore wind turbine generator and a method for constructing an onshore wind turbine generator. [Background technology]

[0002] Onshore wind power generation equipment is becoming larger and taller in anticipation of increased power generation. However, in recent years, the size and height of onshore wind power generation equipment has reached a limit due to the limited capacity of erection cranes (1,200-ton all-terrain cranes) and transportation restrictions imposed by road construction limits. For this reason, the applicant has developed a method for constructing larger and taller onshore wind power generation equipment without the need for a 1,200-ton all-terrain crane (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-152120 Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, the taller an onshore wind power generation device is, the greater the moment that occurs at the bottom of the tower that supports the wind turbine and generator. To withstand this large moment, the tower must be large in diameter. Because there is no way to transport a large-diameter tower, several methods have been proposed in which a large-diameter tower is manufactured in multiple sections and the sections are joined on-site. However, in Japan, the hurdles to obtaining design certification, including for the joint between the tower and foundation, are high, and none of these methods have yet achieved design certification.

[0005] Therefore, an object of the present invention is to provide an onshore wind turbine generator and an installation method for an onshore wind turbine generator that can be made larger and taller without the need to increase the diameter of the tower during transportation. [Means for solving the problem]

[0006] In order to achieve the above object, the onshore wind turbine generator of the present invention has a tower supported on the ground, and a concrete lining portion that surrounds the lower side of the tower and is formed integrally with the tower.

[0007] In order to achieve the above-mentioned objective, the construction method for an onshore wind power generation device of the present invention involves erecting a tower on a foundation provided in the ground, and providing a concrete encasing portion around the lower side of the tower so as to be integrated with the tower.

[0008] In the present invention, by providing a concrete lining around the tower, the load concentrated at the bottom end of the tower can be borne not only by the tower but also by the tower and the concrete lining, and can be transmitted from the tower and the concrete lining to the foundation and ground. As a result, in the present invention, the diameter of the tower can be made smaller than in conventional onshore wind power generation devices that support the wind turbine only by the tower. In the present invention, there is no need to make the tower larger in diameter during transportation, and onshore wind power generation devices can be made larger and taller.

[0009] In the onshore wind turbine power generation apparatus according to the present invention, a shear key may be provided around the tower to be embedded in the concrete encasing portion.

[0010] By adopting such a configuration, the concrete lining and the tower can be more firmly integrated. [Effects of the Invention]

[0011] According to the present invention, it is not necessary to increase the diameter of the tower during transportation, and it is possible to increase the size and height of the onshore wind turbine generator. [Brief explanation of the drawings]

[0012] [Figure 1] 3 is a cross-sectional view taken along line AA in FIG. 2, showing the lower side of the onshore wind turbine generator according to the embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line BB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] An onshore wind turbine generator and an installation method for an onshore wind turbine generator according to an embodiment of the present invention will now be described with reference to FIGS. 1 and 2. FIG. As shown in Figures 1 and 2, the onshore wind turbine generator 1 according to this embodiment has a foundation 2, a tower 3, a concrete lining 4, a wind turbine (not shown), and a generator (not shown). The foundation 2 is supported by the ground G. The tower 3 is supported by the foundation 2. The lower end of the tower 3 is connected to the foundation 2. The wind turbine and the generator are attached to the upper end of the tower 3. The wind turbine has multiple blades, and the rotational force of the blades rotated by the wind is input to the generator. The concrete lining 4 surrounds the lower side of the tower 3 and is integrated with the tower 3. The concrete lining 4 is also connected to the foundation 2 and is integrated with the foundation 2.

[0014] The foundation 2 has a regular octagonal shape when viewed from above and below. The foundation 2 is made of reinforced concrete. The top surface 21 of the foundation 2 is flat and is approximately the same height as the ground surface. The foundation 2 has a footing on its outer periphery. The tower 3 is cylindrical. The tower 3 is made of steel.

[0015] The concrete lining section 4 is made of reinforced concrete. This reinforced concrete construction also includes prestressed concrete construction, in which prestress is introduced into the reinforcing bars. The concrete lining section 4 has reinforcing bars 41 that surround the tower 3 and concrete 42 in which the reinforcing bars 41 are embedded. The concrete lining section 4 is installed at a height approximately 20 to 40 meters above the height of the top surface 21 of the foundation section 2.

[0016] A shear key may be provided on the outer periphery of the tower 3 to secure it to the concrete of the concrete lining section 4. By doing so, the concrete lining section 4 and the tower 3 can be more firmly integrated. The repeated load of the wind turbine acts on the concrete lining section 4, which may cause the concrete on the surface of the concrete lining section 4 to spall off. For this reason, in order to prevent the concrete lining section 4 from spalling off, the concrete of the concrete lining section 4 may be made of fiber-reinforced concrete.

[0017] In the construction method for the onshore wind power generation device 1 according to this embodiment, after erecting the tower 3 on the foundation 2, the concrete lining section 4 is constructed around the tower 3. The tower 3 is fabricated in advance in a factory or the like and transported to the site. To construct the concrete lining section 4, for example, reinforcing bars 41 are placed around the tower 3, formwork is installed, and concrete is poured. Once the concrete has hardened, the formwork is removed. The concrete lining section 4 and the tower 3 are integrated, and the concrete lining section 4 and the foundation 2 are also integrated.

[0018] Next, the functions and effects of the onshore wind turbine generator and the onshore wind turbine generator installation method according to this embodiment will be described. In the onshore wind turbine generator and construction method for an onshore wind turbine generator according to this embodiment, the concrete lining 4 is provided around the tower 3, so that the load concentrated at the bottom end of the tower 3 can be borne not only by the tower 3 but also by the tower 3 and the concrete lining 4, and can also be transmitted from the tower 3 and the concrete lining 4 to the foundation 2. As a result, the onshore wind turbine generator 1 according to this embodiment can have a smaller diameter tower 3 than conventional onshore wind turbine generators that support the wind turbine and generator only with the tower. In this embodiment, the onshore wind turbine generator 1 can be made larger and taller without the need to make the tower 3 larger in diameter.

[0019] Even if the onshore wind turbine power generation device 1 is made larger and taller, the diameter of the tower 3 does not increase, so the tower 3 can be transported using conventional transportation methods during construction. In other words, even if there are transportation restrictions, an onshore wind turbine power generation device 1 with a higher power generation capacity can be constructed. By constructing the concrete encasing section 4 on-site so that it surrounds the tower 3, the transportation vehicle can be made smaller than when using a tower with the combined strength of the concrete encasing section 4 and the tower 3, and construction costs can be reduced.

[0020] By providing an appropriate cover for the concrete lining section 4, durability can be improved compared to a steel tower alone. Steel towers require maintenance such as painting, but in this embodiment, the lower side of the tower 3 is transferred to the concrete lining section 4, which reduces the cost and labor required for maintenance. The materials for the concrete lining 4 can generally be procured domestically, which reduces construction costs.

[0021] The above describes embodiments of an onshore wind power generation device and an onshore wind power generation device installation method according to the present invention, but the present invention is not limited to the above embodiments and can be modified as appropriate within the scope of the spirit of the present invention. For example, the shape, height, and reinforcement of the concrete lining section 4 may be set as appropriate. The shapes of the foundation section 2 and the tower 3 may be set as appropriate. For example, the planar shape of the concrete lining section 4 may be a polygon such as an octagon. For example, the concrete lining section 4 may have a tapered shape that increases in size from the top to the bottom.

[0022] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The onshore wind power generation device and the construction method for an onshore wind power generation device according to this embodiment can contribute to achieving one of the 17 SDGs, for example goal 9, "Create indispensable infrastructure for industry, innovation and sustainable development." [Explanation of symbols]

[0023] 1. Onshore wind power generation equipment 2 Foundation part 3. Tower 4 Concrete covering section 41 Reinforced concrete 42 Concrete G Ground

Claims

1. A tower supported by the ground, a concrete lining portion surrounding the lower side of the tower and integrally formed with the tower.

2. The onshore wind power generation apparatus according to claim 1 , wherein a shear key is provided around the tower and embedded in the concrete encasing portion.

3. The tower is built on a foundation in the ground, A construction method for an onshore wind power generation system in which a concrete lining is provided around the lower side of the tower so as to be integrated with the tower.

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