Wind power generation tower and method for constructing wind power generation tower

Abstract

The present invention limits increases in weight of a wind power generation tower and size of a foundation. A wind power generation tower

Description

[Technical Field]

[0001] This invention relates to a wind turbine tower for supporting a wind turbine generator in the air and a method for constructing the wind turbine tower. [Previous Technology]

[0002] In recent years, due to increased awareness of environmental issues, wind power generation, a method of generating electricity from renewable energy sources, has become widely popular in various regions. A wind power generation system consists of a wind turbine with a rotor and nacelle, and a wind turbine tower to support the turbine, built in a location with favorable site conditions that allow for sufficient wind flow. Generally, the higher the location, the greater the wind speed. Therefore, to improve power generation efficiency, the demand for higher-quality wind turbine towers is increasing.

[0003] Regarding wind power towers designed to meet the requirements described above, a hybrid tower for wind power generation is known (Patent Document 1). This hybrid tower has a lower section of the tower column formed as a highly rigid concrete structure, and an upper section formed as a steel structure with excellent workability. Specifically, the lower section of the tower column is constructed of prestressed concrete, and the upper section is constructed of an additional steel cylinder. With this configuration, wind power towers exceeding 70m in height (e.g., 100m) can be achieved.

[0004] The construction method of this hybrid tower consists of a concrete cylinder installation process at the bottom of the tower column, a prestressing introduction process at the bottom of the tower column, and a steel cylinder installation process at the top of the tower column. In the concrete cylinder installation process, inner and outer formwork are assembled on the footing, and concrete is poured into the formwork, thereby vertically constructing the concrete cylinder in sequence. In the prestressing introduction process, PC steel is placed between the fixing part located at the top of the concrete cylinder, which has reached a predetermined length, and the fixing device located in the footing. Because the PC steel is stretched, prestress is introduced into the concrete cylinder. In the steel cylinder installation process, a steel cylinder is vertically attached to the concrete cylinder. [Prior Art Documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2009-57713 [Summary of the Invention]

[0006] [The problem the invention aims to solve]

[0007] However, in the aforementioned prior art, if the height of the concrete structure at the bottom of the tower column is increased to further increase the height of the wind turbine tower, there is a risk that the rigidity of the concrete structure will be insufficient. To address this rigidity issue, it is considered to increase the cross-sectional shape of the concrete structure towards the bottom. However, if the structure is formed as described above, the volume and weight of the concrete structure become very large. Consequently, the base supporting the wind turbine tower must also be made larger.

[0008] Furthermore, in the aforementioned conventional technology, the wind turbine tower is constructed sequentially from bottom to top. Therefore, in order to install the steel cylinder at the top of the tower column, or to install the wind turbine mounted on it, a crane taller than the wind turbine tower is required. Therefore, the height of the wind turbine tower is limited by the height of the crane.

[0009] In view of the above background, the present invention addresses the problem of reducing the weight of wind turbine towers or the size of their foundations, and of constructing wind turbine towers without being limited by the height of cranes. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, one aspect of the present invention is a wind power generation tower (5), which is a wind power generation tower for supporting a wind turbine (4) in the air, comprising: a lower part (11) of the tower column having at least three hollow concrete legs (14) erected on a base (8) in an inclined manner toward each other; a middle part (12) of the tower column, which is the middle part (12) of the tower column arranged in the center of the at least three aforementioned legs (14) when viewed from above, and having The lower end (12a) of the aforementioned foot (14) and the upper end (12b) which is thinner than the aforementioned lower end (12a) are made of conical hollow concrete; and the upper part (13) of the tower column protrudes upward from the middle part (12) of the aforementioned tower column, supports the aforementioned wind turbine (4), and is composed of a steel pipe having a lower half (13a) of the aforementioned upper end (12b) supported on the middle part (12) of the aforementioned tower column and an exposed body part (13b).

[0011] Here, "concrete structure" means a structure that includes concrete, not that it is composed of concrete alone. Therefore, concrete structures include: reinforced concrete structures, fiber-reinforced concrete structures, reinforced steel-reinforced concrete structures, prestressed concrete structures, precast concrete structures, and in-situ cast concrete structures, etc.

[0012] With this design, since the lower and middle parts of the tower are made of hollow concrete, the required rigidity of the wind turbine tower can be easily ensured, thus increasing the height of the wind turbine tower. Furthermore, since the lower part of the tower has at least three hollow concrete legs, the amount of concrete in the lower part of the tower can be reduced, and the weight of the wind turbine tower or the size of the base can be prevented. In particular, since the upper part of the tower is constructed of steel pipes, the required flexural performance of the wind turbine tower can be easily ensured.

[0013] In the above configuration, if the aforementioned tower column middle part (12) has at least three flat surfaces (17) formed at equal intervals on the outer peripheral surface of the aforementioned lower end (12a) in the circumferential direction, and each of the aforementioned foot parts (14) has a flat joint surface (18) facing the aforementioned tower column middle part (12), then the aforementioned joint surface (18) can be fastened to the aforementioned tower column middle part (12) by means of the tension member (20) in a state where the aforementioned joint surface (18) faces the corresponding aforementioned flat surface (17).

[0014] This configuration allows the middle and base of the tower column to be securely fastened.

[0015] In the above-described state, a filler material (19) may be filled between the aforementioned joint surface (18) of the aforementioned foot (14) and the aforementioned flat surface (17) of the aforementioned tower middle part (12).

[0016] With this configuration, gaps caused by manufacturing or construction errors can be filled with filler material, and the gaps can be secured while the feet are in close contact with the middle of the tower column.

[0017] In the above configuration, the wind power tower (5) may further include: a support member (15) that can rotatably support the aforementioned foot (14) on the aforementioned base (8).

[0018] Because of this configuration, the feet can rotate, making it easier to connect the feet to the middle of the tower column.

[0019] In addition, to solve the above-mentioned problems, one aspect of the present invention is a method for constructing a wind power generation tower, which is a method for constructing the wind power generation tower (5) of the above-mentioned aspect, comprising the following steps: constructing the upper part (13) and the middle part (12) of the aforementioned tower column in the area (21) to be surrounded by the aforementioned foot (14) (Figs. 4(B)~(C)); making the upper part (13) of the aforementioned tower column support the aforementioned wind turbine (4) (Fig. 4(B)); constructing at least 3 of the aforementioned foot (14) in a generally vertical direction upward (Fig. 5(D)); and placing the upper part (13) of the aforementioned tower column supporting the aforementioned wind turbine (4) 13) and the aforementioned tower column middle (12) is raised to a predetermined upper position (Fig. 5(F)); and at least three of the aforementioned legs (14) are rotated on the aforementioned base (8) and tilted toward each other, and the upper part (14b) of the aforementioned legs (14) abuts against the aforementioned lower end (12a) of the aforementioned tower column middle (12) located in the aforementioned upper position (Fig. 6(G)); and each of the aforementioned upper parts (14b) of the aforementioned legs (14) is joined to the aforementioned lower end (12a) of the aforementioned tower column middle (12), so that the aforementioned lower part (11) of the tower column supports the aforementioned tower column middle (12) (Fig. 6(H)).

[0020] In this configuration, the wind turbine is supported on the upper part of the tower before the upper and middle parts of the tower are lifted up to a predetermined overhead position. Therefore, it is not necessary to use a crane taller than the wind turbine tower to install the upper part of the tower or the wind turbine. Therefore, the wind turbine tower can be constructed without being limited by the height of the crane.

[0021] In the above-described configuration, the construction method may further include the following steps: before raising the aforementioned upper part (13) and the aforementioned middle part (12) of the tower column to the aforementioned upper position, installing a counterweight (24) at the aforementioned lower end (12a) of the aforementioned middle part (12) of the tower column (Fig. 5(E)); and after attaching each of the aforementioned upper part (14b) of the aforementioned foot (14) to the aforementioned lower end (12a) of the aforementioned middle part (12) of the tower column, removing the aforementioned counterweight (24) from the aforementioned lower end (12a) of the aforementioned middle part (12) of the tower column (Fig. 6(I)).

[0022] By means of this state, when the upper part and the middle part of the tower are raised to the upper position, the posture of the upper part and the middle part of the tower can be stabilized.

[0023] In the above-described configuration, in the steps of constructing the upper part (13) and the middle part (12) of the aforementioned tower column (Figures 4(B)~(C)), the nacelle (3) of the aforementioned wind turbine generator (4) is arranged, and the upper part (13) and the middle part (12) of the aforementioned tower column are constructed by lifting them from above in sequence below the aforementioned nacelle (3).

[0024] This configuration allows for lower-level configuration of the nacelle and assembly of the nacelle with the upper part of the tower. Therefore, there is no need to prepare a large crane with a high lifting capacity, reducing construction costs. [Effects of the Invention]

[0025] By adopting the above-mentioned design, the weight of wind power towers or the size of the base can be suppressed, and wind power towers can be constructed without being limited by the height of the crane.

Implementation Method

[0027] The embodiments of the present invention will now be described in detail with reference to the drawings.

[0028] Figure 1 is a side view of the wind power generation device 1 according to an embodiment. As shown in Figure 1, the wind power generation device 1 includes: a wind turbine 4 having a rotor 2 and a nacelle 3, and a wind power generation tower 5 for supporting the wind turbine 4 in the air. The wind power generation device 1 of this embodiment is configured as an onshore wind power generation facility constructed on land. In other examples, the wind power generation device 1 may also be configured as a bottom-fixed offshore wind power generation facility constructed at sea.

[0029] The rotor 2 includes a hub 6 having a horizontal axis and a plurality of blades 7 extending radially from the hub 6 and arranged around the axis of the hub 6. The rotor 2 rotates around the axis of the hub 6 due to wind force on the blades 7. The nacelle 3 rotatably supports the rotor 2 around its axis. The nacelle 3 contains a speed increaser connected to the rotor 2 on the input side and a generator connected to the output side of the speed increaser. When the rotor 2 rotates, the nacelle 3 increases the rotational speed using the speed increaser and generates electricity using the generator.

[0030] Figure 2 is a cross-sectional view along line II-II in Figure 1. As shown in Figures 1 and 2, the wind power generation unit 1 is built on a base 8 (support structure) constructed on the foundation G. The base 8 includes three feet 9. The three feet 9 are arranged at equal intervals (120° intervals) around the wind power generation tower 5 in a radial direction from the center 5X when viewed from above. These three feet 9 can also be connected to each other by ground beams (not shown).

[0031] The wind power tower 5 includes: a lower part 11 of the tower column supported by the base 8; a middle part 12 of the tower column supported by the lower part 11; and an upper part 13 of the tower column supported by the middle part 12 and supporting the wind turbine 4.

[0032] The lower part 11 of the tower column has three hollow concrete legs 14 erected on the base 9 in an inclined manner toward each other. That is, the lower part 11 of the tower column is formed into a tripod by the three legs 14. Each leg 14 has a base body 14a inclined relative to the vertical line, and an upper leg part 14b extending upward from the upper end of the base body 14a and extending approximately vertically.

[0033] A support member 15 is provided at the lower end of each foot 14. In this embodiment, the support member 15 is embedded in concrete, forming an extension that causes the foot 14 to extend downward. In other embodiments, the support member 15 may be exposed and not embedded in concrete.

[0034] The support member 15 is a rotating support member that rotatably supports the foot 14 on the base 8 before it is embedded in concrete. The support member 15 has a rotation axis 15X extending in a horizontal direction. The support member 15 is positioned at a right angle to an imaginary line 16 extending from the center 5X of the wind turbine tower 5 toward the support member 15. As shown above, the foot 14 is rotatably supported by the support member 15 about the rotation axis 15X, thereby allowing the upper part to tilt in a direction close to and away from the center 5X of the wind turbine tower 5.

[0035] The central section 12 of the tower column is positioned at the center of the three legs 14 when viewed from above. The central section 12 of the tower column is formed as a conical hollow concrete structure, having a lower end 12a supported by the legs 14 and an upper end 12b that is thinner than the lower end 12a. In Figure 2, the outer contour of the lower end 12a of the central section 12 of the tower column projected vertically downwards from above is represented by an imaginary line.

[0036] Figure 3 is a cross-sectional view along line III-III in Figure 1. As shown in Figures 1 and 3, the central section 12 of the tower column has three flat surfaces 17 evenly spaced in the circumferential direction on the outer peripheral surface of the lower end 12a. Each foot 14 has a flat mating surface 18 facing the central section 12 at its upper part 14b. The upper part 14b is configured such that the mating surface 18 faces the corresponding flat surface 17. A filler material 19 is filled between the mating surface 18 of the foot 14 and the flat surface 17 of the central section 12. The filler material 19 is a filler material with hardening and fluidity that hardens over time, such as non-shrink cement mortar. The upper part 14b is fastened to the central section 12 by a tension member 20 with the mating surface 18 facing the corresponding flat surface 17 through the filler material 19. The tension member 20 may also be, for example, a plurality of post tension bars (PT bars) made of copper rods.

[0037] As shown in Figure 1, the upper part 13 of the tower is constructed of steel pipe and is configured to protrude upward from the middle part 12 of the tower. The upper part 13 of the tower has: a lower half 13a supported on the upper end 12b of the middle part 12 of the tower, and a main body 13b exposed between the middle part 12 of the tower and the nacelle 3. The lower half 13a of the upper part 13 refers to the portion that surrounds the entire circumference of the middle part 12 of the tower, extending vertically within the middle part 12 of the tower for a predetermined height. The upper part 13 of the tower is rigidly connected to the middle part 12 of the tower by means of the lower half 13a being connected to the upper end 12b of the middle part 12 of the tower. The main body 13b of the upper part 13 of the tower extends upward from the middle part 12 of the tower for a predetermined height and is the least rigid and easily flexed part of the wind power tower 5. Furthermore, the exposed body portion 13b of the upper part 13 of the tower column functions as a heat-releasing part that dissipates the heat of the cabin 3 into the atmosphere.

[0038] The wind turbine tower 5 is configured as shown above. In this way, the height of the wind turbine tower 5 can be increased while preventing the wind turbine tower 5 from becoming too heavy or the base 8 from becoming too large.

[0039] Specifically, by forming the lower part 11 and the middle part 12 of the tower column into hollow concrete, the required rigidity of the wind power tower 5 can be easily ensured, thus increasing the height of the wind power tower 5. Furthermore, the lower part 11 has three hollow concrete legs 14, thus reducing the amount of concrete in the lower part 11 and preventing the wind power tower 5 from becoming too heavy or the base 8 from becoming too large. Moreover, since the lower part 11 is composed of three legs 14, the legs 14 can be easily connected to the middle part 12 of the tower column in a way that evenly supports the load. In particular, since the upper part 13 of the tower column is made of steel pipe, the required flexural performance of the wind power tower 5 can be easily ensured.

[0040] The wind turbine tower 5 in this embodiment is not limited to this, and can be configured with the following dimensions. The height of the wind turbine tower 5 (from the upper surface of the base 8 to the lower surface of the nacelle 3) can be 100m or more, for example, 220m. The height of the lower part 11 and the middle part 12 of the tower column (from the upper surface of the base 8 to the upper end 12b of the middle part 12 of the tower column) can be 90m or more, for example, 200m. In this case, the height of the exposed body part 13b of the upper part 13 of the tower column can be 10 to 25m. The height of the upper part 13 of the tower column can be 15 to 50m.

[0041] The height of the middle section 12 of the tower column can be 60-140m, and the height of the lower end 12a of the middle section 12 supported by the foot 14 can be 10-30m. The height of the lower part 11 of the tower column can be 50-120m. The height of the foot body 14a can be 40-100m, and the height of the upper part 14b can be 10-30m. The diameter of the lower end 12a of the middle section 12 can be 7.5-17.5m, and the diameter of the upper end 12b of the middle section 12 is smaller than the diameter of the lower end 12a, and can be 5-12m. The radius of the lower part 11 of the tower column (from the center 5X of the wind power tower 5 to the center of the lower end of each foot 14) can be 12-30m.

[0042] Furthermore, the rotor 2 is not limited to this; for example, its radius may be 50 to 120 m.

[0043] As shown in FIG. 3, the middle section 12 of the tower column has three flat surfaces 17 equally spaced in the circumferential direction on the outer peripheral surface of the lower end 12a. Each of the legs 14 has a flat mating surface 18 facing the middle section 12 of the tower column, and is fastened by a tension member 20 with the mating surface 18 facing the corresponding flat surface 17. In this way, the middle section 12 of the tower column and the legs 14 are securely fastened.

[0044] Furthermore, a filler material 19 is used to fill the space between the mating surface 18 of the foot 14 and the flat surface 17 of the tower column 12. Therefore, gaps caused by manufacturing or construction errors are filled by the filler material 19, and the foot 14 and the tower column 12 are secured in close contact.

[0045] As shown in Figure 2, the wind power tower 5 is equipped with a support member 15 that can rotatably support the foot 14 on the base 8. This allows the foot 14 to rotate, making it easier to connect the foot 14 to the middle section 12 of the tower column. This will be explained later.

[0046] Next, the construction method of the wind power generation device 1 in the embodiment will be described.

[0047] Figures 4-6 are explanatory diagrams of the construction sequence of the wind power generation device 1 in the embodiment. The wind power generation device 1 is constructed by the operator in the following sequence. As shown in Figure 4(A), the operator first constructs a base 8 containing three feet 9 at a predetermined location on the site G. In addition, in the area 21 to be surrounded by the feet 14 (see Figure 2), a lifting platform 22 for constructing the upper part 13 and the middle part 12 of the tower is assembled. As shown in Figure 2, the lifting platform 22 is located on the outer periphery of the lower end 12a of the middle part 12 of the tower, which has the largest cross-sectional dimension. The lifting platform 22 is assembled at the bottom and extends upward at the appropriate time. At least the upper part of the lifting platform 22 is assembled in a position around the center 5X of the wind power generation tower 5 (circumferential direction) that does not overlap with the three feet 14.

[0048] Next, as shown in Figure 4(B), using crane 23, the nacelle 3 is positioned on the lifting platform 22, and the upper part of the tower column 13 is erected on the chassis G. The configuration of the nacelle 3 and the upper part of the tower column 13 can be performed either first. After the nacelle 3 and the upper part of the tower column 13 are configured, the lower surface of the nacelle 3 is joined to the upper end of the upper part of the tower column 13, thus supporting the nacelle 3 on the upper part of the tower column 13.

[0049] Subsequently, as shown in FIG4(C), on the chassis G below the nacelle 3, the middle part 12 of the tower column is jacked up sequentially from above in a manner that is combined with the lower half 13a of the upper part 13 of the tower column. Once the nacelle 3 is jacked up to a predetermined height, the rotor 2, including the blades 7, is installed in the nacelle 3.

[0050] As shown above, in the steps of constructing the upper part 13 and the middle part 12 of the tower column (Figures 4(B)~(C)), the upper part 13 and the middle part 12 of the tower column are constructed sequentially from top to bottom below the nacelle 3. This allows for the configuration of the nacelle 3 and the connection between the nacelle 3 and the upper part 13 of the tower column to be performed at a lower position. Therefore, it is not necessary to prepare a large crane with a large lifting capacity, reducing construction costs.

[0051] As shown in Figure 5(D), three legs 14 are constructed approximately vertically upwards on three bases 9. Specifically, support members 15 are arranged on the bases 9 for fixation. The support members 15 can be fixed by locking members if their upper surfaces form a horizontal angle. In this state, the foot body 14a of the legs 14 is constructed vertically on the support members 15. If necessary, to prevent the constructed foot body 14a from inverting, the foot body 14a can be restrained by support cables. The legs 14 can be constructed by sequentially stacking, for example, hollow precast concrete members using a crane 23, and then joining them together by the tension of the PC tensile material. In other embodiments, the legs 14 can also be constructed by pouring concrete in situ.

[0052] At this stage, as shown in FIG5(D), only the vertically constructible base body 14a may be constructed, or the entire foot 14 may be constructed. Alternatively, as shown in FIG5(E), only the lower part of the upper foot 14b may be constructed for oblique construction, except for the base body 14a. In this embodiment, at this stage, the base body 14a and the lower part of the upper foot 14b are constructed. The construction of the foot 14 shown in FIG5(D) can be carried out at any time after the base 9 is constructed, and does not need to be carried out after FIG4(C).

[0053] After constructing the middle section 12 of the tower column as shown in Figure 4(C), a counterweight 24 is installed at the lower end 12a of the middle section 12 of the tower column, as shown in Figure 5(E). Then, as shown in Figure 5(F), the upper section 13 and the middle section 12 of the tower column supporting the wind turbine 4 are lifted up to a predetermined overhead position using a lifting platform 22. The predetermined overhead position is the position configured in the completed wind turbine tower 5 shown in Figure 1.

[0054] As shown above, in Figure 5(E), a counterweight 24 is installed at the lower end 12a of the middle part 12 of the tower column. Therefore, when the upper part 13 and the middle part 12 of the tower column are raised to the upper position in Figure 5(F), the posture of the upper part 13 and the middle part 12 of the tower column is stable.

[0055] Next, as shown in FIG6(G), the three legs 14 are rotated on the base 8 and lowered towards each other, so that the upper part 14b of the legs abuts against the lower end 12a of the tower column 12 located in the upper position. Then, as shown in FIG6(H), the upper parts 14b of the legs are joined to the lower end 12a of the tower column 12 using the tension member 20, so that the lower part 11 of the tower column supports the tower column 12. Specifically, the unconstructed part is constructed on the completed part of the legs 14. Next, as shown in FIG3, the filler material 19 is filled between the joint surface 18 of the legs 14 and the flat surface 17 of the tower column 12. After the filler material 19 hardens, with the joint surface 18 of the foot 14 facing the flat surface 17 of the corresponding tower column middle part 12 through the filler material 19, the upper part 14b of the foot 14 is fastened to the lower end 12a of the tower column middle part 12 by the tension member 20.

[0056] As described above, since the wind power tower 5 has a support member 15, the rotation of the foot 14 shown in FIG. 6(G) becomes easier, and it is easier to perform the operation of connecting the foot 14 with the middle part 12 of the tower column.

[0057] Finally, as shown in Figure 6(I), the counterweight 24 is removed from the lower end 12a of the middle section 12 of the tower column. Furthermore, the lifting platform 22 is dismantled. In this embodiment, concrete is poured at the lower end of the foot 14, and the supporting member 15 is embedded in the concrete. Thus, the wind power generation device 1 shown in Figure 1 is constructed.

[0058] As shown above, in the construction method of the embodiment, before raising the upper part 13 and the middle part 12 of the tower to the predetermined overhead position in Figure 5(F), the wind turbine 4 is supported on the upper part 13 of the tower as shown in Figure 4(B). Therefore, it is not necessary to prepare a large crane taller than the wind turbine tower 5 in order to install the upper part 13 of the tower or the wind turbine 4. Therefore, the wind turbine tower 5 can be constructed without being limited by the height of the crane.

[0059] The description of the specific embodiments concludes above. However, the present invention is not limited to the above embodiments or modifications and can be implemented in a wide range of variations. For example, in the above embodiments, the lower part 11 of the tower column has three legs 14, but it may also have four or more legs 14. Furthermore, without departing from the spirit of the present invention, the specific composition or arrangement, quantity, angle, material, order, etc., of each component or part can be appropriately changed. On the other hand, not all of the constituent elements shown in the above embodiments are necessary and can be appropriately selected. [Simplified Explanation of the Diagram]

[0026] Figure 1 is a side view of the wind power generation device in the embodiment. Figure 2 is a cross-sectional view along line II-II in Figure 1. Figure 3 is a cross-sectional view along line III-III in Figure 1. Figure 4 is an explanatory diagram of the construction sequence of the wind power generation device in the embodiment. Figure 5 is an explanatory diagram of the construction sequence of the wind power generation device in the embodiment. Figure 6 is an explanatory diagram of the construction sequence of the wind power generation device in the embodiment.

Claims

1. A wind power generation tower for supporting a wind turbine generator in the air, comprising: a lower part of the tower column having at least three hollow concrete legs erected on a base in an inclined manner toward each other; a middle part of the tower column, which, when viewed from above, is disposed in the center of the at least three legs and is made of conical hollow concrete having a lower end supported on the legs and an upper end that is thinner than the lower end; and an upper part of the tower column, which protrudes upward from the middle part of the tower column to support the wind turbine generator and is composed of a steel pipe having a lower half supported on the upper end of the middle part of the tower column and an exposed body portion.

2. The wind power tower of claim 1, wherein the middle part of the tower column has at least three flat surfaces formed at equal intervals in the circumferential direction on the outer peripheral surface of the lower end, and each of the aforementioned feet has a flat joint surface facing the middle part of the tower column, and is fastened to the middle part of the tower column by means of a tension member when the aforementioned joint surface is facing the corresponding aforementioned flat surface.

3. The wind power tower of claim 2, wherein a filler material is filled between the aforementioned joint surface of the aforementioned foot and the aforementioned flat surface of the aforementioned tower column.

4. The wind power tower of any one of claims 1 to 3 further comprises: a support member that can rotatably support the aforementioned feet on the aforementioned base.

5. A method for constructing a wind power tower, as described in any one of claims 1 to 4, comprising the following steps: constructing an upper part and a middle part of the tower column in an area to be surrounded by the aforementioned legs; supporting the aforementioned wind turbine on the upper part of the tower column; constructing at least three of the aforementioned legs substantially vertically upwards; raising the aforementioned upper part and the aforementioned middle part of the tower column supporting the aforementioned wind turbine to a predetermined overhead position; and rotating the at least three aforementioned legs on the aforementioned base to tilt them toward each other, with the upper part of the aforementioned legs abutting against the aforementioned lower end of the aforementioned middle part of the tower column located at the aforementioned overhead position; and attaching the aforementioned upper parts of the aforementioned legs to the aforementioned lower end of the aforementioned middle part of the tower column, so that the lower part of the tower column supports the aforementioned middle part of the tower column.

6. The method of constructing a wind power tower as claimed in claim 5 further includes the following steps: before raising the upper part and the middle part of the tower to the aforementioned above-ground position, installing a counterweight at the aforementioned lower end of the middle part of the tower; and after attaching the aforementioned upper parts of the aforementioned feet to the aforementioned lower end of the middle part of the tower, removing the aforementioned counterweight from the aforementioned lower end of the middle part of the tower.

7. The method for constructing a wind power tower as claimed in claim 6, wherein in the steps of constructing the upper part and the middle part of the aforementioned tower column, the nacelle of the aforementioned wind turbine is arranged, and the upper part and the middle part of the aforementioned tower column are constructed by sequentially lifting them from above below the aforementioned nacelle.

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