A capacity expansion and conversion device and a local reinforcement method for a wind turbine tower.

Abstract

This invention discloses a capacity expansion and conversion device and a local reinforcement method for a wind turbine generator tower, relating to the wind power field. The capacity expansion and conversion device includes: an original reinforced concrete foundation and a capacity expansion and conversion mechanism; the original reinforced concrete foundation includes: the original column pier, the original foundation ring, and the original upper flange connecting bolts; the capacity expansion and conversion mechanism includes: a newly poured reinforced concrete foundation, a capacity expansion and conversion tower, external steel supports, an upper connector, a lower connector, an upper connecting flange, and a lower connecting flange; wherein, the external steel supports are connected to the capacity expansion and conversion tower via the upper connector and to the newly poured reinforced concrete foundation via the lower connector; the bottom diameter of the capacity expansion and conversion tower is the same as the top diameter of the original foundation ring, and the diameter of the capacity expansion and conversion tower gradually increases along the height direction, remaining constant after reaching the design diameter. This invention can solve the problems of incompatibility between the replacement tower of the wind turbine generator and the lower foundation, and the insufficient bearing capacity of the lower foundation due to the increased load of the wind turbine generator tower expansion.

Description

Technical Field

[0001] This invention relates to the field of wind power, and in particular to a capacity expansion and conversion device and a method for local reinforcement of a wind turbine tower. Background Technology

[0002] In recent years, with the development of the national economy and the progress of society, the demand for electricity has increased significantly, and the existing wind power generation capacity needs to be improved. To increase the power generation of wind turbine generators, it is necessary to increase the power output of the turbine generators, the volume of the rotor, and the cross-sectional dimensions of the tower supporting the turbine generators. However, for existing wind turbine generators, simply replacing the upper tower and the turbine generator section will result in a mismatch between the connection diameter of the tower and the lower foundation ring. Furthermore, the bearing capacity of the existing lower foundation is designed based on the original turbine generator load and may not be able to withstand the increased load of the new turbine generator. On the other hand, demolishing the existing lower foundation would involve an enormous amount of engineering work. Summary of the Invention

[0003] The purpose of this invention is to provide a capacity expansion and conversion device and a local reinforcement method for wind turbine generator towers, so as to solve the problems of incompatibility between the replacement tower and the lower foundation, and insufficient bearing capacity of the lower foundation due to the increased capacity load of the wind turbine generator tower.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] An expansion and conversion device for a wind turbine tower, the expansion and conversion device comprising: an original reinforced concrete foundation and an expansion and conversion mechanism;

[0006] The original reinforced concrete foundation includes: the original column pier, the original foundation ring, and the original upper flange connecting bolts; the original foundation ring is partially embedded in the original column pier.

[0007] The expansion and conversion mechanism includes: a newly poured reinforced concrete foundation, an expansion and conversion tower, external steel supports, an upper connector, a lower connector, an upper connecting flange, and a lower connecting flange. The newly poured reinforced concrete foundation is located on the surface of the original reinforced concrete foundation, and the portion of the original foundation ring not embedded in the original column pier is embedded in the newly poured reinforced concrete foundation. The bottom of the expansion and conversion tower is connected to the top of the original foundation ring via bolts from the original upper flange. The external steel supports are connected to the expansion and conversion tower via the upper connector and to the newly poured reinforced concrete foundation via the lower connector, for fixing the newly poured reinforced concrete foundation and the expansion and conversion tower. The upper connecting flange is located at the top of the expansion and conversion tower for connecting the expanded wind turbine generator set. The lower connecting flange is located at the bottom of the expansion and conversion tower for connecting the original foundation ring. The bottom diameter of the expansion and conversion tower is the same as the top diameter of the original foundation ring, and the diameter of the expansion and conversion tower gradually increases along the height direction, remaining constant after reaching the design diameter.

[0008] Optionally, the expansion and conversion mechanism further includes: an outer cylinder wall stiffening rib; the outer cylinder wall stiffening rib is located at the variable diameter inclined section of the expansion and conversion tower, and is used to construct a node reinforcement area at the variable diameter inclined section of the expansion and conversion tower.

[0009] Optionally, the expansion and conversion mechanism further includes: an inner connecting steel plate, inner stiffening ribs, and ground anchor bolts; the inner connecting steel plate is located in the portion of the original foundation ring not embedded in the original column pier; the inner connecting steel plate is composed of a ring-shaped top surface, a ring-shaped bottom surface, and a ring-shaped side surface connected at right angles, and the ring-shaped top surface is connected to the top of the original foundation ring, the ring-shaped bottom surface is connected to the top of the original column pier through the ground anchor bolts, and the ring-shaped side surface is connected to the inner wall of the original foundation ring; the inner stiffening ribs are mechanically connected to the inner connecting steel plate; the newly poured reinforced concrete foundation, the inner connecting steel plate, and the inner stiffening ribs are used to strengthen the rigidity of the portion of the original foundation ring not embedded in the original column pier.

[0010] Optionally, the original reinforced concrete foundation further includes: the original foundation base slab; the original foundation base slab is located at the bottom of the original column pier.

[0011] Optionally, there are several upper connecting members; the several upper connecting members are distributed circumferentially along the expansion conversion tower and welded to the reduced diameter position of the expansion conversion tower.

[0012] Optionally, there are several lower connectors; the several lower connectors are distributed circumferentially along the upper surface of the newly poured reinforced concrete foundation and are pre-embedded in the newly poured reinforced concrete foundation.

[0013] Optionally, there are several external steel supports; the several external steel supports are distributed circumferentially along the expansion conversion tower.

[0014] Optionally, the newly poured reinforced concrete foundation can be obtained by roughening the surface of the original reinforced concrete foundation, inserting a set number of connecting steel bars according to the structural design, and then pouring the concrete.

[0015] Optionally, the external steel support is a replaceable component or a buckling-resistance support component, and the cross-section used is angle steel, I-beam, rectangular tube or round tube.

[0016] A method for local reinforcement of a wind turbine generator tower, the method being used to construct an expansion and conversion device for the aforementioned wind turbine generator tower, the method comprising:

[0017] Based on the existing operating conditions of the wind turbine generator set, the design data of the original reinforced concrete foundation, and the required bearing capacity and operating conditions after the expansion, the design of the newly poured reinforced concrete foundation and the expansion conversion mechanism is carried out. The diameter and quantity of the reinforcement in the newly poured reinforced concrete foundation, the design diameter of the expansion conversion tower, the cross-sectional size of the external steel support, the dimensions of the upper and lower connectors, and the cross-sectional dimensions of the stiffening ribs of the outer cylinder wall, the internal connecting steel plate, and the internal stiffening ribs are determined.

[0018] Roughen the surface of the original reinforced concrete foundation, drill holes at the interface between the newly poured reinforced concrete foundation and the original reinforced concrete foundation, and insert connecting steel bars.

[0019] Prefabricate the expansion conversion tower, external steel support, upper connector and lower connector, and weld stiffening ribs on the outer wall at the variable diameter inclined section of the expansion conversion tower;

[0020] Pour a new reinforced concrete foundation and pre-embed connectors along the circumferential direction on the surface of the new reinforced concrete foundation.

[0021] After the newly poured reinforced concrete foundation has been cured, the original tower will be replaced with an expansion and conversion tower. The expansion and conversion tower will be connected to the original foundation ring using the original upper flange connecting bolts. The external steel support will be connected to the upper and lower connecting parts using high-strength bolts or welding. The internal connecting steel plate will be mechanically connected to the internal stiffening ribs to form the expansion and conversion device of the wind turbine generator tower.

[0022] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0023] The wind turbine tower expansion and conversion device provided by this invention, by designing an expansion and conversion tower with a bottom diameter consistent with the top diameter of the original foundation ring and a diameter that gradually increases along the height direction, can be applied to wind turbine tower expansion applications, effectively solving the problem of inconsistent diameters between the upper tower and the lower foundation ring. Simultaneously, external steel supports are used to fix the expansion and conversion tower to the newly poured reinforced concrete foundation. These external steel supports can bear a portion of the upper load on the expansion and conversion tower along the circumferential direction and transmit it to the lower newly poured reinforced concrete foundation through the lower connector. This significantly improves the stability of the expanded wind turbine and effectively solves the problem of insufficient bearing capacity of the existing foundation due to the increased tower cross-sectional size caused by the increased power generation of the wind turbine. It has excellent operability and significant economic value. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the reinforced concrete foundation and tower connection without the expansion conversion device;

[0026] Figure 2 This is a schematic diagram of the reinforced concrete foundation and tower connection using the capacity expansion and conversion device;

[0027] Figure 3 A cross-sectional schematic diagram of the capacity expansion and conversion mechanism provided by the present invention;

[0028] Figure 4 This is a top view schematic diagram of the capacity expansion and conversion mechanism provided by the present invention;

[0029] Figure 5 This is a cross-sectional schematic diagram of the capacity expansion and conversion mechanism provided by the present invention.

[0030] Symbol explanation:

[0031] Original reinforced concrete foundation-1, original foundation slab-2, original column pier-3, original foundation ring-4, original upper flange connecting bolts-5, original tower-6, newly poured reinforced concrete foundation-7, expansion and conversion tower-8, external steel support-9, upper connector-10, lower connector-11, upper connecting flange-12, lower connecting flange-13, outer cylinder wall stiffening rib-14, inner connecting steel plate-15, inner stiffening rib-16, ground anchor bolt-17. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The purpose of this invention is to provide a capacity expansion and conversion device and a local reinforcement method for wind turbine generator towers, so as to solve the problems of incompatibility between the replacement tower and the lower foundation, and insufficient bearing capacity of the lower foundation due to the increased capacity load of the wind turbine generator tower.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The wind turbine tower expansion and conversion device provided by the present invention includes: the original reinforced concrete foundation of the wind turbine and the expansion and conversion mechanism.

[0036] Figure 1 This is a schematic diagram of the reinforced concrete foundation and tower connection without the use of a capacity expansion and conversion device. Figure 1 As shown, the original reinforced concrete foundation 1 includes: the original column pier 3, the original foundation ring 4, and the original upper flange connecting bolts 5; wherein, part of the original foundation ring 4 (specifically the lower part) is embedded in the original column pier 3.

[0037] Furthermore, the original reinforced concrete foundation 1 also includes: the original foundation base slab 2; the original foundation base slab 2 is located at the bottom of the original column pier 3. Without the expansion and conversion device, the top of the original foundation ring 4 is connected to the original tower 6.

[0038] Figure 2 This is a schematic diagram of the reinforced concrete foundation and tower connection using the capacity expansion and conversion device. Figures 3 to 5 These are, respectively, a cross-sectional view, a top view, and a sectional view of the capacity expansion and conversion mechanism. For example... Figures 2 to 5As shown, the expansion and conversion mechanism includes: a newly poured reinforced concrete foundation 7, an expansion and conversion tower 8, an external steel support 9, an upper connector 10, a lower connector 11, an upper connecting flange 12, and a lower connecting flange 13. The newly poured reinforced concrete foundation 7 is located on the upper surface of the original reinforced concrete foundation 1, and the portion of the original foundation ring 4 that is not embedded in the original column pier 3 (specifically the upper part) is embedded in the newly poured reinforced concrete foundation 7. The original tower 6 is replaced with an expansion conversion tower 8, and the bottom of the expansion conversion tower 8 is connected to the top of the original foundation ring 4 through the original upper flange connecting bolts 5. The external steel support 9 is connected to the expansion conversion tower 8 through the upper connector 10 and to the newly poured reinforced concrete foundation 7 through the lower connector 11, for fixing the newly poured reinforced concrete foundation 7 and the expansion conversion tower 8. The upper connecting flange 12 is located at the top of the expansion conversion tower 8 for connecting the expanded wind turbine generator set. The lower connecting flange 13 is located at the bottom of the expansion conversion tower 8 for connecting the original foundation ring 4. The bottom diameter of the expansion conversion tower 8 is the same as the top diameter of the original foundation ring 4, and the diameter of the expansion conversion tower 8 gradually increases along the height direction, remaining unchanged after reaching the design diameter.

[0039] Preferably, the newly poured reinforced concrete foundation 7 is obtained by roughening the surface of the original reinforced concrete foundation 1, inserting a set number of connecting steel bars according to the structural design, and then pouring the concrete.

[0040] Furthermore, the expansion and conversion mechanism also includes: an outer cylinder wall stiffening rib 14; the outer cylinder wall stiffening rib 14 is located at the variable diameter inclined section position of the expansion and conversion tower 8, and is used to construct a node reinforcement area at the variable diameter inclined section position of the expansion and conversion tower 8.

[0041] Specifically, the expansion conversion tower 8 is equipped with outer wall stiffening ribs 14 of designed thickness at the diameter-changing parts as the diameter increases, so as to provide a certain degree of node stiffness enhancement to the expansion conversion tower 8.

[0042] Furthermore, the expansion and conversion mechanism also includes: an inner connecting steel plate 15, an inner stiffening rib 16, and a ground anchor bolt 17; the inner connecting steel plate 15 is located in the portion of the original foundation ring 4 not embedded in the original column pier 3; the inner connecting steel plate 15 is composed of a ring top surface, a ring bottom surface, and a ring side surface connected at right angles, and the ring top surface is connected to the top of the original foundation ring 4, the ring bottom surface is connected to the top of the original column pier 3 through the ground anchor bolt 17, and the ring side surface is connected to the inner wall of the original foundation ring 4; the inner stiffening rib 16 is mechanically connected to the inner connecting steel plate 15; the newly poured reinforced concrete foundation 7, the inner connecting steel plate 15, and the inner stiffening rib 16 are used to strengthen the rigidity of the portion of the original foundation ring 4 not embedded in the original column pier 3.

[0043] Specifically, a new reinforced concrete foundation 7 is poured on the outer wall of the original foundation ring 4 up to its top surface. The inner wall of the original foundation ring 4 is tightened with the inner connecting steel plate 15. The upper part is connected to the original upper flange with bolts 5 by tapping. The lower part is anchored to the top of the original column pier 3 using ground anchor bolts 17. The inner connecting steel plate 15 and the inner stiffening rib 16 are mechanically connected.

[0044] Preferably, the external steel support 9 is a replaceable component, and the cross-section can be angle steel, I-beam, rectangular tube and round tube, or buckling-resistance support component, which can play an energy dissipation and shock absorption role.

[0045] Furthermore, there are several upper connecting parts 10, which are prefabricated in the factory; these upper connecting parts 10 are distributed circumferentially along the expansion conversion tower 8 and welded to the reduced diameter position of the expansion conversion tower 8. Similarly, there are several lower connecting parts 11; these lower connecting parts 11 are distributed circumferentially along the upper surface of the newly poured reinforced concrete foundation 7 and pre-embedded within the newly poured reinforced concrete foundation 7. Correspondingly, there are several external steel supports 9; these external steel supports 9 are distributed circumferentially along the expansion conversion tower 8. The number of upper connecting parts 10, lower connecting parts 11, and external steel supports 9 are equal, and they are arranged in a one-to-one correspondence.

[0046] As a specific implementation method, a certain number of external steel supports 9 support the expansion conversion tower 8 along the circumference. The external steel supports 9 can play the role of energy dissipation and vibration reduction to enhance the wind and earthquake resistance of the structure. The upper and lower ends of the external steel supports 9 are connected to the upper connector 10 and the lower connector 11 by high-strength bolts or welding. Since the upper diameter of the expansion conversion tower 8 is larger than the original foundation ring 4, the external steel supports 9 are used to bear part of the upper load on the expansion conversion tower 8 along the circumference and transmit it to the newly poured reinforced concrete foundation 7 below through the lower connector 11.

[0047] The present invention also provides a method for local reinforcement of a wind turbine tower, the method being used to construct the aforementioned expansion and conversion device for the wind turbine tower, the method comprising:

[0048] 1. Based on the existing operating conditions of the wind turbine generator set, the design data of the original reinforced concrete foundation, and the required bearing capacity and operating conditions after the expansion, design the newly poured reinforced concrete foundation and the expansion conversion mechanism, determine the diameter and quantity of the reinforcement in the newly poured reinforced concrete foundation, the design diameter of the expansion conversion tower, the cross-sectional size of the external steel support, the dimensions of the upper and lower connectors, and the cross-sectional dimensions of the stiffening ribs of the outer cylinder wall, the internal connecting steel plates, and the internal stiffening ribs.

[0049] 2. Roughen the surface of the original reinforced concrete foundation, drill holes at the interface between the newly poured reinforced concrete foundation and the original reinforced concrete foundation, and insert connecting steel bars.

[0050] 3. Prefabricate the expansion conversion tower, external steel support, upper connector and lower connector in the factory, and weld stiffening ribs on the outer cylinder wall at the variable diameter inclined section of the expansion conversion tower, and transport it to the site.

[0051] 4. Pour the newly poured reinforced concrete foundation and pre-embed connectors along the circumferential direction on the surface of the newly poured reinforced concrete foundation.

[0052] 5. After the newly poured reinforced concrete foundation has been cured, the original tower will be replaced with an expansion and conversion tower. The expansion and conversion tower will be connected to the original foundation ring using the original upper flange connecting bolts. The external steel support will be connected to the upper and lower connecting parts using high-strength bolts or welding. The internal connecting steel plate will be mechanically connected to the internal stiffening ribs to form the expansion and conversion device of the wind turbine generator tower.

[0053] In summary, this invention addresses the problem that existing wind turbine generator sets urgently need capacity expansion while the underlying foundation requires correspondingly increased bearing capacity. It proposes a wind turbine generator tower expansion and conversion device and a local reinforcement method with a clear force transmission path, effectively solving the problems of incompatibility between the replacement tower and the underlying foundation, and insufficient bearing capacity of the underlying foundation due to increased tower expansion load. This invention can be widely promoted and applied in onshore wind power projects.

[0054] This invention increases the cross-sectional size of a wind turbine tower using a tower expansion and conversion device. This effectively solves the problem of inconsistency between the existing foundation ring and the upper tower diameter caused by the increased power generation of the wind turbine, which leads to a larger tower cross-sectional size. This avoids the massive engineering work required to demolish the original lower foundation. Furthermore, by installing diagonal supports at the junction of the original foundation ring and the upper expansion and conversion device, this invention transfers part of the load from the expanded wind turbine to the concrete foundation, meeting the original design requirements of the foundation ring. This achieves the goal of safe tower expansion and maximizing the benefits of the wind turbine. The diagonal supports also act as energy dissipation and vibration damping devices, enhancing the structure's wind and earthquake resistance.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

[0056] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A capacity expansion and conversion device for a wind turbine tower, characterized in that, The capacity expansion and conversion device includes: the original reinforced concrete foundation and the capacity expansion and conversion mechanism; The original reinforced concrete foundation includes: the original column pier, the original foundation ring, and the original upper flange connecting bolts; the original foundation ring is partially embedded in the original column pier. The expansion and conversion mechanism includes: a newly poured reinforced concrete foundation, an expansion and conversion tower, external steel supports, an upper connector, a lower connector, an upper connecting flange, and a lower connecting flange. The newly poured reinforced concrete foundation is located on the surface of the original reinforced concrete foundation, and the portion of the original foundation ring not embedded in the original column pier is embedded in the newly poured reinforced concrete foundation. The bottom of the expansion and conversion tower is connected to the top of the original foundation ring via the original upper flange connecting bolts. The external steel supports are connected to the expansion and conversion tower via the upper connector and to the newly poured reinforced concrete foundation via the lower connector, for fixing the newly poured reinforced concrete foundation and the expansion and conversion tower. The external steel supports are inclined support structures. The upper connecting flange is located at the top of the expansion and conversion tower for connecting the expanded wind turbine generator set. The lower connecting flange is located at the bottom of the expansion and conversion tower for connecting the original foundation ring. The bottom diameter of the expansion and conversion tower is the same as the top diameter of the original foundation ring, and the diameter of the expansion and conversion tower gradually increases along the height direction, remaining constant after reaching the design diameter. There are several upper connecting parts; the several upper connecting parts are distributed circumferentially along the expansion conversion tower and are welded to the reduced diameter position of the expansion conversion tower. There are several lower connectors; the several lower connectors are distributed circumferentially along the upper surface of the newly poured reinforced concrete foundation and are pre-embedded in the newly poured reinforced concrete foundation; There are several external steel supports; the several external steel supports are distributed circumferentially along the expansion conversion tower.

2. The capacity expansion and conversion device for wind turbine towers according to claim 1, characterized in that, The expansion and conversion mechanism further includes: an outer cylinder wall stiffening rib; the outer cylinder wall stiffening rib is located at the variable diameter inclined section of the expansion and conversion tower, and is used to construct a node reinforcement area at the variable diameter inclined section of the expansion and conversion tower.

3. The capacity expansion and conversion device for wind turbine towers according to claim 1, characterized in that, The expansion and conversion mechanism further includes: an inner connecting steel plate, inner stiffening ribs, and ground anchor bolts; the inner connecting steel plate is located in the portion of the original foundation ring not embedded in the original column pier; the inner connecting steel plate is composed of a ring top surface, a ring bottom surface, and a ring side surface connected at right angles, with the ring top surface connected to the top of the original foundation ring, the ring bottom surface connected to the top of the original column pier via the ground anchor bolts, and the ring side surface connected to the inner wall of the original foundation ring; the inner stiffening ribs are mechanically connected to the inner connecting steel plate; the newly poured reinforced concrete foundation, the inner connecting steel plate, and the inner stiffening ribs are used to strengthen the rigidity of the portion of the original foundation ring not embedded in the original column pier.

4. The capacity expansion and conversion device for wind turbine towers according to claim 1, characterized in that, The original reinforced concrete foundation also includes: the original foundation base slab; the original foundation base slab is located at the bottom of the original column pier.

5. The capacity expansion and conversion device for wind turbine towers according to claim 1, characterized in that, The newly poured reinforced concrete foundation is obtained by roughening the surface of the original reinforced concrete foundation, inserting a set number of connecting steel bars according to the structural design, and then pouring the concrete.

6. The capacity expansion and conversion device for wind turbine towers according to claim 1, characterized in that, The external steel support is a replaceable component or a buckling-resistance support component, and the cross-section used is angle steel, I-beam, rectangular tube or round tube.

7. A method for local reinforcement of a wind turbine generator tower, characterized in that, The local reinforcement method is used to construct the expansion and conversion device for the wind turbine tower as described in any one of claims 1-6, and the local reinforcement method includes: Based on the existing operating conditions of the wind turbine generator set, the design data of the original reinforced concrete foundation, and the required bearing capacity and operating conditions after the expansion, the design of the newly poured reinforced concrete foundation and the expansion conversion mechanism is carried out. The diameter and quantity of the reinforcement in the newly poured reinforced concrete foundation, the design diameter of the expansion conversion tower, the cross-sectional size of the external steel support, the dimensions of the upper and lower connectors, and the cross-sectional dimensions of the stiffening ribs of the outer cylinder wall, the internal connecting steel plate, and the internal stiffening ribs are determined. Roughen the surface of the original reinforced concrete foundation, drill holes at the interface between the newly poured reinforced concrete foundation and the original reinforced concrete foundation, and insert connecting steel bars. Prefabricate the expansion conversion tower, external steel support, upper connector and lower connector, and weld stiffening ribs on the outer wall at the variable diameter inclined section of the expansion conversion tower; Pour a new reinforced concrete foundation and pre-embed connectors along the circumferential direction on the surface of the new reinforced concrete foundation; After the newly poured reinforced concrete foundation has been cured, the original tower will be replaced with an expansion and conversion tower. The expansion and conversion tower will be connected to the original foundation ring using the original upper flange connecting bolts. The external steel support will be connected to the upper and lower connecting parts using high-strength bolts or welding. The internal connecting steel plate will be mechanically connected to the internal stiffening ribs to form the expansion and conversion device of the wind turbine generator tower.

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