Device and method for reinforcing fan foundation through electric heating prestress ring

Abstract

The invention provides a device and method for reinforcing a fan foundation through electric heating prestress rings, the device comprises a newly-added reinforced concrete body and a plurality of electric heating prestress rings, and the newly-added reinforced concrete body is arranged on an original wind power concrete foundation and arranged on the periphery of an original foundation ring structure; the multiple electric heating prestress rings are annularly arranged on the periphery of the original foundation ring structure and embedded in the newly-added reinforced concrete body. According to the method, the bond stress between the newly-poured concrete body and the original concrete foundation can be effectively guaranteed, and the reinforcing effect of the newly-poured concrete body is guaranteed; meanwhile, the bond stress between an original concrete foundation and an original foundation ring structure can be improved, and the reinforcing effect is improved; and concrete only needs to be poured once, so that the construction efficiency is high.

Description

Technical Field

[0001] The invention belongs to the field of fan foundations, and in particular relates to a device and a method for reinforcing a fan foundation with an electric heating prestressed ring. Background Art

[0002] With the introduction of the national clean energy policy, wind power has achieved rapid development. As an important part of wind power generation, wind power infrastructure is related to the safety and stability of wind turbines.

[0003] In recent years, as wind turbine foundations have been in use for a long time, a large number of concrete wind turbine foundations have become loose, and other problems have occurred. Therefore, it is necessary to reinforce the wind turbine foundations that have become loose or have problems.

[0004] like Figure 1 As shown, the traditional reinforcement method 1 is usually to add a certain amount of concrete around the wind turbine foundation ring and on the top of the original foundation of the wind turbine. The concrete is connected to the wind turbine tower or foundation ring only through the bonding force of the concrete or rivets. This connection is weak and cannot ensure that the newly added concrete has a stable connection with the wind turbine tower or foundation ring.

[0005] Traditional reinforcement method 2 (CN201520575870.1) is to surround the new concrete with steel strands and apply preload. This reinforcement method requires that a new circle of concrete be poured on the outside of the steel strands after the preload is applied. The concrete needs to be poured in two times, which leads to low efficiency of foundation reinforcement construction.

[0006] Traditional reinforcement method 3 (CN2019216047133) is to place a high-pressure grouting ring inside the newly poured concrete to improve the bond strength between the newly poured concrete and the steel structure tower. However, this method has a disadvantage, that is, when the slurry pressure in the high-pressure grouting ring is too high, it will crack the top of the newly poured concrete, so the grouting pressure cannot be increased greatly. Summary of the invention

[0007] The purpose of the present invention is to provide a device and method for reinforcing a wind turbine foundation with an electrothermal prestressed ring, which solves the defects of low work efficiency and poor effect in the existing reinforcement of wind power foundations.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a device for reinforcing a wind turbine foundation with an electrothermal prestressed ring, comprising a newly added reinforced concrete body and a plurality of electrothermal prestressed rings, wherein the newly added reinforced concrete body is arranged on the original concrete foundation of the wind turbine and is placed on the periphery of the original foundation ring structure; A plurality of electric heating prestressed rings are arranged in a circular shape on the periphery of the original foundation ring structure and are embedded in the newly added reinforced concrete body.

[0009] Preferably, the electrothermal prestressed ring comprises a plurality of sub-electrothermal prestressed rings, and the plurality of sub-electrothermal prestressed rings are sequentially spliced ​​to form an annular structure.

[0010] Preferably, a plurality of sub-electrothermal prestressed rings are sequentially spliced ​​via flanges to form an annular structure.

[0011] Preferably, the electrothermal prestressed ring comprises an inner shell of an annular structure and an outer shell of an annular structure, wherein the inner shell is placed in the inner cavity of the outer shell, and a heat insulating material is filled between the two; A resistance wire is arranged in the inner shell, and the resistance wire is connected to an external power source.

[0012] Preferably, a temperature sensor is provided on the inner wall of the inner shell.

[0013] Preferably, a ventilation pipe is also provided on the outer wall of the outer shell.

[0014] Preferably, a valve is provided on the ventilation pipe.

[0015] A method for reinforcing a fan foundation with an electrothermal prestressed ring, based on the device, comprises the following steps: Step 1: Tie steel bars around the original concrete foundation of the wind power plant to form a steel mesh; Step 2, placing an electric heating prestressing ring in the steel mesh; Step 3, turning on the electric heating prestressing ring to heat to a set temperature, and then pouring concrete to form a newly added reinforced concrete body; Step 4: After the newly reinforced concrete body is cured to the set strength, the electric heating prestressing ring is turned off to stop heating and complete the prestressing.

[0016] Preferably, when the electric heating prestressing ring is turned on for heating, the ventilation pipe is closed.

[0017] Preferably, when the electric heating prestressing ring is turned off to stop heating, the vent pipe is opened.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a device for reinforcing a fan foundation with an electric heating prestressed ring. The electric heating prestressed ring is first heated. The prestressed ring has a certain expansion pre-tightening force. Then new concrete is poured to form a newly added concrete body. After the strength of the newly added concrete body reaches a set value, the heating of the electric heating prestressed ring is stopped, and the application of prestress is completed. The bonding force between the newly poured concrete body and the original concrete foundation can be effectively guaranteed, and the reinforcement effect of the newly poured concrete body can be guaranteed. Moreover, concrete only needs to be poured once, and the construction efficiency is high.

[0019] Furthermore, the electrothermal prestressed ring is arranged into a plurality of sub-electrothermal prestressed rings for easy transportation.

[0020] Furthermore, the space between the inner shell and the outer shell is filled with heat insulating material, which effectively slows down the speed of heat conduction from the inner shell to the outer shell. Due to its good flexibility, it can absorb and disperse the deformation stress caused by temperature difference during the heating and cooling process, thereby ensuring that when the inner shell shrinks after the heating is stopped, it will not excessively pull the outer shell and cause unnecessary deformation. After the heating is stopped, the contraction of the inner shell will not cause the outer shell to shrink too much, thereby preventing cracks between the outer shell and the surrounding concrete foundation due to stress concentration, ensuring the integrity and stability of the overall structure, and avoiding cracks between the outer ring and the concrete.

[0021] Furthermore, the space between the inner and outer shells is connected to the outside air through a ventilation pipe. After the heating is stopped, the ventilation pipe is opened to introduce external cold air or use the principle of natural convection to accelerate the heat loss inside the electrothermal prestressed ring, achieve rapid cooling, accelerate the cooling of the electrothermal prestressed ring, and then complete the prestressing. This process not only shortens the time for the prestressed ring to reach the target temperature, but also improves the efficiency and accuracy of the prestressing, which helps to more accurately control the prestressed state of the structure and optimize its mechanical properties and service life.

[0022] The present invention provides a method for reinforcing a fan foundation with an electric heating prestressed ring. The electric heating prestressed ring is first heated. The prestressed ring has a certain expansion pretightening force. Then new concrete is poured to form a newly added concrete body. After the strength of the newly added concrete body reaches a set value, the heating of the electric heating prestressed ring is stopped, and the electric heating prestressed ring shrinks to complete the application of prestress to the newly added concrete body, thereby ensuring the bond strength between the newly poured concrete body and the original concrete foundation, and ensuring the reinforcement effect of the newly poured concrete body. At the same time, the bond strength between the original concrete foundation and the original foundation ring structure can be improved, thereby improving the reinforcement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the traditional reinforcement method1; Figure 2 It is a three-dimensional schematic diagram of a device for strengthening the foundation; Figure 3 It is a plan view of a device for strengthening the foundation; Figure 4 It is another plan view of the device for strengthening the foundation; Figure 5 It is a schematic diagram of the structure of a horizontally opened electrothermal prestressed ring; Figure 6 It is a schematic diagram of the structure of a vertically open electrothermal prestressed ring; Among them, 1. New reinforced concrete body; 2. Electric heating prestressed ring; 3. Original concrete foundation of wind power; 4. Original foundation ring structure; 21. Inner shell; 22. Outer shell; 23. Insulation material; 24. Resistance wire; 25. Cable; 26. Ventilation pipe. DETAILED DESCRIPTION

[0024] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0025] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0026] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0028] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0029] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0030] Example 1 This embodiment provides a device for reinforcing a wind turbine foundation with an electric heating prestressed ring, which includes adding reinforced concrete to the periphery of the original concrete foundation, and arranging an electric heating prestressed ring in the newly added reinforced concrete. The newly added concrete can increase the strength and rigidity of the original concrete structure, reduce the stress on the original concrete structure, and play a role in reinforcing the original concrete structure. The electric heating prestressed ring can play a role in ensuring that the newly poured concrete is firmly connected to the original concrete structure.

[0031] Specifically, it includes a newly added reinforced concrete body 1 and a plurality of electric heating prestressed rings 2 , wherein the newly added reinforced concrete body 1 is arranged on the original concrete foundation 3 of the wind power plant and is placed on the periphery of the original foundation ring structure 4 .

[0032] A plurality of electric heating prestressed rings 2 are all sleeved on the original basic ring structure 4 and embedded in the newly added reinforced concrete body 1 .

[0033] Example 2 This embodiment provides a device for reinforcing a wind power foundation with an electrothermal prestressed ring, comprising a newly added reinforced concrete body 1 and a plurality of electrothermal prestressed rings 2, wherein the newly added reinforced concrete body 1 is arranged on the original concrete foundation 3 of the wind power and is placed on the periphery of the original foundation ring structure 4.

[0034] A plurality of electric heating prestressed rings 2 are evenly distributed on the original concrete foundation 3 , are sleeved on the periphery of the original foundation ring structure 4 , and are pre-buried in the newly added reinforced concrete body 1 .

[0035] The electrothermal prestressed ring 2 comprises an inner shell 21 of an annular structure and an outer shell 22 of an annular structure, wherein the inner shell 21 is placed in the inner cavity of the outer shell 22, and a heat insulating material 23 is filled between the inner shell 21 and the outer shell 22.

[0036] A resistance wire 24 is arranged in the inner housing 21 , and the resistance wire 24 is connected to an external power source via a cable 25 .

[0037] A vent pipe 26 is also provided on the outer wall of the outer shell 22 , and a valve is provided on the vent pipe 26 .

[0038] A temperature sensor is disposed on the inner wall of the inner housing 21 .

[0039] In this embodiment, when the power supply is turned on, the resistance wire 24 causes the electrothermal prestressed ring 2 to heat up, thereby driving the inner shell 21 to expand. Since the inner shell 21 and the outer shell 22 are filled with a heat-insulating material 23, the heat conduction speed from the inner shell 21 to the outer shell 22 is effectively slowed down. Due to its good flexibility, it can absorb and disperse the deformation stress caused by the temperature difference during the heating and cooling process, thereby ensuring that when the inner shell shrinks after the heating is stopped, it will not excessively pull the outer shell and cause unnecessary deformation. After the heating is stopped, the contraction of the inner shell will not cause the outer shell to shrink too much, thereby preventing the crack problem caused by stress concentration between the outer shell and the surrounding concrete foundation, ensuring the integrity and stability of the overall structure, and avoiding cracks between the outer ring and the concrete.

[0040] Example 3 This embodiment provides a device for reinforcing a wind power foundation with an electrothermal prestressed ring, comprising a newly added reinforced concrete body 1 and a plurality of electrothermal prestressed rings 2, wherein the newly added reinforced concrete body 1 is arranged on the original concrete foundation 3 of the wind power and is placed on the periphery of the original foundation ring structure 4.

[0041] A plurality of electric heating prestressed rings 2 are all sleeved on the original basic ring structure 4 and embedded in the newly added reinforced concrete body 1 .

[0042] Each of the electrothermal prestressed rings 2 includes a plurality of sub-electrothermal prestressed rings, and the plurality of sub-electrothermal prestressed rings are sequentially spliced ​​through flanges to form an annular structure.

[0043] In this embodiment, the electrothermal prestressed ring is arranged into a plurality of sub-electrothermal prestressed rings, which is convenient for transportation and installation.

[0044] Example 4 This embodiment provides a device for reinforcing a wind power foundation with an electrothermal prestressed ring, comprising a newly added reinforced concrete body 1 and a plurality of electrothermal prestressed rings 2, wherein the newly added reinforced concrete body 1 is arranged on the original concrete foundation 3 of the wind power and is placed on the periphery of the original foundation ring structure 4.

[0045] A plurality of electric heating prestressed rings 2 are all sleeved on the original basic ring structure 4 and embedded in the newly added reinforced concrete body 1 .

[0046] Each of the electrothermal prestressed rings 2 includes a plurality of sub-electrothermal prestressed rings, and the plurality of sub-electrothermal prestressed rings are sequentially spliced ​​through flanges to form an annular structure.

[0047] Each of the electrothermal prestressed rings 2 comprises an inner shell 21 of an annular structure and an outer shell 22 of an annular structure, wherein the inner shell 21 is placed in the inner cavity of the outer shell 22, and a heat insulating material 23 is filled between the two.

[0048] A resistance wire 24 is arranged in the inner housing 21 , and the resistance wire 24 is connected to an external power source via a cable 25 .

[0049] A vent pipe 26 is also provided on the outer wall of the outer shell 22 , and a valve is provided on the vent pipe 26 .

[0050] A temperature sensor is disposed on the inner wall of the inner housing 21 .

[0051] Example 5 This embodiment provides a device for reinforcing a wind power foundation with an electrothermal prestressed ring, comprising a newly added reinforced concrete body 1 and a plurality of electrothermal prestressed rings 2, wherein the newly added reinforced concrete body 1 is arranged on the original concrete foundation 3 of the wind power and is placed on the periphery of the original foundation ring structure 4.

[0052] A plurality of electric heating prestressed rings 2 are all sleeved on the original basic ring structure 4 and embedded in the newly added reinforced concrete body 1 .

[0053] The diameters of the multiple electrothermal prestressed rings 2 are gradually changed, i.e., they increase successively; The diameters of the multiple electrothermal prestressing rings 2 are all equal, or: Among the plurality of electrothermal prestressed rings 2 , diameters of some of the electrothermal prestressed rings 2 are equal, and diameters of the remaining portion of the electrothermal prestressed rings 2 are gradually changed.

[0054] In this embodiment, in order to enhance the overall prestressing effect of the structure or to meet the reinforcement needs of a larger scale, electric heating prestressing rings can be set at multiple levels or regions of the same foundation or structure. The setting of multiple electric heating prestressing rings needs to consider the interaction between them, the uniformity of prestressing transmission, and the stability of the overall structure. At the same time, it is also necessary to reasonably plan the layout of the power supply and temperature monitoring system, such as: When the diameters of the multiple electrothermal prestressed rings 2 are equal, the installation method of the electrothermal prestressed rings is: the multiple electrothermal prestressed rings 2 are evenly distributed along the axial direction of the original basic ring structure 4. At this time, Figure 5 As shown, the ventilation pipe 26 provided on each electrothermal prestressing ring 2 is arranged on the side wall of the outer shell 22 .

[0055] When the diameters of the multiple electrothermal prestressed rings 2 are gradually changed, the installation method of the electrothermal prestressed rings is: Multiple electrothermal prestressed rings 2 are evenly distributed along the axial direction of the original basic ring structure 4. At this time, Figure 5As shown, the vent pipe 26 provided on each electrothermal prestressed ring 2 is arranged on the side wall of the outer shell 22, or the vent pipe 26 provided on each electrothermal prestressed ring 2 is arranged on the top of the outer shell 22. Preferably, the vent pipe 26 provided on each electrothermal prestressed ring 2 is arranged on the top of the outer shell 22. Placing the vent pipe on the top can more effectively utilize natural convection or forced ventilation system, accelerate the cooling process of the prestressed ring, and improve the efficiency of prestressing. Providing the vent pipe on the top can avoid interference with other structures or equipment and keep the appearance of the structure neat. When the vent pipe needs to be inspected or maintained, the top position is easier to approach and operate.

[0056] Multiple electrothermal prestressed rings 2 are arranged along the radial direction of the original basic ring structure 4. Figure 6 As shown, the ventilation pipe 26 provided on each electrothermal prestressing ring 2 is arranged on the top of the outer shell 22 .

[0057] When the diameters of some of the multiple electrothermal prestressed rings 2 are equal and the diameters of the remaining electrothermal prestressed rings 2 are gradually changed, the installation method of the electrothermal prestressed rings is: A portion of the multiple electrothermal prestressed rings 2 are arranged along the radial direction of the original basic ring structure 4 , and the remaining electrothermal prestressed rings 2 are evenly distributed along the axial direction of the original basic ring structure 4 .

[0058] Example 5 This embodiment provides a method for reinforcing a wind turbine foundation with an electric heating prestressed ring, comprising the following steps: Step 1: Tie steel bars around the original concrete foundation of the wind power plant to form a steel mesh; Step 2, placing an electric heating prestressing ring in the steel mesh; Step 3, turning on the electric heating prestressing ring to heat to a set temperature, and then pouring concrete to form a newly added reinforced concrete body; Step 4: After the newly reinforced concrete body is cured to the set strength, the electric heating prestressing ring is turned off to stop heating and complete the prestressing.

[0059] Add reinforced concrete to the periphery of the original concrete foundation, and arrange electric heating prestressed rings in the newly added reinforced concrete. The newly added concrete can increase the strength and rigidity of the original concrete structure, reduce the stress on the original concrete structure, and play a role in reinforcing the original concrete structure. The electric heating prestressed ring can ensure that the newly poured concrete is firmly connected to the original concrete structure.

[0060] Example 6 This embodiment provides a method for reinforcing a wind power foundation using an electrothermal prestressed ring, comprising the following steps: Step 1: on the original concrete foundation 3 of the wind power plant, steel bars are tied around the periphery of the original foundation ring structure 4 to form a steel mesh; Step 2, placing the electric heating prestressed ring 2 in the steel mesh, the installation position, installation height, and installation quantity of the electric heating prestressed ring 2 can be determined by calculation and analysis, such as: When the diameters of the multiple electrothermal prestressed rings 2 are equal, the installation method of the electrothermal prestressed rings is: the multiple electrothermal prestressed rings 2 are evenly distributed along the axial direction of the original basic ring structure 4. At this time, Figure 5 As shown, the ventilation pipe 26 provided on each electrothermal prestressing ring 2 is arranged on the side wall of the outer shell 22 .

[0061] When the diameters of the multiple electrothermal prestressed rings 2 are gradually changed, the installation method of the electrothermal prestressed rings is: Multiple electrothermal prestressed rings 2 are evenly distributed along the axial direction of the original basic ring structure 4. At this time, Figure 5 As shown, the vent pipe 26 provided on each electrothermal prestressed ring 2 is arranged on the side wall of the outer shell 22, or the vent pipe 26 provided on each electrothermal prestressed ring 2 is arranged on the top of the outer shell 22. Preferably, the vent pipe 26 provided on each electrothermal prestressed ring 2 is arranged on the top of the outer shell 22. Placing the vent pipe on the top can more effectively utilize natural convection or forced ventilation system, accelerate the cooling process of the prestressed ring, and improve the efficiency of prestressing. Providing the vent pipe on the top can avoid interference with other structures or equipment and keep the appearance of the structure neat. When the vent pipe needs to be inspected or maintained, the top position is easier to approach and operate.

[0062] Multiple electrothermal prestressed rings 2 are arranged along the radial direction of the original basic ring structure 4. Figure 6 As shown, the ventilation pipe 26 provided on each electrothermal prestressing ring 2 is arranged on the top of the outer shell 22 .

[0063] When the diameters of some of the multiple electrothermal prestressed rings 2 are equal and the diameters of the remaining electrothermal prestressed rings 2 are gradually changed, the installation method of the electrothermal prestressed rings is: A portion of the multiple electrothermal prestressed rings 2 are arranged along the radial direction of the original basic ring structure 4 , and the remaining electrothermal prestressed rings 2 are evenly distributed along the axial direction of the original basic ring structure 4 .

[0064] Step 3, after the electric heating prestressed ring 2 is installed in place, the ventilation pipe 26 is closed, and the electric heating prestressed ring is connected to the external power supply through the cable 25, and the resistance wire 24 is heated. At this time, the electric heating prestressed ring 2 expands in the annular direction as a whole. By monitoring the temperature of the electric heating prestressed ring 2, the preload force of the electric heating prestressed ring 2 can be controlled. This is because the electric heating prestressed ring is a device that uses the principle of generating heat by passing electric current through resistance to apply prestress or adjust the temperature of the structure. In this process, current is the key factor in generating heat, and the accumulation of heat directly affects the temperature of the prestressed ring. When current passes through the resistance material of the electric heating prestressed ring, according to Joule's law (Q = I 2 R ),in Q is the heat generated, I is the current, R is the resistor, t It is time, and it can be seen that the square of the current is proportional to the heat generated. Therefore, by adjusting the size of the current, the heat generated by the electrothermal prestressing ring per unit time can be accurately controlled, and then the change of its temperature can be controlled.

[0065] Step 4, maintaining the electric heating prestressed ring 2 under a specific prestressed value (temperature value), carrying out concrete pouring work, after the concrete pouring is completed, a newly added reinforced concrete body 1 is formed; at this time, a part of the cable is still exposed outside the reinforced concrete body 1, and the state of being connected to the external power supply is maintained to maintain the temperature value of the electric heating prestressed ring 2. One end of the vent pipe 26 and the valve are both exposed outside the reinforced concrete body 1.

[0066] When the reinforced concrete body 1 is cured to a certain strength, turn off the external power supply and open the valve; then, the temperature of the electric heating prestressed ring 2 will slowly drop, and the body of the electric heating prestressed ring 2 will gradually lock. Since there is a heat-insulating material between the inner shell and the outer shell, the contraction of the inner shell after stopping heating will not cause the outer shell to shrink too much, thereby avoiding cracks between the outer shell and the reinforced concrete body 1; the electric heating prestressed ring 2 will give the reinforced concrete body 1 a certain pre-tightening force to ensure that the reinforced concrete body 1 is firmly connected to the original concrete foundation 3 of the wind power plant, thereby completing the application of prestress.

[0067] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A device for reinforcing a fan foundation with an electric heating prestressed ring, characterized in that: It comprises a newly added reinforced concrete body (1) and a plurality of electric heating prestressed rings (2), wherein the newly added reinforced concrete body (1) is arranged on an original concrete foundation (3) of a wind power plant and is placed outside an original foundation ring structure (4); A plurality of electric heating prestressed rings (2) are arranged in a ring direction on the periphery of the original foundation ring structure (4), and are pre-buried in the newly added reinforced concrete body (1).

2. The device for reinforcing the foundation of a fan with an electric heating prestressed ring according to claim 1 is characterized in that: The electrothermal prestressed ring (2) comprises a plurality of sub-electrothermal prestressed rings, and the plurality of sub-electrothermal prestressed rings are sequentially spliced ​​to form a ring structure.

3. The device for reinforcing the foundation of a fan with an electric heating prestressed ring according to claim 2 is characterized in that: A plurality of sub-electrothermal prestressed rings are sequentially spliced ​​through flanges to form a ring structure.

4. A device for reinforcing a wind turbine foundation using an electric heating prestressed ring according to any one of claims 1 to 3, characterized in that: The electrothermal prestressed ring (2) comprises an inner shell (21) of an annular structure and an outer shell (22) of an annular structure, wherein the inner shell (21) is placed in the inner cavity of the outer shell (22), and a heat insulating material (23) is filled between the inner shell (21) and the outer shell (22). A resistance wire (24) is arranged in the inner housing (21), and the resistance wire (24) is connected to an external power source.

5. The device for reinforcing the foundation of a wind turbine with an electric heating prestressed ring according to claim 4, characterized in that: A temperature sensor is provided on the inner wall of the inner shell (21).

6. The device for reinforcing the foundation of a wind turbine with an electric heating prestressed ring according to claim 4, characterized in that: A ventilation pipe (26) is also provided on the outer wall of the outer shell (22).

7. The device for reinforcing the foundation of a wind turbine with an electric heating prestressed ring according to claim 6, characterized in that: The ventilation pipe (26) is provided with a valve.

8. A method for reinforcing a fan foundation with an electric heating prestressed ring, characterized in that: The device according to any one of claims 1 to 7 comprises the following steps: Step 1: Tie steel bars around the original concrete foundation of the wind power plant to form a steel mesh; Step 2, placing an electric heating prestressing ring in the steel mesh; Step 3, turning on the electric heating prestressing ring to heat to a set temperature, and then pouring concrete to form a newly added reinforced concrete body; Step 4: After the newly reinforced concrete body is cured to the set strength, the electric heating prestressing ring is turned off to stop heating and complete the prestressing.

9. The method for reinforcing a wind turbine foundation with an electric heating prestressed ring according to claim 1, characterized in that: When the electric heating prestressing ring is turned on for heating, the ventilation pipe is closed.

10. The method for reinforcing a wind turbine foundation with an electric heating prestressed ring according to claim 1, characterized in that: When the electric heating prestressing ring is turned off to stop heating, open the vent pipe.

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