A fan foundation reinforcement device acting on the original foundation concrete of the fan

Abstract

The present invention discloses a wind turbine foundation reinforcement device that acts on the original foundation concrete of a wind turbine, and belongs to the technical field of wind turbine foundation reinforcement devices. It is arranged above the original concrete foundation, including a newly added concrete foundation arranged above the original foundation concrete, a tapered hole is opened in the middle of the newly added concrete foundation, the tapered hole surrounds the wind turbine tower, and the newly added concrete foundation is provided with a number of mounting brackets evenly distributed around the circumference of the tower, one end of the mounting bracket is connected to the newly added concrete foundation, and the other end of the mounting bracket is located above the tapered hole, and is provided with a threaded rod threadedly connected thereto, a mounting cylinder is provided on the outer side of the end of the threaded rod, one end of the mounting cylinder is fixed to the surface of the mounting cylinder, and a prestressed spring is provided inside the mounting cylinder. This technical solution is used to fill the gap between the concrete and the tower, delay the generation and expansion rate of the gap, and improve the service life of the wind turbine foundation.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind turbine foundation reinforcement devices, and in particular relates to a wind turbine foundation reinforcement device acting on the original foundation concrete of the wind turbine. Background Art

[0002] Wind power is a new type of clean, efficient and renewable green energy. Using wind power to generate electricity can not only reduce the consumption of mineral resources, but also greatly reduce the pollution to the environment. Its unique advantages of zero emissions, low cost and renewable nature will undoubtedly make it one of the main ways of energy supply in the future.

[0003] Currently, the foundation ring type, the most common type of foundation for wind turbines installed in my country, is the foundation ring type, which also presents the most problems. Unlike other high-rise buildings, the foundations of large wind turbines are subject to more complex loads. Their foundations have the special characteristics of bearing repeated loads in 360-degree directions and large eccentric forces, thus placing high demands on the stability of the foundation. In recent years, this special characteristic has resulted in many existing wind turbine units with conservative or unsafe foundation designs, and wind turbines using foundation rings have frequently experienced defects in their foundations. Combined with the operating characteristics of the wind turbine, it can be seen that the foundation ring and the concrete foundation are the concentrated locations of stress loads, and the load level is higher in the main direction of the wind turbine, thus having a greater impact on the firmness of the foundation structure. At the same time, the wind load acts repeatedly during the operation of the wind turbine, so the wind load wear effect on the contact area between the tower or foundation ring and the concrete is more serious. After wear, a gap will appear between the two, and the gap will gradually expand from top to bottom. The continuous expansion of the gap will cause the deflection and shaking distance of the tower to increase, which will accelerate the wear of the concrete. In the long run, this will cause the connection strength between the tower and the foundation to become lower and lower, and even the foundation will collapse and be damaged. Therefore, reinforcement of the defects of the wind turbine foundation is imperative. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a wind turbine foundation reinforcement device that acts on the original foundation concrete of the wind turbine, so as to fill the gap between the concrete and the tower, delay the generation and expansion rate of the gap, and improve the service life of the wind turbine foundation.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a wind turbine foundation reinforcement device that acts on the original foundation concrete of the wind turbine. The device is arranged above the original concrete foundation and includes a newly added concrete foundation arranged above the original concrete foundation. A tapered hole is opened in the middle of the newly added concrete foundation. The tapered hole surrounds the wind turbine tower. The newly added concrete foundation is provided with a plurality of mounting brackets evenly distributed around the circumference of the tower. One end of the mounting bracket is connected to the newly added concrete foundation. The other end of the mounting bracket is located above the tapered hole and is provided with a threaded rod threadedly connected thereto. A mounting cylinder is provided on the outer side of the end of the threaded rod. One end of the cam is fixed to the surface of the mounting bracket, and a prestressed spring is provided inside the mounting cylinder, one end of the prestressed spring is fixedly connected to the end of the screw, and the other end of the prestressed spring is provided with a push rod, one end of the push rod is fixed to the other end of the spring, and the other end of the push rod extends out of the mounting cylinder and is slidably connected to the mounting cylinder, and a matching conical extrusion component is provided in the conical hole, and the middle part of the conical extrusion component is slidably sleeved on the tower, and one end of the conical extrusion component is located in the conical hole, and the other end of the conical extrusion component is in close contact with an end of the push rod located on the outside of the mounting cylinder.

[0007] Furthermore, a conical sealing component is provided in the conical hole, the middle part of the conical sealing component is slidably sleeved on the tower, and the conical sealing component is located below the conical extrusion component. The conical sealing component and the conical extrusion component are provided with a clamping spring, and the two ends of the clamping spring are fixedly connected to the two respectively.

[0008] Furthermore, the conical extrusion component and the conical sealing component are both hollow, and a number of annular through holes are provided on both ends of the two components. The through hole on one end of the conical sealing component points to the connection part between the original foundation concrete and the tower, and the through hole on the other end of the conical sealing component is provided with a flexible grouting pipe. One end of the flexible grouting pipe is fixedly connected to the through hole of the conical sealing component, and the other end of the flexible grouting pipe passes through the through hole of the conical extrusion component and extends to the outside of the conical extrusion component.

[0009] Furthermore, a steel plate covering the surface of the newly added concrete is provided on the outside, and one end of the mounting bracket is fixed to the steel plate.

[0010] Furthermore, the tapered hole includes an upper cylindrical hole and a lower tapered hole, the tapered extrusion component is arranged in the upper cylindrical hole, and the tapered sealing component is arranged in the lower tapered hole.

[0011] Furthermore, the tapered extrusion component is composed of a plurality of independent arc-shaped extrusion components.

[0012] Furthermore, the newly added concrete foundation includes vertical structural steel bars, oblique tensile steel bars, skirt plates, newly added concrete, stirrups, longitudinal steel mesh, transverse steel mesh, horizontal annular frame bars and horizontal thick steel bars, and the original concrete foundation includes the contact frustum portion, original foundation concrete, tower tube and foundation ring;

[0013] A longitudinal steel mesh is set up around the outside of the original foundation concrete, and the longitudinal steel mesh is welded to the steel bars in the foundation truncated cone; a transverse steel mesh is set up on the top of the original foundation concrete, and the longitudinal steel mesh and the transverse steel mesh are welded, and the transverse steel mesh is welded to the steel bars in the original foundation concrete;

[0014] The transverse steel mesh is provided with oblique tensile steel bars pointing obliquely downward, and a skirt plate is welded on the foundation ring within the range of the transverse steel mesh. One end of the oblique tensile steel bar is welded to the skirt plate, and the other end points obliquely downward to the longitudinal steel mesh; multiple layers of horizontal coarse steel bars are provided on the inner side of the foundation ring, wherein one end of the horizontal coarse steel bars is bent and welded to the foundation ring; vertical structural steel bars are provided in the longitudinal steel mesh, and the other end of the oblique tensile steel bar is welded to the top of the vertical structural steel bar; stirrups are welded at the connection between the vertical structural steel bars and the oblique tensile steel bars; the tower is provided on the top of the foundation, and new concrete is poured on the longitudinal steel mesh, transverse steel mesh, vertical structural steel bars, stirrups and oblique tensile steel bars.

[0015] Furthermore, a foundation lower flange is provided at the lower end of the foundation ring, a foundation upper flange is provided on the side wall of the foundation ring above the transverse steel mesh, and a plurality of oblique tensile steel bars are welded on the skirt plate of the foundation ring; the number of the vertical structural steel bars is consistent with the number of the oblique tensile steel bars.

[0016] Furthermore, the newly added concrete surrounds the side wall of the foundation ring, with the lower end located on the original foundation concrete slope and extending a certain distance in the radial direction.

[0017] Furthermore, four horizontal annular frame bars are provided in the newly added concrete, and stirrups are provided at the connection points between the vertical structural steel bars and the oblique tensile steel bars, and the three are connected in pairs by welding.

[0018] The beneficial effects of the present invention are:

[0019] (1) The present invention provides a solution for reinforcing the foundation of a wind turbine generator set, which can be used to solve the reinforcement problems of existing wind turbine generator sets such as loose flange foundations, cracks in foundation concrete, and foundation construction quality problems;

[0020] (2) The present invention increases the burial depth of the foundation ring by arranging oblique tensile steel bars at the upper end of the foundation ring. The increase in burial depth significantly reduces the maximum principal compressive stress of the concrete. It also strengthens the connection between the foundation ring and the foundation concrete, expands the compression surface and the length of the force arm of the concrete under the action of lateral bending moment and horizontal force, reduces horizontal stress, and increases the foundation's load-bearing cross-sectional area through the newly added radial concrete, thereby strengthening the lateral constraint of the foundation on the wind turbine foundation ring. After reinforcement, the bearing capacity of the wind turbine foundation is significantly improved.

[0021] (3) The newly added concrete reduces the total overhang length of the original foundation base, reduces the angle between the plumb line at the edge of the column and the line connecting the edge of the base, and increases the safety factor. From the perspective of the base force of the rigid expanded foundation, the bending tensile stress and shear stress that can be sustained are both increased;

[0022] (4) The setting of components such as conical extrusion parts and prestressed springs, under the action of prestress, will cause the conical extrusion parts to move downward to fill the gap between the tower and the concrete, thereby reducing the vibration amplitude of the tower when it is loaded, and thus reducing the rate of gap generation; at the same time, after the upper gap is filled, the gap is difficult to develop downward, and the gap generation site is controlled in the upper concrete, thereby avoiding damage to the original concrete foundation and improving the firmness of the wind turbine foundation;

[0023] (5) The setting of flexible grouting pipes and conical sealing components enables workers to grout and repair the tiny gap between the original concrete foundation and the tower through the grouting pipe, further improving the firmness of the foundation.

[0024] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0026] Figure 1 A schematic diagram of the reinforcement device of the present invention acting on newly added concrete;

[0027] Figure 2 A schematic cross-sectional view of the reinforcement device of the present invention acting on newly added concrete;

[0028] Figure 3 A schematic cross-sectional view of the reinforcement device of the present invention acting on newly added concrete in another direction;

[0029] Figure 4 is a three-dimensional schematic diagram of the reinforcement device of the present invention;

[0030] Figure 5 Based Figure 2 A partial enlarged schematic diagram of point A in the middle;

[0031] Figure 6 for Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0032] Figure 7 for Figure 4 A partial enlarged schematic diagram of point C in the middle;

[0033] Figure 8 This is a schematic diagram of the steel plate covering the newly added concrete;

[0034] Figure 9 This is a schematic diagram for setting up a new concrete foundation;

[0035] Figure 10 This is a simplified diagram of the reinforcement arrangement for the newly added concrete foundation;

[0036] Figure 11 for Figure 10 Schematic diagram of the AA section view;

[0037] Figure 12 for Figure 9 A partial enlarged schematic diagram of point B in the middle;

[0038] Figure 13 for Figure 10 A partial enlarged schematic diagram of point C in the middle.

[0039] The following are marked in the accompanying drawings:

[0040] 1. Existing foundation concrete; 2. Vertical structural reinforcement; 3. Foundation flange; 4. Diagonal tensile reinforcement; 5. Tower; 6. Foundation flange; 7. Skirt; 8. New concrete; 9. Stirrups; 10. Foundation ring; 11. Foundation cone; 12. Longitudinal reinforcement mesh; 13. Transverse reinforcement mesh; 14. Horizontal ring bracing bars; 15. Horizontal thick reinforcement; 16. Conical hole; 17. Conical extrusion component; 18. Mounting bracket; 19. Threaded rod; 20. Ring connector; 21. Mounting tube; 22. Prestressed spring; 23. Ring stopper; 24. Mandrel; 25. Conical sealing component; 26. Clamping spring; 27. Through hole; 28. Flexible grouting pipe; 29. ​​Steel plate. DETAILED DESCRIPTION

[0041] Example 1

[0042] like Figures 9 to 13As shown, the present invention provides a wind turbine foundation reinforcement device acting on the original foundation concrete 1 of the wind turbine, including a newly added concrete foundation 8 arranged above the original concrete foundation, the original concrete foundation including a foundation ring 10 and the original foundation concrete 1; the original foundation concrete 1 is wrapped around the side and bottom of the foundation ring 10, and the height of the original foundation concrete 1 is lower than the height of the foundation ring 10; steel bars are arranged in the original foundation concrete 1.

[0043] Specifically, a longitudinal steel mesh 12 is set up around the outside of the original foundation concrete 1, and the longitudinal steel mesh 12 is welded to the steel bars of the foundation truncated cone part 11; a transverse steel mesh 13 is set up on the top of the original foundation concrete 1, and the longitudinal steel mesh 12 and the transverse steel mesh 13 are welded together, and the transverse steel mesh 13 is welded to the steel bars in the original foundation concrete 1; a downwardly inclined tensile steel bar 4 is set in the transverse steel mesh 13, and a skirt plate 7 is welded to the foundation ring 10 within the range of the transverse steel mesh 13, and one end of the tensile steel bar 4 is welded to the foundation ring 10 within the range of the transverse steel mesh 13. It is welded to the skirt plate 7, with its other end pointing diagonally downward toward the longitudinal reinforcement mesh 12. Multiple layers of horizontal thick steel bars 15 are installed inside the foundation ring 10, one end of which is bent a certain length and welded to the foundation ring 10. Vertical structural steel bars 2 are installed within the longitudinal reinforcement mesh 12, and the other end of the tensile steel bar 4 is welded to the top of the vertical structural steel bar 2. Stirrups 9 are welded at the junction of the vertical structural steel bar 2 and the tensile steel bar 4. New concrete 8 is poured over the longitudinal reinforcement mesh 12, transverse reinforcement mesh 13, vertical structural steel bars 2, stirrups 9, and tensile steel bars 4. A foundation lower flange 3 is installed at the lower end of the foundation ring 10, and an upper foundation flange 6 is installed on the side wall of the foundation ring 10 above the transverse reinforcement mesh 13. Several tensile steel bars 4 are welded to the skirt plate 7 of the foundation ring 10. The number of vertical structural steel bars 2 matches the number of tensile steel bars 4. A tower 5 is installed at the top of the foundation ring 10.

[0044] Of course, in this embodiment, the longitudinal steel mesh 12 needs to be extended and anchored into the structure of the base frustum part 11 to enhance the integrity of the new and old structures. Therefore, it is necessary to pre-drill steel bar holes in the base frustum part 11 near the cylinder. There are two ways to determine the position of the steel bar holes:

[0045] (1) Pre-drill Ø20~24 holes in the original foundation concrete 1 foundation cone part 11 near the column. The spacing between the vertical reinforcement holes is too close, which will reduce the overall pull-out resistance of the reinforcement. It is best not to exceed 240mm.

[0046] (2) Excavate at the plane point of the longitudinal reinforcement in the original foundation concrete 1 until a certain length of the original longitudinal reinforcement mesh 12 is exposed, and at least 160 mm is excavated for welding.

[0047] Specifically, it is recommended to adopt step (2) as the actual method. This step is an important way to transmit force between the fan foundation ring 10 and the newly poured concrete. By welding the new and old steel bars, it is ensured that the fan foundation root is jointly stressed when bearing lateral wind loads, so that the bending moment is more evenly distributed. Under the premise that the concrete cross-sectional area remains almost unchanged, the principal compressive stress of the concrete at the foundation ring 10 can be effectively reduced.

[0048] In this example, similar to the installation method of the longitudinal steel mesh 12, a transverse steel mesh 13 is installed on the top of the original foundation concrete 1, and the longitudinal steel mesh 12 and the transverse steel mesh 13 are connected by welding. The transverse steel mesh 13 is welded to the steel bars in the original foundation concrete 1 to form a radial extension of the original concrete longitudinal steel mesh 12.

[0049] In this example, an inclined annular skirt plate 7 with an inner diameter of 440 mm and an outer diameter of 500 mm is welded to the wall of the base ring 10 within the transverse reinforcement mesh 13. Tensile bars 4 are arranged downwardly and angled within the transverse reinforcement mesh 13. The top end of the tensile bar 4 overlaps the skirt plate 7, parallel to the skirt plate 7, and the other end points downwardly and angled toward the longitudinal reinforcement mesh 12. Vertical structural bars 2 are arranged within the longitudinal reinforcement mesh 12, and the bottom end of the tensile bar 4 is connected to the top end of the vertical structural bar 2 by welding.

[0050] In this example, multiple layers of horizontal coarse steel bars 15 are arranged on the inner side of the foundation ring 10, one end of which is bent to a certain length and then welded to the foundation ring 10 to ensure the connection strength. When the concrete inside the foundation ring 10 is under pressure, the hoop effect of the foundation ring 10 will increase the radial compressive stress of the internal concrete, making it in a three-dimensional stress state. The presence of the horizontal coarse steel bars increases the radial compressive strength of the concrete inside the foundation ring 10 and enhances its compressive resistance. At the same time, the horizontal coarse steel bars 15 are welded to the foundation ring 10 to form a whole, and the physical structure enhances the bonding and friction, reduces the relative displacement between the foundation ring 10 and the concrete inside it, and works better in coordination to withstand external loads as a whole.

[0051] In this example, four horizontal ring-shaped reinforcement bars 14 are installed, and stirrups 9 are placed around the horizontal ring-shaped reinforcement bars 14 at the junction of the vertical structural reinforcement bars 2 and the tensile reinforcement bars 4 to ensure reliable anchoring of the diagonal tensile reinforcement bars 4 to the concrete. In practice, the presence of the tensile reinforcement bars 4, together with the concrete, bears the tensile force of the foundation structure on the tensile side of the foundation ring 10, reducing or preventing cracks in the concrete in the tensile zone, thereby preventing damage to the foundation from wind and rain erosion, and effectively improving the wind turbine foundation's ability to withstand horizontal external loads.

[0052] In this example, a formwork is constructed using a longitudinal reinforcement mesh 12, a transverse reinforcement mesh 13, vertical structural reinforcement 2, stirrups 9, tensile reinforcement 4, horizontal annular frame bars 14, and horizontal coarse reinforcement 15 as a reinforcement framework. Concrete is then poured within the formwork to form additional concrete 8. This additional concrete 8 surrounds the sidewalls of the foundation ring 10, with its lower end positioned on the slope of the existing foundation concrete 1 and extending radially a certain distance. A lower foundation flange 3 is provided at the lower end of the foundation ring 10, and an upper foundation flange 6 is provided on the sidewalls of the foundation ring 10 above the transverse reinforcement mesh 13.

[0053] In the above-mentioned example of the method for reinforcing the wind turbine foundation by adding oblique tensile steel bars 4, the first layer of Φ25 main steel bars is arranged at 0.2m from the top surface, the second layer of main steel bars is arranged at 0.35m from the first layer, and the third layer of main steel bars is arranged at 0.35m from the second layer. In the above-mentioned example of the method for reinforcing the wind turbine foundation by adding oblique tensile steel bars 4, one main steel bar is arranged every 7.5°. In the above-mentioned example of the method for reinforcing the wind turbine foundation by adding oblique tensile steel bars 4, a Ф16 steel mesh is laid in the concrete. In the above-mentioned example of the method for reinforcing the wind turbine foundation by adding oblique tensile steel bars 4, holes are drilled on the surface of the old concrete to lay the steel mesh, which is alternately penetrated 15cm and 30cm into the old concrete surface and welded to the old steel bars. The steel meshes inside and outside the steel sleeve are welded to the surface of the steel sleeve respectively.

[0054] By arranging oblique tensile steel bars 4 at the upper end of the foundation ring 10, the burial depth of the foundation ring 10 is increased. The increase in the burial depth has a very obvious effect on reducing the maximum principal compressive stress of the concrete. At the same time, it also strengthens the connection between the foundation ring 10 and the foundation concrete, expands the compression surface and lever length of the concrete under the action of lateral bending moment and horizontal force, reduces horizontal stress, and increases the foundation's load-bearing cross-sectional area through the newly added radial concrete, thereby strengthening the foundation's lateral constraint on the fan foundation ring 10. After reinforcement, the bearing capacity of the fan foundation is significantly improved.

[0055] By adding new concrete, the total overhang length of the base of the original foundation is reduced, the angle between the plumb line at the edge of the column and the line connecting the edge of the base is reduced, and the safety factor is increased. From the perspective of the base force of the rigid expanded foundation, the bending tensile stress and shear stress that can be sustained are both improved.

[0056] like Figure 1-8In order to further strengthen the reinforcement capacity of the wind turbine foundation on the basis of the newly added concrete 8 and improve the reinforcement effect of the wind turbine foundation, a tapered hole 16 is opened in the middle of the newly added concrete 8 (it is not difficult to understand that in order to avoid interference, the flange 6 on the foundation needs to be cancelled in this solution, or it needs to be buried in the newly added concrete 8). The tapered hole 16 surrounds the wind turbine tower 5 or the foundation ring 10, and the newly added concrete 8 is provided with a number of mounting brackets 18 evenly distributed around the circumference of the tower 5. In this specific embodiment, the number of mounting brackets 18 is 4, and the mounting bracket 18 is a mirror-inverted L-shape. One end of the mounting bracket 18 is connected to the newly added concrete 8. The specific connection method is to weld one end of the mounting bracket 18 to the steel bar of the foundation of the newly added concrete 8, and the other end of the mounting bracket 18 is located above the tapered hole 16, and is provided with a threaded rod 19 threadedly connected thereto. A mounting cylinder 21 is provided on the outer side of the end of the threaded rod 19, and one end of the mounting cylinder 21 is welded and fixed to the lower surface of the mounting bracket 18. A prestressed spring 22 is provided inside, one end of the prestressed spring 22 is fixedly connected to the end of the screw, preferably, an annular connecting block 20 is provided at the end of the threaded rod 19, the end of the prestressed spring 22 is fixed to the annular connecting block 20, a push rod 24 is provided on the other end of the prestressed spring 22, one end of the push rod 24 is fixed to the other end of the spring, preferably, an annular limit block 23 is provided on the push rod 24, the other end of the push rod 24 extends out of the mounting tube 21, and is slidably connected to the mounting tube 21, A matching conical extrusion component 17 is provided in the conical hole 16. The conical extrusion component 17 can be understood as a funnel shape, and the middle part matches the diameter of the tower 5. The middle part of the conical extrusion component 17 is slidably sleeved on the tower 5. The sleeve-on method can be sleeved and then welded. Of course, it can also be pre-sleeved on the tower 5 when installing the wind turbine. One end of the conical extrusion component 17 is located in the conical hole 16, and the other end of the conical extrusion component 17 is in close contact with the end of the top rod 24 located on the outside of the mounting tube 21.

[0057] The working principle of the above technical solution is:

[0058] When the tower 5 is under the action of external load for a long time, the vibration or swing of the tower 5 will cause the connection between it and the newly added concrete 8 to be continuously worn and consumed, resulting in the problem of gaps. Therefore, in the present technical solution, a tapered hole 16 is pre-set, and the prestressed spring 22 can be compressed by adjusting the threaded rod 19, so that the prestressed spring 22 gives the tapered extrusion component 17 an extrusion prestress, so that it fills the gap between the tower 5 and the tapered hole 16. After a period of use, if the gap between the tapered hole 16 and the tower 5 increases due to the wear of the newly added concrete 8, the prestressed spring 22 can be compressed by adjusting the threaded rod 19, so that the prestressed spring 22 gives the tapered extrusion component 17 an extrusion prestress, so that the prestressed spring 22 can fill the gap between the tower 5 and the tapered hole 16. Under the action of the stress spring 22, the conical extrusion component 17 will move downward, that is, the part with a larger diameter of the conical extrusion component 17 will fill the enlarged gap, thereby limiting the swing amplitude of the tower 5, and thereby limiting the speed at which the gap gradually expands from top to bottom. It can also be understood that the range of gap enlargement is always controlled at the upper end of the newly added concrete 8. Of course, the taper of the conical extrusion component 17 is small and can be determined according to the degree of wear (the taper drawn in the figure is larger for ease of observation and understanding. In actual use, the taper has a smaller impact, that is, reducing the distance between the side of the conical component and the conical hole 16).

[0059] It should be noted that the conical hole 16 on the newly added concrete 8 can be set as an upper cylindrical hole and a lower conical hole, the conical sealing component 25 is set in the lower conical hole, and the conical extrusion component 17 is set in the upper cylindrical hole. In this way, the larger position of the conical extrusion component 17 contacts the upper end of the upper cylindrical hole, and the smaller part of the conical extrusion component 17 is located in the upper cylindrical hole. When the conical extrusion component 17 moves downward, there will be no contact interference problem, and the conical sealing component 25 is set in the lower conical hole to better achieve the extrusion sealing effect.

[0060] Of course, it is not difficult to understand that the main purpose of this technical solution is to adaptively fill the size of the gap and then control the speed of the gap development. If after long-term use, the conical pressure component on one side of the tower 5 moves downward too deeply, and the downward movement on the opposite side is smaller, resulting in a slight tendency of extrusion and tilting of the tower 5, the threaded rod 19 can be manually twisted to adjust the depth of the conical extrusion component 17 when the tower 5 is not subjected to or receives a small load, thereby achieving the correction of the tower 5.

[0061] In one feasible manner, a conical sealing component 25 is further provided in the conical hole 16, the middle part of the conical sealing component 25 is slidably sleeved on the tower 5, and the conical sealing component 25 is located below the conical extrusion component 17, and an installation spacing is provided between the conical sealing component 25 and the original foundation concrete 1, and the conical sealing component 25 and the conical extrusion component 17 are provided with a tightening spring 26, and the two ends of the tightening spring 26 are fixedly connected to the two respectively. The outer side surface of the conical sealing component 25 is preferably provided with a rubber layer, that is, its surface is in tight sealing contact with the newly added concrete 8 and the tower 5, which can prevent rainwater from entering and penetrating into the original concrete through the gap. In this specific embodiment, the newly added concrete foundation can reinforce the original concrete foundation and enhance the stability of the tower. At the same time, when controlling the gap, the gap is controlled on the newly added concrete to avoid spreading downward to the original concrete, that is, the purpose of protecting the original concrete is achieved by sacrificing the newly added concrete, which also serves as a method of protection and reinforcement.

[0062] In one practicable embodiment, the conical extrusion component 17 and the conical sealing component 25 are both hollow, and a number of annularly distributed through holes 27 are provided on both ends of the conical extrusion component. The through hole 27 on one end of the conical sealing component 25 points to the connection part between the original foundation concrete 1 and the tower 5, and a flexible grouting pipe 28 is provided on the through hole 27 on the other end of the conical sealing component 25. One end of the flexible grouting pipe 28 is fixedly connected to the through hole 27 of the conical sealing component 25, and the other end of the flexible grouting pipe 28 passes through the through hole 27 of the conical extrusion component 17 and extends to the outside of the conical extrusion component 17.

[0063] The advantage of this arrangement is that after long-term use, gaps will inevitably appear between the original concrete and the tower 5. Therefore, the gaps can be repaired by grouting through the flexible grouting pipe 28. Under the action of the holding spring 26, the conical sealing component 25 is always in contact with the newly added concrete 8 and the tower 5 to achieve sealing. Therefore, during grouting, the slurry will not be injected into the upper space of the conical hole 16.

[0064] Preferably, the outside of the newly added concrete 8 is provided with a steel plate 29 covering its surface, and one end of the mounting frame 18 is fixed to the steel plate 29. Specifically, steel plates 29 or relatively dense steel meshes are provided on the side and top surfaces of the newly poured annular concrete. The steel plates 29 or steel meshes should be welded to the steel bars in the newly added concrete 8.

[0065] It can be understood that when tower 5 is subjected to horizontal wind loads and undergoes lateral displacement in direction a, it compresses the newly poured concrete 8 on side a. Once the wind load changes direction to direction b, a crack forms on side a, which the tapered member on side a then fills. For side a, the initial lateral pressure of tower 5 and the subsequent downward pressure of the tapered member both exert lateral pressure on the newly poured concrete on side a. This, combined with the steel plates 29 or steel mesh on the side and top surfaces, helps create a triaxial stress state, completely enveloping the newly poured concrete, thereby increasing its bearing capacity and limiting the rate of crack development.

[0066] Example 2

[0067] The difference between Example 2 and Example 1 is that the conical extrusion component 17 in Example 1 is a whole, and the conical component in Example 2 is composed of several independent arc-shaped extrusion components, and each arc-shaped extrusion component is provided with a mounting frame 18, a threaded rod 19, a prestressed spring 22 and a top rod 24. This is to ensure the downward movement effect of the conical extrusion component 17. Because the load force direction of the tower 5 is different, and the newly added concrete 8 has different degrees of wear in different directions, it can be understood that the wear is more serious in the direction of long-term external load, that is, the downward movement depth of the conical extrusion component 17 in this direction is greater. If it is a whole, the downward movement depth will be limited by the gap at the position with less wear. It is set as multiple independent arc-shaped extrusion components to adapt to the wear in all directions, that is, it can be used when the tower 5 is unevenly stressed. Although the downward movement effect of the conical extrusion component 17 is relatively poor, it can also be used in scenarios where the load in all directions of the tower 5 is relatively uniform.

[0068] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A wind turbine foundation reinforcement device acting on the original foundation concrete of the wind turbine, arranged above the original concrete foundation, characterized in that: The utility model comprises a newly added concrete foundation arranged above the original concrete foundation, wherein a tapered hole is opened in the middle of the newly added concrete foundation, and the tapered hole surrounds the wind turbine tower, and a plurality of mounting brackets are evenly distributed around the circumference of the tower are provided on the newly added concrete foundation, one end of the mounting bracket is connected to the newly added concrete foundation, and the other end of the mounting bracket is located above the tapered hole and is provided with a threaded rod threadedly connected thereto, a mounting cylinder is provided on the outer side of the end of the threaded rod, one end of the mounting cylinder is fixed to the surface of the mounting bracket, a prestressed spring is provided inside the mounting cylinder, one end of the prestressed spring is fixedly connected to the end of the threaded rod, and a push rod is provided on the other end of the prestressed spring, one end of the push rod is fixed to the other end of the prestressed spring, the other end of the push rod extends out of the mounting cylinder and is slidably connected to the mounting cylinder, a matching tapered extrusion component is provided in the tapered hole, the middle part of the tapered extrusion component is slidably sleeved on the tower, one end of the tapered extrusion component is located in the tapered hole, and the other end of the tapered extrusion component is in close contact with the end of the push rod located outside the mounting cylinder; A conical sealing component is also provided in the conical hole, the middle part of the conical sealing component is slidably sleeved on the tower, and the conical sealing component is located below the conical extrusion component, the conical sealing component and the conical extrusion component are provided with a tightening spring, and the two ends of the tightening spring are fixedly connected to the two respectively; the conical extrusion component and the conical sealing component are both hollow, and a number of annularly distributed through holes are provided on both ends of the two, the through hole on one end of the conical sealing component points to the connection part between the original foundation concrete and the tower, and the conical sealing component is provided with a conical sealing component. A flexible grouting pipe is provided on the through hole on the other end of the component, one end of the flexible grouting pipe is fixedly connected to the through hole of the conical sealing component, and the other end of the flexible grouting pipe passes through the through hole of the conical extrusion component and extends to the outside of the conical extrusion component; the conical hole includes an upper cylindrical hole and a lower conical hole, the conical extrusion component is arranged in the upper cylindrical hole, and the conical sealing component is arranged in the lower conical hole; the newly added concrete surrounds the side wall of the foundation ring, and the lower end is located on the inclined surface of the original foundation concrete and extends radially for a certain distance.

2. The wind turbine foundation reinforcement device acting on the original foundation concrete of the wind turbine according to claim 1, characterized in that: A steel plate covering the surface of the newly added concrete is provided on the outside, and one end of the mounting bracket is fixed on the steel plate.

3. The wind turbine foundation reinforcement device acting on the original foundation concrete of the wind turbine according to claim 1, characterized in that: The tapered extrusion component is composed of a plurality of independent arc-shaped extrusion components.

4. The wind turbine foundation reinforcement device acting on the original foundation concrete of the wind turbine according to claim 1, characterized in that: The newly added concrete foundation includes vertical structural steel bars, oblique tensile steel bars, skirt plates, newly added concrete, stirrups, longitudinal steel mesh, transverse steel mesh, horizontal annular frame bars and horizontal thick steel bars; the original concrete foundation includes the foundation frustum, original foundation concrete, tower tube and foundation ring; A longitudinal steel mesh is set up around the outside of the original foundation concrete, and the longitudinal steel mesh is welded to the steel bars in the foundation truncated cone; a transverse steel mesh is set up on the top of the original foundation concrete, and the longitudinal steel mesh and the transverse steel mesh are welded, and the transverse steel mesh is welded to the steel bars in the original foundation concrete; The transverse steel mesh is provided with oblique tensile steel bars pointing downward, and a skirt plate is welded on the foundation ring within the range of the transverse steel mesh. One end of the oblique tensile steel bar is welded to the skirt plate, and the other end points obliquely downward to the longitudinal steel mesh; multiple layers of horizontal coarse steel bars are provided on the inner side of the foundation ring, wherein one end of the horizontal coarse steel bars is bent and welded to the foundation ring; vertical structural steel bars are provided in the longitudinal steel mesh, and the other end of the oblique tensile steel bar is welded to the top of the vertical structural steel bar; stirrups are welded at the connection between the vertical structural steel bars and the oblique tensile steel bars; the tower is provided on the top of the newly added concrete foundation, and newly added concrete is poured on the longitudinal steel mesh, transverse steel mesh, vertical structural steel bars, stirrups and oblique tensile steel bars.

5. The wind turbine foundation reinforcement device acting on the original foundation concrete of the wind turbine according to claim 4, characterized in that: A foundation lower flange is provided at the lower end of the foundation ring, a foundation upper flange is provided on the side wall of the foundation ring above the transverse steel mesh, and a plurality of oblique tensile steel bars are welded on the skirt plate of the foundation ring; the number of the vertical structural steel bars is consistent with the number of the oblique tensile steel bars.

6. The wind turbine foundation reinforcement device acting on the original foundation concrete of the wind turbine according to claim 4, characterized in that: Four horizontal annular frame bars are provided in the newly added concrete, and stirrups are provided at the connection points of the vertical structural steel bars and the oblique tensile steel bars, and the three are connected in pairs by welding.

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