A kind of wind power steel tower cylinder pit defect dome pushing device

Abstract

The utility model provides a kind of wind power steel tower drum pit defect dome pushing device, fixed crossbeam is fixed to the outer periphery of the tower drum containing pit defect in wind power steel tower drum axial direction, inside steel beam is through the inside of tower drum along the direction of tower drum axis, and is set up opposite pit defect area, outside steel beam is arranged in the outer wall of tower drum along the direction of tower drum axis and corresponds pit defect area, inside limiting assembly is used to limit the displacement of inside steel beam in horizontal direction, outside limiting assembly is used to limit the displacement of outside steel beam in horizontal direction.The utility model fixed crossbeam surrounds tower drum circumferentially and is rigidly anchored to the outer wall of both ends, forms the stable support counterforce system, inside steel beam is through inside along the direction of tower drum axis, is aligned with pit center, and outside steel beam is arranged in longitudinal adhesion on outer wall, and is in radial alignment with inside steel beam, so that pushing force and reaction force form closed force system in the direction of tower drum wall thickness, improve energy utilization efficiency, avoid eccentric bending moment or local instability caused by one-side loading.

Description

Technical Field

[0001] This utility model belongs to the technical field of wind power steel towers, specifically a device for rounding and pushing back pit defects in wind power steel towers. Background Technology

[0002] With the rapid development of my country's wind power industry, the capacity of individual wind turbine units continues to increase, and the height of the supporting steel towers generally exceeds 100 meters, with diameters reaching over 5 meters and wall thicknesses typically between 20 and 50 mm. These large, thin-walled cylindrical structures are highly susceptible to localized dents during manufacturing, transportation, hoisting, and on-site installation due to collisions, compression, or improper local support. Although these dents often do not cause penetrating damage, they disrupt the original geometric roundness of the tower, leading to increased stress concentration during service, reduced fatigue life, and in severe cases, inducing crack initiation or even structural failure. Therefore, efficient, safe, and high-quality on-site repair of dent defects has become a critical technical challenge urgently needing to be addressed in the wind power operation and maintenance field.

[0003] Currently, the industry mainly relies on traditional manual or semi-mechanized methods for repairing tower dents, which mainly include the following categories: First, the manual hammering method: Workers use sledgehammers or pneumatic hammers to repeatedly strike the dented area from inside the tower, attempting to round it off through plastic deformation. This method relies entirely on the operator's experience, and the direction of loading is difficult to control, easily leading to over-hammering or under-repair in certain areas. Furthermore, the impact load from hammering can introduce microcracks or work-hardened layers into the base material, reducing its toughness. Additionally, the uncontrollable range of hammering often causes bulging or corrugated deformation in the surrounding intact areas, creating a vicious cycle of "repairing one area, damaging the entire area." Second, the localized heating correction method: This involves applying uneven heat treatment to the area surrounding the pit using flame or electric heating, utilizing the principle of thermal expansion and contraction to induce material rebound. However, this method has technical drawbacks: on the one hand, high temperatures can alter the metallographic structure of the steel, weakening the strength and fatigue resistance of the tower base material; on the other hand, the heat-affected zone is difficult to control, easily triggering new residual stress fields, and even leading to embrittlement and cracking of the weld heat-affected zone.

[0004] To address this issue, a device for rounding and pushing back the pits in wind turbine steel towers is provided to solve the aforementioned problem. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides a device for rounding and pushing back the pit defects of wind power steel towers, so as to at least partially solve the above technical problems.

[0006] The technical solution adopted by this utility model is as follows: This utility model proposes a device for rounding back the pit defects in wind turbine steel towers, comprising: The fixed crossbeam is fixed to the outer periphery of both ends of the tower tube containing the pit defect along the axial direction of the wind turbine steel tower tube; The inner steel beam runs through the interior of the tower along the tower axis and is positioned directly opposite the pit defect area. The outer steel beam is attached to the outer wall of the tower along the tower axis and corresponds to the pit defect area. A steel fixing strip is horizontally positioned above the inner and outer steel beams, pressing them together against the top surface of the fixing beam; The inner limiting assembly includes an upper limit device for the inner crossbeam and a lower limit device for the inner crossbeam, used to limit the displacement of the inner steel beam in the horizontal direction; The outer limiting assembly includes an upper limit device for the outer crossbeam and a lower limit device for the outer crossbeam, used to limit the displacement of the outer steel beam in the horizontal direction; An end fixing plate is fixed to the end face of the inner steel beam near the pit defect. The top extension end is installed on the end fixing plate, and its axis is aligned with the center of the tower recess. The jacking device is mounted on the end fixing plate and located behind the jacking end, and is used to apply axial jacking force to round off the pit area.

[0007] As a further improvement of this utility model: the fixed crossbeam, the inner steel beam and the outer steel beam are all configured as rectangular cross-section structures; The fixed crossbeam surrounds the circumference of the tower and is fixed to the outer walls at both ends of the tower. The inner steel beam penetrates the interior of the tower and its length direction coincides with the tower axis. The outer steel beam is arranged longitudinally along the outer wall of the tower, and its position corresponds to that of the inner steel beam in the radial direction of the tower, and it covers the area where the pit defect is located.

[0008] As a further embodiment of this utility model: the steel fixing strip is arranged laterally along the cross-sectional direction of the tower, and its bottom surface presses against the top of the inner steel beam and the outer steel beam at the same time. It is detachably connected to the side surface of the fixing beam by end bolts. The end bolts are high-strength bolts, forming an assembled connection structure.

[0009] As a further embodiment of this utility model: in the inner limiting assembly, the upper limit device of the inner crossbeam is inserted into the limiting hole opened by the steel fixing strip in the form of a pin, and the lower limit device of the inner crossbeam is fixed to the opening position corresponding to the top surface of the fixing crossbeam by bolts; the upper limit device of the inner crossbeam and the lower limit device of the inner crossbeam cooperate with each other to constrain the position of the inner steel beam in the two horizontal directions of the tower's radial and circumferential directions.

[0010] As a further embodiment of this utility model: in the outer limiting assembly, the outer beam upper limit device is inserted into the limiting hole opened by the steel fixing strip in the form of a pin, and the outer beam lower limit device is fixed to the opening position corresponding to the top surface of the fixed beam by bolts; the outer beam upper limit device and the outer beam lower limit device cooperate with each other to constrain the position of the outer steel beam in the two horizontal directions of the tower's radial and circumferential directions.

[0011] As a further improvement of this utility model, it also includes two deformation limiting plates, which are welded to the outer steel beam on the side near the outer wall of the tower. The distance between the two deformation limiting plates is equal to the distance of the outer edge of the pit extending outward by one tower wall thickness. The welding end of the deformation limiting plate is set as a rectangular structure, and its contact end with the tower is an arc surface with the same curvature as the outer wall of the tower. The radius of the arc surface is the same as the radius of the tower, and its circumferential coverage is three times the arc length of the pit.

[0012] As a further embodiment of this utility model: the end fixing plate is a rectangular steel plate, which is welded and fixed to the end face of the inner steel beam facing the pit defect; the end fixing plate serves as the mounting base of the jacking actuator, and its plane is perpendicular to the tower axis.

[0013] As a further embodiment of this utility model: the top extension end is placed on the end fixing plate, its axis is aligned with the center of the tower recess, and the front end of the top extension end is an arc surface, the radius of curvature of which is consistent with the inner wall of the tower.

[0014] Implementing the embodiments of this utility model will have the following beneficial effects: This embodiment is based on a rectangular cross-section load-bearing frame consisting of a fixed crossbeam, an inner steel beam, and an outer steel beam. All three adopt a rectangular cross-section. The fixed crossbeam surrounds the circumference of the tower and is rigidly anchored to the outer walls at both ends, forming a stable support reaction system. The inner steel beam runs through the interior along the tower axis and is aligned with the center of the recess. The outer steel beam is arranged longitudinally on the outer wall and is radially aligned with the inner steel beam, so that the jacking force and reaction force form a closed force system in the direction of the tower wall thickness, improving energy utilization efficiency and avoiding eccentric bending moment or local instability caused by unilateral loading. This embodiment utilizes a prefabricated compression connection structure composed of steel fixing strips and high-strength end bolts to effectively integrate the inner and outer load-bearing beams, forming a spatial truss effect. The strips are transversely spanning the tops of the two beams and are detachably connected to the side facade of the fixed crossbeams via high-strength bolts. This ensures the shear and slip resistance of the nodes under loads of hundreds of kilonewtons while also meeting the requirements for rapid on-site installation and reuse. In this embodiment, two limiting plates are welded to the outer steel beam near the tower. The spacing is set to "one wall thickness extending outward from the outer edge of the pit". The radius of the inner arc surface is consistent with that of the tower. The circumferential coverage reaches three times the arc length of the pit, which is like setting a "rigid mold" on the outer wall of the tower. This effectively cuts off the propagation path of the plastic deformation wave, strictly limits the repair effect to the target area, and prevents bulges, ripples or residual stress concentration in non-defect areas due to stress diffusion, so as to achieve "accurate repair without harming the neighbors".

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the wind turbine steel tower pit defect rounding and pushing device proposed in the embodiment of this utility model.

[0018] Figure 2 This is a side view of the device for rounding back the pit defect in the wind turbine steel tower according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the deformation limiting plate of the wind turbine steel tower pit defect recovery and jacking device proposed in this embodiment of the utility model.

[0020] In the diagram: 1. Deformation limiting plate, 2. Top extension end, 3. End fixing plate, 4. Top pushing device, 5. Outer steel beam, 6. Inner steel beam, 7. Upper limit device for outer crossbeam, 8. Lower limit device for outer crossbeam, 9. Upper limit device for inner crossbeam, 10. Lower limit device for inner crossbeam, 11. Fixed crossbeam, 12. Steel fixing strip, 13. End bolt, 14. Tower.

[0021] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0022] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0023] It is important to note that the terms "first," "second," etc., are used only to distinguish between descriptive and positional descriptions, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with "first," etc., may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features. In the embodiments of this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the accompanying drawings and specific circumstances.

[0024] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0025] like Figures 1 to 3 As shown, a jacking device for rounding back the pit defect of a wind turbine steel tower includes: a fixed crossbeam 11 fixed along the axial direction of the wind turbine steel tower 14 to the outer periphery of both ends of the tower 14 containing the pit defect; The inner steel beam 6 runs through the interior of the tower 14 along the axial direction of the tower 14 and is set directly opposite the pit defect area; the outer steel beam 5 is arranged close to the outer wall of the tower 14 along the axial direction of the tower 14 and corresponds to the pit defect area. The steel fixing strip 12 is horizontally spanned above the inner steel beam 6 and the outer steel beam 5, and together presses the two against the top surface of the fixing beam 11; The inner limiting assembly includes an inner crossbeam upper limit device 9 and an inner crossbeam lower limit device 10, which are used to limit the displacement of the inner steel beam 6 in the horizontal direction; the outer limiting assembly includes an outer crossbeam upper limit device 7 and an outer crossbeam lower limit device 8, which are used to limit the displacement of the outer steel beam 5 in the horizontal direction. The end fixing plate 3 is fixed on the inner steel beam 6 near the side end face of the pit defect. The jacking end 2 is installed on the end fixing plate 3, and its axis is aligned with the center of the pit in the tower 14. The jacking device 4 is set on the end fixing plate 3 and located behind the jacking end 2, and is used to apply axial jacking force to make the pit area rounded.

[0026] In a specific application of this utility model embodiment, the device first rigidly fixes the fixed crossbeam 11 along the axial direction of the tower 14 to the outer peripheral wall at both ends of the area containing the pit defect. The fixed crossbeam not only serves as the installation platform for the inner steel beam 6 and the outer steel beam 5, but also acts as a force reaction support, effectively resisting the reverse thrust generated by the jacking device 4 during the jacking process, preventing the overall structure from becoming unstable. On this basis, the inner steel beam 6 penetrates the interior of the tower along the tower axis and is accurately aligned with the center of the pit; at the same time, the outer steel beam 5 is longitudinally arranged along the outer wall of the tower in the corresponding area of ​​the pit. The two form a symmetrical mechanical configuration of "inward pushing and outward supporting" in the radial direction of the tower. The coordinated arrangement of the inner and outer beams allows the jacking force to act directly on the inner surface of the pit through the inner steel beam 6, while the outer steel beam 5 restricts the excessive expansion or deformation of the outer wall of the tower in non-target areas during the stress process through its rigid support, thereby concentrating the repair energy in the defect area.

[0027] To ensure the correct spatial relationship between the inner steel beam 6 and the outer steel beam 5 during the jacking process, the device employs steel fixing strips 12 horizontally spanning the tops of the two beams and pressing them together against the top surface of the fixed crossbeam 11. These strips not only serve a connecting and compressing function but also, through their lateral stiffness, lock the inner and outer steel beams into a unified whole in the circumferential direction of the tower, preventing relative misalignment under stress. Simultaneously, the steel fixing strips 12 are detachably connected to the side of the fixed crossbeam 11 via end bolts 13, ensuring both ease of assembly and high strength and reliability of the connection points.

[0028] Furthermore, there are inner limiting components (composed of an upper limit device 9 and a lower limit device 10 on the inner crossbeam) and outer limiting components (composed of an upper limit device 7 and a lower limit device 8 on the outer crossbeam). The upper limit device is inserted into the preset hole of the steel fixing strip 12 in the form of a pin, while the lower limit device is fixed to the corresponding opening on the top surface of the fixing crossbeam 11 by bolts. The upper and lower limiting structures provide double restraint on the inner and outer steel beams in the horizontal plane (including the radial and circumferential directions of the tower), effectively suppressing their slippage, torsion or warping under the action of the jacking load, ensuring that the jacking force is always transmitted to the center of the pit along the path, and avoiding repair failure or new damage caused by eccentric loading.

[0029] Furthermore, the end fixing plate 3 is firmly welded to the inner steel beam 6 near the pit, serving as the mounting base for the jacking actuator. The jacking end 2 is mounted on the plate, its axis aligned with the geometric center of the tower pit. Its front end is an arc surface perfectly matching the curvature of the tower's inner wall, ensuring that the jacking contact surface is a continuous curved surface rather than a point or line contact, reducing the risk of local stress concentration and making the repair process closer to the ideal uniform loading state. The jacking device 4 is arranged on the end fixing plate 3, behind the jacking end 2, forming a complete force output link. When the jacking device is activated, its hydraulic drive structure pushes the telescopic arm forward, applying controllable axial thrust to the inner wall of the pit through the jacking end 2, causing the material to undergo reverse plastic flow and gradually restore its original roundness.

[0030] At the same time, two tower deformation limiting plates 1 are welded on the side of the outer steel beam 5 near the outer wall of the tower. The spacing between them is the distance from the outer edge of the pit to the thickness of the tower wall. The inner contour of the limiting plate is an arc surface consistent with the outer diameter of the tower. The circumferential coverage range is three times the arc length of the pit. This not only effectively defines the boundary of the repair area, but also strictly limits the plastic deformation caused by the jacking within the target range, preventing stress waves from spreading to the surrounding intact areas, thereby avoiding the generation of new microcracks or geometric distortions.

[0031] In one specific embodiment, the fixed crossbeam 11, the inner steel beam 6, and the outer steel beam 5 are all configured with rectangular cross-section structures. The fixed crossbeam 11 surrounds the tower cylinder 14 circumferentially and is fixed to the outer walls at both ends of the tower cylinder 14. The inner steel beam 6 penetrates the interior of the tower cylinder 14, and its length direction coincides with the axis of the tower cylinder 14. The outer steel beam 5 is arranged longitudinally along the outer wall of the tower cylinder 14, and its position corresponds to that of the inner steel beam 6 in the radial direction of the tower cylinder 14, and covers the area where the pit defect is located.

[0032] In the specific application of this utility model embodiment, before the work begins, two fixed crossbeams 11 are rigidly installed along the circumference of the tower 14 on the outer walls of both ends of the area containing the pit defect. Since the fixed crossbeams 11 have a rectangular cross-section, their wide surfaces can closely fit the curved surface of the tower 14 and be firmly connected by welding or high-strength bolts. This not only provides stable circumferential constraints but also establishes a reference plane for the subsequent positioning and installation of components. The two fixed crossbeams 11 bear the task of transmitting and dispersing all reaction forces. When the jacking device 4 applies axial thrust, the force is ultimately transmitted to the structures at both ends of the tower 14 through the inner steel beam 6 and the fixed crossbeams 11, and then balanced by the inherent stiffness of the tower 14, avoiding secondary damage caused by localized stress concentration.

[0033] The inner steel beam 6 penetrates the interior of the tower 14, with its axis coinciding with the centerline of the tower 14, ensuring that the jacking point is located at the geometric center of the recess. The steel beam also adopts a rectangular cross-section, with its height perpendicular to the axis of the tower 14, maximizing its bending section modulus when subjected to jacking reaction force, effectively resisting bending deformation caused by eccentric loading. Simultaneously, the straight sides of the rectangular cross-section facilitate full welding connection with the end fixing plate 3, ensuring that the jacking force is transferred seamlessly from the extended end 2 through the end fixing plate 3 to the main body of the steel beam, preventing the connection point from becoming a weak link.

[0034] Corresponding to the inner steel beam 6, the outer steel beam 5 is arranged longitudinally along the outer wall of the tower 14, covering the entire recessed area, and is accurately aligned with the inner steel beam 6 in the radial direction. The symmetrical layout of the inner and outer beams forms a mechanical closed loop of "inward pushing and outward supporting": when the inner steel beam 6 pushes forward against the inner wall of the recess, the outer steel beam 5 acts as an external supporting reaction surface, limiting the excessive bulging or local buckling of the outer wall of the tower 14 during the compression process. The outer steel beam 5 also adopts a rectangular cross section, with its wide side closely attached to the outer surface of the tower 14, forming a local rigid reinforcing band through welding with the deformation limiting plate 1 of the tower 14.

[0035] Furthermore, the three rectangular cross-section beams, the fixed crossbeams 11 at both ends, the inner steel beam 6 in the middle, and the outer steel beam 5 together constitute a three-dimensional spatial truss structure system. The fixed crossbeams 11 serve as transverse connectors, anchoring the inner and outer steel beams 5 together at both ends of the tower 14; the inner and outer steel beams 5 serve as longitudinal main load-bearing components, respectively undertaking the functions of thrust transmission and external constraint. At the same time, the contact surfaces between the rectangular sections are flat and the stress is uniform, which can form a good frictional self-locking effect under pre-tightening state, further enhancing the overall structure's anti-slip capability during dynamic jacking.

[0036] In one specific embodiment, in the inner limiting assembly, the inner beam upper limit device 9 is inserted into the limiting hole opened in the steel fixing strip 12 in the form of a pin, and the inner beam lower limit device 10 is fixed to the opening position corresponding to the top surface of the fixing beam 11 by bolts; the inner beam upper limit device 9 and the inner beam lower limit device 10 cooperate with each other to constrain the position of the inner steel beam 6 in the radial and circumferential horizontal directions of the tower 14.

[0037] In the outer limiting assembly, the outer beam upper limit device 7 is inserted into the limiting hole opened in the steel fixing strip 12 in the form of a pin, and the outer beam lower limit device 8 is fixed to the corresponding opening position on the top surface of the fixed beam 11 by bolts; the outer beam upper limit device 7 and the outer beam lower limit device 8 cooperate with each other to constrain the position of the outer steel beam 5 in the radial and circumferential horizontal directions of the tower 14.

[0038] In a specific application of this utility model embodiment, after the device has completed its initial assembly, the inner steel beam 6 penetrates the interior of the tower cylinder 14 and faces the recessed area, while the outer steel beam 5 is attached to the corresponding position on the outer wall of the tower cylinder 14. At this time, without effective limiting, the two steel beams are very likely to undergo slight displacement in the horizontal plane during the subsequent jacking process due to uneven force or initial installation deviation, which is enough to cause the jacking end 2 to deviate from the geometric center of the recess, resulting in local stress concentration, uneven rounding, and even causing new plastic wrinkles on the wall of the tower cylinder 14.

[0039] Taking the inner limiting component as an example: its upper limiter is inserted into the pre-drilled limiting hole of the steel fixing strip 12 in the form of a pin, with the pin extending vertically downward and closely abutting the two sides of the upper flange of the inner steel beam 6; at the same time, the lower limiter is firmly fixed to the corresponding opening on the top surface of the fixing beam 11 by high-strength bolts, supporting the bottom flange of the inner steel beam 6 from below, and limiting blocks are set on both sides of it. At the same time, any tendency of the inner steel beam 6 to move in the horizontal plane, whether it is radially outward along the tower 14 or circumferentially rotating and sliding, will be immediately subject to the "clamping and blocking" composite constraint formed by the upper and lower limiters. The upper limiter restricts its upward and lateral movement, while the lower limiter prevents it from sinking or sliding out laterally. Together, they form a closed horizontal limiting cavity, firmly locking the inner steel beam 6 in the preset position.

[0040] The outer limiting components are arranged in a completely symmetrical manner: the outer crossbeam upper limit device 7 is also inserted into the limiting hole of the steel fixing strip 12 by means of a pin, pressing the outer steel beam 5 from above; the outer crossbeam lower limit device 8 is anchored to the top surface of the fixed crossbeam 11 by bolts, providing support and lateral blocking from below. Since the outer steel beam 5 is in direct contact with the outer wall of the tower 14, its stability is not only related to its own positional accuracy, but also directly affects the control effect of the tower 14 deformation limiting plate 1 on the repair boundary. Once the outer steel beam 5 is displaced, the position of the limiting plate will shift accordingly, and it will be unable to effectively constrain the deformation diffusion of non-target areas.

[0041] Specifically, the upper limit switch uses a pin-type connection, which is convenient for quick insertion or removal and is suitable for frequent assembly and adjustment on site. The lower limit switch uses a bolt connection, which not only ensures shear and pull-out resistance for long-term use, but also allows for loosening for fine adjustment when needed.

[0042] Throughout the jacking process, as the jacking device 4 gradually applies axial thrust, the inner steel beam 6 bears the forward thrust, while the outer steel beam 5 bears the outward pressure from the reaction of the tower 14. At this time, the limiting component resists the lateral force caused by the thrust eccentricity or the curvature change of the tower 14 on the one hand, and suppresses the local recoil vibration caused by the plastic flow of the material on the other hand.

[0043] In one specific embodiment, it also includes two deformation limiting plates 1, which are welded to the outer steel beam 5 on the side near the outer wall of the tower 14. The distance between the two deformation limiting plates 1 extends outward from the outer edge of the pit by a distance equal to the wall thickness of the tower 14. The welding end of the deformation limiting plate 1 is set as a rectangular structure, and its contact end with the tower 14 is an arc surface with the same curvature as the outer wall of the tower 14. The radius of the arc surface is the same as the radius of the tower 14, and its circumferential coverage is three times the arc length of the pit.

[0044] The end fixing plate 3 is a rectangular steel plate, which is welded and fixed to the inner steel beam 6 on the side facing the pit defect; the end fixing plate 3 serves as the mounting base for the jacking actuator, and its plane is perpendicular to the axis of the tower 14.

[0045] In a specific application of this utility model embodiment, at the start of operation, the inner steel beam 6 penetrates the interior of the tower cylinder 14 and faces the center of the recess, while the outer steel beam 5 is attached to the corresponding area of ​​the outer wall of the tower cylinder 14. Two deformation limiting plates are firmly welded to the side of the outer steel beam 5 facing the tower cylinder 14. When the tower cylinder 14 is subjected to an inner thrust, the material undergoes reverse plastic flow. However, without boundary constraints, the flow will spread circumferentially and axially, causing bulges, ripples, or residual stress concentration in previously intact areas. By setting rigid limiting barriers at this spacing around the recess, the propagation path of the plastic deformation wave can be effectively interrupted, confining the repair effect to a local area centered on the recess with a width of approximately three wall thicknesses. This ensures a smooth return to the original shape while avoiding the common technical problem of "repairing one area and damaging the entire area."

[0046] Meanwhile, the side of the deformation limiting plate that contacts the tower 14 is not a flat or simple curved surface, but a custom-designed arc surface according to the outer diameter of the tower 14. Its radius is exactly the same as that of the tower 14 body, and its circumferential coverage is three times the original arc length of the recess. This large-area, high-fit curved surface contact allows the limiting plate to not only provide radial support reaction force during the jacking process, but also to form a continuous constraint band in the circumferential direction, preventing the tower 14 from buckling locally or becoming unstable in the circumference under stress. At the same time, its welded end adopts a rectangular structure, which facilitates full welding connection with the outer steel beam 5, ensuring that it will not tear or detach when subjected to reaction forces of hundreds of kilonewtons, thereby maintaining the integrity and reliability of the entire constraint structure.

[0047] Meanwhile, inside the tower 14, the end fixing plate 3 is firmly welded to the inner steel beam 6 on the side facing the pit. The plate is made of rectangular steel plate, so that its installation plane is strictly perpendicular to the axis of the tower 14. By welding the end fixing plate 3 to the inner steel beam 6 as a whole and pre-correcting it, it is ensured that the axes of the subsequently installed jacking end 2 and jacking device 4 are aligned with the geometric center of the pit, without the need for repeated on-site adjustments, thus improving work efficiency and accuracy.

[0048] During the actual jacking process, when the jacking device 4 is activated and pushes the jacking end 2 forward, the thrust is first evenly transmitted to the inner steel beam 6 through the end fixing plate 3, and then the inner steel beam 6 concentrates the load onto the inner wall of the pit. Due to the rigidity and flatness of the end fixing plate 3, and its position being locked by the inner limiting component, the entire loading process remains in a purely axial, non-eccentric state. At the same time, the outer deformation limiting plate wraps around the boundary of the area to be repaired from the outside, absorbing and dispersing the lateral expansion force generated by the rebound of the tower 14 on the one hand, and providing uniform counter pressure through its large-area arc surface on the other hand, allowing the material to gradually restore its original curvature under controlled conditions.

[0049] In one specific embodiment, the steel fixing strip 12 is arranged laterally along the cross-sectional direction of the tower 14. Its bottom surface presses against the top of the inner steel beam 6 and the outer steel beam 5, and is detachably connected to the side of the fixing beam 11 by end bolts 13. The end bolts 13 are high-strength bolts, forming an assembled connection structure.

[0050] The top extension end 2 is placed on the end fixing plate 3, and its axis is aligned with the center of the recess in the tower 14. The front end of the top extension end 2 is an arc surface, and the radius of curvature of the arc surface is consistent with the inner wall of the tower 14.

[0051] In a specific application of this utility model embodiment, after the device completes its initial positioning, the inner steel beam 6 has penetrated the interior of the tower cylinder 14 and is aligned with the center of the recess, while the outer steel beam 5 is also attached to the corresponding area of ​​the outer wall of the tower cylinder 14. At this time, the steel fixing strip 12 is transversely spanned across the top of the two steel beams along the cross-sectional direction of the tower cylinder 14, with its bottom surface fully contacting the upper flanges of the inner and outer steel beams 5 and applying pre-tightening pressure. This transverse pressing method not only integrates the two originally independent longitudinal load-bearing components into a whole load-bearing unit in the vertical direction, but also forms a rigid lock on their relative positions in the horizontal plane, preventing them from shifting, twisting, or separating due to uneven force during subsequent jacking.

[0052] Furthermore, the jacking end 2 is accurately placed on the end fixing plate 3, and its axis is calibrated to perfectly coincide with the geometric center of the recess in the tower 14. At the same time, the arc surface used at the front end of the jacking end 2 has a radius of curvature that is completely consistent with the inner wall of the tower 14, so that a continuous and complete surface contact is formed in the initial stage of jacking. As the thrust gradually increases, the contact area expands evenly, and the stress distribution tends to be gentle, effectively avoiding local crushing or microcrack initiation caused by traditional flat-head jacking rods.

[0053] Throughout the jacking process, the rigid connection system constructed by the steel fixing strips 12 and the highly adaptable loading interface of the jacking end 2 form a closed-loop synergy: when the jacking device 4 pushes the jacking end 2 forward, the thrust is transmitted to the inner steel beam 6 through the end fixing plate 3; the inner steel beam 6 attempts to move forward, but its top is firmly pressed down by the steel fixing strips 12, and the strips are anchored to the fixed crossbeam 11 by high-strength bolts, ultimately transmitting the reaction force to the structures at both ends of the tower 14 through the fixed crossbeam 11. At the same time, the outer steel beam 5 is also pressed down by the strips, and its position is also locked synchronously, thus ensuring that the inner and outer beams always maintain radial alignment during the stress process.

[0054] In one specific embodiment, the jacking device 4 is an intelligent CNC jacking structure, including a jacking extension device and a digital control structure. The jacking extension device includes a telescopic arm and a hydraulic drive unit to provide controllable jacking stroke and pressure. The digital control structure includes a control program module and a transmission device that communicates with the jacking extension device, which can monitor and adjust the jacking stroke, speed and reaction force in real time to achieve precise control of the pit rounding process.

[0055] In a specific application of this utility model embodiment, after the device completes structural assembly, including anchoring the fixed crossbeam 11, aligning the inner and outer steel beams, locking the limiting components, positioning the end head, and placing the deformation limiting plate, the operator starts the jacking device 4, and the structure immediately enters the automatic working mode. At this time, the digital control structure first performs self-check and initial calibration on the current state through the built-in sensor network (such as displacement encoders, pressure transmitters, and reaction force monitoring units) to confirm the alignment of the jacking end 2 with the center of the pit, whether the hydraulic structure oil pressure is normal, and whether each limit is in place. Once the safe start-up conditions are met, the control program module generates dynamic control commands based on preset repair parameters (such as target return radius, maximum allowable reaction force, and loading rate), and sends them to the hydraulic drive unit in real time through the transmission device.

[0056] Upon receiving the command, the hydraulic drive unit drives the telescopic arm to extend smoothly at a set speed, pushing the jacking end 2 to apply axial thrust to the inner wall of the tower 14. During this process, the structure implements closed-loop feedback control: the displacement sensor continuously collects the jacking stroke data, and the pressure sensor synchronously monitors the real-time pressure in the hydraulic chamber and converts it into the actual reaction force acting on the wall of the tower 14. The data is transmitted back to the control program module at a millisecond frequency, which dynamically adjusts the hydraulic output based on the preset mechanical model (such as the yield characteristics of the tower 14 material, the wall thickness-stiffness relationship, and the pit depth-springback coefficient). For example, when a sudden increase in reaction force is detected while the displacement stagnates, the structure will automatically determine that the material has entered the plastic yielding stage and immediately reduce the jacking speed to avoid overshoot; if the reaction force increases slowly but the displacement increases rapidly, it indicates that there is a risk of local instability in the pit area, and the structure will pause loading and issue a warning.

[0057] Furthermore, in the initial stage, low speed and small force are used for contact pre-compression to eliminate assembly gaps and establish a stable contact surface; in the middle stage, the main loading stage is entered, and the thrust is gradually increased according to the preset curve to induce controllable reverse plastic flow in the pit area; in the final stage, the system switches to fine-tuning mode to precisely correct the residual pits with micron-level steps until the target roundness is achieved.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0060] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A device for rounding back the pit defects in a wind turbine steel tower, characterized in that, include: A fixed crossbeam (11) is fixed to the outer periphery of both ends of the tower tube (14) containing pit defects along the axial direction of the wind power steel tower tube (14); The inner steel beam (6) runs through the interior of the tower tube (14) along the axis of the tower tube (14) and is set directly opposite the pit defect area; The outer steel beam (5) is attached to the outer wall of the tower (14) along the axial direction of the tower (14) and corresponds to the pit defect area; The steel fixing strip (12) is horizontally spanned above the inner steel beam (6) and the outer steel beam (5), and together they are pressed against the top surface of the fixing crossbeam (11); The inner limiting assembly includes an inner beam upper limit device (9) and an inner beam lower limit device (10) for limiting the displacement of the inner steel beam (6) in the horizontal direction; The outer limiting assembly includes an outer beam upper limit device (7) and an outer beam lower limit device (8) for limiting the displacement of the outer steel beam (5) in the horizontal direction; End fixing plate (3) is fixed to the end face of the inner steel beam (6) near the pit defect; The top extension end (2) is installed on the end fixing plate (3), and its axis is aligned with the center of the recess in the tower (14); The pusher (4) is set on the end fixing plate (3) and located behind the extension end (2) to apply axial pushing force to make the pit area rounded.

2. The device for rounding back the pit defect in the wind turbine steel tower according to claim 1, characterized in that, The fixed crossbeam (11), the inner steel beam (6) and the outer steel beam (5) are all designed with rectangular cross-sections. The fixed crossbeam (11) surrounds the tower (14) circumferentially and is fixed to the outer walls at both ends of the tower (14). The inner steel beam (6) penetrates the interior of the tower (14) and its length direction coincides with the axis of the tower (14). The outer steel beam (5) is arranged longitudinally along the outer wall of the tower (14), and its position corresponds to that of the inner steel beam (6) in the radial direction of the tower (14), and covers the area where the pit defect is located.

3. The device for rounding back the defects in the steel tower of a wind turbine as described in claim 1, characterized in that, The steel fixing strip (12) is arranged laterally along the cross section of the tower (14). Its bottom surface presses against the top of the inner steel beam (6) and the outer steel beam (5) at the same time, and is detachably connected to the side of the fixing beam (11) by end bolts (13). The end bolts (13) are high-strength bolts, forming an assembled connection structure.

4. The device for rounding back the pit defect in the wind turbine steel tower according to claim 1, characterized in that, In the inner limiting assembly, the inner beam upper limit device (9) is inserted into the limiting hole opened by the steel fixing strip (12) in the form of a pin, and the inner beam lower limit device (10) is fixed to the opening position corresponding to the top surface of the fixed beam (11) by bolts; the inner beam upper limit device (9) and the inner beam lower limit device (10) cooperate with each other to constrain the position of the inner steel beam (6) in the radial and circumferential horizontal directions of the tower (14).

5. The device for rounding back the concave defects in wind turbine steel towers according to claim 1, characterized in that, In the outer limiting assembly, the outer beam upper limit device (7) is inserted into the limiting hole opened in the steel fixing strip (12) in the form of a pin, and the outer beam lower limit device (8) is fixed to the opening position corresponding to the top surface of the fixed beam (11) by bolts; the outer beam upper limit device (7) and the outer beam lower limit device (8) cooperate with each other to constrain the position of the outer steel beam (5) in the radial and circumferential horizontal directions of the tower (14).

6. The device for rounding back the pit defect in a wind turbine steel tower according to claim 1, characterized in that, It also includes two deformation limiting plates (1), which are welded to the outer steel beam (5) on the side near the outer wall of the tower (14). The distance between the two deformation limiting plates (1) is equal to the distance of the outer edge of the pit extending outward by one wall thickness of the tower (14). The welding end of the deformation limiting plate (1) is set as a rectangular structure, and its contact end with the tower (14) is an arc surface with the same curvature as the outer wall of the tower (14). The radius of the arc surface is the same as the radius of the tower (14), and its circumferential coverage is three times the arc length of the pit.

7. The device for rounding back the pit defect in a wind turbine steel tower according to claim 1, characterized in that, The end fixing plate (3) is a rectangular steel plate, which is welded and fixed to the inner steel beam (6) on the side facing the pit defect; the end fixing plate (3) serves as the mounting base of the jacking actuator, and its plane is perpendicular to the axis of the tower (14).

8. The device for rounding back the pit defect in a wind turbine steel tower according to claim 1, characterized in that, The top extension end (2) is placed on the end fixing plate (3), and its axis is aligned with the center of the recess in the tower (14). The front end of the top extension end (2) is an arc surface, and the radius of curvature of the arc surface is consistent with the inner wall of the tower (14).

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