A device for removing broken anchor bolts for wind turbine foundations

Abstract

This invention relates to the field of wind turbine foundation technology, specifically to a device for removing broken anchor bolts for wind turbine foundations. The device includes a removal rod and an elastic pressure structure. The removal rod comprises a force transmission section, a turning section, and a removal head. The removal head is located at the lower end of the force transmission section and has a pressing surface for pressing against the cross-section of the lower section of the broken anchor bolt. The turning section is located at the upper end of the force transmission section and has a turning part for a turning tool to turn and drive the removal rod to rotate. The elastic pressure structure is connected to the upper end of the turning section to apply pressure to the removal rod. This invention applies pressure to the removal rod through the elastic pressure structure, ensuring sufficient friction between the pressing surface of the removal head and the cross-section of the broken surface. Then, by applying a removal torque to the turning section of the removal rod through a turning tool, the lower section of the broken anchor bolt can be driven to rotate through the removal rod, thus achieving the removal of the lower section of the broken anchor bolt and improving the removal efficiency of the broken anchor bolt.

Description

Technical Field

[0001] This invention relates to the field of wind turbine foundation technology, and more specifically to a device for removing broken anchor bolts for wind turbine foundations. Background Technology

[0002] Wind turbine foundations are a crucial component of wind power equipment. They consist of an anchor cage (comprising anchor bolts, anchor plates, and other accessories) cast in concrete and are primarily used to secure the wind turbine generator set. Anchor bolts are the main load-bearing components of the wind turbine foundation. Because the wind turbine tower and wind turbine components are erected at heights of 80–150 meters, operating under harsh conditions, the anchor bolts are subjected to alternating loads in a 360° direction. Combined with issues such as poor anchor bolt manufacturing quality, rough construction, or excessively high anchor bolt tension, anchor bolts may break during normal use. To ensure the normal operation of the wind turbine foundation, broken anchor bolts need to be replaced.

[0003] Chinese invention patent application CN105155571B discloses a method for replacing a prestressed anchor bolt assembly, which includes the following steps: First, pull out the upper section of the broken anchor bolt, then use a self-tapping drill bit to drill into the fracture section of the broken anchor bolt. While the self-tapping drill bit is drilling in, it drives the lower section of the broken anchor bolt to rotate, so that the lower section of the broken anchor bolt automatically exits the lower nut. Then, the self-tapping drill bit and the lower section of the broken anchor bolt are taken out of the anchor bolt hole together.

[0004] The above technical solution requires a high degree of flatness in the fracture section of the anchor bolt, ensuring that the borehole axis is approximately coincident with the axis of the lower section of the broken anchor bolt. If the anchor bolt undergoes necking fracture or the fracture section is inclined, it is difficult to drill a hole in the fracture section. If the borehole is located at the edge of the fracture section, and there is a large eccentricity between the borehole axis and the axis of the lower section of the broken anchor bolt, it is difficult to disassemble the lower section of the broken anchor bolt by applying torque to the borehole. Summary of the Invention

[0005] The purpose of this invention is to provide a device for dismantling broken anchor bolts for wind turbine foundations, so as to solve the technical problem that the existing anchor bolt replacement methods have high requirements for the flatness of the broken section of the anchor bolt.

[0006] To achieve the above objectives, the technical solution of the wind turbine foundation broken anchor bolt dismantling device of the present invention is as follows:

[0007] A device for removing broken anchor bolts for wind turbine foundations includes a removal rod and an elastic pressure structure. The removal rod includes a force transmission rod section, a screwing rod section, and a removal head. The removal head is located at the lower end of the force transmission rod section and has a pressing surface for pressing against the cross-section of the lower section of the broken anchor bolt. The screwing rod section is located at the upper end of the force transmission rod section and has a screwing part for a screwing tool to screw and drive the removal rod to rotate. The elastic pressure structure is connected to the upper end of the screwing rod section to apply pressure to the removal rod.

[0008] The beneficial effects are as follows: The wind turbine foundation fracture anchor bolt dismantling device of this invention has low requirements for the flatness of the anchor bolt fracture section. Pressure is applied to the dismantling rod through an elastic pressure structure, ensuring sufficient friction between the top pressure surface of the dismantling head and the fracture surface. Then, a dismantling torque is applied to the twisting section of the dismantling rod using a screwing tool, which drives the lower section of the fracture anchor bolt to rotate, thus achieving the dismantling of the lower section of the fracture anchor bolt. This process takes less time and improves the dismantling efficiency of the fracture anchor bolt.

[0009] As a further improvement, the elastic pressure structure includes a sleeve, a compression spring inside the sleeve, and a pressure rod connected inside the sleeve. The upper end of the screwing rod is slidably assembled inside the sleeve, the upper end of the compression spring presses against the pressure rod, and the lower end of the compression spring presses against the screwing rod.

[0010] As a further improvement, the sleeve is provided with a fixing plate for fixing to the side anchor bolt.

[0011] The beneficial effect is that this design ensures the sleeve is fixed without having to press it down by hand, thus saving manpower.

[0012] As a further improvement, the pressure rod is threaded onto the sleeve.

[0013] The beneficial effect is that this design allows the pressure applied to the disassembly rod to be adjusted by turning the pressure rod, and the pressure rod can remain in that position after adjustment.

[0014] As a further improvement, the disassembly head is detachably connected to the lower end of the force transmission rod segment.

[0015] The beneficial effect is that this design allows for adaptation to different fracture surfaces by replacing different disassembly heads.

[0016] As a further improvement, the disassembly head is provided with an insertion hole adapted to the break of the lower section of the broken anchor bolt. The insertion hole has a conical surface or an inclined surface, which constitutes the top pressure surface.

[0017] The beneficial effect is that this design allows the disassembly device to adapt to necked or tilted fracture surfaces.

[0018] As a further improvement, the pressing surface is provided with a pressing blade or a pressing protrusion.

[0019] The beneficial effect is that by setting a top pressure blade on the top pressure surface, sufficient friction is provided during the disassembly of the lower section of the broken anchor bolt.

[0020] As a further improvement, the force transmission segment is a telescopic segment.

[0021] The beneficial effect is that this design allows the length of the force transmission rod segment to be adjusted to accommodate anchor bolts at different fracture locations.

[0022] As a further improvement, the disassembly head is a magnetic head or the top pressing surface of the disassembly head is provided with a magnet.

[0023] The beneficial effect is that this design allows the disassembly head to pick up the lower section of the broken anchor bolt. That is, after the disassembly rod has completely unscrewed the lower section of the broken anchor bolt from the lower anchor plate, the lower section of the broken anchor bolt can be pulled out by simply lifting the disassembly rod, thus improving work efficiency.

[0024] As a further improvement, the screwing part has a prism structure.

[0025] The beneficial effect is that it makes it easy to disassemble the rod by turning it with a wrench. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the broken anchor bolt removal device for wind turbine foundation of the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of the disassembly rod;

[0028] Figure 3 for Figure 1 A schematic diagram of the structure of the broken anchor bolt removal device for wind turbine foundations in use;

[0029] Figure 4 for Figure 3 The left view;

[0030] Figure 5 for Figure 1 A schematic diagram of the structure before the disassembly head and the fracture surface are fitted together;

[0031] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention before the disassembly head and the fracture surface are pressed together;

[0032] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention before the disassembly head and the fracture surface are pressed together.

[0033] In the diagram: 11. Force transmission rod segment; 12. Tightening rod segment; 13. Disassembly head; 14. Tightening part; 15. Fixing elongated hole; 16. Sleeve; 17. Compression spring; 18. Compression rod; 19. Fixing plate; 20. Lower section of broken anchor bolt; 21. Insertion hole; 22. Top pressure blade; 23. Tightening tool; 24. Anchor bolt hole; 25. Upper anchor plate; 26. Tower flange. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "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 a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Additionally, the terms "front," "rear," "upper," "lower," "left," and "right" are based on the orientation and positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention, not to indicate that the referred device or component must have a specific orientation, and therefore should not be construed as limiting the invention.

[0037] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0038] Embodiment 1 of the broken anchor bolt removal device for wind turbine foundation of the present invention:

[0039] like Figures 1 to 5As shown, the device for removing broken anchor bolts for wind turbine foundations includes a removal rod and an elastic pressure structure. The maximum outer diameter of the removal rod is smaller than the diameter of the anchor bolt hole 24, so that the removal rod can be inserted into the anchor bolt hole 24. The removal rod includes a force transmission rod section 11, a screwing rod section 12, and a removal head 13. The removal head 13 is located at the lower end of the force transmission rod section 11 and has a pressing surface for pressing against the cross-section of the lower section 20 of the broken anchor bolt. The screwing rod section 12 is located at the upper end of the force transmission rod section 11 and has a screwing part 14. The screwing part 14 is screwed by a screwing tool 23 to drive the removal rod to rotate, thereby removing the lower section 20 of the broken anchor bolt. The screwing tool 23 is a wrench.

[0040] It should be noted that if the diameter of the holes on the upper anchor plate 25 and the tower flange 26 is greater than or equal to the maximum outer diameter of the disassembly rod, then it is not necessary to enlarge the holes on the upper anchor plate 25 and the tower flange 26; if the diameter of the holes on the upper anchor plate 25 and the tower flange 26 is less than the maximum outer diameter of the disassembly rod, then it is necessary to enlarge the holes on the upper anchor plate 25 and the tower flange 26 to ensure that the disassembly rod can be inserted into the anchor bolt hole 24.

[0041] like Figure 2 As shown, the disassembly head 13 is detachably connected to the lower end of the force transmission rod section 11, and the tightening rod section 12 is detachably connected to the upper end of the force transmission rod section 11. Preferably, the disassembly head 13 and the tightening rod section 12 are threadedly connected to the lower and upper ends of the force transmission rod section 11, respectively, wherein the tightening direction of the disassembly head 13 and the tightening rod section 12 is the same as the loosening direction of the lower section 20 of the broken anchor bolt.

[0042] In this embodiment, the force transmission rod segment 11 is a telescopic rod segment so that the length of the force transmission rod segment 11 can be adjusted, ensuring that after the disassembly rod is inserted into the anchor bolt hole 24, the screwing rod segment 12 can still protrude outside the anchor bolt hole 24.

[0043] In this embodiment, the disassembly head 13 is a magnetic head. This design allows the disassembly head 13 to attract the lower section 20 of the broken anchor bolt. That is, after the disassembly rod has completely unscrewed the lower section 20 of the broken anchor bolt, the lower section 20 of the broken anchor bolt can be brought out by simply lifting the disassembly rod, thus improving work efficiency.

[0044] In this embodiment, the screwing part 14 is a square prism structure. In other embodiments, the screwing part can be a hexagonal prism structure.

[0045] like Figure 5As shown, the disassembly head 13 is provided with an insertion hole 21. The insertion hole 21 has a tapered surface adapted to the necked fracture of the lower section 20 of the broken anchor bolt, and the tapered surface constitutes the aforementioned pressure surface. The pressure surface is provided with a pressure blade 22, which can provide sufficient friction during the disassembly of the lower section 20 of the broken anchor bolt to drive the lower section 20 of the broken anchor bolt to rotate, thereby achieving the disassembly of the lower section 20 of the broken anchor bolt. In other embodiments, the pressure blade can be replaced by a pressure protrusion.

[0046] like Figure 3 and Figure 4 As shown, an elastic pressure structure is connected to the upper end of the screwing rod section 12 to apply pressure to the disassembly rod. The elastic pressure structure includes a sleeve 16, a compression spring 17 located within the sleeve 16, and a pressure rod 18 connected within the sleeve 16 via an upper spring seat. The upper end of the screwing rod section 12 is slidably fitted into the sleeve 16 via a lower spring seat. The upper end of the compression spring 17 presses against the upper spring seat, and the lower end of the compression spring 17 presses against the lower spring seat. That is, the pressure rod 18 and the screwing rod section 12 are located on the upper and lower sides of the compression spring 17, respectively.

[0047] like Figure 1 and Figure 3 As shown, the sleeve 16 is provided with a fixing plate 19 for fixing to the side anchor bolt. This design ensures that the sleeve 16 is fixed without pressing it by hand, saving manpower. The fixing plate 19 is provided with a fixing elongated hole 15 to accommodate anchor bolts with different spacing.

[0048] In this embodiment, the pressure rod 18 is threaded onto the sleeve 16. This design allows the pressure applied to the disassembly rod to be adjusted by turning the pressure rod 18, and the pressure rod 18 can remain in that position after adjustment.

[0049] During disassembly, remove the upper section of the broken anchor bolt, select a suitable disassembly head 13 and force transmission rod section 11, and assemble them with the screwing rod section 12 to form a disassembly rod. Insert the disassembly rod into the anchor bolt hole 24 and insert the broken end of the lower section 20 of the broken anchor bolt into the insertion hole 21 of the disassembly head 13. At this time, a part of the screwing rod section 12 is exposed in the anchor bolt hole 24. Connect the elastic pressure structure to the screwing rod section 12 and fix the elastic pressure structure to the adjacent anchor bolt head. Adjust the downward pressure of the disassembly rod by screwing the pressure rod 18 downward to ensure that the top pressure surface of the disassembly head 13 and the cross section of the broken end have a sufficiently large disassembly torque. Then, apply the disassembly torque to the disassembly rod by the screwing tool 23, which can drive the lower section 20 of the broken anchor bolt to rotate, thereby realizing the disassembly of the lower section 20 of the broken anchor bolt. After the lower section 20 of the broken anchor bolt is completely screwed out from the lower anchor plate, remove the elastic pressure structure, lift the disassembly rod, and use the magnetic attraction of the disassembly head to remove the lower section 20 of the broken anchor bolt from the anchor bolt hole 24.

[0050] Embodiment 2 of the present invention: a device for removing broken anchor bolts for wind turbine foundations.

[0051] The difference between this embodiment and Embodiment 1 is that, in Embodiment 1, the disassembly head 13 is provided with an insertion hole 21, and the insertion hole 21 has a conical surface adapted to the necked fracture of the lower section 20 of the broken anchor bolt, the conical surface forming a top-pressure surface. In this embodiment, as... Figure 6 As shown, the disassembly head 13 is provided with a socket 21. The socket 21 has an inclined surface that matches the necked fracture surface of the lower section 20 of the broken anchor bolt. The inclined surface forms a pressing surface. At this time, the cross-section of the lower section 20 of the broken anchor bolt is an inclined fracture surface. After the pressing surface and the inclined fracture surface press against each other, they can form a limit in the twisting direction, so as to effectively transfer the disassembly torque to the lower section of the broken anchor bolt and realize the disassembly of the lower section of the broken anchor bolt. It should be noted that the disassembly head 13 has various models depending on the angle of the inclined fracture surface.

[0052] Embodiment 3 of the present invention: a device for removing broken anchor bolts for wind turbine foundations.

[0053] The difference between this embodiment and Embodiment 1 is that, in Embodiment 1, the disassembly head 13 is provided with an insertion hole 21, and the insertion hole 21 has a conical surface adapted to the necked fracture of the lower section 20 of the broken anchor bolt, the conical surface forming a top-pressure surface. In this embodiment, as... Figure 7 As shown, the disassembly head 13 does not have an insertion hole, and the lower plane of the disassembly head 13 forms a pressure surface. At this time, the cross-section of the lower section 20 of the broken anchor bolt is a flat fracture surface. In order to generate sufficient friction, a pressure blade can be provided on the lower plane of the disassembly head 13.

[0054] Embodiment 4 of the present invention: a device for removing broken anchor bolts for wind turbine foundations.

[0055] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the elastic pressure structure includes a sleeve, a compression spring inside the sleeve, and a pressure rod connected inside the sleeve. In this embodiment, the elastic pressure structure includes a compression spring and a pressure plate. The upper end of the compression spring is positioned and presses against the pressure plate, and the lower end of the compression spring is positioned and presses against the upper end of the screwing rod section. At this time, a person or a telescopic cylinder needs to keep pressing the pressure plate to provide sufficient pressure.

[0056] Embodiment 5 of the present invention: a device for removing broken anchor bolts for wind turbine foundations.

[0057] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the sleeve is provided with a fixing plate for fixing to the side anchor bolt. In this embodiment, the sleeve is not provided with a fixing plate, but is pressed onto the upper anchor plate by hand or telescopic cylinder. At this time, the lower part of the sleeve is provided with a space for inserting and turning a wrench.

[0058] Embodiment 6 of the present invention: a device for removing broken anchor bolts for wind turbine foundations.

[0059] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the pressure rod is threaded onto the sleeve. In this embodiment, the pressure rod is slidably mounted on the sleeve, requiring a person or telescopic cylinder to continuously press down on the pressure rod to provide sufficient top pressure.

[0060] Embodiment 7 of the present invention: a device for removing broken anchor bolts for wind turbine foundations.

[0061] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the force transmission segment is a telescopic segment. In this embodiment, the force transmission segment is non-telescopic. In this case, a series of force transmission segments can be set up, and the length of the disassembly rod can be adjusted by replacing force transmission segments of different lengths.

[0062] Embodiment 8 of the present invention: a device for removing broken anchor bolts for wind turbine foundations.

[0063] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the disassembly head is a magnetic head. In this embodiment, a magnet is provided on the top pressing surface of the disassembly head. To prevent the magnet from being crushed, the height of the top pressing blade protruding from the top pressing surface is greater than the height of the magnet protruding from the top pressing surface.

[0064] Embodiment 9 of the present invention: a device for removing broken anchor bolts for wind turbine foundations.

[0065] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the screwing part is a quadrangular prism structure. In this embodiment, the screwing part is a screwing hole, that is, the disassembly rod is driven to rotate by inserting a screwing rod into the screwing hole.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A device for removing broken anchor bolts for wind turbine foundations, characterized in that, The device includes a disassembly rod and an elastic pressure structure. The disassembly rod comprises a force transmission rod segment (11), a screwing rod segment (12), and a disassembly head (13). The disassembly head (13) is located at the lower end of the force transmission rod segment (11) and has a pressing surface for pressing against the cross-section of the lower section (20) of the broken anchor bolt. The screwing rod segment (12) is located at the upper end of the force transmission rod segment (11) and has a screwing part (14) for a screwing tool (23) to screw and drive the disassembly rod to rotate. The elastic pressure structure is connected to the upper end of the screwing rod segment (12) to... Pressure is applied to the disassembly rod to ensure that the top pressure surface of the disassembly head and the cross section of the fracture have sufficient friction; the elastic pressure structure includes a sleeve (16), a compression spring (17) inside the sleeve (16), and a pressure rod (18) connected inside the sleeve (16). The upper end of the screwing rod section (12) is slidably assembled inside the sleeve (16), the upper end of the compression spring (17) presses against the pressure rod (18), and the lower end of the compression spring (17) presses against the screwing rod section (12); the sleeve (16) is provided with a fixing plate (19) for fixing to the side anchor bolt.

2. The device for removing broken anchor bolts for wind turbine foundations according to claim 1, characterized in that, The pressure rod is threaded onto the sleeve (16) along its pressing direction against the pressure spring.

3. The device for removing broken anchor bolts for wind turbine foundations according to claim 1 or 2, characterized in that, The disassembly head (13) is detachably connected to the lower end of the force transmission rod segment (11).

4. The device for removing broken anchor bolts for wind turbine foundations according to claim 1 or 2, characterized in that, The disassembly head (13) is provided with a socket (21) adapted to the break of the lower section (20) of the broken anchor bolt. The socket (21) has a conical surface or a slope, which constitutes the top pressure surface.

5. The device for removing broken anchor bolts for wind turbine foundations according to claim 1 or 2, characterized in that, The top pressing surface is provided with a top pressing blade (22) or a top pressing protrusion.

6. The device for removing broken anchor bolts for wind turbine foundations according to claim 1 or 2, characterized in that, The force transmission rod segment (11) is a telescopic rod segment so that the length of the force transmission rod segment can be adjusted, ensuring that after the disassembly rod is inserted into the anchor bolt hole, there is still a screwing rod segment that can be exposed outside the anchor bolt hole.

7. The device for removing broken anchor bolts for wind turbine foundations according to claim 1 or 2, characterized in that, The disassembly head (13) is a magnetic head or the top pressing surface of the disassembly head (13) is provided with a magnet.

8. The device for removing broken anchor bolts for wind turbine foundations according to claim 1 or 2, characterized in that, The screwing part (14) has a prism structure.

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