A device for removing broken anchor bolts for wind turbine foundation

Abstract

The present invention relates to the technical field of wind turbine foundation, and in particular to a device for removing a broken anchor bolt for a wind turbine foundation. The device for removing a broken anchor bolt for a wind turbine foundation comprises a removal rod and a tensioning rope, wherein the lower end of the removal rod is provided with an insertion hole for inserting the broken end of the lower section of the broken anchor bolt, and the hole wall of the insertion hole is provided with at least one notch and at least one pair of rope-threading holes, and each pair of rope-threading holes is respectively located on both sides of the corresponding notch in the circumferential direction of the removal rod, and at least one pair of rope-threading holes is provided for the tensioning rope to pass through, and both ends of the tensioning rope are located at the upper end of the removal rod, and the upper end of the removal rod is provided with a fixing structure for fixing the end of the tensioning rope; before the broken end of the lower section of the broken anchor bolt is inserted into the insertion hole, the tensioning rope between at least one pair of rope-threading holes is in a relaxed state and is located above the notch, and after the broken end of the lower section of the broken anchor bolt is inserted into the insertion hole, the tensioning rope is pulled, and the tensioning rope between at least one pair of rope-threading holes is in a tensioned state and enters between two adjacent screw teeth of the lower section of the broken anchor bolt through the notch.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine foundations, and in particular to a device for removing broken anchor bolts used in wind turbine foundations. Background Art

[0002] The wind turbine foundation is an important part of wind power equipment. It is composed of anchor bolts, anchor plates and matching parts, and is cast with concrete. It is mainly used to fix wind turbines. The anchor bolts are the main load-bearing components of the wind turbine foundation. Since the wind turbine tower and wind power generation components are erected at an altitude of 80 to 150 meters, the operating conditions are harsh, so the anchor bolts are subjected to 360° alternating loads. In addition, due to problems with anchor bolt production quality, violent construction or excessive anchor bolt tension, the anchor bolts may break during use. In order to ensure the normal operation of the wind turbine foundation, it is necessary to disassemble and remove the broken anchor bolts to replace them.

[0003] The anchor bolt length in the prior art is 4-6m, and the diameter is 30-60mm. The anchor bolt hole diameter of the wind turbine foundation is slightly larger than the anchor bolt diameter. The anchor bolt fracture occurs mostly in the threaded part of the anchor bolt. If the fracture occurs in the upper thread, the fracture is shallow, and the broken anchor bolt is relatively simple to dismantle and remove. If the fracture occurs in the lower thread, the anchor bolt hole is narrow and slender. After the lower section of the broken anchor bolt is completely unscrewed from the lower anchor plate, it is difficult to remove the lower section of the broken anchor bolt from the anchor bolt hole. Summary of the invention

[0004] The object of the present invention is to provide a broken anchor bolt removal device for a wind turbine foundation, so as to solve the technical problem in the prior art that it is difficult to remove the lower section of the broken anchor bolt from the anchor bolt hole.

[0005] To achieve the above-mentioned purpose, the technical solution of the broken anchor bolt removal device for the wind turbine foundation of the present invention is:

[0006] A broken anchor bolt removal device for a wind turbine foundation comprises a removal rod and a tensioning rope, wherein the lower end of the removal rod is provided with an insertion hole for inserting the broken end of the lower section of the broken anchor bolt, and the hole wall of the insertion hole is provided with at least one notch and at least one pair of rope threading holes, and each pair of rope threading holes is respectively located on both sides of the corresponding notch in the circumferential direction of the removal rod, and at least one pair of rope threading holes is used for the tensioning rope to pass through, and both ends of the tensioning rope are located at the upper end of the removal rod, and the upper end of the removal rod is provided with a fixing structure for fixing the end of the tensioning rope; before the broken end of the lower section of the broken anchor bolt is inserted into the insertion hole, the tensioning rope between at least one pair of rope threading holes is in a relaxed state and is located above the notch, and after the broken end of the lower section of the broken anchor bolt is inserted into the insertion hole, the tensioning rope is pulled, and the tensioning rope between at least one pair of rope threading holes is in a tensioned state and enters through the notch into between two adjacent screw teeth of the lower section of the broken anchor bolt.

[0007] The beneficial effect is as follows: the present invention sets a pair of rope threading holes on the extraction rod, and passes a tensioning rope through the rope threading holes. Before the extraction rod is inserted into the anchor hole, that is, before the fracture of the lower section of the broken anchor is inserted into the insertion hole, the tensioning rope between the pair of rope threading holes is in a relaxed state and is above the notch; after the extraction rod is inserted into the anchor hole, that is, after the fracture of the lower section of the broken anchor is inserted into the insertion hole, the tensioning rope is pulled, so that the tensioning rope between the pair of rope threading holes is in a tensioned state and enters between two adjacent screw teeth of the lower section of the broken anchor through the notch. Afterwards, the extraction rod is taken out along the anchor hole, and under the action of the tensioning rope, the lower section of the broken anchor can be taken out along with the extraction rod, and the operation is relatively simple.

[0008] As a further improvement, the fixing structure is a fixing column.

[0009] The beneficial effect is that such a design facilitates the fixing of the two ends of the tensioning rope.

[0010] As a further improvement, before the broken end of the lower section of the broken anchor bolt is inserted into the insertion hole, one end of the tensioning rope is fixed to the fixing column, and the other end of the tensioning rope is a free end.

[0011] The beneficial effect is that, with this design, after the broken end of the lower section of the broken anchor bolt is inserted into the insertion hole, the tensioning rope can be tensioned by simply pulling the free end, which is relatively convenient to operate.

[0012] As a further improvement, at least two fixing columns are provided.

[0013] The beneficial effect is that with such a design, the two ends of the tension rope can be respectively wound around the two fixing columns.

[0014] As a further improvement, the fixing column is arranged on the outer peripheral surface of the taking-out rod.

[0015] The beneficial effect is that: such a design enables the fixing column and the rope threading hole to be arranged correspondingly, which is beneficial to the tensioning of the tensioning rope.

[0016] As a further improvement, a notch and a pair of rope threading holes are provided on the hole wall of the insertion hole, and the pair of rope threading holes are respectively arranged on both sides of the radial direction of the removal rod.

[0017] The beneficial effect is that such a design makes the length of the tensioning rope entering between the screw teeth longer after being tensioned, thereby ensuring the stability of removing the lower section of the broken anchor bolt.

[0018] As a further improvement, both ends of the tensioning rope are respectively passed through the outer sides of the corresponding rope passing holes.

[0019] The beneficial effect is that such a design is conducive to pulling and tightening the tensioning ropes in a loose state between the paired rope threading holes.

[0020] As a further improvement, the notch is an inclined notch that slopes from top to bottom and inward.

[0021] The beneficial effect is that such a design facilitates the lower end of the removal rod to enter the annulus surrounded by the lower section of the broken anchor bolt and the hole wall of the anchor bolt hole.

[0022] As a further improvement, the tension rope is a nylon rope.

[0023] The beneficial effect is that the nylon rope is softer and is convenient for tensioning when the end is pulled.

[0024] As a further improvement, the removal rod is a hollow rod.

[0025] The beneficial effect is that such a design can reduce the weight of the taking-out rod, which is convenient for an operator to hold the taking-out rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a broken anchor bolt removal device for a wind turbine foundation according to the present invention;

[0027] Figure 2 It is a structural schematic diagram of the lower section of the broken anchor bolt being taken out after being screwed out from the lower anchor plate;

[0028] Figure 3 for Figure 1 A schematic diagram of the structure of a broken anchor bolt removal device for a medium-sized wind turbine foundation inserted into an anchor bolt hole;

[0029] Figure 4 for Figure 3 A partial enlarged view of .

[0030] In the figure: 11, removal rod; 12, tensioning rope; 13, notch; 14, fixing column; 15, anchor hole; 16, lower section of broken anchor; 17, lower anchor plate; 18, rope hole; 19, upper anchor plate; 20, tower flange. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0033] It should be noted that the terms that may appear, such as "first" and "second", etc., are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." etc. do not exclude the existence of other identical elements in the process, method, article or device including the elements. In addition, the terms "front", "back", "up", "down", "left" and "right" are based on the orientation and positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention, rather than indicating that the device or component referred to must have a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0034] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0035] Embodiment 1 of the device for removing broken anchor bolts for wind turbine foundation of the present invention:

[0036] like Figures 1 to 4 As shown, the broken anchor bolt removal device for the wind turbine foundation includes a removal rod 11 and a tensioning rope 12. The lower end of the removal rod 11 is provided with a socket for inserting the broken end of the broken anchor lower section 16. A notch 13 and a pair of rope threading holes 18 are provided on the hole wall of the socket. The pair of rope threading holes 18 are respectively located on both sides of the notch 13 in the circumferential direction of the removal rod 11.

[0037] In this embodiment, the tensioning rope 12 passes through the above-mentioned paired rope holes 18, and both ends of the tensioning rope 12 are located at the upper end of the removal rod 11. The upper end of the removal rod 11 is provided with a fixing column 14 for fixing the end of the tensioning rope 12, and the fixing column 14 constitutes a fixing structure.

[0038] like Figure 1 and Figure 3 As shown, the paired rope holes 18 are symmetrically arranged on both sides of the extraction rod 11; two fixing columns 14 are provided and symmetrically arranged on the outer peripheral surface of the extraction rod 11, that is, the rope holes 18 are arranged correspondingly to the fixing columns 14. Before the broken end of the broken anchor lower section 16 is inserted into the insertion hole, one end of the tension rope 12 is fixed to one of the fixing columns 14, and the other end of the tension rope 12 is a free end.

[0039] In this embodiment, the notch 13 is an inclined notch which is inclined from top to bottom and inward. In this embodiment, the two ends of the tension rope 12 pass through the outer side of the rope threading hole 18. In other embodiments, the notch can be a rectangular notch.

[0040] In this embodiment, the tension rope 12 is a high-strength nylon rope. Since the nylon rope is easily deformed, the nylon rope between the paired rope holes needs to be glued and fixed when it is in a loose state. In other embodiments, the nylon rope between the paired rope holes can be pulled by an auxiliary nylon rope, and after the fracture of the lower section of the broken anchor bolt is inserted into the insertion hole of the removal rod, one end of the auxiliary nylon rope is loosened and the other end of the auxiliary nylon rope is pulled to remove the auxiliary nylon rope.

[0041] In this embodiment, the extraction rod 11 is a hollow rod, the outer diameter of the extraction rod 11 is smaller than the diameter of the anchor hole 15, and the inner diameter of the extraction rod 11 is larger than the diameter of the broken anchor lower section 16. The tube wall at the lower end of the extraction rod 11 is thinner, so that the extraction rod 11 can enter the annulus formed by the broken anchor lower section 16 and the wall of the anchor hole 15. In other embodiments, the extraction rod can be a solid rod, in which case the insertion hole at the lower end of the extraction rod is a blind hole.

[0042] It should be noted that if the hole diameter on the upper anchor plate 19 and the tower flange 20 is greater than or equal to the outer diameter of the extraction rod 11, there is no need to enlarge the holes on the upper anchor plate 19 and the tower flange 20; if the hole diameter on the upper anchor plate 19 and the tower flange 20 is smaller than the outer diameter of the extraction rod 11, it is necessary to enlarge the holes on the upper anchor plate 19 and the tower flange 20 to ensure that the extraction rod 11 can be inserted into the anchor hole 15.

[0043] like Figure 2 As shown, when the broken anchor lower section 16 needs to be taken out from the anchor hole 15 after being screwed out from the lower anchor plate 17, the tension rope 12 is first passed through the paired rope holes 18 at the notch 13 of the taking-out rod 11, and then the portion of the tension rope 12 between the paired rope holes 18 is dragged upward to the top of the notch 13 and fixed with glue. At this time, the portion of the tension rope 12 between the paired rope holes 18 is in a relaxed state; then, one end of the tension rope 12 is fixed to one of the fixing columns 14, and the other end of the tension rope 12 is a free end; then, The removal rod 11 is inserted into the anchor hole 15, so that the broken end of the lower section 16 of the broken anchor enters the insertion hole of the removal rod 11, and the free end of the tensioning rope 12 is pulled until the tensioning rope 12 located in the paired rope holes 18 is tensioned and enters between two adjacent screw teeth of the lower section 16 of the broken anchor, the tensioning rope 12 is kept in a tensioned state, and the free end of the tensioning rope 12 is fixed to another fixing column 14; finally, the removal rod 11 is taken out along the anchor hole 15, and under the action of the tensioning rope 12, the lower section 16 of the broken anchor can be taken out along with the removal rod 11.

[0044] Embodiment 2 of the device for removing broken anchor bolts for wind turbine foundation of the present invention:

[0045] The difference between this embodiment and embodiment 1 is that in embodiment 1, the fixing structure is a fixing column arranged on the outer peripheral surface of the removal rod. In this embodiment, the fixing structure is a fixing annular groove arranged on the outer peripheral surface of the removal rod.

[0046] Embodiment 3 of the device for removing broken anchor bolts for wind turbine foundation of the present invention:

[0047] The difference between this embodiment and embodiment 1 is that in embodiment 1, before the broken end of the lower section of the broken anchor bolt is inserted into the insertion hole, one end of the tension rope is fixed to the fixing column, and the other end of the tension rope is a free end. In this embodiment, before the broken end of the lower section of the broken anchor bolt is inserted into the insertion hole, both ends of the tension rope are free ends.

[0048] Embodiment 4 of the device for removing broken anchor bolts for wind turbine foundation of the present invention:

[0049] The difference between this embodiment and embodiment 1 is that in embodiment 1, two fixing posts are provided. In this embodiment, one fixing post is provided, and both ends of the tension rope are fixed to the fixing post.

[0050] Embodiment 5 of the device for removing broken anchor bolts for wind turbine foundation of the present invention:

[0051] The difference between this embodiment and embodiment 1 is that in embodiment 1, the fixing column is arranged on the outer peripheral surface of the taking-out rod. In this embodiment, the fixing column is arranged on the upper end surface of the taking-out rod.

[0052] Embodiment 6 of the device for removing broken anchor bolts for wind turbine foundation of the present invention:

[0053] The difference between this embodiment and embodiment 1 is that in embodiment 1, a notch and a pair of rope threading holes are provided on the hole wall of the insertion hole, and the pair of rope threading holes are respectively arranged on both sides of the radial direction of the removal rod. In this embodiment, two notches and two pairs of rope threading holes are provided on the hole wall of the insertion hole, and the two notches are symmetrically arranged on the hole wall of the insertion hole, the two pairs of rope threading holes are located between the two notches, and each notch corresponds to a pair of rope threading holes.

[0054] Embodiment 7 of the device for removing broken anchor bolts for wind turbine foundation of the present invention:

[0055] The difference between this embodiment and embodiment 1 is that in embodiment 1, the two ends of the tension rope are respectively passed through the outer sides of the corresponding rope passing holes. In this embodiment, the two ends of the tension rope are passed through the inner sides of the rope passing holes.

[0056] Embodiment 8 of the device for removing broken anchor bolts for wind turbine foundation of the present invention:

[0057] The difference between this embodiment and embodiment 1 is that in embodiment 1, the tensioning rope can be a nylon rope. In this embodiment, the tensioning rope is a steel wire rope, which is not easy to deform, and the steel wire rope between the paired rope holes does not need to be glued and fixed when it is in a relaxed state.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A device for removing broken anchor bolts for wind turbine foundations, characterized in that: The invention comprises a take-out rod (11) and a tension rope (12). The lower end of the take-out rod (11) is provided with an insertion hole for inserting the broken end of the lower section (16) of the broken anchor bolt. The hole wall of the insertion hole is provided with at least one notch (13) and at least one pair of rope threading holes (18). Each pair of rope threading holes (18) is located on both sides of the corresponding notch (13) in the circumferential direction of the take-out rod (11). At least one pair of rope threading holes (18) is used for the tension rope (12) to pass through. Both ends of the tension rope (12) are located at the upper end of the take-out rod (11). The take-out rod (11) 1) is provided with a fixing structure for fixing the end of a tension rope (12); before the broken end of the lower section (16) of the broken anchor bolt is inserted into the insertion hole, the tension rope (12) between at least one pair of rope threading holes (18) is in a relaxed state and is located above the notch (13); after the broken end of the lower section (16) of the broken anchor bolt is inserted into the insertion hole, the tension rope (12) is pulled, and the tension rope (12) between at least one pair of rope threading holes (18) is in a tensioned state and enters through the notch (13) between two adjacent screw threads of the lower section (16) of the broken anchor bolt.

2. The broken anchor bolt removal device for wind turbine foundation according to claim 1, characterized in that: The fixing structure is a fixing column (14).

3. The broken anchor bolt removal device for wind turbine foundation according to claim 2, characterized in that: Before the broken end of the broken anchor lower section (16) is inserted into the insertion hole, one end of the tension rope (12) is fixed on the fixing column (14), and the other end of the tension rope (12) is a free end.

4. The broken anchor bolt removal device for wind turbine foundation according to claim 2 or 3, characterized in that: At least two fixing columns (14) are provided.

5. The broken anchor bolt removal device for wind turbine foundation according to claim 2 or 3, characterized in that: The fixing column (14) is arranged on the outer peripheral surface of the removal rod (11).

6. The broken anchor bolt removal device for wind turbine foundation according to claim 1, 2 or 3, characterized in that: A notch (13) and a pair of rope-threading holes (18) are provided on the wall of the insertion hole, and the pair of rope-threading holes (18) are respectively arranged on two radial sides of the removal rod (11).

7. The broken anchor bolt removal device for wind turbine foundation according to claim 1, 2 or 3, characterized in that: The two ends of the tension rope (12) are respectively passed through the outer sides of the corresponding rope passing holes (18).

8. The broken anchor bolt removal device for wind turbine foundation according to claim 1, 2 or 3, characterized in that: The notch (13) is an inclined notch (13) which is inclined from top to bottom and inward.

9. The broken anchor bolt removal device for wind turbine foundation according to claim 1, 2 or 3, characterized in that: The tension rope (12) is a nylon rope.

10. The broken anchor bolt removal device for wind turbine foundation according to claim 1, 2 or 3, characterized in that: The removal rod (11) is a hollow rod.

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