A friction-type constant resistance anchor bolt with recyclable constant resistance device

Abstract

This utility model discloses a friction-type constant resistance anchor bolt with a recyclable constant resistance device, including an anchor bolt body with a constant resistance device body sleeved on its outer side. The constant resistance device body has a raised inner wall and a smooth inner wall from top to bottom. A small tray and a flat tray are both set on the outer side of the constant resistance device body, with the flat tray located above the small tray. A friction sleeve is sleeved on the outer side of the anchor bolt body and located below the constant resistance device body. A fastening unit is screwed to the outer side of the anchor bolt body and located below the friction sleeve. The fastening unit has a fastening unit baffle. Under the action of the anchor bolt drilling machine, the fastening unit moves along the top of the anchor bolt body and pushes the friction sleeve to move into the constant resistance device body to cooperate with the raised inner wall and the smooth inner wall. The pre-tightening force can be applied simply by driving the fastening unit through the anchor bolt drilling machine. Furthermore, since the constant resistance device body is sleeved between the anchor bolt body and the anchor bolt body, it can play a supporting role while making full use of the constant resistance device body, which is in line with the concept of sustainable development.

Description

Technical Field

[0001] This utility model belongs to the field of mine support technology, specifically relating to a friction-type constant resistance anchor bolt with a recyclable constant resistance device. Background Technology

[0002] In the field of mine roadway support, constant resistance large deformation anchor bolts play an irreplaceable role as a key support component. They can maintain stable anchoring force even when the rock mass undergoes large deformation, effectively preventing rock mass instability, collapse and other disasters, and providing a solid guarantee for the safe construction and long-term stable operation of the project.

[0003] However, the tail of traditional constant resistance large deformation anchor bolts is usually designed as a conical platform. There is a sliding phenomenon between the conical platform and the constant resistance device. When it is necessary to apply pre-tightening force to the anchor bolt to ensure that it fits tightly with the rock mass and effectively plays the anchoring role, this sliding makes it difficult to accurately and stably transmit and maintain the pre-tightening force, so that the pre-tightening operation cannot achieve the expected effect.

[0004] To achieve pre-tightening, traditional methods have to rely on complex pile structures. During construction, a specialized pile system needs to be built, and a series of tedious operations and precise adjustments are required before pre-tightening force can be applied to the anchor bolts. This not only increases the difficulty and workload of construction but also places higher demands on the professional skills and experience of construction personnel. Moreover, the complex pile system occupies a large amount of construction space, prolongs the construction period, increases construction costs, and also increases safety risks during construction.

[0005] Furthermore, in traditional designs, the constant resistance device and the anchor rod are connected as an inseparable whole. After the anchor rod completes its anchoring task, it is difficult to remove it from the rock mass because the anchor rod is tightly integrated with the rock mass. As the constant resistance device is part of the anchor rod, it cannot be disassembled either. This means that in actual engineering applications, the constant resistance device that accompanies each used constant resistance large deformation anchor rod can only be treated as a disposable consumable. This undoubtedly increases the material cost and overall cost of the project. At the same time, the waste of a large number of disposable constant resistance devices also results in a waste of resources.

[0006] In summary, traditional constant-resistance large-deformation anchor bolts have serious shortcomings in terms of pre-tightening and the reuse of constant-resistance devices, which do not conform to the concept of sustainable development. Utility Model Content

[0007] The purpose of this utility model is to provide a friction-type constant resistance anchor bolt with a recyclable constant resistance device, so as to solve the technical defects of the existing technology, which has serious deficiencies in the pre-tightening and reusability of the constant resistance device in traditional constant resistance large deformation anchor bolts.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A friction-type constant-resistance anchor bolt with a recyclable constant-resistance device, comprising: An anchor bolt body, with a constant resistance body sleeved on its outer side, the constant resistance body having a raised inner wall and a smooth inner wall from top to bottom; Both the small tray and the flat tray are located on the outside of the constant resistor body, with the flat tray positioned above the small tray. The friction sleeve is fitted onto the outside of the anchor rod body and is located below the constant resistance device body; The fastening unit is screwed to the outside of the anchor rod body and located below the friction sleeve. The fastening unit is provided with a fastening unit baffle. Under the action of the anchor drilling machine, the fastening unit moves along the top of the anchor body and pushes the friction sleeve to move into the constant resistance body to cooperate with the protruding inner wall and the smooth inner wall.

[0009] Furthermore, the protruding inner wall is located in the upper and middle parts of the constant resistor body, and the smooth inner wall is located in the bottom part of the constant resistor body; The friction sleeve has a tapered end; wherein, when the friction sleeve is pushed and moved into the constant resistor body by the fastening unit, the tapered end contacts the portion of the protruding inner wall located in the middle of the constant resistor body.

[0010] Furthermore, the raised inner wall is formed by alternating arrangement of the first and second protrusions, and the smooth inner wall is formed by sequential arrangement of the third protrusions; The height of the first protrusion is greater than the height of the second protrusion, and the height of the third protrusion is equal to the height of the second protrusion.

[0011] Furthermore, the bottom of the anchor bolt body is provided with a threaded section, which is located below the constant resistance body; The fastening unit is screwed onto the threaded section.

[0012] Furthermore, the outer diameter of the fastening unit is equal to the outer diameter of the friction sleeve.

[0013] Furthermore, the fastening unit baffle is disposed at the bottom of the fastening unit.

[0014] Furthermore, the fastening unit baffle is welded to the fastening unit.

[0015] Furthermore, the fastening unit baffle has an annular structure, and its outer diameter is equal to the outer diameter of the fastening unit.

[0016] Furthermore, the small tray is welded to the friction sleeve.

[0017] Furthermore, the inner diameter of the friction sleeve is larger than the outer diameter of the anchor bolt body.

[0018] Compared with the prior art, the present invention has the following beneficial effects: During use, when pre-tightening force needs to be applied to the anchor body and the rock mass, the anchor drilling rig simply drives the fastening unit to compress the rock mass with the flat tray, thereby applying pre-tightening force to both the anchor body and the anchor body. Secondly, since the constant resistance device body is sleeved between the anchor body and the anchor body, and the constant resistance device body has both raised and smooth inner walls, it can ensure that it supports the rock mass while also allowing the constant resistance device body to be disassembled and fully utilized after the support operation is completed. This not only reduces support costs but also conforms to the concept of sustainable development. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figures 1-4 This is an existing technical solution; Figure 5 A schematic diagram of a friction-type constant resistance anchor rod for a recyclable constant resistance device provided by this utility model; Figure 6 A schematic diagram of the fastening unit installation in a friction-type constant resistance anchor rod of a recyclable constant resistance device provided by this utility model; Figure 7 A schematic diagram of the fastening unit operation in a friction-type constant resistance anchor rod of a recyclable constant resistance device provided by this utility model; The components are as follows: 1. Rod body; 2. Drill hole; 3. Resin anchoring agent solidified solid; 4. Constant resistance device; 5. Wedge body; 6. Tray; 7. Nut; 8. Constant resistance device drill hole; 9. Baffle plate; 10. Adapter; 11. Pre-tightening opening; 12. Jack; 13. Pre-tightening wrench; 14. Tensioning pile; 15. Anchor cable; 20. Anchor rod body; 21. Anchor rod drill hole; 22. Resin anchoring agent solidified solid; 23. Gap; 24. Mounting hole; 25. Constant resistance device body; 26. Protruding inner wall; 27. Smooth inner wall; 28. Small tray; 29. ​​Flat tray; 30. Friction sleeve; 31. Threaded section; 32. Fastening unit; 33. Fastening unit baffle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] 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 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 present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the 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, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] like Figures 1-4As shown, the existing technology mainly utilizes the friction between the constant resistance 4 and the wedge-shaped body 5 at the tail of the rod 1 to achieve the sliding extension of the rod 1 under a large pressure. Its structure is as follows. Figure 1 As shown, the main implementation methods are as follows: First, a 30mm rock drill bit is used to drill hole 2. Then, a 60mm diameter reaming drill bit is used to enlarge the lower 500mm section of hole 2 into a 60mm diameter constant resistance drill hole 8. Next, tray 6 is placed inside constant resistance 4. Then, resin cartridge is first inserted into hole 2, and the top of rod 1, which is already fitted with tray 6, constant resistance 4 and nut 7, is used to push the resin cartridge into the top of hole 2. Next, the rock bolt drilling machine is used to rotate the nut 7 at the tail of constant resistance 4. Nut 7 then drives constant resistance 4 to rotate, and constant resistance 4 drives rod 1 to rotate. The top of rod 1 rotates inside the resin cartridge, causing the resin cartridge to solidify and form a solid resin anchoring agent 3. The top of rod 1 is fixed in the deep stable surrounding rock by the bonding effect of the solid resin anchoring agent 3.

[0028] Among them, nut 7 is a nut with a baffle plate 9 at the bottom, with an upper opening and a lower closing. Relying on the supporting effect of the baffle plate 9, when the rod body 1 is turned on and stirred, nut 7 will not rotate and rise along the outer thread of constant resistor 4.

[0029] Then, the torque of the anchor drilling rig is increased, causing the baffle 9 to be worn through. The nut 7 then rotates and rises along the constant resistance 4, pressing the tray 6 upwards to press tightly against the surrounding rock wall. When the torque is further increased and the nut 7 is rotated, slippage occurs between the constant resistance 4 and the wedge 5 at the tail of the rod 1 due to the annular contact between the wedge 5 at the tail of the rod 1 and the inside of the constant resistance 4. Figure 2 As shown, the nut 7 cannot move further upward. If the nut 7 cannot move upward, it cannot further compress the tray 6. Consequently, the tray 6 cannot compress the surrounding rock, and ultimately the tray cannot exert a pre-stressing effect on the surrounding rock, so the rod 1 cannot directly exert a pre-stressing effect on the surrounding rock.

[0030] To address the issue of the inability to implement prestressing, traditional constant resistance rods require complex tooling structures after installation, such as... Figure 3As shown, the anchor cable 15 at the tail of the pile structure is tensioned by jack 12. At the same time, the pile structure squeezes the tray 6, and the tray 6 squeezes the surrounding rock. Simultaneously, the anchor cable 15 drives the constant resistance device 4 to tighten, and the constant resistance device 4 drives the anchor rod 1 to tighten. Then, at the tooling opening 11, the nut 7 is rotated forward by the pre-tightening wrench 13, so that the nut 7 locks the displacement of the tray 6 squeezing the surrounding rock forward. The rod 1 and the constant resistance device 4 are in a tensioned state and squeeze the nut 7. The nut 7 squeezes the tray 6, and then the tray 6 squeezes the surrounding rock, thereby realizing the prestressing effect on the surrounding rock. Then, the jack 12, the tensioned pile 14, and the internal auxiliary anchor cable 15 and converter 10 are removed.

[0031] use Figure 1 The traditional constant-resistance large-deformation anchor bolt structure achieves the large deformation extension of the rod body 1 mainly by relying on the surrounding rock to compress the tray 6, the tray 6 to compress the nut 7, and the nut 7 to drive the constant resistance device 4 to move downward. When the constant resistance device 4 moves downward, it encounters the resistance of the wedge-shaped body 5 at the tail of the rod body 1. The wedge-shaped body 5 overcomes the friction provided by the concave and convex textures inside the constant resistance device 4 to achieve a constant resistance value. However, the following problems exist: First, in terms of the overall structure, the wedge-shaped body 5 is designed as a whole with the rod body 1, and the length of the rod body 1 is less than the overall length of the constant-resistance anchor bolt. Second, the nut 7 is installed on the constant resistance device 4 instead of at the tail of the anchor bolt rod body 1. Secondly, since the nut 7 is installed on the constant resistance device 4, and the constant resistance device 4 and the rod body 1 only rely on the circumferential linear contact between the wedge-shaped body 5, the nut 7 on the constant resistance device 4 is prone to slipping when rotating, and cannot be moved upward by rotating the nut 7. If it cannot be moved upward, it cannot compress the tray 6, and the tray 6 cannot compress the surrounding rock. It is difficult to pre-tighten it by the traditional anchor drilling machine. It is necessary to replace the nut 7 with a special pile after the baffle 9 is worn off and the mixing is completed. Since the tensioning is a high-pressure construction process, it is also necessary to rely on manual use of wrench 13 to tighten the nut, which poses a great safety hazard. The safety operation procedure requires that when using jack 12 to tension the anchor cable, the personnel must be at least 2 meters away from jack 12. This violates the safety operation procedure requirement. Therefore, the construction risk is extremely high and it is very easy to cause a safety accident.

[0032] Finally, the constant resistance 4 has a large diameter and heavy weight, and is made of high-quality steel, which requires a large amount of expensive steel, resulting in high support costs and poor economic efficiency, which is not conducive to the achievement of the cost reduction and efficiency improvement goals promoted by the coal mining industry.

[0033] To address the technical deficiencies mentioned above, this embodiment provides a friction-type constant-resistance anchor bolt with a recyclable constant-resistance device. The present invention will be further described in detail below with reference to the accompanying drawings: like Figures 5-7As shown, a friction-type constant resistance anchor bolt with a recyclable constant resistance device includes an anchor bolt body 20, a constant resistance device body 25 sleeved on the outside of the anchor bolt body 20, and a raised inner wall 26 and a smooth inner wall 27 arranged from top to bottom in the constant resistance device body 25; a small tray 28 and a flat tray 29, both disposed on the outside of the constant resistance device body 25, with the flat tray 29 located above the small tray 28; a friction sleeve 30 sleeved on the outside of the anchor bolt body 20 and located below the constant resistance device body 25; and a fastening unit 32 screwed to the outside of the anchor bolt body 20 and located below the friction sleeve 30, with a fastening unit baffle 33 on the fastening unit 32; wherein, under the action of the anchor bolt drilling machine, the fastening unit 32 moves along the top of the anchor bolt body 20 and pushes the friction sleeve 30 to move into the constant resistance device body 25 to cooperate with the raised inner wall 26 and the smooth inner wall 27.

[0034] During use, when it is necessary to apply pre-tightening force to the anchor body 20 and the rock mass, the anchor drilling rig can drive the fastening unit 32 to make the flat tray 29 squeeze the rock mass, thereby achieving pre-tightening of the rock mass and the anchor body 20. Secondly, since the constant resistance device body 25 is sleeved between the anchor body 20 and the anchor body 20, and the constant resistance device body 25 has a raised inner wall 26 and a smooth inner wall 27, it can ensure that it plays a supporting role for the rock mass. At the same time, after the support operation is completed, the constant resistance device body 25 can be disassembled and fully utilized, which not only reduces the support cost, but also conforms to the concept of sustainable development.

[0035] Furthermore, as can be seen from the figure, the raised inner wall 26 is located in the upper and middle parts of the constant resistor body 25, and the smooth inner wall 27 is located in the bottom of the constant resistor body 25; the friction sleeve 30 has a tapered end; wherein, when the friction sleeve 30 is pushed and moved into the constant resistor body 25 by the fastening unit 32, the tapered end contacts the part of the raised inner wall 26 located in the middle of the constant resistor body 25, thereby generating frictional resistance, thereby ensuring that the fastening unit 32 cannot enter the constant resistor 25.

[0036] Furthermore, the raised inner wall 26 is formed by alternating arrangement of the first and second protrusions, and the smooth inner wall 27 is formed by sequential arrangement of the third protrusions; wherein, the height of the first protrusion is greater than the height of the second protrusion, and the height of the third protrusion is equal to the height of the second protrusion.

[0037] In this design, the bottom of the anchor bolt body 20 is provided with a threaded section 31, which is located below the constant resistance body 25, and the fastening unit 32 is screwed onto the threaded section 31.

[0038] In this implementation, the outer diameter of the fastening unit 32 is equal to the outer diameter of the friction sleeve 30. When the fastening unit 32 is driven, it can fully push the friction sleeve 30 so that the friction sleeve 30 can be displaced on the anchor body 20.

[0039] In this implementation, the fastening unit baffle 33 is located at the bottom of the fastening unit 32 and can work in conjunction with the drive end of the anchor drilling rig to smoothly push the fastening unit 32.

[0040] In this implementation, the fastening unit baffle 33 and the fastening unit 32 are welded together, and the fastening unit 32 is a fastening nut.

[0041] In this implementation, the fastening unit baffle 33 is a ring structure, and its outer diameter is equal to that of the fastening unit 32.

[0042] In this implementation, the small pallet 28 is welded to the friction sleeve 30.

[0043] In this implementation, the inner diameter of the friction sleeve 30 is larger than the outer diameter of the anchor rod body 20, allowing it to move smoothly within the constant resistance body 25.

[0044] When the friction-type constant resistance anchor bolt with recyclable constant resistance device of this scheme is installed in the surrounding rock of the roadway, firstly, a 30mm rock drill bit is used to drill the anchor bolt hole 21, and then a 50mm diameter reaming drill bit is used to enlarge the lower 300mm section of the anchor bolt hole 21 into a constant resistance device installation hole with a diameter of 50mm.

[0045] Next, the flat tray 29, friction sleeve 30, and constant resistance device 25 are sequentially fitted into the anchor body 20. The resin anchoring agent is pushed into the top of the anchor drill hole 21 by the top of the anchor body 20. Then, the anchor drilling machine is used to rotate the fastening unit baffle 33 at the bottom of the anchor body 20 so that the fastening unit 32 rotates. The fastening unit 32 drives the top of the anchor body 20 to be inserted into the resin anchoring agent and rotates and stirs the resin cartridge, so that the resin cartridge solidifies to form the resin anchor solid 22.

[0046] Then, the torque of the anchor drilling rig is increased, and the front end of the anchor drilling rig continues to rotate. After the fastening unit baffle 33 is gradually rubbed through, the fastening unit baffle 33 no longer prevents the fastening unit 32 from moving upward. The fastening unit 32 then rotates and moves upward along the threaded section 31 at the bottom of the anchor body 20. As the fastening unit 32 gradually moves upward, it gradually squeezes the friction sleeve 30 upward. The conical end of the friction sleeve 30 moves upward and squeezes the protruding inner wall 26. The protruding inner wall 26 then drives the constant resistance device body 25 to move upward. The constant resistance device body 25 moves upward and drives the flat tray 29 to move upward and squeeze the surrounding rock wall, generating prestress on the surrounding rock wall, thereby achieving the application of pre-tightening force to the anchor body 20.

[0047] Then, after removing the anchor drilling rig and installing the anchor body 20, as the surrounding rock of the tunnel moves into the tunnel space, the surrounding rock wall will squeeze the flat tray 29 and drive the small tray 28 at the bottom of the constant resistance body 25. The small tray 28 drives the constant resistance body 25 to move downward. When the constant resistance body 25 slides downward as a whole, the protruding inner wall 26 will rub against the conical end of the friction sleeve 30 and generate frictional resistance. This frictional resistance provides constant resistance for the constant resistance body 25.

[0048] Meanwhile, as the protruding inner wall 26 is continuously overcome, the constant resistance body 25 slides downward along the anchor rod body 20, realizing the sliding of the constant resistance body 25 and the extension deformation of the anchor rod body 20. At the same time, the fastening unit 32 does not enter the constant resistance body 25, keeping the fastening unit 32 exposed.

[0049] After the tunnel is completed and before it is scrapped, the fastening unit 32 is removed using a conventional anchor removal device. Then, the constant resistance body 25, which contains the friction sleeve 30 that has slipped, is removed in sequence. Next, a new anchor bolt hole 21 is drilled, and the constant resistance body 25 containing the friction sleeve 30 is reinstalled. If the slippage is insufficient, a short friction sleeve 30 is added between the friction sleeve 30 and the fastening unit 32.

[0050] Among them, the friction sleeve 30 adopts different lengths. By increasing the number of friction sleeves 30, the secondary recovery of the sliding amount of the constant resistor body 25 can be achieved. Increasing the number of friction sleeves 30 can also increase the sliding amount of the constant resistor body 25, so as to achieve the function of not reducing the extension of the constant resistor body 25 when reused.

[0051] In summary, this solution solves the problem that traditional technology cannot achieve pre-tightening due to the slippage between the conical platform at the tail of the anchor rod and the constant resistance device 4. It also eliminates the construction step of relying on complex piles to achieve pre-tightening, simplifying the construction process. Furthermore, it solves the technical defect of traditional technology where the constant resistance device 4 is connected to the rod body 1 as a whole, and the rod body 1 cannot be removed due to anchoring, which in turn makes it impossible to remove the constant resistance device 4 connected to the rod body 1.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit its protection scope. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this utility model, they can still make various changes, modifications or equivalent substitutions to the specific implementation of the utility model, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the utility model.

Claims

1. A friction-type constant-resistance anchor bolt with a recyclable constant-resistance device, characterized in that, include: An anchor bolt body, with a constant resistance body sleeved on its outer side, the constant resistance body having a raised inner wall and a smooth inner wall from top to bottom; Both the small tray and the flat tray are located on the outside of the constant resistor body, with the flat tray positioned above the small tray. The friction sleeve is fitted onto the outside of the anchor rod body and is located below the constant resistance device body; The fastening unit is screwed to the outside of the anchor rod body and located below the friction sleeve. The fastening unit is provided with a fastening unit baffle. Under the action of the anchor drilling machine, the fastening unit moves along the top of the anchor body and pushes the friction sleeve to move into the constant resistance body to cooperate with the protruding inner wall and the smooth inner wall.

2. The friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 1, characterized in that, The protruding inner wall is located in the upper and middle parts of the constant resistor body, and the smooth inner wall is located in the bottom part of the constant resistor body. The friction sleeve has a tapered end; wherein, when the friction sleeve is pushed and moved into the constant resistor body by the fastening unit, the tapered end contacts the portion of the protruding inner wall located in the middle of the constant resistor body.

3. The friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 2, characterized in that, The raised inner wall is formed by alternating arrangement of the first and second protrusions, and the smooth inner wall is formed by sequential arrangement of the third protrusions. The height of the first protrusion is greater than the height of the second protrusion, and the height of the third protrusion is equal to the height of the second protrusion.

4. The friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 1, characterized in that, The bottom of the anchor bolt body is provided with a threaded section, which is located below the constant resistance body; The fastening unit is screwed onto the threaded section.

5. A friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 1, characterized in that, The outer diameter of the fastening unit is equal to the outer diameter of the friction sleeve.

6. A friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 1, characterized in that, The fastening unit baffle is located at the bottom of the fastening unit.

7. A friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 6, characterized in that, The fastening unit baffle is welded to the fastening unit.

8. A friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 7, characterized in that, The fastening unit baffle has a ring-shaped structure, and its outer diameter is equal to the outer diameter of the fastening unit.

9. A friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 1, characterized in that, The small tray is welded to the friction sleeve.

10. A friction-type constant-resistance anchor bolt with a recyclable constant-resistance device according to claim 1, characterized in that, The inner diameter of the friction sleeve is larger than the outer diameter of the anchor bolt body.

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