Recyclable anchor rod and method of recycling the same

Abstract

The present application relates to a recyclable anchor rod and a recycling method thereof, wherein the recyclable anchor rod comprises an anchor rod, a free section anchor rod and an anchoring section anchor rod connected to each other by a recycling device; the recycling device comprises a shell, the top of the shell is provided with an annular hole for connecting and allowing the free section anchor rod to move, the bottom of the shell is provided with a threaded hole for connecting the anchoring section anchor rod, wherein the recycling device is provided with an annular tooth and a force receiving platform matched with the shape of the annular tooth, and the force receiving platform is configured to be able to engage with the annular tooth with the tension displacement of the anchor rod, wherein when the anchor rod is in a tension state, the free section anchor rod is driven to rotate in a first direction, the free section anchor rod rotates and drives the recycling device to generate a first torque in the first direction, the anchoring section anchor rod generates a second torque in a second direction opposite to the first torque, so that the free section anchor rod is separated from the anchoring section anchor rod under the action of the first torque and the second torque in opposite directions.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering support structure technology, to drilling technology in soil or rock, and particularly to a recyclable anchor bolt and its recycling method. Background Technology

[0002] With the continuous advancement of urbanization in my country, the theory and technology of surrounding rock control in deep underground engineering are of paramount importance to ensuring the safe and efficient construction and production of underground engineering projects. The most effective way to control the surrounding rock is to apply anchor bolts to the boreholes. Therefore, anchor bolts play a decisive role in ensuring the safety of underground engineering construction.

[0003] Anchor bolts are support components made of high tensile strength materials and installed inside the surrounding rock. They are mainly used for the support of open slopes, underground caverns, tunnels, and building foundation pits. Traditional anchor bolts, as temporary support structures, are usually buried underground along with the building structure after their function fails. This occupies a large amount of underground space, forms underground waste, causes underground environmental pollution, and the leftover anchor bolts become underground obstacles for subsequent projects. In addition, the inability to effectively recycle anchor bolts leads to the waste of steel.

[0004] Besides being time-consuming and labor-intensive to remove, conventional anchor bolts also have difficulty in determining whether their anchoring quality meets design standards. Therefore, recyclable anchor bolts are an inevitable product of the development of anchor bolt technology. Currently, some recyclable anchor bolt technologies have emerged on the market, which typically include pull-out recyclable anchor bolts, thermoplastic recyclable anchor bolts, and mechanical recyclable anchor bolts.

[0005] Typically, only the anchor bars are recovered, not the entire anchor rod. The anchor rod components, such as the consolidation body and pressure-bearing components, remain underground. Recyclable anchor rods emphasize self-dismantling and recovery, that is, the anchor bars are automatically disassembled and detached by a recovery unit (such as a self-unlocking anchor or a bearing body) set on the anchor bars in advance, without the use of forced removal methods such as drilling rigs. "The key to the technology of recyclable anchor rods in foundation pits lies in the pressure-bearing component. The pressure-bearing component is a pressure-bearing component (recovery unit) located at the bottom end of the anchor bar of the pressure type anchor rod (and the unit anchor rod of the pressure-dispersing anchor rod), which bears the tension of the anchor bar and transmits it to the consolidation body in the form of pressure."

[0006] Mechanically recyclable anchor bolts are pressure anchor bolts that utilize the principle of expansion shells. The anchor head has one or two wedge-shaped bodies. As the bolt is inserted, the anchor head gradually expands, applying a certain force to the rock mass. The shell and the rock mass generate friction to form an anchoring force.

[0007] CN102605780B discloses a recyclable anchor rod for foundation pit support. The recyclable anchor rod for foundation pit support includes a precast concrete component and a round steel anchor rod. The precast concrete component has a hollow metal threaded sleeve inside. The front end of the round steel anchor rod has an external thread and is screwed to the precast concrete component through the metal threaded sleeve. The tail end of the round steel anchor rod has a locking thread. The round steel anchor rod includes at least two steel rods, which are connected by a nut. The helix direction of the nut is opposite to the helix direction of the thread at the front end of the round steel anchor rod.

[0008] CN109723060A discloses a manually operated mechanical recyclable anchor rod and its recycling method. Specifically, it includes a reinforcing bar, a bearing body, and a rubber sealing ring. A plastic sleeve has a plastic sleeve connection port inside, and the reinforcing bar is installed inside the plastic sleeve connection port. The reinforcing bar is connected to a conical lock by threaded engagement, and the conical lock is connected to the lock release sleeve by a flat-head screw. The conical lock is bonded to the rubber sealing ring on one side. Grip reinforcement ribs are installed on both sides of the bearing body, and the bearing body is located above the plastic sleeve. A lock circumferential locator is installed inside the bearing body, and the conical lock is installed inside the lock circumferential locator.

[0009] Currently available mechanically recyclable anchor bolts suffer from complex structures and low recycling efficiency. Furthermore, during the recycling process, the anchor cable bundle may continuously stretch and tighten, potentially leading to a decrease in anchoring force. These types of anchor bolts typically lack monitoring and reinforcement structures to monitor anchoring force during recycling. Therefore, a recyclable intelligent anchor bolt is needed to monitor the stress on the anchor bolt, thereby monitoring the quality of the anchoring project. Simultaneously, it should be able to recycle and remove the free section of the anchor bolt, thus reducing construction costs, accelerating construction progress, and conserving resources.

[0010] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making this invention, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that the present invention does not possess the features of these prior art. On the contrary, the present invention already possesses all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Summary of the Invention

[0011] In view of the shortcomings of the prior art, the present invention provides a recyclable anchor bolt and a recycling method thereof, aiming to solve at least one or more technical problems existing in the prior art.

[0012] To achieve the above objectives, the present invention provides a recyclable anchor bolt, comprising:

[0013] Anchor bolts include free-section anchor bolts and anchored-section anchor bolts;

[0014] The recovery device has a top and bottom that are movably connected to the free section anchor bolt and the anchored section anchor bolt, respectively.

[0015] in,

[0016] The recovery device contains annular teeth and a support platform that moves with the tension of the anchor bolts to couple with the annular teeth.

[0017] When the anchor bolt is under tension, the free section of the anchor bolt is driven to rotate in a first direction, causing the recovery device to generate a first torque in the first direction. The anchored section of the anchor bolt, due to the rotation of the free section, generates a second torque opposite to the first torque, causing the free section to detach from the anchored section under the action of the opposing first and second torques. In this invention, when the anchor bolt needs to be recovered, the free section of the anchor bolt can be driven to rotate by an external force, causing the recovery device, which is engaged with the outside of the anchor bolt, to rotate with the free section and generate a torque. The anchored section of the anchor bolt, under the action of the surrounding rock and soil layer, generates a second torque opposite to that of the free section and / or the recovery device. Under the action of these two opposing torques, the free section and the anchored section gradually rotate and separate. In particular, the shell of the recovery unit has a simple connection and fixing structure, and high-precision machining is not required for this shell. Therefore, the design and manufacturing difficulty of this mechanical recovery unit is extremely low, and its corresponding material price and production cost are also very low. In addition, in this invention, the recovery unit is provided with an annular tooth and a bearing platform. As the tensioning device outside the borehole continuously tensions the anchor rod, the inclined tooth on the bearing platform will engage with the annular tooth based on the tension of the anchor rod. This engagement can prevent the radial sliding of the free section of the anchor rod, thereby preventing the force line outside the borehole from shifting and making the free section of the anchor rod easier to rotate.

[0018] Preferably, the bottom of the recovery device is provided with a threaded hole, and the anchoring section anchor rod is detachably connected to the recovery device through the threaded hole. The surface of the anchoring section anchor rod that meshes with the threaded hole is provided with at least one eccentric oil pipe channel.

[0019] Preferably, the recovery device is connected to at least one oil pipe that extends axially along the free section of the anchor rod and passes through the bearing platform to the micro-gap between the screw and the threaded hole, and the oil pipe is connected to at least one eccentric oil pipe channel through an inner oil pipe channel.

[0020] Preferably, before or during the free section anchor rod being tensioned and rotated along the first direction by drive, hydraulic oil is injected into the micro-gap between the screw rod and the threaded hole via an oil pipe to provide a static pressure torque to assist in the loosening of the screw rod from the threaded hole. In this invention, while rotating the free section anchor rod to separate it from the anchored section anchor rod, hydraulic oil is simultaneously injected into the screw rod via an external pressurization line. The injection of hydraulic oil provides lubrication for the relative movement and separation between the screw rod and the threaded hole of the recovery device, making the separation process between the screw rod and the recovery device smoother and easier, and facilitating the drive of the free section anchor rod by the external tensioning equipment.

[0021] Preferably, a sealing ring is provided at the contact point between the screw and the threaded hole, and an annular gasket that fits against the sealing ring is provided at the connection point between the anchor section and the recovery device. The sealing ring and the annular gasket prevent hydraulic oil leakage and allow hydraulic oil to accumulate at the bottom of the screw, thereby enabling the hydraulic oil to evenly fill all areas between the screw and the threaded hole to provide a uniform and sufficient static pressure torque.

[0022] Preferably, the system further includes a monitoring unit, which comprises a strain sensor and a controller that are signal-connected to each other. The strain sensor is used to monitor stress changes in the anchor bolt and acquire strain data; the controller is used to determine the anchoring state of the anchor bolt based on the strain data from the strain sensor. In this invention, a strain sensor for real-time monitoring of stress changes in the anchor bolt is installed on the anchor bolt or the free section of the anchor bolt. The strain sensor transmits the stress change data of the anchor bolt to the controller. The controller can determine the anchoring force change of the anchor bolt in real time based on the stress change data. During the recovery of the free section of the anchor bolt, the driving force of the tensioning equipment outside the borehole can be adjusted according to the real-time anchoring force change of the anchor bolt to maintain the continuity of anchor bolt recovery, while avoiding excessive pull-out force on the anchor bolt or even exceeding the tensile limit and causing failure, ultimately resulting in the recovered anchor bolt being unable to be effectively utilized.

[0023] Preferably, the system further includes a grouting unit, which comprises a grouting device and grouting channels that are interconnected. One or more grouting channels are located within the anchor bolt to provide a channel for conveying reinforcing grout. The grouting device is located at the borehole opening and is used to supply reinforcing grout to one or more grouting channels. In this invention, a grouting channel is pre-reserved inside the anchor bolt, and the grouting channel is connected to the grouting device outside the borehole opening. When the anchoring force of the anchor bolt is detected by a strain sensor to be less than a set threshold, reinforcing grout can be injected into the grouting channel through the grouting device to allow the reinforcing grout to enter the anchor bolt, especially the anchored section, thereby compensating for the insufficient anchoring force. Furthermore, the grouting volume can be adjusted according to changes in the actual anchoring force of the anchor bolt.

[0024] Preferably, the strain sensor uses the preset strain amplitude of the anchor bolt as a trigger event to record and transmit time-related stress change information of the anchor bolt. Specifically, the preset strain amplitude of the anchor bolt can be adjusted based on the time-related curve of the anchor bolt's anchoring force. Specifically, a time-related curve of the anchor bolt's anchoring force can be established, and the preset strain amplitude of the anchor bolt can be adjusted based on the trend of the anchoring force changing over time as represented by the curve. In this invention, when the rate of anchoring force decay of the anchor bolt slows down, the strain sensor can reduce the frequency and amount of data transmission, reducing the amount of data interaction and the latency generated during data transmission. This makes the controller's analysis and calculation of the anchor bolt's anchoring force more timely and smooth, especially enabling timely responses to changes in the anchor bolt's anchoring force, thereby allowing timely reinforcement of the anchor bolt's anchoring force through grouting.

[0025] Preferably, the sampling period of the strain sensor is the time consumed for each preset strain amplitude to be generated by the anchor bolt or for each preset strain amplitude to be reduced in the anchoring force of the anchor bolt. Alternatively, the sampling period of the strain sensor for the anchoring force of the anchor bolt is determined based on the time consumed for each preset strain amplitude to be generated by the anchor bolt. In particular, the ratio of the sampling period of the strain sensor to the preset strain amplitude is used to characterize the rate of stress change of the anchor bolt. In this invention, as the anchoring force of the anchor cable bundle continuously decreases, shortening the sampling period of the strain sensor allows the controller to analyze and determine the anchoring force of the anchor cable bundle more frequently and intensively, enabling timely detection of the attenuation state of the anchoring force of the anchor cable bundle and timely initiation of secondary grouting. Furthermore, the monitoring frequency of the strain sensor can be adjusted in a timely manner according to the changes in the anchoring force of the anchor cable bundle, making the monitoring frequency of the anchoring force of the anchor cable bundle more reasonable and accurate.

[0026] Preferably, the present invention also relates to a method for recycling recyclable anchor bolts, comprising:

[0027] The anchor bolt is kept in a tensioned state so that the annular teeth in the recovery device are coupled with the support platform.

[0028] The free section anchor bolt is driven to rotate in a first direction, causing the recovery device to generate a first torque in the first direction;

[0029] The anchor bolt in the anchoring section generates a second torque that is opposite to the first torque;

[0030] Under the action of the first and second torques, which are opposite to each other, the free section anchor bolt separates from the anchored section anchor bolt.

[0031] Preferably, the recycling method for the recyclable anchor bolt of the present invention may further include: injecting hydraulic oil into the oil pipe channel of the anchoring section anchor bolt using an external pressurization pipeline before or during the free section anchor bolt being in a tensioned state and being driven to rotate in a first direction, so that the hydraulic oil penetrates into the micro gap between the screw and the threaded hole to provide hydraulic torque to assist the anchoring section anchor bolt in loosening from the threaded hole.

[0032] The beneficial technical effects of this invention include: This invention provides a simple recyclable anchor bolt and its recycling device. While achieving easy recycling of the free section of the anchor bolt, the simple and lightweight structure of the anchor bolt recycling device results in low production costs, significantly reducing engineering costs and saving resources. Furthermore, the hydraulic-mechanical recycling device has a simple structural principle, does not require high-precision machining, and is convenient to use and maintain, making the anchor bolt recycling process extremely simple. In addition, the recyclable anchor bolt provided by this invention also has monitoring and grouting components. The monitoring module can reflect the anchoring force of the anchoring project in real time, facilitating the monitoring of construction quality. If the anchoring project quality does not meet the standards, secondary grouting can be performed through the grouting module to improve the anchoring force. Each module is independently designed, making disassembly and assembly simple, and repair and replacement rapid. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram of a recyclable anchor bolt according to a preferred embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of a recycling device according to a preferred embodiment of the present invention;

[0035] Figure 3 This is a top view of a preferred embodiment of the recycling device provided by the present invention, viewed along the axis of the annular hole;

[0036] Figure 4 Therefore Figure 2 A partial structural schematic diagram of the anchoring section of a recyclable anchor bolt is shown.

[0037] Figure 5 Therefore Figure 2 A partial structural schematic diagram of the screw of a recyclable anchor bolt is shown;

[0038] Figure 6 This is a schematic diagram of the installation structure of a quick connector according to a preferred embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the installation structure of the support platform and quick connector according to a preferred embodiment of the present invention;

[0040] Figure 8 This diagram illustrates the structure of the recyclable anchor bolt provided by the present invention when it engages with the ring tooth on the load-bearing platform.

[0041] Figure 9 This is a schematic diagram of hydraulic oil being injected into a threaded hole along an oil pipe according to a preferred embodiment of the present invention.

[0042] List of reference numerals

[0043] 1: Anchor bolt; 2: Recovery device; 3: Anchoring section; 4: Grouting channel; 5: Controller; 6: Grouting device; 7: Drill hole; 8: Signal transmission channel; 9: Strain sensor; 10: Pressurization pipeline; 11: Ring tooth; 12: Support platform; 13: Oil pipe channel; 14: Screw; 15: Threaded hole; 16: Sealing ring; 17: Ring gasket; 18a: Quick connector male plug; 18b: Quick connector female plug; 19: Oil pipe; 20: Inner oil pipe channel; 21: Micro-gap; 22: Recovery device mating thread; 23: Magnetic suction element; 101: Free section anchor bolt; 102: Anchoring section anchor bolt; 201: Upper shell; 202: Lower shell. Detailed Implementation

[0044] The following is a detailed explanation with reference to the accompanying drawings.

[0045] Example 1

[0046] See Figure 1 This invention provides a recyclable anchor bolt, which includes two parts: an anchor bolt 1 and a recycling device 2. The recycling device 2 is used to assist in the recycling of the anchor bolt 1. Specifically, the recycling device 2 is a hydraulic-mechanical recycling assembly. The recycling device 2 is connected to the anchor bolt 1 via a threaded connection and locking mechanism. The recycling device 2 is assembled to the anchor bolt 1 before it is lowered. Specifically, when the anchor bolt 1 needs to be recycled, the anchor bolt 1 is locked to the recycling device 2. The rotation of the anchor bolt 1 will drive the recycling device 2 to rotate, simultaneously opening the threads, thereby achieving the recycling of the anchor bolt 1.

[0047] According to a preferred embodiment, the recyclable anchor bolt (or anchor cable) may further include a monitoring unit for real-time monitoring of the anchoring force of the anchor bolt 1 and a grouting unit for secondary grouting to enhance or maintain the anchoring force of the anchor bolt 1.

[0048] According to a preferred embodiment, such as Figure 1 As shown, the monitoring unit may include a strain sensor 9 (e.g., a strain gauge), a signal transmission channel 8 (e.g., a signal transmission cable), and a controller 5. The strain sensor 9 is connected to the controller 5 via the signal transmission channel 8.

[0049] Specifically, strain sensor 9 can be deployed on the free section of anchor bolt 101. Furthermore, during the installation and retrieval of anchor bolt 1, strain sensor 9 can monitor stress changes in anchor bolt 1 in real time. The monitoring data from strain sensor 9 can be transmitted to controller 5 via signal transmission channel 8. Controller 5 can perform calculations and analyses on the stress monitoring data from strain sensor 9 to provide data support for evaluating the quality of anchoring projects. In particular, for example, in shallow geological environments where the anchoring area is relatively shallow, signal transmission between strain sensor 9 and controller 5 can also be achieved wirelessly.

[0050] According to a preferred embodiment, when the anchor bolt 1 is rotated based on an external force to at least retract the free section of the anchor bolt 101, the torque and pull-out force for rotating the free section of the anchor bolt 101 can be provided by driving a corresponding tensioning device. Furthermore, during the torsion and pull-out of the free section of the anchor bolt 101, the magnitude of the external force can be adjusted in real time based on the stress monitoring data from the strain sensor 9. Therefore, during the retraction of the free section of the anchor bolt 101, not only can the anchor bolt 1 be kept in a state of continuous tension, but excessive external force is also avoided, causing the anchor bolt 1 to exceed its tensile strength and fail.

[0051] According to a preferred embodiment, such as Figure 1 As shown, the grouting unit of the present invention may include a grouting channel 4 and a grouting device 6. Specifically, the grouting channel 4 may include one or more grouting pipes installed inside the anchor bolt 1. The one or more grouting pipes are connected to the grouting device 6 outside the borehole opening 7.

[0052] According to a preferred embodiment, during the recovery of anchor bolt 1, if the anchoring force of anchor bolt 1 is detected by the monitoring unit to be less than a set threshold, reinforcing grout can be injected into anchor bolt 1 using grouting device 6 and grouting channel 4, so as to improve or maintain the anchoring force of anchor bolt 1, especially the anchoring section 3 of anchor bolt 1, through secondary grouting.

[0053] According to a preferred embodiment, in this invention, the main body of the hydraulic-mechanical recycling device 2 can be constructed of a metal component. This metal component is primarily a cylindrical shell. For example... Figures 2 to 4 As shown, the cylindrical shell has an annular hole at the top, which can be used to lower and connect the free section anchor rod 101.

[0054] According to a preferred embodiment, the free section anchor 101 and the recovery device 2 can be integrally connected. Specifically, the free section anchor 101 is connected to the annular hole and coupled integrally with the recovery device 2. Alternatively, the free section anchor 101 can be detachably coupled to the recovery device 2 through the annular hole.

[0055] According to a preferred embodiment, such as Figure 2 As shown, the bottom of the annular hole or along its circumference is provided with annular teeth 11. Specifically, Figure 3 A top view of the annular tooth 11 is shown when viewed along the axis of the annular hole.

[0056] According to a preferred embodiment, a support platform 12 is provided below the annular tooth 11 to engage with it. Specifically, as shown... Figure 2 As shown, the side of the support platform 12 that contacts the ring tooth 11 has an inclined surface tooth adapted to the shape of the ring tooth 11. Furthermore, the support platform 12 is connected to the free section anchor rod 101 and can move up and down with the axial tensioning movement of the free section anchor rod 101, thereby enabling it to engage with the ring tooth 11 through the inclined surface tooth on its top surface.

[0057] According to a preferred embodiment, the recycling device 2 can be a split-type structure. Specifically, as shown in the example... Figure 2 As shown, the recycling device 2 can be formed by combining an upper housing 201 and a lower housing 202 through a recycling device and a thread 22.

[0058] According to a preferred embodiment, the internal structure of the housing of the recycling device 2 is hollow. An independent space exists below the annular teeth 11 of the recycling device 2. Specifically, during the manufacture of the recycling device 2, the support platform 12 can be pre-positioned in this independent space (e.g., within the lower housing 202) in a movable manner. Furthermore, the inclined teeth on the upper part of the support platform 12 can engage with the annular teeth 11 to provide a locking function, thereby preventing radial sliding of the free section anchor rod 101 connected to the support platform 12.

[0059] Specifically, when the free section anchor 101 is tensioned by an external force, the support platform 12 moves and rises until the inclined teeth at its top contact and mesh with the ring teeth 11. The engagement of the ring teeth 11 with the inclined teeth of the support platform 12 prevents radial slippage of the free section anchor 101. In particular, the angle of the inclined teeth of the support platform 12 can be half that of the ring teeth 11.

[0060] According to a preferred embodiment, such as Figure 2 As shown, a threaded hole 15 is located below the annular hole. Alternatively, the bottom of the recovery device 2 has a threaded hole 15. Specifically, the anchoring section anchor rod 102 is internally threaded into the threaded hole 15. Alternatively, the threaded hole 15 is connected to the screw 14 portion of the anchoring section anchor rod 102, see [reference needed]. Figure 2 and Figure 4 Specifically, the anchoring section 102 can be detachably connected to the threaded rod 14. Alternatively, the anchoring section 102 can be integrally formed with the threaded rod 14. More specifically, the threaded rod 14 can be part of the anchoring section 102. Alternatively, the anchoring section 102 can be mated with the threaded rod 14. Figure 5 A partial structural schematic diagram of the screw 14 is shown. In other words, the anchoring section 102 is detachably connected to the recycling device 2 via the screw 14.

[0061] According to a preferred embodiment of the present invention, when anchoring is performed using anchor bolt 1, the free section of anchor bolt 101 and the anchored section of anchor bolt 102 are connected as a whole by a retrieval device 2. Conversely, when retrieving anchor bolt 1, the free section of anchor bolt 101 and the anchored section of anchor bolt 102 are separated by the retrieval device 2.

[0062] According to a preferred embodiment, the annular hole at the top of the recycling device 2 and the threaded hole 15 below the annular hole are not connected to each other. Alternatively, in some alternative embodiments, the annular hole at the top of the recycling device 2 and the threaded hole 15 below the annular hole may be connected to each other.

[0063] According to a preferred embodiment, when the annular hole at the top of the recycling device 2 and the threaded hole 15 below the annular hole are not connected to each other, the free section anchor rod 101 can pass through the annular hole and extend to the bottom of the annular hole. Further, one end of the free section anchor rod 101 passing through the annular hole is connected to the support platform 12. Preferably, the support platform 12 can move up and down within the hollow structure of the recycling device 2.

[0064] According to a preferred embodiment, when the annular hole at the top of the recycling device 2 and the threaded hole 15 below the annular hole are in communication with each other, the free section anchor 101 passes through the annular hole and extends to the top of the threaded hole 15 located below the annular hole. At this time, the free section anchor 101 and the screw 14 can be threadedly connected. Alternatively, the free section anchor 101 and the screw 14 can be butt-jointed. Alternatively, the free section anchor 101 and the screw 14 are not connected to each other.

[0065] According to a preferred embodiment, when the anchor bolt 1 is tensioned, the annular teeth 11 in the recovery device 2 engage with the inclined teeth on the upper part of the support platform 12. Alternatively, the annular teeth 11 circumferentially around the annular hole engage with the inclined teeth on the upper part of the support platform 12. Specifically, when the free section of the anchor bolt 101 is tensioned, the support platform 12 moves upward, thereby causing the inclined teeth on the upper part of the support platform 12 to engage with the annular teeth 11 at the lower part of the annular hole.

[0066] According to a preferred embodiment, when retrieving the free section anchor bolt 101, the anchor bolt 1 is in a tensioned state, causing the bearing platform 12 to move upward and couple with the annular tooth 11. At this time, the retrieval device 2 is entirely engaged with the outside of the anchor bolt 1. Further, the anchor bolt 1 is driven to rotate by a power device outside the borehole 7, and the rotation of the free section anchor bolt 101 will drive the retrieval device 2 to rotate. For example, when the free section anchor bolt 101 is driven to rotate clockwise by an external force, the free section anchor bolt 101 will drive the retrieval device 2 to rotate clockwise.

[0067] According to a preferred embodiment, as the free section anchor bolt 101 rotates, it drives the recovery device 2 to rotate, thereby providing the recovery device 2 with a first torque (e.g., Figure 2 (As shown in T1). At this time, the threaded hole 15 at the bottom of the recovery device 2 has the same first torque. On the other hand, while the free section anchor 101 rotates, the screw 14 will generate a second torque (as shown in T2) that is opposite to the first torque.

[0068] According to a preferred embodiment, the first torque generated by the rotation of the free section anchor 101 and / or the rotation of the retrieval device 2 comes from the torque generated by the external force tightening the anchor 1. Alternatively, the first torque generated by the rotation of the free section anchor 101 and / or the retrieval device 2 comes from the rotation of the external force. During this process, due to the tensioning of the anchor 1, the support platform 12 moves upward and engages with the ring tooth 11, which acts as a lock and prevents the free section anchor 101 connected to the support platform 12 from radially sliding. In particular, when the retrieval device 2 is secured to the free section anchor 101 through the engagement of the support platform 12 and the ring tooth 11, the retrieval device 2 can rotate with the rotation of the free section anchor 101.

[0069] According to a preferred embodiment, the second torque generated by the anchoring section anchor 102 and / or screw 14 due to the rotation of the free section anchor 101 comes from the frictional resistance of the surrounding rock strata of the anchoring section 3 where the anchoring section anchor 102 is located. Specifically, when the anchoring section anchor 102 is connected to the threaded hole 15 of the retrieval device 2 through the screw 14, rotating the free section anchor 101 causes the retrieval device 2 to generate a first torque (e.g., clockwise torque) synchronously with the rotation of the free section anchor 101. Further, due to the force of the surrounding rock and soil, the anchoring section anchor 102 is firmly anchored in the rock strata, maintaining the anchoring effect, so that the screw 14 is firmly anchored in the rock strata together with the anchoring section anchor 102, thereby having a second torque in the opposite direction relative to the rotation of the retrieval device 2. In other words, the second torque generated by the screw 14 comes from the opposing torque generated by the engagement of the screw 14 and the lower anchoring section anchor 102 under the action of the surrounding rock resistance.

[0070] According to a preferred embodiment, the free section anchor 101 is rotated continuously or intermittently. Under the combined action of a first torque (T1) and a second torque (T2) that are in opposite directions, the threads of the screw 14 and the initial part of the threaded hole 15 are gradually loosened until the screw 14 is disengaged from the threaded hole 15. Furthermore, after the screw 14 is disengaged from the threaded hole 15, the anchor section 102 connected to the bottom end of the screw 14 remains in the rock stratum to maintain the anchoring effect.

[0071] According to a preferred embodiment, when the anchor bolt 1 or the free section of the anchor bolt 101 rotates, hydraulic oil can be injected into the oil pipe channel 13 eccentrically arranged on the surface of the screw 14 via the pressurization line 10, so that the hydraulic oil seeps into the gap between the screw 14 and the threaded hole 15. In particular, the number of oil pipe channels 13 eccentrically arranged on the surface of the screw 14 can be one or more.

[0072] According to a preferred embodiment, when hydraulic oil seeps into the gap between the screw 14 and the threaded hole 15, it generates a static pressure torque in the radial direction, thereby providing a hydraulic torque for the relative rotation and disengagement between the auxiliary screw 14 and the threaded hole 15. Preferably, the hydraulic pressure generated by the hydraulic oil mainly provides auxiliary lubrication force for the screw 14 to unscrew the threads at the initial connection point with the threaded hole 15, and subsequent hydraulic oil can provide auxiliary lubrication. In particular, the hydraulic oil used in this invention can be a commonly used engineering hydraulic oil, such as Zhengda anti-wear hydraulic oil No. 32, 46, and 68. Alternatively, the hydraulic oil meets the requirement of a kinematic viscosity of 30-67 mmHg at 40°C. 2 / s is sufficient.

[0073] According to a preferred embodiment, such as Figure 2 As shown, the pressurized line 10 (or oil pipe 19) outside the borehole 7 extends to the vicinity of the recovery device 2 and can form an oil pipe 19 that provides lubricating hydraulic oil to the gap between the screw 14 and the threaded hole 15. In addition, the oil pipe 19 is connected to an automatic hydraulic oil pump outside the borehole 7.

[0074] Specifically, the free section anchor 101 may have an internal channel allowing the passage of the tubing 19, which extends through the internal channel and passes through the bottom of the support platform 12 until it connects to the top of the threaded hole 15 or the top face of the thread 14. In particular, the tubing 19 may rotate with the free section anchor 101. Alternatively, the tubing 19 may exist independently of the internal channel of the free section anchor 101 without rotating with it.

[0075] According to a preferred embodiment, such as Figure 2 and Figure 6 As shown, the oil pipe 19 can pass through the support platform 12 and can be connected via quick-connect male plug 18a and quick-connect female plug 18b. Furthermore, the oil pipe 19 can extend through the support platform 12 and connect to the oil pipe channel 13 eccentrically positioned on the surface of the screw 14. Alternatively, hydraulic oil can also directly seep into the micro-gap 21 between the screw 14 and the threaded hole 15 via the oil pipe 19.

[0076] According to a preferred embodiment, see Figure 6 To enable recycling by the recycling device 2, the support platform 12 is lowered so that the male quick-connect plug 18a and the female quick-connect plug 18b at its lower part can mate. The female quick-connect plug 18b has four interfaces to facilitate the mating of the male quick-connect plug 18a and the female quick-connect plug 18b. In particular, Figure 6 a shows an isometric structural diagram of the quick connector male plug 18a and quick connector female plug 18b before they are mated; Figure 6b shows a front view of the quick-connect male plug 18a and quick-connect female plug 18b before mating. Further, the quick-connect male plug 18a can be inserted into the quick-connect female plug 18b and then mated by rotation (e.g., clockwise rotation). After mating, see... Figure 7 .

[0077] According to a preferred embodiment, Figure 8 A schematic diagram showing the installation of the support platform 12 and the quick connector (specifically, the quick connector male plug 18a) within the recycling device 2 is shown. Specifically, the quick connector male plug 18a and the support platform 12 can be engaged via a magnetic connector 23. The magnetic connector 23 can be internally housed within the support platform 12. The magnetic connector 23 is used for connecting the quick connector male plug 18a and the support platform 12. In particular, after the quick connector male plug 18a and quick connector female plug 18b are engaged, pulling upwards from the support platform 12 will separate the support platform 12 from the quick connector.

[0078] According to a preferred embodiment, hydraulic oil can be injected via oil pipe 19 along the extension direction of the free section anchor bolt 101 to the top of the threaded hole 15 or the top surface of the screw 14, and pumped through the inner oil pipe channel 20 connected to oil pipe 19 to the oil pipe channel 13 eccentrically disposed on the surface of the screw 14, so that the hydraulic oil can penetrate into the micro-gap 21 between the screw 14 and the threaded hole 15, thereby providing a static pressure torque by immersing the hydraulic oil in the micro-gap 21. In particular, in this invention, the pressure required to loosen the threads between the screw 14 and the threaded hole 15 is approximately 20 MPa or less, which is far less than the working pressure range of commonly used manual booster pumps and hydraulic oils.

[0079] According to a preferred embodiment, Figure 9 A schematic diagram of the hydraulic oil injection path along the oil pipe 19 is shown when the free section anchor 101 is tensioned. Specifically, the free section anchor 101 is tensioned so that the support platform 12 meshes with the ring tooth 11. The hydraulic oil is injected into the micro gap 21 through the oil pipe 19, and seeps into the threaded hole 15 between the screw 14 and the recovery device 2 through the inner oil pipe channel 20 and the oil pipe channel 13, thereby generating a static pressure torque. Combined with the rotation caused by the meshing of the support platform 12 with the upper part of the recovery device 2, the recovery device 2 can be recovered.

[0080] In particular, the inner oil pipe channel 20 can be set up for soil environments with harder geological conditions. Because the soil is harder, the anchoring tightness between the inner oil pipe channel 20 and the free section anchor rod 101 is relatively strong, and the space for slight rotation is relatively small. Therefore, the opposite torque provided by the soil is also relatively large. Thus, hydraulic oil can be provided through the inner oil pipe channel 20 to the oil pipe channel 13 of the screw 14 to promote the generation of opposite torque between the screw 14 and the threaded hole 15, thereby loosening the threads.

[0081] In some alternative embodiments, the inner oil pipe channel 20 may also be fixed to the outer wall of the free section anchor 101, extending with the free section anchor 101 into the hollow structure of the recovery device 2, and passing through the support platform 12 until it extends to the top surface of the threaded hole 15. Therefore, the inner oil pipe channel 20 can be engaged with the outer side of the free section anchor 101 as it rotates.

[0082] Specifically, hydraulic oil can be injected via oil pipe 19 along the extension direction of the free section of anchor bolt 101 to the top of threaded hole 15 or the top surface of screw 14, and then seep into the micro-gap 21 between screw 14 and threaded hole 15 through oil pipe channel 13 eccentrically provided on the surface of screw 14. The hydraulic oil is immersed in the micro-gap 21 to provide static pressure torque. Alternatively, without oil pipe channel 13, hydraulic oil can also directly seep into the micro-gap 21 between screw 14 and threaded hole 15.

[0083] In an alternative embodiment, an external oil pipe channel (not shown in the figure) may also be provided, which can extend and be fixed along the outer wall of the recovery device 2. Further, the external oil pipe channel can penetrate the outer wall of the recovery device 2 and extend into the threaded hole 15. Specifically, hydraulic oil can be input from outside the recovery device 2 into the micro-gap 21 between the screw 14 and the threaded hole 15 through the external oil pipe channel, so that the hydraulic oil is immersed in the micro-gap 21 to provide static pressure torque. In particular, the main oil passage of the external oil pipe channel can extend out of the threaded hole 15 and connect to the oil pipe channel 13 of the screw 14, so that hydraulic oil with eccentric static pressure torque is provided to the micro-gap 21 through the oil pipe channel 13 of the screw 14.

[0084] In one alternative embodiment, the external oil pipe channel may have an auxiliary oil pipe channel (not shown in the figure). Further, the auxiliary oil pipe channel of the external oil pipe channel may be configured with a predetermined angle relative to the axial direction of the screw 14. Specifically, the auxiliary oil pipe channel is configured to directly supply hydraulic oil to the micro-gap 21 between the screw 14 and the threaded hole 15, thereby providing a static pressure torque.

[0085] On the other hand, without the oil pipe channel 13, the hydraulic oil in the external oil pipe channel can also directly seep into the micro-gap 21 between the screw 14 and the threaded hole 15. For example, the hydraulic oil can fill the micro-gap 21 only through the auxiliary oil pipe channel.

[0086] Specifically, the main oil circuit and branch oil circuit through the external oil pipe channel can supply hydraulic oil to the micro gap 21 between the screw 14 and the threaded hole 15 from different directions and in different forms. Moreover, the process of the hydraulic oil providing static pressure torque in the two oil circuits is not exactly the same. Different oil circuits ensure that the hydraulic oil can completely immerse the micro gap 21 from different angles, thereby giving the micro gap 21 a uniform static pressure torque.

[0087] In one alternative embodiment, the inner oil pipe channel 20 and the outer oil pipe channel can be provided simultaneously. Further, when the screw 14 has multiple eccentrically arranged oil pipe channels 13, the inner oil pipe channel 20 and the outer oil pipe channel can each be connected to different oil pipe channels 13 to provide hydraulic oil from different eccentric directions to the micro-gap 21 between the screw 14 and the threaded hole 15. In particular, when an outer oil pipe channel is provided, the inner oil pipe channel 20 and the outer oil pipe channel can operate independently or simultaneously.

[0088] According to a preferred embodiment, the contact point between the screw 14 and the threaded hole 15 can be sealed with a sealing ring 16, which can also be used in conjunction with an annular gasket 17 connected to the anchor rod 1. Specifically, the sealing ring 16 is an O-ring.

[0089] According to a preferred embodiment, the hydraulic-mechanical recovery device 2 provided by the present invention can be used not only for the recovery of anchor bolts 1, but also for the recovery of anchor cables.

[0090] According to a preferred embodiment, in this invention, the recovered parts are the free section anchor bolt 101 and the recovery device 2. The screw 14 and the anchoring section anchor bolt 102 remain in the rock strata to continue the anchoring effect. The separation of the anchor bolt 1 from the recovery device 2 is actually achieved by the free section anchor bolt 102 driving the recovery device 2 to rotate and separate from the screw 14 inside the threaded hole 15 of the recovery device 2.

[0091] According to a preferred embodiment, in the prior art, when monitoring the stress change of anchor bolt 1 using strain sensor 9, the monitoring and transmission frequency of strain sensor 9 is usually known and fixed. However, when the anchoring force of anchor bolt 1 abnormally decreases, the anchoring effect of anchor bolt 1 will be greatly reduced or even disappear. Strain sensor 9 typically only sends corresponding monitoring data at preset sampling nodes, and controller 5 can only determine the anchoring force of anchor bolt 1 upon receiving the corresponding monitoring data. Therefore, when the anchoring force of anchor bolt 1 changes abnormally, conventional monitoring and judgment methods have a certain lag. This lag is problematic for monitoring the stress change of anchor bolt 1 using strain sensor 9. For reinforcing the strata with cables, this is extremely unfavorable, especially when the delayed transmission and reception effect continues to accumulate. The error between the actual change in the anchoring force of the anchor bundle and the expected change may be as high as several times. The change in the anchoring force of the anchor bundle, especially when retrieving anchor rod 1, also affects the timing of secondary grouting of the anchor bundle through the grouting section, thus affecting the anchoring quality. Especially when the anchoring force of anchor rod 1 is significantly lower than a certain range of the set threshold, if secondary grouting is not carried out in time, even if grouting is carried out later, the anchoring force of anchor rod 1 may not be able to be restored to the original level because the best time for grouting is missed.

[0092] According to a preferred embodiment, in this invention, the sampling period of the strain sensor 9 can be set according to a preset strain amplitude corresponding to the stress change of the anchor bolt 1. In other words, during the retrieval of the anchor bolt 1, the time-related stress change information of the anchor bolt 1 is recorded and transmitted via the strain sensor 9 using the preset strain amplitude of the anchor bolt 1 as the trigger event. Specifically, the preset strain amplitude can be set by engineering designers based on engineering experience or calculated values ​​based on engineering simulation experiments. For example, for anchoring soil layers with known geological conditions, the attenuation change of the anchor bolt 1 when retrieving the anchor cable from the stratum can be simulated by software, and a corresponding time-related change curve of the anchoring force can be generated. Thus, the preset strain amplitude can be set according to the theoretical change trend of the anchoring force of the anchor cable bundle.

[0093] Preferably, the sampling period of the strain sensor 9 is the time consumed for each preset strain amplitude to be generated by the anchor rod 1 or for each preset strain amplitude to be reduced by the anchoring force of the anchor rod 1. When the stress change of the anchor rod 1 accelerates or slows down, the time consumed for the anchor rod 1 to generate a single preset strain amplitude will also change. In particular, the ratio of the sampling period of the strain sensor 9 to the preset strain amplitude can be used to characterize the stress change rate of the anchor rod 1, thereby revealing the anchoring force decay rate of the anchor rod 1. Specifically, the larger the ratio, the slower the anchoring force decay rate of the anchor rod 1, that is, the longer the time required for the anchor rod 1 to generate a single preset strain amplitude or for its anchoring force to decrease by a single preset strain amplitude; conversely, the smaller the ratio, the faster the anchoring force decay rate of the anchor rod 1, that is, the shorter the time required for the anchor rod 1 to generate a single preset strain amplitude or for its anchoring force to decrease by a single preset strain amplitude.

[0094] According to a preferred embodiment, when the rate of attenuation of the anchoring force of the anchor bolt 1 slows down, the strain sensor 9 can reduce the frequency and amount of monitoring data transmitted to the controller 5. This reduces the amount of data interaction and the delay generated during data transmission, making the controller 5's analysis and calculation of the anchoring force of the anchor bolt more timely and smooth. In particular, it can respond promptly to changes in the anchoring force of the anchor bolt, thereby enabling timely reinforcement of the anchoring force of the anchor bolt 1 through the grouting section.

[0095] According to a preferred embodiment, as the anchoring force of the anchor bolt 1 continuously decreases, the risks corresponding to different anchoring force variation ranges are different, and the corresponding grouting volumes are also different. Preferably, for different anchoring force variation ranges, the sampling period of the strain sensor 9 is different, and the corresponding preset strain amplitude is also different. Specifically, engineering designers can set different anchoring force variation ranges for the anchor bolt 1 according to the anchoring project requirements, and set different preset strain amplitudes for each anchoring force variation range, so as to adjust the monitoring frequency of the strain sensor 9 on the anchor bolt 1 in a timely manner as the anchoring force changes, thereby improving the timeliness of anchoring force monitoring of the anchor bolt 1.

[0096] Specifically, as the anchoring force of the anchor cable bundle continuously decreases, the possibility of anchor cable failure increases. Therefore, as the anchoring force of the anchor cable bundle decreases, the preset strain amplitude of the anchor rod 1 can be linearly / nonlinearly reduced to shorten the corresponding sampling period. This allows the strain sensor 9 to monitor the anchoring force of the anchor rod 1 more frequently, enabling timely detection of changes in the anchoring force of the anchor cable bundle. Especially during the process of continuously decreasing anchoring force, the grouting unit can be activated in a timely manner to perform secondary grouting on the anchor cable, thus responding to the attenuation of anchoring force and maintaining the corresponding anchoring effect through timely grouting. Conversely, when the anchoring force of the anchor cable bundle increases or recovers after grouting, the preset strain amplitude of the anchor rod 1 can be linearly / nonlinearly increased with the increase in anchoring force.

[0097] Therefore, as the anchoring force of the anchor cable bundle continuously decreases, shortening the sampling period of the strain sensor 9 allows the controller 5 to analyze and determine the anchoring force of the anchor cable bundle more frequently and intensively. This enables timely detection of the attenuation state of the anchoring force and prompt initiation of secondary grouting. Furthermore, the monitoring frequency of the strain sensor 9 can be adjusted in real time based on changes in the anchoring force, making the monitoring frequency more reasonable and accurate. In particular, frequent monitoring may be unnecessary when the attenuation of the anchoring force is relatively weak, as this would increase data exchange, consume computing resources, and cause delays. Excessive data output would also generate a certain amount of false data, which would affect the controller 5's analysis and determination of the anchoring force, thus impacting the optimal grouting timing.

[0098] According to a preferred embodiment, in this invention, the monitoring unit can monitor the stress-strain changes of the free section of the anchor rod to reflect the magnitude of the anchoring force of the anchor cable or anchor rod in real time, thereby providing data support for the quality of the anchoring project and evaluating the expected anchoring effect. Secondly, if the anchoring project does not achieve the expected effect, a grouting unit can be used to perform secondary grouting on the anchor rod to increase the corresponding anchoring force. In addition, the main parts of the recyclable anchor cable or anchor rod of this invention are designed using a modular and mechanized construction method, which is beneficial for the mass processing and manufacturing of anchor cables or anchor rods and can significantly reduce project costs.

[0099] Example 2

[0100] This embodiment provides a method for recycling recyclable anchor bolts. Specifically, the recycling method provided in this embodiment can be used to recycle the recyclable anchor bolts described in Embodiment 1.

[0101] According to a preferred embodiment, this embodiment provides a method for recycling recyclable anchor bolts, which may include:

[0102] The anchor rod 1 is brought into a tensioned state so that the annular tooth 11 in the recovery device 2 engages with the support platform 12.

[0103] The free section anchor 101 is driven to rotate in a first direction and the recovery device 2 generates a first torque in the first direction.

[0104] The anchor bolt 102 in the anchoring section generates a second torque that is opposite to the first torque.

[0105] Under the action of the first and second torques, which are opposite to each other, the free section anchor 101 separates from the anchored section anchor 102.

[0106] Specifically, before recovering the anchor bolt 1, the process includes: pre-assembling the free section anchor bolt 101 and the anchored section anchor bolt 102 with the recovery device 2, and inserting the anchor bolt 1 together with the recovery device 2 into the stratum to be anchored through the borehole 7.

[0107] According to a preferred embodiment, the recycling method provided in this embodiment further includes:

[0108] Before or during the tensioning of the free section anchor rod 101 and its rotation along the first direction by the drive, hydraulic oil is injected into the oil pipe channel 13 of the anchoring section anchor rod 102 through the external pressurization pipeline 10, so that the hydraulic oil seeps into the threaded hole 15 (specifically the micro gap 21) of the recovery device 2, thereby providing the static pressure torque to help the screw 14 of the anchoring section anchor rod 102 loosen from the threaded hole 15.

[0109] According to a preferred embodiment, the recycling method provided in this embodiment further includes:

[0110] The stress change of the anchor rod 1 is monitored in real time by strain sensor 9 to obtain strain data.

[0111] The controller 5 determines the anchoring status of the anchor rod 1 based on the strain data received from the strain sensor 9.

[0112] Specifically, the controller 5 can perform calculations and analyses on the stress monitoring data of the strain sensor 9 to provide data support for the quality evaluation of the anchoring project.

[0113] According to a preferred embodiment, the recycling method provided in this embodiment may further include:

[0114] The controller 5 determines the anchoring state of the anchor rod 1 based on the strain data received from the strain sensor 9. When the anchoring state of the anchor rod 1 is lower than the preset anchoring force threshold or the anchoring force threshold range, the grouting unit is started to perform secondary grouting for the anchor rod 1.

[0115] Specifically, if the anchoring force of the anchor rod 1 is less than the set threshold as detected by the strain sensor 9, reinforcing grout can be injected into the anchor rod 1 using the grouting device 6 and the grouting channel 4 to improve or maintain the anchoring force of the anchor rod 1, especially the anchoring section 3 of the anchor rod 1, through secondary grouting.

[0116] Furthermore, the recycling method provided in this embodiment may also include:

[0117] As the rate of attenuation of the anchoring force of anchor bolt 1 slows down, strain sensor 9 can reduce the frequency and amount of monitoring data transmitted to controller 5. In particular, as the rate of attenuation of the anchoring force of anchor bolt 1 slows down, the amount of system data interaction can be reduced, and the latency generated during data transmission can be decreased, making the analysis and calculation of the anchoring force of anchor bolt by controller 5 more timely and smooth.

[0118] It should be noted that the specific embodiments described above are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this invention, and these solutions all fall within the scope of this invention and its protection. Those skilled in the art should understand that this specification and its accompanying drawings are illustrative and not intended to limit the scope of the claims. The scope of protection of this invention is defined by the claims and their equivalents. This specification contains multiple inventive concepts; terms such as "preferredly," "according to a preferred embodiment," or "optionally" indicate that the corresponding paragraph discloses an independent concept. The applicant reserves the right to file divisional applications based on each inventive concept.

Claims

1. A recyclable anchor bolt, characterized in that, include: Anchor bolt (1), including free section anchor bolt (101) and anchored section anchor bolt (102); The recovery device (2) includes a cylindrical shell with an annular hole at the top for lowering and connecting the free section anchor rod (101). When anchored using the anchor rod (1), the free section anchor rod (101) and the screw rod (14) are threaded together, and the anchored section anchor rod (102) is detachably connected to the screw rod (14). The recovery device (2) is equipped with an annular tooth (11) and a support platform (12) that can be movably engaged with the annular tooth (11) as the anchor (1) is tensioned. When the anchor rod (1) is under tension, the free section anchor rod (101) is driven to rotate in a first direction and the recovery device (2) generates a first torque in the first direction. The anchoring section anchor rod (102) generates a second torque based on the rotation of the free section anchor rod (101) so as to allow the free section anchor rod (101) to disengage from the anchoring section anchor rod (102) under the action of the first torque and the second torque, which are opposite to each other. The bottom of the recovery device (2) is provided with a threaded hole (15) that allows the anchoring section anchor rod (102) to be detachably connected to the recovery device (2). The surface of the screw (14) that engages with the threaded hole (15) of the anchoring section anchor rod (102) is provided with at least one eccentric oil pipe channel (13). The recovery device (2) is connected to an oil pipe (19) that extends axially along the free section anchor (101) and passes through the support platform (12). The oil pipe (19) is connected by a quick-connect male plug (18a) and a quick-connect female plug (18b) to extend to the micro gap (21) between the screw (14) and the threaded hole (15) to allow the oil pipe (19) to be connected to the oil pipe channel (13) through the inner oil pipe channel (20). The quick-connect male plug (18a) is engaged with the support platform (12) by a magnetic chuck (23).

2. The recyclable anchor bolt according to claim 1, characterized in that, Before or when the free section anchor (101) is in a tensioned state and is driven to rotate in the first direction, hydraulic oil is injected into the micro gap (21) between the screw (14) and the threaded hole (15) through the oil pipe (19) to allow the hydraulic oil to provide a static pressure torque to assist the screw (14) in disengaging from the threaded hole (15).

3. The recyclable anchor bolt according to claim 1, characterized in that, It also includes a monitoring unit, which comprises a strain sensor (9) and a controller (5) that are signal-connected to each other, wherein, A strain sensor (9) is used to acquire time-dependent stress-related strain data of the anchor rod (1); The controller (5) is used to determine the anchorage state of the anchor rod (1) based on the strain data from the strain sensor (9).

4. The recyclable anchor bolt according to claim 1, characterized in that, It also includes a grouting unit, which comprises a fluidly connected grouter (6) and a grouting channel (4), wherein, One or more grouting channels (4) are deployed within the anchor bolt (1) to provide channels for conveying reinforcing grout; Grouting device (6) is provided at the borehole opening (7) to provide the reinforcing grout to the grouting channel (4).

5. The recyclable anchor bolt according to claim 3, characterized in that, The strain sensor (9) records and transmits time-related stress change information of the anchor rod (1) using the preset strain amplitude of the anchor rod (1) as the start event. The preset strain amplitude of the anchor rod (1) can be adjusted based on the time-related curve of the anchoring force of the anchor rod (1).

6. The recyclable anchor bolt according to claim 5, characterized in that, The sampling period of the strain sensor (9) for the anchoring force of the anchor rod (1) is determined based on the time consumed by the anchor rod (1) for each single preset strain amplitude. The ratio of the sampling period of the strain sensor (9) to the preset strain amplitude can characterize the stress change rate of the anchor rod (1).

7. A method for recycling a recyclable anchor bolt as described in any one of claims 1 to 6, characterized in that, include: The control anchor (1) is in a tensioned state to allow the ring tooth (11) of the recovery device (2) to engage with the support platform (12); Drive the free section anchor bolt (101) to rotate in a first direction and cause the recovery device (2) to generate a first torque in the first direction; The anchor bolt (102) in the anchoring section generates a second torque based on the rotation of the free section anchor bolt (101); The free section anchor (101) is separated from the anchored section anchor (102) under the action of a first torque and a second torque that are opposite to each other.

8. The recycling method according to claim 7, characterized in that, Also includes: Before or during the free section anchor rod (101) being in a tensioned state and being driven to rotate in the first direction, hydraulic oil is injected into the oil pipe channel (13) of the anchoring section anchor rod (102) using an external pressurization line (10), so that the hydraulic oil penetrates into the micro gap (21) to provide a static pressure torque to assist the anchoring section anchor rod (102) in loosening from the threaded hole (15).

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