Automatic remedial device for anchor rod after being unanchored and method of use thereof

Abstract

The present invention discloses an automatic remedial device for anchor rods after they become unanchored and a method for use, belonging to the field of rock and soil anchoring technology. It comprises an end-split, enlarged, special-shaped rod body and an anchor remedial device. After the anchor rod completes anchoring support, if the surrounding rock is deformed and damaged or the bonding force between the anchor rod and the anchoring agent bond is weakened, resulting in the anchoring agent bond and the anchor rod becoming unanchored, the anchor remedial device will slide on the anchor rod to achieve failure relief. When the critical allowable displacement is reached, the anchor remedial device will limit the relative displacement between the anchor rod and the anchoring agent bond, thereby achieving remedial measures for anchor failure. In this process, mechanical reinforcement between the surrounding rock and the anchor body is achieved by squeezing the resistance-increasing saw teeth outward, thereby improving the stability of the surrounding rock. It has the characteristics of constant resistance, failure relief, automatic remediation, and economic applicability, meeting the support requirements of deep surrounding rock large deformation tunnels and complex geological environments, and has a simple structure and stable performance.

Description

Technical Field

[0001] The invention relates to an automatic remediation device for anchor rods after they become unanchored and a use method thereof, and is particularly suitable for use in mine tunnels, tunnels, and water conservancy and hydropower projects, belonging to the technical field of rock and soil anchoring. Background Art

[0002] Anchor support is widely used in surface engineering projects such as slopes and foundation pits. Similarly, in the field of supporting underground rock projects such as roadways, tunnels, and tunnels, anchors are also an effective support technology to control the deformation and damage of surrounding rock. As one of the commonly used support forms for supporting slopes and surrounding rock stability, anchor support has the characteristics of low cost, flexible use, and good support effect compared to other support methods. With the increase in mining depth and mining intensity and the large-scale construction of underground projects such as highways, railway tunnels, and water conservancy and hydropower, the engineering and geological conditions faced are becoming increasingly complex, and the surrounding rock often exhibits large deformation characteristics. This places higher demands on the support of underground projects such as deep-buried roadways and tunnels.

[0003] With the increase in mining depth and the increasing complexity of geological conditions, traditional anchor rods and existing anchor rods have gradually exposed their shortcomings, as follows: First, resin anchoring agents are currently the most commonly used and most effective anchoring agents for anchoring in underground projects. Affected by the characteristics of the surrounding rock, stress environment, bonding properties of resin rolls, and construction technology, the phenomenon of non-full-length anchor unit anchor rod slippage failure occurs frequently, resulting in large deformation of the surrounding rock in underground projects and even support failure accidents, which restricts the development and promotion of anchor support technology and threatens the production safety of mines. When designing anchor support parameters, the main consideration is the control effect of the support structure on the surrounding rock to prevent instability and damage caused by insufficient support strength. Less consideration is given to the unanchoring failure of the anchor rod and anchoring agent, anchoring agent and surrounding rock, anchor body (a combination of anchor rod and anchoring agent) and surrounding rock. Second, underground projects such as roadways, tunnels, and excavations are massive, requiring numerous anchor rods covering vast areas. Real-time monitoring of every anchor point and every partially anchored support rod would be both labor-intensive and extremely difficult to ensure. Third, even if unanchored anchor rods or anchor bodies are detected and inspected during the project, the effectiveness of anchor support cannot be guaranteed due to the difficulty of detecting them immediately. Furthermore, secondary remedial anchoring is labor-intensive and time-consuming, significantly increasing the cost of rework and support. Fourth, if minor relative slip occurs between the anchor body and the surrounding rock, the anchor rod can still provide some support. However, if unanchored anchor rods and the anchoring agent become ineffective, the anchor rods will immediately fail, posing a greater threat and hazard. In summary, as the support problems in deep underground engineering fields are increasing, there is an urgent need for an anchor device and its use method that can automatically perform anchoring remediation when the anchor rod and anchoring agent bond or the anchor body and surrounding rock become unanchored and fail. Summary of the Invention

[0004] Technical Problem: To address the shortcomings of existing technologies, an automatic anchor remediation device and its use method are provided. This device can automatically remediate anchoring failure after the anchor and anchoring agent bond fails. It also allows for pressure relief during post-failure anchoring repair, thereby re-enforcing the anchor support and improving its anchoring strength.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention provides an automatic remediation device for anchor rods after being unanchored, comprising a special-shaped anchor rod, wherein the tail of the special-shaped anchor rod is provided with an anchor rod threaded section, the end of the special-shaped anchor rod is provided with an anchoring end head, the middle section of the anchor rod is between the anchor rod threaded section and the anchoring end head, and the anchor rod threaded section is provided with a convex tray and an anti-slip wire nut;

[0006] The anchoring end includes a split enlarged end anchor head arranged at the end of the special-shaped anchor rod, an anchoring remedial device is provided on the split enlarged end anchor head, and a hollow round tray is provided on the middle section of the anchor rod behind the anchoring remedial device to prevent the anchoring agent from flowing into the middle section of the anchor rod. The split enlarged end anchor head is a gradient structure with a larger front and a smaller back. The anchoring remedial device is sleeved on the split enlarged end anchor head through a through hole provided in the middle, forming an anchor rod tensioning and tightening structure with the gradient structure of the split enlarged end anchor head; an umbrella-shaped metal claw structure whose opening and closing is controlled by an expansion agent is provided behind the anchoring remedial device; the diameter of the hollow round tray matches the preset anchor hole.

[0007] Furthermore, the split-type expanded end anchor head is a tubular structure that is split in the middle, and soft elastic fibers are filled in the split space to expand the tubular structure to form a gradual trumpet-mouth structure. At the same time, the soft elastic fibers also bring elasticity to the tubular structure, so that the anchoring remedial device can move on the split-type expanded end anchor head when subjected to tension, thereby changing the tightening force.

[0008] Furthermore, the anchoring remedial device includes two concentrically arranged hollow annular structures of different sizes, wherein the hollow annular structure with a smaller outer diameter is the level I annular part, and the hollow annular structure with a larger outer diameter is the level II annular part. The diameter of the through hole in the hollow annular structure is slightly larger than the middle section of the anchor rod and smaller than the outer diameter after the split surface of the enlarged end anchor head is fully fitted; the outer diameter of the level II annular part is slightly smaller than the diameter of the anchor hole; an umbrella-shaped metal claw structure is provided on the level I annular part, and the umbrella-shaped metal claw structure includes a plurality of rigid metal wedge rods movably arranged at equal intervals on the level I annular part, and the inner layer of each rigid metal wedge rod is provided with an expansion agent that can prop it open.

[0009] Furthermore, a matching wedge-shaped buckle is provided on the level I annular portion at a position matching the rigid metal wedge-shaped rod, and the wedge-shaped buckle and the rigid metal wedge-shaped rod are fixed by screws and nuts, so that the rigid metal wedge-shaped rod can rotate around the raised wedge-shaped buckle on the anchoring remedial device.

[0010] Furthermore, a plurality of anti-slip metal blocks are provided in the unmeasured section where the middle section of the anchor rod is connected to the split-type enlarged end anchor head. When the special-shaped anchor rod is pushed into the anchor hole, the anti-slip metal blocks will restrict the anchoring remedial device from sliding outward from the hole.

[0011] Furthermore, the outer wall of the II-level annular part is provided with a plurality of built-in outer grooves at intervals along the circumference, and each outer groove is provided with a metal tooth that can be extended and retracted as the II-level annular part moves on the split enlarged end anchor head. The metal teeth include a metal support shaft, a resistance-increasing serration is provided at the end of the metal support shaft, a metal wing plate is provided on the resistance-increasing serration and the metal support shaft, and a spring is provided between the metal wing plate and the outer groove to press the metal claw out of the outer groove; when the special-shaped anchor rod and the anchor agent bond formed after the anchor agent solidifies slip relative to each other, the anchor remedial device slides toward the end on the outer wall of the enlarged end anchor head to achieve a step-by-step increase in pressure and resistance, and the tail end of the metal support shaft on the inner wall of the anchor remedial device is squeezed by the outer wall of the enlarged end anchor head, thereby compressing the spring to make the resistance-increasing serration extend out of the outer groove and penetrate into the anchor hole wall, thereby increasing the resistance between the anchor remedial device and the anchor hole, thereby preventing slippage between the anchor remedial device and the special-shaped anchor rod and strengthening the anchoring between the entire anchor rod and the anchor hole.

[0012] Furthermore, an expansion agent is attached to the annular area around the anti-slip metal block on the outside of the special-shaped anchor rod, and the expansion agent is used to support the rigid metal wedge rod to the four sides to complete the dual anchoring of the anchor agent anchoring and the mechanical anchoring of the rigid metal wedge rod; when the special-shaped anchor rod and the anchor agent bond formed after the anchor agent solidifies slip relative to each other, the anchoring remedial device will achieve pressure relief and resistance increase by sliding on the enlarged end anchor head, and increase the resistance between the anchor body and the anchor hole by squeezing the metal support shaft on the inner wall of the anchoring remedial device and the outer wall of the enlarged end anchor head, thereby achieving mechanical anchoring between the special-shaped anchor rod and the anchor agent bond, and strengthening the anchoring force between the anchor body and the anchor hole.

[0013] A method for using an automatic remedial device after an anchor rod is unanchored, the steps of which are as follows:

[0014] Drill anchor holes at pre-marked locations in the surrounding rock, insert flexible fibers into split-type enlarged anchor heads, and then wrap a layer of highly elastic film around the expanded anchor heads to prevent leakage of the flexible fibers and to prevent the fracture surfaces of the ends from shifting during subsequent extrusion.

[0015] Insert the anchoring remedial device from the free side of the special-shaped anchor rod, slide it to a position where human power cannot slide, weld an anti-slip metal block on the side close to the anchoring remedial device and close to the free end to prevent the anchoring remedial device from moving backward during the insertion of the entire anchor rod, and insert the hollow round tray from the free end of the special-shaped anchor rod and install it;

[0016] Wrap the expansion agent with a high elastic film in the annular area where the anti-slip metal block is located. The expansion agent reaction time should be set according to the material ratio and faster than the initial setting time of the anchoring agent;

[0017] Place the anchoring agent mortar roll, curing agent roll and the entire anchor rod into the anchor hole, start the agitator to rotate and stir the rod body, and after the anchoring agent solidifies, install the convex tray and anti-slip nut on the anchor rod exposed in the anchor hole in sequence, and provide pre-tightening force along the thread rise angle by pre-tightening the anti-slip nut on the threaded section of the anchor rod;

[0018] Before the anchoring agent begins to set, the expansion agent expands and props up the rigid metal wedge rod and inserts it into the wall of the anchor hole;

[0019] When the special-shaped anchor rod and the anchoring agent bond fail to become detached from the anchor, the anchoring remedial device will slip relative to the special-shaped anchor rod due to stress pulling. Since the inner diameter of the anchoring remedial device is smaller than the diameter after the split surface of the enlarged end anchor head is completely squeezed and fitted, it will be stuck and fixed again after slipping to achieve remediation, so that the anchoring agent bond and the special-shaped anchor rod are mechanically anchored again, achieving the effect of pressure relief after failure; at the same time, by squeezing the metal support shaft on the inner wall of the level II annular part in the anchoring remedial device, the resistance-increasing serrations are expanded and embedded in the wall of the anchor hole, thereby enhancing the anchoring force, achieving a secondary reinforcement effect between the anchor body and the surrounding rock.

[0020] Beneficial effects: The present invention can be applied to rock underground projects such as deep coal mines and metal mine tunnels, deep buried tunnels, and water conservancy and hydropower projects. Anchor remedial measures after the anchor rod and anchoring agent or the anchor body and surrounding rock fail to be de-anchored are achieved through the anchor rod and the anchoring remedial device itself, which greatly saves the manpower and high costs consumed by repeated inspections, monitoring and support rework in the project. The present invention completes support through dual anchoring of anchoring agent anchoring and mechanical anchoring, greatly improving the anchoring force between the anchor body and the surrounding rock; after the anchor rod and anchoring agent cement or the anchor body and surrounding rock fail to be de-anchored, the anchoring support remedial can be automatically performed, and while releasing the pressure after failure, the friction between the anchor body and the inner wall of the anchor is further increased by the serration relaxation, thereby improving the anchoring strength of the anchor rod. It can meet the requirements of deep high stress and impact ground pressure tunnel support, and is an effective form of support. Moreover, it has a simple structure, is easy to operate, and has a low cost. It can achieve high-efficiency anchoring and self-repair at the lowest cost. Compared with manual monitoring and manual repair, it has great advantages. It is suitable for engineering environments with complex geological conditions such as tunnels, coal mines, and slopes, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the anchor hole in an embodiment of the present invention.

[0022] Figure 2 This is a schematic structural diagram of the automatic remediation device for anchor rods after they become unanchored according to the present invention.

[0023] Figure 3 This is a schematic diagram of the installation of an automatic remedial device for anchor rod unanchoring in an embodiment of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the anchoring remedial device of the present invention.

[0025] Figure 5 It is a schematic cross-sectional view of the level II annular portion of the anchoring remedial device of the present invention.

[0026] In the figure: 1-convex tray, 2-special-shaped anchor rod, 3-anti-slip wire nut, 4-split enlarged end anchor head, 5-anchor hole, 6-rigid metal wedge rod, 7-anchor remedial device, 8-anchor rod thread section, 9-anchor rod middle section, 10-surrounding rock, 11-anchor agent binder, 12-high elastic film, 13-expansion agent, 14-anti-slip metal block, 15-external groove, 16-resistance-increasing serrations, 17-spring, 18-metal wing plate, 19-metal support shaft, 20-flexible elastic fiber, 21-hollow round tray, 22-screw, 23-nut, 24-wedge-shaped buckle. DETAILED DESCRIPTION

[0027] An embodiment of the invention will be further described below with reference to the accompanying drawings:

[0028] like Figure 1 and Figure 2 As shown, an automatic remedial device for anchor rods after being unanchored of the present invention comprises a special-shaped anchor rod 2, an anchor rod thread section 8 is provided at the tail of the special-shaped anchor rod 2, an anchor head is provided at the end thereof, an anchor rod middle section 9 is formed between the anchor rod thread section 8 and the anchor head, a convex tray 1 and an anti-slip thread nut 3 are provided on the anchor rod thread section 8; wherein the anchor head comprises a split-type enlarged end anchor head 4 arranged at the end of the special-shaped anchor rod 2, an anchor remedial device 7 is sleeved on the split-type enlarged end anchor head 4, and an anchor remedial device 7 is provided at the rear of the anchor remedial device 7. A hollow circular tray 21 is provided on the middle section 9 of the rod to prevent the anchoring agent from flowing into the middle section 9 of the anchor rod. The split enlarged end anchor head 4 is a gradient structure with a larger front and a smaller back. The anchoring remedial device 7 is sleeved on the split enlarged end anchor head 4 through a through hole set in the middle, forming an anchor rod tensioning and tightening structure with the gradient structure of the split enlarged end anchor head 4; an umbrella-shaped metal claw structure is provided at the rear of the anchoring remedial device 7, the opening and closing of which is controlled by the expansion agent 13; the diameter of the hollow circular tray 21 matches the preset anchor hole 5.

[0029] like Figure 3As shown, the anchoring remedial device 7 comprises two concentrically arranged hollow annular structures, one large and one small. The hollow annular structure with the smaller outer diameter is the Level I annular portion, while the hollow annular structure with the larger outer diameter is the Level II annular portion. The diameter of the through-hole in the hollow annular structure is slightly larger than the anchor rod midsection 9 and smaller than the outer diameter of the expanded end anchor head 4 after the split surfaces are fully aligned. The outer diameter of the Level II annular portion is slightly smaller than the diameter of the anchor hole 5. The Level I annular portion is provided with an umbrella-shaped metal claw structure, which comprises a plurality of rigid metal wedge rods 6 movably arranged at equal intervals on the Level I annular portion. Each rigid metal wedge rod 6 is internally coated with an expansion agent 13 that can prop it apart. A plurality of anti-slip metal blocks 14 are provided at the unmeasured section where the anchor rod midsection 9 connects to the split expanded end anchor head 4. These anti-slip metal blocks 14 prevent the anchoring remedial device 7 from sliding backward when the special-shaped anchor rod 2 is pushed into the anchor hole 5.

[0030] like Figure 4 As shown, a matching wedge-shaped buckle 24 is provided on the level I annular portion at a position matching the rigid metal wedge-shaped rod 6, and the wedge-shaped buckle 24 and the rigid metal wedge-shaped rod 6 are fixed by screws 22 and nuts 23, so that the rigid metal wedge-shaped buckle 24 can rotate around the protruding wedge-shaped buckle 24 on the anchoring remedial device.

[0031] like Figure 5 As shown, the outer wall of the II-level annular portion is provided with a plurality of built-in outer grooves 15 at intervals along the circumference, and each outer groove 15 is provided with a metal tooth that can be extended and retracted as the II-level annular portion moves on the split-type enlarged end anchor head 4, and the metal tooth includes a metal support shaft 19, and the end of the metal support shaft 19 is provided with a resistance-increasing sawtooth 16, and the resistance-increasing sawtooth 16 and the metal support shaft 19 are provided with a metal wing plate 18, and a spring 17 for pressing the metal claw to extend out of the outer groove 15 is provided between the metal wing plate 18 and the outer groove 15; when the special-shaped anchor rod 2 is solidified with the anchoring agent, the metal teeth 16 are provided with a metal support shaft 19, and the metal wing plate 18 is provided with a metal wing plate 18. When the solid undergoes relative slippage, the anchoring remedial device 7 slides toward the end on the 4 outer walls of the enlarged end anchor head to achieve a step-by-step increase in pressure and resistance. The tail of the metal support shaft 19 on the inner wall of the anchoring remedial device 7 is squeezed by the 4 outer walls of the enlarged end anchor head, thereby compressing the spring 17 to make the resistance-increasing serrations 16 extend out of the outer groove 15 and penetrate into the wall of the anchor hole 5, thereby increasing the resistance between the anchoring remedial device 7 and the anchor hole 5, thereby preventing slippage between the anchoring remedial device 7 and the special-shaped anchor rod 2 and strengthening the anchoring between the entire anchor rod and the anchor hole 5.

[0032] The method for using the automatic remediation device for anchor rod unanchoring of the present invention comprises the following specific steps:

[0033] An anchor hole 5 is drilled at a pre-marked position in the surrounding rock 10, and a flexible elastic fiber 20 is clamped into the split-type enlarged end anchor head 4. Then, a circle of high-elastic film 12 is wrapped around the outside of the enlarged end anchor head 4 to prevent the end fracture surfaces from shifting relative to each other during the subsequent extrusion process; the anchoring remedial device 7 is inserted from the free side of the special-shaped anchor rod 2 and slid to a position where human sliding is impossible. An anti-slip metal block 14 is welded on the side adjacent to the anchoring remedial device 7 and close to the free end to prevent the anchoring remedial device 7 from moving backward during the insertion of the entire anchor rod; the hollow round tray 21 is inserted from the free end of the special-shaped anchor rod 2 and installed;

[0034] The expansion agent 13 is wrapped with a high elastic film 12 in the annular area where the anti-slip metal block 14 is located. The reaction time of the expansion agent 13 should be set according to the material ratio and faster than the initial setting time of the anchoring agent;

[0035] Place the anchoring agent mortar roll, curing agent roll and the entire anchor rod into the anchor hole 5, start the stirrer to rotate and stir the rod body, and after the anchoring agent solidifies, sequentially install the convex tray 1 and anti-slip nut 3 on the anchor rod exposed in the anchor hole. Pre-tighten the anti-slip nut 2 on the threaded section 8 of the anchor rod to provide pre-tightening force along the thread lead angle;

[0036] Before the anchoring agent initially sets, the expansion agent 13 expands and props up the rigid metal wedge rod 6 and inserts it into the wall of the anchor hole 5;

[0037] When the special-shaped anchor rod 2 and the anchoring agent bond 11 become unanchored and fail, the anchoring remedial device 7 will slip relative to the special-shaped anchor rod 2 due to stress pulling. Since the inner diameter of the anchoring remedial device 7 is smaller than the diameter after the split surface of the enlarged end anchor head is completely squeezed and fitted, it will be fixed again after slipping, thereby realizing mechanical anchoring between the anchoring agent bond 11 and the special-shaped anchor rod 2, and at the same time achieving the effect of pressure relief after failure; by squeezing the metal support shaft 19 on the inner wall of the level II annular part in the anchoring remedial device 7, the resistance-increasing serrations 16 are stretched and embedded in the wall of the anchor hole 5, thereby enhancing the anchoring force, and achieving a secondary reinforcement effect between the anchor body and the surrounding rock 10.

Claims

1. An automatic remedial device for anchor bolts after they become unanchored, characterized in that: The invention comprises a special-shaped anchor rod (2), wherein the tail of the special-shaped anchor rod (2) is provided with an anchor rod thread section (8), the end of the special-shaped anchor rod (2) is provided with an anchor end head, the anchor rod middle section (9) is located between the anchor rod thread section (8) and the anchor end head, and the anchor rod thread section (8) is provided with a convex tray (1) and an anti-slip wire nut (3); The anchoring end includes a split-type enlarged end anchor head (4) arranged at the end of the special-shaped anchor rod (2); an anchoring remedial device (7) is sleeved on the split-type enlarged end anchor head (4); a hollow round tray (21) is provided on the anchor rod middle section (9) behind the anchoring remedial device (7) to prevent the anchoring agent from flowing into the anchor rod middle section (9); the split-type enlarged end anchor head (4) is a gradient structure with a larger front and a smaller rear; the anchoring remedial device (7) is sleeved on the split-type enlarged end anchor head (4) through a through hole provided in the middle, and forms an anchor rod tensioning and tightening structure with the gradient structure of the split-type enlarged end anchor head (4); an umbrella-shaped metal claw structure whose opening and closing is controlled by an expansion agent (13) is provided behind the anchoring remedial device (7); the diameter of the hollow round tray (21) matches the preset anchor hole (5); The anchoring remedial device (7) comprises two concentrically arranged hollow annular structures of different sizes, wherein the hollow annular structure with a smaller outer diameter is the first-level annular portion, and the hollow annular structure with a larger outer diameter is the second-level annular portion. The diameter of the through hole in the hollow annular structure is slightly larger than the middle section of the anchor rod (9) and smaller than the outer diameter of the split surface of the split-type enlarged end anchor head (4) after it is completely fitted together. The outer diameter of the second-level annular portion is slightly smaller than the diameter of the anchor hole (5). The first-level annular portion is provided with an umbrella-shaped metal claw structure, and the umbrella-shaped metal claw structure comprises a plurality of rigid metal wedge rods (6) movably arranged at equal intervals on the first-level annular portion, and the inner layer of each rigid metal wedge rod (6) is provided with an expansion agent (13) capable of expanding the rod. The outer wall of the II-level annular portion is provided with a plurality of built-in outer grooves (15) at intervals along the circumference, and each outer groove (15) is provided with a metal tooth that can be extended and retracted as the II-level annular portion moves on the split-type enlarged end anchor head (4), and the metal tooth includes a metal support shaft (19), and the end of the metal support shaft (19) is provided with a resistance-increasing sawtooth (16), and the resistance-increasing sawtooth (16) and the metal support shaft (19) are provided with a metal wing plate (18), and a spring (17) for pressing the metal claw to extend out of the outer groove (15) is provided between the metal wing plate (18) and the outer groove (15); when the special-shaped anchor rod (2) and the anchoring agent are solidified, the anchoring agent bonding is formed. When the body (11) slides relative to the anchoring device (7), the anchoring device (7) slides toward the end on the outer wall of the split-type enlarged end anchor head (4) to achieve step-by-step increase in pressure and resistance. The tail of the metal support shaft (19) on the inner wall of the anchoring device (7) is squeezed by the outer wall of the split-type enlarged end anchor head (4), thereby compressing the spring (17) to make the resistance-increasing serration (16) extend out of the outer groove (15) and penetrate into the wall of the anchor hole (5), thereby increasing the resistance between the anchoring device (7) and the anchor hole (5), thereby preventing the slippage between the anchoring device (7) and the special-shaped anchor rod (2) and strengthening the anchoring property between the entire anchor rod and the anchor hole (5); An expansion agent (13) is attached to the annular area around the anti-slip metal block (14) on the outer side of the special-shaped anchor rod (2), and the expansion agent (13) is used to support the rigid metal wedge rod (6) to the surrounding areas, so as to complete the double anchoring of the anchoring agent anchoring and the mechanical anchoring of the rigid metal wedge rod (6); when the special-shaped anchor rod (2) and the anchoring agent cement body (11) formed after the anchoring agent solidifies relative to each other, the anchoring remedial device (7) will slide on the split-type enlarged end anchor head (4) to achieve pressure relief and resistance increase, and the resistance between the anchor body and the anchor hole (5) is increased by squeezing the metal support shaft (19) on the inner wall of the anchoring remedial device (7) and the outer wall of the split-type enlarged end anchor head (4), thereby achieving mechanical anchoring between the special-shaped anchor rod (2) and the anchoring agent cement body (11), and strengthening the anchoring force between the anchor body and the anchor hole (5).

2. The automatic remedial device for anchor rod unanchoring according to claim 1, characterized in that: The split-type enlarged end anchor head (4) is a tubular structure that is split in the middle, and the split space is filled with soft elastic fibers (20) to expand the tubular structure to form a gradual bell-mouth structure. At the same time, the soft elastic fibers (20) also bring elasticity to the tubular structure, so that the anchoring remedial device (7) can move on the split-type enlarged end anchor head (4) when subjected to tension, thereby changing the tightening force.

3. The automatic remedial device for anchor rod unanchoring according to claim 1, characterized in that: A matching wedge buckle (24) is provided on the level I annular portion at a position matching the rigid metal wedge rod (6), and the wedge buckle (24) and the rigid metal wedge rod (6) are fixed by screws (22) and nuts (23), so that the rigid metal wedge rod (6) can rotate around the protruding wedge buckle (24) on the anchoring remedial device.

4. The automatic remedial device for anchor rod unanchoring according to claim 1, characterized in that: A plurality of anti-slip metal blocks (14) are provided at an unmeasured section where the middle section of the anchor rod (9) is connected to the split-type enlarged end anchor head (4). When the special-shaped anchor rod (2) is pushed into the anchor hole (5), the anti-slip metal blocks (14) will restrict the anchoring remedial device (7) from sliding outward from the hole.

5. A method for using the automatic remediation device for anchor rod unanchoring according to any one of claims 1 to 4, characterized in that Here are the steps: An anchor hole (5) is drilled at a pre-marked position in the surrounding rock (10), and the flexible elastic fiber (20) is clamped into the split-type enlarged end anchor head (4). Then, a circle of high elastic film (12) is wrapped around the outer side of the split-type enlarged end anchor head (4) to prevent the clamped flexible elastic fiber (20) from leaking, thereby preventing the end fracture surfaces from shifting relative to each other during the subsequent extrusion process; Insert the anchoring remedial device (7) from the free side of the special-shaped anchor rod (2) and slide it to a position where it cannot be slid by human force. Weld an anti-slip metal block (14) on the side adjacent to the anchoring remedial device (7) and close to the free end to prevent the anchoring remedial device (7) from moving backward during the insertion of the entire anchor rod. Insert the hollow round tray (21) from the free end of the special-shaped anchor rod (2) and install it. The expansion agent (13) is wrapped with a high elastic film (12) in the annular area where the anti-slip metal block (14) is located. The reaction time of the expansion agent (13) should be set according to the material ratio and faster than the initial setting time of the anchoring agent; Put the anchoring agent mortar roll, the curing agent roll and the whole anchor rod into the anchor hole (5), start the stirrer to drive the rod body to rotate and stir, and after the anchoring agent is cured, sequentially set the convex tray (1) and the anti-slip nut (3) on the anchor rod exposed section of the anchor hole, and provide pre-tightening force along the thread rise angle by pre-tightening the anti-slip nut (3) on the anchor rod thread section (8); Before the anchoring agent initially sets, the expansion agent (13) expands and props up the rigid metal wedge rod (6) and inserts it into the wall of the anchor hole (5); When the special-shaped anchor rod (2) and the anchoring agent bond (11) become unanchored and fail, the anchoring remedial device (7) will slide relative to the special-shaped anchor rod (2) due to stress pulling. Since the inner diameter of the anchoring remedial device (7) is smaller than the diameter after the split surface of the enlarged end anchor head is fully squeezed and fitted, it is stuck and fixed again after the slippage to achieve remediation, so that the anchoring agent bond (11) and the special-shaped anchor rod (2) are mechanically anchored again, achieving the effect of pressure relief after failure; at the same time, by squeezing the metal support shaft (19) on the inner wall of the second-level annular part of the anchoring remedial device (7), the resistance-increasing sawtooth (16) is stretched and embedded in the wall of the anchor hole (5), thereby enhancing the anchoring force, achieving the effect of reinforcing the anchor body and the surrounding rock (10).

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