Screw-in type pre-stressed anchor rod with built-in anchoring agent
By designing the spike part and spiral reamer in the resin anchor, the problem of poor guiding properties of the resin roll and insufficient mixing of the anchoring agent is solved, and the full mixing and efficient anchoring of the resin anchoring agent is achieved, which improves the safety of construction and efficiency.
Patent Information
- Application Number
- CN202421382565.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-17
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-06-17
AI Technical Summary
During the construction process, the resin anchor rods are difficult to deliver the resin rolls in place due to poor guiding properties and high friction during the resin anchor rods, and the resin anchoring agent is not fully mixed, resulting in poor anchoring force and safety hazards.
A self-drilling resin high-stretching prestressed hollow anchor rod is designed to pierce the packaging of resin anchor agent through the spike, and the spiral reamer is used to make the resin anchor agent fully mixed and evenly during the propulsion process.
The resin anchoring agent is fully mixed evenly, the anchoring capacity is improved, and the safety and efficiency of construction are enhanced.
Smart Images
Figure CN222501785U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tunnel support, in particular to a screw-in prestressed anchor rod with a built-in anchoring agent. Background Art
[0002] At present, anchor support is usually used in the fields of geotechnical engineering, mining and tunneling. Commonly used anchors include resin anchors and mortar anchors. In tunnel support systems, resin anchors have the characteristics of short solidification time and fast force bearing, and are widely used.
[0003] The construction process of ordinary resin anchors is: (1) drilling an anchor hole, (2) feeding a resin roll into the anchor hole, (3) inserting the anchor rod, and (4) rotating the anchor rod to crush the resin roll, so that the resin roll is mixed and solidified before anchoring the anchor rod. In the second step, the resin roll is usually directly pushed into the bottom of the anchor hole by high-pressure water or high-pressure gas. However, during use, the resin roll is difficult to deliver because the axis of the anchor hole is not a standard straight line (i.e., the hole is not straight), the friction between the resin roll and the anchor hole is large, and the resin roll itself is soft and has poor guidance.
[0004] To solve the above problems, the prior art proposes a self-drilling, high-ductility prestressed hollow anchor rod with built-in resin. However, such resin anchor rods still have the following problems: since the resin anchoring agent is not fully mixed before extrusion, the anchoring force is poor, and the large deformation of the surrounding rock causes the anchor rod to fail, which may easily lead to safety hazards. Utility Model Content
[0005] The utility model aims to solve the deficiencies of the prior art and to provide a self-drilling high-ductility prestressed hollow anchor rod with built-in resin. By adopting this solution, the package of the resin anchor can be punctured by the sharp thorn part during the advancement process, and the resin anchor can be fully mixed and evenly mixed by the spiral concrete reamer during the advancement process.
[0006] The utility model is realized by the following technical solutions:
[0007] A screw-in prestressed anchor rod with a built-in anchoring agent, comprising:
[0008] An anchoring section rod body, wherein the anchoring section rod body has a through hole along its length direction, and a resin anchoring agent is placed inside the through hole;
[0009] A hollow anchor rod, wherein the outer diameter of the hollow anchor rod is matched with the inner diameter of the through hole;
[0010] An anchor head, the anchor head is fixed to one end of the anchoring section rod body, the one end of the anchor head extends into the interior of the anchoring section rod body, and the one end of the anchor head is provided with a spiral concrete reamer, the outer diameter of the spiral concrete reamer is adapted to the inner diameter of the through hole, and the end of the spiral concrete reamer facing the resin anchoring agent is provided with a spike portion;
[0011] The anchor head is provided with an overflow hole which is communicated with the interior of the anchoring section rod body.
[0012] Compared with the prior art, in which the resin anchor is not fully mixed before extrusion, resulting in poor anchoring force, and large deformation of the surrounding rock leads to anchor failure, which is prone to safety hazards. The utility model provides a self-drilling, high-ductility prestressed hollow anchor with built-in resin. By adopting this solution, the sharp thorn part can puncture the packaging of the resin anchor during the advancement process, and the spiral concrete reamer can be used to make the resin anchor fully mixed during the advancement process. The specific scheme includes an anchoring section rod body that can be extended into the soil. The anchoring rod body is pushed into the soil to reserve installation space for the hollow anchor rod and guide it. After the anchoring section rod body is fixed, the hollow anchor rod can be extended from the other end of the anchoring section rod body, so that the hollow anchor rod is gradually sent into the interior of the anchoring section rod body to achieve grouting. Since the anchoring section rod body contains resin anchoring agent, and the end of the anchor head extending into the anchoring section rod body is provided with a spiral concrete reamer, in this way, during the delivery process of the hollow anchor rod, the resin anchoring agent will be gradually squeezed, and finally the packaging of the resin anchoring agent will be punctured by the sharp thorn part, so that the resin and the anchoring agent are mixed with each other. In the prior art, the packaging rolls of resin anchors are all punctured from the front end, which results in the inability to fully mix the resin and the anchor. In this solution, a spike portion is provided at the rear end of the resin anchor, thereby puncturing the rear end of the packaging roll of the resin anchor. In this way, after puncturing, as the hollow anchor gradually squeezes the liquid, the liquid enters the spiral channel on the spiral concrete reamer, causing the liquid to flow in a spiral pattern, thereby achieving full mixing of the resin and the anchor. Of course, the diameter of the spiral concrete reamer may also be slightly smaller than the inner diameter of the through hole; when the fully mixed liquid passes through the spiral concrete reamer, it will be squeezed into the overflow hole of the anchor head and discharged through the overflow hole to achieve initial anchoring. Therefore, the above solution can achieve full and uniform mixing of the resin and the anchor by puncturing the rear end and by squeezing and the spiral channel on the spiral concrete reamer, thereby improving the anchoring capacity.
[0013] In order to further achieve uniform anchoring of the external resin anchoring agent, the outer wall of the hollow anchor rod has an external thread, and the inner side of the anchoring section rod body has an internal thread that matches the external thread. In this solution, the hollow anchor rod and the anchoring section rod body are threadedly connected, so that the hollow anchor rod is initially fixed inside the soil body, and can be screwed into the hollow anchor rod through the threaded connection. After the hollow anchor rod is screwed into the bottom, that is, when the inside is against the spike part, the hollow anchor rod cannot rotate relative to the anchoring section rod body. When the hollow anchor rod is driven to rotate again, the anchor rod body can be driven to rotate synchronously. When the anchor rod body rotates, the external mixed liquid can be evenly stirred to make the external mixed liquid evenly distributed, so as to further improve the anchoring ability.
[0014] In order to realize the quick connection between the hollow anchor rod and the anchoring section rod body, a corrugated threaded tube is coaxially fixed to the inner side of the other end of the anchoring section rod body, and the anchoring section rod body is threadedly connected to the hollow anchor rod through the corrugated threaded tube. In this scheme, only one section of corrugated thread is arranged in the anchoring section rod body, which can realize the quick connection with the hollow anchor rod while making the middle pipe section a straight section, so that the plug, that is, the ball, can slide on the straight section to prevent sliding jam and improve the sealing performance; in addition, a corrugated threaded tube is arranged inside the other end of the anchoring section rod body to block the plug for limiting the position and prevent the plug, that is, the ball, from falling off.
[0015] In order to improve the connection strength, the corrugated threaded tube and the inner side of the other end of the anchoring section rod body are welded.
[0016] In order to prevent the resin anchor from flowing back and blocking the slurry outlet hole, a plug is also included. The plug is placed inside the through hole and is sealingly and slidably connected to the through hole. The plug can move along the length direction of the anchoring section rod body; the resin anchor is located between the anchor head and the plug. In this solution, the other end of the anchoring section rod body is sealed by the plug, so that during the advancement of the hollow anchor rod, while the resin anchor is squeezed through the plug, the resin anchor can be prevented from flowing back and causing the slurry outlet hole to be blocked.
[0017] In order to avoid jamming during advancement, which would result in difficulty in advancing the hollow anchor rod, the plug is a sphere, and the outer diameter of the sphere is matched to the inner diameter of the through hole.
[0018] In order to keep the anchoring section rod body still when the hollow anchor rod is screwed in, the other end of the anchor head outside the anchoring section rod body is in the shape of a cross screwdriver. In this solution, the front end is in the shape of a cross screwdriver, which can push away the broken soil caused by the collapsed hole during the anchor rod advancement process. After the hollow anchor rod is advanced into place, the anchoring section rod body can be fixed to remain still when the hollow anchor rod continues to be advanced and rotated to push out the resin anchoring agent.
[0019] In order to realize grouting of the hollow anchor rod, the other end of the anchoring section rod body is also provided with a grout outlet hole.
[0020] As a redundant solution, the end of the hollow anchor rod away from the anchoring section rod body is provided with a grout stopper, and a pad is fixed at the grout stopper.
[0021] As a redundant solution, a spherical gasket and a nut are also sleeved on the hollow anchor rod, and the nut and the hollow anchor rod are threadedly connected; the spherical gasket is located between the pad and the nut, and the raised part of the spherical gasket and the center hole of the raised part of the pad are relatively tightly arranged.
[0022] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0023] 1. The utility model provides a self-drilling high-ductility prestressed hollow anchor rod with built-in resin. By adopting this scheme, when the spiral concrete reamer rotates in the hollow anchor rod to push the sphere that prevents the anchor from flowing back, the packaging of the resin anchor can be punctured, and the resin anchor can be fully and evenly mixed. The evenly mixed resin anchor passes through the overflow hole and enters the anchor hole, thereby achieving the effect of rapid anchoring. The operation is convenient and safe, the construction efficiency is high, the construction quality is reliable, and the comprehensive benefits are remarkable.
[0024] 2. The utility model provides a self-drilling high-ductility prestressed hollow anchor rod with built-in resin. According to this solution, the hollow anchor rod and the anchoring section rod body are threadedly connected, so that the hollow anchor rod is initially fixed inside the soil body and can be screwed into the hollow anchor rod through the threaded connection. After the hollow anchor rod is screwed in to the bottom, that is, when the inside is against the spike part, the hollow anchor rod cannot rotate relative to the anchoring section rod body. When the hollow anchor rod is driven to rotate again, the anchor rod body can be driven to rotate synchronously. When the anchor rod body rotates, the external mixed liquid can be evenly stirred to make the external mixed liquid evenly distributed, so as to further improve the anchoring ability.
[0025] 3. The utility model provides a self-drilling high-ductility prestressed hollow anchor rod with built-in resin. By adopting this solution, only a section of corrugated thread is arranged in the rod body of the anchoring section. While realizing quick connection with the hollow anchor rod, the middle pipe section can also be made into a straight section. In this way, the plug, that is, the ball, can slide on the straight section to prevent sliding jams and improve sealing performance. In addition, a corrugated threaded tube is arranged inside the other end of the rod body of the anchoring section to block the plug for limiting the position and prevent the plug, that is, the ball, from falling off.
[0026] 4. The utility model provides a self-drilling, high-ductility prestressed hollow anchor rod with built-in resin. By adopting this solution, the other end of the anchoring section rod body is sealed by a plug, that is, a sphere. During the advancement of the hollow anchor rod, while the resin anchor agent is squeezed by the sphere, it can also prevent the resin anchor agent from flowing back and causing blockage of the slurry outlet hole. In addition, the spherical design can avoid sliding jams that cause difficulties in advancing the prestressed hollow anchor rod. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:
[0028] Figure 1 The utility model provides a structural schematic diagram of a high-ductility prestressed hollow anchor rod.
[0029] Marks and corresponding parts names in the attached drawings:
[0030] 1- spiral reamer anchor head, 2- anchoring section rod body, 3- resin anchor, 4- plug, 5- corrugated threaded pipe, 6- hollow anchor rod, 7- slurry stopper, 8- pad, 9- spherical gasket, 10- nut. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.
[0032] Example:
[0033] This embodiment provides a screw-in prestressed anchor rod with a built-in anchoring agent, such as Figure 1 As shown, including:
[0034] An anchoring section rod body 2, wherein the anchoring section rod body 2 has a through hole along its length direction, and a resin anchoring agent 3 is placed inside the through hole;
[0035] A hollow anchor rod 6, the outer diameter of the hollow anchor rod 6 is adapted to the inner diameter of the through hole;
[0036] An anchor head 1, wherein the anchor head 1 is fixed to one end of the anchoring section rod body 2, the one end of the anchor head 1 extends into the interior of the anchoring section rod body 2, and the one end of the anchor head 1 is provided with a spiral concrete reamer, the outer diameter of the spiral concrete reamer is adapted to the inner diameter of the through hole, and the end of the spiral concrete reamer facing the resin anchor 3 is provided with a spike portion;
[0037] The anchor head 1 is provided with an overflow hole which is communicated with the interior of the anchoring section rod body 2 .
[0038] Compared with the prior art, in which the resin anchor 3 is not fully mixed before extrusion, resulting in poor anchoring force, and large deformation of the surrounding rock leads to anchor failure, which is prone to safety hazards. The utility model provides a self-drilling, high-ductility prestressed hollow anchor 6 with built-in resin. By adopting this solution, the sharp thorn part can puncture the packaging of the resin anchor 3 during the advancement process, and the spiral concrete reamer can also be used to make the resin anchor 3 fully mixed during the advancement process. The specific scheme includes an anchoring section rod body 2 that can be extended into the soil. The anchoring rod body is pushed into the soil to reserve installation space for the hollow anchor rod 6 and guide it. After the anchoring section rod body 2 is fixed, the hollow anchor rod 6 can be extended from the other end of the anchoring section rod body 2, so that the hollow anchor rod 6 is gradually sent into the interior of the anchoring section rod body 2 to achieve grouting. Since the anchoring section rod body 2 contains resin anchoring agent 3, and the end of the anchor head 1 extending into the anchoring section rod body 2 is provided with a spiral concrete reamer, in this way, during the delivery process of the hollow anchor rod 6, the resin anchoring agent 3 will be gradually squeezed, and finally the packaging of the resin anchoring agent 3 will be punctured by the sharp thorn part, so that the resin and the anchoring agent are mutually fixed. Mixing; Since the packaged rolls of the resin anchor 3 in the prior art are all punctured from the front end, the resin and the anchor cannot be fully mixed. However, in this solution, a spike portion is provided at the rear end of the resin anchor 3, thereby puncturing the rear end of the packaged roll of the resin anchor 3. In this way, after puncturing, as the hollow anchor rod 6 gradually squeezes the liquid, the liquid enters the spiral channel on the spiral concrete reamer, causing the liquid to flow in a spiral shape, thereby achieving full mixing of the resin and the anchor. Of course, the diameter of the spiral concrete reamer may also be slightly smaller than the inner diameter of the through hole; when the fully mixed liquid passes through the spiral concrete reamer, it will be squeezed into the overflow hole of the anchor head 1 and discharged through the overflow hole to achieve initial anchoring. Therefore, the above solution can achieve full and uniform mixing of the resin and the anchor by puncturing the rear end, and by squeezing and the spiral channel on the spiral concrete reamer, thereby improving the anchoring ability.
[0039] In order to further realize the uniform anchoring of the external resin anchor 3, the outer wall of the hollow anchor rod 6 has an external thread, and the inner side of the anchoring section rod body 2 has an internal thread that matches the external thread. In this scheme, the hollow anchor rod 6 and the anchoring section rod body 2 are threadedly connected, so that the hollow anchor rod 6 is initially fixed inside the soil body, and can be screwed into the hollow anchor rod 6 through the threaded connection. After the hollow anchor rod 6 is screwed into the bottom, that is, when the inside is against the spike part, the hollow anchor rod 6 cannot rotate relative to the anchoring section rod body 2. When the hollow anchor rod 6 is driven to rotate again, the anchor rod body can be driven to rotate synchronously. When the anchor rod body rotates, the external mixed liquid can be evenly stirred to make the external mixed liquid evenly distributed, so as to further improve the anchoring ability.
[0040] In order to realize the quick connection between the hollow anchor rod 6 and the anchoring section rod body 2, a corrugated threaded tube 5 is coaxially fixed to the inner side of the other end of the anchoring section rod body 2, and the anchoring section rod body 2 is threadedly connected to the hollow anchor rod 6 through the corrugated threaded tube 5. In this scheme, only one section of corrugated thread is arranged inside the anchoring section rod body 2, which can realize the quick connection with the hollow anchor rod 6 and make the middle pipe section a straight section, so that the plug 4, that is, the ball, can slide on the straight section to prevent sliding jam and improve the sealing performance; in addition, the corrugated threaded tube 5 is arranged inside the other end of the anchoring section rod body 2 to block the plug 4 for limiting the position and prevent the plug 4, that is, the ball, from falling off.
[0041] In order to improve the connection strength, the corrugated threaded tube 5 and the inner side of the other end of the anchoring section rod body 2 are welded.
[0042] In order to prevent the resin anchor 3 from flowing back and blocking the slurry outlet hole, a plug 4 is also included. The plug 4 is placed inside the through hole and is sealed and slidably connected to the through hole. The plug 4 can move along the length direction of the anchoring section rod body 2; the resin anchor 3 is located between the anchor head 1 and the plug 4. In this solution, the other end of the anchoring section rod body 2 is sealed by the plug 4, so that during the advancement of the hollow anchor rod 6, while the resin anchor 3 is squeezed by the plug 4, the resin anchor 3 can be prevented from flowing back and causing the slurry outlet hole to be blocked.
[0043] In order to avoid the hollow anchor rod 6 being stuck during advancement, which results in difficulty in advancing, the plug 4 is a sphere, and the outer diameter of the sphere is matched to the inner diameter of the through hole.
[0044] In order to keep the anchoring section rod body 2 still when the hollow anchor rod 6 is screwed in, the other end of the anchor head 1 outside the anchoring section rod body 2 is in the shape of a cross screwdriver. In this solution, the front end is in the shape of a cross screwdriver, which can push away the broken soil caused by the collapsed hole during the anchor rod advancement process. After the hollow anchor rod 6 is advanced into place, the anchoring section rod body 2 can be fixed to remain still when the hollow anchor rod 6 continues to be advanced and rotated to push out the resin anchoring agent 3.
[0045] In order to realize grouting of the hollow anchor rod 6, the other end of the anchoring section rod body 2 is also provided with a grout outlet hole.
[0046] As a redundant solution, the end of the hollow anchor rod 6 away from the anchoring section rod body 2 is provided with a grout stopper 7, and a pad 8 is fixed to the grout stopper 7.
[0047] As a redundant solution, a spherical gasket 9 and a nut 10 are also sleeved on the hollow anchor rod 6, and the nut 10 is threadedly connected to the hollow anchor rod 6; the spherical gasket 9 is located between the pad 8 and the nut 10, and the raised part of the spherical gasket 9 and the center hole of the raised part of the pad 8 are relatively tightly arranged.
[0048] The anchoring section accessories and medicine rolls are all equipped by the manufacturer. At the construction site, the construction can be completed by simply screwing the high-ductility prestressed hollow anchor rod 6 into the thread of the threaded transition piece.
[0049] The anchoring section, high ductility prestressed hollow anchor rod 6, and all accessories adopt standard corrugated threads to meet the universal requirements of mechanical construction. The hollow anchor rod 6 adopts high ductility prestressed hollow anchor rod 6. When the rock formation is deformed, expanded, the regional rock mass is broken, and the joints and fissures develop, the total elongation of the maximum force of the anchor rod is not less than 12%. When the deformation of the anchor rod is less than 12%, the anchor rod will not fail, the safety and stability are improved, the anchoring effectiveness is high, and the potential safety hazards are reduced.
[0050] Specific working principle:
[0051] After drilling, the anchoring section rod body 2 is pushed into the soil. The front end of the anchor head 1 is in the shape of a cross screwdriver, which can push away the broken soil caused by the collapse of the hole during the advancement of the entire anchor rod; when the anchoring section rod body 2 is pushed to the specified position, the hollow anchor rod 6 is then screwed in, and the hollow anchor rod 6 is gradually sent into the interior of the anchoring section rod body 2, and the plug 4 is pushed to move, so that the plug 4 squeezes the resin anchor 3, and finally punctures the packaging of the resin anchor 3 through the sharp thorn part, so that the resin and the anchor are mixed with each other; as the hollow anchor 6 gradually squeezes the liquid, the liquid enters the spiral channel on the spiral concrete reamer, so that the liquid flows in a spiral and turbulence occurs, thereby achieving full mixing of the resin and the anchor; when the fully mixed liquid passes through the spiral concrete reamer, it will be squeezed into the overflow hole of the anchor head 1 and discharged through the overflow hole to achieve initial anchoring.
[0052] When the plug 4, that is, the ball, is against the spiked part, the hollow anchor rod 6 cannot rotate relative to the anchor section rod body 2. When the hollow anchor rod 6 is driven to rotate again, the anchor rod body can be driven to rotate synchronously. When the anchor rod body rotates, the external mixed liquid can be evenly stirred to make the external mixed liquid evenly distributed, so as to further improve the anchoring ability.
[0053] Finally, grouting is performed through the hollow anchor rod 6 to complete the support.
[0054] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.
Claims
1. A screw-in prestressed anchor with a built-in anchoring agent, characterized in that: include: An anchoring section rod body (2), the anchoring section rod body (2) having a through hole extending along its length direction, and a resin anchoring agent (3) is placed inside the through hole; A hollow anchor rod (6), the outer diameter of the hollow anchor rod (6) being compatible with the inner diameter of the through hole; An anchor head (1), the anchor head (1) being fixed to one end of the anchoring section rod body (2), the one end of the anchor head (1) extending into the interior of the anchoring section rod body (2), and the one end of the anchor head (1) being provided with a spiral concrete reamer, the outer diameter of the spiral concrete reamer being adapted to the inner diameter of the through hole, and the end of the spiral concrete reamer facing the resin anchoring agent (3) being provided with a spike portion; The anchor head (1) is provided with an overflow hole which is in communication with the interior of the anchoring section rod body (2).
2. A screw-in prestressed anchor rod with built-in anchoring agent according to claim 1, characterized in that: The outer wall of the hollow anchor rod (6) is provided with an external thread, and the inner side of the anchoring section rod body (2) is provided with an internal thread matching the external thread.
3. A screw-in prestressed anchor rod with built-in anchoring agent according to claim 2, characterized in that: A corrugated threaded tube (5) is coaxially fixed to the inner side of the other end of the anchoring section rod body (2), and the anchoring section rod body (2) is threadedly connected to the hollow anchor rod (6) via the corrugated threaded tube (5).
4. The screw-in prestressed anchor rod with built-in anchoring agent according to claim 3, characterized in that: The corrugated threaded tube (5) is welded to the inner side of the other end of the anchoring section rod body (2).
5. A screw-in prestressed anchor rod with built-in anchoring agent according to any one of claims 2 to 4, characterized in that: It also includes a plug (4), which is placed inside the through hole and is sealingly and slidably connected to the through hole, and the plug (4) can move along the length direction of the anchoring section rod body (2); the resin anchoring agent (3) is located between the anchor head (1) and the plug (4).
6. The screw-in prestressed anchor rod with built-in anchoring agent according to claim 5, characterized in that: The plug (4) is a sphere, and the outer diameter of the sphere is matched to the inner diameter of the through hole.
7. The screw-in prestressed anchor rod with built-in anchoring agent according to claim 1, characterized in that: The other end of the anchor head (1) located outside the anchoring section rod body (2) is in the shape of a cross screwdriver.
8. The screw-in prestressed anchor rod with built-in anchoring agent according to claim 1, characterized in that: The other end of the anchoring section rod body (2) is also provided with a slurry outlet hole.
9. The screw-in prestressed anchor rod with built-in anchoring agent according to claim 1, characterized in that: The end of the hollow anchor rod (6) away from the anchoring section rod body (2) is provided with a grout stopper (7), and a pad (8) is fixed to the grout stopper (7).
10. The screw-in prestressed anchor rod with built-in anchoring agent according to claim 9, characterized in that: The hollow anchor rod (6) is also sleeved with a spherical gasket (9) and a nut (10), and the nut (10) and the hollow anchor rod (6) are threadedly connected; the spherical gasket (9) is located between the pad (8) and the nut (10), and the raised portion of the spherical gasket (9) and the center hole of the raised portion of the pad (8) are relatively tightly arranged.