Self-expanding pre-tightening hollow grouting anchor rod and anchoring method thereof

Abstract

The invention relates to the field of rock mass anchoring, in particular to a self-expansion type pre-tightening hollow grouting anchor rod and an anchoring method thereof.The self-expansion type pre-tightening hollow grouting anchor rod comprises a hollow rod body, the front section of the hollow rod body is an expansion section with a cross-shaped open groove in the end face, and a fixing stud is fixed to the position, located at the tail end of the expansion section, in the hollow rod body; a lengthened inner hexagon bolt penetrates into the hollow rod body, the lengthened inner hexagon bolt penetrates through the fixing stud and is in threaded fit with the fixing stud, the first end, provided with an inner hexagon notch, of the lengthened inner hexagon bolt is arranged in the hollow rod body, and a conical expansion stud is arranged at the second end of the lengthened inner hexagon bolt. The conical surface in the conical expansion stud abuts against the front end opening of the hollow rod body; in the anchoring installation process, the periphery of the part, arranged on the inner side of the anchoring hole, of the hollow rod body is provided with a large-pitch thread and a grouting hole, the periphery of the part, arranged on the outer side of the anchoring hole, of the hollow rod body is provided with a fine-pitch thread, and the fine-pitch thread is provided with a grouting plugging assembly. And the functions of high-strength rod body, high-pre-tightening installation, grouting and self-expansion anchoring are achieved at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of rock mass anchoring, in particular to a self-expanding pre-tightened hollow grouting anchor rod and an anchoring method thereof. Background Art

[0002] In rock anchoring and grouting projects, external support anchors and grouting anchors are often used and operated separately. The support anchors are often made of solid threaded steel and anchored with resin coils, and do not have the function of self-expansion mechanical anchoring; while the grouting anchors are made of thin-walled, low-strength, high-frequency welded pipes, which basically have no support strength and are mainly used for grouting. In specific implementation, the existing method requires drilling anchor holes on both sides, consuming two types of anchor materials, with low construction efficiency and large equipment and manpower occupation.

[0003] Based on this, some people use thick-walled seamless steel pipes to be hot-rolled to form full-length long-pitch hollow grouting anchor rods. Although they have high strength and are comparable to the strength of solid threaded steel anchor rods, they cannot achieve the high preload function well due to the large pitch of the rod tail and the low installation preload force. In addition, there is also a method of using a single split expansion head at the front section for mechanical anchoring. The connecting nut is buckled on the outer diameter surface of the hollow grouting anchor rod, so a larger installation hole is required, resulting in low drilling efficiency, and cannot meet the three-diameter matching requirements of resin coil anchoring, and cannot achieve combined mechanical and coil anchoring. Summary of the invention

[0004] In view of the above problems, an embodiment of the present invention provides a self-expanding pre-tightened hollow grouting anchor and an anchoring method thereof.

[0005] One aspect of the implementation of the present invention provides a self-expanding pre-tightened hollow grouting anchor rod, including a hollow rod body, the front section of the hollow rod body is an expansion section with a cross groove on the end face, a fixing stud is fixed in the hollow rod body and at the tail end of the expansion section; an extended hexagon socket bolt is inserted into the hollow rod body, the extended hexagon socket bolt passes through the fixing stud and cooperates with the fixing stud thread, the first end of the extended hexagon socket bolt with a hexagon socket notch is placed in the hollow rod body, the second end of the extended hexagon socket bolt is provided with a conical expansion stud, and the conical surface of the conical expansion stud is abutted against the front end of the hollow rod body; during the anchoring installation process, the outer periphery of the hollow rod body placed on the inner side of the anchor hole is provided with a large pitch thread and a grouting hole, and the outer periphery of the outer side of the anchor hole is provided with a fine pitch small pitch thread, and a grouting sealing component is provided on the fine pitch small pitch thread.

[0006] Compared with the prior art, the beneficial effects of the present invention are: the large pitch thread fits the grouting cement and resin roll to form a bonding anchor; the tapered expansion stud expands the expansion section to squeeze the anchor hole wall to form a mechanical anchor; when installing the grouting sealing component, the fine-pitch and small-pitch thread can increase the twisting preload required during installation, thereby having a high preload function; the set grouting hole can realize the integrated anchoring and grouting function; based on this, the hollow grouting anchor rod is realized with a high-strength rod body, high preload installation, grouting and self-expansion anchoring functions.

[0007] Optionally, the tapered expansion stud is threadedly sleeved on the lengthened hexagon socket bolt and is firmly welded to the lengthened hexagon socket bolt.

[0008] Optionally, a threaded hole is provided on the hollow rod body at a position opposite to the tail end of the expansion section, and a pin hole is provided on the outer side of the fixing stud opposite to the threaded hole; a set screw is installed in the threaded hole, and the end of the set screw is inserted into the pin hole.

[0009] Optionally, an adapter is provided on the fine-pitch and small-tip thread, the adapter includes a hollow anchor nut and a drill rod short section coaxially connected to the hollow anchor nut, the drill rod short section is used to connect to the drilling machine; the front end of the conical expansion stud is provided with a U-shaped blocking steel bar, the two ends of the blocking steel bar are in a pointed cone shape and face the outside of the conical expansion stud.

[0010] Optionally, a mounting rod adapted to the inner diameter of the hollow rod body is also included, and hexagonal wrenches are coaxially arranged at both ends of the mounting rod, and the hexagonal wrenches are adapted to the hexagonal notches in the extended hexagonal bolts.

[0011] Optionally, the grouting plugging assembly includes a grouting plug disposed between the anchor hole and the hollow rod body, a tray located outside the grouting plug, and a nut located outside the tray and threadedly connected to the fine-pitch and small-screw thread.

[0012] Another aspect of the present invention provides an anchoring method using the self-expanding pre-tightened hollow grouting anchor rod, comprising: S1. Determine the length and diameter of the anchor hole in the area to be anchored and grouting, and select a hollow grouting anchor rod of appropriate length according to the length and diameter of the anchor hole and the grouting design requirements; S2. Use drilling machinery to drill the anchor hole to the designed depth in the area to be anchored and grouted, and flush the hole wall with drill pipe water to keep the hole wall clean; S3, inserting the hollow grouting anchor rod into the anchor hole, rotating the hollow rod body and the extended hexagon socket bolt relative to each other so that the conical expansion stud is rotated and wedged into the expansion section of the hollow rod body, expanding the cross slot on the end face of the expansion section and squeezing the hole wall to achieve anchoring; S4. Install the grouting plugging assembly on the fine-pitch and small-pitch threads of the hollow rod body; S5. Connect a grouting pipe to the tail end of the hollow rod body to perform grouting of the hole wall space and the fractured rock mass, and the grouting material is ordinary cement slurry, special cement slurry or polyurethane slurry; S6. Grouting is completed and the grouting pipe is removed.

[0013] Optionally, for the condition that it is difficult to work manually standing on the top, a hollow grouting anchor with blocking steel bars and an adapter is selected. Accordingly, S3 specifically includes: S311, screw the adapter into the fine-pitch thread at the end of the hollow rod; S312. Insert the hollow grouting anchor rod together with the adapter into the anchor hole, and connect the adapter outside the hole to the punching machine. Push the hollow grouting anchor rod through the punching machine so that the blocking steel bar is nailed into the bottom of the hole. After that, the hollow rod body is twisted through the adapter by the punching machine. The expansion section of the hollow rod body is inserted into the conical expansion stud. The conical expansion stud expands the cross groove on the end face of the expansion section and squeezes the hole wall to achieve anchoring.

[0014] Optionally, S312 also includes: before inserting the hollow grouting anchor rod together with the adapter into the anchor hole, inserting a predetermined resin roll into the anchor hole, and accordingly, the hollow grouting anchor rod is pushed by the punching machine while driving the hollow grouting anchor rod to twist, so that the hollow grouting anchor rod is pushed in while twisting and the resin roll is stirred, and after the stuck steel bar is nailed into the bottom of the hole, the conical expansion stud expands the end face cross groove in the expansion section and squeezes the hole wall to complete the mechanical anchoring, and at the same time the resin roll is cured to complete the resin bonding anchoring.

[0015] Optionally, for conditions suitable for manual standing work, a hollow grouting anchor with a mounting rod is selected, and accordingly, S3 specifically includes: S321, inserting the mounting rod into the hollow rod body, and inserting the hexagonal wrench at the end of the mounting rod into the hexagonal notch of the extended hexagonal bolt; S322, inserting the hollow grouting anchor rod together with the mounting rod into the anchor hole until the bottom of the hole; S323. Use a pneumatic wrench to connect the hexagonal wrench at the other end of the installation rod, start the pneumatic wrench to drive the extended hexagonal bolt to twist through the installation rod, and finally drive the conical expansion stud to rotate and wedge into the expansion section of the hollow rod body, expand the end face cross slot in the expansion section and squeeze the hole wall to achieve anchoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings: Figure 1 A schematic structural diagram of a first self-expanding pre-tightened hollow grouting anchor provided by an embodiment of the present invention; Figure 2A schematic structural diagram of a second self-expanding pre-tightened hollow grouting anchor provided by an embodiment of the present invention; Figure 3 A schematic structural diagram of a hollow rod body provided in an embodiment of the present invention; Figure 4 A schematic diagram of the structure of the lengthened hexagon socket bolt portion provided in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of an adapter provided by an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a steel bar blocking device provided by an embodiment of the present invention; Figure 7 A schematic structural diagram of a mounting rod portion provided by an embodiment of the present invention; Figure 8 A schematic diagram of the anchoring effect of the first self-expanding pre-tightened hollow grouting anchor provided by an embodiment of the present invention; Fig. 9 A schematic diagram of the anchoring effect of the second self-expanding pre-tightened hollow grouting anchor provided in an embodiment of the present invention.

[0017] Among them, 1. Hollow rod body; 2. Fixing stud; 3. Extended hexagon socket bolt; 4. Conical expansion stud; 5. Anchor hole; 6. Large pitch thread; 7. Grouting hole; 8. Fine pitch thread; 9. Long groove; 10. Threaded hole; 11. Set screw; 12. Hollow anchor nut; 13. Drill rod pup section; 14. Blocking steel bar; 15. Mounting rod; 16. Hexagonal wrench; 17. Connecting screw; 18. Grouting plug; 19. Tray; 20. Nut. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0019] See also Figure 1-Figure 9A self-expanding pre-tightened hollow grouting anchor rod provided in an embodiment of the present invention comprises a hollow rod body 1, the front section of the hollow rod body 1 is an expansion section provided with a cross groove on the end face, a fixing stud 2 is fixed in the hollow rod body 1 and at the tail end of the expansion section; an extended hexagon socket bolt 3 is inserted into the hollow rod body 1, the extended hexagon socket bolt 3 passes through the fixing stud 2 and is threadedly matched with the fixing stud 2, the first end of the extended hexagon socket bolt 3 with the hexagon socket notch is placed in the hollow rod body 1, the second end of the extended hexagon socket bolt 3 is provided with a conical expansion stud 4, and the conical surface of the conical expansion stud 4 is against the front end of the hollow rod body 1; during the anchoring installation process, the outer periphery of the inner part of the hollow rod body 1 placed in the anchor hole 5 is provided with a large pitch thread 6 and a grouting hole 7, and the outer periphery of the outer part of the anchor hole 5 is provided with a fine pitch small pitch thread 8, and a grouting plugging component is provided on the fine pitch small pitch thread 8.

[0020] During implementation, the hollow rod body 1 is processed by hot rolling of thick-walled seamless steel pipe, and the tensile strength of the rod body is greater than 100kN, which is equivalent to the solid threaded steel anchor, so it has a high preload function; the size of the large pitch thread 6 can be designed according to the actual construction requirements, that is, it can meet the high-strength anchoring requirements of grouting cement and resin medicine rolls; the size of the fine-pitch small pitch thread 8 is designed according to the actual construction requirements, that is, it can achieve better support function for the preloaded tray, so it has a high preload function; grouting holes 7 are opened on the hollow rod body 1 at a spacing of 400-600mm to realize the integrated anchoring and grouting function; the cross groove on the end face of the expansion section is to open a long groove 9 on the hollow rod body 1 along the axial direction of the hollow rod body 1, and a total of four long grooves 9 are opened and two of them are opposite to each other to form a cross shape.

[0021] The conical expansion stud 4, the extended hexagon socket bolt 3 and the fixed stud 2 have the same thread specifications and constitute the internal expansion core structure; the conical expansion stud 4 is threadedly sleeved on the extended hexagon socket bolt 3 and is firmly welded to the extended hexagon socket bolt 3; the extended hexagon socket bolt 3 is a cylindrical head hexagon socket bolt, which is longer than the standard length to adapt to the length of the expansion section. When inserting into the hollow rod body 1, the extended hexagon socket bolt 3 can be inserted from the rear end of the hollow rod body 1 and then threadedly connected with the fixed stud 2, and the end of the screw part passes through the front end of the hollow rod body 1.

[0022] A threaded hole 10 is provided on the hollow rod body 1 at a position opposite to the tail end of the expansion section, and a pin hole is provided on the outer side of the fixing stud 2 opposite to the threaded hole 10; a set screw 11 is installed in the threaded hole 10, and the end of the set screw 11 is inserted into the pin hole; the installation firmness of the fixing stud 2 is enhanced.

[0023] An adapter is provided on the fine-pitch thread 8, which includes a hollow anchor nut 12 and a drill rod short section 13 coaxially connected to the hollow anchor nut 12, and the drill rod short section 13 is used to connect to the drilling machine; the front end of the conical expansion stud 4 is provided with a U-shaped blocking steel bar 14, and the two ends of the blocking steel bar 14 are in a pointed cone shape and face the outside of the conical expansion stud 4.

[0024] The hollow grouting anchor rod also includes a mounting rod 15 adapted to the inner diameter of the hollow rod body 1, and hexagonal wrenches 16 are coaxially arranged at both ends of the mounting rod 15, and the hexagonal wrenches 16 are adapted to the hexagonal notches in the extended hexagonal bolts 3; in specific implementation, the mounting rod 15 can adopt a segmented structure, and the segments are coaxially threaded to achieve lengthening to adapt to hollow rod bodies 1 of different lengths; if the mounting rod 15 also adopts a hollow rod body, internal threads are arranged on the inner walls at both ends of the mounting rod 15, and the connection between the two rod bodies is achieved by connecting screws 17.

[0025] The grouting sealing assembly includes a grouting plug 18 arranged between the anchor hole 5 and the hollow rod body 1, a tray 19 located outside the grouting plug 18, and a nut 20 located outside the tray 19 and screwed to the fine-pitch small-pitch thread 8. When the pre-tightening torque of the nut 20 is 300-400Nm during installation, the installation pre-tightening force can reach the high pre-tightening requirement of 30-40kN. At this time, the grouting pipe can be connected for rock grouting.

[0026] Another aspect of the present invention provides an anchoring method using the self-expanding pre-tightened hollow grouting anchor rod, comprising: S1. Determine the length and diameter of the anchor hole 5 in the area to be anchored and grouting, and select a hollow grouting anchor rod of appropriate length according to the length and diameter of the anchor hole 5 and the grouting design requirements; S2. Use a drilling machine to drill the anchor hole 5 to the designed depth in the area to be anchored and grouted, and flush the hole wall with drill pipe water to keep the hole wall clean; S3, insert the hollow grouting anchor rod into the anchor hole, rotate the hollow rod body 1 and the lengthened hexagon socket bolt 3 relative to each other so that the conical expansion stud 4 rotates and wedges into the expansion section of the hollow rod body 1, expands the cross slot on the end face of the expansion section and squeezes the hole wall to achieve anchoring; S4, installing a grouting plugging assembly on the fine-pitch and small-pitch thread 8 of the hollow rod body 1; S5. Connect a grouting pipe to the tail end of the hollow rod 1 to perform grouting of the hole wall space and the fractured rock mass, and the grouting material is ordinary cement slurry, special cement slurry or polyurethane slurry; S6. Grouting is completed and the grouting pipe is removed.

[0027] In the implementation, in view of the condition that it is difficult to work manually standing on the top, a hollow grouting anchor with a blocking steel bar 14 and an adapter is selected. Accordingly, S3 specifically includes: S311, screwing the adapter into the fine-pitch thread 8 at the rear end of the hollow rod body 1; S312. Insert the hollow grouting anchor rod together with the adapter into the anchor hole 5, and the adapter outside the hole is connected to a drilling machine, such as a drilling rig or a rock drill. The drilling machine is used to push the hollow grouting anchor rod so that the blocking steel bar 14 is nailed into the bottom of the hole. Thereafter, the drilling machine is used to twist the hollow rod body 1 through the adapter, and the expansion section of the hollow rod body 1 is inserted into the conical expansion stud 4. The conical expansion stud 4 expands the end face cross groove in the expansion section and squeezes the hole wall to achieve anchoring.

[0028] During implementation, S312 also includes: before inserting the hollow grouting anchor rod together with the adapter into the anchor hole 5, inserting a predetermined resin roll into the anchor hole 5, and accordingly, the hollow grouting anchor rod is pushed by the punching machine while driving the hollow grouting anchor rod to twist, so as to push the hollow grouting anchor rod while twisting and pushing it in to complete the pushing of the hollow grouting anchor rod and the stirring of the resin roll. After the blocking steel bar 14 is nailed into the bottom of the hole, the conical expansion stud 4 expands the end face cross groove in the expansion section and squeezes the hole wall to complete the mechanical anchoring, and at the same time the resin roll is cured to complete the resin bonding anchoring; that is, the expansion gap in the front section is filled with solidified resin to form a solid cone head composed of a thick rod body tube wall and resin. In addition to conventional bonding anchoring and friction anchoring, the blocking resistance between the rod body and the resin can be further increased, thereby playing a role in pressure anchoring on the hole wall.

[0029] In the implementation, according to the suitable conditions for manual standing operation, a hollow grouting anchor with a mounting rod 15 is selected, and accordingly, S3 specifically includes: S321, inserting the mounting rod 15 into the hollow rod body 1, and inserting the hexagonal wrench 16 at the end of the mounting rod 15 into the hexagonal notch of the lengthened hexagonal socket bolt 3; S322, inserting the hollow grouting anchor rod together with the mounting rod 15 into the anchor hole 5 until the bottom of the hole; S323. Use a pneumatic wrench to connect the hexagonal wrench 16 at the other end of the mounting rod 15, start the pneumatic wrench to drive the extended hexagonal bolt 3 to twist through the mounting rod 15, and finally drive the conical expansion stud 4 to rotate and wedge into the expansion section of the hollow rod body 1, expand the end face cross slot in the expansion section and squeeze the hole wall to achieve anchoring.

[0030] The solution provided by the present invention is that the large pitch thread fits the grouting cement and the resin roll to form a bonding anchor; the tapered expansion stud expands the expansion section to squeeze the anchor hole wall to form a mechanical anchor; when installing the grouting plugging component, the fine-pitch and small-pitch thread can increase the screwing and pressing preload force required during installation, thereby having a high preload function; the set grouting hole can realize the integrated anchoring and grouting function; based on this, the hollow grouting anchor rod is realized with a high-strength rod body, high preload installation, grouting and self-expansion anchoring functions.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A self-expanding pre-tightened hollow grouting anchor rod, comprising a hollow rod body, characterized in that: The front section of the hollow rod body is an expansion section with a cross groove on the end face, and a fixing stud is fixed in the hollow rod body and at the tail end of the expansion section; an extended hexagon socket bolt is inserted into the hollow rod body, the extended hexagon socket bolt passes through the fixing stud and cooperates with the fixing stud thread, the first end of the extended hexagon socket bolt with a hexagonal notch is placed in the hollow rod body, and the second end of the extended hexagon socket bolt is provided with a conical expansion stud, and the conical surface in the conical expansion stud is abutted against the front end of the hollow rod body; during the anchoring installation process, the outer periphery of the hollow rod body placed on the inner side of the anchor hole is provided with a large pitch thread and a grouting hole, and the outer periphery of the outer side of the anchor hole is provided with a fine pitch small pitch thread, and a grouting sealing component is provided on the fine pitch small pitch thread.

2. The self-expanding pre-tightened hollow grouting anchor rod according to claim 1, characterized in that: The conical expansion stud is threadedly sleeved on the lengthened hexagon socket bolt and is firmly welded to the lengthened hexagon socket bolt.

3. The self-expanding pre-tightened hollow grouting anchor rod according to claim 1, characterized in that: A threaded hole is provided on the hollow rod body at a position corresponding to the tail end of the expansion section, and a pin hole is provided on the outer surface of the fixing stud corresponding to the threaded hole; a set screw is installed in the threaded hole, and the end of the set screw is inserted into the pin hole.

4. The self-expanding pre-tightened hollow grouting anchor rod according to claim 1, characterized in that: An adapter is provided on the fine-pitch and small-screw thread, which includes a hollow anchor nut and a drill rod short section coaxially connected to the hollow anchor nut, and the drill rod short section is used to connect to the drilling machine; a U-shaped blocking steel bar is provided at the front end of the tapered expansion stud, and both ends of the blocking steel bar are in a pointed cone shape and face the outside of the tapered expansion stud.

5. The self-expanding pre-tightened hollow grouting anchor rod according to claim 1, characterized in that: It also includes a mounting rod adapted to the inner diameter of the hollow rod body, and two ends of the mounting rod are coaxially provided with hexagonal wrenches, which are adapted to the hexagonal notches in the extended hexagonal bolts.

6. The self-expanding pre-tightened hollow grouting anchor as described in claim 1, the grouting sealing assembly includes a grouting plug arranged between the anchor hole and the hollow rod body, a tray located outside the grouting plug, and a nut located outside the tray and threadedly connected to the fine-pitch small-thread thread.

7. An anchoring method using any one of claim 16 self-expanding pre-tightened hollow grouting anchor rods, characterized in that: include: S1. Determine the length and diameter of the anchor hole in the area to be anchored and grouting, and select a hollow grouting anchor rod of appropriate length according to the length and diameter of the anchor hole and the grouting design requirements; S2. Use drilling machinery to drill the anchor hole to the designed depth in the area to be anchored and grouted, and flush the hole wall with drill pipe water to keep the hole wall clean; S3, inserting the hollow grouting anchor rod into the anchor hole, rotating the hollow rod body and the extended hexagon socket bolt relative to each other so that the conical expansion stud is rotated and wedged into the expansion section of the hollow rod body, expanding the cross slot on the end face of the expansion section and squeezing the hole wall to achieve anchoring; S4. Install the grouting plugging assembly on the fine-pitch and small-pitch threads of the hollow rod body; S5. Connect a grouting pipe to the tail end of the hollow rod body to perform grouting of the hole wall space and the fractured rock mass, and the grouting material is ordinary cement slurry, special cement slurry or polyurethane slurry; S6. Grouting is completed and the grouting pipe is removed.

8. The anchoring method according to claim 7, characterized in that: In view of the condition that it is difficult to work manually standing on the top, a hollow grouting anchor with blocking steel bars and adapters is selected. Accordingly, S3 specifically includes: S311, screw the adapter into the fine-pitch thread at the end of the hollow rod; S312. Insert the hollow grouting anchor rod together with the adapter into the anchor hole, and connect the adapter outside the hole to the punching machine. Push the hollow grouting anchor rod through the punching machine so that the blocking steel bar is nailed into the bottom of the hole. After that, the hollow rod body is twisted through the adapter by the punching machine. The expansion section of the hollow rod body is inserted into the conical expansion stud. The conical expansion stud expands the cross groove on the end face of the expansion section and squeezes the hole wall to achieve anchoring.

9. The anchoring method according to claim 8, characterized in that: S312 also includes: before inserting the hollow grouting anchor rod together with the adapter into the anchor hole, inserting a predetermined resin roll into the anchor hole, and accordingly, the hollow grouting anchor rod is pushed by the punching machine while driving the hollow grouting anchor rod to twist, so that the hollow grouting anchor rod is pushed in while twisting and the resin roll is stirred, and after the blocking steel bar is nailed into the bottom of the hole, the conical expansion stud expands the end face cross groove in the expansion section and squeezes the hole wall to complete the mechanical anchoring, and at the same time the resin roll is cured to complete the resin bonding anchoring.

10. The anchoring method according to claim 7, characterized in that: In view of the suitable conditions for manual standing work, a hollow grouting anchor with an installation rod is selected. Accordingly, S3 specifically includes: S321, inserting the mounting rod into the hollow rod body, and inserting the hexagonal wrench at the end of the mounting rod into the hexagonal notch of the extended hexagonal socket bolt; S322, inserting the hollow grouting anchor rod together with the mounting rod into the anchor hole until the bottom of the hole; S323. Use a pneumatic wrench to connect the hexagonal wrench at the other end of the installation rod, start the pneumatic wrench to drive the extended hexagonal bolt to twist through the installation rod, and finally drive the conical expansion stud to rotate and wedge into the expansion section of the hollow rod body, expand the end face cross slot in the expansion section and squeeze the hole wall to achieve anchoring.

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