A pressure-dispersive anchoring device and method

Abstract

The present invention provides a pressure-dispersing type anchoring device and method, which relates to the technical field of bolt support. It includes a stamping head and a pressure-applying assembly, and comprises a cable bolt, a hollow bolt and a bearing plate connecting the hollow bolt. A convex block is provided on one side of the bearing plate. The bearing plate is provided with a first hole and a second hole located on the side of the convex block. One end of the cable bolt passes through the first hole, bypasses the convex block and then passes through the second hole. The cable bolt is in contact with the convex block, and the contact area is arc-shaped. Aiming at the problem that the current composite anchoring structure is prone to failure, a convex block is provided on the bearing plate connecting the hollow bolt as the force-bearing support of the cable bolt. The cable bolt bypasses the convex block and remains in contact with the convex block to disperse the concentrated stress of the cable bolt, improve the cooperative stress state of the cable bolt and the bearing plate, and improve the reliability of the composite anchoring structure.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt support, and particularly relates to a pressure-dispersive anchoring device and method. Background Art

[0002] In current tunnel engineering, it is mainly divided into mountain tunnels and undersea tunnels. Whether it is a mountain tunnel or an undersea tunnel, during construction, it is required to construct initial support as a safety guarantee for on-site construction. In the support forms of such projects, shotcrete-bolt support is mostly adopted, and the construction of bolts is an important part among them. Currently, the more commonly used bolt grouting material is cement mortar, and usually a steel bar or steel pipe is used as the rod body. Such bolts can exert their due support capacity when the surrounding rock properties are good.

[0003] When the tunnel is located in grade-IV or grade-V surrounding rock with poor surrounding rock properties, the broken rock mass may not only cause difficult hole formation due to possible hole collapse, but also may cause bond failure between the bolt grouting body and the rock due to poor bond strength between the anchor body and the broken rock mass, resulting in the bolt being unable to fully exert its anchoring force. Moreover, the broken rock mass is mostly located on the rock fracture zone, and has a high requirement for the pull-out resistance. A single rod body cannot meet the design requirements or the cost is too high.

[0004] In the prior art, a variety of composite anchoring structures combining bolts and cables are disclosed. By fixing the end of the cable to the bolt, the bolt and the cable are made to work together to improve the anchoring performance. Usually, the cable is connected to the bolt through a bearing plate. One end of the cable passes through the bearing plate and is then cooperated with stop members such as nuts and sleeves. The traction force of the cable is applied to the bolt through the stop members. However, the used stop members are prone to loosen and fall off under the action of vibration or corrosion, resulting in connection failure; at the same time, the force coordination between the cable strand and the stop member is poor. Under the long-term action of force, it is easy to cause shear failure of the strand and also easy to cause damage to the bearing plate, resulting in the failure of the composite anchoring structure. Summary of the Invention

[0005] The purpose of the present invention is to address the defects existing in the prior art, and provide a pressure-dispersive anchoring device and method. By providing a convex block on the bearing plate connecting the hollow bolt as the force support for the cable, the cable bypasses the convex block and remains in contact with the convex block, dispersing the concentrated stress of the cable, improving the cooperative stress state between the cable and the bearing plate, and enhancing the reliability of the composite anchoring structure.

[0006] The first purpose of the present invention is to provide a pressure-dispersive anchoring device, adopting the following scheme:

[0007] It includes a cable, a hollow bolt, and a bearing plate connecting the hollow bolt. A convex block is provided on one side of the bearing plate. The bearing plate is provided with a first hole and a second hole located on the side of the convex block. One end of the cable passes through the first hole, bypasses the convex block, and then passes through the second hole. The cable is in contact with the convex block, and the contact area is arc-shaped.

[0008] Further, a plurality of anchor cables are provided, and the bumps on the load-bearing plate correspond to the anchor cables one by one, and the bumps are arranged around the hollow anchor rod.

[0009] Further, the bump is provided with a groove for accommodating the anchor cable, one end of the groove track is smoothly butted against the first hole, and the other end is smoothly butted against the second hole, so that the groove combines the first hole and the second hole to form a U-shaped section of the anchor cable.

[0010] Further, the hollow anchor rod is detachably connected with a hollow drill rod, and a casing is sleeved outside the hollow drill rod, and the casing covers the matching position of the hollow anchor rod and the hollow drill rod.

[0011] Further, when the hollow drill rod is connected to the hollow anchor rod, the hollow anchor rod, the hollow drill rod and the casing are distributed in sequence along the radial direction, and one end of the casing abuts against the load-bearing plate.

[0012] Further, the load-bearing plate is provided with grout penetration holes, and the grout penetration holes are arranged to avoid the bumps and penetrate through the load-bearing plate.

[0013] Further, the hollow anchor rod penetrates through the load-bearing plate, the outer wall of the hollow anchor rod is fixedly connected to the load-bearing plate, the hollow anchor rod is butted against a grouting pipe, and a drill bit is connected to the grouting pipe.

[0014] Further, the grouting pipe, the hollow anchor rod and the drill bit are coaxially arranged, the drill bit is a triangular drill bit, and the triangular drill bit divides the outlet end of the grouting pipe into three isolated outlets.

[0015] The second object of the present invention is to provide a pressure-dispersed anchoring method, which uses the pressure-dispersed anchoring device as described in the first object, including:

[0016] Assemble the anchor cable and the load-bearing plate, so that the anchor cable passes through the first hole and then fits around the second hole, and free ends are formed at both ends of the anchor cable;

[0017] Drive the hollow anchor rod, the load-bearing plate and the anchor cable into the rock mass through drilling, and the free ends of the anchor cable are located outside the drill hole;

[0018] Grout the drill hole through the hollow anchor rod, and after reaching the designed strength, tension and lock the anchor cable.

[0019] Further, after the drilling is completed, adjust the anchor cable by pulling the free end of the anchor cable to keep the anchor cable in contact with the bump.

[0020] Compared with the prior art, the advantages and positive effects of the present invention are:

[0021] (1) Aiming at the problem that the current composite anchoring structure is prone to failure, by setting bumps on the bearing plate connecting the hollow anchor rod as the force-bearing support for the cable anchor, the cable anchor bypasses the bumps and keeps in contact with them, dispersing the concentrated stress of the cable anchor, improving the cooperative stress state between the cable anchor and the bearing plate, and enhancing the reliability of the composite anchoring structure.

[0022] (2) Making full use of the structure of the cable anchor itself to fix its end, avoiding problems such as loosening of the screws fixed in the traditional way due to vibration or corrosion, and overall shear failure of the bearing plate.

[0023] (3) A through-hole for the cable anchor to pass through is provided on the bearing plate. The through-hole and the groove on the bump are used to fix the cable anchor in the groove after passing through the through-hole. When the cable anchor is in tension, the groove on the bump can limit its deviation and maintain the connection state between the cable anchor, the bump and the bearing plate. The cable anchor can slide along the groove, and a structure similar to a fixed pulley is used to meet the adjustment requirements of the cable anchor.

[0024] (4) The cable anchor cooperates with the fixing hole on the bearing plate and the groove on the bump to form a U-shaped force transmission structure, which can improve the load borne, avoid multiple cutting and fixing of the cable anchor during assembly, make the assembly faster, the smooth U-shaped force transmission structure can avoid the shear failure of the cable anchor, and the improved stress state can slow down the damage caused by the local stress of the bearing plate.

[0025] (5) A sleeve structure is provided to protect the mating position of the detachable hollow drill rod and the hollow anchor rod. The hollow area formed inside the sleeve can isolate the mating position from the slurry, facilitating disassembly and assembly, and at the same time saving the injected resin slurry without affecting the tensile performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0027] Figure 1 It is a schematic diagram of the cooperation of the hollow anchor rod, the hollow drill rod and the sleeve in Embodiment 1 or 2 of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the cable anchor cooperating with the bearing plate in Embodiment 1 or 2 of the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the cable anchor in Embodiment 1 or 2 of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the anchor fitting in Embodiment 1 or 2 of the present invention.

[0031] In the figure, 1 is a drill bit; 2 is a slurry outlet; 3 is a grouting pipe; 4 is a hollow anchor rod; 5 is a hollow drill pipe; 6 is a casing; 7 is a bearing plate; 8 is a groove; 9 is a fixing hole; 10 is a slurry permeation hole; 11 is a connecting hole; 12 is a steel strand; 13 is a plastic sleeve; 14 is a gasket; 15 is an anchor; 16 is a wedge grip. Detailed implementation mode

[0032] Embodiment 1

[0033] In a typical embodiment of the present invention, as Figures 1 - 4 shown, a pressure-dispersive anchoring device is provided.

[0034] As Figure 1 shown, the pressure-dispersive anchoring device is used for grouting and strengthening the surrounding rock of a tunnel. In particular, a composite anchoring structure is formed by combining an anchor rod and a cable to reinforce the surrounding rock of the tunnel. By providing a convex block on the bearing plate 7 connecting the hollow anchor rod 4 as the stress support of the cable, the cable bypasses the convex block and remains in contact with the convex block to disperse the concentrated stress of the cable and improve the cooperative stress state between the cable and the bearing plate 7. At the same time, resin is used as the grouting liquid for grouting to improve the reliability of the composite anchoring structure.

[0035] Combined with Figure 1 、 Figure 2 , the pressure-dispersive anchoring device mainly includes a drill bit 1, a grouting pipe 3, a hollow anchor rod 4, a hollow drill pipe 5, a bearing plate 7 and a cable. Among them, a connecting hole 11 is provided on the bearing plate 7, and the hollow anchor rod 4 passes through the connecting hole 11 and is fixedly connected to the bearing plate 7 through the cooperation of its outer wall and the connecting hole 11; a convex block is provided on one side of the bearing plate 7, and the bearing plate 7 is provided with a first hole and a second hole on the side of the convex block. One end of the cable passes through the first hole, bypasses the convex block and then passes through the second hole. The cable is in contact with the convex block, and the contact area is arc-shaped, and the convex block and the main body of the bearing plate 7 are stressed cooperatively.

[0036] The hollow anchor rod 4 is detachably connected to the hollow drill pipe 5, and a casing 6 is sleeved outside the hollow drill pipe 5. The casing 6 covers the mating position of the hollow anchor rod 4 and the hollow drill pipe 5; the hollow anchor rod 4 penetrates through the bearing plate 7, the outer wall of the hollow anchor rod 4 is fixedly connected to the bearing plate 7, the hollow anchor rod 4 is butt-connected to the grouting pipe 3, and the drill bit 1 is connected to the grouting pipe 3.

[0037] As Figure 1 shown, the drill bit 1 in this embodiment is a triangular drill bit 1. The triangular drill bit 1 divides the outlet end of the grouting pipe 3 into three isolated outlets, forming three dispersed slurry outlets 2; the triangular drill bit 1 is made of three-wing steel plate material. Before welding, it is cut to reserve the space required for the hollow grouting pipe 3, and then it is connected to the grouting pipe 3 by welding. The grouting pipe 3 is a hollow structure.

[0038] The angle between adjacent wings of the three wings of the triangular drill bit 1 is 120°, and its hole expansion radius is larger than the radius at any cross section on the pressure-dispersed anchoring device. When drilling, the drill hole formed by the triangular drill bit 1 can enable various components at the rear to smoothly enter the drill hole. At the same time, the dispersed slurry outlet 2 can promote the flow of the output resin slurry, so that the resin slurry can flow smoothly during grouting, ensuring that the slurry can fill the rock cavity more evenly and quickly during grouting.

[0039] One axial end of the hollow grouting pipe 3 is welded to the triangular drill bit 1, and the other end is connected to the hollow anchor rod 4. The hollow anchor rod 4 is connected to the inside of the grouting pipe 3, and together they serve as a slurry passing structure.

[0040] In order to realize the connection between the hollow anchor rod 4 and the hollow drill rod 5, a threaded section is provided on the hollow anchor rod 4, and the whole is a hollow tube with a threaded structure, and the internal hollow structure can allow slurry to flow; at the same time, the load-bearing plate 7 can be fixed, and the grouting pipe 3 is connected to the hollow anchor rod 4, and the grouting pipe 3, the hollow anchor rod 4 and the drill bit 1 are coaxially arranged. The hollow drill rod 5 and the hollow anchor rod 4 are screwed together by threads, and the outer diameter of the hollow drill rod 5 is smaller than the inner diameter of the casing 6, so that the casing 6 can be installed.

[0041] like Figure 1 As shown, the hollow drill rod 5 is a hollow tube with a threaded structure, and the threaded structure of the hollow drill rod 5 can form a detachable fit with the threaded section of the hollow anchor rod 4. When the hollow drill rod 5 is driven into the rock mass, the threaded structure of the inner wall of the hollow drill rod 5 is connected with the threaded structure of the hollow anchor rod 4.

[0042] like Figure 1 As shown, when the hollow drill rod 5 is connected to the hollow anchor rod 4, the hollow anchor rod 4, the hollow drill rod 5 and the casing 6 are sequentially distributed along the radial direction, and one end of the casing 6 abuts against the bearing plate 7. Figure 2 As shown, the hollow drill rod 5 and the hollow anchor rod 4 are fixed by tightening, the hollow drill rod 5 is located on the side of the bearing plate 7 away from the drill bit 1, the hollow anchor rod 4 and the hollow drill rod 5 serve as a force transmission structure connecting the drill bit 1 and the drilling drive equipment, the hollow drill rod 5, the hollow anchor rod 4, the grouting pipe 3 and the drill bit 1 are all driven into the rock formation, and when grouting is required after the drilling is completed, the slurry is injected using the end of the hollow drill rod 5 left outside the rock formation.

[0043] After the injected slurry completely covers the anchor drill bit 1 and the bearing plate 7, the hollow drill rod 5 is rotated in the reverse direction to withdraw, and during the withdrawal process, the slurry outlet 2 of the hollow drill rod 5 still needs to be kept below the slurry liquid level.

[0044] The casing 6 is always sleeved outside the hollow drill pipe 5 before the hollow drill pipe 5 is withdrawn, so as to prevent the resin slurry from contacting the hollow drill pipe 5, avoid the injected slurry from jamming the hollow drill pipe 5 after curing, and facilitate the disassembly and assembly of the drill pipe. At the same time, the structure of the casing 6 is provided to protect the mating position of the detachable hollow drill pipe 5 and the hollow anchor bolt 4. One end of the casing 6 abuts against the bearing plate 7, and the hollow area formed inside the casing 6 can isolate the mating position from the slurry, facilitating its disassembly and assembly. At the same time, without affecting the tensile performance, the injected resin slurry is saved and the material cost is reduced.

[0045] The bearing plate 7 has a connection hole 11 for the hollow anchor bolt 4 to fit at the inner central position. There are multiple anchor cables, and the convex blocks on the bearing plate 7 correspond to the anchor cables one by one, and the convex blocks are arranged around the hollow anchor bolt 4.

[0046] At the same time, the convex block is provided with a groove 8 for accommodating the anchor cable. One end of the track of the groove 8 is smoothly butted with the first hole, and the other end is smoothly butted with the second hole, so that the groove 8 combines the first hole and the second hole to form a U-shaped section of the anchor cable.

[0047] In this embodiment, the bearing plate 7 is in a circular disc shape. Both the first hole and the second hole are fixed holes 9 for the anchor cable to pass through. There are two groups of four fixed holes 9 in total on the bearing plate 7 along the circumferential direction of the hollow anchor bolt 4. Each group includes the first hole and the second hole. At the same time, the bearing plate 7 is provided with slurry permeation holes 10, and the slurry permeation holes 10 are arranged to avoid the convex blocks and penetrate through the bearing plate 7. As Figure 2 the four slurry permeation holes 10 in, there are convex blocks on the bearing plate 7, and the groove 8 is formed on the convex block as the anchor cable fixing groove. Four circular slurry permeation holes 10 are evenly opened on the circular punching bearing plate as the flow channels of the resin slurry, and at the same time, the integrity of the resin cured body and the anchor head is enhanced.

[0048] It can be understood that the groove 8 can also be obtained by bending a channel steel into an arc shape and fixing it on the bearing plate 7, ensuring a good contact state between the groove 8 and the anchor cable, so that the anchor cable and the groove 8 have a good force coordination effect.

[0049] The two ends of the groove 8 corresponding to its track are respectively connected to different fixed holes 9; after the hollow anchor bolt 4 passes through the connection hole 11, it is welded and fixed to the bearing plate 7. As Figure 3 shown, the anchor cable adopts a structure of a steel strand 12 wrapped with a plastic sleeve 13.

[0050] When assembling the pressure-dispersed anchoring device, one end of the anchor cable needs to pass through the fixed hole 9 and be placed in the groove 8, and then the other end of the anchor cable passes through another fixed hole 9 in the same group, so that the section of the anchor cable in the area of the groove 8 and the fixed hole 9 is U-shaped, which is convenient for transmitting the transmitted tension to the bearing plate 7 and then to the anchor solid formed by grouting.

[0051] The cable anchor cooperates with the fixing hole 9 on the bearing plate 7 and the groove 8 on the convex block to form a U-shaped force transmission structure, which can improve the load carried, avoid multiple cutting and fixing of the cable anchor during assembly, make the assembly faster, and the smooth U-shaped force transmission structure can avoid the shear failure of the cable anchor. The improved stress state can slow down the damage caused by the local stress of the bearing plate.

[0052] As Figure 4 shown, the anchor includes a gasket 14, an anchor ingot 15 and wedge-shaped gripping elements 16. After the grouting is completed and the anchor solid formed by the grouting reaches the specified requirements, the cable anchor is sequentially passed through the reserved holes on the gasket 14, the reserved holes on the anchor ingot 15, and the wedge-shaped gripping elements 16; a jack is used for tensioning and locking.

[0053] The injected grout uses resin grout. When the pressure-dispersive anchorage device is driven into the rock formation, compared with ordinary grouting bolts, the drilling and the rod body entering the hole are completed at one time, and there is no need to repeatedly pull out and insert in the middle, which can better prevent the situation of hole collapse and hole jamming, and the construction speed is relatively fast; the presence of the casing 6 can make the centering of the whole bolt in the hole better, the resin grout can better wrap the rod body, and at the same time, four-strand rubber-coated steel strands 12 are used to replace the hard drill rod. The combination of the two can greatly reduce the rusting of the bolt in the case of rich water and high acid-base, and extend the service life of the bolt.

[0054] After injecting the resin grout, in view of the short curing time of the resin grout, it can reinforce the broken surrounding rock in a short time and provide the initial support capacity for the tunnel under poor geological conditions. After curing, the bonding force between the synthetic resin and the rock is 2 to 3 times greater than that of the cement mortar, avoiding the bonding failure between the grouting body and the rock body under the action of load, ensuring the normal exertion of the bolt support capacity, and meeting the requirements of the high tensile design value.

[0055] After the grouting is completed, the hollow drill rod 5 that combines grouting and force transmission can be withdrawn, and the rubber-coated prestressed steel strands 12 are used to replace the hollow drill rod 5. This can not only bear greater tension, but also reduce the construction cost by recovering the bolt. If it is used as a temporary slope support, after the support task is completed, the steel strands 12 can be quickly recovered, further reducing the construction cost.

[0056] Embodiment 2

[0057] In another typical embodiment of the present invention, as Figures 1 - 4 shown, a pressure-dispersive anchoring method is given.

[0058] Combined with the pressure-dispersive anchorage device in Embodiment 1, in this embodiment, the pressure-dispersive anchoring method is introduced, including the following content:

[0059] Assemble the cable anchor and the bearing plate 7, pass the cable anchor through the first hole and then fit it around the second hole, and form free ends at both ends of the cable anchor;

[0060] Drive the hollow anchor rod 4, the bearing plate 7 and the cable anchor into the rock mass through drilling. The free ends of the cable anchor are located outside the drill hole;

[0061] After the drilling is completed, adjust the cable anchor by pulling the free end of the cable anchor to keep the cable anchor in contact with the convex block;

[0062] Grout the drill hole through the hollow anchor rod 4. After reaching the designed strength, tension and lock the cable anchor.

[0063] Combined with Figure 1 、 Figure 2 and Figure 4 , for the above anchoring method, it includes the following detailed steps:

[0064] 1) Preparation work: Prepare the pressure-dispersed anchoring device and supporting installation equipment, and assemble the pressure-dispersed anchoring device and prepare the resin grout according to the drawing requirements;

[0065] 2) Measurement and marking: After the initial spraying of the tunnel is completed to form the concrete surface layer, measure and set out the lines, determine the positions of the anchor rod drill holes and mark them;

[0066] 3) Drilling operation: The drilling direction of the pressure-dispersed anchoring device should be perpendicular to the rock surface or along the radial direction of the tunnel. Drive the pre-prepared drill bit 1, hollow anchor rod 4, hollow drill pipe 5 and the cable anchor into the rock mass through the jumbo;

[0067] 4) Grouting operation: Inject the pre-prepared resin grout along the hollow drill pipe 5 through the grouting equipment. Stop grouting after the slurry comes out from the exhaust port, withdraw the hollow drill pipe 5, and keep the hollow anchor rod 4, drill bit 1 and grouting pipe 3 in the drill hole;

[0068] 5) Tensioning and locking: After reaching the designed strength, use the anchor to tension and lock, and seal the anchor rod hole;

[0069] 6) Quality inspection: Use a non-destructive detector for anchor rods and cable anchors to conduct construction quality inspection.

[0070] The bearing plate 7 is provided with through holes for the cable anchor to pass through. The through holes and the grooves 8 on the convex block are used to fix the cable anchor in the groove 8 after passing through the through holes. When the cable anchor is under tension, the groove 8 on the convex block can limit its deviation and maintain the connection state of the cable anchor, the convex block and the bearing plate 7. The cable anchor can slide along the groove 8, and a structure similar to a fixed pulley is used to meet the adjustment requirements of the cable anchor.

[0071] Make full use of the structure of the cable anchor itself to fix its end, avoiding problems such as loosening of the screws fixed in the traditional way due to vibration or corrosion, and overall shear failure of the bearing plate.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure-dispersive anchoring device, characterized in that, It includes a cable anchor, a hollow anchor rod and a bearing plate connecting the hollow anchor rod. A convex block is provided on one side of the bearing plate. The bearing plate is provided with a first hole and a second hole located on the side of the convex block. One end of the cable anchor passes through the first hole, bypasses the convex block and then passes through the second hole. The cable anchor is in contact with the convex block, and the contact area is arc-shaped. A groove for accommodating the cable anchor is provided on the convex block. One end of the groove track is smoothly connected to the first hole, and the other end is smoothly connected to the second hole, so that the groove combines the first hole and the second hole to form a U-shaped section of the cable anchor. By providing a convex block on the bearing plate connecting the hollow anchor rod as the force-bearing support of the cable anchor, the cable anchor bypasses the convex block and remains in contact with the convex block to disperse the concentrated stress of the cable anchor. There are multiple cable anchors, and the convex blocks on the bearing plate correspond to the cable anchors one by one, and the convex blocks are arranged around the hollow anchor rod. The hollow anchor rod is detachably connected to a hollow drill pipe. A casing is sleeved outside the hollow drill pipe, and the casing covers the mating position of the hollow anchor rod and the hollow drill pipe.

2. The pressure-dispersive anchoring device according to claim 1, characterized in that, When the hollow drill pipe is connected to the hollow anchor rod, the hollow anchor rod, the hollow drill pipe and the casing are distributed in sequence along the radial direction, and one end of the casing abuts against the bearing plate.

3. The pressure-dispersing anchoring device according to claim 1, characterized in that The bearing plate is provided with grout holes, and the grout holes are arranged to avoid the convex blocks and penetrate through the bearing plate.

4. The pressure-dispersive anchoring device according to claim 1, characterized in that, The hollow anchor rod penetrates through the bearing plate, the outer wall of the hollow anchor rod is fixedly connected to the bearing plate, the hollow anchor rod is butted against a grouting pipe, and a drill bit is connected to the grouting pipe.

5. The pressure-dispersing anchoring device according to claim 4, wherein The grouting pipe, the hollow anchor rod and the drill bit are coaxially arranged. The drill bit is a triangular drill bit, and the triangular drill bit divides the outlet end of the grouting pipe into three isolated outlets.

6. A pressure-dispersive anchoring method, which uses the pressure-dispersive anchoring device according to any one of claims 1-5, characterized in that, It includes: Assemble the cable anchor and the bearing plate, so that the cable anchor passes through the first hole and then fits around the second hole, and free ends are formed at both ends of the cable anchor. Drive the hollow anchor rod, the bearing plate and the cable anchor into the rock mass through drilling, and the free ends of the cable anchor are located outside the drill hole. Grout the drill hole through the hollow anchor rod. After reaching the designed strength, tension and lock the cable anchor.

7. The pressure dispersion type anchoring method according to claim 6, characterized in that, After the drilling is completed, adjust the cable anchor by pulling the free end of the cable anchor to keep the cable anchor in contact with the convex block.

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