Anchor rod for tunnel construction and construction method thereof

Abstract

The present application relates to the field of anchor rod technology, and in particular to an anchor rod for tunnel construction, comprising an outer sleeve, an inner sleeve, and a plurality of limit devices, wherein the outer sleeve is sleeved on the outer periphery of the inner sleeve, and the limit devices include a locking assembly and a plurality of limit support assemblies; the limit support assembly includes a first rotating rod, a second rotating rod, and a slider, wherein one end of the first rotating rod is rotatably connected to the outer wall of the outer sleeve, and the other end is rotatably connected to the second rotating rod, and the second rotating rod is rotatably connected to the slider at one end away from the first rotating rod, and the slider is provided on the inner sleeve; a slide groove is provided on the outer sleeve; and the present application also relates to a method for constructing an anchor rod for tunnel construction, comprising drilling an anchor rod hole, cleaning the anchor rod hole, initially installing the anchor rod, positioning the anchor rod, and grouting. The tunnel construction anchor rod and its construction method facilitate the central distribution of the anchor rod by using the first rotating rod and the second rotating rod, so that the anchor rod is located at the center of the anchor rod hole, thereby evenly distributing the cement slurry around the anchor rod, and improving the overall strength of the construction body.

Description

Technical Field

[0001] The present application relates to the field of anchor rod technology, and in particular to anchor rods for tunnel construction and a construction method thereof. Background Art

[0002] Anchor rods are a basic component used for the main reinforcement of slopes, tunnels, dams and roadway supports in coal mines. As a tensile member deep in the stratum, one end of the anchor rod is connected to the engineering structure, and the other end is deep in the stratum. The entire anchor rod consists of a free section and an anchoring section. The free section refers to the area where the tension at the anchor rod head is transmitted to the anchor body; the anchoring section refers to the area where the cement slurry bonds the prestressed tendons to the soil layer, transmitting the tension of the free section to the deep soil.

[0003] The patent document with application number 202010761438.7 discloses an anchor rod for tunnel support, comprising a coaxial and assembleable first rod body and a second rod body, a threaded hole coaxial with the first rod body is opened inward at the end of the first rod body, and an annular groove coaxial with the second rod body and with an internal thread is opened inward at the end of the second rod body, the solid body surrounded by the annular groove is a threaded rod structure, the side wall of the threaded hole is adapted to be inserted into the annular groove, and the inner wall of the threaded hole is threadedly connected to the solid body, and the outer wall of the threaded hole is threadedly connected to the inner wall of the annular groove; an annular plug-in sleeve coaxial with the first rod body is fixed on the outer wall of the first rod, and the side wall of the annular groove is adapted to be inserted into the annular plug-in sleeve; the inner wall of the annular plug-in sleeve is provided with an internal thread, and the outer wall of the annular groove is provided with an external thread, and the side wall of the annular groove is threadedly connected to the annular plug-in sleeve.

[0004] Regarding the above-mentioned related technologies, the applicant believes that during the anchor rod construction process, an anchor rod hole is first opened at the construction position of the construction body. After the anchor rod hole is processed, the anchor rod is pushed into the hole, and then cement slurry is injected into the anchor rod hole. However, due to the long length of the anchor rod extending into the anchor rod hole, the end of the anchor rod extending into the anchor rod hole is close to the wall of the anchor rod hole, resulting in uneven distribution of cement slurry around the anchor rod, affecting the overall strength of the construction body. Summary of the Invention

[0005] In order to improve the overall strength of the construction body, the present application provides an anchor rod for tunnel construction and a construction method thereof.

[0006] In a first aspect, the present application provides an anchor rod for tunnel construction, which adopts the following technical solution:

[0007] An anchor rod for tunnel construction, comprising an outer sleeve, an inner sleeve, and a plurality of limit devices, wherein the outer sleeve is sleeved on the outer periphery of the inner sleeve, and the plurality of limit devices are evenly distributed along the axial direction of the outer sleeve;

[0008] The limiting device includes a locking assembly and a plurality of limiting support assemblies, and the plurality of limiting support assemblies are evenly distributed along the circumferential direction of the outer sleeve;

[0009] The limit support assembly includes a first rotating rod, a second rotating rod and a slider, one end of the first rotating rod is rotatably connected to the outer wall of the outer sleeve, and the other end is rotatably connected to the second rotating rod, and the second rotating rod is rotatably connected to the slider at one end away from the first rotating rod, and the slider is arranged on the inner sleeve; a sliding groove for sliding the second rotating rod is provided on the outer sleeve, and the sliding groove is arranged along the axial direction of the outer sleeve;

[0010] The locking assembly is used to fix the position of the slider.

[0011] By adopting the above technical solution, during the installation of the anchor rod, the staff pushes the anchor rod into the anchor rod hole, and then pushes the inner sleeve to move along the axial direction of the outer sleeve, the inner sleeve drives the slider to move, the slider acts on the second rotating rod, and the second rotating rod drives the first rotating rod to move. Since the distance between the connection point between the second rotating rod and the inner sleeve and the connection point between the first rotating rod and the outer sleeve gradually decreases, the rotation point of the first rotating rod and the second rotating rod moves to the side away from the axis of the inner sleeve, and moves until the rotation point of the first rotating rod and the second rotating rod abuts the hole wall of the anchor rod hole, so that the inner sleeve and the outer sleeve are located in the center position of the anchor rod hole, and then the position of the slider is fixed by the locking assembly; the designed tunnel construction anchor rod facilitates the central distribution of the anchor rod through the first rotating rod and the second rotating rod, so that the anchor rod is located in the center position of the anchor rod hole, thereby making the cement slurry evenly distributed around the anchor rod, thereby improving the overall strength of the construction body.

[0012] Optionally, the inner sleeve is provided with a plurality of annular grooves for the sliding movement of the slider, the plurality of annular grooves are evenly distributed along the axial direction of the inner sleeve, and the plurality of sliders of the same limiting device are installed in the annular grooves, and the annular grooves are arranged along the circumferential direction of the inner sleeve.

[0013] By adopting the above technical solution, the designed annular groove facilitates the slider to rotate along the circumferential direction of the inner sleeve.

[0014] Optionally, the locking assembly includes a locking ring, which is coaxially sleeved on the inner sleeve, and the locking ring is located between the inner sleeve and the outer sleeve, and the locking ring is threadedly connected to the outer sleeve.

[0015] By adopting the above technical solution, the locking assembly is designed, which facilitates the position fixation of the inner sleeve and the outer sleeve through the threaded connection between the locking ring and the outer sleeve, thereby achieving the limitation of the rotation angle of the first rotating rod and the second rotating rod.

[0016] Optionally, the outer sleeve includes an integrally arranged conical section and a cylindrical section, the cross-sectional area of ​​the conical section gradually decreases from one end close to the cylindrical section to one end away from the cylindrical section, the cylindrical section is sleeved on the inner sleeve, and the locking ring is threadedly connected to the end of the cylindrical section away from the conical section.

[0017] By adopting the above technical solution, the outer sleeve is arranged in sections, and its tapered section facilitates the outer sleeve to extend into the anchor hole, reducing the damage to the anchor hole wall caused by the tapered section during the process of the outer sleeve extending into the anchor hole; its cylindrical section facilitates cooperation with the inner sleeve to realize the position adjustment of the first rotating rod and the second rotating rod, thereby realizing the central distribution of the anchor rod.

[0018] Optionally, a plurality of discharge ports are provided on the side wall of the conical section, and the discharge ports are communicated with the inner cavity of the cylindrical section.

[0019] By adopting the above technical solution, the designed discharge port facilitates the cement slurry to enter between the outer casing and the wall of the anchor hole, thereby filling the cavity between the outer casing and the wall of the anchor hole and ensuring the overall strength of the construction body.

[0020] Optionally, an abutment plate for abutting against the wall of the anchor rod hole is provided at the rotational connection between the first rotating rod and the second rotating rod.

[0021] By adopting the above technical solution, the designed abutment plate is convenient for increasing the contact area between the first rotating rod and the second rotating rod rotating joint and the anchor rod hole wall, and increasing the friction between the first rotating rod and the second rotating rod rotating joint and the anchor rod hole wall, while reducing the damage of the first rotating rod and the second rotating rod rotating joint to the anchor rod hole wall.

[0022] Optionally, a sealing plate for sealing between the anchor hole and the outer sleeve is provided at one end of the cylindrical section away from the conical section.

[0023] By adopting the above technical solution, the designed sealing plate is convenient for sealing the gap between the anchor hole wall and the outer casing, preventing cement slurry from flowing out along the anchor hole opening.

[0024] In a second aspect, the present application provides a method for anchoring for tunnel construction, which adopts the following technical solution:

[0025] A method for constructing an anchor rod for tunnel construction comprises the following steps:

[0026] S1. Anchor hole drilling: First locate the anchor hole position on the construction foundation, then use the drilling rig to perform rotary drilling until the drilling depth meets the requirements;

[0027] S2, cleaning of anchor holes;

[0028] S3. Initial installation of anchor rods: Manually push and place the anchor rods. If the placement of the anchor rods is smooth, extend the anchor rods until they are flush with the abutment plate and the surface of the construction foundation, and then proceed to the next step. If the placement of the anchor rods is blocked, remove the anchor rods, correct the anchor rod holes, and then proceed to step S2.

[0029] S4. Anchor positioning:

[0030] S41, pushing the inner sleeve toward the anchor hole, the inner sleeve drives the slider to move along the axial direction of the outer sleeve, the slider drives the second rotating rod and the first rotating rod to rotate, and the second rotating rod and the first rotating rod drive the abutment plate to move toward the wall of the anchor hole;

[0031] S42, when the locking ring contacts the outer ring, the inner sleeve is rotated, and the inner sleeve drives the locking ring to rotate, thereby achieving a threaded connection between the locking ring and the outer sleeve. At the same time, the inner sleeve drives the slider to continue to extend into the anchor hole, and the slider drives the second rotating rod and the first rotating rod to continue to rotate, and the second rotating rod and the first rotating rod drive the abutment plate to press against the wall of the anchor hole;

[0032] S5. Grouting.

[0033] By adopting the above technical solution, first, the staff carves the anchor hole position on the construction foundation according to the construction position, and then uses the drilling rig to perform rotary drilling until the drilling depth meets the requirements; then the residue in the anchor hole is cleaned; then the staff pushes the anchor into the anchor hole along the direction of the anchor hole. If the anchor is pushed smoothly, the anchor is extended until the abutment plate is flush with the surface of the construction foundation, and then proceed to the next step; if the anchor is pushed, the anchor is removed, and the anchor hole is corrected, and then the residue in the anchor hole is cleaned; then the anchor is reinstalled; the inner sleeve is pushed to one side of the anchor hole, and the inner sleeve drives the slider to move along the axial direction of the outer sleeve, and the slider drives the second rotating rod and the first rotating rod to move with the second rotating rod. When the first rotating rod rotates, the second rotating rod and the first rotating rod drive the abutment plate to move toward the side of the anchor hole wall. When the movement moves to the locking ring and the outer ring, the inner sleeve is rotated, and the inner sleeve drives the locking ring to rotate, thereby realizing the threaded connection between the locking ring and the outer sleeve. At the same time, the inner sleeve drives the slider to continue to extend into the anchor hole, and the slider drives the second rotating rod and the first rotating rod to continue to rotate, and the second rotating rod and the first rotating rod drive the abutment plate to press against the anchor hole wall; then cement slurry is injected into the anchor hole, and after the cement slurry solidifies, the installation of the anchor is completed; the designed anchor construction method for tunnel construction is convenient for realizing the central distribution of the anchor, and then the cement slurry is evenly distributed on the surrounding side of the anchor, thereby improving the overall strength of the construction body.

[0034] Optionally, S5 includes a primary grouting stage and a secondary grouting stage; the primary grouting stage is to extend the grouting pipe into the cavity of the inner casing, and the distance between the grouting outlet of the grouting pipe and the bottom wall of the anchor hole is 140mm to 160mm, and grouting is performed from the inside to the outside; the secondary grouting stage is to extend the grouting pipe into the cavity of the inner casing, and grouting is performed into the inner cavity of the inner casing, and the grouting pipe is gradually pulled out during the grouting process until the grouting of the inner casing is completed and the grouting pipe is pulled out.

[0035] By adopting the above technical solution, the grouting pipe is extended into the cavity of the inner casing, and the distance between the grouting outlet of the grouting pipe and the bottom wall of the anchor hole is 140mm to 160mm, and cement slurry is injected from the bottom of the anchor hole to the mouth of the anchor hole. After the cement slurry grouting is completed, the grouting pipe is pulled out; cement slurry is continued to be injected into the grouting hole, and grouting is performed into the inner cavity of the inner casing, and the grouting pipe is gradually pulled out until the grouting of the inner casing is completed and the grouting pipe is pulled out.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. The designed anchor bolt for tunnel construction facilitates the central distribution of the anchor bolt through the first and second rotating rods, so that the anchor bolt is located in the center of the anchor bolt hole, thereby evenly distributing the cement slurry around the anchor bolt, thereby improving the overall strength of the construction body;

[0038] 2. The designed anchor rod for tunnel construction facilitates the threaded connection between the locking ring and the outer sleeve through the locking assembly, thereby facilitating the position fixation of the inner sleeve and the outer sleeve, and realizing the limitation of the rotation angle of the first rotating rod and the second rotating rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall structure of an anchor rod for tunnel construction in Example 1 of the present application;

[0040] Figure 2 is a cross-sectional view of an anchor rod for tunnel construction according to Example 1 of the present application;

[0041] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0042] Figure 4 yes Figure 2 An enlarged schematic diagram of part B.

[0043] Explanation of the accompanying drawings: 1. Outer sleeve; 11. Conical section; 111. Discharge port; 12. Cylindrical section; 13. Limiting ring; 2. Inner sleeve; 21. Ring groove; 3. Limiting device; 31. Locking assembly; 311. Locking ring; 32. Limiting support assembly; 321. First rotating rod; 322. Second rotating rod; 323. Slider; 324. Slide groove; 33. Abutment plate; 4. Sealing plate. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-4 This application is described in further detail.

[0045] The embodiments of the present application disclose an anchor rod for tunnel construction and a construction method thereof.

[0046] Example 1

[0047] Reference Figure 1 , an anchor rod for tunnel construction, comprising an outer sleeve 1, an inner sleeve 2 and multiple groups of limiting devices 3. In the present application, the limiting devices 3 can be two groups, three groups, or four groups, as long as the outer sleeve 1 is centrally distributed. In the present embodiment, three groups of limiting devices 3 are provided, and the three groups of limiting devices 3 are evenly distributed along the axial direction of the outer sleeve 1; the outer sleeve 1 includes an integrally arranged conical section 11 and a cylindrical section 12. In the present embodiment, the conical section 11 is integrally connected to the cylindrical section 12, and the cross-sectional area of ​​the conical section 11 gradually decreases from one end close to the cylindrical section 12 to the end away from the cylindrical section 12. In the present embodiment, the conical section 11 is arranged in a hollow cone shape, and the cylindrical section 12 is sleeved on the outer surface of the inner sleeve 2 The cylindrical section 12 is provided with a sealing plate 4 for sealing between the anchor hole and the outer sleeve 1 at one end away from the conical section 11. In this embodiment, the cylindrical section 12 is integrally connected with the sealing plate 4, and a plurality of discharge ports 111 are provided on the side wall of the conical section 11. In this embodiment, the discharge ports 111 can be three, four, or five, as long as the discharge of cement slurry is achieved. In this embodiment, there are three discharge ports 111, and the three discharge ports 111 are evenly distributed along the circumferential direction of the cylindrical section 12, and the discharge ports 111 are connected to the inner cavity of the cylindrical section 12; by adjusting the limit device 3, the limit device 3 drives the outer sleeve 1 to move toward the axial position of the anchor hole, so as to realize the central distribution of the outer sleeve 1.

[0048] Reference Figure 2 A limiting blocking ring 13 is provided on the side of the conical section 11 close to the cylindrical section 12. The limiting blocking ring 13 is welded to the conical section 11, and the inner diameter of the limiting blocking ring 13 is equal to the inner diameter of the inner sleeve 2, so that when the inner sleeve 2 is installed until it is tightly against the limiting blocking ring 13, the pushing of the inner sleeve 2 is stopped.

[0049] Reference Figure 1 and Figure 2 The limiting device 3 includes a locking assembly 31 and multiple limiting support assemblies 32. The limiting support assemblies 32 in each group of limiting devices 3 can be three groups, four groups, or five groups, as long as the limiting support assemblies 32 can provide stable support for the outer sleeve 1. In this embodiment, three groups of limiting support assemblies 32 are provided, and the three groups of limiting support assemblies 32 are evenly distributed along the circumferential direction of the outer sleeve 1.

[0050] Reference Figure 1 and Figure 3 When the locking cam 321 is unlocked, the locking cam 322 is unlocked and the locking cam 323 is unlocked, so that the first and second locking cams 321 can be unlocked when the locking cam 322 is unlocked.

[0051] Reference Figure 2 and Figure 4 The locking assembly 31 is used to fix the position of the slider 323. The locking assembly 31 includes a locking ring 311. The locking ring 311 is coaxially sleeved on the inner sleeve 2, and the locking ring 311 is fixedly connected to the inner sleeve 2. The locking ring 311 is located at the end of the inner sleeve 2 away from the tapered section 11. The locking ring 311 is located between the inner sleeve 2 and the outer sleeve 1, and the locking ring 311 is threadedly connected to the end of the cylindrical section 12 away from the tapered section 11.

[0052] The implementation principle of the anchor rod for tunnel construction in the embodiment of the present application is as follows: during the installation of the anchor rod, the worker pushes the anchor rod into the anchor rod hole, and then pushes the inner sleeve 2 to move along the axial direction of the outer sleeve 1, and the inner sleeve 2 drives the slider 323 to move, and the slider 323 acts on the second rotating rod 322, so that the second rotating rod 322 slides along the sliding groove 324, and the second rotating rod 322 drives the first rotating rod 321 to move. As the distance between the connection point of the second rotating rod 322 and the inner sleeve 2 and the connection point of the first rotating rod 321 and the outer sleeve 1 gradually decreases, the first rotating rod 32 The rotation point of 1 and the second rotating rod 322 moves toward the side away from the axis of the inner sleeve 2, and the first rotating rod 321 and the second rotating rod 322 drive the abutment plate 33 to move until the abutment plate 33 abuts against the wall of the anchor hole, so that the inner sleeve 2 and the outer sleeve 1 are located at the center of the anchor hole. Then, the inner sleeve 2 is rotated, and the inner sleeve 2 drives the locking ring 311 to move, so that the locking ring 311 is threadedly connected to the cylindrical section 12. At the same time, the inner sleeve 2 drives the slider 323 to continue to move along the axial direction of the inner sleeve 2, so that the abutment plate 33 is further tightened against the wall of the anchor hole.

[0053] Example 2

[0054] A method for constructing an anchor rod for tunnel construction comprises the following steps:

[0055] S1. Anchor hole drilling: First, the staff will measure and mark the location of the anchor hole on the construction foundation according to the construction requirements, and then use the drilling rig to perform rotary drilling until the drilling depth meets the requirements;

[0056] S2. Cleaning the anchor hole: If the anchor hole is wet, clean it with clean water until it is clean. If the anchor hole is dry or has very little groundwater, use an air compressor to clean the anchor hole so that the residue remaining inside the anchor hole is cleared out of the anchor hole.

[0057] S3. Initial installation of anchor rods: Manually push and place the anchor rods. If the outer sleeve 1 is pushed and placed smoothly, insert the outer sleeve 1 and the inner sleeve 2 into the anchor rod hole until the abutment plate 33 is flush with the surface of the construction foundation, and then proceed to the next step. If the anchor rod is pushed and placed, remove the anchor rod, correct the anchor rod hole, and then proceed to step S2.

[0058] S4. Anchor positioning:

[0059] S41. Push the inner sleeve 2 toward the anchor hole. The inner sleeve 2 drives the slider 323 to move along the axial direction of the outer sleeve 1. The slider 323 drives the second rotating rod 322 and the first rotating rod 321 to rotate. The second rotating rod 322 and the first rotating rod 321 drive the abutment plate 33 to move toward the wall of the anchor hole.

[0060] S42, when the locking ring 311 contacts the outer ring, the inner sleeve 2 is rotated, and the inner sleeve 2 drives the locking ring 311 to rotate, so that the locking ring 311 and the outer sleeve 1 are threadedly connected. At the same time, the inner sleeve 2 drives the slider 323 to extend further into the anchor hole, and the slider 323 drives the second rotating rod 322 and the first rotating rod 321 to continue rotating. The second rotating rod 322 and the first rotating rod 321 drive the abutment plate 33 to press against the wall of the anchor hole;

[0061] S5. Grouting: including the primary grouting stage and the secondary grouting stage;

[0062] Initial grouting stage: insert the grouting pipe into the cavity of the inner casing 2, and the distance between the grouting outlet of the grouting pipe and the bottom wall of the anchor hole is 140mm to 160mm, grouting from the inside to the outside, and after the grouting is completed, pull out the grouting pipe;

[0063] Secondary grouting stage: insert the grouting pipe into the cavity of the inner casing 2, and inject grout into the inner cavity of the inner casing 2, and gradually withdraw the grouting pipe during the grouting process until the grouting of the inner casing 2 is completed, and then withdraw the grouting pipe;

[0064] Sealing and plugging: Use sealing rubber ring to stop the slurry for sealing and plugging.

[0065] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for constructing an anchor bolt for tunnel construction, characterized in that: The invention comprises an anchor rod for tunnel construction, wherein the anchor rod comprises an outer sleeve (1), an inner sleeve (2) and a plurality of groups of limiting devices (3), wherein the outer sleeve (1) is sleeved on the outer periphery of the inner sleeve (2), and the plurality of groups of limiting devices (3) are evenly distributed along the axial direction of the outer sleeve (1); The limiting device (3) comprises a locking assembly (31) and a plurality of limiting support assemblies (32), wherein the plurality of limiting support assemblies (32) are evenly distributed along the circumferential direction of the outer sleeve (1); The limiting support assembly (32) includes a first rotating rod (321), a second rotating rod (322) and a slider (323), one end of the first rotating rod (321) is rotatably connected to the outer wall of the outer sleeve (1), and the other end is rotatably connected to the second rotating rod (322), and the second rotating rod (322) is rotatably connected to the slider (323) at one end away from the first rotating rod (321), and the slider (323) is arranged on the inner sleeve (2); a sliding groove (324) for the sliding movement of the second rotating rod (322) is provided on the outer sleeve (1), and the sliding groove (324) is arranged along the axial direction of the outer sleeve (1); an abutment plate (33) for abutting the wall of the anchor hole is provided at the rotatable connection between the first rotating rod (321) and the second rotating rod (322); The locking assembly (31) is used to fix the position of the slider (323); the locking assembly (31) includes a locking ring (311), the locking ring (311) is coaxially sleeved on the inner sleeve (2), and the locking ring (311) is located between the inner sleeve (2) and the outer sleeve (1), and the locking ring (311) is threadedly connected to the outer sleeve (1); The construction method comprises the following steps: S1. Anchor hole drilling: First locate the anchor hole position on the construction foundation, then use the drilling rig to perform rotary drilling until the drilling depth meets the requirements; S2, cleaning of anchor holes; S3, initial installation of anchor rods: manually push and place the anchor rods. If the anchor rods are pushed and placed smoothly, extend the anchor rods until they are flush with the abutment plate (33) and the surface of the construction foundation, and then proceed to the next step; if the anchor rods are pushed and placed, remove the anchor rods, correct the anchor rod holes, and then proceed to step S2; S4. Anchor positioning: S41, pushing the inner sleeve (2) to move toward one side of the anchor hole, the inner sleeve (2) drives the slider (323) to move along the axial direction of the outer sleeve (1), the slider (323) drives the second rotating rod (322) and the first rotating rod (321) to rotate, and the second rotating rod (322) and the first rotating rod (321) drive the contact plate (33) to move toward the wall of the anchor hole; S42, when the locking ring (311) contacts the outer ring, the inner sleeve (2) is rotated, and the inner sleeve (2) drives the locking ring (311) to rotate, so as to realize the threaded connection between the locking ring (311) and the outer sleeve (1). At the same time, the inner sleeve (2) drives the slider (323) to continue to extend into the anchor hole, and the slider (323) drives the second rotating rod (322) and the first rotating rod (321) to continue to rotate, and the second rotating rod (322) and the first rotating rod (321) drive the abutting plate (33) to press against the wall of the anchor hole; S5. Grouting.

2. The anchor bolt construction method for tunnel construction according to claim 1, characterized in that: The inner sleeve (2) is provided with a plurality of annular grooves (21) for the sliding movement of the slider (323), the plurality of annular grooves (21) are evenly distributed along the axial direction of the inner sleeve (2), and the plurality of sliders (323) of the same limiting device (3) are installed in the annular grooves (21), and the annular grooves (21) are arranged along the circumferential direction of the inner sleeve (2).

3. The anchor bolt construction method for tunnel construction according to claim 2, characterized in that: The outer sleeve (1) comprises an integrally arranged conical section (11) and a cylindrical section (12); the cross-sectional area of ​​the conical section (11) gradually decreases from an end close to the cylindrical section (12) to an end away from the cylindrical section (12); the cylindrical section (12) is sleeved on the inner sleeve (2), and the locking ring (311) is threadedly connected to the end of the cylindrical section (12) away from the conical section (11).

4. The anchor bolt construction method for tunnel construction according to claim 3, characterized in that: A plurality of discharge ports (111) are provided on the side wall of the conical section (11), and the discharge ports (111) are communicated with the inner cavity of the cylindrical section (12).

5. The anchor bolt construction method for tunnel construction according to claim 3, characterized in that: A sealing plate (4) for sealing between the anchor hole and the outer sleeve (1) is provided at one end of the columnar section (12) away from the conical section (11).

6. The anchor bolt construction method for tunnel construction according to claim 1, characterized in that: Said S5 includes a primary grouting stage and a secondary grouting stage; The initial grouting stage is to extend the grouting pipe into the cavity of the inner casing (2), with the grouting outlet of the grouting pipe at a distance of 140 mm to 160 mm from the bottom wall of the anchor hole, and grouting from the inside out; The secondary grouting stage is to extend the grouting pipe into the cavity of the inner casing (2) and inject grout into the inner cavity of the inner casing (2), and gradually withdraw the grouting pipe during the grouting process until the grouting of the inner casing (2) is completed and the grouting pipe is withdrawn.

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