Anchor-falling-preventing yielding anchor rod device capable of achieving secondary grouting and using method of anchor-falling-preventing yielding anchor rod device

Abstract

The invention belongs to the technical field of underground engineering supporting, and particularly discloses an anchor-disengagement-preventing yielding anchor rod device capable of achieving secondary grouting and a using method thereof.The anchor-disengagement-preventing yielding anchor rod device comprises an anchor rod, an anchoring auxiliary part, an anchoring assembly, a tray part and a yielding assembly, and the anchor rod is of a hollow structure and is used for being inserted into an anchor hole; the anchor rod comprises a grouting section, an anchoring section and a yielding section which are connected in sequence, and the anchoring auxiliary part comprises an extension rod and two stop-grouting plugs. The extension rod is arranged at the end of the grouting section in the length direction of the anchor rod. The two stop-grouting plugs are arranged at the ends of the grouting section correspondingly, the stop-grouting plug close to the extension rod is used for sealing the interior of the anchor hole into an initial anchoring area, and the two stop-grouting plugs are used for sealing the portion, between the stop-grouting plugs, of the anchor hole into a secondary anchoring area. The anchor rod is matched with the anchoring auxiliary part to divide the interior of the anchor hole into the initial anchoring area and the secondary anchoring area, and secondary reinforcement can be achieved through two times of anchoring in the using process.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering support, and particularly relates to an anti-anchoring pressure-releasing anchor rod device capable of secondary grouting and a use method thereof. Background Art

[0002] In recent years, as resource extraction and infrastructure construction continue to advance into the depths of the earth, characteristics such as high geostress, high geotemperature, and high osmotic pressure have begun to emerge. Affected by the environment, deep soft rock is more prone to deformation, which is difficult to predict and has strong destructive power. Once it occurs, it will cause great harm. Today, the support problem of deep high-stress soft rock has become an important task in deep mining and tunnel engineering construction.

[0003] Anchor support can significantly improve the bearing capacity of tunnel surrounding rock and enhance its stability. It is a form of support widely and efficiently used in the field of underground engineering support. There are various forms of anchors suitable for different geological conditions. However, deep tunnels or tunnels are affected by multiple factors such as high ground stress and weak rock mass. The surrounding rock is prone to large deformation, so that the anchoring agent cementation body and the anchor rod are unanchored. Once this happens, it will cause great harm. This requires the anchor rod to not only provide a constant support force, but also to produce a large elongation deformation to meet the requirements of large deformation of the surrounding rock and to re-grout and reinforce when unanchoring occurs. In addition, ordinary anchor rods have poor compression deformation performance and are difficult to adapt to the support requirements of high ground stress or large surrounding rock deformation in deep mining environments. In addition, ordinary anchor rods are prone to unanchoring when the anchoring agent is not solidified.

[0004] Based on the above problems, there is an urgent need to develop an anchor device that can produce a large elongation deformation to meet the requirements of large deformation of the surrounding rock, and can perform secondary reinforcement when the anchor is unanchored and prevent the anchor from moving when the anchoring agent is not solidified, that is, an anchor device that integrates anti-unanchoring, deformation pressure relief and active support functions to solve the existing engineering and technical problems. Summary of the invention

[0005] In view of the above-mentioned problems, the purpose of the present invention is to provide an anti-unanchoring pressure anchor device that can be grouted for secondary grouting and a method of using the same, which can not only perform secondary reinforcement when the anchor is unanchored and prevent the anchor from moving when the anchoring agent is not solidified, but also provide a constant support force and produce a large elongation deformation to meet the requirements of large deformation of the surrounding rock.

[0006] The technical solution of the present invention is: an anti-anchoring pressure-releasing anchor rod device capable of secondary grouting, comprising:

[0007] The anchor rod is a hollow structure and is used to be inserted in the anchor hole. The anchor rod includes a grouting section, an anchoring section, and a pressure-releasing section connected in sequence from the inside of the anchor hole to the outside of the anchor hole. The grouting section and the anchoring section are located in the anchor hole, and the pressure-releasing section is located outside the anchor hole. A grouting hole is provided on the side wall of the grouting section, and the grouting hole is connected to the hollow structure.

[0008] An anchoring auxiliary part, comprising: an extension rod, which is arranged at the end of the grouting section along the length direction of the anchor rod; two grouting plugs, which are respectively arranged on the grouting section and located near the ends of both ends of the grouting section, the grouting plug near the extension rod is used to close the anchor hole space where the extension rod is located as an initial anchoring area, and the two grouting plugs are used to close the anchor hole between the grouting plugs as a secondary anchoring area;

[0009] An anchoring assembly, arranged in the anchoring section, used to connect with the inner wall of the anchor hole to realize anchoring of the anchor rod;

[0010] The pallet piece is inserted into the yielding section;

[0011] The yielding component is a deformable structure, which is arranged in the yielding section, located on the side of the pallet component away from the anchor hole, and close to the side of the pallet component away from the anchor hole. The yielding component uses its own deformation to offset the pressure generated by squeezing the pallet component after the surrounding rock undergoes large deformation.

[0012] Furthermore, a connecting sleeve is provided at the end of the grouting section, and the extension rod is provided on the connecting sleeve.

[0013] Furthermore, the anchoring assembly comprises:

[0014] A fixed sleeve, which is sleeved on the outer wall of the anchoring section;

[0015] A sliding sleeve is slidably arranged on the outer wall of the fixed sleeve, and the length of the fixed sleeve is longer than that of the sliding sleeve;

[0016] There is at least one cutter bar, one end of which is hinged to the side of the fixed sleeve close to the grouting section, and the other end is used to be inserted into the inner wall of the anchor hole;

[0017] There is at least one push-pull rod, which corresponds to the cutter rod one by one. One end of the push-pull rod is hinged to the side of the sliding sleeve close to the grouting section, and the other end is hinged to the cutter rod. When the sliding sleeve moves, the push-pull rod drives the cutter rod to insert into the inner wall of the anchor hole to realize opening and closing.

[0018] The first elastic member has one end arranged on a side of the fixed sleeve away from the grouting section, and the other end arranged on a side of the sliding sleeve away from the grouting section.

[0019] Furthermore, the anchoring assembly also includes a limiting member, which is arranged on the fixed sleeve and connected to the sliding sleeve, and is used to put the first elastic member in a compressed state.

[0020] Furthermore, a sliding groove is provided on the side wall of the fixed sleeve, and the sliding sleeve is sleeved in the sliding groove.

[0021] Furthermore, the pressure-releasing component comprises:

[0022] A first plate body is inserted into the pressure relief section, and one side of the first plate body is in close contact with the pallet member;

[0023] A second elastic member is disposed on the first plate and is located on a side of the first plate that is opposite to the tray member;

[0024] A second plate body is disposed on the pressure-releasing section, and one side of the second plate body is connected to the other end of the second elastic member;

[0025] The fastener is arranged on the pressure-releasing section and is in close contact with the opposite side of the second plate body connected to the second elastic member.

[0026] Furthermore, the pallet element comprises:

[0027] The disc body is penetrated on the pressure-relief section and is close to the rock surrounding the anchor hole;

[0028] The high-strength cushion layer is passed through the pressure-releasing section, with one side close to the disc body and the opposite side close to the first plate body.

[0029] Furthermore, the method for using the anti-anchoring pressure anchor device comprises the following steps:

[0030] Wind the anchoring agent cement roll and curing agent roll on the extension rod, then insert the anchor rod, anchoring auxiliary parts and anchoring assembly into the anchor hole, rotate the anchor rod to make the anchoring agent cement roll and curing agent roll rotate and stir, then connect the anchor assembly with the inner wall of the anchor hole to realize anchoring of the anchor rod, and complete the anchoring of the initial anchoring area after the anchoring agent is completely cured;

[0031] The pallet component and the pressure-releasing assembly are sequentially sleeved on the pressure-releasing section, so that the side of the pallet component close to the anchor hole is closely attached to the anchor hole;

[0032] If the surrounding rock deforms during use, causing the anchoring agent binder and the extension rod in the initial anchoring area to become unanchored, the secondary anchoring area is grouted through the anchor rod to complete the secondary anchoring.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention realizes the division of the initial anchoring area and the secondary anchoring area in the anchor hole by cooperating with the anchor rod and the anchoring auxiliary part, and can realize the secondary reinforcement by two anchorings in use. Moreover, when the anchoring agent is not solidified, the anchoring device is used to prevent the movement of the anchor rod and can produce a large elongation deformation to meet the requirements of large deformation of the surrounding rock, which makes up for the defects of the existing yielding anchor rod that cannot prevent the movement of the anchor rod when the anchoring agent is not solidified and the secondary reinforcement through the hollow anchor rod when the anchoring agent is not solidified. Furthermore, by adding a yielding assembly to the yielding section, when the surrounding rock is deformed, it can deform with the surrounding rock within the allowable range to meet the requirements of large deformation of the surrounding rock, and ensure that the anchor rod and the anchoring structure are not damaged. The present invention has the advantages of diverse functions, reasonable structure, economic applicability, etc., and the deformation yielding function of the anchor rod can effectively reduce the occurrence of accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention;

[0036] Figure 2 is a schematic structural diagram of the anchor assembly of the present invention;

[0037] Figure 3 It is a partial structural schematic diagram of the pressure-yielding component of the present invention.

[0038] Among them, 1-anchor rod, 11-grouting section, 110-connecting sleeve, 12-anchoring section, 13-pressure-releasing section, 2-anchoring auxiliary part, 21-extension rod, 22-grouting plug, 3-anchoring assembly, 31-fixed sleeve, 310-slide groove, 32-sliding sleeve, 33-knife rod, 34-push-pull rod, 35-first elastic part, 36-limiting part, 4-tray part, 41-tray body, 42-high-strength cushion layer, 5-pressure-releasing assembly, 51-first plate body, 52-second elastic part, 53-second plate body, 54-fastener. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 To the attached Figure 3 , the specific implementation methods of the present invention are described in detail. In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] Example

[0042] like Figure 1 The illustrated embodiment shows an anti-anchoring and pressure-releasing anchor rod device capable of secondary grouting, comprising an anchor rod 1, an anchoring auxiliary component 2, an anchoring assembly 3, a tray component 4 and a pressure-releasing assembly 5.

[0043] The anchor rod 1 is a hollow structure for being inserted into an anchor hole. The anchor rod 1 includes a grouting section 11, an anchoring section 12, and a pressure-releasing section 13 which are connected in sequence from the inside of the anchor hole toward the outside of the anchor hole. The grouting section 11 and the anchoring section 12 are located inside the anchor hole, and the pressure-releasing section 13 is located outside the anchor hole. Grouting holes are provided on the side wall of the grouting section 11, and the grouting holes are connected to the hollow structure.

[0044] The anchoring auxiliary part 2 includes an extension rod 21 and two grouting plugs 22. The extension rod 21 is arranged at the end of the grouting section 11 along the length direction of the anchor rod 1; the two grouting plugs 22 are respectively arranged on the grouting section 11 and are located near the ends of the grouting section 11. The grouting plug 22 near the extension rod 21 is used to close the anchor hole space where the extension rod 21 is located as the initial anchoring area, and the two grouting plugs 22 are used to close the anchor hole between the grouting plugs 22 as the secondary anchoring area.

[0045] The anchoring assembly 3 is arranged in the anchoring section 12, and is used to connect with the inner wall of the anchor hole to realize the anchoring of the anchor rod 1. The pallet component 4 is passed through the pressure-releasing section 13. The pressure-releasing assembly 5 is a deformable structure, and is arranged in the pressure-releasing section 13. It is located on the side of the pallet component 4 away from the anchor hole, and is close to the side of the pallet component 4 away from the anchor hole. The pressure-releasing assembly 5 uses its own deformation to offset the pressure generated by squeezing the pallet component 4 after the surrounding rock undergoes a large deformation.

[0046] Preferably, a connecting sleeve 110 is provided at the end of the grouting section 11 , and the extension rod 21 is provided on the connecting sleeve 110 .

[0047] Preferably, Figure 2 As shown, the anchoring assembly 3 includes a fixed sleeve 31 , a sliding sleeve 32 , a knife rod 33 , a push-pull rod 34 and a first elastic member 35 .

[0048] The fixed sleeve 31 is sleeved on the outer wall of the anchoring section 12, and the sliding sleeve 32 is slidably arranged on the outer wall of the fixed sleeve 31. The length of the fixed sleeve 31 is longer than that of the sliding sleeve 32. There is at least one knife rod 33, one end of which is hinged on the side of the fixed sleeve 31 close to the grouting section 11, and the other end is used to be inserted into the inner wall of the anchor hole. There is at least one push-pull rod 34, which corresponds to the knife rod 33 one by one. One end of the push-pull rod 34 is hinged on the side of the sliding sleeve 32 close to the grouting section 11, and the other end is hinged on the knife rod 33. When the sliding sleeve 32 moves, the push-pull rod 34 drives the knife rod 33 to be inserted into the inner wall of the anchor hole to realize opening and closing. One end of the first elastic member 35 is arranged on the side of the fixed sleeve 31 away from the grouting section 11, and the other end is arranged on the side of the sliding sleeve 32 away from the grouting section 11.

[0049] Preferably, the anchoring assembly 3 further includes a limiting member 36 , which is disposed on the fixed sleeve 31 and connected to the sliding sleeve 32 , and is used to place the first elastic member 35 in a compressed state.

[0050] Preferably, a sliding groove 310 is provided on the side wall of the fixed sleeve 31 , and the sliding sleeve 32 is sleeved in the sliding groove 310 .

[0051] like Figure 2 As shown, the fixed sleeve 31 is sleeved on the anchoring section 12, which is provided with a slide groove 310, and the sliding sleeve 32 is slidably sleeved inside the slide groove 310. The tail of each knife rod 33 is hinged on the fixed sleeve 31, and is provided on the sliding sleeve 32 through a push-pull rod 34, forming an umbrella-shaped skeleton structure as a whole. The knife rod 33 opens and closes as the sliding sleeve 32 slides in the slide groove 310. When the sliding sleeve 32 slides to a direction close to the knife rod 33, the knife rod 33 is opened and its end is inserted into the inner wall of the anchor hole. When the sliding sleeve 32 slides to a direction away from the knife rod 33, the knife rod 33 is retracted to avoid contact with the inner wall of the anchor hole. The limiting member 36 is used to limit the sliding position of the sliding sleeve 32, because the knife rod 33 must be in a retracted state during installation. After being inserted into the preset position in the anchor hole, the limiting member 36 on the sliding sleeve 32 is disconnected, and the sliding sleeve 32 is affected by the rebound of the first elastic member 35 and moves toward the side close to the knife rod 33, thereby driving the knife rod 33 to expand so that its end is inserted into the inner wall of the anchor hole.

[0052] It should be noted that: Figure 2As shown, the first elastic member 35 is a commercially available spring. The limiter 36 is a connecting rod, one end of which is hinged on the sliding sleeve 32, and the other end is curved. The fixed sleeve 31 is provided with a pin for hanging the curved end. In the initial state, the curved end of the limiter 36 is hung on the pin, and the first elastic member 35 is in a compressed state. After the anchor rod 1, the anchor auxiliary member 2, and the anchor assembly 3 are inserted into the preset position in the anchor hole, the curved end of the limiter 36 is removed from the pin. At this time, the sliding sleeve 32 is affected by the rebound of the first elastic member 35 and moves toward the side close to the knife rod 33.

[0053] Preferably, Figure 1 , Figure 3 As shown, the pressing assembly 5 includes a first plate body 51 , a second elastic member 52 , a second plate body 53 and a fastener 54 .

[0054] The first plate 51 is inserted through the pressure-releasing section 13, one side of the first plate 51 is in close contact with the pallet member 4, the second elastic member 52 is arranged on the first plate 51, and is located on the opposite side of the first plate 51 in close contact with the pallet member 4, the second plate 53 is inserted through the pressure-releasing section 13, one side of the second plate 53 is connected to the other end of the second elastic member 52, and the fastener 54 is arranged on the pressure-releasing section 13, and is in close contact with the opposite side of the second plate 53 connected to the second elastic member 52. Among them, the outer wall of the pressure-releasing section 13 is provided with threads, and the fastener 54 is a commercially available nut.

[0055] Preferably, the tray member 4 includes a tray body 41 and a high-strength cushion layer 42. The tray body 41 is arranged on the pressure-releasing section 13 and is close to the rock around the anchor hole. The high-strength cushion layer 42 is arranged on the pressure-releasing section 13, with one side close to the tray body 41 and the opposite side close to the first plate body 51.

[0056] The method for using the anti-anchoring pressure anchor rod device proposed in this embodiment includes the following steps:

[0057] Drill anchor holes at pre-marked positions of surrounding rocks, and install anchoring auxiliary components 2 and anchoring components 3 on anchor rods 1. Check whether the limiting component 36 makes the first elastic component 35 in a compressed state. If not, adjust the first elastic component 35 to a compressed state through the limiting component 36. That is, ensure that each shank 33 is in a closed state close to the fixed sleeve 31.

[0058] The anchoring agent glue roll and the curing agent roll are wound around the extension rod 21, and then the anchor rod 1, the anchoring auxiliary part 2, and the anchoring assembly 3 are inserted into the anchor hole.

[0059] Connect the agitator to the end of the pressure-releasing section 13 exposed outside the anchor hole, drive the anchor rod 1 to rotate through the agitator, and then drive the extension rod 21 to rotate, stir the anchoring agent mortar roll and the curing agent roll, and after sufficient stirring, open the limiter 36, the first elastic member 35 in the compressed state resets and pushes the sliding sleeve 32 to slide on the fixed sleeve 31, and then drives the knife rod 33 to open and penetrate into the surrounding rock on the inner wall of the anchor hole. At this time, the anchor assembly 3 can effectively prevent the anchor rod 1 from moving to the outside of the anchor hole, thereby effectively avoiding the problem of unanchoring when the anchoring agent is not completely solidified. After the anchoring agent is completely solidified, the anchoring of the initial anchoring area is completed.

[0060] The disc body 41, the high-strength cushion layer 42, the first plate body 51, and the second elastic member 52 are sequentially sleeved on the pressure-releasing section 13, and then the second elastic member 52 is installed between the first plate body 51 and the second elastic member 52, and the fastener 54 is installed on the pressure-releasing section 13, and the first plate body 51 is closely attached to the surrounding rock around the anchor hole by adjusting the actual position of the fastener 54 on the pressure-releasing section 13. In addition, the compression state of the second elastic member 52 can also be adjusted by adjusting the actual position of the fastener 54 on the pressure-releasing section 13.

[0061] If the surrounding rock deforms during use, causing the anchoring agent cement body and the extension rod 21 in the initial anchoring area to become unanchored, the secondary anchoring area is grouted through the anchor rod 1 to complete the secondary anchoring.

[0062] When the surrounding rock deforms and squeezes the first plate 51, the first plate 51 will further transmit force to the second elastic member 52, and the second elastic member 52 will be compressed and deformed to adapt to the high ground pressure environment and give full play to the self-bearing capacity of the surrounding rock. In addition, the actual deformation degree of the surrounding rock 1 can also be judged by observing the compression difference of the second elastic member 52.

[0063] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. An anti-anchoring pressure-releasing anchor rod device capable of secondary grouting, characterized in that: include: The anchor rod (1) is a hollow structure and is used to be inserted into an anchor hole. The anchor rod (1) comprises a grouting section (11), an anchoring section (12), and a pressure relief section (13) which are connected in sequence. A grouting hole is provided on the side wall of the grouting section (11), and the grouting hole is connected to the hollow structure. An anchoring auxiliary component (2) comprises: an extension rod (21) arranged at the end of the grouting section (11) along the length direction of the anchor rod (1); two grouting plugs (22), the two grouting plugs (22) being arranged on the grouting section (11) and located near the two end portions of the grouting section (11), the grouting plug (22) near the extension rod (21) being used to close the anchor hole space where the extension rod (21) is located as an initial anchoring area, and the two grouting plugs (22) being used to close the anchor hole between the grouting plugs (22) as a secondary anchoring area; An anchoring assembly (3), arranged in the anchoring section (12), and used to connect with the inner wall of the anchor hole to achieve anchoring of the anchor rod (1); A tray member (4) is inserted into the pressure-releasing section (13); The pressure-releasing component (5) is a deformable structure and is arranged in the pressure-releasing section (13). The pressure-releasing component (5) uses its own deformation to offset the pressure generated by squeezing the tray component (4) after the surrounding rock undergoes a large deformation.

2. The anchor rod device capable of secondary grouting according to claim 1, characterized in that: A connecting sleeve (110) is provided at the end of the grouting section (11), and the extension rod (21) is arranged on the connecting sleeve (110).

3. The anchor rod device capable of secondary grouting according to claim 1, characterized in that: The anchoring assembly (3) comprises: A fixing sleeve (31) is sleeved on the outer wall of the anchoring section (12); A sliding sleeve (32) is slidably disposed on the outer wall of the fixed sleeve (31), and the length of the fixed sleeve (31) is longer than the length of the sliding sleeve (32); At least one cutter bar (33) has one end hinged to a side of the fixed sleeve (31) close to the grouting section (11); There is at least one push-pull rod (34) corresponding to the knife rod (33). One end of the push-pull rod (34) is hinged to the side of the sliding sleeve (32) close to the grouting section (11), and the other end is hinged to the knife rod (33). When the sliding sleeve (32) moves, the push-pull rod (34) drives the knife rod (33) to open and close. The first elastic member (35) has one end arranged on a side of the fixed sleeve (31) away from the grouting section (11), and the other end arranged on a side of the sliding sleeve (32) away from the grouting section (11).

4. The anchor rod device capable of secondary grouting as claimed in claim 3, characterized in that: The anchoring assembly (3) further comprises a limiting member (36), which is arranged on the fixed sleeve (31) and connected to the sliding sleeve (32) and is used to place the first elastic member (35) in a compressed state.

5. The anchor rod device capable of secondary grouting as claimed in claim 3, characterized in that: A sliding groove (310) is provided on the side wall of the fixed sleeve (31), and the sliding sleeve (32) is sleeved in the sliding groove (310).

6. The anchor rod device capable of secondary grouting as claimed in claim 1, characterized in that: The pressure-releasing component (5) comprises: A first plate body (51) is inserted into the pressure-releasing section (13), and one side of the first plate body (51) is in close contact with the tray member (4); A second elastic member (52) is arranged on the first plate body (51) and is located on a side of the first plate body (51) opposite to the tray member (4); A second plate body (53) is inserted into the pressure-releasing section (13), and one side of the second plate body is connected to the other end of the second elastic member (52); The fastener (54) is arranged on the pressure-releasing section (13) and is in close contact with the side of the second plate (53) opposite to the side where the second elastic member (52) is connected.

7. The anchor rod device capable of secondary grouting as claimed in claim 6, characterized in that: The pallet element (4) comprises: The disc body (41) is inserted into the pressure-releasing section (13); The high-strength cushion layer (42) is penetrated on the pressure-releasing section (13), with one side closely attached to the disc body (41) and the opposite side closely attached to the first plate body (51).

8. The method for using the anti-anchoring pressure-releasing anchor rod device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Winding the anchoring agent glue roll and the curing agent roll on the extension rod (21), then inserting the anchor rod (1), the anchoring auxiliary component (2), and the anchoring assembly (3) into the anchor hole, rotating the anchor rod (1) to cause the anchoring agent glue roll and the curing agent roll to rotate and stir, and then connecting the anchoring assembly (3) to the inner wall of the anchor hole to achieve anchoring of the anchor rod (1), and completing the anchoring of the initial anchoring area after the anchoring agent is completely cured; The pallet member (4) and the pressure-releasing assembly (5) are sequentially sleeved on the pressure-releasing section (13), so that the side of the pallet member (4) close to the anchor hole is closely attached to the anchor hole; If the surrounding rock deforms during use, causing the anchoring agent cement body and the extension rod (21) in the initial anchoring area to become unanchored, grouting is performed in the secondary anchoring area through the anchor rod (1) to complete the secondary anchoring.

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