Grouting anchor rod assisting in fixing hole center

Abstract

The invention belongs to the technical field of anchor rods, and provides a grouting anchor rod assisting in fixing the center of a hole, the grouting anchor rod comprises a drill rod, a connector located at the bottom of the drill rod, a steel strand located in the drill rod and an anchoring head located at the bottom of the connector, one end of the drill rod is in threaded connection with the connector, a plurality of first inclined sliding grooves are formed in the inner wall of the drill rod, and a plurality of second inclined sliding grooves are formed in the inner wall of the connector. The adjusting sliding block is moved out of the second inclined sliding groove, the torsion springs and the first elastic piece are relieved at the same time, so that the adjusting sliding block is attached to the inner wall of the fixing hole, the elastic coefficient of the multiple torsion springs is the same as that of the first elastic piece, the stress conditions of the multiple torsion springs and the first elastic piece are the same, and the adjusting sliding block is more stable. Thus, the steel strand is limited in the center of the fixing hole, and the problems that when the anchor rod is not located in the center of the fixing hole, the anchoring force of the anchor rod is reduced, the anchoring effect of the anchor rod is uneven, the stress of the anchor rod is asymmetric, and the system stability is reduced are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of anchor bolts, and specifically relates to a grouting anchor bolt for assisting in fixing the center of a hole. Background Art

[0002] The technical background in the field of anchor bolts can be traced back to the 19th century. As an important geotechnical reinforcement technology, it has demonstrated excellent performance and broad application prospects in multiple engineering fields. The anchor bolt technology originated from the support requirements of underground roadways and has gradually expanded to coal mines, metal mines, water conservancy, tunnels, and other underground projects.

[0003] Its basic principle is to overcome the disadvantage that the tensile capacity of geotechnical bodies is much lower than the compressive capacity through the longitudinal tensile action of the anchor bolt body, thereby enhancing the stability and bearing capacity of geotechnical bodies. One end of the anchor bolt is connected to the engineering structure, and the other end penetrates deep into the formation, forming two parts: a free section and an anchorage section. The free section is responsible for transmitting the tension at the anchor bolt head to the anchor body, applying prestress to the anchor bolt, while the anchorage section bonds the prestressed tendon to the soil layer through the cement slurry to further increase the bonding friction between the anchor body and the soil layer, ensuring that the tension can be deeply transmitted to the deep soil layer. In the development process of the anchor bolt technology, important contributions have been made by different countries and regions.

[0004] The existing patent (Patent Publication No.: CN113294189B) discloses a grouting anchor bolt, which belongs to the technical field of drilling and grouting in mines and geotechnical engineering, aiming to solve the problems of poor anchoring performance of existing grouting anchor bolts and the lack of a self - contained grouting stop structure; it includes an anchor head, an anchor bolt body, a conical grouting stop plug, a backing plate, and a fastening nut. It is characterized in that it further includes an expansion assembly, the expansion assembly is arranged inside the anchor bolt body, the expansion assembly includes a tying rod, an expansion grouting stop sleeve, an inner crack pipe, and a piston assembly, the inner crack pipe is arranged inside the anchor bolt body; several tying rods are arranged on the outer side surface of the inner crack pipe, several expansion grouting stop sleeves are fixedly arranged on the outer side surface of the anchor bolt body, the piston assembly includes an expansion push block and a push rod, and the expansion push block is fixedly arranged at one end of the push rod. In the design of the present invention, after the slurry solidifies, multiple connections between the grouting body and the anchor bolt are fully formed into a whole; the anchoring performance is better, with a self - contained grouting stop structure, multiple - point sectional grouting stop, and the pressure at the conical grouting stop plug is relieved.

[0005] In the process of implementing the above - mentioned scheme, the inventor found that the following problems exist in the existing technology and have not been solved: Most of the existing technologies are unable to install the anchor bolt at the center of the drill hole, resulting in:

[0006] The anchoring force of the anchor bolt is reduced: Although the anchoring force of the anchor bolt when it is in the center of the drill hole is slightly greater than that when it is not in the center of the drill hole, the difference is usually not significant. However, this small difference may become significant under extreme working conditions, affecting the overall anchoring effect of the anchor bolt.

[0007] The uneven anchoring effect of the bolt: When the bolt is not installed at the center of the drill hole, the stress on the anchoring agent and the surrounding rock of the drill hole will become uneven, which may cause the corresponding parts around the anchoring agent or the surrounding rock to be damaged out of sync when stressed, thereby reducing the integrity and reliability of the anchoring effect.

[0008] The asymmetric stress of the bolt: The non-centering of the bolt will cause its stress to be asymmetric, generating an additional bending moment. This bending moment will reduce the support strength of the bolt and the stability of the support system, making the bolt more likely to be damaged when bearing external forces.

[0009] The decline of system stability: The stability of the bolt support system depends on the synergy between bolts. When some bolts are unevenly stressed due to not being installed at the center of the drill hole, the stability of the entire support system will also be affected, which may trigger a chain reaction and lead to the overall failure of the support system. Summary of the Invention

[0010] A grouting bolt for assisting in fixing the hole center, comprising a drill rod, a connector located at the bottom of the drill rod, a steel strand located inside the drill rod, and an anchoring head located at the bottom of the connector. One end of the drill rod is threadedly connected to the connector. Among them, multiple first inclined chutes are provided on the inner wall of the drill rod, multiple second inclined chutes are provided on the inner wall of the connector, the first inclined chutes are communicated with the second inclined chutes, multiple adjusting components are provided on the steel strand, and a clamping member is provided at one end of the steel strand.

[0011] The adjusting component includes a first limiting ring fixed on the steel strand. A "T"-shaped chute is provided on the first limiting ring. A connecting ring is slidably connected in the "T"-shaped chute. An adjusting ring is fixedly connected to the connecting ring. Multiple limiting blocks are symmetrically and fixedly connected to the adjusting ring. A connecting shaft is provided between the symmetrically arranged limiting blocks. The connecting shaft is fixedly connected to the limiting blocks. An adjusting leg is connected to the connecting shaft through a torsion spring. One end of the adjusting leg is located in the first inclined chute.

[0012] Preferably, a plurality of first docking blocks are fixedly connected to the bottom of the connector, a plurality of second docking blocks are fixedly connected to the top of the anchoring head, and the first docking blocks and the second docking blocks are meshed with each other.

[0013] Preferably, a plurality of limiting rods are provided between adjacent adjusting rings. Stirring plates are fixedly connected to the plurality of limiting rods. Both ends of the plurality of limiting rods are fixedly connected to the adjacent adjusting rings respectively.

[0014] Preferably, the adjusting leg includes a sleeve. The sleeve is connected to the connecting shaft through a torsion spring. A first elastic member is provided inside the sleeve. One end of the first elastic member is fixedly connected to the inner wall of the sleeve, and the other end of the first elastic member is fixedly connected to an adjusting rod.

[0015] Preferably, one end of the adjusting rod extends out of the sleeve, and one end of the adjusting rod extending out of the sleeve is connected with an adjusting slider through a universal joint, and the adjusting slider is located in the first inclined chute.

[0016] Preferably, the engaging member includes a limiting plate, the limiting plate is fixedly connected to one end of the steel strand, a second limiting ring is fixedly connected to the limiting plate, and limiting sliders are symmetrically and fixedly connected to the second limiting ring.

[0017] Preferably, a receiving hole is vertically formed in the anchoring head, first, second, and third chutes are vertically and symmetrically formed in the inner wall of the receiving hole, one end of the second chute communicates with the first chute, and the other end of the second chute communicates with the third chute.

[0018] Preferably, a conical head is fixedly connected to the bottom of the anchoring head, limiting holes are vertically formed in the bottom of the inner wall of the receiving hole and the top of the conical head, a second elastic member is arranged in the limiting hole, one end of the second elastic member is fixedly connected to the bottom of the inner wall of the limiting hole, and the other end of the second elastic member extends into the receiving hole.

[0019] Preferably, a third inclined chute is formed in the anchoring head, and a threaded bar is fixedly connected in the third inclined chute.

[0020] Preferably, a slope is formed at the top of the anchoring head, and the slope communicates with the receiving hole.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By moving the adjusting slider out of the second inclined chute, the torsion spring and the first elastic member are simultaneously relieved of force, so that the adjusting slider fits against the inner wall of the fixing hole. Also, since the elastic coefficients of the multiple torsion springs and the first elastic members are the same, the multiple torsion springs and the first elastic members are equally stressed, thus limiting the steel strand at the center position of the fixing hole, and solving the problems of reduced anchoring force of the anchor rod, uneven anchoring effect of the anchor rod, asymmetric force on the anchor rod, and decreased system stability when the anchor rod is not at the center of the fixing hole.

[0023] 2. By moving the adjusting slider along the first inclined chute and the second inclined chute, the adjusting slider drives the adjusting ring to rotate through the adjusting rod, the sleeve, the connecting shaft, and the limiting block, thereby driving the limiting rod and the stirring plate to rotate, and further stirring the grouting liquid to avoid local solidification of the grouting liquid first and thus the occurrence of stratification.

[0024] 3. After the present invention rotates the steel strand to make the limit slider enter the third chute along the second chute, it stops extending the steel strand into the drill pipe, reducing the force on the second elastic member, thereby pushing the limit slider into the third chute, thus completing the engagement between one end of the steel strand and the anchoring head, fixing the steel strand, and reducing the probability of the steel strand and the anchoring head detaching during subsequent grouting.

[0025] 4. During the process of the anchoring head drilling in the rock and soil, the conical head fixedly connected to one end of the anchoring head and the threaded strips in the third inclined chute formed on the surface of the anchoring head assist the anchoring head in drilling in the rock and soil, improving the drilling efficiency of the anchoring head. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 is a schematic diagram of the structure of the drill pipe and the connector of the present invention.

[0028] Figure 3 is a schematic diagram of the structure of the connector of the present invention.

[0029] Figure 4 is a schematic diagram of the structure of the steel strand, the adjusting assembly and the engaging member of the present invention.

[0030] Figure 5 is a schematic diagram of the structure of the adjusting assembly of the present invention.

[0031] Figure 6 is a partially exploded schematic diagram of the structure of the adjusting assembly of the present invention.

[0032] Figure 7 is a schematic diagram of the structure of the engaging member of the present invention.

[0033] Figure 8 is a schematic diagram of the structure of the anchoring head of the present invention.

[0034] Figure 9 is a sectional schematic diagram of the structure of the anchoring head of the present invention.

[0035] In the figure: 1. Drill pipe; 11. First inclined chute; 2. Connector; 21. Second inclined chute; 22. First docking block; 3. Steel strand; 31. Adjusting assembly; 311. First limiting ring; 312. "T"-shaped chute; 313. Connecting ring; 314. Adjusting ring; 315. Limiting block; 316. Connecting shaft; 317. Adjusting leg; 318. Limiting rod; 319. Stirring plate; 3171. Sleeve; 3172. First elastic member; 3173. Adjusting rod; 3174. Adjusting slider; 32. Engaging member; 321. Limiting plate; 322. Second limiting ring; 323. Limiting slider; 4. Anchor head; 41. Second docking block; 42. Accommodating hole; 43. First chute; 44. Second chute; 45. Third chute; 46. Tapered head; 47. Limiting hole; 48. Second elastic member; 49. Third inclined chute; 410. Threaded strip; 411. Slope. Detailed implementation manners

[0036] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0037] The present invention provides a grouting bolt for assisting in fixing the center of a hole, including a drill pipe 1 that drives the connector 2 to rotate, a connector 2 located at the bottom of the drill pipe 1 that drives the anchor head 4 to rotate, a steel strand 3 located inside the drill pipe 1 for strengthening the rock and soil, and an anchor head 4 located at the bottom of the connector 2 that rotates following the connector 2. One end of the drill pipe 1 is threadedly connected to the connector 2. Among them, a plurality of first inclined chutes 11 for limiting the adjusting slider 3174 are provided on the inner wall of the drill pipe 1, a plurality of second inclined chutes 21 for limiting the adjusting slider 3174 are provided on the inner wall of the connector 2, the first inclined chute 11 communicates with the second inclined chute 21, a plurality of adjusting assemblies 31 for adjusting the position of the steel strand 3 inside the fixed hole are provided on the steel strand 3, and an engaging member 32 for fixing one end of the steel strand 3 is provided at one end of the steel strand 3.

[0038] The adjusting assembly 31 includes a first limiting ring 311 fixed to the steel strand 3 to bear the connecting ring 313. A "T"-shaped sliding groove 312 for accommodating the connecting ring 313 is formed in the first limiting ring 311. A connecting ring 313 that slidably connects the first limiting ring 311 and the adjusting ring 314 is arranged in the "T"-shaped sliding groove 312. An adjusting ring 314 for adjusting the position of the steel strand 3 in the fixing hole is fixedly connected to the connecting ring 313. A plurality of limiting blocks 315 for limiting the connecting shaft 316 are symmetrically and fixedly connected to the adjusting ring 314. A connecting shaft 316 for limiting the adjusting leg 317 is arranged between the symmetrically arranged limiting blocks 315. The connecting shaft 316 is fixedly connected to the limiting blocks 315. An adjusting leg 317 for adjusting the position of the steel strand 3 in the fixing hole is connected to the connecting shaft 316 through a torsion spring. One end of the adjusting leg 317 is located in the first inclined sliding groove 11.

[0039] It should be noted that: one, two, three or more adjusting assemblies 31 can be provided, and the specific number can be increased or decreased according to the depth of the fixing hole. Figure 4 Only 4 are taken as an example here.

[0040] A plurality of first docking blocks 22 for enabling the anchoring head 4 to rotate following the connecting head 2 are fixedly connected to the bottom of the connecting head 2. A plurality of second docking blocks 41 for enabling the anchoring head 4 to rotate following the connecting head 2 are fixedly connected to the top of the anchoring head 4. The first docking blocks 22 and the second docking blocks 41 are meshed with each other. A plurality of limiting rods 318 connecting adjacent adjusting rings 314 are arranged between adjacent adjusting rings 314. Stirring plates 319 for stirring the grouting liquid are fixedly connected to all the plurality of limiting rods 318. Both ends of the plurality of limiting rods 318 are fixedly connected to the adjacent adjusting rings 314 respectively.

[0041] The adjusting leg 317 includes a sleeve 3171 for accommodating a first elastic member 3172. The sleeve 3171 is connected to the connecting shaft 316 through a torsion spring. A first elastic member 3172 for pushing the adjusting rod 3173 to move is arranged in the sleeve 3171. One end of the first elastic member 3172 is fixedly connected to the inner wall of the sleeve 3171. The other end of the first elastic member 3172 is fixedly connected to an adjusting rod 3173 for adjusting the position of the steel strand 3 in the fixing hole. One end of the adjusting rod 3173 extends out of the sleeve 3171. One end of the adjusting rod 3173 extending out of the sleeve 3171 is connected through a universal joint to an adjusting slider 3174 for limiting one end of the adjusting rod 3173. The adjusting slider 3174 is located in the first inclined sliding groove 11.

[0042] The engaging member 32 includes a limiting plate 321 for limiting one end of the steel strand 3. The limiting plate 321 is fixedly connected to one end of the steel strand 3. A second limiting ring 322 for limiting one end of the steel strand 3 is fixedly connected to the limiting plate 321. Limiting sliders 323 for limiting the second limiting ring 322 are symmetrically and fixedly connected to the second limiting ring 322. A receiving hole 42 for receiving the engaging member 32 is vertically formed in the anchoring head 4. First chutes 43, second chutes 44 and third chutes 45 for receiving the limiting sliders 323 are symmetrically and vertically formed in the inner wall of the receiving hole 42. One end of the second chute 44 communicates with the first chute 43, and the other end of the second chute 44 communicates with the third chute 45.

[0043] A conical head 46 facilitating the drilling of the anchoring head 4 into the rock and soil is fixedly connected to the bottom of the anchoring head 4. Limiting holes 47 for receiving a second elastic member 48 are vertically formed in the bottom of the inner wall of the receiving hole 42 and the top of the conical head 46. A second elastic member 48 that moves the engaging member 32 through elastic deformation is arranged in the limiting hole 47. One end of the second elastic member 48 is fixedly connected to the bottom of the inner wall of the limiting hole 47, and the other end of the second elastic member 48 extends into the receiving hole 42. A third inclined chute 49 for receiving a threaded bar 410 is formed in the anchoring head 4. The threaded bar 410 facilitating the drilling of the anchoring head 4 into the rock and soil is fixedly connected in the third inclined chute 49. A slope 411 facilitating the entry of the engaging member 32 into the receiving hole 42 is formed at the top of the anchoring head 4. The slope 411 communicates with the receiving hole 42.

[0044] It should be noted that: The first elastic member 3172 and the second elastic member 48 are preferably springs or dampers, etc. Assembly personnel can select and match according to factors such as manufacturing cost and reinforcement strength, Figure 6 and Figure 9 only the spring is taken as an example herein.

[0045] Embodiment 1: As Figures 1 to 9 shown, in this embodiment, during use, first rotate the connecting head 2 so that the connecting head 2 is threadedly connected to one end of the drill pipe 1. Then, a plurality of first docking blocks 22 fixedly connected to the bottom of the connecting head 2 are engaged with a plurality of second docking blocks 41 fixedly connected to the top of the anchoring head 4 one by one. When the drilling rig drives the connecting head 2 and the drill pipe 1 to rotate, the anchoring head 4 is driven to rotate synchronously, so that the anchoring head 4 drills into the rock and soil.

[0046] It should be noted that: During the process of the anchoring head 4 drilling into the rock and soil, the conical head 46 fixedly connected to one end of the anchoring head 4 and the threaded bar 410 in the third inclined chute 49 formed on the surface of the anchoring head 4 assist the anchoring head 4 in drilling into the rock and soil, improving the drilling efficiency of the anchoring head 4.

[0047] When the anchoring head 4 drills to the specified depth, one end of the steel strand 3 provided with the engaging member 32 is inserted along one end of the drill pipe 1. While inserting the steel strand 3, the sleeve 3171 is moved to make the torsion spring rotate under force, and at the same time, the adjusting slider 3174 is pressed to make the first elastic member 3172 compressed under force, and the adjusting slider 3174 is placed in the first inclined chute 11. Since the elastic coefficients of multiple torsion springs and the first elastic member 3172 are the same, the force conditions of multiple torsion springs and the first elastic member 3172 are equal, so that the steel strand 3 is limited to the central position of the drill pipe 1, facilitating the subsequent engagement of the engaging member 32 with the anchoring head 4.

[0048] It should be noted that: during the continuous insertion of the steel strand 3 into the drill pipe 1, the adjusting slider 3174 moves along the first inclined chute 11 and the second inclined chute 21. Since the "T"-shaped chute 312 is opened on the first limiting ring 311 and the connecting ring 313 is slidably connected in the "T"-shaped chute 312, during the process of the adjusting slider 3174 moving along the first inclined chute 11 and the second inclined chute 21, the steel strand 3 does not rotate with the drill pipe 1 and the connecting head 2, avoiding the situation where the engaging member 32 cannot be docked with the anchoring head 4.

[0049] When the limiting slider 323 in the engaging member 32 moves to the first chute 43 vertically opened on the inner wall of the receiving hole 42, the steel strand 3 is continuously pushed into the drill pipe 1, so that the limiting slider 323 enters the second chute 44 along the first chute 43.

[0050] It should be noted that: during the process of the limiting slider 323 entering the second chute 44 along the first chute 43, the limiting plate 321 in the engaging member 32 contacts one end of the second elastic member 48 extending into the receiving hole 42, so that the second elastic member 48 is compressed under force.

[0051] After the limiting slider 323 completely enters the second chute 44, the steel strand 3 is rotated to make the limiting slider 323 enter the third chute 45 along the second chute 44, and the steel strand 3 is stopped from being inserted into the drill pipe 1, so that the force on the second elastic member 48 is reduced, thereby pushing the limiting slider 323 into the third chute 45, thus completing the engagement of one end of the steel strand 3 with the anchoring head 4, fixing the steel strand 3, and reducing the probability of the steel strand 3 being separated from the anchoring head 4 during the subsequent grouting process.

[0052] After one end of the steel strand 3 is engaged with the anchoring head 4, grouting of the fixing hole is started. The grouting liquid enters the fixing hole along the drill pipe 1 and the connecting head 2. As the grouting liquid gradually enters the fixing hole, the drill pipe 1 and the connecting head 2 are pulled, so that the drill pipe 1 and the connecting head 2 gradually extend out of the fixing hole, and the adjusting slider 3174 gradually moves out of the first inclined chute 11 and the second inclined chute 21.

[0053] When the adjusting slider 3174 moves along the first inclined sliding groove 11 and the second inclined sliding groove 21, the adjusting slider 3174 drives the adjusting ring 314 to rotate through the adjusting rod 3173, the sleeve 3171, the connecting shaft 316 and the limiting block 315, thereby driving the limiting rod 318 and the stirring plate 319 to rotate, and further stirring the grouting liquid to prevent the local solidification of the grouting liquid first, so as to avoid the stratification phenomenon.

[0054] When the adjusting slider 3174 moves out of the second inclined sliding groove 21, the torsion spring and the first elastic member 3172 are simultaneously released from stress, so that the adjusting slider 3174 fits against the inner wall of the fixing hole. Also, since the elastic coefficients of the plurality of torsion springs and the first elastic member 3172 are the same, the stress conditions of the plurality of torsion springs and the first elastic member 3172 are equal, thereby limiting the steel strand 3 to the center position of the fixing hole, and thus solving the problems of reduced anchoring force, uneven anchoring effect, asymmetric stress and decreased system stability when the anchor rod is not at the center of the fixing hole.

[0055] The embodiments of the present invention are given for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A grouting anchor rod for auxiliary fixing hole center, comprising a drill rod (1), a connector (2) located at the bottom of the drill rod (1), a steel strand (3) located in the drill rod (1) and an anchor head (4) located at the bottom of the connector (2), wherein one end of the drill rod (1) is connected to the connector (2) by a thread, and characterized in that: The inner wall of the drill rod (1) is provided with a plurality of first inclined grooves (11), the inner wall of the connector (2) is provided with a plurality of second inclined grooves (21), the first inclined grooves (11) are connected to the second inclined grooves (21), the steel strand (3) is provided with a plurality of adjustment components (31), and one end of the steel strand (3) is provided with a locking member (32); The adjustment assembly (31) comprises a first limiting ring (311) fixed on the steel strand (3); a "T"-shaped sliding groove (312) is provided on the first limiting ring (311); a connecting ring (313) is slidably connected in the "T"-shaped sliding groove (312); an adjusting ring (314) is fixedly connected to the connecting ring (313); a plurality of limiting blocks (315) are symmetrically fixedly connected to the adjusting ring (314); a connecting shaft (316) is provided between the symmetrically arranged limiting blocks (315); the connecting shaft (316) is fixedly connected to the limiting blocks (315); an adjusting leg (317) is connected to the connecting shaft (316) via a torsion spring; one end of the adjusting leg (317) is located in the first inclined sliding groove (11).

2. The grouting anchor rod for auxiliary fixing hole center as claimed in claim 1, characterized in that: The bottom of the connecting head (2) is fixedly connected with a plurality of first docking blocks (22), and the top of the anchoring head (4) is fixedly connected with a plurality of second docking blocks (41), and the first docking blocks (22) and the second docking blocks (41) are meshed with each other.

3. The grouting anchor rod for auxiliary fixing hole center according to claim 1, characterized in that: A plurality of limit rods (318) are arranged between adjacent adjustment rings (314), and a stirring plate (319) is fixedly connected to each of the limit rods (318). Both ends of the limit rods (318) are respectively fixedly connected to adjacent adjustment rings (314).

4. The grouting anchor rod for auxiliary fixing hole center according to claim 1, characterized in that: The adjusting leg (317) comprises a sleeve (3171), wherein the sleeve (3171) is connected to the connecting shaft (316) via a torsion spring, wherein a first elastic member (3172) is arranged in the sleeve (3171), wherein one end of the first elastic member (3172) is fixedly connected to the inner wall of the sleeve (3171), and the other end of the first elastic member (3172) is fixedly connected to an adjusting rod (3173).

5. The grouting anchor rod for auxiliary fixing hole center as claimed in claim 4, characterized in that: One end of the adjusting rod (3173) extends out of the sleeve (3171), and one end of the adjusting rod (3173) extending out of the sleeve (3171) is connected to an adjusting slider (3174) via a universal joint, and the adjusting slider (3174) is located in the first inclined slide groove (11).

6. The grouting anchor rod for auxiliary fixing hole center according to claim 1, characterized in that: The engaging member (32) comprises a limit plate (321), the limit plate (321) is fixedly connected to one end of the steel strand (3), a second limit ring (322) is fixedly connected to the limit plate (321), and a limit slider (323) is symmetrically fixedly connected to the second limit ring (322).

7. The grouting anchor rod for auxiliary fixing hole center according to claim 1, characterized in that: The anchor head (4) is vertically provided with a receiving hole (42), and the inner wall of the receiving hole (42) is symmetrically vertically provided with a first slide groove (43), a second slide groove (44) and a third slide groove (45), one end of the second slide groove (44) is connected to the first slide groove (43), and the other end of the second slide groove (44) is connected to the third slide groove (45).

8. The grouting anchor rod for auxiliary fixing the center of the hole as claimed in claim 7, characterized in that: A cone head (46) is fixedly connected to the bottom of the anchor head (4), and a limiting hole (47) is vertically provided at the bottom of the inner wall of the accommodating hole (42) and the top of the cone head (46). A second elastic member (48) is arranged in the limiting hole (47), and one end of the second elastic member (48) is fixedly connected to the bottom of the inner wall of the limiting hole (47), and the other end of the second elastic member (48) extends into the accommodating hole (42).

9. The grouting anchor rod for auxiliary fixing hole center according to claim 1, characterized in that: The anchor head (4) is provided with a third inclined slot (49), and a threaded strip (410) is fixedly connected inside the third inclined slot (49).

10. The grouting anchor rod for auxiliary fixing hole center according to claim 7, characterized in that: The top of the anchoring head (4) is provided with a slope (411), and the slope (411) is connected to the receiving hole (42).

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