A slope grouting self-drilling anchor fixing device and its application method

Abstract

This invention relates to the field of slope protection technology in geotechnical engineering, and discloses a self-drilling anchor fixing device for slope grouting and its usage method. The device includes a main rod, a drill bit module, a fastening module, and a grouting module. The transition sleeve of the drill bit module reinforces the connection between the drill bit and the main rod, preventing the drill bit from loosening during drilling. The sliding core rod of the grouting module, in conjunction with positioning marks, enables precise layered grouting from bottom to top. A flow meter visually determines whether each layer of grouting is complete. After grouting, the fastening module tightly fixes the anchor end to the slope surface, while the end plug seals the tail end of the main rod to prevent grout backflow. This device solves the problems of uneven grouting and unstable connection of existing anchors, effectively improving the reliability and ease of construction of slope protection.

Description

Technical Field

[0001] This invention relates to the field of slope protection technology in geotechnical engineering, and in particular to a slope grouting self-drilling anchor fixing device and its usage method. Background Technology

[0002] In slope protection operations in geotechnical engineering, self-drilling anchors are a commonly used support component. They can simultaneously complete drilling, grouting, and anchoring operations, and are widely used in slope reinforcement, landslide control, and other scenarios.

[0003] However, existing self-drilling anchors have several shortcomings: Firstly, most existing anchors use integral grouting, which cannot accurately grout layers at different depths on the slope. This easily leads to insufficient grouting in deep soil layers and excessive grouting in shallow layers, resulting in uneven anchoring force and poor support effect. Secondly, the connection structure between the drill bit and the rod body of existing anchors is simple, making them prone to loosening during drilling and affecting drilling accuracy. Furthermore, after grouting, the anchor ends are poorly secured, easily leading to grout backflow, and the connection between the anchor ends and the slope is not stable enough to meet the support requirements of high-slope slopes. In addition, it is impossible to visually determine whether each grouting layer is sufficient during the grouting process, easily resulting in incomplete grouting and affecting the reliability of the support. Summary of the Invention

[0004] To overcome the above deficiencies, the present invention provides a slope grouting self-drilling anchor fixing device and its usage method, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a slope grouting self-drilling anchor fixing device, comprising a main rod, the main rod comprising a hollow rod body, a spiral disc with spiral blades on the outer arc surface of the rod body, and multiple levels of grouting holes opened on the rod body, with multiple grouting holes provided in each level.

[0006] Furthermore, it also includes a drill bit module, which is fixedly installed at the head end of the main rod. The drill bit module includes a drill bit and a transition sleeve. The drill bit is fixedly installed at the head end of the main rod, and the transition sleeve is located on the outside of the joint between the main rod and the drill bit.

[0007] Furthermore, it also includes a fastening module, which is detachably fixed at the tail end of the main rod and used to fix the end of the anchor rod to the slope after grouting is completed.

[0008] Furthermore, it also includes a grouting module, which is detachably installed inside the main rod and slides with the main rod for feeding materials during grouting.

[0009] Furthermore: the drill bit module includes a drill bit, the head end of the main rod is provided with a head fixing end, the head fixing end is provided with threads, the tail end of the drill bit is provided with a matching threaded hole, and the drill bit is installed on the head fixing end by threaded connection.

[0010] Furthermore, the drill bit module also includes a transition sleeve, which is sleeved on the outside of the head fixed end. The transition sleeve slides with the main rod. A limit groove is opened at the head fixed end, and a limit snap ring is installed in the limit groove. Multiple elastic clamping pieces are arranged in an array on the inner side wall of the transition sleeve. One end of the clamping piece is fixedly connected to the inner side wall of the transition sleeve, and the other end extends obliquely towards the axis of the transition sleeve, so that an angle is formed between the clamping piece and the inner side wall of the transition sleeve, and the opening of the angle faces the main rod side. A limit boss is provided on the inner side wall of the transition sleeve, and multiple fastening grooves corresponding to the positions of the clamping pieces are arranged in an array on the outer arc surface of the drill bit.

[0011] Furthermore: the fastening module includes a fastening disc and an end pressure block. The fastening disc has a sleeve hole at its center. The tail end of the main rod is provided with a tail fixing end. The diameter of the tail fixing end is smaller than the diameter of the main rod body. The tail fixing end is provided with threads. The end pressure block is provided with corresponding threaded holes. After the grouting operation is completed, the fastening disc is sleeved on the tail fixing end through the sleeve hole. The end pressure block is installed on the end of the tail fixing end through a threaded connection. The head end face of the end pressure block abuts against the end face of the fastening disc.

[0012] Furthermore, multiple fixing rivets are arranged in an array on the end face of the fastening disc facing the drill bit module, and the fixing rivets are provided with slots.

[0013] Furthermore: the end block is provided with an end plug that matches the inner diameter of the main rod in the threaded hole, the end block has a hexagonal screwing part at the tail, and an internal hexagonal screw hole is opened on the end face of the tail of the end block.

[0014] Furthermore: the grouting module includes a core rod with a cavity inside. The cavity opening is located on the tail end face of the core rod. The head section of the core rod has a sliding part. The core rod slides with the main rod through the sliding part and the inner cavity of the main rod. A grouting ring groove is provided on the sliding part. Multiple grout outlet holes are provided in the grouting ring groove. The grouting ring groove is connected to the cavity inside the core rod through the grout outlet holes. A one-way connecting block is fixedly installed at the tail end of the core rod. A one-way valve and a flow meter are provided in the one-way connecting block. The tail end of the one-way connecting block is connected to the grouting feeding mechanism.

[0015] Furthermore, multiple positioning marks are provided on the outer arc surface of the core rod. The spacing between the positioning marks is equal to the spacing between the grouting holes on the main rod. When the positioning mark is exactly on the outer side of the tail end of the main rod, the grouting ring groove is aligned with the grouting hole.

[0016] Furthermore, the tail section of the core rod is provided with a handle, and both the handle and the outer arc surface of the transition sleeve are provided with anti-slip textures.

[0017] A method for using a slope grouting self-drilling anchor fixing device, characterized by comprising the following steps:

[0018] S1: Select different drill bits according to the different soil layers that need to be constructed, and fix the drill bits at the head end of the main rod;

[0019] S2: Slide the transition sleeve from the main rod toward the drill bit so that the clamping plate locks into the fastening groove;

[0020] S3: Fix the tail end of the main rod to the drilling mechanism, start the drilling mechanism, and drill the main rod into the soil layer where grouting is required until only the tail fixed end remains outside the soil layer.

[0021] S4: Connect the discharge pipe of the grouting feeding mechanism to the tail of the one-way connecting block, insert the core rod into the deepest part of the main rod from the tail of the main rod, hold the handle and pull the core rod up and down to control the position of the grouting ring groove inside the main rod;

[0022] S5: When the highest positioning mark is just at the end of the main rod, start the grouting and feeding mechanism to feed the grouting hole at the bottom of the main rod. Observe the value of the flow meter. When the flow rate decreases significantly, it proves that the grouting operation of this level is completed.

[0023] S6: Pull up the core rod. When the next positioning mark is exactly at the end of the main rod, start feeding material into the grouting hole of the next level and carry out grouting operation on the soil layer of that level. Observe the change in the flow meter value to determine whether the grouting operation of that level is completed.

[0024] S7: Repeat the operation of S6 until the grouting operation of all soil layers is completed, then close the grouting feeding mechanism;

[0025] S8: Place the fastening disc with the fixing rivet facing the soil layer onto the tail fixing end. By turning the screwing part of the end pressure block or the internal hexagon screw hole, push the fastening disc downward until the fixing rivet is inserted into the soil layer. At this time, the end plug is inserted into the tail end cavity of the main rod, completing the fastening and fixing of the main rod.

[0026] The present invention has the following beneficial effects:

[0027] 1. Layered Precision Grouting: Through the core rod and positioning marks of the grouting module, the grouting holes of different levels can be precisely aligned, and grouting can be carried out layer by layer from bottom to top to different depths of soil, ensuring that each soil layer can be fully grouted, avoiding the problem of uneven grouting, and effectively improving the uniformity of anchoring and support effect.

[0028] 2. Secure Drill Bit Connection: The structure of the transition sleeve and clamping plate can tighten the joint between the drill bit and the main rod after the drill bit is installed, preventing the drill bit from loosening during drilling, improving the stability and accuracy of drilling, and at the same time, it can be adapted to different drill bits, making it convenient to change according to the soil layer.

[0029] 3. Reliable installation and fastening: The spiral blades on the outside of the main rod can increase the contact area with the soil layer after the main rod is drilled into the soil layer, and firmly grip the soil layer. The fastening plate and fixing rivets of the fastening module can tightly fix the end of the anchor rod to the slope soil layer after grouting, improve the anchoring force at the end, and adapt to the support requirements of high slope. At the same time, the end plug can block the tail end of the main rod, effectively preventing grout backflow and ensuring the grouting effect.

[0030] 4. Grouting status can be monitored: The flow meter of the grouting module can monitor the grouting flow in real time. When the soil layer is fully grouted, the flow will decrease significantly. Operators can intuitively judge whether the grouting of the layer is completed, avoiding the situation of incomplete grouting and improving the reliability of grouting. The one-way valve can also further prevent grout backflow and ensure stable grouting pressure. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is an exploded view of the structure of the present invention;

[0033] Figure 3 This is an exploded view of the drill bit module.

[0034] Figure 4 This is one perspective of the exploded view of the fastening module structure;

[0035] Figure 5 A second perspective of the exploded view of the fastening module structure;

[0036] Figure 6 This is a structural schematic diagram of the grouting module head section;

[0037] Figure 7 This is an exploded view of the tail section of the grouting module.

[0038] Figure 8 A structural sectional view of the main rod;

[0039] Figure 9 This is a cross-sectional view of the core rod.

[0040] Figure 10 This is a structural cross-sectional view of the transition sleeve;

[0041] Figure 11 This is a cross-sectional view of the working state of the present invention during grouting operations;

[0042] Figure 12 for Figure 11 Enlarged view of section A;

[0043] Figure 13 This is a cross-sectional view of the structure after the grouting operation and subsequent fixing process of the present invention.

[0044] Figure 14 for Figure 13 Enlarged view of section B;

[0045] Figure 15 for Figure 13 Enlarged view of section C.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Main rod; 11. Rod body; 111. Head fixed end; 112. Tail fixed end; 113. Limiting groove; 12. Spiral blade; 13. Grouting hole; 2. Drill bit module; 21. Drill bit; 211. Fastening groove; 22. Transition sleeve; 221. Clamping plate; 222. Limiting boss; 23. Limiting snap ring; 3. Fastening module; 31. Fastening disc; 311. Sleeve hole; 312. Fixing rivet; 313. Slot; 32. End pressure block; 321. End plug; 322. Tightening part; 323. Socket headstock hole; 4. Grouting module; 41. Core rod; 411. Sliding part; 412. Grouting ring groove; 413. Grout outlet hole; 414. Handle; 415. Positioning mark; 42. One-way connecting block; 5. Soil layer. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Example 1

[0050] Reference Figure 1-15This invention provides an embodiment of a slope grouting self-drilling anchor fixing device, comprising a main rod 1, a drill bit module 2, a fastening module 3, and a grouting module 4. The main rod 1 is the main component of the anchor, consisting of a hollow rod body 11. A spiral blade 12 is provided on the outer arc surface of the rod body 11. After drilling, the spiral blade 12 enhances the bonding force between the anchor and the soil layer 5, strengthening the anchoring effect. Multiple levels of grouting holes 13 are provided on the rod body 11, with multiple grouting holes 13 arranged around the rod body at each level to deliver grout to soil layers 5 at different depths. The head end of the main rod 1 is provided with a head fixing end 111, with threads on the outer side for installing a drill bit 21. The tail end of the main rod 1 is provided with a tail fixing end 112, the diameter of which is smaller than the diameter of the main body of the rod body 11, and it is also threaded for installing the fastening module 3. A limiting groove 113 is also provided on the head fixing end 111 for installing the limiting snap ring 23 to limit the sliding position of the transition sleeve 22.

[0051] The drill bit module 2 is used to realize the drilling function and needs to ensure a stable connection with the main rod 1. The tail end of the drill bit 21 is provided with a threaded hole that matches the head fixing end 111. The drill bit 21 can be installed on the head end of the main rod 1 through threaded connection, which makes it convenient to replace different drill bits 21 according to different soil layer 5 characteristics and adapt to different construction scenarios. The transition sleeve 22 is fitted on the outside of the head fixed end 111 and can slide along the main rod 1. Multiple elastic clamping pieces 221 are arranged in an array on the inner wall of the transition sleeve 22. One end of the clamping piece 221 is fixedly connected to the inner wall of the transition sleeve 22, and the other end extends obliquely towards the axis of the transition sleeve 22, so that the clamping piece 221 and the inner wall of the transition sleeve 22 form an angle, and the opening of the angle faces the main rod 1. A fastening groove 211 corresponding to the position of the clamping piece 221 is opened on the outer arc surface of the drill bit 21. When the transition sleeve 22 is slid towards the drill bit 21, the clamping piece 221 will be squeezed and deformed, and finally snap into the fastening groove 211 and rebound, thus fastening the drill bit 21 to the main rod 1, preventing the drill bit 21 from loosening during drilling and improving the stability of the connection. The fastening groove 211 has a triangular cross-section, and the clamping piece 221 is inclined. When the drill bit 21 needs to be replaced, the transition sleeve 22 can be pushed towards the drill bit 21. At this time, the clamping piece 221 will slide out of the fastening groove 211. Then, the transition sleeve 22 can be rotated to make the clamping piece 221 move away from the position of the fastening groove 211, and the transition sleeve 22 can be removed from the drill bit 21. Then, the drill bit 21 can be removed from the main rod 1 through the threaded connection, completing the replacement of the drill bit 21 and adapting to the construction needs of different soil layers 5. The inner side of the transition sleeve 22 is also provided with a limiting boss 222. The limiting boss 222 cooperates with the limiting spring 23 to limit the position of the transition sleeve 22, prevent it from slipping off the main rod 1, and ensure the stability of the connection.

[0052] The fastening module 3 is used to fasten the end of the anchor rod after grouting is completed, while preventing grout backflow. The fastening disc 31 has a central hole 311 for fitting onto the tail fixing end 112. Multiple fixing rivets 312 are arranged in an array on the side of the fastening disc 31 facing the soil layer. Each fixing rivet 312 has a groove 313. When the fastening disc 21 is pushed towards the soil layer 5, the fixing rivets 312 insert into the soil layer 5 of the slope, tightly fixing the end of the anchor rod to the slope. The groove 313 increases the anchoring force at the end, preventing the anchor rod from loosening. The end pressure block 32 has a threaded hole that matches the tail fixing end 112. When the end pressure block 32 is tightened, the head face of the end pressure block 32 presses against the end face of the fastening disc 31, pushing the fastening disc 31 towards the soil layer 5 until the fixing rivets 312 are fully inserted into the soil layer. An end plug 321 is also provided in the threaded hole of the end pressure block 32. The size of the end plug 321 is adapted to the inner diameter of the main rod 1. When the end pressure block 32 is tightened in place, the end plug 321 will be inserted into the cavity at the tail end of the main rod 1, blocking the tail end of the main rod 1, effectively preventing the grout from flowing back from the tail end after grouting, and ensuring the grouting effect. The tail of the end pressure block 32 is provided with a hexagonal tightening part 322, and also has an internal hexagon screw hole 323. The operator can choose to use a wrench or an internal hexagon tool to tighten the end pressure block 32 according to the tools available on site, adapting to different construction conditions.

[0053] The grouting module 4 is used to implement the function of layered grouting. During grouting, it is inserted into the main rod 1 and slides with the main rod 1. The core rod 41 is the main body of the grouting module 4. It has a cavity inside, and the opening of the cavity is located at the tail end of the core rod 41 for conveying grout. The head section of the core rod 41 is provided with a sliding part 411. The size of the sliding part 411 is adapted to the inner cavity of the main rod 1, so that the core rod 41 can slide along the inner cavity of the main rod 1. A grouting ring groove 412 is provided on the sliding part 411. Multiple grout outlet holes 413 are provided in the grouting ring groove 412. The grout outlet holes 413 are connected to the cavity inside the core rod 41. When grout is conveyed, the grout will enter the grout outlet holes 413 from the cavity of the core rod 41, then enter the grouting ring groove 412, and then be discharged from the corresponding grouting holes 13 on the main rod 1 and injected into the soil layer 5.

[0054] Multiple positioning marks 415 are provided on the outer side of the core rod 41. The spacing between the positioning marks 415 is equal to the spacing between the grouting holes 13 of each layer on the main rod 1. When the core rod 41 is pulled up, as long as the positioning mark 415 is just outside the tail end of the main rod 1, it means that the grouting ring groove 412 is aligned with the corresponding grouting hole 13, thus achieving precise positioning and ensuring that the grout can be accurately discharged from the corresponding grouting hole 13, realizing layered grouting. A one-way connecting block 42 is fixedly installed at the tail end of the core rod 41, which contains a one-way valve and a flow meter. The one-way valve can prevent the grout from flowing back during the grouting process and ensure the stability of the grouting pressure. The flow meter can monitor the grouting flow rate in real time. When the soil layer 5 of the layer is fully grouted, the grout can no longer penetrate into the soil layer 5, and the grouting flow rate will decrease significantly. The operator can intuitively judge whether the grouting of the layer is completed by this change, avoiding the situation of incomplete grouting. The end of the core rod 41 is also equipped with a handle 414. The outer surfaces of the handle 414 and the transition sleeve 22 are provided with anti-slip textures, so that the operator will not slip when lifting the core rod or operating the transition sleeve, thus improving the convenience of operation.

[0055] Example 2

[0056] To further illustrate the above embodiments, the present invention also provides a method for using a slope grouting self-drilling anchor fixing device, the specific steps of which are as follows:

[0057] S1: First, select a suitable drill bit 21 according to the characteristics of the soil layer 5 at the construction location, and fix the drill bit 21 on the head fixing end 111 of the main rod 1 through thread connection to complete the installation of the drill bit 21.

[0058] S2: Slide the transition sleeve 22 from the main rod 1 toward the drill bit 21 until the clamping piece 221 of the transition sleeve 22 is engaged in the fastening groove 211 of the drill bit, thus strengthening the connection between the drill bit 21 and the main rod 1. At this time, the limiting spring 23 will restrict the position of the transition sleeve 22 to prevent it from sliding during drilling, thus completing the reinforcement of the drill bit 21.

[0059] S3: Fix the tail end of the main rod 1 to the drilling mechanism, start the drilling mechanism, drive the main rod 1 and drill bit 21 to carry out drilling operations, drill the main rod 1 into the soil layer 5 that needs to be reinforced, until the tail fixed end 112 of the main rod 1 is left outside the soil layer, stop drilling, and complete the drilling operation.

[0060] S4: Connect the discharge pipe of the grouting feeding mechanism to the tail of the one-way connecting block 42, and then insert the core rod 41 into the interior of the main rod 1 from the tail end of the main rod 1 until the head of the core rod 41 reaches the deepest part of the main rod 1, thus completing the preparation for grouting.

[0061] S5: Hold the handle 414 at the end of the core rod 41 and pull the core rod 41 upwards. When the highest positioning mark 415 moves to the outside of the end of the main rod 1, it indicates that the grouting ring groove 412 is aligned with the grouting hole 13 at the bottom of the main rod 1. At this time, start the grouting feeding mechanism to deliver grout into the core rod 41. The grout is injected into the bottom soil layer 5 through the grout outlet 413, the grouting ring groove 412, and the grouting hole 13. Observe the flow meter value during the process. When the flow rate decreases significantly, it indicates that the soil layer 5 has been fully grouted, and the grouting operation for this layer is completed.

[0062] S6: Continue to pull the core rod 41 upwards. When the next positioning mark 415 just moves to the end of the main rod 1, the grouting ring groove 412 is aligned with the grouting hole 13 of the previous level. At this time, grouting of the soil layer 5 begins. Similarly, by observing the change in the flow meter value, it is determined whether the grouting of this layer is completed.

[0063] S7: Repeat the above lifting and grouting operations to complete the grouting operation of all layers from bottom to top until all soil layers 5 have been grouted, then close the grouting feeding mechanism.

[0064] S8: With the side of the fastening disc 31 with the fixing rivet 312 facing the soil layer 5, put it on the tail fixing end 112 of the main rod 1. Then, depending on the tools on site, tighten the tightening part 322 or the internal hexagon screw hole 323 of the end pressure block 32 to tighten the end pressure block 32. The end pressure block 32 will push the fastening disc 31 to move towards the soil layer 5 until the fixing rivet 312 on the fastening disc 31 is inserted into the soil layer 5 on the slope. At this time, the end plug 321 on the end pressure block 32 will also be inserted into the tail cavity of the main rod 1 to block the tail of the main rod 1 and prevent the grout from flowing back, thus completing the fixing installation of the entire anchor rod.

[0065] This device, through the sliding grouting core rod 41 and the positioning mark, achieves precise layered grouting from bottom to top, ensuring that soil layers 5 at different depths can be fully grouted, thus improving the uniformity of anchoring. The structure of the transition sleeve 22 strengthens the connection between the drill bit 21 and the main rod 1, preventing loosening during drilling. After grouting is completed, the anchor rod end is tightly fixed to the slope surface through the fastening plate 31 and the fixing rivet 312, while the end plug 321 prevents grout backflow, improving the overall support effect and adapting to the support requirements of the slope.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A slope grouting self-drilling anchor fixing device, characterized in that, include: The main rod (1) includes a hollow rod body (11). A spiral blade (12) is provided on the spiral disk on the outer arc surface of the rod body (11). Multiple levels of grouting holes (13) are provided on the rod body (11), and multiple grouting holes (13) are provided on each level. Drill module (2), the drill module (2) is fixedly installed at the head end of the main rod (1). The drill module (2) includes a drill bit (21) and a transition sleeve (22). The drill bit (21) is fixedly installed at the head end of the main rod (1). The transition sleeve (22) is located on the outside of the joint between the main rod (1) and the drill bit (21). Fastening module (3) is detachably fixed at the tail end of the main rod (1) and is used to fix the end of the anchor rod to the slope after grouting is completed; Grouting module (4) is detachably installed inside the main rod (1). Grouting module (4) slides with the main rod (1) and is used for feeding materials during grouting.

2. The slope grouting self-drilling anchor fixing device according to claim 1, characterized in that: The drill bit module (2) includes a drill bit (21). The head end of the main rod (1) is provided with a head fixing end (111), the head fixing end (111) is provided with a thread, and the tail end of the drill bit (21) is provided with a matching threaded hole. The drill bit (21) is installed on the head fixing end (111) by threaded connection.

3. The slope grouting self-drilling anchor fixing device according to claim 2, characterized in that: The drill bit module (2) also includes a transition sleeve (22), which is sleeved on the outside of the head fixed end (111). The transition sleeve (22) is slidably engaged with the main rod (1). The head fixed end (111) has a limit groove (113), and a limit snap ring (23) is installed in the limit groove (113). Multiple elastic clamping pieces (221) are arranged in an array on the inner side wall of the transition sleeve (22). One end of the clamping piece (221) is connected to the main rod (111). The inner wall of the transition sleeve (22) is fixedly connected, and the other end extends obliquely towards the axis of the transition sleeve (22), so that the clamping piece (221) and the inner wall of the transition sleeve (22) form an angle, and the opening of the angle faces the main rod (1). The inner wall of the transition sleeve (22) is provided with a limiting boss (222), and multiple fastening grooves (211) corresponding to the position of the clamping piece (221) are arrayed on the outer arc surface of the drill bit (21).

4. The slope grouting self-drilling anchor fixing device according to claim 1, characterized in that: The fastening module (3) includes a fastening disc (31) and an end pressure block (32). The fastening disc (31) has a sleeve hole (311) at its center. The tail end of the main rod (1) is provided with a tail fixing end (112). The diameter of the tail fixing end (112) is smaller than the diameter of the main body of the main rod (1). The tail fixing end (112) is provided with threads. The end pressure block (32) is provided with corresponding threaded holes. After the grouting operation is completed, the fastening disc (31) is sleeved on the tail fixing end (112) through the sleeve hole (311). The end pressure block (32) is installed at the end of the tail fixing end (112) through a threaded connection. The head end face of the end pressure block (32) abuts against the end face of the fastening disc (31).

5. The slope grouting self-drilling anchor fixing device according to claim 4, characterized in that: The fastening disc (31) has multiple fixing rivets (312) arranged in an array on the end face facing the drill bit module (2), and the fixing rivets (312) have slots (313).

6. The slope grouting self-drilling anchor fixing device according to claim 4, characterized in that: The end pressure block (32) is provided with an end plug (321) that matches the inner diameter of the main rod (1) in the threaded hole. The end pressure block (32) is provided with a hexagonal screwing part (322) at the tail end. The end face of the end pressure block (32) is provided with an internal hexagonal screw hole (323).

7. The slope grouting self-drilling anchor fixing device according to claim 1, characterized in that: The grouting module (4) includes a core rod (41), which has a cavity. The cavity opening is located on the tail end face of the core rod (41). The head section of the core rod (41) is provided with a sliding part (411). The core rod (41) slides with the main rod (1) through the sliding part (411) and the inner cavity of the main rod (1). A grouting ring groove (412) is provided on the sliding part (411). Multiple grout outlet holes (413) are provided in the grouting ring groove (412). The grouting ring groove (412) is connected to the cavity inside the core rod (41) through the grout outlet holes (413). A one-way connecting block (42) is fixedly installed at the tail end of the core rod (41). A one-way valve and a flow meter are provided in the one-way connecting block (42). The tail end of the one-way connecting block (42) is connected to the grouting feeding mechanism.

8. A slope grouting self-drilling anchor fixing device according to claim 7, characterized in that: Multiple positioning marks (415) are provided on the outer arc surface of the core rod (41). The spacing between the positioning marks (415) is equal to the spacing between the grouting holes (13) on the main rod (1). When the positioning mark (415) is exactly outside the tail end of the main rod (1), the grouting ring groove (412) is aligned with the grouting hole (13).

9. A slope grouting self-drilling anchor fixing device according to claim 7, characterized in that: The tail section of the core rod (41) is provided with a handle (414), and anti-slip textures are provided on the outer arc surface of both the handle (414) and the transition sleeve (22).

10. The method of using a slope grouting self-drilling anchor fixing device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Select different drill bits (21) according to the different soil layers (5) to be constructed, and fix the drill bits (21) at the head end of the main rod (1); S2: Slide the transition sleeve (22) from the main rod (1) toward the drill bit (21) so that the clamping piece (221) locks into the fastening groove (211). S3: Fix the tail end of the main rod (1) to the drilling mechanism, start the drilling mechanism, and drill the main rod (1) into the soil layer (5) where grouting is required, until only the tail fixed end (112) remains outside the soil layer (5). S4: Connect the discharge pipe of the grouting feeding mechanism to the tail of the one-way connecting block (42), insert the core rod (41) from the tail of the main rod (1) into the deepest part of the main rod (1), hold the handle (414) and pull the core rod (41) up and down to control the position of the grouting ring groove (412) inside the main rod (1); S5: When the highest positioning mark (415) is just at the end of the main rod (1), start the grouting feeding mechanism to feed the grouting hole (13) at the bottom of the main rod (1). Observe the value of the flow meter. When the flow rate decreases significantly, it proves that the grouting operation of this level has been completed. S6: Pull up the core rod (41). When the next positioning mark (415) is exactly at the end of the main rod (1), start feeding the grouting hole (13) of the next level and carry out grouting operation on the soil layer (5) of that level. Observe the change in the value of the flow meter to determine whether the grouting operation of that level is completed. S7: Repeat the operation of S6 until the grouting operation of all soil layers (5) is completed, and then close the grouting feeding mechanism; S8: Place the fastening disc (31) with the fixing rivet (312) facing the soil layer (5) onto the tail fixing end (112). By turning the twisting part (322) or the internal hexagonal screw hole (323) of the end pressure block (32), push the fastening disc (31) downward until the fixing rivet (312) is inserted into the soil layer (5). At this time, the end plug (321) is inserted into the tail cavity of the main rod (1) to complete the fastening and fixing of the main rod (1).

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