A tunnel reinforcement advance small catheter installation structure and grouting method

Abstract

The application discloses a tunnel reinforcement advanced small catheter mounting structure and grouting method, relates to the technical field of tunnel excavation, and comprises a pipe body, the pipe body is formed with a grouting groove, and the outer peripheral sidewall of the pipe body comprises a grout stopping portion and a grouting portion; the grout stopping portion is formed with a plurality of grout conveying holes which are communicated with the grouting groove and a containing groove, and the grouting portion is formed with a plurality of overflow holes in a staggered manner; an expansion film; a rotating shaft which is rotatably connected to the pipe body and located in the grouting groove; a grout intercepting plate which is arranged on the rotating shaft and rotates in the grouting groove, the grout intercepting plate blocks the grouting groove when the grout intercepting plate is parallel to the grouting groove opening; a limiting column which is screw-connected to the pipe body, the limiting column is located on the side of the grout intercepting plate which is far away from the grouting groove opening, the limiting column is perpendicular to the grout intercepting plate, and the limiting column is provided with a plurality of limiting columns which are respectively perpendicular to the rotating shaft; a control assembly which controls the limiting column to slide into the pipe body when the expansion film expands out of the containing groove; and a grout stopping valve which is used for allowing grout to flow into the grouting groove in a one-way manner. The application can shorten the time required for small catheter construction.

Description

Technical Field

[0001] This application relates to the technical field of tunnel excavation, and in particular to an advanced small guide pipe installation structure and grouting method for tunnel reinforcement. Background Technology

[0002] In tunnel construction practice, different construction methods can be selected based on considerations of construction cost and construction speed. Common construction methods include full-face excavation, bench excavation, three-bench seven-step excavation, and shallow-buried tunneling, etc.

[0003] Shallow-buried tunneling involves excavation followed by support, requiring the soil to possess a certain degree of self-support and stability to prevent tunnel collapse during excavation. However, such ideally stable strata are rare in actual construction, often necessitating pre-support to reinforce and improve the soil ahead of the excavation face, ensuring it meets the requirements for self-support and stability. Specific pre-support construction methods include pipe roofing and advanced small guide pipes. Both pipe roofing and advanced small guide pipes are driven into the soil at a certain outward angle along the excavation face contour. Grouting is then used to form a protective structure around the excavated tunnel for pre-support, reinforcing the soil around the pipe roof steel pipes and creating an integrated protective structure to safeguard the stability of the tunnel excavation.

[0004] However, before the small guide pipe is inserted into the soil and grout is injected, in order to avoid grout leakage, a grout-stopping part is usually poured near the opening of the insertion hole of the small guide pipe. Then, the subsequent cement grout can be injected after the grout-stopping part has solidified. However, waiting for the grout-stopping part to solidify takes a certain amount of time, which affects the construction speed. Summary of the Invention

[0005] To shorten the construction time required for small-diameter pipe installation, this application provides an advanced small-diameter pipe installation structure and grouting method for tunnel reinforcement.

[0006] In the first aspect, this application provides an advanced small guide pipe installation structure for tunnel reinforcement, which adopts the following technical solution: A pre-installed small guide pipe structure for tunnel reinforcement, comprising: The pipe body has a grouting groove, and the outer peripheral sidewall of the pipe body includes a grout-stopping part and a grouting part. The grout-stopping part has a receiving groove extending in the circumferential direction. The grout-stopping part has multiple grout delivery holes that connect the grouting groove and the receiving groove, and the grouting part is offset to form multiple overflow holes that connect to the grouting groove. An expansion membrane is disposed in the tube and surrounds the receiving groove; A rotating shaft is rotatably connected to the pipe body and located within the grouting trench; the rotating shaft is perpendicular to the central axis of the pipe body. A grout-cutting plate is disposed on the rotating shaft. The grout-cutting plate rotates within the grouting groove. When the grout-cutting plate is parallel to the opening of the grouting groove, the grout-cutting plate blocks the grouting groove. A limiting post is threadedly connected to the pipe body. The limiting post is located on the side of the grout cutting plate away from the grouting groove opening. The limiting post is perpendicular to the grout cutting plate. There are multiple limiting posts, each of which is perpendicular to the rotation axis. A control component is disposed in the tube body. When the expansion membrane expands to outside the receiving groove, the control component controls the limiting column to slide into the tube body. A grout stop valve is installed on the pipe opening side of the pipe body, and the grout stop valve allows cement grout to flow unidirectionally into the grouting tank.

[0007] By adopting the above technical solution, during reinforcement, the pipe body is inserted into the soil and fixed to the pipe roof by welding. Then, the grout stop valve is fixed to the pipe body before grouting. During grouting, cement grout enters the receiving tank through the grout delivery hole, causing the expansion membrane to expand. When the expansion membrane abuts the wall of the insertion groove, the control component controls the rotation of the limiting column, causing the limiting column to slide into the pipe body. Afterward, the grout cutting plate flips to open the grouting groove, allowing cement to continue flowing into the grouting groove and then overflowing through the overflow hole, forming a solidification with the soil around the pipe body, which is beneficial for reinforcing and supporting the tunnel excavation section. At the same time, as cement continues to be poured into the grouting groove, the continuous injection of cement grout limits the backflow of grout in the receiving tank, maintaining the state of the grout stop section. During construction, the expansion membrane forms a grout stop section on the outer periphery of the pipe body, greatly reducing the time required for pipe construction.

[0008] Optionally, the control assembly includes a control board, a control column, and a control rope; The control plate slides within the receiving groove, and the control plate is close to or away from the grouting groove; The control rope slides through the tube body, the control rope is wrapped around the outer periphery of the limiting post, one end of the control rope is connected to the limiting post, and the other end of the control rope is connected to the control plate; When the control plate moves away from the grouting trench, the control rope causes the limiting column to slide into the pipe body.

[0009] By adopting the above technical solution, when the control plate is far away from the grouting tank, the control rope drives the rotating shaft to rotate, so that the rotating shaft slides into the pipe body, which is conducive to the separation of the column and the grouting plate.

[0010] Optionally, a connecting sleeve is slidably sleeved on the outer periphery of the limiting post, the connecting sleeve is rotatably connected to the tube body, and the control rope is wound around the outer periphery of the connecting sleeve; A limiting block is provided on the outer periphery of the limiting column, and a limiting groove is formed on the inner periphery of the connecting sleeve to allow the limiting block to slide axially.

[0011] By adopting the above technical solution, the connecting sleeve is slidably fitted onto the limiting post, reducing the possibility of increased friction between the control rope and the tube body due to bending when the limiting post slides into the tube body.

[0012] Optionally, the control plate is fixed to the inner wall of the expansion membrane.

[0013] By adopting the above technical solution, it is convenient for the expansion membrane to move the control plate away from the grouting tank when it expands.

[0014] Optionally, the control board includes a first plate, a second plate, and a control spring; The first plate has an installation groove formed on the side near the grouting groove, and the second plate slides in the installation groove, with the peripheral sidewall of the second plate in sliding contact with the peripheral groove wall of the installation groove. The control rope is connected at one end away from the limiting post to the side of the second plate near the grouting groove; The control spring is installed in the mounting groove, with one end abutting against the second plate and the other end abutting against the wall of the mounting groove.

[0015] By adopting the above technical solution, after the expansion membrane expands, the cement slurry pushes the second plate into the installation groove, which causes the control rope to drive the rotating shaft to rotate, which is beneficial for the expansion membrane to adapt to the insertion grooves of supply pipes of different diameters.

[0016] Optionally, the second plate body sidewall is provided with a limiting block, and the mounting groove wall is formed with a limiting groove for the limiting block to slide.

[0017] By adopting the above technical solution, the limiting block slides in the limiting groove, reducing the possibility of the second plate dislodging from the mounting groove.

[0018] Optionally, the pipe body is slidably provided with a sealing sleeve along the axial direction, and the outer wall of the sealing sleeve is in sliding contact with the wall of the grouting trench; The sealing sleeve is provided with a connecting hole corresponding to each of the grout delivery holes. The pipe body is provided with a driving component. When the grout cutting plate rotates to open the grouting groove, the driving component drives the sealing sleeve to the point where the connecting hole and the grout delivery hole are misaligned.

[0019] By adopting the above technical solution, when the grouting trough is opened by the grout cutting plate, the sealing sleeve blocks the grout delivery hole, further reducing the possibility of cement grout flowing back into the grouting trough.

[0020] Optionally, the drive assembly includes a drive rack and a drive gear; The drive gear is disposed on the rotating shaft and is rotatably connected to the tube body; The drive rack is connected to the sealing sleeve, the drive rack meshes with the drive gear, and the sliding direction of the drive rack is parallel to the central axis of the tube.

[0021] By adopting the above technical solution, when the rotating shaft rotates, the drive gear drives the sealing sleeve to slide through the drive rack.

[0022] Optionally, the drive rack is provided with a blank section, and when the slurry delivery hole and the connecting hole are misaligned, the drive gear rotates in the blank section.

[0023] By adopting the above technical solution, when the sealing sleeve blocks the slurry conveying hole, the drive gear idles in the blank section, allowing the cutting plate to continue to rotate.

[0024] Secondly, this application provides a grouting method for tunnel reinforcement structures, employing the following technical solution: A grouting method for reinforcing tunnel structures includes the following steps: S1: Insert the pipe into the soil and fix the pipe to the pipe shed; S2: Fix the slurry stop valve to one side of the pipe opening of the pipe body; S3: Cement is injected into the grouting tank through the grout stop valve.

[0025] By adopting the above technical solution, during pipe construction, the expansion membrane expands to form a grout-stopping section around the pipe, limiting cement grout leakage and greatly shortening the pipe construction time.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. During construction, the expansion membrane expands to form a grout-stopping section, limiting cement grout leakage and shortening the time required for conduit construction; 2. When the grouting trench is opened by the grout cutting plate, the sealing sleeve blocks the grout delivery hole to further reduce the possibility of cement grout flowing back into the grouting trench. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the external structure of an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of the pipe body inserted into the soil in an embodiment of this application; Figure 3 This is a schematic diagram of the internal cross-section of the tube in an embodiment of this application; Figure 4 yes Figure 3 Schematic diagram of Part A; Figure 5 yes Figure 3 Schematic diagram of Part B; Figure 6 yes Figure 2A schematic diagram of section C.

[0028] Reference numerals: 1. Pipe body; 11. Grouting groove; 2. Grout stopping part; 21. Receiving groove; 22. Grout delivery hole; 23. Expansion membrane; 3. Grouting part; 31. Overflow hole; 4. Rotating shaft; 41. Grout cutting plate; 5. Limiting column; 51. Connecting sleeve; 511. Limiting groove; 52. Limiting block; 6. Grout stopping valve; 7. Control rope; 71. Control plate; 711. First plate; 712. Second plate; 713. Control spring; 714. Mounting groove; 715. Limiting block; 716. Limiting groove; 8. Sealing sleeve; 81. Connecting hole; 9. Drive gear; 91. Drive rack; 911. Blank section. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] This application discloses an advanced small guide pipe installation structure for tunnel reinforcement. See also... Figure 1 The installation structure includes a pipe body 1, which is cylindrical with one end forming a conical shape. Before tunnel excavation, inclined upward-extending insertion grooves need to be formed in the soil at an angle between 5 and 10 degrees. Multiple insertion grooves surround the tunnel excavation profile. Before tunnel excavation, the conical end of the pipe body 1 passes through the pipe roof and is then inserted obliquely upward into the insertion groove in the soil. The pipe body 1 is then fixedly connected to the pipe roof by welding.

[0031] See Figure 2 and Figure 3 The pipe body 1 has a grouting groove 11 inside, and the grouting groove 11 extends out of the pipe body 1 in a direction away from the conical structure. The outer periphery of the pipe body 1 includes a grouting part 3 and a grout-stopping part 2. The grout-stopping part 2 is located near the opening of the grouting groove 11, and the grouting part 3 is located on the side of the grout-stopping part 2 away from the opening of the grouting groove 11. A grout-stopping section is formed between the grout-stopping part 2 and the groove wall of the insertion groove, reducing the possibility of grout leaking out of the insertion groove after cement injection.

[0032] The grouting section 3 has multiple overflow holes 31, which are staggered and interconnected with the grouting groove 11. After cement is injected into the grouting groove 11, under the pressure generated by continuous injection, the cement in the grouting groove 11 overflows from the overflow holes 31 and enters the insertion groove. At the same time, the cement in the insertion groove spreads around the insertion groove under the pressure of the grout continuously overflowing from the overflow holes 31, forming a cement-consolidated section centered on the pipe body 1. At this time, the cement-consolidated section provides advance support for the tunnel to be excavated.

[0033] See Figure 3 and Figure 4The grout-stopping section 2 has a receiving groove 21, which extends circumferentially around the central axis of the pipe body 1. The tunnel reinforcement structure also includes an expansion membrane 23, which is made of materials such as rubber or silicone with elastic deformation capabilities. In this embodiment, the expansion membrane 23 has a smooth structure; in other embodiments, the expansion membrane 23 can also have a bellows-like structure. The expansion membrane 23 is fixed to the wall of the receiving groove 21 and surrounds the receiving groove 21, sealing the opening of the receiving groove 21. The grout-stopping section 2 has multiple grout delivery holes 22, which are respectively connected to the grouting tank 11 and the receiving groove 21. After cement enters the grouting tank 11, it enters the receiving groove 21 through the grout delivery holes 22.

[0034] See Figure 4 and Figure 5 The installation structure also includes a rotating shaft 4, a grout-cutting plate 41, and a limiting column 5. The rotating shaft 4 is rotatably connected to the pipe body 1 and located within the grouting groove 11. The central axis of the rotating shaft 4 is perpendicular to the central axis of the pipe body 1, and the grout delivery hole 22 is located on the rotating shaft 4 away from the grouting part 3 (the grouting part 3 is in...). Figure 3 (Pointed out) One side. The grout-cutting plate 41 is fixedly connected to the outer periphery of the rotating shaft 4 and located inside the grouting groove 11. The end face of the grout-cutting plate 41 is circular and the outer peripheral sidewall has an arc surface structure. The central axis of the grout-cutting plate 41 coincides with the central axis of the rotating shaft 4. The grout-cutting plate 41 can rotate inside the grouting groove 11, and the outer peripheral sidewall of the grout-cutting plate 41 slides in contact with the peripheral wall of the grouting groove 11. When the grout-cutting plate 41 is flipped so that its end face is parallel to the opening of the grouting groove 11, the grout-cutting plate 41 seals the grouting groove 11.

[0035] Two connecting grooves are symmetrically opened circumferentially on the side wall of the grouting groove 11. The connecting grooves are located on the side of the rotating shaft 4 away from the grout delivery hole 22. The limiting post 5 corresponds to the connecting groove and is threaded to the groove wall. When the limiting post 5 protrudes into the grouting groove 11 and the cutting plate 41 is flipped to be parallel to the groove opening of the grouting groove 11, the outer periphery of the limiting post 5 abuts against the end face of the cutting plate 41 away from the groove opening of the grouting groove 11. At this time, the limiting post 5 supports the cutting plate 41. When cement is poured into the grouting groove 11, the cutting plate 41 intercepts the cement slurry. At this time, the cement slurry is continuously poured in. Under the action of pressure, the cement slurry enters the receiving groove 21 through the grout delivery hole 22. As the slurry is continuously poured in, the expansion membrane 23 begins to expand outward from the receiving groove 21 until the expansion membrane 23 abuts against the side wall of the insertion groove. At this time, the expansion membrane 23 and the cement slurry cooperate to form a grout-stopping section, which helps to reduce the possibility of slurry leakage out of the insertion groove.

[0036] The installation structure also includes a control component, which is located in the pipe body 1. When the expansion membrane 23 expands to the outside of the receiving groove 21, the control component controls the limiting column 5 to slide into the pipe body 1 until the limiting column 5 separates from the grout cutting plate 41. At this time, the cement pressure drives the grout cutting plate 41 to rotate and open the grouting groove 11, so that the cement can continue to flow into the grouting groove 11 until it overflows into the insertion groove through the overflow hole 31.

[0037] The control assembly includes a control rope 7 and a control plate 71. The control plate 71 has an arc-shaped structure and slides within the receiving groove 21. There are two control plates 71, each corresponding to a limiting post 5. The arc-shaped convex side of the control plate 71 faces away from the grouting groove 11 and is fixedly connected to the inner wall of the expansion membrane 23. When the expansion membrane 23 expands, the control plate 71 moves away from the grouting groove 11; when the expansion membrane 23 contracts, the control plate 71 moves closer to the grouting groove 11.

[0038] The pipe body 1 has a control groove that is circumferentially connected to the connecting groove. A connecting sleeve 51 is slidably sleeved on the outer periphery of the limiting post 5, and the connecting sleeve 51 is rotatably connected to the control groove. A limiting block 52 is fixedly connected to the outer periphery of the limiting post 5. A limiting groove 511 extending axially is formed on the inner periphery of the connecting sleeve 51. The limiting block 52 is slidably connected in the limiting groove 511, so that the connecting sleeve 51 and the limiting post 5 are connected, and the limiting post 5 can slide axially on the connecting sleeve 51.

[0039] The control rope 7 slides through the pipe body 1, corresponding one-to-one with the limiting post 5. The control rope 7 is wrapped around the outer periphery of the connecting sleeve 51, with one end fixedly connected to the outer periphery of the connecting sleeve 51, and the other end fixedly connected to the side of the control plate 71 near the grouting groove 11. When the expansion membrane 23 expands, causing the control plate 71 to move away from the grouting groove 11, the control rope 7 pulls the connecting sleeve 51 to rotate. At this time, the limiting post 5 slides into the connecting groove until the limiting post 5 separates from the grout cutting plate 41. Then, the grout cutting plate 41 flips over, and the cement continues to flow into the grouting groove 11. During construction, in order to allow the expansion membrane 23 to expand to the outside of the receiving groove 21 and abut against the wall of the insertion groove, the radius of the insertion groove can be determined by the distance between the outer wall of the expansion membrane 23 and the central axis of the pipe body 1 when the expansion membrane 23 expands to the outside of the receiving groove 21.

[0040] To further reduce the construction difficulty of tunnel reinforcement, the control plate 71 includes a first plate 711, a second plate 712, and a control spring 713. The first plate 711 is fixedly connected to the expansion membrane 23. An installation groove 714 is formed on the side of the first plate 711 near the grouting groove 11. The second plate 712 slides in the installation groove 714 in a direction close to or away from the grouting groove 11. The end of the control rope 7 away from the connecting sleeve 51 is fixed to the side of the second plate 712 near the grouting groove 11. A limiting block 715 is fixedly connected to the side wall of the second plate 712. A limiting groove 716 is formed in the groove wall of the installation groove 714. The limiting block 715 slides in the limiting groove 716 to prevent the second plate 712 from detaching from the installation groove 714. The control spring 713 is installed in the installation groove 714. One end of the control spring 713 abuts against the second plate 712, and the other end abuts against the groove wall of the installation groove 714 away from the groove opening. When the control spring 713 is released elastically, it pushes the second plate 712 to slide towards the grouting groove 11 until the control spring 713 is relaxed. At this point, there is a gap between the limiting block 715 and the limiting groove 716 on the side wall of the grouting groove 11.

[0041] When the cement grout is poured into the receiving tank 21, causing the expansion membrane 23 to expand outward from the receiving tank 21, the expansion membrane 23 drives the first plate 711 away from the grouting tank 11. At this time, the second plate 712 slides in the installation tank 714 under the pull of the control rope 7. When the expansion membrane 23 touches the wall of the insertion slot, the cement grout continues to be poured in, and the second plate 712 is squeezed into the installation tank 714 by the cement grout. At this time, the second plate 712 pulls the control rope 7 to drive the connecting sleeve 51 to rotate, which helps the expansion membrane 23 adapt to insertion slots of different diameters.

[0042] The pipe body 1 is equipped with a sealing sleeve 8, which slides within the grouting groove 11, and the outer peripheral wall of the sealing sleeve 8 is in sliding contact with the peripheral wall of the grouting groove 11. Multiple connecting holes 81 are formed on the peripheral wall of the sealing sleeve 8, and each connecting hole 81 corresponds to a grout delivery hole 22. When the grout cutting plate 41 seals the grouting groove 11, the connecting holes 81 and the grout delivery holes 22 are aligned and connected.

[0043] See Figure 5 and Figure 6 The tube body 1 is equipped with a drive assembly, which includes a drive gear 9 and a drive rack 91. The drive rack 91 slides inside the tube body 1 in a direction perpendicular to the central axis of the tube body 1. The drive rack 91 is fixedly connected to the sealing sleeve 8. The drive gear 9 is fixed to the outer circumference of the rotating shaft 4 and is rotatably connected to the tube body 1. The drive gear 9 and the drive rack 91 mesh with each other.

[0044] See Figure 5 and Figure 6When the cutting plate 41 is flipped, the rotating shaft 4 rotates. At this time, the driving gear 9 drives the driving rack 91 to slide, so that the sealing sleeve 8 slides away from the opening of the grouting groove 11. The sealing sleeve 8 is driven to slide until the cutting plate 41 opens the grouting groove 11, and the sealing sleeve 8 slides until the connecting hole 81 and the grouting hole 22 are misaligned.

[0045] The drive rack 91 is provided with a blank section 911, which is located near the sealing sleeve 8. When the connecting hole 81 and the slurry delivery hole 22 are misaligned, the drive gear 9 and the blank section 911 are aligned. At this time, when the slurry cutting plate 41 continues to rotate, the drive gear 9 idles in the blank section 911.

[0046] See Figure 3 The installation structure also includes a grout stop valve 6, which is fixed to the end of the pipe body 1 away from the conical shape. During grouting, the grouting pipe is connected to the grout stop valve 6, and the cement grout flows into the grouting tank 11 in one direction through the grout stop valve 6. At this time, the grout stop valve 6 restricts the cement grout from overflowing from the grouting tank 11.

[0047] The implementation principle of the advanced small guide pipe installation structure for tunnel reinforcement in this application embodiment is as follows: During reinforcement, the pipe body 1 is inserted into the splice groove and fixed to the pipe roof by welding. Then, the grout stop valve 6 is fixed to the pipe body 1 before grouting. During grouting, cement grout enters the receiving tank 21 through the grout delivery hole 22, causing the expansion membrane 23 to expand. When the expansion membrane 23 abuts the wall of the splice groove, the control rope 7 pulls the limiting column 5 to rotate, causing the limiting column 5 to slide into the pipe body 1. Afterward, the grout cutting plate 41 flips to open the grouting tank 11, causing the sealing sleeve 8 to seal the grout delivery hole 22. Cement continues to flow into the grouting tank 11 and overflows through the overflow hole 31, forming a solid bond with the soil around the pipe body 1, which is beneficial for reinforcing and supporting the tunnel excavation section.

[0048] On the other hand, this application discloses a grouting method for tunnel reinforcement structures, including the following steps: Step 1: Insert pipe body 1 into the soil, and fix pipe body 1 to the pipe shed by welding; Step 2: Fix the grout stop valve 6 to one side of the pipe opening of the pipe body 1; Step 3: After connecting the grout delivery pipe to the grout stop valve 6, cement grout is injected into the grouting tank 11 through the grout stop valve 6 to form a reinforced support structure around the tunnel.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pre-installed small guide pipe structure for tunnel reinforcement, characterized in that: include The pipe body (1) has a grouting groove (11) and the outer peripheral sidewall of the pipe body (1) includes a grout-stopping part (2) and a grouting part (3). The grout-stopping part (2) has a receiving groove (21) extending in the circumferential direction. The pipe body (1) has a plurality of grouting holes (22) that connect the grouting tank (11) and the receiving tank (21), and the grouting part (3) is misaligned to form a plurality of overflow holes (31) that connect to the grouting tank (11). An expansion membrane (23) is disposed on the tube (1) and surrounds the receiving groove (21). A rotating shaft (4) is rotatably connected to the pipe body (1) and located inside the grouting tank (11). The rotating shaft (4) is perpendicular to the central axis of the pipe body (1). A grout-cutting plate (41) is set on the rotating shaft (4). The grout-cutting plate (41) rotates in the grouting groove (11). When the grout-cutting plate (41) is parallel to the opening of the grouting groove (11), the grout-cutting plate (41) blocks the grouting groove (11). A limiting post (5) is threaded to the pipe body (1). The limiting post (5) is located on the side of the grouting plate (41) away from the opening of the grouting groove (11). The limiting post (5) is perpendicular to the grouting plate (41). There are multiple limiting posts (5) and they are all perpendicular to the rotating shaft (4). A control component is provided in the tube body (1). When the expansion membrane (23) expands to the outside of the receiving groove (21), the control component controls the limiting column (5) to slide into the tube body (1). A grout stop valve (6) is provided on the pipe opening side of the pipe body (1). The grout stop valve (6) allows cement grout to flow unidirectionally into the grouting tank (11). The control assembly includes a control board (71) and a control rope (7); The control plate (71) slides within the receiving groove (21), and the control plate (71) is close to or away from the grouting groove (11). The control rope (7) slides through the tube (1), the control rope (7) is wrapped around the outer periphery of the limiting post (5), one end of the control rope (7) is connected to the limiting post (5), and the other end of the control rope (7) is connected to the control plate (71). When the control panel (71) moves away from the grouting tank (11), the control rope (7) drives the limiting column (5) to slide into the pipe body (1); The limiting post (5) is slidably sleeved with a connecting sleeve (51) on its outer periphery. The connecting sleeve (51) is rotatably connected to the tube body (1). The control rope (7) is wrapped around the outer periphery of the connecting sleeve (51). A limiting block (52) is provided on the outer periphery of the limiting post (5), and a limiting groove (511) is formed on the inner periphery of the connecting sleeve (51) for the limiting block (52) to slide along the axial direction. The control plate (71) is fixed to the inner wall of the expansion membrane (23); The control panel (71) includes a first plate (711), a second plate (712), and a control spring (713); The first plate (711) has an installation groove (714) formed on the side near the grouting groove (11), and the second plate (712) slides in the installation groove (714). The peripheral sidewall of the second plate (712) is in sliding contact with the peripheral groove wall of the installation groove (714). The control rope (7) is connected at one end away from the limiting post (5) to the side of the second plate (712) near the grouting groove (11); The control spring (713) is installed in the mounting groove (714), with one end of the control spring (713) abutting against the second plate (712) and the other end abutting against the groove wall of the mounting groove (714).

2. The tunnel reinforcement pre-installation structure for small guide pipes according to claim 1, characterized in that: The second plate (712) has a limiting block (715) on its side wall, and the mounting groove (714) has a limiting groove (716) formed on its groove wall for the limiting block (715) to slide.

3. The tunnel reinforcement pre-conduit installation structure according to claim 1, characterized in that: The pipe body (1) is slidably provided with a sealing sleeve (8) along the axial direction, and the outer wall of the sealing sleeve (8) is in sliding contact with the wall of the grouting groove (11); The sealing sleeve (8) is provided with a connecting hole (81) corresponding to the grouting hole (22). The pipe body (1) is provided with a driving component. When the grout cutting plate (41) rotates to open the grouting groove (11), the driving component drives the sealing sleeve (8) to the point where the connecting hole (81) is misaligned with the grouting hole (22).

4. The tunnel reinforcement pre-conduit installation structure according to claim 3, characterized in that: The drive assembly includes a drive rack (91) and a drive gear (9); The drive gear (9) is disposed on the rotating shaft (4) and the drive gear (9) is rotatably connected to the tube body (1). The drive rack (91) is connected to the sealing sleeve (8), the drive rack (91) meshes with the drive gear (9), and the sliding direction of the drive rack (91) is parallel to the central axis of the tube body (1).

5. The tunnel reinforcement pre-installation structure for small guide pipes according to claim 4, characterized in that: The drive rack (91) is provided with a blank section (911). When the slurry delivery hole (22) is misaligned with the connecting hole (81), the drive gear (9) rotates in the blank section (911).

6. A grouting method for a tunnel reinforcement structure, employing a pre-installed small guide pipe installation structure for tunnel reinforcement as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Insert the pipe body (1) into the soil and fix the pipe body (1) to the pipe shed; S2: Fix the slurry stop valve (6) to one side of the pipe opening of the pipe body (1); S3: Cement is injected into the grouting tank (11) through the grout stop valve (6).

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