Tunnel segment wall back grouting device and grouting method

Abstract

The present application relates to the technical field of grouting, in particular to a kind of tunnel segment wall post grouting device, including grouting pipe group, movable grouting module and slurry supply pipeline, the grouting pipe group is used to drill into tunnel segment wall post, the movable grouting module is set in grouting pipe group inside, the movable grouting module moves along grouting pipe group inside, adjust the relative position of itself in grouting pipe group inside, and then adjust grouting point position, the slurry supply pipeline is set to grouting pipe group inside by grouting pipe group end opening, and the grouting pipe group end is connected with movable grouting module, and slurry supply pipeline is used to provide slurry to movable grouting module, the present application uses grouting pipe group to match movable movable grouting module, different grouting point positions can be switched in the inside of main grouting pipe along axial direction, and multiple-point sectional grouting is realized in tunnel segment wall post.

Description

Technical Field

[0001] This invention relates to the field of grouting technology, specifically to a grouting device and grouting method for tunnel segment wall backfilling. Background Technology

[0002] Sleeve valve grouting technology has been widely used in engineering scenarios such as foundation reinforcement, tunnel and underground structure wall grouting, leakage control and settlement control due to its advantages such as relatively simple construction equipment, wide applicable strata range and segmented repeated grouting. Traditional sleeve valve pipes generally have grout outlet holes in the pipe wall and a one-way valve on the outside of the grout outlet hole. During grouting, the grout opens the valve sleeve under pressure and enters the surrounding soil. However, in dense soil layers, local hard interlayers, discontinuous voids behind existing structural walls or insufficient grout diffusion channels, traditional sleeve valve pipes rely solely on grouting pressure to open the passage outside the grout outlet hole. The grout tends to diffuse along the direction of less resistance, making it difficult to form a stable and controllable grouting channel. Therefore, a tunnel segment wall grouting device and grouting method are proposed. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a tunnel segment wall back grouting device and grouting method.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a grouting device behind tunnel segment walls, comprising a grouting pipe assembly, a movable grouting module, and a grout supply pipeline;

[0005] After the grouting pipe assembly is drilled into the tunnel segment wall, the movable grouting module is set inside the grouting pipe assembly. The movable grouting module moves along the inside of the grouting pipe assembly to adjust its relative position inside the grouting pipe assembly, thereby adjusting the grouting point. The grout supply pipeline is sleeved into the inside of the grouting pipe assembly through the end opening of the grouting pipe assembly, and the end of the grouting pipe assembly is connected to the movable grouting module. The grout supply pipeline is used to supply grout to the movable grouting module.

[0006] Preferably, the grouting pipe assembly includes a main grouting pipe and a conical pipe. The main grouting pipe has several grouting points inside, and each grouting point consists of several grouting holes formed in a ring on the surface of the main grouting pipe. The conical pipe is welded to the bottom end of the main grouting pipe, and several grouting holes are formed on the surface of the conical pipe. A cover plate is threaded to the top of the main grouting pipe.

[0007] Preferably, the grouting pipe assembly further includes a rubber liner, which is attached to the inner wall of the main grouting pipe. The rubber liner and the grouting holes on the surface of the main grouting pipe are provided with through holes at corresponding positions, and the edges of the through holes are arc-shaped.

[0008] Preferably, the inner wall of the rubber liner is provided with a vertical guide groove, which is vertically connected to a through hole opened inside the rubber liner.

[0009] Preferably, the movable grouting module includes a grouting assembly, hydraulic push rods, a one-way valve, and end grout pipes. The grouting assembly is disposed inside the main grouting pipe and consists of an inner ring for connecting the grout supply pipeline and an outer ring for grouting. Several sets of hydraulic push rods are provided, and the several sets of hydraulic push rods are installed at equal intervals within the outer ring portion of the grouting assembly. The movable end of the hydraulic push rod is connected to the top of the inner wall of the main grouting pipe. The one-way valve is installed at the bottom of the grouting assembly, and several sub-grout outlets are provided at the bottom of the one-way valve. The position and number of the sub-grout outlets are consistent with the position and number of grouting holes opened on the surface of the tapered pipe. The number of end grout pipes is consistent with the number of sub-grout outlets, and the several sets of end grout pipes are correspondingly arranged at the bottom of the grout outlets.

[0010] Preferably, the movable length of the hydraulic push rod is consistent with the internal length of the main grouting pipe, and the main grouting pipe is divided into several working strokes, with the spacing between each working stroke matching the configuration of each grouting point.

[0011] Preferably, the grouting assembly includes a device slot, a grout conduit, a movable grouting head, and a return spring. The number of device slots is consistent with the number of grouting holes annularly formed on the surface of the main grouting pipe. Several sets of device slots are equally spaced in the middle of the grouting assembly. The grout conduit is installed inside the device slot and communicates with the inner ring portion of the grouting assembly. The movable grouting head is sleeved on the outside of the grout conduit, and the movable grouting head cooperates with the grout conduit to form an extendable grouting channel. The return spring is sleeved on the outside of the grout conduit, and both ends of the return spring abut against the device slot and the movable grouting head, respectively. The movable grouting head is pushed by the return spring.

[0012] Preferably, the end of the movable grouting head is arc-shaped to cooperate with the through hole in the rubber liner, the number of vertical grooves opened inside the rubber liner matches the number of movable grouting heads, and the rubber liner is nested in the vertical grooves.

[0013] Preferably, the slurry supply pipeline has a spliced ​​configuration, and the slurry supply pipeline is composed of several sub-segments connected by threads.

[0014] The method of using the tunnel segment backfill grouting device includes the following steps:

[0015] Step S1: Control the hydraulic push rod to fully extend and push the grouting assembly to the bottom grouting point of the main grouting pipe. The reset spring pushes the movable grouting protrusion head into the through hole of the rubber liner to form a sealed grouting channel. The end of the end grout pipe passes through the grouting hole of the tapered pipe and extends to the outside of the tapered pipe.

[0016] Step S2: The grouting pipe assembly is pushed into the tunnel segment wall by hydraulic equipment. The cone of the grouting pipe assembly breaks through the soil layer until the main grouting pipe is laid in the target grouting area behind the tunnel segment wall.

[0017] Rotate to remove the top cover plate of the main grouting pipe. Water in the soil behind the wall enters the main grouting pipe through the grouting holes on the surface of the main grouting pipe. The water that enters the main grouting pipe is discharged naturally along the inner wall of the main grouting pipe. When no more water is discharged, reinstall the top cover plate back at the end of the main grouting pipe.

[0018] Step S3: Select the corresponding number of grout supply pipe segments according to the construction space behind the tunnel segment wall, and assemble them by thread splicing to obtain the grout supply pipe. Connect the assembled grout supply pipe from the end opening of the grouting pipe group and connect it to the movable grouting module.

[0019] Step S4: Start the external grouting equipment and deliver grouting slurry to the grouting components through the grout supply pipeline; under the action of grouting pressure lower than the opening pressure of the one-way valve, the slurry is injected into the surrounding strata through the slurry conduit and the movable grouting protrusion head, and through the grouting hole in the main grouting pipe wall, to complete the circumferential grouting at this point.

[0020] Step S5: Increase the grouting pressure to the one-way valve opening pressure. The grout enters the grout pipes at each end through the one-way valve and completes the grouting of the bottom soil layer through the grouting hole at the cone pipe.

[0021] Step S6: After completing the grouting operation at the current point, stop grouting, control the hydraulic push rod to retract, and drive the grouting component to move upward to the next grouting point. During the movement, the edge of the rubber lining through hole squeezes the movable grouting protrusion, compressing the return spring to retract it into the device slot. After reaching the target grouting point, the return spring pushes the movable grouting protrusion again to seal and connect with the rubber lining through hole, and repeats the grouting operation process to complete the segmented grouting of each grouting point in sequence.

[0022] Step S7: After all the preset grouting points have been grouted, stop the grouting equipment from supplying grout, disconnect the grouting pipeline from the movable grouting module, disassemble and recycle the grouting pipeline in sections, and use external tools to pull out the grouting pipe assembly together with the internal movable grouting module as a whole, thus completing the recycling of the entire set of equipment and ending the wall grouting construction.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. This invention uses a grouting pipe assembly paired with a movable grouting module, which can switch different grouting points along the axial direction inside the main grouting pipe to achieve multi-point segmented grouting behind the tunnel segment wall; relying on the reset spring to push the movable grouting head and the through hole of the rubber lining to form a sealed grouting channel, a stable grout diffusion path can be established in a targeted manner, overcoming the defects of traditional sleeve valve pipes that rely solely on grouting pressure to open the valve sleeve and the grout easily diffuses disorderly along a path with low resistance. It is especially suitable for dense soil layers, hard interlayers, and strata behind the wall with discontinuous voids, with good grouting controllability and uniform reinforcement effect.

[0025] 2. This invention is equipped with a one-way valve and an end grout pipe, which can distinguish between circumferential grouting and bottom end grouting by adjusting the grouting pressure. One set of equipment can simultaneously complete circumferential grouting of the pipe body and bottom stratum grouting of the pipe end. The grout supply pipeline adopts a segmented threaded splicing structure, which can adapt to different construction spaces. After the entire set of equipment is completed, it can be pulled out and recycled as a whole, which can be reused, reducing the cost of engineering consumables, and at the same time avoiding the grouting components being left behind on the pipe segment wall, which may cause hidden dangers in the later tunnel operation. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a partial cross-sectional view of the present invention;

[0028] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0029] Figure 4 This is a schematic diagram of the grouting assembly structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the active grouting module structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the slurry flow path according to the present invention.

[0032] The numbers in the image represent:

[0033] 1. Grouting pipe assembly; 11. Main grouting pipe; 12. Conical pipe; 13. Rubber lining; 2. Movable grouting module; 21. Grouting assembly; 211. Device slot; 212. Grout conduit; 213. Movable grouting head; 214. Return spring; 22. Hydraulic push rod; 23. One-way valve; 24. End grout pipe; 3. Grout supply pipeline. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, which illustrate the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0035] Example:

[0036] like Figure 1-6 As shown, the present invention provides a grouting device and grouting method for tunnel segment wall backfilling, including a grouting pipe assembly 1, a movable grouting module 2, and a grout supply pipeline 3;

[0037] After the grouting pipe assembly 1 is drilled into the tunnel segment wall, the movable grouting module 2 is set inside the grouting pipe assembly 1. The movable grouting module 2 moves along the inside of the grouting pipe assembly 1 to adjust its relative position inside the grouting pipe assembly 1, thereby adjusting the grouting point. The grout supply pipeline 3 is sleeved into the inside of the grouting pipe assembly 1 through the end opening of the grouting pipe assembly 1, and the end of the grouting pipe assembly 1 is connected to the movable grouting module 2. The grout supply pipeline 3 is used to supply grout to the movable grouting module 2.

[0038] Grouting pipe assembly 1 includes a main grouting pipe 11 and a cone pipe 12. The main grouting pipe 11 has several grouting points inside, and each grouting point consists of several annular grouting holes on the surface of the main grouting pipe 11. The cone pipe 12 is welded to the bottom end of the main grouting pipe 11, and several grouting holes are opened on the surface of the cone pipe 12. During grouting, the grouting pipe assembly 1 is inserted into the tunnel segment wall through external equipment, and the cone pipe 12 is used to break through the soil layer.

[0039] The top cover plate of the main grouting pipe 11 is threaded. In use, the top cover plate is installed at the end of the main grouting pipe 11 by means of threaded connection.

[0040] The grouting pipe assembly 1 also includes a rubber liner 13, which is attached to the inner wall of the main grouting pipe 11. The rubber liner 13 and the grouting holes on the surface of the main grouting pipe 11 are provided with through holes at corresponding positions. The opening edges of the through holes are arc-shaped. The inner wall of the rubber liner 13 is provided with a vertical guide groove, which is vertically connected to the through holes inside the rubber liner 13. The through holes and the vertical guide groove are used to adapt to the movable grouting module 2.

[0041] The movable grouting module 2 includes a grouting assembly 21, hydraulic push rods 22, a one-way valve 23, and an end grout pipe 24. The grouting assembly 21 is located inside the main grouting pipe 11 and consists of an inner ring for connecting the grout supply pipe 3 and an outer ring for grouting. Several sets of hydraulic push rods 22 are installed at equal intervals within the outer ring of the grouting assembly 21. The movable end of the hydraulic push rod 22 is connected to the top of the inner wall of the main grouting pipe 11. The one-way valve 23 is installed at the bottom of the grouting assembly 21 and has several sub-grout outlets at its bottom. The location and number of the sub-grout outlets correspond to the grouting openings on the surface of the cone pipe 12. The positions and number of grout holes are consistent, and the number of end grout pipes 24 is consistent with the number of sub-grout outlets. Several sets of end grout pipes 24 are set one-to-one at the bottom of the grout outlet. During grouting, the external grouting equipment supplies grout to the grouting assembly 21 through the grouting pipeline 3. The grouting assembly 21 delivers the grout to the soil layer outside the main grouting pipe 11 through the grouting holes on the surface of the main grouting pipe 11. When the grouting pressure reaches the opening pressure of the one-way valve 23, the grouting assembly 21 distributes the grout into each end grout pipe 24 through the one-way valve 23. The end grout pipes 24 deliver the grout to the soil layer outside the cone pipe 12 through the grouting holes on the surface of the cone pipe 12.

[0042] The movable length of the hydraulic push rod 22 is consistent with the internal length of the main grouting pipe 11. The main grouting pipe 11 is divided into several working strokes, and the spacing between each working stroke matches the configuration of each grouting point. Before the grouting pipe assembly 1 is sent into the soil layer, the hydraulic push rod 22 extends to push the grouting assembly 21 to the bottom grouting point of the main grouting pipe 11. At this time, the end of the end grout pipe 24 extends from the grouting hole on the surface of the cone pipe 12 to the outside of the cone pipe 12. After the grouting assembly 21 completes the grouting at the bottom grouting point of the main grouting pipe 11, and the one-way valve 23 and the end grout pipe 24 complete the grouting of the soil layer outside the cone pipe 12, the hydraulic push rod 22 retracts, so that the grouting assembly 21 moves to the previous grouting point for grouting. During this grouting process, the grouting pressure is less than the opening pressure of the one-way valve 23.

[0043] The grouting assembly 21 includes a device groove 211, a grout conduit 212, a movable grouting head 213, and a return spring 214. The number of device grooves 211 is the same as the number of grouting holes annularly formed on the surface of the main grouting pipe 11. Several sets of device grooves 211 are evenly spaced in the middle of the grouting assembly 21. The grout conduit 212 is installed inside the device groove 211 and is connected to the inner ring portion of the grouting assembly 21. The movable grouting head 213 is sleeved on... Outside the slurry conduit 212, a movable grouting head 213 forms an extendable grouting channel in conjunction with the slurry conduit 212. A return spring 214 is sleeved outside the slurry conduit 212, with its two ends respectively contacting the device groove 211 and the movable grouting head 213. The movable grouting head 213 is pushed by the return spring 214. The end of the movable grouting head 213 is arc-shaped, matching the through hole in the rubber liner 13. The number of vertical grooves opened inside the rubber liner 13 is... Matching the number of movable grouting heads 213, and with the rubber liner 13 nested within the vertical groove, when the grouting assembly 21 moves to the grouting point, the return spring 214 pushes the movable grouting head 213 to move along the grout conduit 212. The end of the movable grouting head 213 is embedded in the through hole of the rubber liner 13. At this time, the rubber liner 13 and the movable grouting head 213 form a sealed connection. The grouting assembly 21 can then inject grout through the grouting hole into the soil layer outside the main grouting pipe 11 through the cooperation of the grout conduit 212 and the movable grouting head 213. After grouting is completed, the grouting assembly 21 continues to move to the next grouting point. When the grouting assembly 21 moves, the movable grouting head 213 moves synchronously under the drive of the grouting assembly 21. During the synchronous movement, the movable grouting head 213 abuts against the edge of the through hole of the rubber liner 13. Through this abutment, the return spring 214 retracts along the grout conduit 212 into the device groove 211.

[0044] The grout supply pipeline 3 is a spliced ​​configuration, consisting of several sub-sections connected by threads. During grouting, multiple sub-sections can be selected for assembly and splicing according to the grouting space to adapt to different grouting spaces.

[0045] The method of using the tunnel segment backfill grouting device includes the following steps:

[0046] Step S1: Control the hydraulic push rod 22 to fully extend and push the grouting assembly 21 to the bottom grouting point of the main grouting pipe 11. The reset spring 214 pushes the movable grouting protrusion head 213 into the through hole of the rubber liner 13 to form a sealed grouting channel. The end of the end grout pipe 24 passes through the grouting hole of the tapered pipe 12 and extends to the outside of the tapered pipe 12.

[0047] Step S2: The grouting pipe assembly 1 is pushed into the tunnel segment wall by hydraulic equipment. The cone pipe 12 of the grouting pipe assembly 1 breaks through the soil layer until the main grouting pipe 11 is laid in the target grouting area behind the tunnel segment wall. The top cover plate of the main grouting pipe 11 is removed by rotation. Water in the soil layer behind the wall enters the main grouting pipe 11 through the grouting hole on the surface of the main grouting pipe 11. The water entering the main grouting pipe 11 is discharged naturally along the inner wall of the main grouting pipe 11. When no more water is discharged, the top cover plate is reinstalled at the end of the main grouting pipe 11.

[0048] Step S3: Select the corresponding number of grouting pipe 3 sub-segments according to the construction space behind the tunnel segment wall, and assemble them by thread splicing to obtain grouting pipe 3. Connect the assembled grouting pipe 3 from the end opening of the grouting pipe group 1 and connect it to the movable grouting module 2.

[0049] Step S4: Start the external grouting equipment and deliver grouting slurry to the grouting assembly 21 through the grouting supply pipeline 3; Under the action of grouting pressure lower than the opening pressure of the one-way valve 23, the slurry is injected into the surrounding strata through the slurry conduit 212 and the movable grouting protrusion head 213, and injected into the grouting hole in the main grouting pipe 11 to complete the circumferential grouting at this point.

[0050] Step S5: Increase the grouting pressure to the opening pressure of the one-way valve 23. The grout enters the grout pipes 24 at each end through the one-way valve 23 and the bottom soil layer is grouted through the grouting hole at the cone pipe 12.

[0051] Step S6: After completing the grouting operation at the current point, stop grouting, control the hydraulic push rod 22 to retract, and drive the grouting component 21 to move upward to the next grouting point. During the movement, the edge of the through hole of the rubber liner 13 squeezes the movable grouting protrusion 213, compressing the return spring 214 to retract it into the device groove 211. After reaching the target grouting point, the return spring 214 pushes the movable grouting protrusion 213 again to seal and connect with the through hole of the rubber liner 13, and repeats the grouting operation process to complete the segmented grouting of each grouting point in sequence.

[0052] Step S7: After all the preset grouting points have been grouted, stop the grouting equipment supply, disconnect the grouting pipeline 3 from the movable grouting module 2, disassemble and recycle the grouting pipeline 3 in sections, and pull out the grouting pipe assembly 1 together with the internal movable grouting module 2 using external tools to complete the recycling of the entire set of equipment and end the wall grouting construction.

[0053] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A grouting device behind tunnel segment walls, characterized in that, It includes grouting pipe assembly (1), movable grouting module (2), and grout supply pipeline (3). After the grouting pipe assembly (1) is drilled into the tunnel segment wall, the movable grouting module (2) is set inside the grouting pipe assembly (1). The movable grouting module (2) moves along the inside of the grouting pipe assembly (1) to adjust its relative position inside the grouting pipe assembly (1) and thus adjust the grouting point. The grout supply pipeline (3) is sleeved into the inside of the grouting pipe assembly (1) through the end opening of the grouting pipe assembly (1), and the end of the grouting pipe assembly (1) is connected to the movable grouting module (2). The grout supply pipeline (3) is used to supply grout to the movable grouting module (2).

2. The tunnel segment wall backfilling grouting device as described in claim 1, characterized in that, The grouting pipe assembly (1) includes a main grouting pipe (11) and a conical pipe (12). The main grouting pipe (11) has several grouting points inside, and each grouting point is composed of several grouting holes that are opened in a ring on the surface of the main grouting pipe (11). The conical pipe (12) is welded to the bottom end of the main grouting pipe (11), and several grouting holes are opened on the surface of the conical pipe (12). The top of the main grouting pipe (11) is threaded with a cover plate.

3. The tunnel segment wall backfilling grouting device as described in claim 2, characterized in that, The grouting pipe assembly (1) also includes a rubber liner (13), which is attached to the inner wall of the main grouting pipe (11). The rubber liner (13) and the grouting holes on the surface of the main grouting pipe (11) are provided with through holes, and the opening edge of the through holes is arc-shaped.

4. The tunnel segment wall backfilling grouting device as described in claim 3, characterized in that, The inner wall of the rubber liner (13) is provided with a vertical guide groove, which is vertically connected to a through hole opened inside the rubber liner (13).

5. The tunnel segment wall backfilling grouting device as described in claim 1, characterized in that, The active grouting module (2) includes a grouting assembly (21), hydraulic push rods (22), a one-way valve (23), and an end grout pipe (24). The grouting assembly (21) is located inside the main grouting pipe (11). The grouting assembly (21) consists of an inner ring for connecting the grout supply pipe (3) and an outer ring for grouting. Several sets of hydraulic push rods (22) are provided, and the several sets of hydraulic push rods (22) are installed at equal intervals in the outer ring portion of the grouting assembly (21). The movable end of the rod (22) is connected to the top of the inner wall of the main grouting pipe (11). The one-way valve (23) is installed at the bottom of the grouting assembly (21). The bottom of the one-way valve (23) is provided with several sub-grouting ports. The position and number of the sub-grouting ports are consistent with the position and number of the grouting holes opened on the surface of the cone pipe (12). The number of end grouting pipes (24) is consistent with the number of sub-grouting ports. Several sets of end grouting pipes (24) are arranged one-to-one at the bottom of the grouting port.

6. The tunnel segment wall backfilling grouting device as described in claim 5, characterized in that, The movable length of the hydraulic push rod (22) is consistent with the internal length of the main grouting pipe (11). The main grouting pipe (11) is divided into several working strokes, and the spacing between each working stroke matches the configuration of each grouting point.

7. The tunnel segment wall backfilling grouting device as described in claim 5, characterized in that, The grouting assembly (21) includes a device slot (211), a grout conduit (212), a movable grouting head (213), and a return spring (214). The number of device slots (211) is the same as the number of grouting holes annularly opened on the surface of the main grouting pipe (11). Several sets of device slots (211) are equally spaced in the middle of the grouting assembly (21). The grout conduit (212) is installed inside the device slot (211), and the grout conduit (212) is connected to the grouting assembly. The inner ring of component (21) is connected, the movable grouting head (213) is sleeved on the outside of the grout conduit (212), the movable grouting head (213) and the grout conduit (212) form an extendable grouting channel, the reset spring (214) is sleeved on the outside of the grout conduit (212), and the two ends of the reset spring (214) abut against the device groove (211) and the movable grouting head (213) respectively, and the movable grouting head (213) is pushed by the reset spring (214).

8. The tunnel segment wall backfilling grouting device as described in claim 7, characterized in that, The end of the movable grouting head (213) is arc-shaped to cooperate with the through hole in the rubber liner (13). The number of vertical grooves opened inside the rubber liner (13) matches the number of movable grouting heads (213), and the rubber liner (13) is nested in the vertical groove.

9. A tunnel segment wall backfilling grouting device as described in claim 7, characterized in that, The grout supply pipeline (3) is a spliced ​​configuration, and the grout supply pipeline (3) is composed of several sub-segments connected by threads.

10. A method of using the tunnel segment backfill grouting device according to any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Control the hydraulic push rod (22) to fully extend and push the grouting assembly (21) to move to the bottom grouting point of the main grouting pipe (11). The reset spring (214) pushes the movable grouting protrusion head (213) into the through hole of the rubber liner (13) to form a sealed grouting channel. The end of the end grout pipe (24) passes through the grouting hole of the tapered pipe (12) and extends to the outside of the tapered pipe (12). Step S2: The grouting pipe assembly (1) is pushed into the tunnel segment wall by hydraulic equipment. The cone pipe (12) of the grouting pipe assembly (1) breaks through the soil layer until the main grouting pipe (11) is laid in the target grouting area behind the tunnel segment wall. Rotate to remove the top cover plate of the main grouting pipe (11). Water in the soil behind the wall enters the main grouting pipe (11) through the grouting holes on the surface of the main grouting pipe (11). The water that enters the main grouting pipe (11) is discharged naturally along the inner wall of the main grouting pipe (11). When no more water is discharged, reinstall the top cover plate back to the end of the main grouting pipe (11). Step S3: Select the corresponding number of grouting pipe (3) sub-segments according to the construction space behind the tunnel segment wall, and assemble them by thread splicing to obtain the grouting pipe (3). Connect the assembled grouting pipe (3) from the end opening of the grouting pipe group (1) and connect it to the movable grouting module (2). Step S4: Start the external grouting equipment and deliver grouting slurry to the grouting assembly (21) through the grout supply pipeline (3); under the action of grouting pressure lower than the opening pressure of the one-way valve (23), the slurry passes through the slurry conduit (212) and the movable grouting protrusion (213), and is injected into the surrounding strata through the grouting hole in the main grouting pipe (11) to complete the circumferential grouting at this point; Step S5: Increase the grouting pressure to the opening pressure of the one-way valve (23). The grout enters the grout pipes (24) at each end through the one-way valve (23) and the bottom soil layer is grouted through the grouting hole at the cone pipe (12). Step S6: After completing the grouting operation at the current point, stop grouting, control the hydraulic push rod (22) to retract, and drive the grouting component (21) to move upward to the next grouting point. During the movement, the edge of the through hole of the rubber liner (13) squeezes the movable grouting protrusion (213), compresses the reset spring (214) to retract it into the device slot (211); after reaching the target grouting point, the reset spring (214) pushes the movable grouting protrusion (213) again to seal and connect with the through hole of the rubber liner (13), repeat the grouting operation process, and complete the segmented grouting of each grouting point in sequence; Step S7: After all the preset grouting points have been grouted, stop the grouting equipment from supplying grout, disconnect the grouting pipeline (3) from the movable grouting module (2), disassemble and recycle the grouting pipeline (3) in sections, and pull out the grouting pipe group (1) together with the internal movable grouting module (2) using external tools to complete the recycling of the entire set of equipment and end the wall grouting construction.

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