A device for backfill grouting of a tunnel vault and its construction method

Abstract

The present invention provides a tunnel vault backfill grouting device and a construction method thereof, including a grouting device body. The grouting device body includes a fixing component, a grouting component, an exhaust mechanism and an air extraction mechanism. A sealing ring is provided at the front end of the fixing component. The sealing ring is fixed to the outside of the tunnel vault backfill area by using bolts. The grouting component passes through the inside of the fixing component, and the surface of the grouting component is in contact with the inner side of the sealing ring. This tunnel vault backfill grouting device and its construction method convey the slurry to the inside through a grouting pipe with a longer slurry outlet, reducing the probability of blockage and improving the grouting efficiency. Once some of the slurry outlets are blocked by concrete and unable to discharge slurry evenly, the motor outside can be used to control the movement of the scraper to clean the slurry outlets, preventing the slurry outlets from being blocked and ensuring that the backfill process can be carried out efficiently and smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and particularly to a backfill grouting device for the arch crown of a tunnel and its construction method. Background Art

[0002] In the later stage of tunnel construction, it is necessary to carry out grouting backfill treatment on the gap inside the arch crown of the tunnel. In this process, corresponding grouting devices are required, including grouting pipes and exhaust pipes for discharging the inside of the backfill space. In the prior art, it is directly injected into the backfill space from the inside of the grouting pipe through an external concrete conveying device, and the internal air is discharged outward along the exhaust pipe by the filled concrete. However, in this structure, due to the long and narrow internal space and the uneven inner wall, after the concrete is conveyed into the inside, it is easy to accumulate at the slurry outlet position. A large amount of accumulation will generate pressure on the slurry outlet, resulting in a decrease in the slurry outlet speed and slowing down the entire construction process. On the other hand, for the exhaust pipe part, due to the uneven structure at the top of the backfill passage, some higher space areas are not fully grouted in time, resulting in the slurry being discharged from the exhaust port. Therefore, the inside of the backfill space cannot be fully filled, and the residual air in the backfill space is difficult to be fully discharged, reducing the strength of the tunnel arch crown after the final backfill. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a backfill grouting device for the arch crown of a tunnel and its construction method to solve the problems raised in the above background art. The present invention can evenly inject slurry at any position in the backfill space, has a self-cleaning and dredging function, the backfill is more sufficient, and the internal air is discharged more thoroughly.

[0004] To achieve the above purpose, the present invention is realized through the following technical solutions: A backfill grouting device for the arch crown of a tunnel, including a grouting device body, the grouting device body includes a fixing component, a grouting component, an exhaust mechanism and an air extraction mechanism. A sealing ring is arranged at the front end of the fixing component, and the sealing ring is fixed to the outside of the backfill area of the tunnel arch crown by using bolts. The grouting component passes through the inside of the fixing component, and the surface of the grouting component is in contact with the inner side of the sealing ring. A connecting plate is installed on the side of the sealing ring, and the other end of the connecting plate is installed with an exhaust mechanism. A plurality of air extraction mechanisms are arranged inside the exhaust mechanism, and each air extraction mechanism penetrates upward from the top of the exhaust mechanism. A threaded rod is arranged at the top of the grouting component, and a motor is installed at the end of the threaded rod. The motor is fixedly installed outside the tunnel arch crown.

[0005] Further, the grouting component is mainly composed of a grouting pipe. A docking plate is arranged at the front end of the grouting pipe, and slurry outlets are arranged at the top of the grouting pipe.

[0006] Further, the fixing component includes a plugging ring and a fixing sleeve. A notch is formed at the top of the fixing sleeve. A scraper is inserted into the notch. A threaded sleeve is installed at the top of the scraper, and the threaded rod passes through the threaded sleeve.

[0007] Further, the notch and the slurry outlet are on the same vertical plane. The bottom end of the scraper penetrates into the inside of the grouting pipeline successively from the notch of the fixing sleeve and the slurry outlet.

[0008] Further, the exhaust mechanism includes a ventilation outer pipeline and a ventilation inner pipeline. External docking holes are formed on the surface of the ventilation outer pipeline. The ventilation inner pipeline is inserted into the ventilation outer pipeline, and the air extraction mechanism is evenly distributed on the inner side of the ventilation inner pipeline.

[0009] Further, a drill bit is installed at the end of the ventilation outer pipeline. The surface diameter of the ventilation inner pipeline is the same as the inner wall diameter of the ventilation outer pipeline. Internal docking holes are formed on the surface of the ventilation inner pipeline, and the air extraction mechanism penetrates outwards successively from the internal docking holes and the external docking holes.

[0010] Further, an inlet thin tube is arranged at the top of the air extraction mechanism. An air inlet is formed at the top of the inlet thin tube. A sealing substrate is installed at the bottom end of the inlet thin tube, and a spring is connected to the bottom end of the sealing substrate.

[0011] Further, a support collar is arranged at the bottom end of the inner wall of the ventilation inner pipeline. The bottom end of the spring is sleeved outside the support collar, and the bottom of the spring is fixedly connected to a part of the inner wall of the ventilation inner pipeline.

[0012] Further, a construction method for backfill grouting of the tunnel crown includes the above-mentioned grouting device body part, and the construction process is carried out according to the following steps: Step 1: Insert the ventilation outer pipeline and the fixing sleeve for grouting into the inner backfill space from the outside of the tunnel crown; Step 2: Insert the ventilation inner pipeline; Step 3: Rotate the ventilation inner pipeline to pop out the air extraction mechanism outwards; Step 4: Insert the grouting pipeline and connect it to an external feeding device and then carry out the grouting process; Step 5: Stop grouting until a large amount of slurry overflows outside the ventilation inner pipeline, and seal the fixing sleeve.

[0013] Further, in Step 4, a cleaning structure is arranged at the top of the grouting pipeline, and the rotation of the motor is controlled according to the change of the injection speed during the grouting process to clean the top of the grouting pipeline. During the process of inserting the ventilation inner pipeline into the ventilation outer pipeline, the top of the air extraction mechanism needs to be blocked by the inner wall of the ventilation outer pipeline.

[0014] Advantages of the present invention: A tunnel vault backfill grouting device and its construction method of the present invention include a fixing component, a grouting component, an exhaust mechanism, an air extraction mechanism, a ventilation outer pipe, a ventilation inner pipe, an external docking hole, a drill bit, an internal docking hole, an introduction thin pipe, an air inlet, a sealing substrate, a spring, a support collar, a grouting pipe, a slurry outlet, a docking plate, a fixed sleeve, a plugging ring, a connecting plate, a notch, a threaded rod, a threaded sleeve, a scraper, and a motor.

[0015] 1. The tunnel vault backfill grouting device and its construction method can transport the slurry to the inside through a grouting pipe with a longer slurry outlet, thereby reducing the concentration of the slurry at the slurry outlet area after long-term grouting to a certain extent, improving the construction efficiency, and reducing the probability of plugging.

[0016] 2. Once part of the slurry outlet of the tunnel vault backfill grouting device and its construction method is blocked by concrete and cannot discharge the slurry evenly, the scraper can be controlled to move by an external motor, thereby cleaning the slurry outlet, preventing the slurry outlet from being blocked, and ensuring that the backfill process can be carried out efficiently and smoothly.

[0017] 3. The tunnel vault backfill grouting device and its construction method are provided with an inner and outer double-layer pipe in the exhaust mechanism, and with the help of a plurality of air extraction mechanisms, the air inside the backfill space can be discharged from multiple different positions at the top, reducing the amount of residual air inside after backfill, and improving the overall strength of the vault. Description of the Drawings

[0018] Figure 1 is a flow chart of a tunnel vault backfill grouting construction method of the present invention;

[0019] Figure 2 is a structural schematic diagram of a tunnel vault backfill grouting device of the present invention;

[0020] Figure 3 is a structural schematic diagram of the exhaust mechanism part of a tunnel vault backfill grouting device of the present invention;

[0021] Figure 4 is a sectional view of the exhaust mechanism part of a tunnel vault backfill grouting device of the present invention;

[0022] Figure 5 is a structural diagram of the fixing component of a tunnel vault backfill grouting device of the present invention;

[0023] In the figure: 1. Fixed component; 2. Grouting component; 3. Exhaust mechanism; 4. Air extraction mechanism; 5. Ventilation outer pipe; 6. Ventilation inner pipe; 7. External docking hole; 8. Drill bit; 9. Internal docking hole; 10. Introduction capillary tube; 11. Air inlet; 12. Sealing substrate; 13. Spring; 14. Support collar; 15. Grouting pipe; 16. Grout outlet; 17. Docking plate; 18. Fixed sleeve; 19. Sealing ring; 20. Connection plate; 21. Notch; 22. Threaded rod; 23. Threaded sleeve; 24. Scraper; 25. Motor. Detailed implementation manners

[0024] To make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0025] Please refer to Figures 1 to 5 , the present invention provides a technical solution: a tunnel crown backfill grouting device, including a grouting device body. The grouting device body includes a fixed component 1, a grouting component 2, an exhaust mechanism 3 and an air extraction mechanism 4. A sealing ring 19 is provided at the front end of the fixed component 1. The sealing ring 19 is fixed to the outside of the tunnel crown backfill area by using bolts. The grouting component 2 passes through the inside of the fixed component 1, and the surface of the grouting component 2 is in contact with the inner side of the sealing ring 19. A connection plate 20 is installed on the side of the sealing ring 19, and an exhaust mechanism 3 is installed at the other end of the connection plate 20. A plurality of air extraction mechanisms 4 are provided inside the exhaust mechanism 3. Each air extraction mechanism 4 passes upward from the top of the exhaust mechanism 3. A threaded rod 22 is provided at the top of the grouting component 2, and a motor 25 is installed at the end of the threaded rod 22. The motor 25 is fixedly installed outside the tunnel crown. The tunnel crown backfill grouting device inserts the grouting component 2 into the tunnel crown backfill space, and at the same time installs the exhaust mechanism 3 on the side of the grouting component 2. After connecting the outer end of the grouting component 2 to an external concrete conveying device, the concrete slurry can be conveyed along the grouting pipe 15 into the tunnel crown backfill space for grouting operation. During the grouting process, the grouting component 2 is cleaned in real time by controlling the rotation of the motor 25 until the backfill space is completely filled, then the threaded rod 22 can be removed, and the fixed component 1 and the exhaust mechanism 3 are sealed.

[0026] In this embodiment, the grouting assembly 2 is mainly composed of a grouting pipeline 15. A docking plate 17 is provided at the front end of the grouting pipeline 15. A slurry outlet 16 is formed at the top of the grouting pipeline 15. The fixing assembly 1 includes a sealing ring 19 and a fixing sleeve 18. A notch 21 is formed at the top of the fixing sleeve 18. A scraping plate 24 is inserted into the notch 21. A threaded sleeve 23 is installed at the top of the scraping plate 24. A threaded rod 22 passes through the threaded sleeve 23. The notch 21 and the slurry outlet 16 are in the same vertical plane. The bottom end of the scraping plate 24 penetrates into the grouting pipeline 15 from the notch 21 of the fixing sleeve 18 and the slurry outlet 16 in sequence. By using the grouting pipeline 15 with a longer slurry outlet 16 to convey the slurry to the inside, it can, to a certain extent, reduce the concentration of the slurry at the area of the slurry outlet 16 after long-term grouting, improve the construction progress of the entire backfill grouting process, and reduce the probability of blockage. Specifically, after connecting the external grouting equipment to the front end of the grouting pipeline 15, the concrete slurry can be conveyed to the inside, and the high-pressure concrete moves backward along the conveying pipeline. During the flowing process, it can be discharged through the long-strip slurry outlet 16 at the top.

[0027] In this embodiment, the exhaust mechanism 3 includes an air vent outer pipeline 5 and an air vent inner pipeline 6. External docking holes 7 are formed on the surface of the air vent outer pipeline 5. The air vent inner pipeline 6 is inserted into the air vent outer pipeline 5. The air extraction mechanisms 4 are evenly distributed inside the air vent inner pipeline 6. A drill bit 8 is installed at the end of the air vent outer pipeline 5. The surface diameter of the air vent inner pipeline 6 is the same as the inner wall diameter of the air vent outer pipeline 5. Internal docking holes 9 are formed on the surface of the air vent inner pipeline 6. The air extraction mechanisms 4 penetrate outward from the internal docking holes 9 and the external docking holes 7 in sequence. When inserting the air vent inner pipeline 6 into the air vent outer pipeline 5, the internal docking holes 9 and the external docking holes 7 need to be staggered. When each air extraction mechanism 4 is inserted into the air vent outer pipeline 5, pressure needs to be applied to it to accommodate it inside the air vent inner pipeline 6, so as to facilitate the subsequent ejection of each air extraction mechanism 4 from the corresponding external docking holes 7 outward.

[0028] In this embodiment, the top of the air outlet mechanism 4 is provided with an introduction capillary 10, the top of the introduction capillary 10 is provided with an air inlet 11, the bottom end of the introduction capillary 10 is installed with a sealing substrate 12, the bottom end of the sealing substrate 12 is connected with a spring 13, the bottom end of the inner wall of the ventilation inner pipe 6 is provided with a support collar 14, the bottom end of the spring 13 is sleeved on the outside of the support collar 14, and the bottom of the spring 13 is fixedly connected to the inner wall of the ventilation inner pipe 6, and an inner and outer double-layer pipe is provided in the exhaust mechanism 3. By inserting the ventilation inner pipe 6 into the interior of the ventilation outer pipe 5, and then using multiple air outlet mechanisms 4, the space inside the backfill space can be filled from the top multiple The air is discharged outwardly from different positions, and the air outlet mechanism 4 can be automatically adjusted to a certain extent according to the different top heights at different positions, further reducing the amount of residual air inside after backfilling, making the slurry injected into the tunnel arch more sufficient and comprehensive, and improving the overall strength of the arch. After each air outlet mechanism 4 is pushed into the ventilation inner pipe 6 in a stored state, and the entire ventilation inner pipe 6 is pushed into the ventilation outer pipe 5, the ventilation inner pipe 6 can be directly rotated to align the external docking hole 7 and the internal docking hole 9. At the moment of alignment, each introduction capillary 10 can be popped out from the ventilation outer pipe 5 under the action of the spring 13 to communicate with the inside of the tunnel backfill space.

[0029] The present embodiment also provides a tunnel vault backfill grouting construction method, which includes the above-mentioned grouting device body part, and its construction process is carried out according to the following steps: step 1, inserting the ventilation outer pipe 5 and the fixed sleeve 18 for grouting from the outside of the tunnel vault back into the internal backfill space; step 2, inserting the ventilation inner pipe 6, and during the process of inserting the ventilation inner pipe 6 into the ventilation outer pipe 5, the top of the air outlet mechanism 4 needs to be blocked by the inner wall of the ventilation outer pipe 5; step 3, rotating the ventilation inner pipe 6 to eject the air outlet mechanism 4 outward; step 4, inserting the grouting pipe 15 and connecting it to the external feeding equipment to carry out the grouting process, and a cleaning structure is provided at the top of the grouting pipe 15. The injection speed changes during the process control the motor 25 to rotate and clean the top of the grouting pipe 15; step five, grouting until a large amount of slurry overflows from the outside of the ventilation inner pipe 6, then the grouting can be stopped, and the fixed sleeve 18 can be closed. Once part of the slurry outlet 16 is blocked by concrete and the slurry cannot be discharged evenly, the external motor 25 can be used to control the movement of the scraper 24 to clean the slurry outlet 16. This process can be controlled from the outside to avoid blockage of the slurry outlet 16, ensuring that the backfilling process can be carried out efficiently and smoothly. When the fixed sleeve 18 is installed, the threaded sleeve 23 will be installed inside at the same time. After the threaded rod 22 is inserted into the threaded sleeve 23, the scraper 24 can be controlled from the outside to move along the slurry outlet 16.

[0030] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0031] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. A person skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A backfill grouting device for the vault of a tunnel, comprising a main body of the grouting device, characterized in that: The grouting device body includes a fixing component (1), a grouting component (2), an exhaust mechanism (3), and an air extraction mechanism (4). A sealing ring (19) is provided at the front end of the fixing component (1). The sealing ring (19) is fixed to the outside of the backfill area of the tunnel crown by using bolts. The grouting component (2) passes through the inside of the fixing component (1), and the surface of the grouting component (2) is in contact with the inner side of the sealing ring (19). A connecting plate (20) is installed on the side of the sealing ring (19), and the other end of the connecting plate (20) is installed with an exhaust mechanism (3). A plurality of air extraction mechanisms (4) are provided inside the exhaust mechanism (3). Each air extraction mechanism (4) passes upward from the top of the exhaust mechanism (3). A threaded rod (22) is provided at the top of the grouting component (2), and a motor (25) is installed at the end of the threaded rod (22). The motor (25) is fixedly installed outside the tunnel crown; The grouting component (2) is mainly composed of a grouting pipe (15). A docking plate (17) is provided at the front end of the grouting pipe (15). A slurry outlet (16) is opened at the top of the grouting pipe (15); The fixing component (1) includes a sealing ring (19) and a fixing sleeve (18). A notch (21) is opened at the top of the fixing sleeve (18). A scraping plate (24) is inserted into the notch (21). A threaded sleeve (23) is installed at the top of the scraping plate (24). The threaded rod (22) passes through the inside of the threaded sleeve (23); The notch (21) and the slurry outlet (16) are in the same vertical plane. The bottom end of the scraping plate (24) penetrates into the inside of the grouting pipe (15) successively from the notch (21) of the fixing sleeve (18) and the slurry outlet (16); The exhaust mechanism (3) includes an air vent outer pipe (5) and an air vent inner pipe (6). External docking holes (7) are opened on the surface of the air vent outer pipe (5). The air vent inner pipe (6) is inserted into the inside of the air vent outer pipe (5). The air extraction mechanisms (4) are evenly distributed inside the air vent inner pipe (6); A drill bit (8) is installed at the end of the air vent outer pipe (5). The surface diameter of the air vent inner pipe (6) is the same as the inner wall diameter of the air vent outer pipe (5). Internal docking holes (9) are opened on the surface of the air vent inner pipe (6). The air extraction mechanisms (4) pass outward from the internal docking holes (9) and the external docking holes (7) in sequence; An inlet thin pipe (10) is provided at the top of the air extraction mechanism (4). An air inlet (11) is opened at the top of the inlet thin pipe (10). A sealing substrate (12) is installed at the bottom end of the inlet thin pipe (10). A spring (13) is connected to the bottom end of the sealing substrate (12).

2. The backfill grouting device for the tunnel vault according to claim 1, characterized in that: A support collar (14) is provided at the bottom end of the inner wall of the air vent inner pipe (6). The bottom end of the spring (13) is sleeved outside the support collar (14), and the bottom of the spring (13) is fixedly connected to a part of the inner wall of the air vent inner pipe (6).

3. A construction method for backfill grouting of a tunnel vault, characterized in that: This method uses a backfill grouting device for the tunnel vault as described in claim 2, and its construction process is carried out according to the following steps: Step 1, insert the ventilation outer pipe (5) and the fixed sleeve (18) for grouting from the outside of the backfill area of the tunnel vault into the internal backfill space; Step 2, insert the ventilation inner pipe (6); Step 3, rotate the ventilation inner pipe (6) to pop out the air extraction mechanism (4) outward; Step 4, insert the grouting pipe (15) and connect it to the external feeding equipment and then carry out the grouting process; Step 5, stop grouting until a large amount of slurry overflows outside the ventilation inner pipe (6), and seal the fixed sleeve (18).

4. A construction method for backfill grouting of a tunnel vault according to claim 3, characterized in that: In step 4, a cleaning structure is provided at the top of the grouting pipe (15), and the motor (25) is controlled to rotate according to the change of the injection speed during the grouting process to clean the top of the grouting pipe (15). During the process of inserting the ventilation inner pipe (6) into the ventilation outer pipe (5), the top of the air extraction mechanism (4) needs to be blocked by the inner wall of the ventilation outer pipe (5).

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