A radial grouting device and method for a tunnel

Abstract

The present invention provides a radial grouting device and method for a tunnel, which are carried out according to the following steps: Step 1, plan the grouting layer; Step 2, uniformly arrange grout stop components and pressure detection components along the grouting layer; Step 3, insert grouting pipes along each grout stop component; Step 4, carry out the grouting process; Step 5, judge the flow condition of the cement mortar inside the grouting layer according to the display status of the pressure detection components; Step 6, seal the grout stop components and let it stand for a period of time to solidify the internal cement mortar. The radial grouting device and method for the tunnel fix the grouting pipes by using the grout stop components and enable them to rotate at a certain angle. Therefore, according to the uniformly arranged pressure detection components, the injection condition of the cement mortar at each position can be judged, and thus the spraying angle of the grouting can be adjusted in real time outside, so that the cement mortar can flow more uniformly around, improving the pressure uniformity of the later cement mortar.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and specifically to a radial grouting device and method for a tunnel Background Technique

[0002] The grouting technique plays an important role in aspects such as underground structure anti-seepage, foundation pit reinforcement, prevention of ground settlement, foundation treatment of existing structures, and friction reduction during pipe jacking. For tunnel engineering, grouting has filling, reinforcement, and anti-seepage effects. A large amount of cement mortar will be pumped into the grouting area during grouting. In the prior art, when carrying out the grouting project for the radial grouting area at the top of the tunnel, the grouting pipe is often directly inserted into the tunnel grouting area. However, due to the uneven surface of the inner wall of the grouting area, after the grouting pipe is inserted into it, a large number of gaps will be generated between the surface of the grouting pipe and the inner wall of the tunnel. Therefore, a relatively large pressure will be generated in the later stage of grouting, and this pressure will cause the cement mortar to ooze out at the edge of the grouting pipe. On the other hand, in the existing grouting schemes, it is impossible to accurately and effectively judge whether the injection of cement mortar in the grouting area within the radial range is uniform. Therefore, it is also impossible to adjust the injection direction in real time according to the flow state of the cement mortar inside, resulting in uneven mortar pressure inside after the final grouting. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a radial grouting device and method for a tunnel to solve the problems raised in the above background technique. The present invention improves the sealing performance after the grouting pipe is inserted, improves the anti-seepage effect, can freely adjust the grouting direction during the grouting process, and makes the grouting more uniform.

[0004] To achieve the above purpose, the present invention is realized through the following technical solutions: A radial grouting method for a tunnel is carried out according to the following steps: Step 1: Determine the range of the grouting area on the inner side of the tunnel to be constructed and plan the grouting layer; Step 2: Uniformly arrange the grout stop components and pressure detection components along the grouting layer; Step 3: Insert the grouting pipes along each grout stop component, and use the connection structure to dock and fix the grouting pipes with the grout stop components; Step 4: Connect the bottom of the grouting pipes to a pressure pump and a conveying device to carry out the grouting process; Step 5: Judge the flow condition of the cement mortar inside the grouting layer according to the state displayed by the pressure detection components; Step 6: Remove the grouting pipes, seal the grout stop components, and after standing for a period of time to make the internal cement mortar solidify, weld and seal the bottom of the grout stop components.

[0005] Furthermore, in the second step, the grout stop components and pressure detection components are distributed along the radial direction of the tunnel, and multiple pressure detection components are installed between every two adjacent grout stop components. In the sixth step, only the grouting pipes are withdrawn after the grouting is completed, while the grout stop components and pressure detection components are always sealed in the grouting layer.

[0006] A grouting device used in a radial grouting method for a tunnel, comprising a grouting pipe, a grout stop assembly and a pressure detection assembly. The grout stop assembly and the pressure detection assembly are both fixedly installed on the inner wall of the tunnel. The grouting layer is arranged at the top of the inner wall of the tunnel, and the outer wall of the tunnel is arranged at the top of the grouting layer. The bottom end of the grout stop assembly is provided with a grout stop pressing plate, and the grout stop assembly is fixed at the inner wall of the tunnel by using bottom bolts to pass through the grout stop pressing plate. The top end of the grouting pipe penetrates upward into the grout stop assembly from the middle position of the grout stop pressing plate. The bottom end of the pressure detection assembly is provided with a fixing plate, a detection sleeve is arranged on the top of the fixing plate, and an independent slurry outlet pipe is arranged inside the detection sleeve.

[0007] Further, the grout stop assembly includes a grout stop pressing plate and a grout stop sleeve. The grout stop sleeve is welded and installed at the top end of the grout stop pressing plate, and a threaded sleeve is arranged at the top end of the grout stop sleeve.

[0008] Further, a lead-out channel is arranged on the surface of the grout stop sleeve, a baffle is arranged on the inner wall of the grout stop sleeve, and the grout stop assembly is fixedly connected to the top of the grouting pipe through the threaded sleeve.

[0009] Further, a fixing hole is arranged at the top of the threaded sleeve, a top bolt is inserted into the fixing hole, the top end of the threaded sleeve is in contact with a part of the outer wall of the tunnel, and the grout stop assembly is fixedly installed on the outer wall of the tunnel by using the top bolt.

[0010] Further, a threaded post is installed at the top of the grouting pipe, a slurry outlet is arranged on the surface of the grouting pipe, the grouting pipe is screwed into the threaded sleeve through the threaded post. There are two lead-out channels, and there is one slurry outlet, and the diameter of the slurry outlet is the same as the inner diameter of the lead-out channel.

[0011] Further, a top plate is arranged on the surface of the grouting pipe, a sealing layer is attached to the surface of the top plate, the top plate presses against the bottom of the baffle through the sealing layer, and the number of the baffle and the top plate is the same. The diameter of the top plate gradually becomes larger from top to bottom.

[0012] Further, a top slurry outlet hole is arranged at the top of the detection sleeve, a positioning rod is welded and installed at the side of the top slurry outlet hole, a support plate is installed at the top of the positioning rod, and a middle slurry outlet hole and a bottom slurry outlet hole are arranged at the side of the detection sleeve.

[0013] Further, the inner sides of the middle slurry outlet hole and the bottom slurry outlet hole are respectively communicated with the independent slurry outlet pipe. An observation hole is arranged at the bottom end of the independent slurry outlet pipe. A pressure gauge is installed on the outer side of the bottom of the detection sleeve. The pressure detection assembly is installed on the inner wall of the tunnel by using screws to pass through the fixing plate.

[0014] Advantages of the present invention: A tunneling radial grouting device and method of the present invention include the device and method body, and the device and method body include a tunnel inner wall, a grouting layer, a tunnel outer wall, a pressure detection component, a grout stop component, a grouting pipe, a threaded column, a top plate, a sealing layer, a slurry outlet, a grout stop pressing plate, a bottom bolt, a grout stop sleeve, a lead-out channel, a threaded sleeve, a fixing hole, a top bolt, a baffle, a detection sleeve, a positioning rod, a support plate, a middle slurry outlet hole, a bottom slurry outlet hole, an observation hole, a fixing plate, a pressure gauge, a top slurry outlet hole, and an independent slurry pipe.

[0015] 1. The tunneling radial grouting method fixes the grouting pipe by using the grout stop component and enables it to rotate at a certain angle. Therefore, according to the uniformly arranged pressure detection components, the injection situation of the cement mortar at each position can be judged, and thus the spraying angle of the grouting can be adjusted in real time, so that the cement mortar can flow more uniformly in all directions, improving the pressure uniformity of the cement mortar in the later stage.

[0016] 2. The tunneling radial grouting device supports the grouting pipe through the grout stop component, and at the same time, sealing structures are provided between the grout stop component and the tunnel inner wall and between the grout stop component and the grouting pipe, providing a comprehensive and efficient sealing function and reducing the seepage situation at the grouting pipe during the grouting process.

[0017] 3. The tunneling radial grouting device is provided with multiple pressure detection components, which can judge the injection depth of the cement mortar at different positions before the cement mortar is filled, so that the flow information of the internal cement mortar can be obtained in advance for adjustment. Description of the Drawings

[0018] Figure 1 is the schematic diagram of a tunneling radial grouting method of the present invention;

[0019] Figure 2 is the cross-sectional view of a tunneling radial grouting device of the present invention;

[0020] Figure 3 is the schematic structural diagram of the grout stop component part of a tunneling radial grouting device of the present invention;

[0021] Figure 4 is the sectional view of the grout stop component part of a tunneling radial grouting device of the present invention;

[0022] Figure 5 is the schematic structural diagram of the pressure detection component part of a tunneling radial grouting device of the present invention;

[0023] In the figure: 1. Inner wall of the tunnel; 2. Grouting layer; 3. Outer wall of the tunnel; 4. Pressure detection component; 5. Grout stopping component; 6. Grouting pipe; 7. Threaded column; 8. Roof plate; 9. Sealing layer; 10. Grout outlet; 11. Grout stopping pressing plate; 12. Bottom bolt; 13. Grout stopping sleeve; 14. Discharge channel; 15. Threaded sleeve; 16. Fixing hole; 17. Top bolt; 18. Baffle; 19. Detection sleeve; 20. Positioning rod; 21. Support plate; 22. Middle grout outlet; 23. Bottom grout outlet; 24. Observation hole; 25. Fixing plate; 26. Pressure gauge; 27. Top grout outlet; 28. Independent grouting pipe. Detailed implementation mode

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

[0025] Please refer to Figures 1 to 5 , the present invention provides a technical solution: a radial grouting method for a tunnel, which is carried out according to the following steps: Step 1, determine the range of the grouting area on the inner side of the tunnel to be constructed and plan the grouting layer 2; Step 2, evenly arrange the grout stopping component 5 and the pressure detection component 4 along the grouting layer 2; Step 3, insert the grouting pipe 6 along each grout stopping component 5, and use a connecting structure to dock and fix the grouting pipe 6 with the grout stopping component 5; Step 4, connect the bottom of the grouting pipe 6 to a pressure pump and a conveying device to carry out the grouting process; Step 5, judge the flow condition of the cement mortar inside the grouting layer 2 according to the display state of the pressure detection component 4; Step 6, remove the grouting pipe 6, seal the grout stopping component 5, and let it stand for a period of time to make the internal cement mortar solidify, and then weld and seal the bottom of the grout stopping component 5. In the second step, the grout stopping component 5 and the pressure detection component 4 are distributed along the radial direction of the tunnel, and multiple pressure detection components 4 are installed between every two adjacent grout stopping components 5. In the sixth step, after the grouting is completed, only the grouting pipe 6 is pulled out, while the grout stopping component 5 and the pressure detection component 4 are always sealed in the grouting layer 2. Specifically, the cement mortar is injected into the inside of the grouting layer 2 along the grouting pipe 6 by an external power device. The cement mortar flows along the bottom inside the grouting layer 2 and passes through each pressure detection component 4 in turn. The filling state of the cement mortar in this area is judged through the observation hole 24 and the pressure gauge 26 at the bottom of the pressure detection component 4, and then the grouting pipe 6 is adjusted.

[0026] This embodiment also provides a grouting device used for a tunnel radial grouting method, including a grouting pipe 6, a grout stop component 5, and a pressure detection component 4. The grout stop component 5 and the pressure detection component 4 are both fixedly installed on the inner wall 1 of the tunnel. The grouting layer 2 is arranged at the top of the inner wall 1 of the tunnel. The outer wall 3 of the tunnel is arranged at the top of the grouting layer 2. The bottom end of the grout stop component 5 is provided with a grout stop pressing plate 11, and the grout stop component 5 is fixed at the inner wall 1 of the tunnel by using a bottom bolt 12 to pass through the grout stop pressing plate 11. The top end of the grouting pipe 6 penetrates upward from the middle position of the grout stop pressing plate 11 into the grout stop component 5. The bottom end of the pressure detection component 4 is provided with a fixing plate 25. The top of the fixing plate 25 is provided with a detection sleeve 19. An independent grout outlet pipe 28 is arranged inside the detection sleeve 19. By using the grout stop component 5 to fix the grouting pipe 6 and enabling it to rotate at a certain angle, the injection condition of the cement mortar at each position can be judged according to the uniformly arranged pressure detection component 4, so as to adjust the spraying angle of the grouting in real time, make the cement mortar flow more uniformly around, and improve the pressure uniformity of the cement mortar in the later stage.

[0027] In this embodiment, the grout stop component 5 includes a grout stop pressing plate 11 and a grout stop sleeve 13. The grout stop sleeve 13 is welded and installed at the top end of the grout stop pressing plate 11. A threaded sleeve 15 is arranged at the top end of the grout stop sleeve 13. A lead-out channel 14 is arranged on the surface of the grout stop sleeve 13. A baffle 18 is arranged on the inner wall of the grout stop sleeve 13. The grout stop component 5 is fixedly connected with the top of the grouting pipe 6 through the threaded sleeve 15. A fixing hole 16 is arranged at the top of the threaded sleeve 15. A top bolt 17 is inserted into the fixing hole 16. The top end of the threaded sleeve 15 is in partial contact with the outer wall 3 of the tunnel. The grout stop component 5 is fixedly installed on the outer wall 3 of the tunnel by using the top bolt 17. The grout stop component 5 supports the grouting pipe 6. At the same time, sealing structures are arranged between the grout stop component 5 and the inner wall 1 of the tunnel and between the grout stop component 5 and the grouting pipe 6, providing a comprehensive and efficient sealing function and reducing the seepage situation at the grouting pipe 6 during the grouting process. Specifically, during installation, first drill a hole at the inner wall 1 of the tunnel, and insert the grout stop sleeve 13 of the grout stop component 5 upward from the hole until the top threaded sleeve 15 abuts against the top of the grouting layer 2. Since the thickness of the grouting layer 2 is fixed, the bottom grout stop pressing plate 11 will simultaneously contact the bottom end of the inner wall 1 of the tunnel. At this time, use the bottom bolt 12 and the top bolt 17 to fix the grout stop pressing plate 11 and the threaded sleeve 15 respectively.

[0028] In this embodiment, a threaded post 7 is installed at the top of the grouting pipe 6. A slurry outlet 10 is formed on the surface of the grouting pipe 6. The grouting pipe 6 is screwed into the interior of a threaded sleeve 15 through the threaded post 7. There are two lead-out channels 14, and there is one slurry outlet 10. The diameter of the slurry outlet 10 is the same as the inner diameter of the lead-out channel 14. A top plate 8 is arranged on the surface of the grouting pipe 6. A sealing layer 9 is attached to the surface of the top plate 8. The top plate 8 is pressed against the bottom of a baffle 18 through the sealing layer 9, and the number of the baffle 18 and the top plate 8 is the same. The diameter of the top plate 8 gradually increases from top to bottom. Specifically, after the grouting pipe 6 is inserted into the interior of the grout-stop sleeve 13, the threaded sleeve 15 at the top of the grouting pipe 6 is screwed into the interior of the threaded sleeve 15, and through the screw connection, the grouting pipe 6 can be combined and fixed with the grout-stop assembly 5. At the same time, each bottom top plate 8 abuts against the top of the baffle 18. Through the connection of the top threaded structure, the sealing layer 9 between the top plate 8 and the baffle 18 can be extruded, and the sealing state between the grouting pipe 6 and the grout-stop sleeve 13 can be realized by using the sealing layer 9. During the subsequent grouting process, the rotation of the grouting pipe 6 is controlled according to the pressure detection component 4, so as to control the alignment of the slurry outlet 10 with different lead-out channels 14 and adjust the spraying angle of the cement mortar.

[0029] In this embodiment, a top slurry outlet 27 is arranged at the top of the detection sleeve 19. A positioning rod 20 is welded and installed on the side of the top slurry outlet 27. A support plate 21 is installed at the top of the positioning rod 20. Middle slurry outlets 22 and bottom slurry outlets 23 are formed on the side of the detection sleeve 19. The inner sides of the middle slurry outlets 22 and the bottom slurry outlets 23 are respectively communicated with independent slurry pipes 28. An observation hole 24 is arranged at the bottom end of the independent slurry pipe 28. A pressure gauge 26 is installed on the outer side of the bottom of the detection sleeve 19. The pressure detection component 4 is installed on the inner wall 1 of the tunnel through a screw passing through a fixing plate 25. By arranging slurry outlets at different heights at each pressure detection component 4, the injection depth of the cement mortar at different positions can be judged before the cement mortar is filled up. Therefore, the flow information of the internal cement mortar can be obtained in advance to facilitate adjustment and ensure that the cement mortar in each area of the grouting layer 2 can extend smoothly. When a certain amount of cement mortar is sprayed from the inside of the grouting pipe 6 into the grouting layer 2, it will spread to the bottom or the middle slurry outlet 22 of the corresponding pressure detection component 4 and can be directly observed from the observation hole 24 at the bottom along the independent slurry pipe 28. Based on this, the filling state of the grouting layer 2 at different positions can be visually judged until the pressure shown on the pressure gauge 26 reaches the preset standard, which means that the cement mortar in this area is completely filled and has sufficient effective pressure.

[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, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims in 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. Those 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 those skilled in the art.

Claims

1. A tunneling radial grouting device, characterized in that, It includes a grouting pipe (6), a grout stop assembly (5) and a pressure detection assembly (4). The grout stop assembly (5) and the pressure detection assembly (4) are both fixedly installed on the inner wall (1) of the tunnel. The grouting layer (2) is arranged on the top of the inner wall (1) of the tunnel. The outer wall (3) of the tunnel is arranged on the top of the grouting layer (2). The bottom end of the grout stop assembly (5) is provided with a grout stop pressing plate (11), and the grout stop assembly (5) is fixed at the inner wall (1) of the tunnel by passing a bottom bolt (12) through the grout stop pressing plate (11). The top end of the grouting pipe (6) penetrates upward into the grout stop assembly (5) from the middle position of the grout stop pressing plate (11). The bottom end of the pressure detection assembly (4) is provided with a fixing plate (25). A detection sleeve (19) is arranged on the top of the fixing plate (25). An independent slurry outlet pipe (28) is arranged inside the detection sleeve (19). The grout stop assembly (5) includes a grout stop pressing plate (11) and a grout stop sleeve (13). The grout stop sleeve (13) is welded and installed at the top end of the grout stop pressing plate (11). A threaded sleeve (15) is arranged at the top end of the grout stop sleeve (13). A threaded post (7) is installed at the top of the grouting pipe (6). A slurry outlet (10) is formed on the surface of the grouting pipe (6). The grouting pipe (6) is screwed into the threaded sleeve (15) through the threaded post (7). Two lead channels (14) are arranged inside each grout stop sleeve (13), and one slurry outlet (10) is arranged corresponding to each. The diameter of the slurry outlet (10) is the same as the inner diameter of the lead channel (14).

2. The radial grouting device for a tunnel according to claim 1, wherein: Lead channels (14) are formed on the surface of the grout stop sleeve (13). A baffle (18) is arranged on the inner wall of the grout stop sleeve (13). The threaded sleeve (15) is fixedly connected to the top of the grouting pipe (6).

3. The radial grouting device for a tunnel according to claim 1, characterized in that: A fixing hole (16) is formed at the top of the threaded sleeve (15). A top bolt (17) is inserted into the fixing hole (16). The top end of the threaded sleeve (15) is in partial contact with the outer wall (3) of the tunnel. The grout stop assembly (5) is fixedly installed on the outer wall (3) of the tunnel by using the top bolt (17).

4. A radial grouting device for a tunnel according to claim 1, characterized in that: A top plate (8) is arranged on the surface of the grouting pipe (6). A sealing layer (9) is pasted on the surface of the top plate (8). The top plate (8) is pressed against the bottom of the baffle (18) through the sealing layer (9), and the number of the baffle (18) and the top plate (8) is the same. The diameter of the top plate (8) gradually increases from top to bottom.

5. The radial grouting device for a tunnel according to claim 1, characterized in that: A top slurry outlet hole (27) is arranged at the top of the detection sleeve (19). A positioning rod (20) is welded and installed on the side of the top slurry outlet hole (27). A support plate (21) is installed at the top of the positioning rod (20). Middle slurry outlet holes (22) and bottom slurry outlet holes (23) are formed on the side of the detection sleeve (19).

6. The radial grouting device for a tunnel according to claim 5, characterized in that: The inner sides of the middle slurry outlet hole (22) and the bottom slurry outlet hole (23) are respectively and independently communicated with the independent slurry outlet pipe (28). An observation hole (24) is arranged at the bottom end of the independent slurry outlet pipe (28). A pressure gauge (26) is installed on the outer side of the bottom of the detection sleeve (19). The pressure detection assembly (4) is installed on the inner wall (1) of the tunnel by using screws to pass through the fixing plate (25).

7. A method for radial grouting of a tunnel, characterized in that When grouting is carried out by using the tunnel radial grouting device according to any one of claims 1-6, the following steps are included: Step 1: Determine the range of the grouting area inside the tunnel to be constructed and plan the grouting layer (2); Step 2: Uniformly arrange the grout stop assembly (5) and the pressure detection assembly (4) along the grouting layer (2); Step 3: Insert the grouting pipe (6) along each grout stop assembly (5), and use the connecting structure to dock and fix the grouting pipe (6) with the grout stop assembly (5); Step 4: Connect the bottom of the grouting pipe (6) to a pressure pump and a conveying device to carry out the grouting process; Step 5: Judge the flow condition of the cement mortar inside the grouting layer (2) according to the display state of the pressure detection assembly (4); Step 6: Remove the grouting pipe (6), seal the grout stop assembly (5), and after standing for a period of time to make the internal cement mortar solidify, weld and seal the bottom of the grout stop assembly (5).

8. A method for radial grouting in a tunnel according to claim 7, characterized in that: In the second step, the grout stop assembly (5) and the pressure detection assembly (4) are distributed along the radial direction of the tunnel, and a plurality of pressure detection assemblies (4) are installed between every two adjacent grout stop assemblies (5). In the sixth step, after grouting is completed, only the grouting pipe (6) is pulled out, while the grout stop assembly (5) and the pressure detection assembly (4) are always sealed in the grouting layer (2).

Images