Diffusion type pipeline system, grouting system and tunnel for tunnel arch crown grouting

Abstract

This utility model relates to the technical field of tunnel construction equipment, specifically to a diffused pipeline system, grouting system, and tunnel for grouting the tunnel arch. The diffused pipeline system includes a main pipeline and several branch pipelines. The main pipeline is buried in the arch area of ​​the secondary lining of the tunnel and extends along the tunnel axis. Several branch pipelines are arranged on both sides of the main pipeline and extend circumferentially to the edge of the arch of the secondary lining. Several overflow holes are opened on the sidewalls of the main pipeline and the branch pipelines, and the overflow holes are sealed with rubber plugs that can detach from the overflow holes under the pressure of the pipeline. The diffused pipeline system of this utility model covers the entire arch area. For any voids appearing at any location in the arch, cement grout can be injected into the correct location through the main pipeline and each branch pipeline. The multiple overflow holes on the main pipeline and each branch pipeline also ensure sufficient grouting range and grouting effect.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction equipment technology, and in particular to a diffused pipeline system, grouting system and tunnel for filling grout in the tunnel arch. Background Technology

[0002] During the pouring of secondary lining concrete in tunnels, the pouring sequence is from bottom to top. When pouring upwards to the tunnel arch area, the concrete will flow towards the sidewalls on both sides of the arch under the influence of gravity (the flow process is slow). This often results in voids and cavities in the secondary lining concrete of the arch area, which is commonly referred to in the industry as voids. To fill the voids and cavities in the arch area, it is necessary to inject grout into the arch concrete. The existing grouting method is to set up a grouting pipe at the arch and use grouting equipment to inject grout into the grouting pipe. The cement grout will enter the arch concrete through small holes on the grouting pipe to fill the voids. However, the location of voids in the arch concrete is often quite random and can occur in any possible location. A single grouting pipe cannot cover the entire arch area. For voids far from the grouting pipe, the injected cement grout is difficult to reach and fill, which will greatly affect the overall grouting effect of the arch. Utility Model Content

[0003] The purpose of this utility model is to overcome the technical problem that existing tunnel arch grouting pipes cannot cover the arch area, thus failing to grout distant voids and affecting the overall grouting effect of the arch. The present invention provides a diffused pipeline system, grouting system and tunnel for tunnel arch grouting.

[0004] In a first aspect, the present invention provides a diffused pipeline system for grouting the arch of a tunnel, comprising a main pipeline and several branch pipelines. The main pipeline is buried in the arch area of ​​the secondary lining of the tunnel and extends along the axial direction of the tunnel. Several branch pipelines are arranged on both sides of the main pipeline and extend circumferentially along the tunnel to the edge of the arch of the secondary lining. Several overflow holes are provided on the sidewalls of the main pipeline and the sidewalls of the branch pipelines. The overflow holes are sealed with rubber plugs, which can be released from the overflow holes when subjected to internal pressure in the pipeline.

[0005] This invention adds multiple branch pipelines on both sides of the main pipeline along the longitudinal direction of the tunnel, extending the branch pipelines to the edge of the arch area. This allows the pipeline system to cover the entire arch area. For any voids appearing in the arch, cement grout can be injected into the voids through the main pipeline and each branch pipeline. Multiple overflow holes are opened on the main pipeline and each branch pipeline to ensure sufficient grouting range and prevent the injected grout from concentrating in a local area and missing possible voids. Since the pipeline system needs to be pre-embedded before the secondary lining concrete is poured, to prevent concrete from entering the overflow holes during the secondary lining pouring and causing blockage, which would affect subsequent grouting, the overflow holes need to be sealed with rubber plugs in advance. When grouting is performed later, since the secondary lining concrete has not yet initially set, the grouting pressure in the pipeline can force the rubber plugs open and remove them from the overflow holes, reopening the overflow holes. This allows the grout in the pipeline to enter the voids in the secondary lining concrete through the overflow holes to fill them, ensuring the grouting effect.

[0006] Preferably, it also includes an exhaust pipe, which is embedded in the arch of the secondary lining and arranged parallel to the main pipeline. The inlet end of the exhaust pipe is embedded in the secondary lining, and the outlet end of the exhaust pipe extends to the end face of the secondary lining.

[0007] Preferably, the main pipeline, the branch pipeline, and the exhaust pipeline are all connected to the waterproof membrane by a fixing strap.

[0008] Preferably, the main pipeline and the branch pipeline are connected by a four-way connector.

[0009] Preferably, the input end of the main pipeline is provided with a ball valve.

[0010] Preferably, a plurality of the overflow holes are arranged at intervals along the length of the main pipeline or the length of the branch pipeline, or a plurality of the overflow holes are arranged in a staggered quincunx pattern on the pipe wall of the main pipeline or the pipe wall of the branch pipeline.

[0011] Preferably, the diameter of the overflow hole is 6mm to 8mm, and the distance between two adjacent overflow holes is 15cm to 20cm.

[0012] Preferably, both the main pipeline and the branch pipelines are made of PVC material.

[0013] In a second aspect, the present invention provides a grouting system for the voiding of the tunnel secondary lining arch, including grouting equipment and a diffusion pipeline system for grouting the tunnel arch as described above, wherein the grouting equipment is connected to the inlet end of the main pipeline.

[0014] In a third aspect, this utility model provides a tunnel, comprising an initial support, a waterproof slab, and a secondary lining arranged sequentially from the outside to the inside. The waterproof slab is provided with a diffused pipeline system for grouting the tunnel arch, as described above, and the pipeline system is embedded in the secondary lining.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention provides a diffused pipeline system, grouting system, and tunnel for grouting in tunnel arches. By adding multiple branch pipelines on both sides of the main pipeline along the longitudinal direction of the tunnel, and extending the branch pipelines to the edge of the arch area, the pipeline system can cover the entire arch area. For any voids appearing in the arch, cement grout can be injected into the voids through the main pipeline and each branch pipeline. Multiple overflow holes are opened on the main pipeline and each branch pipeline to ensure sufficient grouting range and avoid the injected grout from concentrating in a local area and missing possible voids. Since the pipeline system needs to be pre-embedded before the secondary lining concrete is poured, to prevent concrete from entering the overflow holes during the secondary lining pouring and causing blockage, which would affect subsequent grouting, the overflow holes need to be sealed with rubber plugs in advance. When grouting is performed later, since the secondary lining concrete has not yet initially set, the grouting pressure in the pipeline can force the rubber plugs open and remove them from the overflow holes, reopening the overflow holes. This allows the grout in the pipeline to enter the voids in the secondary lining concrete along the overflow holes to fill them, ensuring the grouting effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the planar structure of the diffused pipeline system of this utility model.

[0018] Figure 2 This is a longitudinal cross-sectional view of the tunnel of this utility model (ball valve not shown).

[0019] Figure 3 This is a schematic diagram showing the planar layout of the overflow holes after the pipe walls of the main pipeline and branch pipelines are unfolded.

[0020] Figure 4 for Figure 2 A magnified view of a section at point C (ball valve not shown).

[0021] Marked in the image:

[0022] 1. Main pipeline, 2. Branch pipeline, 3. Exhaust pipeline, 4. Overflow hole, 5. Fixing belt, 6. Four-way connector, 7. Ball valve, 8. Initial support, 9. Waterproof membrane, 10. Secondary lining. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0024] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0026] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0027] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0028] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0029] Example 1

[0030] This embodiment provides a diffused pipeline system for grouting in tunnel arches.

[0031] Figure 1 This is a schematic diagram of the planar structure of the diffused pipeline system of this utility model; Figure 2 This is a longitudinal cross-sectional view of the tunnel of this utility model; Figure 3 A schematic diagram showing the planar layout of overflow holes after the pipe walls of the main pipeline and branch pipelines are unfolded; Figure 4 for Figure 2 A magnified view of a section at point C (ball valve not shown).

[0032] like Figures 1 to 4 As shown in the figure, the diffused pipeline system for tunnel arch grouting in this embodiment includes a main pipeline 1 and multiple branch pipelines 2. The main pipeline 1 is buried in the arch area of ​​the secondary lining 10 of the tunnel and extends along the axial direction of the tunnel (i.e., the longitudinal direction of the tunnel). The multiple branch pipelines 2 are arranged on both sides of the main pipeline 1 and extend circumferentially to the edge of the arch of the secondary lining 10. Multiple overflow holes 4 are opened on the sidewalls of the main pipeline 1 and the sidewalls of the branch pipelines 2. The overflow holes 4 are sealed with rubber plugs (not shown in the figure). The rubber plugs can be released from the overflow holes 4 when subjected to internal pressure in the pipeline. Here, the length of the main pipeline 1 can be greater than the longitudinal length of the secondary lining 10 of the tunnel, so that the input end of the main pipeline 1 is exposed. For example, the length of the main pipeline 1 can be the length of the secondary lining 10 plus 200mm, that is, the length of the input end of the main pipeline 1 exposed outside the secondary lining 10 is 200mm. The exposed input end can be easily connected to the grouting equipment (not shown in the figure).

[0033] Specifically, the diameter of the main pipe 1 and the branch pipe 2 can be 32mm. Of course, other pipe diameters can also be selected for the main pipe 1 and the branch pipe 2. This utility model does not make specific limitations on this.

[0034] Figure 1 The direction indicated by the middle arrow A is the end formwork side of the secondary lining 10, and the direction indicated by the arrow B is the concrete side of the secondary lining 10.

[0035] This invention adds multiple branch pipes 2 on both sides of the main pipeline 1 along the longitudinal direction of the tunnel, extending the branch pipes 2 to the edge of the arch area. This allows the pipeline system to cover the entire arch area. For any voids appearing in the arch, cement grout can be injected into the voids through the main pipeline 1 and each branch pipe 2. Multiple overflow holes 4 are opened on the main pipeline 1 and each branch pipe 2 to ensure sufficient grouting range and prevent the injected grout from concentrating in a local area and missing possible voids. Since the pipeline system needs to be pre-embedded before the pouring of the secondary lining 10 concrete, to prevent the concrete from entering the overflow holes 4 during the pouring of the secondary lining 10 and causing blockage, which would affect subsequent grouting, the overflow holes 4 need to be sealed with rubber plugs in advance. When grouting is performed later, since the secondary lining 10 concrete has not yet initially set, the grouting pressure in the pipeline can force the rubber plugs open and remove them from the overflow holes 4, allowing the overflow holes 4 to reopen. This facilitates the grout in the pipeline to enter the voids in the secondary lining 10 concrete along the overflow holes 4 to fill them, ensuring the grouting effect.

[0036] Specifically, the distance between two adjacent branch pipes 2 on one side of the main pipe 1 can be 200mm. Of course, other distances can also be selected between two adjacent branch pipes 2 on one side of the main pipe 1. This utility model does not make specific limitations on this.

[0037] In this embodiment, the diffused piping system also includes an exhaust pipe 3, which is embedded in the arch of the secondary lining 10 and arranged parallel to the main pipeline 1. The inlet end of the exhaust pipe 3 is embedded in the secondary lining 10, and the outlet end of the exhaust pipe 3 extends to the end face of the secondary lining 10. The outlet end of the exhaust pipe 3 also needs to be connected to the outside of the secondary lining 10. For example, the outlet end of the exhaust pipe 3 can be flush with the end face of the secondary lining 10, or the outlet end of the exhaust pipe 3 can be exposed and extend to the secondary lining 10. Outside the end face of 0, the inlet end of the exhaust pipe 3 is embedded in the concrete of the secondary lining 10. To prevent concrete from entering the exhaust pipe 3 from the inlet end of the exhaust pipe 3 during the pouring of the secondary lining 10, it is necessary to temporarily seal the inlet end of the exhaust pipe 3 with tape (not shown in the figure). During subsequent grouting, if grout reaches the inlet end of the exhaust pipe 3, when the grout rises to a certain pressure, the tape temporarily sealing the inlet end of the exhaust pipe 3 can be pressed open, and the grout can enter the exhaust pipe.

[0038] It should be noted that the main pipeline 1 can be connected through multiple sections of secondary lining 10 in the longitudinal direction of the tunnel. In other words, one main pipeline 1 can connect multiple sections of secondary lining 10, while the exhaust pipe 3 is buried in each section of secondary lining 10. That is, one exhaust pipe 3 is buried in each section of secondary lining 10. There are gaps between adjacent sections of secondary lining 10. When the outlet end of the exhaust pipe 3 is located on the end face of the secondary lining 10, it can be connected to the outside to realize the function of exhaust.

[0039] In this embodiment, the main pipeline 1, branch pipeline 2, and exhaust pipeline 3 are all connected to the waterproof membrane 9 by fixing straps 5. Here, the fixing straps 5 can be fixing strips or fixing tapes, or pipe clamps, etc., to fix each pipeline to the waterproof membrane 9. Multiple fixing straps 5 can be arranged at intervals along the length of the pipeline. The spacing between two adjacent fixing straps 5 on each pipeline can be 40mm. Of course, other spacings can also be selected between two adjacent fixing straps 5 on each pipeline. This utility model does not make specific limitations on this.

[0040] In this embodiment, the main pipeline 1 and the branch pipeline 2 are connected by a four-way connector 6. As can be seen from the figure, the branch pipelines 1 on both sides of the main pipeline 1 are arranged opposite each other. That is to say, the connection positions of the branch pipelines 2 on both sides of the main pipeline 1 are corresponding. The four-way connector 6 can connect the main pipeline 1 with each branch pipeline 2 on both sides. Of course, the arrangement of the branch pipelines 2 on both sides of the main pipeline 1 can also be different. For example, they can be arranged in an alternating manner. The main pipeline 1 and the branch pipeline 2 can also be connected in one piece, which can be used as an alternative to the four-way connector 6. This utility model does not make specific limitations in this regard.

[0041] In this embodiment, a ball valve 7 is provided at the input end of the main pipeline 1. The input end of the main pipeline 1 can extend beyond the end face of the secondary lining 10 and is provided with a ball valve 7. The grouting equipment can be connected to the ball valve 7. During grouting, the ball valve 7 can be opened to connect the grouting equipment with the main pipeline 1. After grouting is completed, the ball valve 7 can be closed and the grouting equipment can be removed to prevent the injected grout from leaking from the input end of the main pipeline 1.

[0042] Optionally, multiple overflow holes 4 are spaced apart along the length of the main pipeline 1 or the branch pipeline 2, or multiple overflow holes 4 are arranged in a staggered, quincunx pattern on the pipe wall of the main pipeline 1 or the branch pipeline 2. The arrangement of the overflow holes 4 on the pipe walls of the main pipeline 1 and the branch pipeline 2 can adopt at least two methods: the first is that multiple overflow holes 4 are spaced apart along the length of the pipeline, and can be evenly spaced; the second is that multiple overflow holes 4 are arranged in a staggered, quincunx pattern, for example... Figure 3 The layout shown adopts Figure 3 The staggered plum blossom pattern shown can make the grouting more uniform in all directions and achieve a better grouting effect. Of course, this utility model is not limited to the above two patterns, and other patterns can also be used. This utility model does not make specific limitations on these patterns.

[0043] like Figure 3 As shown, Figure 3This diagram illustrates the layout of the overflow holes 4 after the pipe wall is unfolded into a plane. It can be understood as the arrangement of the overflow holes 4 when the pipe wall is unfolded into a plane, i.e., a planar layout diagram of the overflow holes 4. The diameter of the overflow holes 4 is 6mm~8mm, and the spacing between two adjacent overflow holes 4 is 15cm~20cm. Here, two adjacent overflow holes 4 refer to overflow holes 4 that are adjacent along the circumferential or longitudinal direction of the pipe, for example... Figure 3 The X direction marked in the diagram is the circumferential direction of the pipeline, and the Y direction is the longitudinal direction of the pipeline. The spacing L represents the distance between two adjacent overflow holes 4 in the circumferential direction of the pipeline or the distance between two adjacent overflow holes 4 in the longitudinal direction of the pipeline. The range of L can be selected from 15cm to 20cm.

[0044] Optionally, both the main pipe 1 and the branch pipe 2 can be made of PVC material; of course, other types of materials, such as RPC material, can also be used for the main pipe 1 and the branch pipe 2, and this utility model does not make specific limitations in this regard.

[0045] The following is a detailed description of the grouting process of the dispersion-type pipeline system of this utility model:

[0046] First, connect the grouting equipment to the input end of the main pipeline 1, open the ball valve 7, and start the grouting equipment to pressurize and grout into the main pipeline 1. The grout first enters the main pipeline 1 through the ball valve 7. Part of the grout overflows along the overflow hole 4 on the main pipeline 1 and fills the voids in the secondary lining 10 concrete near the main pipeline 1. Part of the grout enters each branch pipeline 2 through the four-way connector 6, and then overflows along the overflow hole 4 on each branch pipeline 2 and fills the voids in the secondary lining 10 concrete near each branch pipeline 2. As the grouting progresses... The process continues, with the pressure of the injected grout gradually increasing. If the grout reaches the inlet end of the vent pipe and exceeds a certain pressure, the sealing tape at the inlet end of the vent pipe can be pressed open to open the vent pipe and allow the grout to enter. When grout overflows evenly from the outlet end of the vent pipe, it indicates that the grouting is in place and can be stopped and completed. If the injected grout cannot reach the vent pipe, the grouting pressure value can be monitored through the grouting equipment. When the grouting pressure exceeds a certain preset pressure, such as exceeding 0.2 MPa, it also indicates that the grouting is in place and can be stopped and completed.

[0047] Example 2

[0048] This embodiment provides a grouting system for addressing the voiding of the arch of a tunnel secondary lining.

[0049] The grouting system for the tunnel secondary lining arch void in this embodiment includes a grouting device (not shown in the figure) and a diffused pipeline system for grouting the tunnel arch as described in Embodiment 1. The grouting device is connected to the inlet end of the main pipeline 1. Specifically, the grouting device can be connected to a ball valve 7. When grouting begins, the ball valve 7 can be opened and the grouting device can be started for grouting. After grouting is completed, the grouting device can be closed, the ball valve 7 can be closed, and the grouting device can be removed to complete the grouting.

[0050] Example 3

[0051] This embodiment provides a tunnel.

[0052] The tunnel in this embodiment includes an initial support 8, a waterproof membrane 9, and a secondary lining 10 arranged sequentially from the outside to the inside. The waterproof membrane 9 is provided with a diffused pipeline system for filling the tunnel arch with grout, and the pipeline system is buried in the secondary lining 10.

[0053] The construction sequence of the tunnel is as follows: First, the initial support 8 is constructed. After the initial support 8 is completed, a waterproof membrane 9 is laid on the inner side of the initial support 8. Then, a diffused pipeline system is installed on the waterproof membrane 9. The overflow hole 4 is temporarily sealed with a rubber plug. The inlet end of the exhaust pipe is temporarily sealed with tape. Then, the secondary lining 10 is poured. Finally, grouting equipment is used to inject grout into the secondary lining 10 through the diffused pipeline system.

[0054] In summary, this utility model provides a diffused pipeline system, grouting system, and tunnel for grouting in tunnel arches. By adding multiple branch pipelines on both sides of the main pipeline along the tunnel's longitudinal direction and extending these branch pipelines to the edge of the arch area, the pipeline system can cover the entire arch area. For any voids appearing in the arch, cement grout can be injected into the voids through the main pipeline and each branch pipeline. Multiple overflow holes are opened on the main pipeline and each branch pipeline to ensure sufficient grouting range and prevent the injected grout from concentrating in a localized area and missing potential voids. Since the pipeline system needs to be pre-embedded before the secondary lining concrete is poured, to prevent concrete from entering the overflow holes during secondary lining pouring and causing blockage, affecting subsequent grouting, the overflow holes need to be sealed with rubber plugs beforehand. During subsequent grouting, since the secondary lining concrete has not yet initially set, the grouting pressure in the pipeline can force the rubber plugs open, causing them to fall out of the overflow holes and reopening them. This allows the grout in the pipeline to enter the voids in the secondary lining concrete along the overflow holes and fill them, ensuring the grouting effect.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A diffusion-type pipeline system for grouting in tunnel arches, characterized in that, It includes a main pipeline (1) and several branch pipelines (2). The main pipeline (1) is buried in the arch area of ​​the secondary lining (10) of the tunnel and extends along the axial direction of the tunnel. Several branch pipelines (2) are arranged on both sides of the main pipeline (1) and extend circumferentially along the tunnel to the edge of the arch of the secondary lining (10). Several overflow holes (4) are opened on the sidewalls of the main pipeline (1) and the sidewalls of the branch pipelines (2). The overflow holes (4) are sealed with rubber plugs. The rubber plugs can be removed from the overflow holes (4) when subjected to internal pressure in the pipeline.

2. The diffusion-type pipeline system for grouting tunnel arches according to claim 1, characterized in that, It also includes an exhaust pipe (3), which is buried in the arch of the secondary lining (10) and is arranged parallel to the main pipeline (1). The inlet end of the exhaust pipe (3) is buried in the secondary lining (10), and the outlet end of the exhaust pipe (3) extends to the end face of the secondary lining (10).

3. The diffused pipeline system for grouting tunnel arches according to claim 2, characterized in that, The main pipeline (1), the branch pipeline (2) and the exhaust pipeline (3) are all connected to the waterproof membrane (9) by a fixing strap (5).

4. The diffusion-type pipeline system for grouting tunnel arches according to claim 1, characterized in that, The main pipeline (1) and the branch pipeline (2) are connected by a four-way connector (6).

5. The diffused pipeline system for grouting tunnel arches according to claim 1, characterized in that, The main pipeline (1) is equipped with a ball valve (7) at its input end.

6. The diffused pipeline system for grouting tunnel arches according to claim 1, characterized in that, Several overflow holes (4) are arranged at intervals along the length of the main pipeline (1) or the length of the branch pipeline (2); Alternatively, several of the overflow holes (4) are arranged in a staggered, quincunx pattern on the wall of the main pipeline (1) or the branch pipeline (2).

7. The diffused pipeline system for grouting tunnel arches according to claim 6, characterized in that, The diameter of the overflow hole (4) is 6mm~8mm, and the distance between two adjacent overflow holes (4) is 15cm~20cm.

8. The diffused pipeline system for grouting tunnel arches according to any one of claims 1 to 7, characterized in that, Both the main pipeline (1) and the branch pipeline (2) are made of PVC material.

9. A grouting system for addressing the voiding of the tunnel secondary lining arch, characterized in that, It includes grouting equipment and a diffused pipeline system for grouting tunnel arches as described in any one of claims 1 to 7, wherein the grouting equipment is connected to the inlet end of the main pipeline (1).

10. A tunnel, characterized in that, It includes an initial support (8), a waterproof membrane (9) and a secondary lining (10) arranged sequentially from the outside to the inside. The waterproof membrane (9) is provided with a diffused pipeline system for grouting the tunnel arch as described in any one of claims 1 to 7. The pipeline system is buried in the secondary lining (10).

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