Separated drainage system for gas tunnel

Abstract

The utility model discloses a separated drainage system for a gas tunnel, which solves the problem of unreasonable structural arrangement of a gas discharge system in the prior art, and has the beneficial effect of realizing the separation of a drainage system of a gas section and a drainage system of a non-gas section. Comprising first drainage devices and second drainage devices, the first drainage devices are arranged on a gas section of a tunnel, the second drainage devices are arranged on the two sides of the gas section of the tunnel, each of the first drainage devices and the second drainage devices comprises an annular drainage pipe located between a tunnel secondary lining and a rock mass, and the annular drainage pipes are permeable pipes; the first main drainage pipe of the first drainage device is located below the tunnel inverted arch, and the second main drainage pipe of the second drainage device is located above the tunnel inverted arch.

Description

Technical Field

[0001] The utility model relates to the field of tunnel engineering, in particular to a separated drainage system for a gas tunnel. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] With the acceleration of infrastructure construction in my country, the tunnel construction environment is becoming increasingly complex. In my country, coal and natural gas are widely distributed, and tunnels are increasingly used to pass through gas formations. According to regulations, gas tunnels need to separate gas from the surrounding rock seepage collected by the tunnel drainage system and then discharge it. At present, the gas tunnel drainage system mainly achieves water-gas separation through the following three methods:

[0004] Method 1: A water-gas separation device is installed on the longitudinal drainage pipe of the gas section side wall, and a longitudinal exhaust pipe is installed on the tunnel vault. The gas is separated by the separation device and discharged from the high-end hole through the vault exhaust pipe. The groundwater separated from the gas is collected into the central drainage pipe through the longitudinal drainage pipe of the side wall and then discharged from the low-end hole.

[0005] Method 2: Two central drainage pipes are set up in the tunnel. One is used to discharge groundwater and gas when passing through gas-containing strata. It is a water-gas mixed flow trench. A water-gas separation device is set up near the tunnel outlet to separate the gas outside the tunnel. The other is a drainage pipe that passes through non-gas areas and has no gas in it.

[0006] Method 3: The central drainage pipe is used as a water-gas mixing trench to discharge the groundwater from the gas section and the non-gas section together, and then the gas is separated outside the cave through the water-gas separation device installed at the cave entrance.

[0007] Among the above three methods, the inventor found that method 1 requires the laying of exhaust pipes along the tunnel on the arch. When the gas section is far away from the gas outlet (the higher side opening), the long-distance laying of the exhaust pipe is inconvenient for construction and is not conducive to the smooth discharge of gas. Methods 2 and 3 separate water and gas outside the tunnel after the groundwater is discharged, but method 2 requires the installation of two central drainage pipes within the range from the gas section to the opening on the groundwater discharge side. The central drainage pipe needs to be horizontally connected to the longitudinal pipes on both sides, which is prone to structural conflicts. Method 3 uses a central drainage pipe for the entire length, which has the risk of gas escaping from the pipe and freeing to the upstream non-gas section, especially for tunnels with higher gas concentrations. It is generally only suitable for tunnels with lower gas concentrations. Therefore, the existing gas tunnel drainage system has unreasonable structural settings, is not conducive to the discharge of gas, is prone to conflicts with the tunnel structure, and has poor versatility. Utility Model Content

[0008] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a separate drainage system for a gas tunnel, which can independently discharge groundwater in the gas section and effectively make up for the deficiencies in the prior art.

[0009] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0010] A gas tunnel separated drainage system comprises a first drainage device and a second drainage device, wherein the first drainage device is arranged in the gas section of the tunnel, and the second drainage device is arranged on both sides of the gas section of the tunnel, the first drainage device and the second drainage device both comprise an annular drainage pipe located between the secondary lining of the tunnel and the rock mass, the annular drainage pipe is a permeable pipe, the annular drainage pipe is connected with a main drainage pipe, the first main drainage pipe of the first drainage device is located below the tunnel invert, and the second main drainage pipe of the second drainage device is located above the tunnel invert.

[0011] The drainage system as described above is provided with a first drainage device and a second drainage device. The first drainage device is arranged in the gas section of the tunnel, so that the drainage device of the gas section is separated from the drainage device of the non-gas section, and no interference or conflict occurs, and the gas does not overflow. The annular drainage pipes in the first drainage device and the second drainage device collect water seepage and gas from the tunnel surrounding rock, and the water seepage and / or gas from the tunnel surrounding rock flow to the main drainage pipe. The first main drainage pipe is located below the tunnel invert arch, and the corresponding first drainage device will not pass through the secondary lining, which is conducive to the smooth discharge of gas and has a high degree of safety.

[0012] In the above-mentioned gas tunnel separation drainage system, the annular drainage pipe is laid along the top and both sides of the tunnel secondary lining to collect surrounding rock seepage and / or gas around the tunnel from behind the tunnel secondary lining.

[0013] In the separated drainage system of a gas tunnel as described above, the annular drainage pipe is connected with the longitudinal drainage pipe, the longitudinal drainage pipe is arranged along the longitudinal direction of the tunnel, the longitudinal drainage pipe is connected with the transverse drainage pipe, and the transverse drainage pipe is connected with the first main drainage pipe or the second main drainage pipe, so that the surrounding rock seepage and / or gas enters the annular drainage pipe, then flows into the longitudinal drainage pipe, and flows to the first main drainage pipe or the second main drainage pipe through the transverse drainage pipe.

[0014] In the above-mentioned gas tunnel separation drainage system, the longitudinal drainage pipe is laid along the corner of the tunnel secondary lining to collect surrounding rock seepage water and / or gas in the annular drainage pipe;

[0015] The longitudinal drainage pipes are located on both sides of the exterior of the tunnel secondary lining.

[0016] In the above-mentioned gas tunnel separation drainage system, the longitudinal drainage pipe adopts a first corrugated pipe;

[0017] The transverse drainage pipe adopts a second corrugated pipe.

[0018] In the above-mentioned gas tunnel separated drainage system, the first drainage device is provided with a plurality of annular drainage pipes and transverse drainage pipes, respectively, and the second drainage device is provided with a plurality of annular drainage pipes and transverse drainage pipes, respectively, and the longitudinal drainage pipes located on both sides of the tunnel lining collect the surrounding rock seepage water and / or gas collected by the plurality of annular drainage pipes;

[0019] The annular drainage pipe in the first drainage device is staggered with the transverse drainage pipe in the first drainage device.

[0020] In the above-mentioned gas tunnel separated drainage system, the longitudinal drainage pipes on both sides of the first drainage device are respectively connected to all the annular drainage pipes;

[0021] The longitudinal drainage pipes on both sides of the first drainage device are respectively connected to all the transverse drainage pipes.

[0022] In the above-mentioned gas tunnel separated drainage system, the transverse drainage pipe in the first drainage device is located outside the tunnel invert;

[0023] The transverse drainage pipe in the second drainage device passes through the secondary lining of the tunnel and the backfill of the invert arch, and is connected to the second main drainage pipe located at the backfill of the invert arch.

[0024] In the above-mentioned gas tunnel separated drainage system, the first main drainage pipe extends from the gas section of the tunnel to the tunnel entrance to ensure that the gas is smoothly discharged to the tunnel entrance;

[0025] The second main drainage pipe is located at the invert backfill above the first main drainage pipe, and the length of the second main drainage pipe is consistent with the length of the tunnel.

[0026] In the above-mentioned gas tunnel separated drainage system, the first main drainage pipe and the second main drainage pipe are both located in the middle section of the tunnel in the transverse direction;

[0027] The longitudinal slope of the first main drainage pipe and the second main drainage pipe is consistent with that of the tunnel;

[0028] The first main drainage pipe adopts an airtight pipeline to prevent gas from overflowing.

[0029] The beneficial effects of the above utility model are as follows:

[0030] 1) The drainage system proposed by the utility model is provided with a first drainage device and a second drainage device. The first drainage device is arranged in the gas section of the tunnel, so that the drainage device of the gas section is separated from the drainage device of the non-gas section, and no interference and conflict will occur, and the gas will not overflow. The annular drainage pipes in the first drainage device and the second drainage device collect the tunnel surrounding rock seepage and / or gas, and the tunnel surrounding rock seepage and / or gas flow to the main drainage pipe. The first main drainage pipe is located below the tunnel invert, which is conducive to the smooth discharge of gas and has a high degree of safety.

[0031] 2) The structures of the first drainage device and the second drainage device in the utility model are reasonably set up. The surrounding rock seepage and / or gas located in the gas section or the non-gas section are collected through the annular drainage pipe. The surrounding rock seepage and / or gas flows into the longitudinal drainage pipe through the annular drainage pipe, and flows to the first main drainage pipe or the second main drainage pipe through the transverse drainage pipe. The pipeline is reasonably set up to ensure the sufficient collection of the tunnel surrounding rock seepage or gas.

[0032] 3) In the utility model, the transverse drainage pipes in the first drainage device and the second drainage device are arranged differently, one is located outside the tunnel, and the other passes through the secondary lining of the tunnel and the backfill of the invert arch, and is connected to the corresponding main drainage pipes, so that the first drainage pipe is located below the tunnel invert arch, and the other is located inside the tunnel. The second main drainage pipe and the first main drainage pipe are arranged up and down, and the structural arrangement is reasonable, which is convenient for the discharge of water.

[0033] 4) The first drainage device in the present invention is located at the bottom side of the tunnel, that is, below the invert structure, which effectively prevents the possibility of gas entering the tunnel during operation; and the setting of the first drainage device effectively prevents the second transverse drainage pipe from passing through the fully enclosed secondary lining structure and the gas isolation layer, thereby better ensuring the sealing of the fully enclosed lining structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0035] Figure 1 It is a schematic diagram of a first drainage device in a gas tunnel separation drainage system according to one or more embodiments of the utility model.

[0036] Figure 2 It is a schematic diagram of a second drainage device in a gas tunnel separation drainage system according to one or more embodiments of the utility model.

[0037] Figure 3It is a side view of a gas tunnel separation drainage system arranged along the secondary lining of the tunnel according to one or more embodiments of the utility model.

[0038] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0039] Among them: a-secondary lining, b-inverted arch, c-inverted arch backfill, d-waterproof layer, e-water-gas separation tank;

[0040] 1-1, first annular drainage pipe; 1-2, first longitudinal drainage pipe; 1-3, first transverse drainage pipe; 1-4, first main drainage pipe;

[0041] 2-1, second annular drainage pipe; 2-2, second longitudinal drainage pipe; 2-3, second transverse drainage pipe; 2-4, second main drainage pipe; DETAILED DESCRIPTION

[0042] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations;

[0044] As introduced in the background technology, the prior art has the problem of unreasonable structure arrangement of gas discharge pipes. In order to solve the above technical problems, the utility model proposes a gas tunnel separation drainage system.

[0045] In a typical implementation of the present invention, reference is made to Figure 1 As shown, a gas tunnel separated drainage system includes a first drainage device and a second drainage device. The first drainage device is arranged in the gas section of the tunnel, and the second drainage device is arranged on both sides of the gas section of the tunnel (along the axial direction of the tunnel). The first drainage device and the second drainage device both include an annular drainage pipe located behind the secondary lining a of the tunnel. The annular drainage pipe is a soft permeable pipe, and the annular drainage pipe is connected to the main drainage pipe.

[0046] It needs to be explained that a waterproof layer d is provided on the outer surface of the secondary lining of the tunnel, and the annular drainage pipe is provided close to the waterproof layer d;

[0047] It can be understood that, regardless of the first drainage device or the second drainage device, the corresponding annular drainage pipe is laid along the top and both sides of the tunnel secondary lining, and the annular drainage pipe is arranged along the outer surface of the tunnel secondary lining a, with a covering angle greater than 180° and less than 300°, so as to collect surrounding rock seepage and / or gas around the tunnel from between the tunnel secondary lining and the inner wall of the tunnel.

[0048] In this embodiment, the first drainage device includes a first annular drainage pipe 1-1, which is connected to the first longitudinal drainage pipe 1-2, and the first longitudinal drainage pipe 1-2 is arranged along the longitudinal direction of the tunnel. The first longitudinal drainage pipe 1-2 is connected to the first transverse drainage pipe 1-3, and the first transverse drainage pipe 1-3 is connected to the first main drainage pipe 1-4, so that the surrounding rock seepage and gas enter the first annular drainage pipe 1-1, then flow into the first longitudinal drainage pipe 1-2, and flow to the first main drainage pipe 1-4 through the first transverse drainage pipe 1-3.

[0049] The second drainage device includes a second annular drainage pipe 2-1, which is connected to the second longitudinal drainage pipe 2-2. The second longitudinal drainage pipe 2-2 is arranged along the longitudinal direction of the tunnel. The second longitudinal drainage pipe 2-2 is connected to the second transverse drainage pipe 2-3, and the second transverse drainage pipe 2-3 is connected to the second main drainage pipe 2-4. In this way, water seepage from the surrounding rock enters the second annular drainage pipe 2-1, then flows into the second longitudinal drainage pipe 2-2, and flows to the second main drainage pipe through the second transverse drainage pipe.

[0050] Among them, the first longitudinal drainage pipe and the second longitudinal drainage pipe are both laid along the corner position of the tunnel secondary lining a, and the first longitudinal drainage pipe and the second longitudinal drainage pipe are located on both sides of the outside of the tunnel secondary lining a.

[0051] Understandably, reference Figure 2 As shown, the second transverse drainage pipe 2-2 in the second drainage device passes through the tunnel secondary lining a and the invert backfill c, and is connected to the second main drainage pipe located at the invert backfill c.

[0052] The first main drainage pipe 1-4 extends from the gas section of the tunnel to the tunnel entrance to ensure that the gas is discharged smoothly to the tunnel entrance. The first main drainage pipe 1-4 is discharged into the water-gas separation tank e at the tunnel entrance to separate the gas and then lead the groundwater out of the tunnel;

[0053] In this embodiment, the second main drainage pipe 2-4 is located at the invert backfill above the first main drainage pipe 1-4, the first main drainage pipe is located below the invert b, the second main drainage pipe is located above the invert b, the surrounding side of the second main drainage pipe is the invert backfill c, and the first transverse drainage pipe in the first drainage device is located outside the tunnel invert; the length of the second main drainage pipe is consistent with the length of the tunnel, and the second main drainage pipe directly leads the water in the non-gas section out of the cave.

[0054] The first main drainage pipe and the second main drainage pipe are both located in the middle section of the tunnel in the transverse direction. The cross-sections of the two are rectangular or circular. The longitudinal slope of the first main drainage pipe and the second main drainage pipe is consistent with the tunnel. The first main drainage pipe adopts an airtight pipeline, specifically, airtight concrete material can be used, and the structural joints are sealed with two-component polysulfide sealant or other sealing materials to prevent gas overflow.

[0055] Specifically, the first longitudinal drainage pipe and the second longitudinal drainage pipe adopt the first corrugated pipe; the first transverse drainage pipe and the second transverse drainage pipe adopt the second corrugated pipe, and the first corrugated pipe and the second corrugated pipe specifically adopt the existing high-density polyethylene corrugated pipe.

[0056] refer to Figure 3 As shown, a plurality of first annular drainage pipes 1-1 and first transverse drainage pipes 1-3 are respectively provided in the first drainage device, and a distance is set between two adjacent first annular drainage pipes; a plurality of second annular drainage pipes and second transverse drainage pipes are respectively provided in the second drainage device; the first longitudinal drainage pipes 1-2 located on both sides of the tunnel lining collect the surrounding rock seepage and gas collected by the plurality of first annular drainage pipes; the first longitudinal drainage pipes collect the surrounding rock seepage collected by the plurality of first annular drainage pipes;

[0057] It can be understood that the first annular drainage pipe 1-1 and the first transverse drainage pipe 1-3 in the first drainage device are staggered; the second annular drainage pipe 2-1 and the second transverse drainage pipe 2-3 in the second drainage device are staggered, and the first transverse drainage pipe and the second transverse drainage pipe are each arranged at 5 to 10 m along the longitudinal direction of the tunnel;

[0058] The first longitudinal drain pipes on both sides of the first drain device are respectively connected to all the first annular drain pipes; the first longitudinal drain pipes on both sides of the first drain device are respectively connected to all the first transverse drain pipes; similarly, the second longitudinal drain pipes on both sides of the second drain device are respectively connected to all the second annular drain pipes; the second longitudinal drain pipes on both sides of the second drain device are respectively connected to all the second transverse drain pipes;

[0059] It is also easy to understand that the drainage device at the gas section, that is, the first longitudinal drainage pipe in the first drainage device, is not connected to the second longitudinal drainage pipe of the second drainage device.

[0060] The drainage system provided in this embodiment is provided with a first drainage device and a second drainage device. The first drainage device is arranged in the gas section of the tunnel. In this way, the drainage device in the gas section is separated from the drainage device in the non-gas section, and no interference or conflict occurs, and gas does not overflow. The first drainage device and the

[0061] The annular drainage pipe in the second drainage device collects water seepage and gas from the tunnel surrounding rock. The water seepage or gas from the tunnel surrounding rock flows to the main drainage pipe. The first main drainage pipe is located below the tunnel invert arch, which is conducive to the smooth discharge of gas and has a high degree of safety.

[0062] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A gas tunnel separation drainage system, characterized in that: It includes a first drainage device and a second drainage device. The first drainage device is arranged in the gas section of the tunnel, and the second drainage device is arranged on both sides of the gas section of the tunnel. The first drainage device and the second drainage device both include an annular drainage pipe located between the secondary lining of the tunnel and the rock mass. The annular drainage pipe is a permeable pipe. The annular drainage pipe is connected to the main drainage pipe. The first main drainage pipe of the first drainage device is located below the tunnel invert, and the second main drainage pipe of the second drainage device is located above the tunnel invert.

2. A gas tunnel separation drainage system according to claim 1, characterized in that: The annular drainage pipe is laid along the top and both sides of the tunnel secondary lining.

3. A gas tunnel separation drainage system according to claim 1, characterized in that: The annular drainage pipe is connected to the longitudinal drainage pipe, the longitudinal drainage pipe is arranged along the longitudinal direction of the tunnel, the longitudinal drainage pipe is connected to the transverse drainage pipe, and the transverse drainage pipe is connected to the first main drainage pipe or the second main drainage pipe.

4. A gas tunnel separation drainage system according to claim 3, characterized in that: The longitudinal drainage pipe is laid along the corner of the tunnel secondary lining; The longitudinal drainage pipes are located on both sides of the exterior of the tunnel secondary lining.

5. A gas tunnel separation drainage system according to claim 3, characterized in that: The longitudinal drainage pipe adopts a first corrugated pipe; The transverse drainage pipe adopts a second corrugated pipe.

6. A gas tunnel separation drainage system according to claim 3, characterized in that: The first drainage device is provided with a plurality of annular drainage pipes and a plurality of transverse drainage pipes, respectively, and the second drainage device is provided with a plurality of annular drainage pipes and a plurality of transverse drainage pipes, respectively; The annular drainage pipe in the first drainage device is staggered with the transverse drainage pipe in the first drainage device.

7. A gas tunnel separation drainage system according to claim 6, characterized in that: The longitudinal drainage pipes on both sides of the first drainage device are respectively connected to all the annular drainage pipes; The longitudinal drainage pipes on both sides of the first drainage device are respectively connected to all the transverse drainage pipes.

8. A gas tunnel separation drainage system according to claim 3, characterized in that: The transverse drainage pipe in the first drainage device is located outside the invert; The transverse drainage pipe in the second drainage device passes through the secondary lining of the tunnel and the backfill of the invert arch, and is connected to the second main drainage pipe located at the backfill of the invert arch.

9. A gas tunnel separation drainage system according to claim 1, characterized in that: The first main drainage pipe extends from the gas section of the tunnel to the tunnel entrance; The second main drainage pipe is located at the invert backfill above the first main drainage pipe, and the length of the second main drainage pipe is consistent with the length of the tunnel.

10. A gas tunnel separation drainage system according to claim 1, characterized in that: The first main drainage pipe and the second main drainage pipe are both located in the middle section of the tunnel in the transverse direction; The longitudinal slope of the first main drainage pipe and the second main drainage pipe is consistent with that of the tunnel; The first main drainage pipe adopts an airtight pipeline.

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