Water vapor discharge structure suitable for auxiliary tunnel of gas tunnel and construction method

Abstract

The invention relates to the field of gas tunnel engineering, in particular to a steam discharge structure suitable for an auxiliary tunnel of a gas tunnel and a construction method. A water-gas discharging structure suitable for an auxiliary tunnel of a gas tunnel comprises a blind pipe, concrete, a backfilling section, a blocking section and a water-gas separating chamber, wherein the blind pipe and the concrete are arranged in a gas pumping and discharging drill site, and the backfilling section, the blocking section and the water-gas separating chamber are arranged in the auxiliary tunnel. The blind pipe is arranged on the hole wall of the gas drainage drill site, and the concrete is used for filling the gas drainage drill site; the backfill section is connected with the gas pumping and draining drill site and is provided with a connecting pipe, the connecting pipe is communicated with the blind pipe, and the backfill section is filled with backfill materials; the plugging section is positioned between the backfilling section and the water-gas separation chamber and is filled with concrete; and the water-gas separation chamber is used for separating gas in the water and gas and discharging the separated gas out of the hole of the auxiliary underground tunnel. By means of plugging and drainage, a gas pumping and drainage drill site and an auxiliary tunnel can be effectively disposed, and potential safety hazards in the tunnel construction and operation period are reduced.

Description

Technical Field

[0001] The invention relates to the field of gas tunnel engineering, and in particular to a water vapor discharge structure and a construction method suitable for an auxiliary tunnel of a gas tunnel. Background Art

[0002] As my country's railway and highway construction is in full swing, the construction of gas tunnels is also increasing. The construction of gas tunnels not only involves multiple complex factors such as geology and environment, but also comes with high risks. Therefore, ensuring safety and quality during construction and operation has become a top priority.

[0003] During the construction of long and large gas tunnels, it is often necessary to use gas extraction drilling sites and auxiliary tunnels for gas control. The gas extraction drilling site actively extracts gas from the rock layer and surrounding rock in front of the tunnel face by arranging boreholes to reduce gas concentration to prevent explosions or sudden accidents. The auxiliary tunnel is a channel used to connect the gas extraction drilling site with the outside world.

[0004] However, after the completion of the tunnel construction, how to seal the gas extraction drilling site and auxiliary tunnels and eliminate safety hazards is a major engineering problem. First, the unsealed gas extraction drilling site and auxiliary tunnels are prone to become dangerous areas where gas gathers, which not only increases the risk of gas diffusion, but also easily forms gas accumulation, increasing the gas pressure behind the wall of the main tunnel, thereby increasing the safety risks during construction and operation; second, during the tunnel construction process, if the gas is not effectively sealed and controlled, the gas may spread along the unsealed gas extraction drilling site and auxiliary tunnels, affecting other operating areas, causing a wider range of safety threats, and may even cause secondary disasters.

[0005] However, the existing technology currently lacks a solution for effectively handling the gas extraction drilling site and auxiliary tunnels of the gas tunnel, resulting in major safety hazards during tunnel construction and operation. Summary of the invention

[0006] The purpose of the present invention is to overcome the lack of effective disposal solutions for gas extraction drilling sites and auxiliary tunnels of gas tunnels in the prior art, which leads to great safety hazards during tunnel construction and operation, and to provide a water vapor discharge structure and construction method suitable for auxiliary tunnels of gas tunnels.

[0007] In a first aspect, the present invention provides a water vapor discharge structure suitable for an auxiliary tunnel of a gas tunnel, comprising: A blind pipe and concrete arranged in a gas extraction drilling site, wherein the blind pipe is arranged on a hole wall of the gas extraction drilling site, holes are arranged on the wall of the blind pipe, and the concrete is used to fill the gas extraction drilling site; The backfill section, the plugging section and the water-gas separation chamber are arranged in the auxiliary tunnel; The backfill section is connected to the gas drainage drill site. A connecting pipe is provided in the backfill section. The connecting pipe is communicated with the blind pipe. The backfill section is filled with backfill materials. The plugging section is located between the backfill section and the water-gas separation chamber. The plugging section is filled with concrete. The water-gas separation chamber includes an inlet pipe. The inlet pipe passes through the plugging section and is communicated with the connecting pipe. The water-gas separation chamber is used to separate the gas in the water-gas and discharge the separated gas outside the hole of the auxiliary tunnel.

[0008] The present invention provides a water-gas discharge structure applicable to the auxiliary tunnel of a gas tunnel. The concrete filled in the gas drainage drill site is used to plug the gas drainage drill site and reduce the overflow of gas. The water-gas in the gas drainage drill site can enter the blind pipe through the holes on the wall of the blind pipe. Then, the blind pipe can be used to collect the small amount of overflowed water-gas mixture in the gas drainage drill site. The water-gas mixture contains groundwater and gas. The backfill materials filled in the backfill section are used to occupy the space of the backfill section, avoid forming an accumulation space for gas, and reduce the risk of gas accumulation. The connecting pipe is used to connect the blind pipe and lead out the water-gas in the blind pipe. The concrete filled in the plugging section is used to plug the plugging section and avoid the diffusion of gas through the auxiliary tunnel after the gas overflows from the gas drainage drill site. The inlet pipe of the water-gas separation chamber communicates the connecting pipe with the water-gas separation chamber, so that the water-gas can enter the water-gas separation chamber. The water-gas separation chamber is used to separate the gas in the water-gas and discharge the separated gas outside the hole of the auxiliary tunnel, avoiding the accumulation of the gas in the water-gas in the auxiliary tunnel. Through the method of plugging and drainage, the present invention can discharge the gas in the gas drainage drill site of the gas tunnel outside the hole of the auxiliary tunnel, avoid the accumulation, pressure buildup and random diffusion of gas, effectively dispose of the gas drainage drill site and the auxiliary tunnel of the gas tunnel, and reduce the potential safety hazards during the tunnel construction and operation.

[0009] The blind pipe can be arranged along the length direction of the gas drainage drill site or along the circumferential direction of the gas drainage drill site.

[0010] The backfill materials can be crushed stones, sandy soil, slag or hard rock ballast.

[0011] The gas refers to the mixed gas containing gas.

[0012] Preferably, the blind pipe includes a circumferential pipe and a longitudinal pipe. The circumferential pipe is arranged circumferentially along the wall of the gas drainage drill site, and one circumferential pipe is provided every 1 m - 3 m along the length direction of the gas drainage drill site. Adjacent circumferential pipes are connected through the longitudinal pipe, and the longitudinal pipe is arranged on the floor of the gas drainage drill site.

[0013] The longitudinal pipe is arranged on the floor of the gas drainage drill site, which is beneficial to collecting the water and gas in the circumferential pipe into the longitudinal pipe. Through this arrangement, the water and gas in the gas drainage drill site can be better collected.

[0014] The materials that can be selected for the circumferential pipe and the longitudinal pipe include PVC pipes, steel pipes, corrugated steel, etc.

[0015] Preferably, both the circumferential pipe and the longitudinal pipe are double-wall perforated corrugated pipes, and geotextiles are wrapped on the outer sides of the circumferential pipe and the longitudinal pipe. The geotextiles are used to prevent impurities from blocking the holes in the double-wall perforated corrugated pipes, so that water and gas can smoothly enter the circumferential pipe and the longitudinal pipe. Compared with PVC pipes and steel pipes, the double-wall perforated corrugated pipes have a larger surface area under the same diameter, enabling more water and gas to enter the circumferential pipe and the longitudinal pipe.

[0016] Preferably, partition plates are provided on the outer sides of the circumferential pipe and the longitudinal pipe. The partition plates are used to prevent the concrete filled in the gas drainage drill site from compacting the geotextiles on the surfaces of the circumferential pipe and the longitudinal pipe, thereby blocking the holes on the circumferential pipe and the longitudinal pipe.

[0017] Preferably, the water-gas separation chamber further includes a water-gas chamber, a water chamber, an exhaust pipe, and a drain pipe. The inlet pipe is communicated with the water-gas chamber, the exhaust pipe is communicated at the top of the water-gas chamber, a communicating pipe is provided between the water-gas chamber and the water chamber, the drain pipe is communicated with the water chamber, and the connection position of the drain pipe is higher than that of the communicating pipe.

[0018] The inlet pipe is used to guide the collected water and gas into the water-gas chamber, and the water-gas chamber is used to accommodate water and gas. In the water-gas chamber, since the density of the groundwater in the water and gas is greater than that of the gas in the water and gas, the groundwater will deposit at the bottom of the water-gas chamber, while the gas will gather at the top of the water-gas chamber. The groundwater can enter the water chamber through the communicating pipe and then be discharged outside the water chamber through the drain pipe. The gas is discharged outside the entrance of the auxiliary tunnel through the exhaust pipe. The connection position of the drain pipe is higher than that of the communicating pipe, which can prevent the liquid level of the water chamber from being lower than the communicating pipe, thereby avoiding the gas in the water-gas chamber from entering the water chamber.

[0019] Preferably, the backfill is hard rock ballast.

[0020] Preferably, the length of the backfill section is 20m - 30m, and the length of the plugging section is 8m - 15m.

[0021] Preferably, both the connecting pipe and the inlet pipe are PVC pipes.

[0022] Preferably, a number of water stop rings are provided on the outer wall of the part of the inlet pipe passing through the plugging section. The water stop rings can increase the tightness of the plugging section and prevent gas from escaping between the concrete filled in the plugging section and the outer wall of the inlet pipe.

[0023] In a second aspect, the present invention provides a construction method for a water and gas discharge structure applicable to an auxiliary adit of a gas tunnel, which is applied to the water and gas discharge structure applicable to an auxiliary adit of a gas tunnel, and includes the following steps: S1: After wrapping the circumferential pipe and the longitudinal pipe with geotextile, arrange them in the gas drainage drill site. Install partition plates on the outer sides of the circumferential pipe and the longitudinal pipe. Reserve a first grouting pipe at the top of the gas drainage drill site. Fill the gas drainage drill site with concrete to the top, and inject cement slurry into the first grouting pipe to plug the filling gap at the top of the gas drainage drill site; S2: Install a connecting pipe in the backfill section, divide the backfill of the backfill section into a first backfill layer and a second backfill layer. The first backfill layer is mechanically backfilled, and the second backfill layer is manually backfilled with bags; S3: Install an inlet pipe in the plugging section, reserve a second grouting pipe at the top of the plugging section. Fill the plugging section with concrete to the top, and inject cement slurry into the second grouting pipe to plug the filling gap at the top of the plugging section; S4: Install the gas chamber, water chamber, exhaust pipe and drain pipe of the water and gas separation chamber, and connect the inlet pipe to the gas chamber to complete the construction.

[0024] The present invention provides a construction method for a water and gas discharge structure applicable to an auxiliary adit of a gas tunnel. With the help of the first grouting pipe and the second grouting pipe, the filling density of the concrete in the gas drainage drill site and the plugging section can be respectively improved, and the plugging effect can be enhanced. In the backfill section, the second backfill layer is manually backfilled with bags, which can solve the problem that mechanical backfilling cannot make the top dense, can increase the backfill density, and improve the backfill effect. Through this method, the construction of the water and gas discharge structure of the auxiliary adit of the gas tunnel can be completed quickly, and then the gas in the gas drainage drill site can be discharged outside the adit of the auxiliary tunnel, preventing the accumulation, pressure buildup and random diffusion of gas, enabling the effective treatment of the auxiliary adit and the gas drainage drill site of the gas tunnel, and reducing the potential safety hazards during tunnel construction and operation.

[0025] Advantages of the present invention compared with the prior art: The present invention provides a water and gas discharge structure applicable to an auxiliary adit of a gas tunnel. By means of plugging and drainage, the gas in the gas drainage drill site can be discharged to the outside of the adit, avoiding the accumulation, pressure buildup and random diffusion of gas, enabling the effective treatment of the gas drainage drill site and the auxiliary adit of the gas tunnel, and reducing the potential safety hazards during tunnel construction and operation; The present invention provides a construction method for a water and gas discharge structure applicable to an auxiliary adit of a gas tunnel. By this method, the construction of the water and gas discharge structure of the auxiliary adit of the gas tunnel can be completed quickly, and then the gas in the gas drainage drill site can be discharged to the outside of the adit, preventing the accumulation, pressure buildup and random diffusion of gas, enabling the effective treatment of the gas drainage drill site and the auxiliary adit of the gas tunnel, and reducing the potential safety hazards during tunnel construction and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a plan view of a water and gas discharge structure applicable to an auxiliary adit of a gas tunnel.

[0027] Figure 2 is Figure 1 a sectional view of the A-A section in

[0028] Figure 3 is Figure 1 a sectional view of the B-B section in

[0029] Figure 4 is Figure 1 a sectional view of the C-C section in

[0030] Figure 5 It is a plan view of the water and gas separation chamber.

[0031] Figure 6 It is an elevation view of the water and gas separation chamber.

[0032] Markings in the figure: 1 - Gas drainage drill site, 101 - Circumferential pipe, 102 - Longitudinal pipe, 103 - First grouting pipe, 2 - Backfill section, 201 - Connecting pipe, 202 - First backfill layer, 203 - Second backfill layer, 3 - Plugging section, 301 - Second grouting pipe, 4 - Water and gas separation chamber, 401 - Water - gas chamber, 402 - Water chamber, 403 - Inlet pipe, 404 - Exhaust pipe, 405 - Drain pipe. Detailed implementation manners

[0033] The present invention will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above - mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0034] In the description of the specific embodiments of the present invention, without special explanation, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the invention product / device / equipment is usually used. These orientation or positional relationship terms are only for facilitating the description of the present invention solution or simplifying the description in specific embodiments, facilitating technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present invention.

[0035] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel", "coaxial", etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel or coaxial, but can be slightly inclined or have a deviation, as long as the normal functions of the relevant components are not affected. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined; "coaxial" means that two components are arranged as coaxial as possible, and when the relative position changes, they move in a coaxial or approximately coaxial manner. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", "coaxial", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2 - 1 mm, preferably within 0.2 - 0.5 mm. As long as the corresponding device / component / element is within the error / deviation range, it can still play its role in the solution of the present invention.

[0036] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be construed as emphasizing or implying the relative importance of specific components.

[0037] In addition, in the description of the embodiments of the present invention, "several", "multiple", and "a number of" represent at least two. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a situation exceeding 9.

[0038] In addition, in the description of the technical solutions of the present invention, unless otherwise clearly specified / defined / restricted, where terms such as "set", "installed", "connected", "connected", "provided with", "laid", and "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be common connection means in the art such as welding, riveting, bolting, and threaded connection. Such a connection can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components.

[0039] Embodiment 1 As Figures 1 to 6 shown, a water and gas discharge structure suitable for an auxiliary tunnel in a gas tunnel includes a blind pipe and concrete provided in a gas drainage drill site 1, a backfill section 2, a plugging section 3, and a water and gas separation chamber 4 provided in the auxiliary tunnel.

[0040] The blind pipe is provided on the wall of the gas drainage drill site 1. The wall of the blind pipe is provided with holes. The concrete is used to fill the gas drainage drill site 1. Specifically, the concrete is C20 concrete. The blind pipe is fixed to the wall of the gas drainage drill site 1 through steel bars or brackets.

[0041] The backfill section 2 is connected to the gas drainage drill site 1. A connecting pipe 201 is provided in the backfill section 2. The connecting pipe 201 is communicated with the blind pipe. The backfill section 2 is filled with backfill.

[0042] The plugging section 3 is located between the backfill section 2 and the water and gas separation chamber 4. The plugging section 3 is filled with concrete. Specifically, the concrete is C20 concrete.

[0043] The water and gas separation chamber 4 includes an inlet pipe 403. The inlet pipe 403 passes through the plugging section 3 and is communicated with the connecting pipe 201. The water and gas separation chamber 4 is used to separate the gas in the water and gas and discharge the separated gas out of the opening of the auxiliary tunnel.

[0044] In an alternative embodiment, the blind pipe may include a circumferential pipe 101 and a longitudinal pipe 102. The circumferential pipe 101 is arranged circumferentially along the wall of the gas drainage drill site 1, and a circumferential pipe 101 is provided every 1 m - 3 m along the length direction of the gas drainage drill site 1. The specific interval may be 1 m, 1.5 m, 2 m, 2.5 m, or 3 m. Adjacent circumferential pipes 101 are connected by longitudinal pipes 102, and the longitudinal pipes 102 are arranged on the floor of the gas drainage drill site 1. Specifically, the longitudinal pipes 102 are arranged on the left and right sides of the floor of the gas drainage drill site 1. The longitudinal pipes 102 and the circumferential pipes 101 are connected by three-way pipes. The connecting pipe 201 is communicated with the longitudinal pipe 102.

[0045] In an alternative embodiment, both the circumferential pipe 101 and the longitudinal pipe 102 may be double-wall perforated corrugated pipes, and geotextiles are wrapped around the outer sides of the circumferential pipe 101 and the longitudinal pipe 102. The diameter of the double-wall perforated corrugated pipe is 200 mm or 300 mm, and the wall thickness is 2 mm - 6 mm. The specific wall thickness may be 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm. The holes on the double-wall perforated corrugated pipe are round holes with a diameter of 5 mm - 10 mm. The specific diameter may be 5 mm, 6 mm, 8 mm, or 10 mm. The specification of the geotextile is 150 g - 400 g per square meter. The specific specification may be 150 g, 200 g, 250 g, 300 g, 350 g, or 400 g per square meter.

[0046] In an alternative embodiment, partition plates may be provided on the outer sides of both the circumferential pipe 101 and the longitudinal pipe 102. The partition plates may be wooden boards or waterproof boards. It should be noted that partition plates are not provided at the positions where the circumferential pipe 101 contacts the wall of the gas drainage drill site 1 and where the longitudinal pipe 102 contacts the wall of the gas drainage drill site 1.

[0047] In an alternative embodiment, the water-gas separation chamber 4 may further include a water-gas chamber 401, a water chamber 402, an exhaust pipe 404, and a drain pipe 405. The inlet pipe 403 is communicated with the water-gas chamber 401, the exhaust pipe 404 is communicated at the top of the water-gas chamber 401, a connecting pipe is provided between the water-gas chamber 401 and the water chamber 402, the drain pipe 405 is communicated with the water chamber 402, and the connection position of the drain pipe 405 is higher than the connecting pipe.

[0048] Specifically, the water-gas separation chamber 4 is arranged in a pit formed on the bottom plate of the auxiliary adit. The pit is located between the sealing section 3 and the entrance of the auxiliary adit. Specifically, the distance between the pit and the sealing section 3 can be 2 m - 3 m. The inlet pipe 403 is laid along the bottom plate of the auxiliary adit and connected to the water-gas chamber 401. After the exhaust pipe 404 is led out from the water-gas chamber 401, it is laid along the top, side wall or bottom of the auxiliary adit and extends all the way to the outside of the entrance of the auxiliary adit. After the drain pipe 405 is led out from the water chamber 402, it can extend to the outside of the entrance of the auxiliary adit to directly discharge the groundwater in the water chamber 402 from the auxiliary adit; or it can be directly connected to the drainage ditch of the auxiliary adit to first discharge the groundwater in the water chamber 402 into the drainage ditch, and then the groundwater flows along the drainage ditch to the outside of the entrance of the auxiliary adit.

[0049] In an alternative embodiment, the length of the backfill section 2 can be 20 m - 30 m, and the specific lengths can be 20 m, 22 m, 25 m, 28 m, 30 m. The length of the sealing section 3 can be 8 m - 15 m, and the specific lengths can be 8 m, 10 m, 12 m, 15 m.

[0050] In an alternative embodiment, both the connecting pipe 201 and the inlet pipe 403 can be PVC pipes. The diameters of the connecting pipe 201 and the inlet pipe 403 can both be 150 mm - 300 mm, and the specific diameters can be 150 mm, 180 mm, 200 mm, 220 mm, 250 mm, 280 mm, 300 mm.

[0051] In an alternative embodiment, a number of water stop rings can be provided on the outer wall of the part of the inlet pipe 403 passing through the sealing section 3. Specifically, one water stop ring can be provided at an interval of 1 m along the length direction of the inlet pipe 403.

[0052] Embodiment 2 This embodiment describes the construction method of a water-gas discharge structure applicable to the auxiliary adit of a gas tunnel in Embodiment 1, including the following steps: S1: After wrapping the circumferential pipe 101 and the longitudinal pipe 102 with geotextile, they are arranged in the gas drainage drill site 1. A partition plate is installed outside the circumferential pipe 101 and the longitudinal pipe 102. A first grouting pipe 103 is reserved at the top of the gas drainage drill site 1. The gas drainage drill site 1 is filled with concrete to the top, and cement slurry is injected into the first grouting pipe 103 to seal the filling gap at the top of the gas drainage drill site 1. Before filling the concrete, a formwork needs to be installed at the junction of the gas drainage drill site 1 and the backfill section 2. The formwork is used to block the concrete filled in the gas drainage drill site 1 to prevent the concrete from flowing into the backfill section 2. The formwork is installed at a position 0.5 m away from the top of the gas drainage drill site 1, and an opening of 0.5 m is reserved for pouring concrete, and the formwork is removed after the concrete solidifies.

[0053] The first grouting pipe 103 can specifically be a perforated steel pipe with a diameter of 42 mm.

[0054] S2: Install the connecting pipe 201 in the backfill section 2. Divide the backfill of the backfill section 2 into a first backfill layer 202 and a second backfill layer 203. The first backfill layer 202 is mechanically backfilled, and the second backfill layer 203 is manually backfilled with bagged materials. Specifically, after installing the connecting pipe 201, take compressive protection measures for the connecting pipe 201 to prevent it from being damaged by the backfill materials. The protection measures can be to wrap the connecting pipe 201 with bricks. The second backfill layer 203 is located between the first backfill layer 202 and the top of the backfill section 2. The thickness of the second backfill layer 203 is 1.5 m - 2.5 m, and the specific thicknesses are 1.5 m, 1.8 m, 2 m, 2.2 m, and 2.5 m.

[0055] Manually backfilling with bagged materials specifically means pre - filling the materials to be backfilled (such as soil, sand, gravel, construction waste, etc.) into bags (such as woven bags, gunny bags, etc.), and then manually transporting these bags filled with materials to the second backfill layer 203 for layer - by - layer stacking and filling construction operations.

[0056] S3: Install the inlet pipe 403 in the plugging section 3. Reserve a second grouting pipe 301 at the top of the plugging section 3. Fill the plugging section 3 with concrete up to the top, and inject cement slurry into the second grouting pipe 301 to plug the filling gap at the top of the plugging section 3.

[0057] Specifically, the inlet pipe 403 is installed on the bottom plate of the plugging section 3 and is pre - wrapped with concrete to protect the inlet pipe 403 from being damaged by the subsequently poured concrete.

[0058] Before filling the concrete, it is necessary to install a formwork on the side of the plugging section 3 facing the opening of the auxiliary tunnel. The formwork is used to block the concrete filled in the plugging section 3. The formwork is installed at a position 0.5 m away from the top of the plugging section 3, leaving an opening of 0.5 m for pouring the concrete, and the formwork is removed after the concrete solidifies.

[0059] The second grouting pipe 301 can specifically be a perforated steel pipe with a diameter of 42 mm.

[0060] S4: Install the gas - water separation chamber 401, water chamber 402, exhaust pipe 404, and drain pipe 405 of the gas - water separation chamber 4, and connect the inlet pipe 403 to the gas - water separation chamber 401 to complete the construction.

[0061] Specifically, first install the water-gas chamber 401 and the water chamber 402 into the pits opened on the bottom plate of the auxiliary adit. The water-gas chamber 401 is installed on the side facing the plugging section 3, and the water chamber 402 is installed on the side away from the plugging section 3. Install a connecting pipe between the bottoms of the water-gas chamber 401 and the water chamber 402. Connect one end of the drain pipe 405 to the water chamber 402 at a position higher than the connecting pipe, and connect the other end of the drain pipe 405 to the drain ditch of the auxiliary adit. Connect one end of the exhaust pipe 404 to the top of the water-gas chamber 401, and extend the other end of the exhaust pipe 404 along the auxiliary adit to the outside of the entrance of the auxiliary adit. Inject water into the water-gas chamber 401 and the water chamber 402 until the water level exceeds the connecting pipe.

[0062] In the present invention, the discharge path of the groundwater in the water and gas in the gas drainage drill site 1 is: circumferential pipe 101 → longitudinal pipe 102 → connecting pipe 201 → inlet pipe 403 → water-gas chamber 401 → water chamber 402 → drain pipe 405 → the drain ditch of the auxiliary adit. The discharge path of the gas in the water and gas in the gas drainage drill site 1 is: circumferential pipe 101 → longitudinal pipe 102 → connecting pipe 201 → inlet pipe 403 → water-gas chamber 401 → exhaust pipe 404 → the outside of the entrance of the auxiliary adit.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A water and gas discharge structure applicable to auxiliary adits in gas tunnels, characterized in that Comprising: A blind pipe and concrete disposed in the gas drainage drill site (1), the blind pipe being provided on the wall of the gas drainage drill site (1), holes being provided on the wall of the blind pipe, and the concrete being used to fill the gas drainage drill site (1); A backfill section (2), a plugging section (3) and a water-gas separation chamber (4) disposed in the auxiliary tunnel; The backfill section (2) is connected to the gas drainage drill site (1), a connecting pipe (201) is provided in the backfill section (2), the connecting pipe (201) is communicated with the blind pipe, and the backfill section (2) is filled with backfill; The plugging section (3) is located between the backfill section (2) and the water-gas separation chamber (4), and the plugging section (3) is filled with concrete; The water-gas separation chamber (4) includes an inlet pipe (403), the inlet pipe (403) passes through the plugging section (3) and is communicated with the connecting pipe (201), and the water-gas separation chamber (4) is used to separate the gas in the water-gas and discharge the separated gas out of the opening of the auxiliary tunnel.

2. The water-gas discharge structure applicable to the auxiliary adit of a gas tunnel according to claim 1, wherein, The blind pipe includes a circumferential pipe (101) and a longitudinal pipe (102), the circumferential pipe (101) is arranged circumferentially along the wall of the gas drainage drill site (1), and one circumferential pipe (101) is provided every 1 m - 3 m along the length direction of the gas drainage drill site (1), and adjacent two circumferential pipes (101) are communicated through the longitudinal pipe (102), and the longitudinal pipe (102) is provided on the bottom plate of the gas drainage drill site (1).

3. The water and gas discharge structure applicable to the auxiliary adit of the gas tunnel according to claim 2, characterized in that, Both the circumferential pipe (101) and the longitudinal pipe (102) are double-wall perforated corrugated pipes, and geotextiles are wrapped on the outer sides of the circumferential pipe (101) and the longitudinal pipe (102).

4. A water and gas discharge structure applicable to an auxiliary adit of a gas tunnel according to claim 3, characterized in that, Partition plates are provided on the outer sides of the circumferential pipe (101) and the longitudinal pipe (102).

5. A water and gas discharge structure applicable to an auxiliary adit of a gas tunnel according to any one of claims 1-4, characterized in that, The water-gas separation chamber (4) further includes a water-gas chamber (401), a water chamber (402), an exhaust pipe (404) and a drain pipe (405), the inlet pipe (403) is communicated with the water-gas chamber (401), the exhaust pipe (404) is communicated at the top of the water-gas chamber (401), a communicating pipe is provided between the water-gas chamber (401) and the water chamber (402), the drain pipe (405) is communicated with the water chamber (402), and the connection position of the drain pipe (405) is higher than the communicating pipe.

6. The water-gas discharge structure applicable to the auxiliary adit of a gas tunnel according to claim 5, characterized in that, The backfill is hard rock debris.

7. The water-gas discharge structure applicable to the auxiliary adit of a gas tunnel according to claim 5, characterized in that, The length of the backfill section (2) is 20 m - 30 m, and the length of the plugging section (3) is 8 m - 15 m.

8. A water and gas discharge structure applicable to auxiliary adits in gas tunnels according to claim 5, characterized in that, Both the connecting pipe (201) and the inlet pipe (403) are PVC pipes.

9. The water-gas discharge structure applicable to the auxiliary adit of a gas tunnel according to claim 5, characterized in that, A plurality of water stop rings are provided on the outer wall of the part where the inlet pipe (403) passes through the plugging section (3).

10. A construction method for a water and gas discharge structure applicable to auxiliary adits in gas tunnels, characterized in that, Applied to a water-gas discharge structure suitable for an auxiliary tunnel of a gas tunnel as described in any one of claims 5 - 9, comprising the following steps: S1: After wrapping the circumferential pipe (101) and the longitudinal pipe (102) with geotextile, arrange them in the gas drainage drill site (1). Install partition plates on the outer sides of the circumferential pipe (101) and the longitudinal pipe (102). Reserve the first grouting pipe (103) at the top of the gas drainage drill site (1). Fill the gas drainage drill site (1) with concrete up to the top, and inject cement slurry into the first grouting pipe (103) to seal the filling gap at the top of the gas drainage drill site (1). S2: Install the connecting pipe (201) in the backfill section (2). Divide the backfill of the backfill section (2) into the first backfill layer (202) and the second backfill layer (203). The first backfill layer (202) is backfilled mechanically, and the second backfill layer (203) is backfilled manually with bags. S3: Install the inlet pipe (403) in the plugging section (3). Reserve the second grouting pipe (301) at the top of the plugging section (3). Fill the plugging section (3) with concrete up to the top, and inject cement slurry into the second grouting pipe (301) to seal the filling gap at the top of the plugging section (3). S4: Install the gas-water separation chamber (401), water chamber (402), exhaust pipe (404) and drain pipe (405) of the gas-water separation chamber (4), and connect the inlet pipe (403) to the gas-water separation chamber (401) to complete the construction.

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