Tunnel sealing water and gas discharge system

Abstract

The tunnel sealed water and gas discharge system provided by the present invention comprises a lining structure, a side ditch casting structure, a roadbed, and a drainage structure. The side ditch casting structure is provided with a drainage ditch and a cable ditch; the drainage structure comprises a transverse drainage pipe, a longitudinal blind pipe, an annular blind pipe, and a sealing pipe. The annular blind pipe surrounds the lining structure and the surrounding rock layer. The longitudinal blind pipe is arranged between the lining structure and the surrounding rock layer along the extension direction of the tunnel. The annular blind pipe is connected with the longitudinal blind pipe. One end of the transverse drainage pipe is connected with the longitudinal blind pipe. The lining structure comprises a gas isolation layer. The sealing pipe is made of glass fiber reinforced plastic as a whole. The sealing pipe is arranged in the side ditch casting structure. The drainage ditch is the internal space of the sealing pipe. The sealing pipe comprises a pipe body and an inspection well portion. The inspection well portion is provided with an inspection port and a well cover. The present invention performs a closed transformation on the drainage ditch, and adopts glass fiber reinforced plastic to sew a polymer anti-seepage material to make a closed structure, so as to realize that water and gas are not exposed in the cave during the entire discharge process.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel lining support and drainage, and particularly relates to a tunnel sealed water and gas discharge system. Background Art

[0002] Common harmful gases in the tunnel excavation stratum are gas and hydrogen sulfide. For a tunnel with only gas escaping, since gas is insoluble in water and lighter than air, a water-gas separation device is set up. For example, the water-gas separation system in a gas tunnel disclosed in the Chinese utility model patent with the publication number CN210768895U uses a water seal to keep the lighter gas introduced upward into the corresponding pipeline to prevent it from being discharged into the drainage ditch to prevent harm.

[0003] However, the water-gas separation device has the disadvantages of being easily blocked and unable to isolate gas when there is no water, and its reliability is relatively low. And when the gas escaping in the tunnel is mixed with harmful gases that are soluble in water and have a relatively large specific gravity, such as hydrogen sulfide, the conventional water-gas separation device cannot separate the harmful gases, and the water in the water-gas separation device is exposed in the drainage ditch, which is likely to cause safety accidents. Summary of the Invention

[0004] The purpose of the present invention is to provide a tunnel sealed water and gas discharge system that can effectively prevent harmful gases from escaping in the tunnel.

[0005] The tunnel sealed water and gas discharge system provided by the present invention includes a lining structure, a side ditch casting structure, a roadbed, and a drainage structure. The lining structure is arranged on the inner side of the surrounding rock layer. The lining structure includes an inverted arch lining part at its bottom. The roadbed and the side ditch casting structure are both arranged above the inverted arch lining part, and the two side ditch casting structures are located on the opposite sides of the roadbed. The side ditch casting structure is provided with a drainage ditch and a cable trench; the drainage structure includes a transverse drainage pipe, a longitudinal blind pipe, and a circumferential blind pipe. The circumferential blind pipe surrounds between the lining structure and the surrounding rock layer. The longitudinal blind pipe is arranged between the lining structure and the surrounding rock layer along the extension direction of the tunnel. The circumferential blind pipe is communicated with the longitudinal blind pipe. One end of the transverse drainage pipe is communicated with the longitudinal blind pipe; the lining structure includes a primary support layer, a closed-cell foam plastic cushion layer, a gas isolation layer, and a secondary lining layer arranged in sequence from outside to inside; the drainage structure further includes a sealing pipe. The sealing pipe is integrally made of fiberglass. The sealing pipe is arranged in the side ditch casting structure, and the drainage ditch is the inner space of the sealing pipe; the sealing pipe includes a pipe body part and an inspection well part. The top of the inspection well part is provided with an inspection opening and a detachable manhole cover; the transverse drainage pipe is communicated with the pipe body part; the horizontal position of the bottom surface of the cable trench is higher than the horizontal position of the bottom surface of the inspection well part. The bottom surface of the cable trench is communicated with the bottom of the first side wall surface of the inspection well part through a first water-sealed drainage blind pipe; the roadbed is provided with a sunken drainage groove. The horizontal position of the bottom surface of the drainage groove is higher than the horizontal position of the bottom surface of the inspection well part. The bottom surface of the drainage groove is communicated with the bottom of the second side wall surface of the inspection well part through a second water-sealed drainage blind pipe.

[0006] As can be seen from the above solution, first, by setting a gas isolation plate layer, the water and gas gushing out from the surrounding rock are isolated from the secondary lining. The longitudinal blind pipe and the circumferential blind pipe are provided with water permeability behind the lining structure. By collecting water and gas, it is prevented that water accumulates behind the lining structure and damages the lining structure. Then, a transverse drain pipe is set to introduce water into the side ditch on the inner side of the tunnel. At the same time, the side ditch is renovated to be airtight, and a closed structure is made of a fiberglass-sewn polymer anti-seepage material, so as to realize that water and gas are not exposed in the tunnel during the whole discharge process. In addition, both the first water-sealed drain blind pipe and the second water-sealed drain blind pipe are connected to the bottom of the side wall of the inspection well section. This setting can form a water seal between the inspection well section, the drain trough and the cable trench, so as to avoid the exposure of water and gas while discharging water.

[0007] A further solution is that the inspection well section extends upward to the top of the side ditch casting structure, and the manhole cover is exposed on the top of the side ditch casting structure; the side ditch casting structure covers the pipe body part from above and both sides of the pipe body part.

[0008] An even further solution is that the side ditch casting structure hermetically shields the pipe body part from above and both sides of the pipe body part.

[0009] As can be seen from the above, except that the inspection opening provides an exposed inspection position for the staff, the other parts of the sealed pipe are hermetically sealed in the side ditch casting structure, so as to further ensure the sealing performance and further avoid the exposure of water and gas.

[0010] A further solution is that along the extending direction of the sealed pipe, the cross section of the pipe body part is square, the pipe body part includes four glass pipe walls arranged around, and the transverse drain pipe is connected to one glass pipe wall located on the side of the pipe body part.

[0011] As can be seen from the above, this setting is beneficial to forming a placement groove for the sealed pipe in the side ditch casting structure, is easy to position and fix the sealed pipe in the side ditch casting structure, and is beneficial to the connection and sealing of the sealed pipe with the transverse drain pipe, the first water-sealed drain blind pipe and the second water-sealed drain blind pipe.

[0012] An even further solution is that the transverse drain pipe is connected to the upper part of the glass pipe wall.

[0013] As can be seen from the above, this setting ensures that the outlet of the transverse drain pipe is at a higher water level, ensuring the drainage function.

[0014] An even further solution is that along the height direction, the inner contour of the inspection well section is circular, and the contour of the manhole cover is circular.

[0015] As can be seen from the above, this setting is beneficial to the setting of the manhole cover and prevents the manhole cover from falling.

[0016] An even further solution is that the inner diameter of the inspection well section is greater than the width of the pipe body part.

[0017] As can be seen from the above, this setting facilitates later maintenance and silt cleaning.

[0018] A further solution is that along the extension direction of the sealed pipe, inspection well parts are arranged at preset intervals in the sealed pipe.

[0019] As can be seen from the above, this setting is conducive to the staff to inspect different extension sections.

[0020] A further solution is that transversely in the tunnel, the two drain troughs are respectively arranged at opposite ends of the roadbed.

[0021] A further solution is that the tunnel sealed water and gas discharge system further includes a road surface casting layer, the road surface casting layer is arranged above the roadbed, and the road surface casting layer hermetically shields the drain trough from above.

[0022] As can be seen from the above, this setting can further prevent harmful gases in the drainage ditch from escaping into the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the first embodiment of the tunnel sealed water and gas discharge system of the present invention.

[0024] Figure 2 It is a partial enlarged view of the first embodiment of the tunnel sealed water and gas discharge system of the present invention.

[0025] Figure 3 It is a schematic diagram of the first embodiment of the tunnel sealed water and gas discharge system of the present invention from a top view perspective of the side ditch casting structure.

[0026] Figure 4 It is a schematic diagram of the second embodiment of the tunnel sealed water and gas discharge system of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The First Embodiment of the Tunnel Sealed Water and Gas Discharge System

[0028] Refer to Figure 1 , Figure 1 which is a schematic cross-sectional view in the extension direction of the tunnel. The tunnel sealed water and gas discharge system includes a lining structure 1, a side ditch casting structure 2, a roadbed 3, a road surface casting layer 4 and a drainage structure 5. The lining structure 1 is arranged around the hole, the lining structure 1 is located inside the surrounding rock layer 9, and the lining structure 1 includes a primary support layer 11, a closed-cell foam plastic cushion layer 12, a gas isolation layer 13 and a secondary lining layer 14 arranged in sequence from outside to inside. Among them, the gas isolation layer 13 uses a gas isolation board. Under this setting, water and gas can be isolated outside the secondary lining layer 14.

[0029] The lining structure 1 includes an invert lining part 19 at its bottom. The ballast bed 3 and the road surface casting layer 4 are sequentially arranged above the invert lining part 19 from bottom to top and are located in the middle in the transverse direction of the tunnel. The side ditch casting structure 2 is located inside the lining structure 1 and above the invert lining part 19. In the transverse direction of the tunnel, a side ditch casting structure 2 is provided on each of the opposite sides of the ballast bed 3 and the road surface casting layer 4.

[0030] The drainage structure 5 includes a transverse drain pipe 53, a longitudinal blind pipe 52, and a circumferential blind pipe 51. The circumferential blind pipe 51 is arranged around between the lining structure 1 and the surrounding rock layer 9. The longitudinal blind pipe 52 is arranged between the lining structure 1 and the surrounding rock layer 9 along the extension direction of the tunnel. The circumferential blind pipe 51 is communicated with the longitudinal blind pipe 52. One end of the transverse drain pipe 53 is communicated with the longitudinal blind pipe 52. As Figure 1 shown, a drainage ditch 21 and a cable trench 22 are provided on the side ditch casting structure 2. The other end of the transverse drain pipe 53 is communicated with the drainage ditch 21. With this setting, the drainage structure 5 can introduce water and gas into the drainage ditch 21.

[0031] Combined with Figure 1 and Figure 2 , the drainage structure 5 further includes a sealing pipe 6. Figure 2 The cross-sectional schematic diagram of the location of the inspection well part 62 in the sealing pipe 6 is shown. The sealing pipe 6 includes a pipe body part 61 and an inspection well part 62. As Figure 3 shown, the sealing pipe 6 extends along the extension direction of the tunnel. In the extension direction of the sealing pipe 6, an inspection well part 62 is provided every 50 meters in the sealing pipe 6.

[0032] The sealing pipe 6 is integrally made of fiberglass. In this embodiment, along the extension direction of the sealing pipe 6, the cross-section of the sealing pipe 6 is square. The pipe body part 61 includes four fiberglass walls 611 arranged around. The inner contour of the pipe body part 61 is a square with a size of 400mm×400mm. Along the height direction, the inner contour of the inspection well part 62 is circular. An inspection opening 620 and a detachable manhole cover 621 are provided at the top of the inspection well part 62. The contour of the manhole cover 621 is also circular. The inner diameter of the inspection well part 62 is 600mm.

[0033] From Figure 2 it can be seen that the sealing pipe 6 is integrally arranged in the side ditch casting structure 2. The internal space of the sealing pipe 6 serves as the drainage ditch 21 of the side ditch casting structure 2. Among them, the pipe body part 61 is arranged as the inner lining of the side ditch in the side ditch of the side ditch casting structure 2. The side ditch casting structure 2 covers the pipe body part 61 from above and both sides of the pipe body part 61 and hermetically shields the pipe body part 61 from above and both sides of the pipe body part 61. In addition, the inspection well part 62 extends upward to the top of the side ditch casting structure 2, and the manhole cover 621 is exposed on the top of the side ditch casting structure 2.

[0034] Refer to Figure 2, the horizontal drain pipe 53 is connected to a glass pipe wall 611 on the side of the pipe body 61 and communicates with the drainage ditch 21, and the horizontal drain pipe 53 is connected to the upper part of the glass pipe wall 611. In addition, the horizontal position of the bottom surface of the cable trench 22 is higher than the horizontal position of the bottom surface of the inspection well section 62. The bottom surface of the cable trench 22 and the bottom of the first side wall surface 628 of the inspection well section 62 are communicated by a first water-sealed drain blind pipe 71. Among them, as Figure 2 shown, in the transverse direction of the tunnel, the port of the first water-sealed drain blind pipe 71 communicates with the edge 229 closest to the inspection well section 62 on the bottom surface of the cable trench 22. Therefore, the first water-sealed drain blind pipe 71 has a shorter distance and saves materials. Among them, in the transverse direction of the tunnel, along the direction gradually approaching the inspection well section 62, the bottom surface of the cable trench 22 gradually slopes downward and extends to the edge 229. In addition, as Figure 3 shown, a cover plate 221 can also be provided to cover the upper opening of the cable trench 22. In addition, in the extending direction of the tunnel, a first water-sealed drain blind pipe 71 is provided every 100 meters, that is, a first water-sealed drain blind pipe 71 is provided every other inspection well section 62 to communicate the sealed pipe 6 to the cable trench 22 through the first water-sealed drain blind pipe 71.

[0035] See Figure 1 and Figure 2 , a sunken drain trough 31 with a semi-circular cross-section is provided at the upper end of the roadbed 3. In the transverse direction of the tunnel, the two drain troughs 31 are respectively arranged at the opposite ends of the roadbed 3, and the road surface pouring layer 4 hermetically covers the drain trough 31 from above. The horizontal position of the bottom surface of the drain trough 31 is higher than the horizontal position of the bottom surface of the inspection well section 62. The bottom surface of the drain trough 31 and the bottom of the second side wall surface 629 of the inspection well section 62 are communicated by a second water-sealed drain blind pipe 72. Among them, the first side wall surface 628 and the second side wall surface 629 are arranged opposite to each other in the transverse direction of the tunnel. In the transverse direction of the tunnel, the drain trough 31 is arranged at the position on the roadbed 3 closest to the inspection well section 62. Therefore, the second water-sealed drain blind pipe 72 has a shorter distance and saves materials. Among them, the bottom surface of the drain trough 31 has a trough bottom at the lowest horizontal position, and the second water-sealed drain blind pipe 72 communicates with the trough bottom of the drain trough 31. In addition, in the extending direction of the tunnel, a second water-sealed drain blind pipe 72 is provided every 100 meters, that is, a second water-sealed drain blind pipe 72 is provided every other inspection well section 62 to communicate the sealed pipe 6 to the drain trough 31 through the second water-sealed drain blind pipe 72.

[0036] First, by setting the gas isolation layer 13, the water and gas gushing out from the surrounding rock are isolated from the secondary lining layer 14. The longitudinal blind pipe 52 and the circumferential blind pipe 51 are arranged behind the lining structure 1 to be permeable to water. By collecting water and gas, it is prevented that water accumulates behind the lining structure 1 and damages the lining structure 1. Then, a transverse drain pipe 53 is set to introduce water into the side drain 21 inside the tunnel. At the same time, the drain 21 is transformed into a sealed structure, and a sealed structure is made of a fiberglass-sewn polymer anti-seepage material, so as to realize that water and gas are not exposed in the tunnel during the whole discharge process. In addition, both the first water-sealed drain blind pipe 71 and the second water-sealed drain blind pipe 72 are connected to the bottom of the side wall surface of the inspection well part 62. This setting can form a water seal between the inspection well part 62, the drain trough 31 and the cable trench 22, so as to avoid the exposure of water and gas while discharging water. Therefore, the present invention can effectively prevent harmful gases from escaping in the tunnel.

[0037] Second Embodiment of Tunnel Sealed Water and Gas Discharge System

[0038] See Figure 4 , in this embodiment, the inner diameter of the inspection well part 82 is the same as the width of the pipe body part 81.

[0039] Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tunnel sealing water vapor discharge system, comprising a lining structure, a side ditch casting structure, a ballast and a drainage structure, wherein the lining structure is arranged on the inner side of the surrounding rock layer, the lining structure comprises an inverted arch lining part located at the bottom thereof, the ballast and the side ditch casting structure are both arranged above the inverted arch lining part, and two side ditch casting structures are located on opposite sides of the ballast, and the side ditch casting structure is provided with a drainage ditch and a cable ditch; The drainage structure includes a transverse drainage pipe, a longitudinal blind pipe and an annular blind pipe, wherein the annular blind pipe surrounds the lining structure and the surrounding rock layer, the longitudinal blind pipe is arranged between the lining structure and the surrounding rock layer along the extension direction of the tunnel, the annular blind pipe is connected to the longitudinal blind pipe, and one end of the transverse drainage pipe is connected to the longitudinal blind pipe; Features: The lining structure comprises an initial support layer, a closed-cell foam plastic cushion layer, a gas isolation layer and a secondary lining layer which are arranged in sequence from the outside to the inside; The drainage structure also includes a sealing pipe, which is made of glass fiber reinforced plastics as a whole. The sealing pipe is arranged in the side ditch casting structure, and the drainage ditch is the internal space of the sealing pipe; The sealing pipe comprises a pipe body and an inspection well portion, and the top of the inspection well portion is provided with an inspection port and a detachable well cover; The transverse drainage pipe is in communication with the pipe body; The horizontal position of the bottom surface of the cable trench is higher than the horizontal position of the bottom surface of the inspection well portion, and the bottom surface of the cable trench is connected to the bottom of the first side wall surface of the inspection well portion through a first water seal drainage blind pipe; The roadbed is provided with a recessed drainage trough, the horizontal position of the bottom surface of the drainage trough is higher than the horizontal position of the bottom surface of the inspection well portion, and the bottom surface of the drainage trough is connected to the bottom of the second side wall surface of the inspection well portion by a second water seal drainage blind pipe.

2. The tunnel sealing water vapor exhaust system according to claim 1, characterized in that: The inspection well portion extends upward to the top of the side ditch casting structure, and the well cover is exposed at the top of the side ditch casting structure; The side ditch casting structure covers the pipe body from above and both sides of the pipe body.

3. The tunnel sealing water vapor exhaust system according to claim 2, characterized in that: The side ditch casting structure seals and shields the pipe body from above and both sides of the pipe body.

4. The tunnel sealing water vapor exhaust system according to any one of claims 1 to 3, characterized in that: Along the extending direction of the sealing tube, the cross section of the tube body is square, the tube body includes four glass tube walls arranged around, and the transverse drain pipe is connected to one of the glass tube walls located on the side of the tube body.

5. The tunnel sealing water vapor exhaust system according to claim 4, characterized in that: The transverse drain pipe is connected to the upper part of the glass tube wall.

6. The tunnel sealing water vapor exhaust system according to claim 5, characterized in that: Along the height direction, the inner contour of the inspection well portion is circular, and the contour of the well cover is circular.

7. The tunnel sealing water vapor exhaust system according to claim 6, characterized in that: The inner diameter of the inspection well portion is greater than the width of the pipe body portion.

8. The tunnel sealing water vapor exhaust system according to any one of claims 1 to 3, characterized in that: Along the extending direction of the sealing tube, one inspection well portion is arranged in the sealing tube at a preset distance.

9. The tunnel sealing water vapor exhaust system according to any one of claims 1 to 3, characterized in that: In the transverse direction of the tunnel, the two drainage channels are respectively arranged at opposite ends of the roadbed.

10. The tunnel sealing water vapor exhaust system according to claim 9, characterized in that: The tunnel sealing water vapor discharge system also includes a pavement casting layer, which is arranged above the roadbed and seals and shields the drainage trough from above.

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