Drainage system for reverse slope tunnel construction

Abstract

The utility model discloses a reverse slope tunnel construction drainage system which comprises a main tunnel, a drainage tunnel and an excess length cable cavity, a central drainage ditch is formed in the center of the main tunnel, the end, close to the tunnel face of the main tunnel, of the central drainage ditch is connected to a clear water fixed pump station, and the clear water fixed pump station is communicated with the central drainage ditch through a second water conveying pipe. First clean water ditches are formed in the two sides of the main tunnel and communicated with the central drainage ditch through communicating pipes, a water bin is arranged in the extra-length cable cavity, a water suction pump is arranged in the water bin, a sewage pipe is arranged on one side of the drainage tunnel, the water inlet end of the sewage pipe is connected with a sewage moving pump station, and a second clean water ditch is formed in the other side of the drainage tunnel. The second clean water ditch is communicated with the central drainage ditch through a transverse water conduit, and the water outlet end of the second clean water ditch is positioned outside the drainage tunnel. The treatment difficulty of tunnel construction wastewater can be effectively reduced, the sewage treatment capacity is reduced, and the sewage treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of railway tunnel construction safety protection, in particular to a reverse slope tunnel construction drainage system. Background Art

[0002] The tunnel drainage system is an important part of high-speed railway tunnel construction, and drainage assurance is a key indicator. The main source of tunnel construction wastewater is the contaminated groundwater discharged during tunnel construction. The underground water gushing out near the heading face (originally clean water) becomes wastewater after encountering rock powder, rock chips, cement slurry, etc., and is also the main source of construction wastewater; uncontaminated underground water is mostly clean water and is also an important source of construction wastewater.

[0003] Sewage is not allowed to be discharged directly and must be treated before reuse or re-discharge. However, traditional tunnel construction often neglects the separation of clean and polluted water, and usually treats all sewage, resulting in significant economic investment and waste.

[0004] Therefore, there is an urgent need for a reverse slope tunnel construction drainage system to achieve the separation and diversion of construction wastewater, so as to reduce the investment in water treatment and the waste of water resources during tunnel construction. Utility Model Content

[0005] The utility model provides a reverse slope tunnel construction drainage system, which can not only effectively reduce the difficulty of treating tunnel construction wastewater, but also improve the separation of clean water and sewage for discharge, so that sewage will not pollute clean water. After treatment, the clean water can be used for production and domestic water, which can greatly improve the environmental protection effect.

[0006] A reverse slope tunnel construction drainage system includes a main tunnel, a drainage tunnel, and a surplus length cable cavity. A central drainage ditch is opened in the center of the main tunnel. One end of the central drainage ditch close to the main tunnel face is connected to the water inlet end of the clean water fixed pump station through a first water pipe. The water outlet end of the clean water fixed pump station is connected to one end of the central drainage ditch located in the entrance work area through a second water pipe. First clean water ditches are opened on both sides of the main tunnel. The first clean water ditches are connected to the central drainage ditch through a connecting pipe. A water pipe is provided in the surplus length cable cavity. A water tank is provided in the water tank, and a water pump is provided in the water tank, and the water outlet of the water pump is connected to the central drainage ditch through a third water supply pipe. A sewage pipe is provided on one side of the drainage hole, and the water inlet end of the sewage pipe is connected to the water outlet end of the sewage mobile pump station provided in the main tunnel construction area. The water outlet end of the sewage pipe is connected to the sewage treatment facility outside the drainage hole. A second clear water ditch is opened on the other side of the drainage hole, and the second clear water ditch is connected to the central drainage ditch through a horizontal water diversion pipe. The water outlet end of the second clear water ditch is located outside the drainage hole.

[0007] Furthermore, the main tunnel and the drainage tunnel are connected through a transverse passage, and the transverse water diversion pipe is buried in the transverse passage.

[0008] Furthermore, an I-beam is erected on the top of the water tank, and wooden boards are fully laid above the I-beam.

[0009] Furthermore, the spacing between the I-beams is 50 cm, and the thickness of the wooden board is 3 cm.

[0010] Furthermore, water collection pits are provided on both sides of the first clear water ditch.

[0011] Furthermore, a cover plate is provided above the first clear water ditch and the sump.

[0012] Furthermore, sewage discharge ditches are arranged side by side in the drainage hole beside the second clear water ditch.

[0013] Furthermore, a sedimentation tank is provided on one side of the water tank close to the main hole. The sedimentation tank is provided at a height higher than the water tank, and the sedimentation tank is connected to the water tank through an overflow hole.

[0014] Beneficial effects:

[0015] 1. This drainage system not only enables the timely discharge of accumulated water near the face of the reverse slope tunnel, ensuring the stability of the face and reducing construction risks, but also realizes the separation of construction wastewater by quality and quality, thus avoiding the pollution of clean water by sewage generated by tunnel construction to the greatest extent. It can effectively reduce the difficulty of tunnel construction wastewater treatment, reduce the amount of sewage treatment, and reduce the cost of sewage treatment. At the same time, it can effectively reduce the workload of the treatment system and reduce the cost of tunnel engineering construction.

[0016] 2. This drainage system has the characteristics of clear pipeline layout, clear clean and sewage diversion paths, and convenient on-site installation and management. It is suitable for the construction of high-speed railway tunnels with large amounts of water leakage and gushing.

[0017] 3. A water tank is set up at the position of the traditional excess cable cavity to collect the clean water in the cross channel. Then, the tunnel construction wastewater and the seepage water behind the tunnel lining are introduced into the drainage ditch through the drainage structure and discharged out of the tunnel through the drainage ditch. This not only ensures the safety of tunnel construction, but also allows backfilling after the tunnel is broken through, effectively reducing the difficulty of tunnel construction and the workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the pipeline layout of the utility model;

[0019] Figure 2 yes Figure 1 AA section view;

[0020] Figure 3 yes Figure 1 BB cross-sectional view. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0022] like Figure 1-Figure 3 As shown, this embodiment proposes a reverse slope tunnel construction drainage system, including a main tunnel 1, a drainage tunnel 2, and a spare length cable cavity 3. The main tunnel 1 and the drainage tunnel 2 are connected by a number of transverse passages 16. A central drainage ditch 4 is provided in the center of the main tunnel 1. The end of the central drainage ditch 4 close to the main tunnel face is connected to the water inlet end of the fixed clean water pump station 6 through a first water pipe 5. The water outlet end of the fixed clean water pump station 6 is connected to the end of the central drainage ditch 4 located in the entrance work area through a second water pipe 7. First clean water ditches 8 are provided on both sides of the main tunnel 1. The first clean water ditch 8 is connected to the central drainage ditch 4 through a connecting pipe 9. A water tank 10 is provided in the spare length cable cavity 3. A water pump 11 is provided in the water tank 10. The water outlet is connected to the central drainage ditch 4 through the third water supply pipe 12. A sewage pipe 13 is provided on one side of the drainage hole 2. The water inlet end of the sewage pipe 13 is connected to the water outlet end of the sewage mobile pump station 14 located in the construction area of ​​the main tunnel 1. The water outlet end of the sewage pipe 13 is connected to the sewage treatment facility outside the drainage hole 2. A second clear water ditch 24 is opened on the other side of the drainage hole 2. The second clear water ditch 24 is connected to the central drainage ditch 4 through a horizontal water diversion pipe 15. The horizontal water diversion pipe 15 is buried in the horizontal channel 16. A temporary blocking structure 23 is provided downstream of the water inlet end of the horizontal water diversion pipe 15 in the central drainage ditch 4 to ensure that clean water can flow into the horizontal water diversion pipe 15. The water outlet end of the second clear water ditch 24 is located outside the drainage hole 2.

[0023] See attached Figure 2 An I-beam 17 is erected on the top of the water tank 10, and a wooden board 18 is fully laid on the top of the I-beam 17. The wooden board 18 laid on the I-beam 17 can make the extra long cable cavity 3 above the water tank 10 be used normally.

[0024] Preferably, the spacing between the I-beams 17 is 50 cm, and the thickness of the wooden board 18 is 3 cm.

[0025] from Figure 2 It can also be seen that a sump 19 is provided on both sides of the first clear water ditch 8. By setting the sump 19, the first clear water ditch 8 can be improved to collect the clean water flowing into the hole behind the lining, thereby improving the drainage effect of the system.

[0026] Preferably, a cover plate 20 is provided above the first clear water ditch 8 and the sump 19. By providing the cover plate 20, safety during construction can be increased, and workers or equipment can be prevented from being harmed by the first clear water ditch 8 and the sump 19.

[0027] See attached Figure 2 A sedimentation tank 22 is provided on the side of the water tank 10 near the main tunnel 1. The sedimentation tank 22 is higher than the water tank 10 and is connected to the water tank 10 through an overflow hole. The sedimentation tank 22 allows water that has seeped into the water tank 10 to settle before entering the water tank 10, thereby further separating clean and dirty water, ensuring that the water in the water tank 10 can be directly pumped into the central drainage ditch 4 and discharged out of the drainage tunnel 2 through the horizontal water diversion pipe 15 and the second clean water ditch 24.

[0028] from Figure 3 It can be seen that a sewage discharge ditch 21 is provided side by side in the drainage hole 2 beside the second clean water ditch 24, so as to collect a small amount of sewage generated in the drainage hole 2 due to various reasons and discharge it outside the hole for treatment, further avoiding the pollution of clean water by sewage, thereby effectively reducing the difficulty of treating tunnel construction wastewater.

[0029] Working principle:

[0030] Since the groundwater and construction wastewater in the excavation section of the main tunnel face, primary support and unfinished secondary lining section are sewage, the water discharged into the main tunnel 1 behind the lining of the completed lining section is clean water. The sewage needs to be collected and discharged to the sewage treatment plant outside the tunnel for treatment before discharge, while the clean water can be collected and discharged directly outside the main tunnel 1;

[0031] Therefore, this system utilizes the central drainage ditch 4, the first clear water ditch 8 in the main tunnel 1, and the second clear water ditch 24 in the drainage tunnel 2 to collect the clean water flowing into the tunnel from behind the lining. The clean water collected by the first clear water ditch 8 flows into the central drainage ditch 4, and the clean water collected by the central drainage ditch 4 flows to the side close to the main tunnel face. Under the pumping of the fixed clean water pump station 6, it flows into the second clear water ditch 24 through the first water pipe 5, the second water pipe 7, and the horizontal water pipe 15, and is then directly discharged to the outside of the tunnel.

[0032] The sewage mobile pump station 14 collects the sewage and discharges it through the sewage pipe 13 to the sewage treatment device outside the drainage hole 2 for treatment;

[0033] In addition, after the drainage tunnel 2 is connected, the drainage tunnel 2 in the entrance work area to the cross channel 16 and the small mileage area are all clean water. Therefore, the clean water is collected by the central drainage ditch 4 and then flows into the second clean water ditch 24 through the horizontal water diversion pipe 15 and then directly discharged to the outside of the tunnel;

[0034] After the drainage tunnel 2 is connected, the drainage tunnel 2 within the inlet work area needs to consider the separation of clean and sewage from the transverse channel 16 to the larger mileage range. The clean water in this section is collected by the first clean water ditch 8 to the sedimentation tank 22 and then flows to the water tank 10. The clean water in the water tank 10 is transported to the first clean water ditch 8 outside the section through the third water pipe 12 by the water pump 11, and then transported from the first clean water ditch 8 to the central drainage ditch 4 and finally flows into the second clean water ditch 24 through the horizontal water diversion pipe 15 and is directly discharged outside the tunnel; the sewage from the main tunnel face of this section is collected by the sewage mobile pump station 14 and then discharged to the sewage treatment device outside the drainage tunnel 2 through the sewage pipe 13 for treatment;

[0035] During construction, the first water pipe 5, the second water pipe 7, the transverse water pipe 15, and the third water pipe 12 can be constructed using reinforced concrete pipes or steel pipes with a diameter of 200 mm. After the tunnel is completed, the water tank 10 is backfilled with M10 mortared stone slabs, and the upper portion of the water tank 10 is constructed to meet the requirements of the remaining cable cavity length.

[0036] In summary, this drainage system not only ensures the timely drainage of accumulated water near the face of a reverse-slope tunnel, ensuring stable face conditions and reducing construction risks, but also achieves the separation of clean and dirty water from construction wastewater, minimizing contamination of clean water by sewage generated during tunnel construction. This effectively reduces the difficulty of tunnel construction wastewater treatment, the amount of sewage to be treated, and the cost of sewage treatment, effectively reducing the workload of the treatment system and the cost of tunnel construction. Furthermore, it features a clear pipeline layout, well-defined clean and dirty water diversion paths, and convenient on-site installation and management, making it particularly suitable for high-speed railway tunnel construction with high leakage and inflow volumes. Furthermore, by installing a water sump at the location of the traditional excess cable cavity to collect clean water within the transverse passage, tunnel construction wastewater and seepage behind the tunnel lining are diverted into a drainage ditch and discharged outside the tunnel. This not only ensures the safety of tunnel construction but also allows for backfilling after tunnel penetration, effectively reducing the difficulty and workload of tunnel construction.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A reverse slope tunnel construction drainage system, comprising a main tunnel (1), a drainage tunnel (2), and a surplus length cable cavity (3), characterized in that: A central drainage ditch (4) is provided in the center of the main tunnel (1). The end of the central drainage ditch (4) close to the main tunnel face is connected to the water inlet of the fixed clean water pump station (6) through a first water pipe (5). The water outlet of the fixed clean water pump station (6) is connected to the end of the central drainage ditch (4) located in the inlet area through a second water pipe (7). First clean water ditches (8) are provided on both sides of the main tunnel (1). The first clean water ditches (8) are connected to the central drainage ditch (4) through a connecting pipe (9). A water tank (10) is provided in the excess length cable cavity (3). A water pump (11) is provided in the water tank (10). The water pump (11) The water outlet of the pump (11) is connected to the central drainage ditch (4) through a third water delivery pipe (12). A sewage pipe (13) is provided on one side of the drainage hole (2). The water inlet of the sewage pipe (13) is connected to the water outlet of a sewage mobile pump station (14) provided in the construction area of ​​the main hole (1). The water outlet of the sewage pipe (13) is connected to a sewage treatment facility outside the drainage hole (2). A second clear water ditch (24) is provided on the other side of the drainage hole (2). The second clear water ditch (24) is connected to the central drainage ditch (4) through a transverse water diversion pipe (15). The water outlet of the second clear water ditch (24) is located outside the drainage hole (2).

2. The reverse slope tunnel construction drainage system according to claim 1, characterized in that: The main tunnel (1) and the drainage tunnel (2) are connected via a transverse channel (16), and the transverse water diversion pipe (15) is buried in the transverse channel (16).

3. The reverse slope tunnel construction drainage system according to claim 1, characterized in that: An I-steel (17) is erected on the top of the water tank (10), and wooden boards (18) are fully laid above the I-steel (17).

4. The reverse slope tunnel construction drainage system according to claim 3, characterized in that: The spacing between the I-beams (17) is 50 cm, and the thickness of the wooden board (18) is 3 cm.

5. The reverse slope tunnel construction drainage system according to claim 1, characterized in that: Water collection pits (19) are provided on both sides of the first clear water ditch (8).

6. The reverse slope tunnel construction drainage system according to claim 5, characterized in that: A cover plate (20) is provided above the first clear water ditch (8) and the sump (19).

7. The reverse slope tunnel construction drainage system according to claim 1, characterized in that: Sewage discharge ditches (21) are arranged side by side in the drainage hole (2) beside the second clear water ditch (24).

8. The reverse slope tunnel construction drainage system according to any one of claims 1 to 7, characterized in that: A sedimentation tank (22) is provided on one side of the water tank (10) close to the main hole (1). The sedimentation tank (22) is provided at a height higher than the water tank (10). The sedimentation tank (22) is connected to the water tank (10) through an overflow hole.

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