Tunnel construction sewage separation system

Abstract

The utility model relates to tunnel construction water treatment technical field discloses a kind of tunnel construction sewage separation system, including the middle drainage ditch and the side ditch of both sides being arranged in tunnel, and the face of tunnel and inverted arch are equipped with clean water collecting device and sewage collecting device, clean water collecting device is connected with clean water discharge device between the middle drainage ditch, sewage collecting device is connected with sewage discharge device between one side ditch or two side ditches. The utility model patent solves the problem of large sewage treatment capacity and high processing cost of tunnel drainage in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology in tunnel construction, specifically to a tunnel construction wastewater separation system. Background Technology

[0002] A large amount of water is generated during tunnel construction, mainly including: ① water from exploratory boreholes at the tunnel face, seepage from the initial supports, and water behind the waterproofing membrane in the completed section; ② water flowing from exploratory boreholes at the tunnel face and seepage from the initial supports due to repeated crushing by various heavy vehicles during slag removal and shotcreting; ③ water becoming turbid in the invert section due to construction work during invert excavation; and ④ turbid water generated from washing the tunnel surface or construction equipment. Currently, all water generated inside the tunnel flows out through tunnel side ditches or intermediate drainage ditches. To avoid environmental impact from drainage, multi-stage sedimentation tanks are usually set up outside the tunnel to treat the drainage through sedimentation. Only after the water quality meets the standards after sedimentation treatment can it be discharged.

[0003] While existing multi-stage sedimentation tanks can treat tunnel drainage water to meet discharge standards, the actual process involves large volumes of sedimentation treatment, long cycles, and high costs. Of the drainage water in the tunnel mentioned above, ① the exploratory water from the face-penetrating boreholes, the seepage from the initial support, and the water behind the waterproofing slab in the tunnel section are all clean water, while ②, ③, and ④ are wastewater. Sedimentation tanks primarily treat wastewater, but in practice, clean water and wastewater mix before flowing to the sedimentation tank for unified treatment. The clean water undergoes ineffective sedimentation, increasing the volume of sedimentation and raising costs. Therefore, the existing tunnel drainage structure can be improved to reduce wastewater volume and lower tunnel drainage treatment costs. Utility Model Content

[0004] The present invention aims to provide a sewage and wastewater separation system for tunnel construction, in order to solve the problems of large sewage treatment volume and high treatment cost in the prior art for tunnel drainage.

[0005] To solve the above problems, the present invention adopts the following technical solution: a tunnel construction sewage diversion system, including a central drainage ditch and two side ditches set in the tunnel, a clean water collection device and a sewage collection device are provided between the tunnel face and the invert arch, a clean water discharge device is connected between the clean water collection device and the central drainage ditch, and a sewage discharge device is connected between the sewage collection device and one or both side ditches.

[0006] The principles and beneficial effects of this application are as follows:

[0007] In this application, when collecting water from exploratory boreholes detected at the tunnel face, seepage from the initial support, and water behind the waterproofing slab in the tunnel section, the collected water is clean water, which is collected using a clean water collection device. When collecting water from other construction phases, the collected water is sewage, which is collected using a sewage collection device. Clean water collection and sewage collection are independent of each other and occur at different times during construction to avoid interference between them. After collection and drainage, the clean water collected by the clean water collection device is discharged to the central drainage ditch of the tunnel and then discharged outside the tunnel through the central drainage pipe. The sewage collected by the sewage collection device is discharged to one or both side ditches using a sewage discharge device and then discharged outside the tunnel through the side ditches.

[0008] Because it is equipped with a clean water discharge device and a sewage discharge device, the clean water and sewage are collected separately and discharged from the tunnel through the drainage ditch in the middle of the tunnel and the side ditch. This avoids the clean water from mixing with the sewage during the treatment process, effectively reducing the amount of sewage to be treated in the sedimentation tank outside the tunnel. By separating clean water and sewage, not only can the water treatment efficiency be improved, but the sewage treatment cost can also be effectively reduced.

[0009] Meanwhile, in this solution, when discharging clean water and sewage, the clean water is discharged through the central drainage pipe in the tunnel. The central drainage ditch is located in a relatively sealed space within the tunnel, preventing blockages during the clean water discharge process. No manual intervention is required, ensuring a stable and long-term discharge of clean water. Sewage typically contains large amounts of suspended solids such as rock powder, silt, and cement slurry, as well as petroleum pollutants. These suspended solids may settle during discharge; for example, rock powder and silt tend to accumulate in the side ditches. Since the side ditches are located in the open spaces on both sides of the tunnel, any sludge or sediment can be easily removed, effectively preventing blockages after prolonged sewage discharge. Therefore, the technical solution in this application effectively ensures a stable and long-term discharge of both clean water and sewage outside the tunnel.

[0010] Preferably, as an improvement, the clean water collection device includes a temporary water collection ditch and a collection box, which are located between the working face and the invert; the sewage collection device includes a sewage collection pit, which is located between the clean water collection device and the invert, and a temporary sewage pipe is detachably connected between the temporary water collection ditch and the sewage collection pit or side ditch, with a sewage switch installed on the temporary sewage pipe.

[0011] In this scheme, the clean water collection device includes a temporary water collection ditch and a collection box. Both the temporary water collection ditch and the collection box are set between the working face and the invert. The collection box is used to collect the exploratory water (a part of the clean water) from the advance exploratory borehole. The temporary water collection ditch is used not only to collect the base water and the surrounding rock fissure water, but also to collect the sewage during slag removal and grouting in the water-spraying area inside the tunnel. That is, the temporary water collection ditch is used not only for clean water collection, but also for sewage collection. When used for sewage collection, a temporary sewage pipe is detachably connected between the temporary water collection ditch and the sewage collection pit or side ditch. A sewage switch is installed on the temporary sewage pipe. When the sewage switch on the temporary sewage pipe is opened, the collected sewage can be discharged into the sewage collection pit or directly into the side ditch. The sewage discharged into the sewage collection pit can be discharged into the side ditch by the sewage discharge device, and then discharged out of the side ditch, so that the sewage can be discharged out of the tunnel through the side ditch.

[0012] In this scheme, as construction progresses, the position of the working face changes continuously. Therefore, it is necessary to constantly change the positions of the temporary collection ditch and the sewage collection pit. The temporary sewage pipe can be detachably connected between the temporary collection ditch and the sewage collection pit so that the position of the temporary sewage pipe can be readjusted after the positions of the sewage collection pit and the temporary collection ditch change, so that the sewage in the temporary collection ditch can be accurately collected into the sewage collection pit. In addition, the collection box is used to collect the exploratory water from the advance exploratory borehole. After the position of the working face changes, only the position of the collection box needs to be moved to accurately collect the exploratory water. The operation is convenient and the collection and receiving effect is stable.

[0013] Preferably, as an improvement, the clean water discharge device includes a clean water pipe and a probe water pipe. The clean water pipe is detachably connected between the intermediate drainage ditch and the temporary water collection ditch. A clean water switch is provided on the clean water pipe. The probe water pipe is connected between the advanced probe hole and the intermediate drainage ditch.

[0014] In this scheme, the exploratory water from the advance exploratory borehole is diverted to the intermediate drainage ditch using the exploratory water pipe, and the clean water collected in the temporary water collection ditch is diverted to the intermediate drainage ditch using the clean water pipe, so as to achieve centralized collection of clean water. At the same time, a clean water switch is installed on the clean water pipe, which is opened only when clean water is generated during the erection and excavation of the tunnel water-spraying area, and closed when sewage is generated during the slag removal and shotcreting of the water-spraying area, so as to prevent sewage from entering the intermediate drainage ditch and contaminating the clean water.

[0015] Preferably, as an improvement, the sewage discharge device includes a sewage suction pipe and a sewage pump connected to the sewage suction pipe, with one end of the sewage suction pipe located in a sewage collection pit and the other end connected to a side ditch.

[0016] In this solution, sewage collected in the sewage sump is pumped to the side ditch using a sewage pump and a sewage suction pipe, and then discharged out of the hole through the side ditch. The structure is simple and easy to install, and it can efficiently complete the sewage suction and discharge.

[0017] Preferably, the bottom wall of the temporary water collection ditch is inclined to one or both sides of the working face;

[0018] When the bottom wall of the temporary collection ditch is inclined to one side of the working face, both the temporary sewage pipe and the clean water pipe are connected to the lower end of the temporary collection ditch.

[0019] When the bottom wall of the temporary water collection ditch is inclined to both sides of the working face, the temporary sewage pipe and the clean water pipe are connected to both ends of the temporary water collection ditch.

[0020] In this scheme, the bottom wall of the temporary collection ditch is inclined to one or both sides of the working face (when the bottom wall of the temporary collection ditch is inclined to both sides of the working face, the middle position of the bottom wall of the temporary collection ditch is the high end). When sewage or clean water flows into the temporary collection ditch, it can automatically flow to the low end of the bottom wall, and then the collected clean water or sewage is discharged in time by the clean water pipe or temporary sewage pipe, so as to avoid a large amount of water stagnation in the temporary collection ditch and the resulting safety risks.

[0021] Preferably, as an improvement, the inclination angle of the bottom wall of the temporary water collection ditch is greater than or equal to 2°.

[0022] In this scheme, the inclination angle of the bottom wall of the temporary collection ditch is set to be greater than or equal to 2° to ensure that the clean water or sewage flowing into the temporary collection ditch can automatically gather at the lower end and be quickly discharged.

[0023] Preferably, as an improvement, the side ditch is provided with multiple water-blocking walls at intervals, the top of the water-blocking walls being lower than the top surface of the invert arch, and along the direction of the tunnel face outward, the multiple water-blocking walls divide the side ditch into multiple sedimentation tanks.

[0024] In this scheme, multiple water-blocking walls divide the side ditch into multiple sedimentation tanks, creating a stepped sedimentation process. When sewage flows from the end of the side ditch near the tunnel face to the outside of the tunnel, the sewage will flow through multiple sedimentation tanks in sequence. The suspended solids in the sewage will initially settle as they flow through the sedimentation tanks, reducing the silt content in the dedicated sedimentation tanks outside the tunnel, thereby reducing the cost of subsequent sewage sedimentation treatment. When the sludge and silt in the sedimentation tanks accumulate to a certain thickness, they can be easily removed manually.

[0025] Preferably, as an improvement, the distance between the top surface of the water-blocking wall and the top surface of the inverted arch is 10-15 cm.

[0026] Preferably, as an improvement, the distance between adjacent water-blocking walls is 50 to 100 meters.

[0027] In this design, the distance between the top surface of the water-blocking wall and the top surface of the invert arch is 10-15cm, and the distance between adjacent water-blocking walls is 50-100 meters. The water-blocking wall can effectively block the suspended solids in the sewage. The sedimentation tank has a suitable length to facilitate the sedimentation of suspended solids in the sewage. The height space between the top surface of the water-blocking wall and the top surface of the invert arch allows the sewage to flow out of the tunnel. The structure is simple, the sedimentation effect is good, and the sedimented sludge is easy to clean.

[0028] Preferably, as an improvement, the sewage discharge device is connected to two side ditches simultaneously, and a reversing valve is connected to the sewage discharge device. The reversing valve has two output ends, one of which is connected to one side ditch of the tunnel, and the other output end is connected to the other side ditch of the tunnel.

[0029] In this scheme, the sewage discharge device is connected to both side ditches of the tunnel simultaneously, allowing sewage to be discharged from both ditches. In actual use, the sewage discharge device is connected to a reversing valve with two output ends. During use, the reversing valve is used to switch the sewage discharge to one of the two side ditches. For example, the sewage is first pumped to the left side ditch and discharged out of the tunnel through the left side ditch. During the sewage discharge process, sludge gradually settles in the left side ditch. When the sludge reaches a certain thickness, the reversing valve can be used to pump the sewage to the right side ditch and discharge the sewage through the right side ditch. Discharge from the left side ditch is suspended. At this time, the sludge in the left side ditch can be cleaned manually so that sewage can be discharged through the left side ditch again later. The alternating discharge of sewage from the left and right side ditches not only does not affect the sewage discharge, but also allows for the regular cleaning of sludge in the ditches, preventing the sewage discharge process from being blocked by the accumulation of sludge. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a clean water collection device and a sewage collection device in Embodiment 1 of this utility model (wherein the clean water collection device shows a collection method with a probe water pipe).

[0031] Figure 2 This is a schematic diagram of a clean water collection device and a sewage collection device in Embodiment 1 of this utility model (wherein the clean water collection device shows a collection method with a temporary water collection ditch and a clean water pipe).

[0032] Figure 3 This is a schematic diagram of a sewage collection device in Embodiment 1 of the present invention (the sewage collection device shows a collection method with a temporary collection ditch and sewage pipe).

[0033] Figure 4 This is a schematic diagram of a water-blocking wall installed in the side ditch in Embodiment 1 of this utility model.

[0034] Figure 5This is a schematic diagram of the clean water collection device and the sewage collection device in Embodiment 2 of this utility model. Detailed Implementation

[0035] The following detailed description illustrates the specific implementation method:

[0036] The reference numerals in the accompanying drawings include: 1. Intermediate drainage ditch; 2. Side ditch; 3. Working face; 4. Invert arch; 5. Temporary collection ditch; 6. Collection box; 7. Advance exploration hole; 8. Sewage collection pit; 9. Temporary sewage pipe; 10. Sewage switch; 11. Clean water pipe; 12. Exploration hole water pipe; 13. Clean water switch; 14. Sewage suction pipe; 15. Sewage pump; 16. Water barrier wall; 17. Reversing valve.

[0037] Example 1

[0038] This embodiment is as shown in the attached figure. Figure 1 As shown: A tunnel construction sewage diversion system includes a central drainage ditch 1 and two side ditches 2 installed in the tunnel. A clean water collection device and a sewage collection device are installed between the tunnel face 3 and the invert 4. The clean water collection device is connected to the central drainage ditch 1 by a clean water discharge device. The sewage collection device is connected to one or both side ditches 2 by a sewage discharge device. In this embodiment, the sewage collection device is connected to one of the side ditches 2 by a sewage discharge device.

[0039] Combination Figure 1 and Figure 2 In this embodiment, the clean water collection device includes a temporary water collection ditch 5 and a collection box 6. Both the temporary water collection ditch 5 and the collection box 6 are located between the tunnel face 3 and the invert 4. The temporary water collection ditch 5 can be used to collect water from the foundation and fissure water in the surrounding rock (the collected water is clean water), and also to collect wastewater from slag removal and shotcreting in the water-spraying area inside the tunnel (the collected water is wastewater). The collection box 6 is used to collect the exploratory water from the advance exploratory borehole 7 (the exploratory water is clean water). The wastewater collection device includes a wastewater collection pit 8, which is located between the temporary water collection ditch 5 and the invert 4. To avoid the wastewater collection pit 8 interfering with the construction of the tunnel face 3 and the invert 4, in this embodiment, there are two wastewater collection pits 8, and the two wastewater collection pits 8 are located on the left and right sides of the tunnel. In addition, combined with Figure 3 A temporary sewage pipe 9 is detachably connected between the temporary collection ditch 5 and the sewage collection pit 8 or the side ditch 2. A sewage switch 10 is installed on the temporary sewage pipe 9, allowing sewage collected by the temporary collection ditch 5 to be discharged into the sewage collection pit 8 through the temporary sewage pipe 9, or directly into the side ditch 2. This embodiment uses direct discharge into the side ditch 2 as an example. Simultaneously, the sewage collection pit 8 is also used to collect sewage generated during slag removal and shotcreting in the water-spraying area inside the tunnel, as well as sewage generated during construction operations during the excavation of the invert arch 4, and sewage generated from washing the road surface or construction equipment inside the tunnel.

[0040] Combination Figure 1 and Figure 2 The clean water discharge device includes a clean water pipe 11 and a probe water pipe 12. The clean water pipe 11 is detachably connected between the intermediate drainage ditch 1 and the temporary water collection ditch 5. A clean water switch 13 is connected to the clean water pipe 11. The probe water pipe 12 is connected between the advanced probe hole 7 and the intermediate drainage ditch 1. Since the height of the advanced probe hole 7 and the height of the temporary water collection ditch 5 are both higher than those of the intermediate drainage ditch 1 and the side ditch 2, the clean water collected in the temporary water collection ditch 5 can automatically flow into the intermediate drainage ditch 1 through the clean water pipe 11, and the probe water generated by the advanced probe hole 7 can also automatically flow into the intermediate drainage ditch 1 through the probe water pipe 12. The sewage discharge device in this embodiment includes a sewage suction pipe 14 and a sewage pump 15 connected to the sewage suction pipe 14. One end of the sewage suction pipe 14 is located in the sewage collection pit 8 and the other end is connected to the side ditch 2. As can be seen from the above, there are two sewage collection pits 8 in this embodiment. In order to facilitate sewage discharge, each sewage collection pit 8 is equipped with a sewage pump 15 and a sewage suction pipe 14.

[0041] Combination Figure 1 and Figure 2 To facilitate the rapid and timely collection and drainage of water (including clean water and sewage) in the temporary collection ditch 5, in this embodiment, the bottom wall of the temporary collection ditch 5 is inclined towards one or both sides of the working face 3. When sewage or clean water is collected in the temporary collection ditch 5, the clean water or sewage can quickly flow to the lower end of the temporary collection ditch 5 and then be quickly drained away by the clean water pipe 11 or the temporary sewage pipe 9. Specifically, this embodiment uses the inclination of the bottom wall of the temporary collection ditch 5 towards both sides of the working face 3 as an example. Correspondingly, clean water pipe 11 and temporary sewage pipe 9 need to be connected to the lower ends of both ends of the temporary collection ditch 5 (in use, only one of the clean water pipe 11 and the temporary sewage pipe 9 is kept connected to the lower end of the temporary collection ditch 5), which can also achieve the collection and diversion of sewage and clean water. At the same time, in order to drain the temporary collection ditch 5 more efficiently, in this embodiment, the inclination angle θ of the bottom wall of the temporary collection ditch 5 is set to be greater than or equal to 2°, preferably 3°, and a funnel-shaped diverter is installed at the lower end of the temporary collection ditch 5.

[0042] Combination Figure 1 and Figure 4In this embodiment, multiple water-blocking walls 16 are spaced apart on the side ditch 2. The water-blocking walls 16 are made of brick masonry. The top of the water-blocking wall 16 is lower than the top surface of the inverted arch 4, and the distance D between the top surface of the water-blocking wall 16 and the top surface of the inverted arch 4 is 10-15cm, preferably 12cm. The distance between adjacent water-blocking walls 16 is 50-100 meters, preferably 80 meters. The multiple water-blocking walls 16 divide the side ditch 2 into multiple sedimentation tanks. When sewage flows through the multiple sedimentation tanks in sequence, the suspended solids in the sewage settle into the sedimentation tanks. The sedimentation tanks are used to perform preliminary sedimentation of the sewage, which effectively improves the efficiency of sewage sedimentation treatment outside the tunnel and reduces the sedimentation treatment cost.

[0043] The specific implementation process is as follows:

[0044] Using the technical solution in this embodiment, sewage and clean water within the tunnel can be collected and discharged separately. Specifically, when collecting and discharging clean water from the tunnel, firstly, as follows... Figure 1 As shown, the water flowing out of the pilot borehole 7 is collected by the collection tank 6, and then discharged into the intermediate drainage ditch 1 by the borehole water pipe 12 connected to the collection tank 6. Figure 2 As shown, the seepage water from the initial branch and the clear water behind the waterproofing slab of the tunnel section flow into the temporary water collection ditch 5, and then automatically flow to the lower end along the temporary water collection ditch 5. When the clear water switch 13 is turned on, the water flows into the clear water pipe 11 under the guidance of the flow guide, and then flows from the clear water pipe 11 to the intermediate drainage ditch 1. The clear water flowing into the intermediate drainage ditch 1 is discharged out of the tunnel along the intermediate drainage ditch 1.

[0045] When collecting and discharging sewage from inside the tunnel, such as Figure 3 As shown, first turn off Figure 2 The clean water switch 13 in the tunnel allows wastewater generated during slag removal and shotcreting in the tunnel's water-spraying area to be collected by the temporary collection ditch 5. Opening the wastewater switch 10 allows the wastewater collected in the temporary collection ditch 5 to be directly discharged into the side ditch 2. Simultaneously, combined with... Figure 1 During the excavation of the invert arch 4, wastewater generated from the construction work on the invert arch 4 section, as well as wastewater from washing the road surface or construction equipment inside the tunnel, all flow into the wastewater collection pit 8. Then, the wastewater pump 15 is started, and the wastewater in the wastewater collection pit 8 is pumped into the side ditch 2 through the suction pipe 14. The wastewater flows out of the tunnel from the side ditch 2. At the same time, as the wastewater flows along the suction pipe 14, the suspended solids in the wastewater gradually settle under the obstruction and sedimentation effect of the water-blocking wall 16. The wastewater flows from the top of the water-blocking wall 16 to the next sedimentation tank, which plays a preliminary sedimentation role.

[0046] In this embodiment, by setting up a clean water collection device and a sewage collection device to collect and discharge clean water and sewage in the tunnel separately, the amount of sewage during tunnel construction is effectively reduced. This not only improves the efficiency of sewage treatment outside the tunnel, but also saves on sewage treatment costs.

[0047] Example 2

[0048] The difference between Example 2 and Example 1 is as follows: Figure 5 As shown, in this embodiment, the sewage discharge device is connected to both side ditches 2 of the tunnel simultaneously, and the sewage discharge device is connected to a reversing valve 17 with two output ends. Since there are two sewage collection pits 8 in Embodiment 1, and two sewage discharge devices are set accordingly, the sewage pumps 15 in the two sewage discharge devices in this embodiment are simultaneously connected to the input end of the reversing valve 17. One output end of the reversing valve 17 is connected to one side ditch 2 of the tunnel through a water pipe, and the other output end of the reversing valve 17 is connected to the other side ditch 2 through a water pipe.

[0049] In this embodiment, both side ditches 2 inside the tunnel are used to discharge sewage. During the discharge process, the reversing valve 17 can be used to control the sewage flow to one of the side ditches 2, so that one side ditches 2 is in the sewage discharge state while the other side ditches 2 is not draining. Since both side ditches 2 are equipped with water-blocking walls 16, the sedimentation tank formed by the water-blocking walls 16 and the side ditches 2 can allow the suspended solids in the sewage to settle initially. Therefore, after a period of use, a certain thickness of sludge will accumulate in the sedimentation tank of one side ditches 2. At this time, the reversing valve 17 can be used to control the sewage to be discharged out of the tunnel through the other side ditches 2, which makes it convenient for manual removal of the sludge in the sedimentation tank. The two side ditches 2 are used alternately. Under the premise of ensuring efficient sewage discharge, the sludge in the sedimentation tank can also be removed periodically, which effectively ensures the stability of sewage discharge.

[0050] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A tunnel construction wastewater separation system, comprising a central drainage ditch and side ditches installed within the tunnel, characterized in that: The tunnel face and the invert are equipped with a clean water collection device and a sewage collection device. The clean water collection device is connected to the intermediate drainage ditch with a clean water discharge device, and the sewage collection device is connected to one or both side ditches with a sewage discharge device.

2. The tunnel construction wastewater separation system according to claim 1, characterized in that: The clean water collection device includes a temporary water collection ditch and a collection box, which are located between the working face and the invert. The sewage collection device includes a sewage collection pit, which is located between the clean water collection device and the invert. A temporary sewage pipe is detachably connected between the temporary water collection ditch and the sewage collection pit or side ditch, and a sewage switch is installed on the temporary sewage pipe.

3. A tunnel construction wastewater separation system according to claim 2, characterized in that: The clean water discharge device includes a clean water pipe and a probe water pipe. The clean water pipe is detachably connected between the intermediate drainage ditch and the temporary water collection ditch. A clean water switch is provided on the clean water pipe. The probe water pipe is connected between the advanced probe hole and the intermediate drainage ditch.

4. A tunnel construction wastewater separation system according to claim 3, characterized in that: The sewage discharge device includes a sewage suction pipe and a sewage pump connected to the sewage suction pipe. One end of the sewage suction pipe is located in the sewage collection pit, and the other end is connected to the side ditch.

5. A tunnel construction wastewater separation system according to claim 4, characterized in that: The bottom wall of the temporary water collection ditch is inclined to one or both sides of the working face; When the bottom wall of the temporary collection ditch is inclined to one side of the working face, both the temporary sewage pipe and the clean water pipe are connected to the lower end of the temporary collection ditch. When the bottom wall of the temporary water collection ditch is inclined to both sides of the working face, the temporary sewage pipe and the clean water pipe are connected to both ends of the temporary water collection ditch.

6. A tunnel construction wastewater separation system according to claim 2, characterized in that: The inclination angle of the bottom wall of the temporary water collection ditch is greater than or equal to 2°.

7. A tunnel construction wastewater separation system according to claim 2, characterized in that: Multiple water-blocking walls are spaced apart on the side ditch. The top of the water-blocking walls is lower than the top surface of the invert arch. Along the direction of the tunnel face outward, the multiple water-blocking walls divide the side ditch into multiple sedimentation tanks.

8. A tunnel construction wastewater separation system according to claim 7, characterized in that: The distance between the top surface of the water-blocking wall and the top surface of the inverted arch is 10-15 cm.

9. A tunnel construction wastewater separation system according to claim 8, characterized in that: The distance between adjacent water-blocking walls is 50 to 100 meters.

10. A tunnel construction wastewater separation system according to claim 4, characterized in that: The sewage discharge device is connected to two side ditches at the same time, and a reversing valve is connected to the sewage discharge device. The reversing valve has two output ends. One output end of the reversing valve is connected to one side ditch of the tunnel, and the other output end is connected to the other side ditch of the tunnel.

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