Water-rich stratum tunnel construction sewage separation and drainage structure and method

Abstract

The application relates to the field of tunnel construction and discloses a water-rich stratum tunnel construction sewage separation and drainage structure, which comprises a clean water tank and a sewage tank, which are used for collecting clean water and sewage at a tunnel face respectively; an initial support section ring blind pipe, which is used for collecting initial support section seepage water and draining the clean water to the clean water tank; a drainage pipe, which is used for conveying water in the clean water tank and the sewage tank; a secondary lining construction section temporary drainage ditch, wherein a clean sewage separation partition plate is arranged in the secondary lining construction section temporary drainage ditch, and a movable sealing plate is arranged at a water inlet end of the clean sewage separation partition plate; a secondary lining forming section drainage ditch, wherein a side ditch partition wall is arranged in the secondary lining forming section drainage ditch; a sand settling tank, which is used for receiving clean water; and a sewage treatment plant sedimentation tank, which is located outside the tunnel and is used for receiving sewage discharged from the secondary lining forming section drainage ditch and performing sewage treatment. The application can collect and discharge water at each construction section in the tunnel construction process, and can separately discharge clean water and sewage at different construction time periods of the tunnel face.

Description

Technical Field

[0001] This application relates to the field of tunnel construction, and more particularly to a structure and method for separating clean water and sewage during tunnel construction in water-rich strata. Background Technology

[0002] During tunnel construction, depending on the hydrogeological conditions of the project, it is inevitable to encounter moderately or slightly water-rich areas in bedrock fissures during tunnel excavation. Because the tunnel water inflow is significant in these areas, treating all of it as wastewater would increase the operational load on wastewater treatment facilities, raise treatment costs, and easily lead to localized environmental pollution incidents and disputes. Therefore, it is necessary to separate clean and wastewater during tunnel construction in water-rich strata to reduce the generation of tunnel construction wastewater at its source and minimize its impact on the water environment.

[0003] However, in the process of implementing the relevant technical solutions, at least the following technical problems were found: Tunnel construction generally divides the tunnel into multiple construction sections, from the tunnel excavation face to the tunnel entrance, including the working face, the initial support section, the invert section, the secondary lining section, etc. The different construction sections will make the clean water and sewage separation system somewhat limited, the treatment methods for clean water and sewage in the tunnel are relatively simple, and they cannot effectively treat and respond quickly. The tunnel cannot be constructed by using the form of waterless operation in the invert section. Summary of the Invention

[0004] This application provides a drainage structure for separating clean water and wastewater during tunnel construction in water-rich strata, which solves the technical problem that existing technologies cannot achieve waterless operation through the invert section during tunnel construction. It enables the collection and discharge of water from each construction section during tunnel construction, and separates the clean water and wastewater from different construction periods at the tunnel face, thereby reducing the generation of tunnel construction wastewater from the source and reducing the impact on the surrounding water environment.

[0005] This application provides a drainage structure for separating clean water and sewage during tunnel construction in water-rich strata, comprising: a clean water tank and a sewage tank, located on both sides of the initial support section tunnel, respectively, for collecting clean water and sewage at the tunnel face; a circumferential blind pipe for the initial support section, installed on the walls on both sides of the initial support section tunnel, for collecting seepage water in the initial support section and diverting clean water to the clean water tank; drainage pipes installed on the walls on both sides of the tunnel, for transporting water from the clean water tank and the sewage tank; and a temporary drainage ditch for the secondary lining construction section, installed on both sides of the secondary lining construction section tunnel, the drainage pipes connecting the water tank and the temporary drainage ditch for the secondary lining construction section, the temporary drainage ditch for the secondary lining construction section for receiving clean and sewage pumped from the clean water tank and the sewage tank, and for receiving seepage water from the walls of the initial support section tunnel and underground seepage water from the invert section, the temporary drainage ditch for the secondary lining construction section including... The tunnel consists of a front ditch section and a rear ditch section. The rear ditch section is equipped with a clear water ditches and a sewage ditches on either side of the clear water ditches. A movable sealing plate is installed at the water inlet end of the clear water ditches to block the water flow on one side of the clear water ditches. A secondary lining forming section drainage ditch is located on both sides of the secondary lining forming section. Side ditch partitions are installed within the secondary lining forming section drainage ditch, with clear water ditches and sewage ditches on either side of the side ditch partitions. The side ditch partitions are connected to the clear water ditches and sewage ditches. After tunnel construction is completed, the secondary lining forming section drainage ditch is used for routine tunnel drainage. A sedimentation tank is located outside the tunnel to receive the clear water discharged from the secondary lining forming section drainage ditch. A sewage treatment plant sedimentation tank is located outside the tunnel to receive and treat the sewage discharged from the secondary lining forming section drainage ditch.

[0006] Furthermore, the ditch formed between the clean water diversion partition and the tunnel wall is a clean water ditch, and the other side of the clean water diversion partition is a sewage ditch; the ditch formed between the side ditch partition and the tunnel wall is a clean water ditch, and the other side of the side ditch partition is a sewage ditch.

[0007] Furthermore, I-beams are placed in both the temporary drainage ditch of the secondary lining construction section and the drainage ditch of the secondary lining forming section, and steel plates are laid on the I-beams, with the steel plates flush with the ground.

[0008] Furthermore, the middle of the side ditch partition wall is grouted with mortar, and the sides are coated with cement-based crystalline coating.

[0009] Furthermore, a temporary drainage ditch is excavated at the tunnel face, and the temporary drainage ditch is interconnected with the clean water tank and the sewage tank through buried steel pipes.

[0010] Furthermore, water pipes used to drain underground seepage water from the invert arch section are fixed to the invert arch trestle.

[0011] Furthermore, a mobile water tank, a waterproof board, and a suspended water trough are installed on the wall of the initial support section of the tunnel, all of which are used to collect scattered clean water from the initial support section of the tunnel and divert it to the clean water tank.

[0012] This application also provides a method for separating clean water and wastewater during tunnel construction in water-rich strata. The drainage method includes: using temporary drainage ditches at the tunnel face to divert clean water and wastewater generated at different times during tunnel operations; using circumferential blind pipes in the initial support section to divert clean water seeping from the walls of the initial support section to a clean water tank; using buried steel pipes to divert clean water and wastewater discharged from the tunnel face to clean water tanks and wastewater tanks on both sides of the initial support section of the tunnel, respectively; using water pumps to transport water from the clean water tanks and wastewater tanks through drainage pipes to temporary drainage ditches on both sides of the secondary lining construction section of the tunnel; and the temporary drainage ditches in the secondary lining construction section receive... The clean water and sewage pumped from the clean water tank and sewage tank, as well as the seepage water from the tunnel walls of the initial support section and the underground seepage water from the invert section, are diverted separately by the clean water and sewage diversion baffles in the temporary drainage ditch of the secondary lining construction section; the clean water and sewage in the temporary drainage ditch of the secondary lining construction section are diverted to the drainage ditch of the secondary lining forming section; the clean water in the drainage ditch of the secondary lining forming section is diverted to the sedimentation tank outside the tunnel by the clean water ditch; the sewage in the drainage ditch of the secondary lining forming section is diverted to the sedimentation tank of the sewage treatment plant outside the tunnel for sewage treatment; the clean water obtained after sewage treatment is discharged to the local drainage system or reused.

[0013] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0014] Because drainage ditches were dug in both the secondary lining construction section and the secondary lining forming section, sewage and clean water can be diverted and discharged separately. When the amount of sewage is large during the tunnel face construction, the clean water tank can be used for sewage collection. At this time, the clean water ditch in the rear ditch section can be blocked by a movable sealing plate, and the sewage generated during the tunnel face construction can be discharged into the sewage ditch. The water in the tunnel invert section can also be diverted and discharged through the temporary drainage ditch in the secondary lining construction section, realizing the form of waterless operation in the invert section for tunnel construction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a wastewater separation and drainage structure for tunnel construction in water-rich strata, as described in an embodiment of this application.

[0016] Figure 2 This is a schematic cross-sectional view of the initial support section of the tunnel in an embodiment of this application;

[0017] Figure 3 This is a schematic cross-sectional view of the tunnel invert section in an embodiment of this application;

[0018] Figure 4 This is a schematic diagram of the drainage structure of the temporary drainage ditch in the secondary lining construction section and the drainage ditch in the secondary lining forming section in the embodiments of this application;

[0019] Figure 5 This is a schematic cross-sectional view of the secondary lining construction section in an embodiment of this application;

[0020] Figure 6 This is a schematic cross-sectional view of the secondary lining forming section in an embodiment of this application;

[0021] Figure 7 This is a flowchart illustrating a method for separating clean water from sewage during tunnel construction in water-rich strata, as described in an embodiment of this application. Detailed Implementation

[0022] To better understand the technical solution of this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This application provides a drainage structure for separating clean water and sewage during tunnel construction in water-rich strata. The drainage structure includes a clean water tank, a sewage tank, a circumferential blind pipe in the initial support section, a drainage pipe, a temporary drainage ditch in the secondary lining construction section, a drainage ditch in the secondary lining forming section, a sedimentation tank, and a sedimentation tank in a sewage treatment plant.

[0024] Reference Figure 1 and Figure 2 As shown, the clean water tank and the sewage tank can be installed on both sides of the initial support section of the tunnel. Both tanks can accommodate water pumps. The design of the clean water tank and sewage tank can be based on the maximum inflow at the tunnel face and the pumping capacity of the water pumps. A temporary drainage ditch is excavated at the tunnel face. The clean water tank and the temporary drainage ditch are connected by a buried steel pipe, which can be 60cm in diameter. The sewage tank is connected to the temporary drainage ditch by another buried steel pipe. During slag removal and shotcreting operations at the tunnel face, the sewage generated during construction is diverted through the temporary drainage ditch to the buried steel pipe, which then transports the sewage to the sewage tank. During other tunnel face operations, clean water is collected and stored in the clean water tank.

[0025] Reference Figure 1 and Figure 3 As shown, the circumferential blind pipe of the initial support section is buried in the wall of the initial support section tunnel to collect seepage water on the tunnel wall. A longitudinal drainage pipe and an initial support drainage pipe are connected between the circumferential blind pipe of the initial support section and the clean water tank. The longitudinal drainage pipe can connect several circumferential blind pipes of the initial support section on the tunnel wall. Then, the clean water in the longitudinal drainage pipe is drained into the clean water tank through the initial support drainage pipe. Steel pipes, PVC pipes, or drainage hoses can be installed as longitudinal drainage pipes and initial support drainage pipes. In addition, mobile water tanks, waterproof boards, and hanging water tanks can be installed at the initial support section wall of the tunnel to collect scattered clean water in the initial support section of the tunnel and drain it into the clean water tank.

[0026] Reference Figure 1 As shown, there are two drainage pipes, which are fixed to the walls on both sides of the tunnel. The drainage pipes are composed of multiple short pipes and will move along with the tunnel construction.

[0027] Reference Figure 1 As shown, temporary drainage ditches for the secondary lining construction section are excavated along the sides of the tunnel. Temporary drainage ditches for the secondary lining construction section are excavated on both sides of the tunnel. A drainage pipe on one side of the tunnel connects a clean water tank on the same side to the temporary drainage ditch for the secondary lining construction section, while a drainage pipe on the other side connects a sewage tank on the other side to the temporary drainage ditch for the secondary lining construction section. Using pumps in the clean water and sewage tanks, clean and sewage water can be transported to the temporary drainage ditches for the secondary lining construction section on both sides, respectively. Water seepage from the tunnel wall in the initial support section and groundwater seepage in the invert section can be diverted to the temporary drainage ditches for the secondary lining construction section on both sides of the tunnel. The water pipe used to divert groundwater seepage in the invert section can be fixed to the invert trestle.

[0028] Continue to refer to Figure 1 , Figure 4 as well as Figure 5 As shown, the temporary drainage ditch in the secondary lining construction section includes a front ditch section and a rear ditch section. The rear ditch section is equipped with a clean water diversion baffle. On either side of the baffle are a clean water ditch and a sewage ditch, respectively. The clean water ditch is located on one side between the baffle and the tunnel wall, and the sewage ditch is on the other side. The sewage ditch is positioned closer to the tunnel surface to facilitate the flow of sewage from the road surface into it. A movable sealing plate is installed at the inlet end of the baffle to block the water flow on one side. When the amount of sewage is large during tunnel face construction, a clean water tank can be used for sewage collection. In this case, the movable sealing plate can be used to block the clean water ditch in the rear ditch section, allowing the sewage generated during tunnel face construction to be discharged into the sewage ditch.

[0029] Reference Figure 1 , Figure 4 as well as Figure 6 As shown, the drainage ditch of the secondary lining forming section is excavated on the side of the tunnel. The secondary lining forming section drainage ditch is excavated on both sides of the tunnel during the secondary lining construction section. Side ditch partition walls are set in the secondary lining forming section drainage ditch. The middle of the side ditch partition wall is grouted with mortar, and the sides are coated with cement-based crystalline coating. The two sides of the side ditch partition wall are the clean water ditch and the sewage ditch, respectively. The side ditch partition wall is connected to the clean water and sewage diversion partition. After the tunnel construction is completed, the secondary lining forming section drainage ditch can be used for the regular drainage of the tunnel.

[0030] Reference Figure 5 and Figure 6As shown, I-beams can be placed in both the temporary drainage ditch of the secondary lining construction section and the drainage ditch of the secondary lining forming section, and steel plates are laid on the I-beams. The steel plates are flush with the ground, which can increase the passing width of passing vehicles, ensure the safety of personnel passage, and prevent debris from falling.

[0031] Reference Figure 1 As shown, the sedimentation tank, located outside the tunnel, receives clean water discharged from the drainage ditch of the secondary lining forming section. After sedimentation in the sedimentation tank, the clean water can be directly discharged into the river or used for tunnel construction. The wastewater treatment plant sedimentation tank, also located outside the tunnel, receives and treats wastewater discharged from the drainage ditch of the secondary lining forming section. The treated water from both the sedimentation tank and the wastewater treatment plant sedimentation tank can be harmlessly discharged into the local drainage system where the construction site is located.

[0032] This application also provides a method for separating clean and wastewater drainage during tunnel construction in water-rich strata, referring to... Figure 7 As shown, the drainage methods include:

[0033] S11 collects clean water and wastewater from different construction sections of the working face.

[0034] The working face is used to divert clean water and wastewater generated at different times of operation.

[0035] S12, circumferential blind pipe drains clear water from the wall of the initial branch section.

[0036] The circumferential blind pipes buried in the initial support section wall can divert seepage water from the tunnel wall.

[0037] S2 directs clean water and wastewater to the clean water tank and wastewater tank respectively.

[0038] The clean water and sewage generated during the construction face are diverted to clean water tanks and sewage tanks on both sides of the initial support section of the tunnel by using buried steel pipes. The clean water tanks also receive clean water from the circumferential blind pipes.

[0039] S3, the water from the clean water tank and the sewage tank is pumped into the temporary drainage ditch of the secondary lining construction section.

[0040] Water is pumped from the clean water tank and the sewage tank through drainage pipes installed on the tunnel wall to the temporary drainage ditches on both sides of the secondary lining construction section of the tunnel.

[0041] S4, the clean water ditch and sewage ditch on both sides of the clean water and sewage diversion partition respectively guide the discharge of clean water and sewage.

[0042] The temporary drainage ditches in the secondary lining construction section are equipped with clean water diversion barriers and movable sealing plates. When the amount of construction wastewater at the tunnel face is large, the clean water tank on the other side of the tunnel can also be used as a wastewater tank, and the temporary drainage ditches in the secondary lining construction section on both sides of the tunnel can be used for wastewater discharge. The sealing plates in the temporary drainage ditches in the secondary lining construction section are removed, and the ditches on both sides of the clean water diversion barriers are used as wastewater ditches, which can accelerate the discharge of wastewater. When the amount of construction wastewater at the tunnel face is small, the inlet end of the clean water diversion barriers is sealed with movable sealing plates, with one side serving as a clean water ditch and the other side as a wastewater ditch. The clean water ditch in the temporary drainage ditches in the secondary lining construction section connected to the clean water tank is used to drain the clean water in the clean water tank, while the wastewater ditch can be used to receive tunnel pavement flushing water. The wastewater ditch in the temporary drainage ditches in the secondary lining construction section connected to the wastewater tank is used to drain the wastewater in the wastewater tank, while the clean water ditch can be used to receive tunnel wall seepage or ground seepage.

[0043] S5, clean water and sewage from the temporary drainage ditch of the secondary lining construction section are diverted to the drainage ditch of the secondary lining forming section.

[0044] The scouring water on the tunnel surface of the secondary lining section can be discharged into the sewage ditch in the drainage ditch of the secondary lining section.

[0045] S61, the drainage ditch of the secondary lining forming section discharges clean water into the sedimentation tank.

[0046] S62, the secondary lining formed drainage ditch discharges sewage to the sedimentation tank of the treatment plant.

[0047] S7, the treated clean water is discharged into the local drainage system or reused.

[0048] The aforementioned drainage structure and method for separating clean and dirty water during tunnel construction in water-rich strata allows for the separate drainage of wastewater and clean water generated at different stages of tunnel construction. When the volume of wastewater is large during tunnel face construction, a clean water tank can be used for wastewater collection, which accelerates the discharge of wastewater from the tunnel. Water in the tunnel invert section can also be drained through the temporary drainage ditch in the secondary lining construction section, enabling waterless tunnel construction in the invert section. In addition, I-beams can be placed in both the temporary drainage ditch in the secondary lining construction section and the drainage ditch in the secondary lining forming section, increasing the passing width for vehicles, ensuring the safety of personnel passage, and preventing debris from falling.

[0049] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0050] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present application, based on the technical solution and concept of the present application, should be covered within the scope of protection of the present application.

Claims

1. A drainage structure for separating clean water and sewage during tunnel construction in water-rich strata, characterized in that, include: The clean water tank and the sewage tank are located on both sides of the initial support section of the tunnel, and are used to collect clean water and sewage at the tunnel face, respectively. The initial support section circumferential blind pipe is installed on the wall of the initial support section tunnel to collect seepage water in the initial support section and divert the clean water to the clean water tank; Drainage pipes are installed on the walls on both sides of the tunnel to transport water from the clean water tank and the sewage tank; Temporary drainage ditches for the secondary lining construction section are set on both sides of the tunnel in the secondary lining construction section. The drainage pipes are connected to the water tank and the temporary drainage ditches for the secondary lining construction section. The temporary drainage ditches for the secondary lining construction section are used to receive clean and sewage pumped from the clean water tank and the sewage tank, as well as to receive seepage water from the tunnel wall in the initial support section and ground seepage water in the invert section. The temporary drainage ditches for the secondary lining construction section include a front ditch section and a rear ditch section. The rear ditch section is equipped with a clean and sewage diversion baffle. The two sides of the clean and sewage diversion baffle are a clean water ditch and a sewage ditch, respectively. A movable sealing plate is set at the water inlet end of the clean and sewage diversion baffle. The movable sealing plate is used to block the water flow on one side of the clean and sewage diversion baffle. The drainage ditch of the secondary lining forming section is set on both sides of the secondary lining forming section. Side ditch partition walls are set in the drainage ditch of the secondary lining forming section. The side ditch partition walls are respectively a clean water ditch and a sewage ditch. The side ditch partition walls are connected to the clean water and sewage diversion partition. The drainage ditch of the secondary lining forming section is used for the regular drainage of the tunnel after the tunnel construction is completed. The sedimentation basin, located outside the tunnel, is used to receive clean water discharged from the drainage ditch of the secondary lining forming section; The sedimentation tank of the sewage treatment plant is located outside the tunnel and is used to receive and treat sewage discharged from the drainage ditch of the secondary lining forming section.

2. The drainage structure for separating clean water and sewage during tunnel construction in water-rich strata as described in claim 1, characterized in that, The ditch formed between the clean water diversion partition and the tunnel wall is a clean water ditch, and the other side of the clean water diversion partition is a sewage ditch; the ditch formed between the side ditch partition wall and the tunnel wall is a clean water ditch, and the other side of the side ditch partition wall is a sewage ditch.

3. The drainage structure for separating clean water and sewage during tunnel construction in water-rich strata as described in claim 1, characterized in that, I-beams are placed in both the temporary drainage ditch of the secondary lining construction section and the drainage ditch of the secondary lining forming section, and steel plates are laid on the I-beams, with the steel plates flush with the ground.

4. The drainage structure for separating clean water and sewage during tunnel construction in water-rich strata as described in claim 1, characterized in that, The middle of the side ditch partition wall is grouted with mortar, and the sides are coated with cement-based crystalline coating.

5. The drainage structure for separating clean water and sewage during tunnel construction in water-rich strata as described in claim 1, characterized in that, A temporary drainage ditch is excavated at the tunnel face, and the temporary drainage ditch is connected to the clean water tank and the sewage tank by buried steel pipes.

6. The drainage structure for separating clean water and sewage during tunnel construction in water-rich strata as described in claim 1, characterized in that, Water pipes used to drain underground seepage water from the invert arch section are fixed on the invert arch trestle.

7. A drainage structure for separating clean water and sewage during tunnel construction in water-rich strata as described in claim 1, characterized in that, A mobile water tank, a waterproof board, and a suspended water trough are installed on the wall of the initial support section of the tunnel. These are used to collect scattered clean water from the initial support section of the tunnel and divert it to the clean water tank.

8. A method for separating clean water and wastewater during tunnel construction in water-rich strata, characterized in that, Employing the drainage structure as described in any one of claims 1-7, the drainage method includes: The working face is used to divert clean water and wastewater generated at different times of operation. The clear water seeping from the wall of the initial support section is diverted to the clear water tank using the circumferential blind pipe of the initial support section. The clean water and sewage discharged from the tunnel face are diverted to clean water tanks and sewage tanks on both sides of the initial support section of the tunnel by using buried steel pipes. Water pumps are used to transport water from the clean water tank and the sewage tank to the temporary drainage ditches on both sides of the secondary lining construction section of the tunnel through drainage pipes. The temporary drainage ditch in the secondary lining construction section receives clean water and sewage pumped from the clean water tank and sewage tank, as well as seepage water from the tunnel wall in the initial support section and underground seepage water in the invert section. The clean water and sewage are diverted separately by the clean water and sewage diversion baffle in the temporary drainage ditch in the secondary lining construction section. The clean water and sewage from the temporary drainage ditch in the secondary lining construction section are diverted to the drainage ditch in the secondary lining forming section; The clean water is diverted to the sedimentation tank outside the tunnel by using the clear water ditch in the drainage ditch of the secondary lining forming section; The sewage is diverted to the sedimentation tank of the sewage treatment plant outside the tunnel through the sewage ditch in the secondary lining forming section for sewage treatment. The treated wastewater is discharged into the local drainage system or reused.

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