Interval drainage device and metro interval drainage system

Abstract

The application provides an interval drainage device and a subway interval drainage system, and belongs to the technical field of subway interval drainage devices. The device comprises a cabinet body, a control device, a water inlet pipe, a drainage pipe and a displacement pump are installed in the cabinet body. The inlet of the displacement pump is communicated with the water inlet pipe. The water inlet pipe has a left water inlet section and a right water inlet section. The left water inlet section is provided with a left control valve and has a left water inlet connector. The right water inlet section is provided with a right control valve and has a right water inlet connector. The outlet of the displacement pump is communicated with the drainage pipe. The drainage pipe has a drainage connector. The control device, the water inlet pipe, the drainage pipe and the displacement pump are integrated in the cabinet body. After integral assembly, the device can be transferred to an interval passage between two tunnels. In the field, only the left water inlet connector, the right water inlet connector and the drainage connector are needed to be connected with external suction pipes and pipe networks respectively to form an interval drainage system. The device has high integration degree, reduces the space required for installation, is convenient for assembly and maintenance, and is suitable for interval drainage between two subway shield tunnels with small space.

Description

Technical Field

[0001] This application belongs to the technical field of subway section drainage devices, and more specifically, relates to a section drainage device and a subway section drainage system. Background Technology

[0002] Subways are located underground, and their natural drainage is limited, usually requiring the use of pumping equipment. Rainwater and groundwater seepage are generally collected in sump pits through drainage ditches, and then pumped out. Typically, a second sump pit is built between two shield tunnels to collect the water, a design that facilitates the collection of water and its pumping out.

[0003] For example, in the prior art, Chinese invention patent CN114592912B discloses a mechanical method for drainage in a shield-tunnel separation island-type subway station. This system collects accumulated water from the main bodies of the left and right shield tunnels into a wastewater pool in the central platform shield tunnel, from which it is then discharged by a main drainage pump. However, this prior art is only suitable when there is sufficient space between the two shield tunnels. If the space between the two tunnels is limited, it is difficult to specifically design a new space for drainage. Furthermore, the aforementioned patent requires a dedicated wastewater pumping station for installing the drainage equipment, resulting in a large space requirement, low equipment integration, and the need for on-site assembly of many components, making construction and maintenance difficult. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a drainage device for a water collection tank section and a drainage system for a subway section, which integrates drainage equipment such as drainage pumps and control systems, reducing space occupation and simplifying construction and maintenance. It is suitable for drainage in the narrow space between two subway shield tunnels.

[0005] To achieve the above objectives, the technical solution of this application provides a zone drainage device, including a cabinet, a control device, an inlet pipe, a drain pipe, and a volumetric pump installed inside the cabinet; the inlet of the volumetric pump is connected to the middle of the inlet pipe, and the portions of the inlet pipe on both sides of the inlet of the volumetric pump are a left inlet section and a right inlet section, respectively; a left control valve is provided in the passage of the left inlet section, and the end of the left inlet section extends out of the outside of the cabinet and is provided with a left inlet connector; a right control valve is provided in the passage of the right inlet section, and the end of the right inlet section extends out of the outside of the cabinet and is provided with a right inlet connector; the outlet of the volumetric pump is connected to the drain pipe, and the end of the drain pipe away from the outlet of the volumetric pump extends out of the outside of the cabinet and is provided with a drain connector; the volumetric pump, the left control valve, and the right control valve are all controlled by the control device.

[0006] The inter-tunnel drainage system integrates control devices, inlet pipes, drainage pipes, and volumetric pumps within a cabinet. It can be assembled as a whole and then transferred to the inter-tunnel passageway between tunnel sections. On-site, it only requires connection to external suction pipes and pipe networks via left and right inlet connectors and drainage connectors, respectively. This reduces construction and assembly difficulty and facilitates disassembly and maintenance. Furthermore, the high degree of integration of the inter-tunnel drainage system reduces the space required for installation, eliminating the need for additional space to house the drainage system via shield tunneling. This makes it suitable for drainage in the confined space between two subway shield tunnels.

[0007] Optionally, the system has two sets of inlet pipes and two volumetric pumps. The inlets of the two volumetric pumps are connected to the middle of the two sets of inlet pipes, and the outlets of the two volumetric pumps are connected to the drain pipe. The two sets of inlet pipes and the two volumetric pumps serve as backups for each other. When one volumetric pump fails, the other set of volumetric pumps, along with the corresponding left and right control valves, will operate to prevent drainage interruption. Even when no failure occurs, if the water level in the collection tank cannot be lowered using a single volumetric pump, both sets of volumetric pumps can be activated simultaneously to increase the drainage volume.

[0008] Optionally, the cabinet also includes a maintenance valve, and the drain pipe extends to an outlet connection section. One end of the maintenance valve connects to the outlet connection section, and the other end is detachably connected to the outlet of the volumetric pump. The inlet pipe extends to an inlet connection section, and the inlet of the volumetric pump is detachably connected to the inlet connection section. When a volumetric pump malfunctions, closing the maintenance valve corresponding to that pump will cut off its connection to the drain pipe. At this time, the inlet of the malfunctioning pump can be disconnected from the inlet connection section, and the outlet can be disconnected from the maintenance valve, allowing the pump to be removed from the cabinet door for replacement or repair. During the repair of the malfunctioning pump, another standby volumetric pump can operate normally without interrupting the drainage process.

[0009] Optionally, the outlet of the positive displacement pump is connected to the maintenance valve via a flange or grooved connection, and the inlet of the positive displacement pump is connected to the inlet mating section via a flange or grooved connection. Flange and grooved connections ensure a tight seal while allowing for disassembly.

[0010] Optionally, the cabinet contains a chassis with omnidirectional balls on top. A movable seat is placed on top of the omnidirectional balls, and the volumetric pump is fixedly mounted on top of the movable seat. Support bolts are installed on the chassis, with their tips screwed through from the bottom to the top of the chassis, extending beyond the top of the chassis to abut against the movable seat. During operation, the support bolts lift the movable seat, detaching it from the omnidirectional balls, ensuring that the omnidirectional balls do not contact the movable seat during operation, guaranteeing smooth operation and reducing vibration. When the volumetric pump is disassembled, the support bolts are screwed downwards to lower the movable seat, which is then supported on top of the omnidirectional balls. At this point, the movable seat can move freely on the omnidirectional balls, and pulling out the movable seat allows the volumetric pump to be removed, facilitating its transfer to the outside of the cabinet.

[0011] Optionally, a backwash pipe is also installed inside the cabinet. The middle part of the backwash pipe is connected to the drain pipe. The two sides of the backwash pipe where it connects to the drain pipe are the left and right flushing sections, respectively. The ends of both the left and right flushing sections extend outward from the outside of the cabinet and are equipped with flushing connectors. The flow rate between units of the backwash pipe is less than the flow rate per unit time of the volumetric pump. After the volumetric pump draws water into the drain pipe, a portion of the water entering the drain pipe will flow back to the collection tank through the backwash pipe under the action of internal pressure and gravity, flushing the collection tank, such as flushing the filter screen or the suction pipe inlet, to prevent clogging.

[0012] A subway tunnel drainage system employs the aforementioned tunnel drainage device, comprising a left tunnel body and a right tunnel body. A left collection pool is located at the bottom of the left tunnel body, and a right collection pool is located at the bottom of the right tunnel body. A tunnel passage connects the left and right tunnel bodies, and the tunnel drainage device is placed in the tunnel passage. A left level gauge is installed in the left collection pool, and a right level gauge is installed in the right collection pool. Both the left and right level gauges are connected to a control device. The end of the left inlet section extending out of the cabinet is connected to a left suction pipe extending to the left collection pool via a left inlet connector. The end of the right inlet section extending out of the cabinet is connected to a right suction pipe extending to the right collection pool via a right inlet connector. The end of the drain pipe extending out of the cabinet is connected to a sewage pipe via a drain connector. The end of the sewage pipe away from the drain pipe is used to connect to an external pipe network.

[0013] During construction and installation, the left suction pipe, right suction pipe, and sewage pipe are set up on-site. The assembled drainage system is then transported to the tunnel section. The left suction pipe is connected to the left inlet section, the right suction pipe to the right inlet section, and the sewage pipe to the drain pipe to complete assembly. Finally, debugging is performed. Construction is convenient. The tunnel section only needs to provide sufficient space to accommodate the drainage system and for construction; there is no need to install an additional drainage system via tunnel boring machine (TBM). This method is suitable for drainage in the confined space between two subway TBM tunnels. Compared to submersible pumps or other suction equipment that are immersed in water, the positive displacement pump used in this solution does not need to be submerged in sewage, resulting in less water corrosion and a longer service life.

[0014] Optionally, a left filter box is installed in the left collection tank, and a right filter box is installed in the right collection tank. Both the left and right filter boxes have a bottom surface and a circumferentially arranged fence around the bottom surface, with filter holes distributed on the fence. The bottom surface of the left filter box is fixedly connected to the bottom wall of the left collection tank, and the end of the left suction pipe located inside the left collection tank is located inside the left filter box. Similarly, the bottom surface of the right filter box is fixedly connected to the bottom wall of the right collection tank, and the end of the right suction pipe located inside the right collection tank is located inside the right filter box. Water in the left and right collection tanks first passes through the filter holes on the fence, blocking large-volume solid waste outside the fence before being sucked by the volumetric pump, thus preventing large-volume waste from clogging the pipe passages and the volumetric pump.

[0015] Optionally, a left vertical filter cylinder is fixedly installed inside the left filter box, with its bottom end fixedly connected to the bottom wall of the left filter box. The port of the left suction pipe inside the left filter box is connected to the top of the left vertical filter cylinder. Similarly, a right vertical filter cylinder is fixedly installed inside the right filter box, with its bottom end fixedly connected to the bottom wall of the right filter box. The port of the right suction pipe inside the right filter box is connected to the top of the right vertical filter cylinder. Since the tops of the left and right filter boxes are open, large-volume solid waste may fall into them. Therefore, by installing left and right vertical filter cylinders at the ends of the left and right suction pipes respectively, large-volume solid waste is prevented from directly entering the left and right suction pipes.

[0016] A subway tunnel drainage system employs the aforementioned tunnel drainage device with a backwash pipe, comprising a left tunnel body and a right tunnel body. A left collection tank is located at the bottom of the left tunnel body, and a right collection tank is located at the bottom of the right tunnel body. A tunnel passage connects the left and right tunnel bodies, and the tunnel drainage device is placed within this passage. A left level gauge is installed in the left collection tank, and a right level gauge is installed in the right collection tank. Both level gauges are connected to a control device. The end of the left inlet section extending out of the cabinet is connected to a left suction pipe extending to the left collection tank via a left inlet connector. The end of the right inlet section extending out of the cabinet is connected to a right suction pipe extending to the right collection tank via a right inlet connector. A drain pipe extending out of the cabinet is connected to a sewage pipe via a drain connector. The end of the sewage pipe furthest from the drain pipe is connected to an external pipe network. A left vertical filter cylinder is fixedly installed in the left collection tank, with its bottom end flush with the bottom wall of the left collection tank. The left suction pipe, located inside the left water collection tank, connects to the top of the left vertical filter cylinder. A right vertical filter cylinder is fixedly installed inside the right water collection tank, with its bottom end connected to the bottom wall of the right water collection tank. The right suction pipe, located inside the right water collection tank, connects to the top of the right vertical filter cylinder. The left flushing section extends outward from the outer end of the cabinet and connects to a left flushing connecting pipe via a flushing connector. The end of the left flushing connecting pipe away from the left flushing section connects to a left annular spray pipe. The left annular spray pipe surrounds the top outer side of the left vertical filter cylinder, and its bottom side has left spray nozzles facing the outer wall of the left vertical filter cylinder. The right flushing section extends outward from the outer end of the cabinet and connects to a right flushing connecting pipe via a flushing connector. The end of the right flushing connecting pipe away from the left flushing section connects to a right annular spray pipe. The right annular spray pipe surrounds the top outer side of the right vertical filter cylinder, and its bottom side has right spray nozzles facing the outer wall of the right vertical filter cylinder.

[0017] During operation, a portion of the water pumped into the drain pipe flows back to the left and right collection tanks via the backwash pipe. Water then enters the left annular spray pipe through the left flushing section and the left flushing connecting pipe. Under the influence of internal pressure and height difference, the water in the left annular spray pipe is sprayed out through the left spray nozzle onto the surface of the left vertical filter cylinder, flushing away the dirt clogging the filter holes and preventing clogging. Similarly, water enters the right annular spray pipe through the right flushing section and the right flushing connecting pipe, and the water in the right annular spray pipe is sprayed out through the right spray nozzle onto the surface of the right vertical filter cylinder, flushing away the dirt clogging the filter holes and preventing clogging.

[0018] The advantages of the technical solution in this application compared to the prior art are as follows: The inter-tunnel drainage system integrates control devices, inlet pipes, drainage pipes, and volumetric pumps within a cabinet. It can be assembled as a whole and then transferred to the inter-tunnel passageway between tunnel sections. On-site, it only requires connection to external suction pipes and pipe networks via left and right inlet connectors and drainage connectors, respectively. This reduces construction and assembly difficulty and facilitates disassembly and maintenance. Furthermore, the high degree of integration of the inter-tunnel drainage system reduces the space required for installation and eliminates the need for an additional drainage system via tunnel boring machine (TBM), making it suitable for drainage in the confined space between two subway TBM tunnels.

[0019] After installation into the overall subway drainage system, the inter-section drainage device occupies little space, is easy to assemble, and is convenient to maintain. Compared to submersible pumps or other suction equipment that are immersed in water, the positive displacement pump used in this solution does not need to be submerged in sewage, is less susceptible to water corrosion, and has a longer service life. Furthermore, the equipment can be frequency-controlled. The control device uses the water level measured by the left and right level gauges and the PLC's PID function to automatically match the speed of the positive displacement pump, achieving fully automatic operation and reducing manual intervention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a front view of the overall structure of the drainage device in the water collection tank area; Figure 2 A schematic diagram of the overall structure of the drainage device in the water collection tank area; Figure 3 This is a schematic diagram of the support structure for a positive displacement pump. Figure 4 This is a schematic diagram of the drainage system structure of a subway section. Figure 5 for Figure 4 Enlarged view of a portion of point A in the middle; Figure 6 for Figure 4 Enlarged view of a section at point B in the middle; Figure 7 This is a schematic diagram of the internal structure of the left filter box.

[0022] Icons: 1. Cabinet; 11. Chassis; 12. Ball joint; 13. Movable base; 14. Support bolt; 15. Left chamber; 16. Right chamber; 2. Inlet pipe; 21. Left inlet section; 22. Right inlet section; 23. Left control valve; 24. Right control valve; 25. Left inlet connector; 26. Right inlet connector; 27. Inlet connection section; 3. Drain pipe; 31. Drain connector; 32. Inspection valve; 33. Outlet connection section; 4. Volumetric pump; 5. Backwash pipe; 51. Left flush section; 52. Right flush section Section; 53. Flushing joint; 54. Vertical connecting pipe; 61. Left tunnel main body; 611. Left water collection tank; 62. Right tunnel main body; 621. Right water collection tank; 63. Intersection passage; 71. Left suction pipe; 72. Right suction pipe; 73. Sewage pipe; 81. Left filter box; 82. Right filter box; 83. Bottom surface; 84. Fence; 85. Left vertical filter cylinder; 86. Right vertical filter cylinder; 91. Left flushing connecting pipe; 92. Left annular spray pipe; 93. Right flushing connecting pipe; 94. Right annular spray pipe. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] Example 1: This embodiment provides a section drainage device, based on Figure 1 and Figure 2 As shown, the device includes a cabinet 1, which houses a control device, a water inlet pipe 2, a drain pipe 3, and a volumetric pump 4. In this embodiment, the cabinet 1 has a left chamber 15 and a right chamber 16, both of which have doors on their front sides. Figure 1 and Figure 2The cabinet door of the right chamber 16 is concealed. The control device is installed in the left chamber 15, and the inlet pipe 2, drain pipe 3, and volumetric pump 4 are installed in the right chamber 16. The inlet of the volumetric pump 4 is connected to the middle of the inlet pipe 2. The parts of the inlet pipe 2 located on both sides of the inlet of the volumetric pump 4 are the left inlet section 21 and the right inlet section 22, respectively. A left control valve 23 is installed on the passage of the left inlet section 21. The end of the left inlet section 21 extends out of the outside of the cabinet 1 and is equipped with a left inlet connector 25. A right control valve 24 is installed on the passage of the right inlet section 22. The end of the right inlet section 22 extends out of the outside of the cabinet 1 and is equipped with a right inlet connector 26. The outlet of the volumetric pump 4 is connected to the drain pipe 3. The end of the drain pipe 3 away from the outlet of the volumetric pump 4 extends out of the outside of the cabinet 1 and is equipped with a drain connector 31. The volumetric pump 4, the left control valve 23, and the right control valve 24 are all controlled by the control device. In this embodiment, the left inlet connector 25, the right inlet connector 26, and the drain connector 31 can adopt a flange structure, which connects to the external pipeline through the flange and ensures a seal. Both the inlet pipe 2 and the drain pipe 3 are arranged horizontally. The end of the left inlet section 21 passes through the left chamber 15 and extends out of the cabinet 1 from the left side, while the right inlet section 22 and the drain pipe 3 extend out of the cabinet 1 from the right side. In other embodiments, the left inlet connector 25, the right inlet connector 26, and the drain connector 31 can also adopt a grooved structure or a threaded structure, etc.

[0025] In actual use, the left inlet section 21 and the right inlet section 22 are connected to the water collection pools of the two tunnels via external pipelines to drain water from the water collection pools on both sides. The drain pipe 3 is connected to the external pipe network via the drain connector 31. The control device integrates a PLC controller and a frequency converter. The drainage device in each section is equipped with a static pressure level gauge installed in the water collection pool to monitor water level changes in real time. When the water level in a certain water collection pool reaches a specific height, the control device controls the corresponding left control valve 23 and right control valve 24 to open, and the volumetric pump 4 draws water from the water collection pool. The water in the water collection pool is discharged to the external pipe network through the inlet pipe 2 and the drain pipe 3. The frequency converter monitors the current and voltage parameters of the volumetric pump 4 in real time. Based on the changes in these real-time monitored parameters, the control device immediately responds with relevant operating parameter adjustments, early warnings, alarms, fault detection, and standby switching automatic adjustment functions to ensure stable system operation.

[0026] In this embodiment, the inter-tunnel drainage device integrates the control device, inlet pipe 2, drain pipe 3, and volumetric pump 4 within the cabinet 1. It can be assembled as a whole and then transferred to the inter-tunnel passage 63 between tunnel sections. On-site, it only needs to be connected to the external suction pipe and pipeline network via the left inlet connector 25, right inlet connector 26, and drain connector 31, respectively. This reduces the difficulty of construction and assembly and facilitates disassembly and maintenance. Furthermore, the high degree of integration of the inter-tunnel drainage device reduces the space required for installation, eliminating the need for additional space to house the drainage system via shield tunneling. It is suitable for drainage in the confined space between two subway shield tunnels.

[0027] Preferably, based on Figure 1 and Figure 2 As shown, there are two sets of inlet pipes 2 and two volumetric pumps 4. The inlets of the two volumetric pumps 4 are connected to the middle of the two sets of inlet pipes 2, and the outlets of the two volumetric pumps 4 are connected to the drain pipe 3. In this embodiment, the two sets of inlet pipes 2 are arranged side by side. In actual use, the left inlet sections 21 of the two sets of inlet pipes 2 are connected to the same location in the same collection tank through external pipelines, and the right inlet sections 22 of the two sets of inlet pipes 2 are connected to the same location in another collection tank through external pipelines. The two sets of inlet pipes 2 and the two volumetric pumps 4 serve as backups for each other. When one of the volumetric pumps 4 fails, the control device will determine the occurrence of the failure based on the current and voltage of the volumetric pump 4, and control the volumetric pump 4 and the corresponding left control valve 23 and right control valve 24 to close. At the same time, the control device will start the other set of volumetric pumps 4 and the corresponding left control valve 23 and right control valve 24 to prevent drainage interruption. Of course, if a single volumetric pump 4 cannot lower the water level in the collection tank when no malfunction occurs, both sets of volumetric pumps 4 can be activated simultaneously to increase the drainage volume. In other embodiments, the left inlet sections 21 of both sets of inlet pipes 2 can be connected to different locations in the same collection tank via external pipelines, and the right inlet sections 22 of both sets of inlet pipes 2 can be connected to different locations in another collection tank via external pipelines, thus serving as two independent suction pipes.

[0028] Furthermore, based on Figure 1 and Figure 2 As shown, a maintenance valve 32 is also installed inside the cabinet 1. The drain pipe 3 extends to form an outlet connection section 33. One end of the maintenance valve 32 connects to the outlet connection section 33, and the other end of the maintenance valve 32 is detachably connected to the outlet of the volumetric pump 4. An inlet connection section 27 extends from the middle of the inlet pipe 2, and the inlet of the volumetric pump 4 is detachably connected to the inlet connection section 27. In this embodiment, the maintenance valve 32 is a manual valve, and both the inlet pipe 2 and the drain pipe 3 are horizontally installed on top of the volumetric pump 4. The outlet connection section 33 extends downward from the side wall of the drain pipe 3, and the inlet connection section 27 extends downward from the side wall of the inlet pipe 2. The connection between the maintenance valve 32 and the outlet connection section 33, the connection between the maintenance valve 32 and the volumetric pump 4, and the connection between the inlet of the volumetric pump 4 and the inlet connection section 27 are preferably detachable using a grooved connection method. The grooved connection method occupies less space and is more suitable for disassembly and assembly operations in confined spaces. In other embodiments, the connection between the maintenance valve 32 and the outlet docking section 33, the connection between the maintenance valve 32 and the volumetric pump 4, and the detachable connection between the inlet of the volumetric pump 4 and the inlet docking section 27 can also be achieved by means of flange connection.

[0029] When a volumetric pump 4 malfunctions, closing the corresponding maintenance valve 32 will block its connection to the drain pipe 3. At this time, disassembling the inlet and inlet connection section 27 of the malfunctioning pump 4, and disconnecting the outlet from the maintenance valve 32, allows the pump 4 to be removed from the front door of the cabinet 1 for replacement or repair. Since the malfunctioning pump 4 is shut down, the control device will close the corresponding left control valve 23 and right control valve 24, blocking water inflow. Even if the left control valve 23 and right control valve 24 are not closed, the water in the corresponding inlet pipe 2 will flow back to the collection tank under gravity, preventing water gushing after disassembly. During the repair of the malfunctioning pump 4, another standby pump 4 can operate normally without interrupting the drainage process.

[0030] Furthermore, based on Figures 1 to 3 As shown, a chassis 11 is installed inside the cabinet 1. Universal balls 12 are distributed on the top of the chassis 11, and a movable seat 13 is placed on top of the universal balls 12. The volumetric pump 4 is fixedly installed on the top of the movable seat 13. Simultaneously, a support bolt 14 is installed on the chassis 11. The top of the support bolt 14 screws through from the bottom of the chassis 11 to the top of the chassis 11, extending beyond the top of the chassis 11 and abutting against the movable seat 13. During actual operation, the support bolt 14 lifts the movable seat 13, detaching it from the universal balls 12, ensuring that the universal balls 12 do not contact the movable seat 13 during operation, guaranteeing smooth operation and reducing vibration. When the volumetric pump 4 is disassembled, the support bolt 14 is screwed downwards to lower the movable seat 13, which is then supported on top of the universal balls 12. At this time, the movable seat 13 can move freely on the universal balls 12. Pulling out the movable seat 13 allows the volumetric pump 4 to be moved out, facilitating its transfer to the outside of the cabinet 1. Installation is performed by reversing the operation.

[0031] Example 2: This embodiment provides a section drainage device, based on Figure 1 and Figure 2 As shown, based on the scheme of Embodiment 1, a backwash pipe 5 is also provided inside the cabinet 1. The middle part of the backwash pipe 5 is connected to the drain pipe 3. The two sides of the backwash pipe 5 at the connection with the drain pipe 3 are respectively the left flushing section 51 and the right flushing section 52. The ends of the left flushing section 51 and the right flushing section 52 extend out of the outside of the cabinet 1. The ends of the left flushing section 51 and the right flushing section 52 extending out of the cabinet 1 are provided with flushing connectors 53. The flow rate of the backwash pipe 5 is less than the flow rate of the volumetric pump 4 per unit time. In this embodiment, the flushing connector 53 adopts a flange structure, and the connection with the external pipeline is achieved through the flange. The backwash pipes 5 are all arranged horizontally on the rear side of the volumetric pump 4, and the drain pipe 3 and the backwash pipe 5 are connected through a vertical connecting pipe 54. In other embodiments, the flushing connector 53 can also adopt a grooved structure or a threaded structure, etc.

[0032] In actual use, the left flushing section 51 and the right flushing section 52 are connected to two collection tanks via external pipelines. After the volumetric pump 4 draws water into the drain pipe 3, a portion of the water entering the drain pipe 3 will flow back to the collection tank through the backwash pipe 5 under internal pressure and gravity, flushing the collection tank, such as the filter screen or the suction inlet, to prevent clogging. The flow rate per unit of the backwash pipe 5 is less than the flow rate per unit time of the volumetric pump 4, so only a portion of the water drawn into the drain pipe 3 flows back, not all of it. The specific flow rate can be achieved by setting the diameter of the backwash pipe 5 to be smaller than the diameter of the inlet pipe 2. During the suction process of the volumetric pump 4, since the backwash pipe 5 is located downstream of the outlet of the volumetric pump 4, and considering the internal resistance loss, the water pressure in the backwash pipe 5 will not be higher than the water pressure at the volumetric pump 4. Combined with the smaller pipe diameter, the flow rate per unit of the backwash pipe 5 can always be kept less than the flow rate per unit time of the volumetric pump 4. In other embodiments, the flow rate of the backwash pipe 5 can also be achieved by installing a valve controlled by a control device on the vertical connecting pipe 54.

[0033] Example 3: This embodiment provides a subway section drainage system based on... Figure 1 and Figure 4 As shown, the section drainage device of Embodiment 1 is adopted, including a left tunnel body 61 and a right tunnel body 62. A left collection pool 611 is provided at the bottom of the left tunnel body 61, and a right collection pool 621 is provided at the bottom of the right tunnel body 62. Specifically, the left collection pool 611 and the right collection pool 621 are located on the ground between the railway tracks. A section passage 63 connects the left tunnel body 61 and the right tunnel body 62, and the section drainage device is placed in the section passage 63. The ground position of the section passage 63 must be ensured to be higher than the top edge of the left collection pool 611 and the right collection pool 621 to avoid water accumulation in the section passage 63. A left level gauge is installed in the left water collection tank 611, and a right level gauge is installed in the right water collection tank 621. Both the left and right level gauges are connected to the control device. The left water inlet section 21 extends out of the cabinet 1 and is connected to the left suction pipe 71 extending to the left water collection tank 611 via the left water inlet connector 25. The right water inlet section 22 extends out of the cabinet 1 and is connected to the right suction pipe 72 extending to the right water collection tank 621 via the right water inlet connector 26. The drain pipe 3 extends out of the cabinet 1 and is connected to the sewage pipe 73 via the drain connector 31. The end of the sewage pipe 73 away from the drain pipe 3 is used to connect to the external pipe network.

[0034] During operation, the left and right level gauges monitor the water depth in the left and right collection tanks 611 and 621 in real time. If the water depth in the left collection tank 611 reaches the set height, the control device activates the volumetric pump 4 and the corresponding left control valve 23. Water in the left collection tank 611 flows sequentially through the left suction pipe 71, the left inlet section 21, and the volumetric pump 4, and is discharged to the external pipe network through the drain pipe 3 and the sewage pipe 73. The same applies when the water depth in the right collection tank 621 reaches the set height. During construction and installation, the left suction pipe 71, the right suction pipe 72, and the sewage pipe 73 are installed on-site. The assembled drainage device is then transported to the section passage 63. The left suction pipe 71 is connected to the left inlet section 21, the right suction pipe 72 is connected to the right inlet section 22, and the sewage pipe 73 is connected to the drain pipe 3 to complete the assembly. Finally, debugging is performed, making construction convenient. Section 63 only needs to provide space for the drainage device and construction, without the need for an additional drainage system via tunnel boring machine (TBM). It is suitable for drainage in the narrow space between two subway TBM tunnels. Compared to submersible pumps or other suction equipment that are immersed in water, the positive displacement pump 4 used in this solution does not need to be submerged in sewage, is less susceptible to water corrosion, and has a longer service life.

[0035] Furthermore, based on Figures 4 to 6As shown, a left filter box 81 is installed in the left water collection tank 611, and a right filter box 82 is installed in the right water collection tank 621. Both the left filter box 81 and the right filter box 82 have a bottom surface 83 and a fence 84 arranged circumferentially around the bottom surface 83. Filter holes are distributed on the fence 84. The bottom surface 83 of the left filter box 81 is fixedly connected to the bottom wall of the left water collection tank 611. The end of the left suction pipe 71 located in the left water collection tank 611 is located inside the left filter box 81. The bottom surface 83 of the right filter box 82 is fixedly connected to the bottom wall of the right water collection tank 621. The end of the right suction pipe 72 located in the right water collection tank 621 is located inside the right filter box 82. In this embodiment, for the case with two sets of inlet pipes 2 and two volumetric pumps 4, there are two sets of both the left suction pipe 71 and the right suction pipe 72, which are respectively connected to the two ends of the two sets of inlet pipes 2. The ends of the two sets of left suction pipes 71 located in the left collection pool 611 are both located in the same left filter box 81, and the ends of the two sets of right suction pipes 72 located in the right collection pool 621 are both located in the same right filter box 82, so as to achieve mutual backup. In use, the water in the left and right collection pools 611 and 621 first passes through the filter holes on the enclosure 84, blocking large solid waste outside the enclosure 84 before being sucked by the volumetric pump 4, preventing large solid waste from clogging the pipe passages and the volumetric pump 4. To increase the flow rate, the portion of the enclosure 84 opposite to the side wall of the collection pool has a certain gap with the side wall of the collection pool, ensuring that sewage can pass through all four sides of the enclosure 84. For the volumetric pump 4, it is preferable to use a volumetric pump 4 with a certain solids tolerance, allowing small solids or fibrous materials to pass through, avoiding clogging. Generally, a volumetric pump 4 with a maximum self-priming depth of 9 meters and the ability to pass through solid particles of 70mm can be selected. The corresponding filter hole diameter on the enclosure 84 is no greater than 70mm.

[0036] Furthermore, a left vertical filter cylinder 85 is fixedly installed inside the left filter box 81, with its bottom end fixedly connected to the bottom wall of the left filter box 81. The port of the left suction pipe 71 located inside the left filter box 81 is connected to the top end of the left vertical filter cylinder 85. A right vertical filter cylinder 86 is fixedly installed inside the right filter box 82, with its bottom end fixedly connected to the bottom wall of the right filter box 82. The port of the right suction pipe 72 located inside the right filter box 82 is connected to the top end of the right vertical filter cylinder 86. Both the left and right vertical filter cylinders 85 and 86 have filter holes distributed on their surfaces. Since the tops of the left and right filter boxes 81 and 82 are open, large-volume solid waste may fall in. Therefore, by installing left vertical filter cylinders 85 and 86 at the ends of the left and right suction pipes 71 and 72 respectively, large-volume solid waste is prevented from directly entering the left and right suction pipes 71 and 72. Furthermore, since the surface area of ​​the left vertical filter cylinder 85 and the right vertical filter cylinder 86 is relatively small, they are prone to clogging if there is too much large volume solid waste. Therefore, the fences 84 of the left filter box 81 and the right filter box 82 first intercept most of the large volume solid waste, and the left vertical filter cylinder 85 and the right vertical filter cylinder 86 then intercept the large volume solid waste that falls directly into the left filter box 81 and the right filter box 82.

[0037] Example 4: This embodiment provides a subway section drainage system, which adopts the section drainage device in Embodiment 2, based on... Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, since a backwash pipe 5 is installed inside the cabinet 1, this embodiment is specifically based on the technical solution of embodiment 3, with the addition of a backwash pipe 5 inside the cabinet 1. In the backwash pipe 5, the left flushing section 51 extends out of the outer end of the cabinet 1 and is connected to a left flushing connecting pipe 91 via a flushing connector 53. The end of the left flushing connecting pipe 91 away from the left flushing section 51 is connected to a left annular spray pipe 92. The left annular spray pipe 92 is arranged around the outer side of the top of the left vertical filter cylinder 85, and the bottom side of the left annular spray pipe 92 has left spray nozzles facing the outer wall of the left vertical filter cylinder 85. The right flushing section 52 extends out of the outer end of the cabinet 1 and is connected to a right flushing connecting pipe 93 via a flushing connector 53. The end of the right flushing connecting pipe 93 away from the left flushing section 51 is connected to a right annular spray pipe 94. The right annular spray pipe 94 is arranged around the outer side of the top of the right vertical filter cylinder 86, and the bottom side of the right annular spray pipe 94 has right spray nozzles facing the outer wall of the right vertical filter cylinder 86.

[0038] During use, a portion of the water pumped into the drain pipe 3 by the volumetric pump 4 flows back to the left collection tank 611 and the right collection tank 621 through the backwash pipe 5. Water enters the left annular spray pipe 92 through the left flushing section 51 and the left flushing connecting pipe 91. Under the action of internal pressure and height difference, the water in the left annular spray pipe 92 is sprayed out through the left spray nozzle onto the surface of the left vertical filter cylinder 85, flushing away the dirt clogging the filter holes of the left vertical filter cylinder 85 and preventing the left vertical filter cylinder 85 from becoming clogged. Similarly, water enters the right annular spray pipe 94 through the right flushing section 52 and the right flushing connecting pipe 93. The water in the right annular spray pipe 94 is sprayed out through the right spray nozzle onto the surface of the right vertical filter cylinder 86, flushing away the dirt clogging the filter holes of the right vertical filter cylinder 86 and preventing the right vertical filter cylinder 86 from becoming clogged. In this embodiment, with two water inlet pipes 2, there are two left vertical filter cylinders 85 and two right vertical filter cylinders 86. Based on Figure 7 As shown, the left flushing connecting pipe 91 can be divided into two branches within the left water collection tank 611. Each branch is connected to a set of left annular spray pipes 92. The two sets of annular spray pipes are respectively arranged around the outer top of the two sets of left vertical filter cylinders 85 to flush the two left vertical filter cylinders 85 simultaneously. The right flushing connecting pipe 93 is similar.

[0039] Furthermore, since the left vertical filter cylinder 85 and the right vertical filter cylinder 86 can be flushed, the risk of clogging is greatly reduced. Therefore, the left filter box 81 and the right filter box 82 can be omitted, and the bottom end of the left vertical filter cylinder 85 and the bottom end of the right vertical filter cylinder 86 can be directly fixed to the bottom wall of the left water collection tank 611. Of course, if the left filter box 81 and the right filter box 82 are installed in addition to the backwashing device, a better anti-clogging effect can be achieved.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A drainage device for inter-district drainage, characterized in that: The system includes a cabinet, inside which a control device, an inlet pipe, a drain pipe, and a volumetric pump are installed. The inlet of the volumetric pump is connected to the middle of the inlet pipe. The portions of the inlet pipe on either side of the inlet of the volumetric pump are a left inlet section and a right inlet section, respectively. A left control valve is installed in the passage of the left inlet section, and the end of the left inlet section extends out of the outside of the cabinet and is equipped with a left inlet connector. A right control valve is installed in the passage of the right inlet section, and the end of the right inlet section extends out of the outside of the cabinet and is equipped with a right inlet connector. The outlet of the volumetric pump is connected to the drain pipe, and the end of the drain pipe away from the outlet of the volumetric pump extends out of the outside of the cabinet and is equipped with a drain connector. The volumetric pump, the left control valve, and the right control valve are all controlled by the control device.

2. The interval drainage device as described in claim 1, characterized in that: The water inlet pipe has two sets, and the volumetric pump has two pumps. The inlets of the two volumetric pumps are respectively connected to the middle of the two sets of water inlet pipes, and the outlets of the two volumetric pumps are connected to the drain pipe.

3. The interval drainage device as described in claim 1, characterized in that: The cabinet is also equipped with an inspection valve, and the drain pipe extends to have an outlet connection section. One end of the inspection valve is connected to the outlet connection section, and the other end of the inspection valve is detachably connected to the outlet of the volumetric pump. The middle of the water inlet pipe extends to have an inlet connection section, and the inlet of the volumetric pump is detachably connected to the inlet connection section.

4. The interval drainage device as described in claim 3, characterized in that: The outlet of the volumetric pump is connected to the maintenance valve by a flange or a groove, and the inlet of the volumetric pump is connected to the inlet docking section by a flange or a groove.

5. The interval drainage device as described in claim 3, characterized in that: The cabinet is equipped with a chassis, and a universal ball joint is distributed on the top of the chassis. A movable seat is placed on the top of the universal ball joint, and the volumetric pump is fixedly installed on the top of the movable seat. The chassis is equipped with a support bolt, and the top of the support bolt is screwed from the bottom of the chassis to the top of the chassis. The support bolt extends out of the top of the chassis and abuts against the movable seat.

6. The interval drainage device according to any one of claims 1-5, characterized in that: The cabinet is also equipped with a backwash pipe, the middle of which is connected to the drain pipe. The two sides of the backwash pipe where it connects to the drain pipe are respectively a left flushing section and a right flushing section. The ends of the left flushing section and the right flushing section extend out of the outside of the cabinet. The ends of the left flushing section and the right flushing section extending out of the cabinet are equipped with flushing connectors. The flow rate between units of the backwash pipe is less than the flow rate per unit time of the volumetric pump.

7. A drainage system for subway sections, characterized in that: The interval drainage device described in any one of claims 1-5 is adopted, comprising a left tunnel body and a right tunnel body, wherein a left water collection pool is provided at the bottom of the left tunnel body, a right water collection pool is provided at the bottom of the right tunnel body, an interval passage is connected between the left tunnel body and the right tunnel body, and the interval drainage device is placed in the interval passage; A left level gauge is installed in the left water collection tank, and a right level gauge is installed in the right water collection tank. Both the left and right level gauges are connected to the control device. The end of the left water inlet section extending out of the cabinet is connected to a left suction pipe extending to the left water collection tank via the left water inlet connector. The end of the right water inlet section extending out of the cabinet is connected to a right suction pipe extending to the right water collection tank via the right water inlet connector. The end of the drain pipe extending out of the cabinet is connected to a sewage pipe via the drain connector. The end of the sewage pipe away from the drain pipe is used to connect to an external pipe network.

8. The subway section drainage system as described in claim 7, characterized in that: A left filter box is installed in the left water collection tank, and a right filter box is installed in the right water collection tank. Both the left and right filter boxes have a bottom surface and a circumferentially arranged fence around the bottom surface, with filter holes distributed on the fence. The bottom surface of the left filter box is fixedly connected to the bottom wall of the left water collection tank, and the end of the left suction pipe located in the left water collection tank is located in the left filter box. The bottom surface of the right filter box is fixedly connected to the bottom wall of the right water collection tank, and the end of the right suction pipe located in the right water collection tank is located in the right filter box.

9. The subway section drainage system as described in claim 8, characterized in that: A left vertical filter cylinder is fixedly installed inside the left filter box. The bottom end of the left vertical filter cylinder is fixedly connected to the bottom wall of the left filter box. The port of the left suction pipe inside the left filter box is connected to the top end of the left vertical filter cylinder. A right vertical filter cylinder is fixedly installed inside the right filter box. The bottom end of the right vertical filter cylinder is fixedly connected to the bottom wall of the right filter box. The port of the right suction pipe inside the right filter box is connected to the top end of the right vertical filter cylinder.

10. A drainage system for subway sections, characterized in that: The interval drainage device as described in claim 6 is adopted, including a left tunnel body and a right tunnel body. A left water collection pool is provided at the bottom of the left tunnel body, and a right water collection pool is provided at the bottom of the right tunnel body. An interval channel connects the left tunnel body and the right tunnel body, and the interval drainage device is placed in the interval channel. A left level gauge is installed in the left water collection tank, and a right level gauge is installed in the right water collection tank. Both the left and right level gauges are signal-connected to the control device. The end of the left water inlet section extending out of the cabinet is connected to a left suction pipe extending to the left water collection tank via the left water inlet connector. The end of the right water inlet section extending out of the cabinet is connected to a right suction pipe extending to the right water collection tank via the right water inlet connector. The drain pipe extending out of the cabinet is connected to a sewage pipe via the drain connector. The end of the sewage pipe away from the drain pipe is used to connect to an external pipe network. A left vertical filter cylinder is fixedly installed in the left water collection tank, with its bottom end connected to the bottom wall of the left water collection tank. The port of the left suction pipe located in the left water collection tank is connected to the top end of the left vertical filter cylinder. A right vertical filter cylinder is fixedly installed in the right water collection tank, with its bottom end connected to the bottom wall of the right water collection tank. The port of the right suction pipe located in the right water collection tank is connected to the top end of the right vertical filter cylinder. The left flushing section extends from the outer end of the cabinet and is connected to a left flushing connecting pipe via the flushing connector. The end of the left flushing connecting pipe away from the left flushing section is connected to a left annular spray pipe. The left annular spray pipe is arranged around the outer side of the top of the left vertical filter cylinder, and the bottom side of the left annular spray pipe has left spray nozzles facing the outer wall of the left vertical filter cylinder. The right flushing section extends from the outer end of the cabinet and is connected to a right flushing connecting pipe via the flushing connector. The end of the right flushing connecting pipe away from the left flushing section is connected to a right annular spray pipe. The right annular spray pipe is arranged around the outer side of the top of the right vertical filter cylinder, and the bottom side of the right annular spray pipe has right spray nozzles facing the outer wall of the right vertical filter cylinder.

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