Subway section drainage system

Abstract

The utility model provides a subway section drainage system, and relates to the field of subway section drainage. The system comprises a self-suction system, the self-suction system comprises a first self-suction device and a second self-suction device, the first self-suction device comprises a first cam pump and a controller, and the second self-suction device comprises a second cam pump and a dual-power switching box; the pipeline system comprises a first water suction pipe, a second water suction pipe and a water pumping header pipe, a first electric valve set is arranged on the first water suction pipe, a second electric valve set is arranged on the second water suction pipe, and the first water suction pipe is used for communicating the first self-suction device with a water collecting pit in a preset subway line; and the second water suction pipe is used for communicating the second self-suction device with a water collection pit in a preset subway line. According to the system, on one hand, drainage equipment is separated from the water collecting pit, the construction risk of the connection channel in the subway shield section is reduced, on the other hand, arrangement of the drainage equipment in a rail-mounted area is facilitated, and equipment overhaul is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the drainage field of subway section, specifically, relate to a subway section drainage system. BACKGROUND

[0002] With the emergence of rail transit network, more and more subway deep buried tunnels or tunnels crossing complex strata inevitably appear, and according to the evacuation requirements, a communication passage is arranged in the section tunnel, which undertakes the requirements of fire drainage, leakage drainage, daily flushing drainage and the like of the subway section. In the prior art, the communication passage is often combined with the section drainage pump house, but this way greatly increases the structural implementation risk. Therefore, in engineering practice, a submersible pump is arranged in the track bed sump of the section track area to reduce the structural implementation risk. However, after the existing submersible pump is combined with the key power equipment of the track area, the drainage scene is single, the maintenance is inconvenient, the maintainability is poor, the equipment of the track area is increased, and the local structure of the submersible pump applies a steel pipe piece, which brings a safety hazard. Therefore, an urgent need exists for a subway section drainage system, which on the one hand separates the drainage equipment from the sump to reduce the construction risk of the communication passage in the subway shield section, and on the other hand facilitates the arrangement of the track area drainage equipment to facilitate equipment maintenance and improve the maintainability of the section drainage equipment. SUMMARY

[0003] The utility model aims at providing a subway section drainage system to improve the above problems. In order to realize the above purpose, the technical scheme adopted by the utility model is as follows:

[0004] A subway section drainage system, comprising:

[0005] A self-suction system is arranged in the communication passage, the self-suction system comprises a first self-suction device and a second self-suction device, the first self-suction device comprises a first cam pump and a controller, and the second self-suction device comprises a second cam pump and a double power switch box.

[0006] A pipeline system comprises a first water suction pipe, a second water suction pipe and a water lifting main pipe, a first electric valve group is arranged on the first water suction pipe, a second electric valve group is arranged on the second water suction pipe, the first water suction pipe is used to communicate the first self-suction device with the sump in the preset subway line, the second water suction pipe is used to communicate the second self-suction device with the sump in the preset subway line, the water lifting main pipe is used to discharge the wastewater lifted by the first cam pump and the second cam pump after being combined, and the first cam pump, the second cam pump, the double power switch box, the first electric valve group, the second electric valve group and the controller are electrically connected.

[0007] Preferably, the preset subway line comprises a first line and a second line, a first sump is arranged on a drain ditch of the first line, and a second sump is arranged on a drain ditch of the second line.

[0008] The first suction pipe comprises a first suction unit and a second suction unit, the second suction pipe comprises a third suction unit and a fourth suction unit, the first electric valve group comprises a first electric valve and a second electric valve, the second electric valve group comprises a third electric valve and a fourth electric valve, the first suction unit is used for connecting the first self-suction device with the first sump, and the first electric valve is arranged on the first suction unit, the second suction unit is used for connecting the first self-suction device with the second sump, and the second electric valve is arranged on the second suction unit, the third suction unit is used for connecting the second self-suction device with the first sump, and the third electric valve is arranged on the third suction unit, and the fourth suction unit is used for connecting the second self-suction device with the second sump, and the fourth electric valve is arranged on the fourth suction unit.

[0009] Preferably, a liquid level sensor is arranged in the sump in the preset subway line, the first cam pump is provided with a first pump starting liquid level, the second cam pump is provided with a second pump starting liquid level, and the second pump starting liquid level is higher than the first pump starting liquid level, and the liquid level sensor, the dual-power switching box and the controller are electrically connected.

[0010] Preferably, a current sensor is arranged on each of the first cam pump and the second cam pump, and the current sensor is electrically connected with the controller.

[0011] Preferably, a vibration sensor is arranged on each of the first cam pump and the second cam pump, and the vibration sensor is electrically connected with the controller.

[0012] Preferably, a sand trap is arranged, and the sand trap is connected with the sump in the preset subway line, and a filter screen is arranged at the connection position.

[0013] Preferably, the filter screen replacement device comprises a mounting base, a material receiving roller, a material discharging roller, a limiting device and a sub-control system, the material receiving roller is provided with an electric rotating shaft, the electric rotating shaft, the limiting device and the sub-control system are electrically connected, the material receiving roller is rotationally connected to the bottom of the mounting base, the material discharging roller is rotationally connected to the top of the mounting base, and the limiting device is arranged in the circumferential direction of the material receiving roller.

[0014] Preferably, the sand deposition position sensor is arranged to detect the preset sand deposition height, and the sand deposition position sensor, the electric rotating shaft, the limiting device and the sub-control system are electrically connected.

[0015] Preferably, the limiting device is an electric telescopic rod, and the material receiving roller is provided with a bushing, when the sand deposition position on the filter screen is lowered to the preset initial height, the electric telescopic rod in the limiting device is clamped into the bushing.

[0016] Preferably, a first water suction head is arranged on one side of the first water suction pipe close to the water collecting pit, and a second water suction head is arranged on one side of the second water suction pipe close to the water collecting pit, and the first water suction head and the second water suction head are both variable-diameter bodies.

[0017] The beneficial effects of the system are as follows:

[0018] In the system, the water collecting pit drainage pump house arranged in the metro shield section connecting passage is cancelled, and the drainage equipment is separated from the water collecting pit, so that the construction risk of the metro shield section connecting passage is reduced, and the full mechanization construction of the shield section connecting passage is realized; in addition, the system introduces a new self-suction system and a pipeline system, the self-suction system comprises two sets of self-suction devices, the two sets of self-suction devices are controlled according to the control strategy of one standby and two simultaneous starting of drainage in normal times and in case of accident, the interval drainage function in different scenes is realized, and the reliable operation of the equipment is ensured. In addition, since the self-suction system is arranged in the connecting passage, it is convenient to arrange the drainage equipment in the track area, and it is also convenient to maintain the equipment later.

[0019] Other features and advantages of the present application will be described in the following specification, and some will become apparent from the specification, or will be understood by those skilled in the art from the specification, or will be understood by those skilled in the art from the implementation of the present application. The purpose and other advantages of the present application can be achieved and obtained by the structure specially pointed out in the written specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, based on the embodiments in the present application, all other embodiments obtained without creative labor are within the scope of protection of the present application.

[0021] Figure 1 The figure is a schematic diagram of the overall structure of the subway section drainage system described in the embodiments of the present application.

[0022] Figure 2 The figure is a schematic diagram of the drainage structure in the single-side line of the subway in the embodiments of the present application.

[0023] Figure 3 The figure is a schematic diagram of the structure of the first cam pump and the controller described in the embodiments of the present application.

[0024] Figure 4 The figure is a schematic diagram of the structure of the filter screen replacement device described in the embodiments of the present application.

[0025] Markings in the figure:

[0026] 10, connecting passage; 11, first cam pump; 12, controller; 13, second cam pump; 14, double power supply switching box; 21, first water suction pipe; 211, first electric valve; 212, second electric valve; 213, first water suction head; 22, second water suction pipe; 221, third electric valve; 222, fourth electric valve; 223, second water suction head; 23, water lifting main pipe; 31, first water collecting pit; 32, second water collecting pit; 5, sand settling tank; 61, mounting base body; 62, material receiving roller; 63, material discharging roller; 64, limiting device; 65, sand setting position sensor; 100, first line; 200, second line. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings. Meanwhile, in the description of the utility model, the terms "first", "second", and the like are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0029] Embodiment one:

[0030] As shown in a subway section drainage system, comprising: Figures 1 to 3 The self-suction system is arranged in the communication passage 10, and the self-suction system comprises a first self-suction device and a second self-suction device, the first self-suction device comprises a first cam pump 11 and a controller 12, and the second self-suction device comprises a second cam pump 13 and a double power switching box 14; and

[0031] The pipeline system comprises a first water suction pipe 21, a second water suction pipe 22 and a water lifting main pipe 23, the first water suction pipe 21 is provided with a first electric valve group, the second water suction pipe 22 is provided with a second electric valve group, the first water suction pipe 21 is used for connecting the first self-suction device with a sump in a preset subway line, the second water suction pipe 22 is used for connecting the second self-suction device with the sump in the preset subway line, and the water lifting main pipe 23 is used for discharging the wastewater lifted by the first cam pump 11 and the second cam pump 13 after being combined, and the first cam pump 11, the second cam pump 13, the double power switching box 14, the first electric valve group, the second electric valve group and the controller 12 are electrically connected.

[0032] For the same line, the first self-suction device and the second self-suction device can be controlled according to the control strategy of one in normal times and one in standby, and two simultaneously starting drainage in an accident, so as to realize the section drainage function in different scenes and guarantee the reliable operation of the equipment. In one in normal times and one in standby, the first self-suction device and the second self-suction device realize the periodic rotation and alternating operation function (two are mutual standby and alternating operation) through the controller 12, so as to effectively avoid the working condition that a single device is long-term operated and the other device is long-term not operated.

[0033]

[0034] ​The controller 12 can be configured with a frequency converter. The drainage system can realize variable frequency drainage function according to the liquid level of the sump and different drainage capacity, improve the adaptability of the system to the change of drainage working condition, and reduce the risk of water hammer caused by long distance laying of the water lifting main. At the same time, combined with the electric valve group, the one integrated self-suction device can realize the working condition requirement of suctioning water from two tunnels at different times. The existing submersible pump drainage scene is single and cannot be well combined with the frequency converter.

[0035] The dual power switching box 14 realizes reliable fire load power supply for the first self-suction device and the second self-suction device to meet the power distribution demand of the overall structure in the fire accident state.

[0036] In the system, when the controller 12, the dual power switching box 14 and the corresponding cam pump are integrated, not only the management and maintenance of the equipment are facilitated, but also the space utilization is optimized. This method has more advantages than the conventional split independent installation and is more suitable for the narrow installation requirement of the connecting passage 10.

[0037] The first water suction pipe 21 and the second water suction pipe 22 can be pressure drainage pipes made of 316L stainless steel, with a pipe diameter not less than DN65 and a flange connection interface. The water lifting main 23 can be a pressure drainage pipe made of 316L stainless steel, with a pipe diameter not less than DN150 and a flange connection interface. The water lifting main 23 can collect and lift various types of wastewater in the section and then access the adjacent station wastewater pool, which can effectively reduce the pipeline resistance and lifting height, reduce the pump head and power, and further reduce the system energy consumption and maintenance management workload.

[0038] To clearly define the specific working structure of the preset subway line and the local subway section drainage system, the preset subway line includes a first line 100 and a second line 200. The first sump 31 is arranged on the drainage ditch of the first line 100, and the second sump 32 is arranged on the drainage ditch of the second line 200.

[0039] The first water suction pipe 21 comprises a first water suction unit and a second water suction unit, the second water suction pipe 22 comprises a third water suction unit and a fourth water suction unit, the first electric valve group comprises a first electric valve 211 and a second electric valve 212, the second electric valve group comprises a third electric valve 221 and a fourth electric valve 222, the first water suction unit is used for connecting the first self-suction device with the first water sump 31, and the first electric valve 211 is arranged on the first water suction unit, the second water suction unit is used for connecting the first self-suction device with the second water sump 32, and the second electric valve 212 is arranged on the second water suction unit, the third water suction unit is used for connecting the second self-suction device with the first water sump 31, and the third electric valve 221 is arranged on the third water suction unit, and the fourth water suction unit is used for connecting the second self-suction device with the second water sump 32, and the fourth electric valve 222 is arranged on the fourth water suction unit. In this structure, the first self-suction device and the second self-suction device can realize the suction of the water sumps of different lines, and in specific engineering practice, different self-suction devices can be selected for work according to the liquid levels of the water sumps in different lines.

[0040] Preferably, when the liquid level of the first water sump 31 in the first line 100 reaches the preset position, and the liquid level of the second water sump 32 in the second line 200 does not reach the preset position, the first electric valve 211 on the first water suction unit is opened, and the second electric valve 212 on the second water suction unit is self-locked, so as to ensure the efficient operation of the first cam pump 11 and avoid the double-line operation of the first cam pump 11.

[0041] When the liquid level of the first water sump 31 in the first line 100 reaches the preset position, and the liquid level of the second water sump 32 in the second line 200 also reaches the preset position, the first electric valve 211 on the first water suction unit is opened, the second electric valve 212 on the second water suction unit is self-locked, the fourth electric valve 222 on the fourth water suction unit is opened, and the third electric valve 221 on the third water suction unit is self-locked, so as to ensure the efficient operation of the first cam pump 11 and the second cam pump 13 and avoid the double-line operation of the first cam pump 11 and the second cam pump 13.

[0042] In addition, the first water suction unit, the second water suction unit, the third water suction unit and the fourth water suction unit can be connected according to the uplink and downlink of the subway line. The uplink is that the north-south line should take the south-to-north direction as the uplink direction and the north-to-south direction as the downlink direction, the east-west line should take the west-to-east direction as the uplink direction and the east-to-west direction as the downlink direction, and the loop line should take the running direction of the train on the outer track line as the uplink direction and the running direction of the inner track line as the downlink direction.

[0043] In the local subway section drainage system, in order to realize the linkage of the self-suction system according to the liquid level position in the sump, a liquid level sensor is arranged in the sump in the preset subway line, the first cam pump 11 is provided with a first pump starting liquid level, the second cam pump 13 is provided with a second pump starting liquid level, and the second pump starting liquid level is higher than the first pump starting liquid level, and the liquid level sensor, the double power switching box 14 and the controller 12 are electrically connected. Further, the liquid level sensor can adopt a differential pressure liquid level sensor. The differential pressure liquid level sensor has stable structure and is suitable for the working condition requirements and environmental conditions of the local subway section drainage system.

[0044] Further, the first pump starting liquid level can correspond to the daily state of excluding section seepage and flushing wastewater, and the water quantity is small, and the highest water level is lower than the track bed surface by 100 mm. The second pump starting liquid level corresponds to the fire-fighting and other accident states, and mainly excludes the fire-fighting and other accident wastewater of the uplink and downlink sections, and the water quantity is large, and the highest water level is allowed to be higher than the track bed surface by 150 mm.

[0045] In the structure, the liquid level sensor is used for real-time detection of the sump liquid level in the preset subway line; when the liquid level sensor detects that the sump liquid level in the preset subway line reaches the first pump starting liquid level, the liquid level sensor sends an electric signal, and the first self-suction device works; in this structure, when a one-use-one-backup drainage scheme is adopted, the first self-suction device and the second self-suction device realize the periodic rotation and alternate operation function (two are mutually used as backup and are alternately operated) through the controller 12.

[0046] When the liquid level sensor detects that the sump liquid level in the preset subway line reaches the second pump starting liquid level, the liquid level sensor sends an electric signal, and the first self-suction device and the second self-suction device work at the same time.

[0047] In the utility model, in order to prevent sand and stone from directly entering the sump in the preset subway line, a sand trap 5 is introduced, the sand trap 5 is communicated with the sump in the preset subway line, and a filter screen is arranged at the communicated position. In this structure, larger sand and stone particles can be deposited by gravity on one hand, and targeted filtering of sand and stone particles is carried out through the filter screen on the other hand.

[0048] Further, since the drainage system selects a cam pump, the cam pump allows certain impurities and gaseous wastewater to enter the pump body, but in order to avoid the harm of various impurities to the operation of the water pump (such as damage of impurities to the pump cavity and impeller, and cavitation of gas-liquid two-phase flow to the pump cavity and impeller), the filter screen at the communicated position of the sand trap 5 and the sump in the preset subway line filters the particle size value, and the value should be less than the impurity particle size value allowed by the cam pump, at this time, various impurities can be more effectively reduced into the cam pump.

[0049] As Figure 4 When a certain amount of sand impurities remains on the filter screen, the filter screen needs to be replaced in time, therefore, the utility model introduces filter screen replacement device, the filter screen replacement device includes installation base body 61, material receiving cylinder 62, material discharging cylinder 63, limiting device 64 and sub-control system, the material receiving cylinder 62 is provided with electric rotating shaft, the electric rotating shaft, the limiting device 64 with the sub-control system electricity is connected, the material receiving cylinder 62 rotation is connected in the bottom of installation base body 61, the material discharging cylinder 63 rotation is connected in the top of installation base body 61, the limiting device 64 is set up in the circumference of material receiving cylinder 62, when the sand deposit position on the filter screen reaches the preset sand deposit height, the electric rotating shaft of material receiving cylinder 62 is rotated under the drive of sub-control system, until the sand deposit position on the filter screen reduces to the preset initial height, the limiting device 64 is positioned to the material receiving cylinder 62.

[0050] In the filter screen replacement device, to realize the linkage replacement of filter screen according to sand deposit height, introduce sand deposit position sensor 65, the sand deposit position sensor 65 is used to detect preset sand deposit height, and the sand deposit position sensor 65, the electric rotating shaft, the limiting device 64 with the sub-control system electricity is connected. In this structure, when the sand deposit position reaches the preset sand deposit height, sand deposit position sensor 65 sends electric signal, and the electric rotating shaft is rotated under the control of sub-control system, and the material receiving cylinder is rotated along with the material receiving action of filter screen, when the sand deposit position sensor 65 senses the preset initial height, sand deposit position sensor 65 sends electric signal, and the electric rotating shaft is stopped under the control of sub-control system, and the limiting device 64 is positioned to the material receiving cylinder 62.

[0051] To make clear the specific structure of limiting device 64, the limiting device 64 is electric telescopic rod, and the material receiving cylinder 62 is provided with insertion hole, when the sand deposit position on the filter screen reduces to the preset initial height, the electric telescopic rod in limiting device 64 is inserted into the insertion hole.

[0052] To realize the early warning of water pump running state, the current sensor is arranged on the first cam pump 11 and the second cam pump 13, and the current sensor is electrically connected with the controller 12. The current sensor can be installed on the cam pump body, and the standard current range value when the water pump normally runs is preset, and early warning is carried out when the current value measured by the current sensor exceeds the standard current range value.

[0053] In another aspect, in order to give a warning of the running state from the perspective of water pump vibration, a vibration sensor is arranged on each of the first cam pump 11 and the second cam pump 13, and the vibration sensor is electrically connected with the controller 12. The vibration sensor can be installed on the cam pump body, and a standard vibration range value when the water pump is normally running is preset, and a warning is given when the vibration value measured by the vibration sensor exceeds the standard vibration range value.

[0054] When the current value of the water pump is abnormal or the vibration value is abnormal, the corresponding sensor feeds back a signal to the controller 12, and then the signal is transmitted to the station control room through the BAS system, so that a long-term early warning state of the water pump can be realized, the monitoring level of the drainage system is improved, and a reliable monitoring means is provided for the operation and management of the subway.

[0055] In order to solve the problem of long-term accumulation of wastewater in the sump, a first water suction head 213 is arranged on one side of the first water suction pipe 21 close to the sump, and a second water suction head 223 is arranged on one side of the second water suction pipe 22 close to the sump, and the first water suction head 213 and the second water suction head 223 are both variable-diameter bodies. The introduction of the first water suction head 213 and the second water suction head 223 can control the effective depth of wastewater in the sump. In addition, this structure can solve the uncertain risk brought by the use of steel segments in the shield section pipe without reducing the water suction performance of the water pump.

[0056] In the drainage system, when the interval drainage pump house only bears the interval fire drainage, the fire drainage capacity can be considered as 10 L / s (36 m 3 / h), and a certain amount of structural leakage water and flushing wastewater is considered, and the total drainage capacity is controlled at 40 m 3 / h. At this time, the drainage capacity of the interval drainage pump station can be reasonably controlled, and the effective water storage volume of the sump can be reduced, and the influence range on the track bed can be reduced.

[0057] Embodiment two:

[0058] A subway interval drainage method uses the above-mentioned subway interval drainage system, which comprises: the first cam pump 11 is provided with a first pump starting liquid level, the second cam pump 13 is provided with a second pump starting liquid level, and the second pump starting liquid level is higher than the first pump starting liquid level;

[0059] When the sump in the preset subway line reaches the first pump starting liquid level, the controller 12 controls the first cam pump 11 and the first electric valve group to work, so that the wastewater in the sump is sequentially discharged through the first water suction pipe 21 and the water lifting main pipe 23;

[0060] When the sump in the preset subway line reaches the second pump starting liquid level, the first cam pump 11, the first electric valve group, the second cam pump 13 and the second electric valve group are controlled by the controller 12 to work, so that the wastewater in the sump is sucked through the first water suction pipe 21 and the second water suction pipe 22 and finally discharged through the water lifting main pipe 23.

[0061] To clarify the linkage process of the liquid level sensor and the local subway section drainage system, the liquid level sensor is used to detect the liquid level of the sump in the preset subway line in real time.

[0062] When the liquid level sensor detects that the liquid level of the sump in the preset subway line reaches the first pump starting liquid level, the liquid level sensor sends an electric signal, and the controller 12 controls the first cam pump 11 and the first electric valve group to work, so that the wastewater in the sump is discharged through the first water suction pipe 21 and the water lifting main pipe 23 in turn.

[0063] When the liquid level sensor detects that the liquid level of the sump in the preset subway line reaches the second pump starting liquid level, the liquid level sensor sends an electric signal, and the controller 12 controls the first cam pump 11, the first electric valve group, the second cam pump 13 and the second electric valve group to work, so that the wastewater in the sump is sucked through the first water suction pipe 21 and the second water suction pipe 22 and finally discharged through the water lifting main pipe 23.

[0064] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0065] The above is only the specific implementation method of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A subway section drainage system, characterized by, The utility model relates to a subway water pumping system, which comprises: a self-suction system arranged in a communication passage (10), the self-suction system comprising a first self-suction device and a second self-suction device, the first self-suction device comprising a first cam pump (11) and a controller (12), and the second self-suction device comprising a second cam pump (13) and a double power switch box (14); and a pipeline system comprising a first water suction pipe (21), a second water suction pipe (22) and a water lifting main pipe (23), the first water suction pipe (21) being provided with a first electric valve group, the second water suction pipe (22) being provided with a second electric valve group, the first water suction pipe (21) being used to connect the first self-suction device with a sump in a preset subway line, the second water suction pipe (22) being used to connect the second self-suction device with a sump in a preset subway line, and the water lifting main pipe (23) being used to discharge the wastewater lifted by the first cam pump (11) and the second cam pump (13) after being combined, the first cam pump (11), the second cam pump (13), the double power switch box (14), the first electric valve group, the second electric valve group and the controller (12) being electrically connected.

2. The subway section drainage system according to claim 1, characterized in that, The preset subway line comprises a first line (100) and a second line (200), a first sump (31) is arranged on a drainage ditch of the first line (100), and a second sump (32) is arranged on a drainage ditch of the second line (200); the first water suction pipe (21) comprises a first water suction unit and a second water suction unit, the second water suction pipe (22) comprises a third water suction unit and a fourth water suction unit, the first electric valve group comprises a first electric valve (211) and a second electric valve (212), the second electric valve group comprises a third electric valve (221) and a fourth electric valve (222), the first water suction unit is used to connect the first self-suction device with the first sump (31), the first electric valve (211) is arranged on the first water suction unit, the second water suction unit is used to connect the first self-suction device with the second sump (32), the second electric valve (212) is arranged on the second water suction unit, the third water suction unit is used to connect the second self-suction device with the first sump (31), the third electric valve (221) is arranged on the third water suction unit, the fourth water suction unit is used to connect the second self-suction device with the second sump (32), and the fourth electric valve (222) is arranged on the fourth water suction unit.

3. The subway section drainage system according to claim 1, characterized in that, A liquid level sensor is arranged in the sump in the preset subway line, the first cam pump (11) is provided with a first pump starting liquid level, the second cam pump (13) is provided with a second pump starting liquid level, the second pump starting liquid level is higher than the first pump starting liquid level, and the liquid level sensor, the double power switch box (14) and the controller (12) are electrically connected.

4. The subway section drainage system according to claim 3, characterized in that, Current sensors are arranged on the first cam pump (11) and the second cam pump (13), and are electrically connected with the controller (12).

5. The subway section drainage system according to claim 3, characterized in that, Vibration sensors are arranged on the first cam pump (11) and the second cam pump (13), and are electrically connected with the controller (12).

6. The subway section drainage system according to claim 1, characterized in that, The sand trap (5) is communicated with the water sump in the preset subway line, and a filter screen is arranged at the communicated position.

7. The subway section drainage system according to claim 6, characterized in that, The filter screen replacing device comprises a mounting base (61), a material receiving roller (62), a material discharging roller (63), a limiting device (64) and a sub-control system, the material receiving roller (62) is provided with an electric rotating shaft, the electric rotating shaft, the limiting device (64) and the sub-control system are electrically connected, the material receiving roller (62) is rotationally connected to the bottom of the mounting base (61), the material discharging roller (63) is rotationally connected to the top of the mounting base (61), and the limiting device (64) is arranged in the circumferential direction of the material receiving roller (62), when the sand deposition position on the filter screen reaches the preset sand deposition height, the sub-control system drives the electric rotating shaft of the material receiving roller (62) to rotate until the sand deposition position on the filter screen is lowered to the preset initial height, and the limiting device (64) limits the material receiving roller (62).

8. The subway section drainage system according to claim 7, characterized in that, The sand deposition position sensor (65) is arranged for detecting the preset sand deposition height, and the sand deposition position sensor (65), the electric rotating shaft, the limiting device (64) and the sub-control system are electrically connected.

9. The subway section drainage system according to claim 7, characterized in that, The limiting device (64) is an electric telescopic rod, and the material receiving roller (62) is provided with a jack, when the sand deposition position on the filter screen is lowered to the preset initial height, the electric telescopic rod in the limiting device (64) is clamped into the jack.

10. The subway section drainage system according to claim 1, characterized in that, A first water suction head (213) is arranged on one side of the first water suction pipe (21) close to the water sump, and a second water suction head (223) is arranged on one side of the second water suction pipe (22) close to the water sump, and the first water suction head (213) and the second water suction head (223) are both variable-diameter bodies.

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