A drainage device and drainage method for preventing backflow in urban subway

Abstract

The present invention and the technical field of urban subway drainage specifically relate to an anti-backflow drainage device and drainage method for urban subways. The device includes a side retaining wall, a stepped structure, an air bag and a rainwater monitoring system. The side retaining wall is located at the entrance and exit of the subway station, and the side retaining wall is connected to the side wall at the entrance and exit of the subway station. A pedestrian passage for passengers is provided between a pair of side retaining walls. Side grooves for accommodating air bags are provided on the inner side of the side retaining wall and the upper platform. By using an inflated pop-up air bag, when the rainfall increases suddenly and the monitor receives water level information reaching the specified water level line, the air bag pops up and expands to form a water retaining structure, which blocks rainwater on the outside of the subway station entrance and exit, protects the internal structure of the subway station, and prevents rainwater from backflowing. The rainwater monitoring system has a high degree of automation and does not require human intervention, which saves manpower and material resources, improves the drainage facilities at the entrance and exit of the subway station, is convenient and quick to use, has a wide range of applications, and improves the safety of subway station operation.

Description

Technical Field

[0001] The invention relates to the technical field of urban subway drainage, and in particular to an urban subway backflow prevention drainage device and a drainage method. Background Art

[0002] At present, the entrances and exits of subway stations are mostly flush with the road surface, and drainage is carried out by drainage wells and grille structures. During heavy rains, foreign objects such as plastic bags flow into the drainage outlets along with the water formed by the accumulation of rainwater, which can easily block the drainage facilities at the entrances and exits of subway stations, causing some rainwater to flow back into the subway stations, thus affecting the normal operation of the subways. As a result, it is necessary to further improve the drainage system at the entrances and exits of urban subways to avoid frequent safety problems in urban subways.

[0003] After searching, Chinese patent document CN212614426U discloses a subway platform flood prevention water retaining plate. The water retaining plate includes a subway platform entrance and a flood prevention plate. Flood prevention plate clamps are installed on the inner side of the clamping cavity provided on both sides of the platform entrance. The flood prevention plate includes a waterproof plate, a protruding plate, a first matching plate and a second matching plate. The water retaining plate can perform compression and sealing treatment on the contact point at the edge of the subway station entrance through the cooperation between the clamping plate, the slider, the rotating rod, the adjusting plate and the support rod in the clamping structure, thereby reducing the amount of water leakage at the contact point at the edge. The water retaining plate is reasonably designed, the length of the water retaining plate can be adjusted when necessary, and it is convenient to assemble multiple groups.

[0004] However, in the case of a sudden increase in rainfall, in order to prevent rainwater from flowing back into the subway entrance, a large number of manpower is needed to implement the assembly. This is not only time-consuming and labor-intensive, but also causes a lag in emergency rescue.

[0005] For another example, Chinese patent document CN214118014U discloses a flexible rapid flood-proof water retaining plate device for preventing rainwater backflow in subways. The device includes a base with a water retaining plate accommodating groove, a water retaining plate horizontally placed in the water retaining plate accommodating groove of the base and capable of being flipped to a vertical state for water retaining. The front side edge of the flexible water retaining connecting plate is fixed to the front side edge of the upper end surface of the base, and the rear side edge thereof is fixed to the front side edge of the upper plate surface of the water retaining plate. At least one support plate is installed on the lower plate surface of the water retaining plate for supporting the water retaining plate when flipped to a vertical state.

[0006] Although the above-mentioned water retaining plate device is installed on the ground of subway entrances and exits or at the threshold of subway entrances and exits, and is connected to the subway facilities as a whole, it can be used as a general passage at ordinary times, which is beneficial to improving the space utilization efficiency of the subway. However, the device has a low degree of automation and lacks emergency autonomy when rainwater backflows.

[0007] To sum up, in the process of urban subway drainage treatment, how to design a drainage device to improve the drainage facilities at the entrances and exits of subway stations, improve the degree of automation of emergency drainage treatment, prevent rainwater from backflowing into subway stations, and thus improve the safety of subway station operation has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0008] The purpose of the present invention is to provide a drainage device for urban subway drainage treatment, so as to improve the drainage facilities at the entrances and exits of subway stations, increase the degree of automation of emergency drainage treatment, prevent rainwater from backflowing into subway stations, and thus improve the safety of subway station operation.

[0009] To achieve the above object, the present invention adopts the following scheme: a drainage device for preventing backflow in urban subways is proposed, comprising a side retaining wall, a stepped structure, an air bag and a rainwater monitoring system;

[0010] The side retaining wall is located at the entrance and exit of the subway station, and the side retaining wall is connected to the side wall at the entrance and exit of the subway station. A pair of side retaining walls are arranged opposite to each other, and a pedestrian passage for passengers to pass through is provided between the pair of side retaining walls. A side groove for accommodating an airbag is provided on the inner side of the side retaining wall;

[0011] The step structure is located outside the entrance and exit of the subway station, the step structure is connected to the pedestrian passage, the step structure includes a bottom step and an upper platform, one end of the upper platform extends into the pedestrian passage, a bottom groove for accommodating an airbag is provided on the upper platform, the bottom groove and a pair of side grooves form a U-shaped structure, a first water inlet is provided on the bottom step, a second water inlet is provided on the upper platform, and the bottom of the first water inlet is connected to the bottom of the second water inlet through a connecting pipe;

[0012] The airbag is embedded in a U-shaped structure formed by a side groove and a bottom groove, and the inflation end of the airbag is connected to an inflation device through a pipeline;

[0013] The rainwater monitoring system comprises a monitor, a first water level gauge and a second water level gauge, wherein the first water level gauge and the second water level gauge are both embedded in a connecting pipe, the first water level gauge is located at one end of the connecting pipe close to the first water inlet, the second water level gauge is located at one end of the connecting pipe close to the second water inlet, the position of the first water level gauge is lower than the position of the second water level gauge, the first water level gauge and the second water level gauge are both connected to the input end of the monitor, and the control end of the inflation device is connected to the output end of the monitor;

[0014] Among them, when the water level line in the connecting pipe reaches the first water level gauge, the first water level gauge transmits the detected first water level information to the monitor, and the monitor drives the inflation device to inflate the airbag; when the water level line in the connecting pipe reaches the second water level gauge, the second water level gauge transmits the detected second water level information to the monitor, and the monitor drives the inflation device to stop inflating the airbag, and pops out the airbag into the pedestrian passage to form a water retaining structure.

[0015] Preferably, a drainage trough is provided on the platform, and a water storage tank is connected to the bottom of the drainage trough. In this way, the drainage trough is used to form a water retaining structure after the airbag is popped out and expanded to block rainwater, and further improve the drainage efficiency of the platform to prevent rainwater from flowing back into the subway station through the pedestrian passage. The water storage tank is used to collect rainwater, which is convenient for draining rainwater into an underground storage tank or into a drainage pump station, and is reused for urban irrigation through drip irrigation and sprinkler irrigation, thereby improving the collection and utilization rate of rainwater.

[0016] Preferably, the first water level meter is connected to the input end of the monitor via a first signal connection line, and the second water level meter is connected to the input end of the monitor via a second signal connection line. In this way, the first signal connection line and the second signal connection line are conducive to improving the stability of water level information transmission and avoiding the airbag from being accidentally ejected.

[0017] Preferably, a first water level line and a second water level line are provided in the connecting pipe, the first water level line is located at one end of the connecting pipe close to the first water inlet, the detection end of the first water level gauge is flush with the first water level line, and the second water level line is located at one end of the connecting pipe close to the second water inlet, the detection end of the second water level gauge is flush with the second water level line. With such a configuration, the first water level line and the second water level line serve as positioning references for the installation of the first water level gauge and the second water level gauge, respectively, which facilitates the installation of the first water level gauge and the second water level gauge, and is beneficial to the layout and debugging of the first water level gauge and the second water level gauge.

[0018] Preferably, the water retaining structure formed by the expansion of the airbag is U-shaped, the middle part of the U-shape is an emergency escape passage, and the airbag is a transparent airbag. With such a configuration, the bottom and side walls of the U-shaped airbag both play a role in blocking rainwater, preventing rainwater from flowing back into the subway station, and the emergency escape passage in the middle of the U-shape is used for trapped people in the subway station to quickly escape after the airbag forms a hydrophobic drainage.

[0019] Preferably, the output end of the monitor is connected to a buzzer for sounding an alarm, the first water level meter transmits the detected first water level information to the monitor, and the monitor drives the buzzer to sound an alarm. This arrangement is conducive to the rainwater monitoring system to issue an early warning to people entering and leaving the subway station at the beginning of a rainstorm, thereby ensuring the safety of people.

[0020] Preferably, the mounting base of the monitor is connected to the side retaining wall, and the position of the monitor is higher than the top of the side groove. This arrangement is conducive to avoiding interference between the airbag and the monitor when it is deployed, and at the same time avoids damage to the monitor by rain, thereby improving the stability of the operation of the entire rain monitoring system.

[0021] Preferably, the staircase structure is a three-layer staircase, the bottom step is connected to the upper platform through the middle step, the bottom step is connected to the ground, and the height of the bottom step, the height of the middle step and the height of the upper platform are all equal. With this arrangement, the three-layer staircase structure not only facilitates people's travel, but also raises the height difference of the subway station entrance and exit relative to the ground. The staircase structure uses the height difference to form a partition for rainwater, thereby further preventing rainwater from flowing back into the subway station.

[0022] As a preferred embodiment, a slope is arranged on the side of the step structure, the bottom of the slope is connected to the ground, and the top of the slope is connected to the upper platform. In this way, the slope is used to facilitate disabled people to pass through the step structure, which embodies a humanized design.

[0023] The present invention also proposes a drainage method using the above-mentioned urban subway anti-backflow drainage device, comprising:

[0024] Step 1: According to the rainstorm weather information, turn on the rain monitoring system and supply power to the inflation device;

[0025] Step 2: At the beginning of a rainstorm, rainwater accumulates on the ground and gradually covers the bottom step. The collected water flows into the connecting pipe through the first water inlet on the bottom step, causing the water level in the connecting pipe to rise continuously. The first water level gauge detects the first water level information and transmits the first water level information to the monitor, which drives the inflation device to inflate the airbag.

[0026] Step 3. As the rainfall increases, the water level in the connecting pipe reaches the second water level gauge. The second water level gauge detects the second water level information and transmits the second water level information to the monitor. The monitor drives the inflation device to stop inflating the airbag and pops out the airbag into the pedestrian passage to form a water retaining structure.

[0027] Compared with the prior art, the urban subway anti-backflow drainage device and drainage method provided by the present invention have the following outstanding substantial features and significant improvements:

[0028] 1. The anti-backflow drainage device of the city subway uses an inflatable pop-up airbag. When the rainfall increases suddenly and the monitor receives water level information reaching the specified water level, the airbag pops up and expands to form a water retaining structure, blocking the rainwater outside the subway station entrance and exit, protecting the internal structure of the subway station and preventing rainwater backflow. The rainwater monitoring system has a high degree of automation and does not require human intervention, realizing the intelligent operation of the system, saving manpower and material resources, improving the drainage facilities at the subway station entrance and exit, and is convenient and fast to use, with a wide range of applications, and improving the safety of subway station operation;

[0029] 2. The air bag materials used in the city subway anti-backflow drainage device are all commonly used materials in urban construction. The raw materials are widely available and easy to obtain, which reduces the production cost. The principle is simple, easy to implement, and highly operable.

[0030] 3. The stepped structure of the anti-backflow drainage device of the city subway makes the upper platform higher than the ground, effectively preventing rainwater backflow. Combined with the rainwater monitoring system, when the rainwater reaches a certain water level, the inflatable device is driven to inflate the airbag to achieve the purpose of automatic pop-up of the airbag, which plays the role of drainage and further prevents rainwater backflow;

[0031] 4. The connecting pipe connecting the first water inlet and the second water inlet in the anti-backflow drainage device of the urban subway uses the principle of a communicating vessel to realize the segmented triggering of the inflation action and the ejection action of the airbag, which is more suitable for the existing subway station entrances and exits;

[0032] 5. After the rainwater is cut off, the anti-backflow drainage device of the urban subway can be used to drain the rainwater to the underground storage tank or drainage pump station in combination with the existing drainage facilities in the city, and then flow into the urban irrigation system. Through micro-irrigation, sprinkler irrigation and other measures, urban greening is improved, and the collection and utilization rate of rainwater is further improved;

[0033] 6. The rainwater monitoring system in the city's subway anti-backflow drainage device is easy to connect with meteorological big data, and the big data system is used to regulate rainwater treatment, thereby strengthening information construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of a drainage device for preventing backflow in urban subways according to an embodiment of the present invention;

[0035] Figure 2 yes Figure 1 A reference diagram of the use status of a drainage device for preventing backflow in urban subways;

[0036] Figure 3 yes Figure 2 A schematic diagram of the internal structure of a drainage device for preventing backflow in urban subways;

[0037] Figure 4 yes Figure 3 A local enlarged schematic diagram of point A in the middle.

[0038] Figure numerals: side retaining wall 1, bottom step 2, upper platform 3, drainage trough 4, side groove 5, bottom groove 6, slope 7, monitor 8, airbag 9, first water inlet 10, second water inlet 11, connecting pipe 12, water tank 13, first water level line 14, second water level line 15. DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0040] like Figure 1-4 The urban subway anti-backflow drainage device shown is used to improve the drainage facilities at the entrances and exits of subway stations, improve the automation level of emergency drainage treatment, and prevent rainwater from backflowing into subway stations. The urban subway anti-backflow drainage device uses an inflatable pop-up airbag. When the rainfall increases suddenly and the monitor receives water level information reaching the specified water level line, the airbag pops up and expands to form a water retaining structure, blocking the rainwater outside the entrance and exit of the subway station, protecting the internal structure of the subway station, and preventing rainwater from backflowing. The rainwater monitoring system has a high degree of automation and does not require human intervention, realizing the intelligent operation of the system, saving manpower and material resources, improving the drainage facilities at the entrances and exits of subway stations, being easy and quick to use, and having a wide range of applications, which improves the safety of subway station operation.

[0041] like Figure 1 As shown, a drainage device for preventing backflow in urban subways includes a side retaining wall 1, a stepped structure, an air bag 9 and a rainwater monitoring system. The side retaining wall 1 is located at the entrance and exit of the subway station. The side retaining wall 1 is connected to the side wall at the entrance and exit of the subway station. A pair of side retaining walls 1 are arranged opposite to each other. There is a pedestrian passage between the pair of side retaining walls 1 for passengers to pass through. A side groove 5 for accommodating the air bag 9 is provided on the inner side of the side retaining wall 1.

[0042] The staircase structure is located outside the entrance and exit of the subway station. The staircase structure is connected to the pedestrian passage. The staircase structure includes a bottom step 2 and an upper platform 3. One end of the upper platform 3 extends into the pedestrian passage. The upper platform 3 is provided with a bottom groove 6 for accommodating the airbag 9. The bottom groove 6 and a pair of side grooves 5 form a U-shaped structure. The bottom step 2 is provided with a first water inlet 10. The upper platform 3 is provided with a second water inlet 11. Figure 3 As shown, the bottom of the first water inlet 10 is connected to the bottom of the second water inlet 11 through a connecting pipe 12. The airbag 9 is embedded in the U-shaped structure formed by the side groove 5 and the bottom groove 6. The inflation end of the airbag 9 is connected to an inflation device through a pipeline. The inflation device is an air pump.

[0043] like Figure 2As shown, the rain monitoring system includes a monitor 8, a first water level gauge and a second water level gauge. The first water level gauge and the second water level gauge are both embedded in a connecting pipe 12. The first water level gauge is located at one end of the connecting pipe 12 close to the first water inlet 10. The second water level gauge is located at one end of the connecting pipe 12 close to the second water inlet 11. The position of the first water level gauge is lower than the position of the second water level gauge. The first water level gauge and the second water level gauge are both connected to the input end of the monitor 8. The control end of the inflation device is connected to the output end of the monitor 8.

[0044] When the water level in the connecting pipe 12 reaches the first water level gauge, the first water level gauge transmits the detected first water level information to the monitor 8, and the monitor 8 drives the inflation device to inflate the airbag 9. Figure 2 As shown, when the water level line in the connecting pipe 12 reaches the second water level gauge, the second water level gauge transmits the detected second water level information to the monitor 8, and the monitor 8 drives the inflation device to stop inflating the airbag 9, and pops out the airbag 9 into the pedestrian passage to form a water retaining structure.

[0045] like Figure 3 As shown, the water retaining structure formed by the expansion of the airbag 9 is U-shaped, the middle part of the U-shape is an emergency escape passage, and the airbag 9 is a transparent airbag. With this arrangement, the bottom and side walls of the U-shaped airbag 9 both play a role in blocking rainwater, preventing rainwater from flowing back into the subway station, and the emergency escape passage in the middle of the U-shape is used for trapped people in the subway station to quickly escape after the airbag 9 forms a drainage system. The transparent airbag makes it easy for pedestrians inside the subway station to observe the changes in the water level outside in real time.

[0046] like Figure 4 As shown, a first water level line 14 and a second water level line 15 are provided in the connecting pipe 12. The first water level line 14 is located at one end of the connecting pipe 12 close to the first water inlet 10. The detection end of the first water level gauge is flush with the first water level line 14. The second water level line 15 is located at one end of the connecting pipe 12 close to the second water inlet 11. The detection end of the second water level gauge is flush with the second water level line 15. With such arrangement, the first water level line 14 and the second water level line 15 respectively serve as positioning references for the installation of the first water level gauge and the second water level gauge, which facilitates the installation of the first water level gauge and the second water level gauge, and is beneficial to the layout and debugging of the first water level gauge and the second water level gauge.

[0047] like Figure 1 As shown, the staircase structure is a three-layer staircase. The bottom step 2 is connected to the upper platform 3 through the middle step. The bottom step 2 is connected to the ground. The height of the bottom step 2, the height of the middle step and the height of the upper platform 3 are all equal. With this arrangement, the three-layer staircase structure not only facilitates people's travel, but also raises the height difference of the subway station entrance and exit relative to the ground. The staircase structure uses the height difference to form a partition for rainwater, thereby further preventing rainwater from flowing back into the subway station.

[0048] Among them, the side of the step structure is provided with a slope 7, the bottom end of the slope 7 is connected to the ground, and the top end of the slope 7 is connected to the upper platform 3. In this way, the slope 7 is used to facilitate the disabled to pass through the step structure, which embodies a humanized design.

[0049] like Figure 1 As shown, a drainage ditch 4 is provided on the platform. Figure 3 As shown, a water storage tank 13 is connected to the bottom of the drainage trough 4. In this way, the drainage trough 4 is used to form a water retaining structure after the airbag 9 pops out and expands to block rainwater, while further improving the drainage efficiency of the platform to prevent rainwater from flowing back into the subway station through the pedestrian passage. The water storage tank 13 is used to collect rainwater, which is convenient for draining rainwater into an underground storage tank or into a drainage pump station, and is reused for urban irrigation through drip irrigation and sprinkler irrigation, thereby improving the collection and utilization rate of rainwater.

[0050] like Figure 2 As shown, the mounting base of the monitor 8 is connected to the side retaining wall 1. The position of the monitor 8 is higher than the top of the side groove 5. Such a setting is conducive to avoiding interference between the airbag 9 and the monitor 8 when it is ejected, and at the same time avoiding damage to the monitor 8 by rainwater, thereby improving the stability of the operation of the entire rainwater monitoring system.

[0051] In order to further improve the emergency timeliness of the rainwater monitoring system, a buzzer that issues an alarm is connected to the output end of the monitor 8. The first water level meter transmits the detected first water level information to the monitor 8, and the monitor 8 drives the buzzer to issue an alarm. This setting is conducive to the rainwater monitoring system to issue an early warning to people entering and leaving the subway station at the beginning of a rainstorm, thereby ensuring the safety of people.

[0052] In order to further improve the stability of the device, the first water level gauge is connected to the input end of the monitor 8 via a first signal connection line. The second water level gauge is connected to the input end of the monitor 8 via a second signal connection line. In this way, the first signal connection line and the second signal connection line are conducive to improving the stability of water level information transmission and avoiding the airbag 9 from being ejected by mistake.

[0053] When used, the urban subway anti-backflow drainage device proposed in the embodiment of the present invention includes the following steps:

[0054] Step 1: According to the rainstorm weather information, turn on the rain monitoring system and supply power to the inflation device;

[0055] Step 2: At the beginning of a rainstorm, rainwater accumulates on the ground and gradually covers the bottom step. The collected water flows into the connecting pipe through the first water inlet on the bottom step, causing the water level in the connecting pipe to rise continuously. The first water level gauge detects the first water level information and transmits the first water level information to the monitor, which drives the inflation device to inflate the airbag.

[0056] Step 3. As the rainfall increases, the water level in the connecting pipe reaches the second water level gauge. The second water level gauge detects the second water level information and transmits the second water level information to the monitor. The monitor drives the inflation device to stop inflating the airbag and pops out the airbag into the pedestrian passage to form a water retaining structure.

[0057] Among them, the first water level gauge and the second water level gauge are both commonly used water level acquisition devices. According to actual needs, mechanical float type, photoelectric float type, bubble type, ultrasonic type or pressure type are selected. For example, the pressure water level gauge measures the pressure value in the connecting pipe and then converts it to obtain water level information.

[0058] An anti-backflow drainage device for urban subways in an embodiment of the present invention utilizes an inflated pop-up airbag. When the rainfall increases suddenly and the monitor receives water level information reaching the specified water level line, the airbag pops up and expands to form a water retaining structure, blocking rainwater outside the entrance and exit of the subway station, protecting the internal structure of the subway station, and preventing rainwater backflow. The rainwater monitoring system has a high degree of automation and does not require human intervention, realizing intelligent operation of the system, saving manpower and material resources, improving the drainage facilities at the entrance and exit of the subway station, being convenient and quick to use, having a wide range of applications, and improving the safety of subway station operation.

[0059] When designing the city subway anti-backflow drainage device, full consideration was given to humanistic care, maximizing convenience for the public and facilitating subway drainage without damaging the internal structure of the subway station itself, giving full play to the functional advantages of each part, reducing manpower and material resources, achieving automation, playing the role of drainage and being easy to implement with a high degree of operability.

[0060] The specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A drainage device for preventing backflow in urban subways, characterized in that: Includes side retaining walls, stepped structures, air bags and rain monitoring systems; The side retaining wall is located at the entrance and exit of the subway station, and the side retaining wall is connected to the side wall at the entrance and exit of the subway station. A pair of side retaining walls are arranged opposite to each other, and a pedestrian passage for passengers to pass through is provided between the pair of side retaining walls. A side groove for accommodating an airbag is provided on the inner side of the side retaining wall; The step structure is located outside the entrance and exit of the subway station, the step structure is connected to the pedestrian passage, the step structure includes a bottom step and an upper platform, one end of the upper platform extends into the pedestrian passage, a bottom groove for accommodating an airbag is provided on the upper platform, the bottom groove and a pair of side grooves form a U-shaped structure, a first water inlet is provided on the bottom step, a second water inlet is provided on the upper platform, and the bottom of the first water inlet is connected to the bottom of the second water inlet through a connecting pipe; The airbag is embedded in a U-shaped structure formed by a side groove and a bottom groove, and the inflation end of the airbag is connected to an inflation device through a pipeline; The rainwater monitoring system comprises a monitor, a first water level gauge and a second water level gauge, wherein the first water level gauge and the second water level gauge are both embedded in a connecting pipe, the first water level gauge is located at one end of the connecting pipe close to the first water inlet, the second water level gauge is located at one end of the connecting pipe close to the second water inlet, the position of the first water level gauge is lower than the position of the second water level gauge, the first water level gauge and the second water level gauge are both connected to the input end of the monitor, and the control end of the inflation device is connected to the output end of the monitor; Among them, when the water level line in the connecting pipe reaches the first water level gauge, the first water level gauge transmits the detected first water level information to the monitor, and the monitor drives the inflation device to inflate the airbag; when the water level line in the connecting pipe reaches the second water level gauge, the second water level gauge transmits the detected second water level information to the monitor, and the monitor drives the inflation device to stop inflating the airbag, and pops out the airbag into the pedestrian passage to form a water retaining structure.

2. The urban subway anti-backflow drainage device according to claim 1 is characterized in that: A drainage trough is arranged on the platform, and a water storage tank is connected to the bottom of the drainage trough.

3. The urban subway anti-backflow drainage device according to claim 2 is characterized in that: The first water level meter is connected to the input end of the monitor via a first signal connection line, and the second water level meter is connected to the input end of the monitor via a second signal connection line.

4. The urban subway anti-backflow drainage device according to claim 1 is characterized in that: A first water level line and a second water level line are arranged in the connecting pipe. The first water level line is located at one end of the connecting pipe close to the first water inlet, and the detection end of the first water level gauge is flush with the first water level line. The second water level line is located at one end of the connecting pipe close to the second water inlet, and the detection end of the second water level gauge is flush with the second water level line.

5. The urban subway anti-backflow drainage device according to claim 1 is characterized in that: The water retaining structure formed by the expansion and popping out of the airbag is in a U shape, the middle part of the U shape is an emergency escape passage, and the airbag is a transparent airbag.

6. The urban subway anti-backflow drainage device according to claim 1 is characterized in that: The output end of the monitor is connected to a buzzer for issuing an alarm. The first water level meter transmits the detected first water level information to the monitor, and the monitor drives the buzzer to issue an alarm.

7. The urban subway anti-backflow drainage device according to claim 1 is characterized in that: The mounting seat of the monitor is connected to the side retaining wall, and the position of the monitor is higher than the top of the side groove.

8. The urban subway anti-backflow drainage device according to claim 1 is characterized in that: The stair structure is a three-layer staircase, the bottom step is connected to the upper platform through the middle step, the bottom step is connected to the ground, and the height of the bottom step, the height of the middle step and the height of the upper platform are all equal.

9. The urban subway anti-backflow drainage device according to claim 1, characterized in that: A slope is arranged on the side of the step structure, the bottom end of the slope is connected to the ground, and the top end of the slope is connected to the upper platform.

10. The drainage method of the urban subway anti-backflow drainage device according to any one of claims 1 to 9, characterized in that: include Step 1: According to the rainstorm weather information, turn on the rain monitoring system and supply power to the inflation device; Step 2: At the beginning of a rainstorm, rainwater accumulates on the ground and gradually covers the bottom step. The collected water flows into the connecting pipe through the first water inlet on the bottom step, causing the water level in the connecting pipe to rise continuously. The first water level gauge detects the first water level information and transmits the first water level information to the monitor, which drives the inflation device to inflate the airbag. Step 3. As the rainfall increases, the water level in the connecting pipe reaches the second water level gauge. The second water level gauge detects the second water level information and transmits the second water level information to the monitor. The monitor drives the inflation device to stop inflating the airbag and pops out the airbag into the pedestrian passage to form a water retaining structure.

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