CN115166832B - Subway tunnel ponding detection evaluation method based on rail backflow dynamic analysis - Google Patents
Subway tunnel ponding detection evaluation method based on rail backflow dynamic analysis Download PDFInfo
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- CN115166832B CN115166832B CN202210840209.3A CN202210840209A CN115166832B CN 115166832 B CN115166832 B CN 115166832B CN 202210840209 A CN202210840209 A CN 202210840209A CN 115166832 B CN115166832 B CN 115166832B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
- B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
- B61K9/08—Measuring installations for surveying permanent way
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/68—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
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Abstract
The invention discloses a subway tunnel ponding detection and evaluation method based on rail backflow dynamic analysis, which specifically comprises the following steps: paving a signal transmitting device and a signal collecting and data transmitting device along the rail, transmitting data to a track ponding warning platform of a dispatching center by the data transmitting device, and judging whether a new circulation path appears in the rail backflow state or not through a received rail detection signal; the method comprises the steps that rail state information detected by a rail line signal detection device is verified by arranging a traction substation feed current sensor, a rail backflow sensor and a drainage station backflow sensor; the system also sends the information to a track ponding warning platform of the dispatching center through a signal sending end to treat and judge whether the accident of track ponding occurs or not, and judges the accident site to make a reasonable decision. The method can effectively solve the problem of the traditional video monitoring technology, and effectively ensure the safe operation of the subway under the action of extreme weather factors.
Description
Technical Field
The invention belongs to the field of electrified rail transit, and particularly relates to a subway tunnel ponding detection and evaluation method based on rail backflow dynamic analysis.
Background
Although the subway line is not exposed outdoors, the subway line is not easily influenced by most climatic factors. However, rainfall still has an influence on subway operation, and particularly when the rainfall exceeds the self drainage capacity of the city, the extreme condition of urban waterlogging and backward flowing of subway lines is easily caused. When a dispatcher does not know, a subway vehicle runs to a wading line section, a train driver can only judge front accumulated water visually to implement braking, but accumulated water in a tunnel is gradually increased due to flood backflow, and the vehicle traction backflow path is also caused to be shorted by the accumulated water, so that the vehicle is powered off, personnel are trapped, and the situation that the flood floods a carriage to cause casualties can also occur in serious cases.
In the process of filling the subway tunnel by the waterlogged flood, the electric control equipment such as a station track circuit and a turnout switch machine on the surface of a ballast bed is affected first. When the ballast bed is submerged by flood, the electric control equipment can generate fault short circuit, so that the train is buckled. In a subway traction power supply reflux system, a train receives electric energy from a traction substation through a pantograph and supplies power to vehicle-mounted electric equipment, and a work grounding device enables most of the electric energy to reflux into the traction substation through a steel rail through contact of a bogie wheel set and the steel rail to form a conductive path. Due to the insulating design of the rails and the ground, only a small part of the rails enter the ground to form a turbulent flow. When the flood peak gradually rises to the position of the steel rail surface, a new path is formed by flood and the ground, and a part of current flows into the ground through the flood, so that the backflow of the traction substation can also dynamically change in the process of flooding the steel rail by the flood.
The method is mainly suitable for conventional tunnel water seepage and water accumulation detection, and can accurately detect the water level, but the detection method can only detect the water accumulation condition near the sensor and can not detect the condition of the whole line, so that the method still can not effectively detect disaster types with large flow, strong destructiveness and wide disaster area in face of urban waterlogging and the like.
In urban rail transit, a direct current traction power supply system is usually connected with a negative bus of a traction substation by adopting a steel rail as a negative reflux conductor. The locomotive is powered by the contact net, current flows back through the steel rail, and flows back to the negative bus of the rectifier group through the return cable. In order to ensure the insulation between the steel rail and the ground, an insulation pad and an insulation fastener are adopted to improve the rail-ground transition resistance, so that current flows back from the steel rail as much as possible, and in addition, in order to further reduce the resistance of a backflow passage, the track flow equalization measure is often adopted in engineering. The up-down track is short-circuited by adopting the current equalizing cable at intervals of the whole line steel rail. Although the rail-ground insulation is arranged, part of the reflux does not flow back to the negative electrode of the traction substation through the steel rail, but flows back to the negative electrode of the traction substation through other paths, a special stray current collecting network is usually arranged below the steel rail, and a fixed current limiting resistor is connected to the negative bus of the traction substation, so that the stray current collected in the current discharging network flows back to the substation.
In a subway power supply reflux system which operates normally, a steel rail is used as a main reflux path, most of traction reflux flows through the steel rail to return to a power substation, a part of traction reflux flows through a drainage network to collect stray current and returns to the traction substation, and other parts of traction reflux still remain, so that a small part of traction current cannot return to the traction substation. When the subway tunnel bursts flood and flows backward, the track circuit on the surface of the ballast bed is short-circuited due to accumulated water, and when the steel rail is submerged with the gradual increase of the accumulated water, a new conduction path is formed between the steel rail and the ground through the accumulated water, so that the backflow which is returned to the traction substation through the steel rail can flow into the ground through the accumulated water, the backflow in the steel rail part is reduced, and the scattered current collected by the drainage network flows back to the traction substation. In addition, in the train operation process, although the traction voltage is constant, the acceleration and the deceleration can lead to the change of traction power, so the traction current is transient, and therefore, when an electric signal is adopted to monitor the steel rail, the reflux ratio is mainly seen, if the condition of suddenly dropping occurs, the change of the insulation performance of the steel rail is indicated, foreign matters invade the steel rail, that is, accumulated water possibly influences the insulation of the steel rail to the ground.
Disclosure of Invention
Aiming at the characteristics of subway traction reflux and the problems existing in subway tunnel ponding detection at present, the system monitoring area is effectively increased, and the stability and the anti-interference capability of the monitoring system in the face of sudden flood conditions are improved. The invention provides a subway tunnel ponding detection and evaluation method based on rail backflow dynamic analysis.
According to the subway tunnel ponding detection evaluation method based on the rail backflow dynamic analysis, a rail state detection device is arranged, namely, a signal transmission device, a signal collection and data transmission device are paved along the rail, the data transmission device transmits data to a dispatching center track ponding warning platform, and whether a new circulation path appears in the rail backflow state is judged through the received rail detection signal; setting a substation current detection device, namely verifying the rail state information detected by the rail line signal detection device by setting a traction substation feed current sensor, a rail backflow sensor and a drainage station backflow sensor; the system also sends the information to a track ponding warning platform of the dispatching center through a signal sending end to treat and judge whether the accident of track ponding occurs or not, and judges the accident site to make a reasonable decision.
The steel rail state detection device and the substation current detection device are used for detecting in real time, transmitting data to a dispatching center track ponding warning platform, uniformly processing the data by the platform, and analyzing whether the track ponding exists or not through a disaster judgment module.
The water level detection device is also provided with a float water level detection device which can accurately judge the water accumulation condition along the tunnel and send the water level information to the track water accumulation warning platform of the dispatching center, and the float water level state information is a direct measurement of the water level information, so that once the dispatching center receives the water accumulation signal detected by the float water level state information, the corresponding treatment can be immediately carried out.
The float water level detection equipment adopts an annular float, and the middle sleeve is provided with a stand column, so that the annular float can move up and down according to the water level, an annular magnet is arranged in the annular float, and the position of the annular magnet is judged through a magnetic sensor in the stand column, so that the water level state is judged. The stand top sets up the warning lamp, represents different water level states through different colours for train driver can know the place ahead subway ponding situation under the not good circumstances of sight situation.
The invention discloses a subway tunnel ponding monitoring system based on rail backflow dynamic analysis, which comprises four parts:
rail condition detection device: the monitoring system is used for sending out a stable monitoring signal and judging the state of the steel rail by collecting the monitoring signal at the other end of the steel rail.
Substation current detection device: the method is used for monitoring the feed of the substation and the ratio of reflux in different modes to total reflux to judge whether the characteristic conforming to the accumulated water of the steel rail occurs or not.
A float water level detection module: and judging whether water accumulation and water accumulation depth exist or not by setting the height of the floater.
Dispatching center track ponding warning platform: the system is used for receiving state information of the steel rail state detection device, the substation current detection device and the float water level detection module, judging which road section is subjected to the fault of tunnel ponding through the disaster judgment module, and sending out an alarm.
Compared with the prior art, the invention has the beneficial technical effects that:
1. compared with the traditional video monitoring method, the method is not limited by dim light in a tunnel, smaller detection range of a monitoring camera and the like, so that the monitoring range is wider, and the allowable working range is wider.
2. The monitoring sensitivity is higher, and because stable alternating current signal detection is adopted, the monitoring signal loss degree is acquired through calculation, whether the phenomenon of steel rail backflow abnormality occurs is judged, the phenomenon that the steel rail backflow is reduced and the backflow of the drainage network is increased is determined through the backflow duty ratio of the traction substation, and therefore the accident of tunnel ponding is determined. The traditional method adopts video signal and image signal processing, so that more information is processed, misinformation, missing report and other phenomena are easy to occur due to distortion, and the method adopts numerical value calculation, so that the reaction is more sensitive, and the detection effect is more real-time.
3. Compared with the traditional water level detection method, the water level warning platform for the track ponding of the dispatching center, which is controlled by the on-site detection and the dispatching center, has the advantages that the awareness of the dispatching center on the water ponding condition along the line is enhanced, so that a dispatcher can confirm the section on which the water ponding occurs on the whole line at the first time, a reasonable driving route is planned for a train in operation, and the driving safety is ensured.
4. The redundant function control method for detecting the float water level is adopted, so that the response capability of the detection system in the face of a disaster is ensured, in addition, the float water level detection device can ensure that communication is not smooth in the disaster of extra-large flood by arranging the warning lamp, and under the condition of poor sight, a train driver can judge the front ponding condition through the warning lamp for detecting the float water level, so that the handling capability of driver personnel to the disaster on site is improved.
Drawings
Fig. 1 is a schematic diagram of subway traction power supply reflux.
Fig. 2 is a schematic diagram of a subway tunnel ponding detection platform.
Fig. 3 is a subway tunnel ponding traction reflux diagram.
Fig. 4 is a structural view of the float water level detecting device.
Fig. 5 is a schematic view of the arrangement of the float device along the line.
Fig. 6 is a flow chart for subway tunnel ponding detection.
Reference numerals are defined as follows:
the system comprises a contact net, a 2-traction substation, a 3-drainage station, a 4-backflow rail, a 5-isolation inductor, a 6-signal transmitting device, a 7-signal collecting and data transmitting device, an 8-substation backflow test terminal block, a 9-backflow coefficient processing platform, a 10-traction substation feeding current sensor, a 11-rail backflow current sensor, a 12-drainage net backflow current sensor, a 13-dispatching center track ponding warning platform, a 14-float water level detection module, a 15-city public power grid, a 16-step-down transformer, a 17-ballast bed, a 18-insulating pad, a 19-main drainage net, a 20-auxiliary drainage net, 21-ponding, a 22-supporting plate, a 23-waterproof power supply interface, a 24-annular float, a 25-annular magnet, a 26-upright post, a 27-warning lamp, a 28-tunnel, 29-ground and a 30-float water level detection device.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and the detailed description.
First, a subway power supply reflux system is described as shown in fig. 1. The subway power supply is generally obtained from the urban public power grid 15, is sent to the traction substation 2 through the step-down transformer 16 and is converted into direct current, and then is supplied to the contact net 1 for use, and the subway reflux system is mainly connected to the negative pole of the traction substation through the reflux steel rail 4 due to the design of the insulating pad 18, then still has partial reflux to enter the ground to form subway vage, the partial current can be collected through the main drainage network 19 under the ballast bed 17, and also can be collected through the auxiliary drainage network 20 of the tunnel wall, and the current collected through the drainage network can be sent back to the negative pole of the traction substation through the drainage station 3.
In the invention, as shown in fig. 2, a subway tunnel ponding detection platform considers the reason that traction current continuously changes in the running process of a train, an alternating current monitoring current is injected into a steel rail to be used as a test signal, a signal collecting device 7 is arranged at the other end of the steel rail to detect the current returned to the signal collecting device through the steel rail and send detection data to a dispatching center track ponding warning platform 13, in addition, the feed current of a traction substation along the line and the current of different backflow modes also need to be monitored, an open loop current sensor is arranged at a traction substation feeder 10, a steel rail backflow line 11 and a drainage network backflow line 12 to detect the backflow size in real time, the backflow proportion of each backflow path is calculated through a backflow coefficient processing platform 9, and the backflow proportion is sent to the dispatching center track ponding warning platform 13 through a sending module. In order to ensure the reliable operation of the monitoring system and ensure that a train driver can observe the water accumulation condition in the running process, the invention designs redundant float water level detection equipment, and sets three water level state detection of no water accumulation, water accumulation submerged to a track bed surface and water accumulation submerged to a rail surface, an information transmitting device is arranged in the equipment, a water level signal is transmitted to a dispatching center warning platform 13 in real time, and a warning lamp is arranged at the top of the equipment, and the three water accumulation states are corresponding to each other in three colors. The driver of the train can judge the ponding condition of the road section in front under the dim sight.
Description of traction reflux when water accumulation accident occurs as shown in fig. 3, when water accumulation accident occurs in a section of steel rail, water accumulation 21 is formed in the area, at this time, because water accumulation enables the steel rail and the ground to be together, part of traction reflux enters the ground through water accumulation, and is collected by drainage networks 19 and 20 and sent to a traction substation, in the process of water accumulation with tracks, the proportion of total reflux of the track reflux is gradually reduced, the proportion of total reflux of the drainage networks is gradually increased, and therefore the water accumulation state along the steel rail can be judged by monitoring the reflux state of the traction substation.
The float water level detection apparatus employed in the present invention is shown in fig. 4. The whole detection equipment is firmly ensured by a support plate 22, a signal transmitting device is arranged in the support plate, a waterproof power interface 23 is arranged outside the detection equipment, a ring-shaped floater 24 made of plastic foam is internally provided with a ring-shaped magnet 25, the ring-shaped floater 24 can move up and down along with the height of a water level in a stand column 26, a magnetic sensor is arranged in the stand column 26 to judge the vertical position of the ring-shaped magnet 25 in the stand column through the magnetic force, so that the height of the water level is judged, and three gears are arranged to enable a warning lamp 27 to display different colors.
The float water level detection device designed in the invention is shown in fig. 5 along the line layout, the float water level detection device 30 is paved at the position of track circuit concentration and tunnel depression, in particular on the ground 29 near one side of the ballast bed 17, the initial position of the float is lower than the surface of the ballast bed 17, and the float can effectively sense the dynamic change of the water accumulation surface in the process of water accumulation of the tunnel 28. And detecting whether the water level exceeds the surface of the ballast bed 17 and the surface of the steel rail 4, and judging the disaster condition.
The invention discloses a subway tunnel ponding detection system based on rail backflow dynamic analysis. The system comprises a contact net, a traction substation, a drainage station and a backflow rail; the section steel rail state alternating current signal detection device comprises an isolation inductor, a signal transmission device and a signal collection and data transmission device; the traction substation backflow detection and data processing and sending platform comprises a substation backflow test terminal table, a backflow coefficient processing platform, a traction substation feed current sensor, a steel rail backflow current sensor 11 and a drainage network backflow current sensor, and in addition, the traction substation backflow detection and data processing and sending platform also comprises a dispatching center track ponding warning platform and a floater water level detection module. The detection flow is shown in fig. 6, when no ponding accident occurs in the tunnel, the signal transmitting device injects alternating current test signals into a section of steel rail and is isolated from the steel rail on one side of the traction substation through the isolation inductor, misoperation of the device caused by signal channeling into the substation is prevented, the signal collecting device receives the alternating current test signals at the other end of the steel rail, the injected current and the received current are transmitted to the ponding warning platform of the dispatching center through the monitoring data transmitting module, the current loss value of the monitoring signals is in the allowable range through calculation, the proportion of the total reflux of the steel rail is not reduced, the proportion of the total reflux of the drainage network is not increased, and the condition that no ponding accident occurs in the section of tunnel is judged.
Claims (4)
1. A subway tunnel ponding detection evaluation method based on rail backflow dynamic analysis is characterized in that a rail state detection device is arranged, namely a signal transmission device (6) and a signal collection and data transmission device (7) are paved along the rail, the data transmission device transmits data to a dispatching center track ponding warning platform (13), and whether a new circulation path appears in the rail backflow state is judged through a received rail detection signal; the method comprises the steps of setting a substation current detection device, namely verifying rail state information detected by a rail line signal detection device through setting a traction substation feed current sensor (10), a rail backflow sensor (11) and a drain station backflow sensor (12); the system also sends the information to a track ponding warning platform of the dispatching center through a signal sending end to process and judge whether the accident of track ponding occurs or not, and judges the accident site to make a reasonable decision;
the steel rail state detection device and the substation current detection device are used for detecting in real time, transmitting data to a dispatching center track ponding warning platform (13), uniformly processing the data by the platform, and analyzing whether track ponding exists or not by a disaster judgment module;
in consideration of the reason that traction current continuously changes in the running process of a train, alternating current monitoring current is injected into a steel rail to serve as a test signal, a signal collecting device (7) is arranged at the other end of the steel rail to detect the current returned to the signal collecting device through the steel rail, detection data are sent to a dispatching center track ponding warning platform (13), in addition, the feed current of a traction substation along the line and the current of different backflow modes also need to be monitored, an open loop current sensor is arranged at a traction substation feeder (10), a steel rail backflow line (11) and a drainage network backflow line (12) to detect the backflow size in real time, the backflow proportion of each backflow path is calculated through a backflow coefficient processing platform (9), and the backflow proportion is sent to the dispatching center track ponding warning platform (13) through a sending module; the device is also provided with float water level detection equipment (30), and is provided with three water level states of no ponding, ponding submerges to the road bed surface and ponding submerges to the rail surface for detection, an information sending device is arranged in the device, a water level signal is sent to a dispatching center warning platform (13) in real time, and warning lamps are arranged at the top of the device, and three ponding states are corresponding to three colors for a train driver to judge the ponding state of a front road section under a dim sight;
when a section of steel rail is subjected to ponding accident, ponding (21) is formed in the area, at this time, because the ponding is used for connecting the steel rail with the ground, a part of traction reflux enters the ground through the ponding, and the traction reflux is collected by drainage networks (19, 20) and sent to a traction substation, so that the proportion of the total reflux of the track reflux in the process of the ponding with the track is gradually reduced, the proportion of the total reflux of the drainage networks is gradually increased, and the state of the ponding along the steel rail can be judged by monitoring the state of the reflux of the traction substation.
2. The subway tunnel ponding detection and evaluation method based on the rail backflow dynamic analysis according to claim 1, wherein the float water level detection equipment (30) accurately judges the ponding state along the tunnel and sends water level information to the dispatching center track ponding warning platform (13) as well, and the float water level state information is a direct measurement of the water level information, so that once the dispatching center receives the water level information, a ponding signal detected from the float water level state information can be processed correspondingly immediately;
the float water level detection device (30) adopts an annular float (24), and the middle sleeve is provided with a stand column (26), so that the annular float (24) can move up and down according to the water level, an annular magnet (25) is arranged in the annular float (24), and the position of the annular magnet (25) is judged through a magnetic sensor in the stand column, so that the water level state is judged.
3. The subway tunnel ponding detection and evaluation method based on the rail backflow dynamic analysis according to claim 2, wherein warning lamps (27) are arranged at the tops of the upright posts (26) and represent different water level states through different colors.
4. Subway tunnel ponding monitoring system based on rail backward flow dynamic analysis, its characterized in that includes four parts:
rail condition detection device: the monitoring system is used for sending out a stable monitoring signal and judging the state of the steel rail by collecting the monitoring signal at the other end of the steel rail;
substation current detection device: the method is used for monitoring the feed of the substation and the ratio of reflux in different modes to total reflux to judge whether the characteristic conforming to the accumulated water of the steel rail appears or not; when no ponding accident occurs in the tunnel, the signal transmitting device injects alternating current test signals into a section of steel rail and is isolated from the steel rail at one side of the traction substation through the isolation inductor, misoperation of the device caused by signal channeling into the substation is prevented, the signal collecting device receives the alternating current test signals at the other end of the steel rail, the injected current and the received current are transmitted to the ponding warning platform of the dispatching center through the monitoring data transmitting module, the current loss value of the monitoring signals is calculated to be in an allowable range, the proportion of the steel rail backflow to the total backflow is not reduced, the proportion of the drainage network backflow to the total backflow is not increased, and the section of tunnel is judged to have no ponding accident;
a float water level detection module: judging whether water accumulation and water accumulation depth exist or not by setting the height of the floater;
dispatching center track ponding warning platform: the system is used for receiving state information of the steel rail state detection device, the substation current detection device and the float water level detection module, judging which road section is subjected to the fault of tunnel ponding through the disaster judgment module, and sending out an alarm.
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