CN114197252B - Ballastless track with base limiting groove monitoring function and health monitoring method thereof - Google Patents
Ballastless track with base limiting groove monitoring function and health monitoring method thereof Download PDFInfo
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- CN114197252B CN114197252B CN202111637518.2A CN202111637518A CN114197252B CN 114197252 B CN114197252 B CN 114197252B CN 202111637518 A CN202111637518 A CN 202111637518A CN 114197252 B CN114197252 B CN 114197252B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 170
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000036541 health Effects 0.000 title claims abstract description 19
- 230000003287 optical effect Effects 0.000 claims abstract description 94
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- 239000004567 concrete Substances 0.000 claims abstract description 23
- 238000010276 construction Methods 0.000 claims description 9
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- 238000012423 maintenance Methods 0.000 claims description 6
- 238000011065 in-situ storage Methods 0.000 claims description 5
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
Abstract
The invention relates to a ballastless track with a base limit groove monitoring function and a health monitoring method thereof, wherein the ballastless track comprises a base plate, a middle layer plate and a track plate which are arranged in a stacked mode, a plurality of limit grooves are formed in the base plate, a plurality of limit bosses are arranged at the bottom of the middle layer plate and are embedded into the limit grooves in a one-to-one correspondence mode, at least part of the limit grooves are internally provided with groove internal stress monitoring optical cables, the groove internal stress monitoring optical cables are fiber grating array stress cables integrated with a plurality of fiber grating stress sensors, and the groove internal stress monitoring optical cables are continuously arranged along the whole circumferential length of the inner wall of the corresponding limit groove and are fixedly connected by concrete of the corresponding limit boss. The invention can continuously monitor the stress conditions such as the stress magnitude, the stress direction, the change trend and the like of the limit groove in real time, and the monitored data has comprehensiveness, richness and real-time effectiveness, thereby being convenient for timely grasping the stress condition of the limit groove of the base plate and the possibility of occurrence of related diseases such as cracks and the like.
Description
Technical Field
The invention belongs to the technical field of rail traffic engineering, and particularly relates to a ballastless track with a base limiting groove monitoring function and a health monitoring method thereof.
Background
The slab ballastless track comprises a steel rail, a fastener, a prefabricated track slab, an intermediate layer plate (mainly comprising self-compacting concrete with reinforced ribs and an intermediate isolation layer (geotextile)) and a reinforced concrete base plate and the like; wherein, CRTS III plate-type ballastless track sets up spacing recess on the bed plate, fills this spacing recess when the self-compaction concrete placement of intermediate lamella to the bed plate can play spacing effect to intermediate lamella and the track board of top. Because the limit groove is influenced by longitudinal and transverse extrusion force of the middle layer plate and the track plate, self temperature stress and the like for a long time, four-corner crack conditions often occur in the construction and operation processes. In order to ensure the working stability and durability of the limiting groove, the stress state of the limiting groove needs to be monitored in real time.
Disclosure of Invention
The invention relates to a ballastless track with a base limiting groove monitoring function and a health monitoring method thereof, which at least can solve part of defects in the prior art.
The invention relates to a ballastless track with a base limit groove monitoring function, which comprises a base plate, a middle layer plate and a track plate which are arranged in a stacked manner, wherein a plurality of limit grooves are formed in the base plate, a plurality of limit bosses are arranged at the bottom of the middle layer plate and are embedded into the limit grooves in a one-to-one correspondence manner, at least part of the limit grooves are internally provided with groove internal stress monitoring optical cables, the groove internal stress monitoring optical cables are fiber bragg grating array stress cables integrated with a plurality of fiber bragg grating stress sensors, and the groove internal stress monitoring optical cables are continuously arranged along the circumferential full length of the inner wall of the corresponding limit groove and are fixedly connected with concrete of the corresponding limit boss.
As one of the implementation modes, the ballastless track further comprises an out-groove monitoring optical cable which is longitudinally arranged along the track and buried in the concrete of the middle laminate, and the out-groove monitoring optical cable is connected with each in-groove stress monitoring optical cable to form a continuous fiber bragg grating array optical cable.
As one of the implementation manners, the out-of-tank monitoring optical cable is arranged at the junction of the middle layer plate and the base plate.
As one of the implementation modes, the in-groove stress monitoring optical cable is arranged at the junction of the limiting boss and the limiting groove.
As one of the implementation manners, the limit groove is a square groove, each corner of the limit groove is provided with two fiber grating stress sensors, and the two fiber grating stress sensors are positioned on two sides of a corner line of the corresponding corner.
The invention also relates to a health monitoring method of the ballastless track, which comprises the following steps:
the stress and strain information is acquired in real time through the in-groove stress monitoring optical cable, the stress and strain information sent by the in-groove stress monitoring optical cable is received through the fiber bragg grating data demodulator, demodulated into a demodulation signal and sent to the background processor;
the background processor analyzes and obtains the stress magnitude and stress direction born by the limiting groove, and judges the structural health condition of the limiting groove so as to guide a working department to timely detect and maintain the ballastless track.
As one embodiment, the method further includes:
during the cast-in-situ construction of the middle layer plate, the stress state of the optical cable in the middle layer plate forming process is monitored through the monitoring of the internal stress of the groove,
and judging whether the quality of the intermediate layer plate meets the requirement according to the stress state in the forming process of the obtained intermediate layer plate so as to guide constructors to perform corresponding maintenance operation on cast-in-place concrete of the intermediate layer plate.
The invention has at least the following beneficial effects:
according to the invention, the fiber bragg grating array stress cables are continuously arranged on the whole circumferential length of the inner wall of the limit groove, so that the stress conditions such as the stress magnitude, the stress direction and the change trend of the limit groove can be continuously monitored in real time, the monitored data has comprehensiveness, richness and real-time effectiveness, the possibility of the stress condition of the limit groove of the base plate and related diseases such as cracks can be conveniently and timely mastered, the health monitoring and maintenance of the ballastless track are facilitated, and the labor intensity and labor cost of railway working departments and the like are reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic longitudinal section view of a ballastless track with a base limiting groove monitoring function provided by an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of a ballastless track with a base limiting groove monitoring function provided by an embodiment of the invention;
fig. 3 is a schematic layout view of a warp deformation monitoring optical cable according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1 and 2, an embodiment of the present invention provides a ballastless track, including a base plate 13, an intermediate layer plate 12 and a track plate 11 that are stacked, where a plurality of limiting grooves 131 are disposed on the base plate 13, and a plurality of limiting bosses are disposed at the bottom of the intermediate layer plate 12 and are embedded in each of the limiting grooves 131 in a one-to-one correspondence manner. The ballastless track of the base plate 13, the middle layer plate 12 and the track plate 11 is of a conventional structure in the field, wherein the middle layer plate 12 is generally of a concrete cast-in-situ structure, for example, is formed by adopting self-compacting concrete for cast-in-situ; typically, the limiting grooves 131 are sequentially spaced apart along the longitudinal direction of the track.
Further, as shown in fig. 1 and 2, at least part of the limiting grooves 131 are internally provided with in-groove stress monitoring optical cables 21, the in-groove stress monitoring optical cables 21 are fiber grating array stress cables integrated with a plurality of fiber grating stress sensors, and the in-groove stress monitoring optical cables 21 are continuously arranged along the circumferential full length of the inner wall of the corresponding limiting groove 131 and are solidified by concrete of the corresponding limiting boss.
The fiber grating array stress cable is a cable with a plurality of fiber grating stress sensors integrated in a single optical cable, is an existing product, has the characteristics of wide monitoring coverage (more than 10km can be covered according to the requirement), high measurement precision, small spacing between sensing units (the minimum spacing can be 1 cm) and the like, and specific structures are not repeated here.
For the above-mentioned monitoring scheme based on the in-groove stress monitoring optical cable 21, a fiber bragg grating data demodulator is generally configured, and is used for receiving the stress-strain information sent by the in-groove stress monitoring optical cable 21, demodulating the stress-strain information into a demodulated signal, and sending the demodulated signal to a background processor. The fiber bragg grating data demodulator is also existing equipment; the connection between the background processor and the background processor can be electric connection or communication connection, which is a conventional technology.
Preferably, the in-slot stress monitoring optical cable 21 is disposed at the junction of the limiting boss and the limiting groove 131, so that the stress condition of the limiting groove 131, including the stress magnitude and the stress direction, can be known more accurately. Further, as shown in fig. 1 and 2, the limiting groove 131 is a square groove, each corner of the limiting groove is provided with two fiber bragg grating stress sensors, and the two fiber bragg grating stress sensors are positioned at two sides of a corner line of the corresponding corner; it will be appreciated that each two adjacent groove walls enclose a corner, the corner line of which is the intersection of the two groove walls; because the stress at the groove corner is more concentrated, the stress condition of the limiting groove 131 can be known more accurately by arranging the fiber bragg grating stress sensor at the groove corner.
It is further preferable that each in-groove stress monitoring optical cable 21 is connected to form a continuous fiber grating array optical cable 2, and accordingly, the ballastless track further includes an out-groove monitoring optical cable 22, the out-groove monitoring optical cable 22 being disposed longitudinally along the track and buried in the concrete of the intermediate layer plate 12, the out-groove monitoring optical cable 22 being connected to each in-groove stress monitoring optical cable 21 to form a continuous fiber grating array optical cable 2. The above-mentioned out-of-tank monitoring optical cable 22 may be laid on the top surface of the base plate 13 and then solidified by the cast-in-place concrete of the intermediate layer plate 12, that is, the out-of-tank monitoring optical cable 22 is arranged at the junction of the intermediate layer plate 12 and the base plate 13. Obviously, it is also possible to embed the out-of-groove monitoring cable 22 at the top of the base plate 13, for example, a longitudinal monitoring groove is formed at the top of the base plate 13 to embed the out-of-groove monitoring cable 22, and when the middle layer plate 12 is poured, the cast-in-place concrete thereof fills the longitudinal monitoring groove.
The internal stress monitoring optical cables 21 in each groove are connected into a whole, so that the full-line continuous monitoring of the ballastless track can be realized, the signal transmission lines of the internal stress monitoring optical cables 21 in each groove are unified, the consistency is high, and the accuracy of the monitoring result can be improved.
For the scheme that the out-of-groove monitoring optical cable 22 and the in-groove stress monitoring optical cable 21 are connected to form the continuous fiber grating array optical cable 2, the fiber grating data demodulators are preferably arranged in a plurality to ensure the accuracy and the reliability of monitoring data in consideration of the fact that the whole line length of the ballastless track is longer. Preferably, each fiber bragg grating data demodulator is used for acquiring monitoring information of two sections of fiber bragg grating array monitoring cables on the front side and the rear side of each fiber bragg grating data demodulator; in one embodiment, two adjacent fiber bragg grating data demodulators are connected in series by a single cable, and in the single cable, a certain point is taken as a demarcation point, a fiber bragg grating sensor at the front side of the demarcation point sends monitoring information to a fiber bragg grating data demodulator at the front side, and a fiber bragg grating sensor at the rear side of the demarcation point sends monitoring information to a fiber bragg grating data demodulator at the rear side, which can be realized through setting the light emitting direction of the fiber bragg grating sensor in the optical cable. Preferably, each station is provided with a fiber grating data demodulator.
The monitoring optical cable 22 outside the groove can be used for signal transmission without a fiber grating sensor; when the fiber bragg grating sensor is also arranged in the out-of-groove monitoring optical cable 22, the further health monitoring of the ballastless track can be realized; the composite fiber grating array optical cable 2 formed by combining the out-of-groove monitoring optical cable 22 and the in-groove stress monitoring optical cable 21 can realize monitoring of various health projects of the ballastless track by a single optical cable, has more abundant monitoring data, and can comprehensively and reliably reflect the health condition of the ballastless track.
In an alternative embodiment, the fiber bragg grating stress sensor is disposed in the out-of-groove monitoring optical cable 22, so that the stress variation condition at the junction of the middle layer plate 12 and the base plate 13 can be correspondingly monitored, the vertical load variation between the base plate 13 and the middle layer plate 12 can be conveniently monitored, the monitoring of interlayer diseases, such as the empty condition monitoring between the base plate 13 and the middle layer plate 12, can be conveniently and timely detected and maintained by a service department and the like.
In an alternative embodiment, the out-of-slot monitoring optical cable 22 is internally provided with a fiber grating vibration sensor, and accordingly a plurality of vibration measuring points are formed at the junction of the middle layer plate 12 and the base plate 13, and vibration acceleration at each vibration measuring point can be obtained; for each vibration measuring point, a vibration acceleration-time relation data set is established, and according to the vibration acceleration of the current time and the vibration acceleration of the historical time, whether interlayer diseases occur at the junction of the middle layer plate 12 and the base plate 13, such as the void diseases between the base plate 13 and the middle layer plate 12, can be judged, so that a working department and the like can timely detect and maintain the ballastless track. In this scheme, the fiber bragg grating data demodulator is preferably a data demodulator capable of demodulating stress strain information and vibration information in a composite manner, and is also an existing device.
In an alternative embodiment, the optical fiber grating temperature sensor is disposed in the out-of-tank monitoring optical cable 22, so that the longitudinal temperature gradient of the base plate 13/middle layer plate 12 can be obtained correspondingly, the longitudinal temperature gradient of the track structure can be reflected to a certain extent, health monitoring of the track structure, especially the monitoring of the void condition between the base plate 13 and the middle layer plate 12 (the void position is different from the temperature load at the normal position), and thus, the detection and maintenance of ballastless tracks by the service departments and the like can be performed timely. In this scheme, the fiber bragg grating data demodulator is preferably a data demodulator capable of demodulating stress strain information and temperature information in a composite manner, and is also an existing device.
The embodiment relates to a health monitoring method of the ballastless track, which comprises the following steps:
the stress and strain information is acquired in real time through the in-groove stress monitoring optical cable 21, the stress and strain information sent by the in-groove stress monitoring optical cable 21 is received through an optical fiber grating data demodulator, demodulated into a demodulation signal and sent to a background processor;
the background processor analyzes and obtains the stress magnitude and stress direction of the limiting groove 131, and judges the structural health condition of the limiting groove 131 so as to guide the service department to detect and maintain the ballastless track in time.
For the case of the out-of-groove monitoring optical cable 22, the related ballastless track health monitoring scheme in the foregoing is related to the setting of the fiber grating sensor in the out-of-groove monitoring optical cable 22, and will not be described herein.
Further, the method further comprises:
during cast-in-place construction of the middle layer plate 12, the stress state in the middle layer plate 12 forming process is monitored through the in-groove stress monitoring optical cable 21, and whether the quality of the middle layer plate 12 meets the requirement or not is judged according to the obtained stress state in the middle layer plate 12 forming process so as to guide constructors to carry out corresponding maintenance operation on cast-in-place concrete of the middle layer plate 12. Wherein, the fiber bragg grating data demodulator can be configured at the corresponding position according to the construction progress of the middle layer plate 12 and connected with the in-groove stress monitoring optical cable 21 for realizing real-time monitoring and data processing. Based on the scheme, the construction quality of the ballastless track can be effectively improved, and the engineering loss and the construction cost are reduced; the fiber bragg grating array optical cable is adopted for corresponding monitoring work, so that the field installation is convenient, the data channels are few, the influence on the concrete structure of the middle plate 12 is small, the data acquisition reliability and accuracy are high, and the monitoring accuracy and reliability are correspondingly improved.
Obviously, when the fiber grating stress sensor is arranged in the out-of-groove monitoring optical cable 22, the control of the construction quality of the middle layer plate 12 can be further improved.
When the fiber bragg grating temperature sensor is arranged in the out-of-groove monitoring optical cable 22, the temperature state of the middle layer plate 12 in the molding process is monitored through the out-of-groove monitoring optical cable 22 during cast-in-situ construction of the middle layer plate 12, and whether the quality of the middle layer plate 12 meets the requirement is judged according to the obtained temperature state of the middle layer plate 12 in the molding process so as to guide constructors to perform corresponding maintenance operation on cast-in-place concrete of the middle layer plate 12.
For the cast-in-place concrete curing operation, for example, the curing temperature of the ballastless track concrete is preferably 10-25 ℃, and when the concrete is constructed in winter, the concrete is timely insulated when the temperature is lower than 5 ℃; when the concrete is constructed in summer, water spraying and cooling are carried out in time when the temperature of the concrete is higher than 30 ℃. After the intermediate deck 12 is poured, various vehicles are strictly prohibited from passing over the intermediate deck 12 until the concrete does not reach 75% of the design strength.
Example two
The ballastless track and the health monitoring method thereof provided by the first embodiment are further optimized.
As shown in fig. 3, the ballastless track is further configured with a track slab buckling deformation monitoring module, the track slab buckling deformation monitoring module comprises at least one group of monitoring units arranged on a track slab 11, the monitoring units comprise two buckling deformation monitoring optical cables, the buckling deformation monitoring optical cables are fiber bragg grating array stress cables integrated with a plurality of fiber bragg grating stress sensors, the two buckling deformation monitoring optical cables in the same group are longitudinally distributed along the track and are arranged at each buckling deformation monitoring point in a high-low mode, and the two buckling deformation monitoring optical cables are arranged in an X-shaped cross mode between two longitudinally adjacent buckling deformation monitoring points.
The fiber bragg grating data demodulator is also used for receiving stress information sent by the warp deformation monitoring optical cable, demodulating the stress information into demodulation signals and sending the demodulation signals to the background processor.
The warp deformation monitoring optical cable is a cable with a plurality of fiber bragg grating stress sensors integrated in a single optical cable, is an existing product, has the characteristics of wide monitoring coverage (more than 10km can be covered according to the requirement), high measurement precision, small spacing between sensing units (the minimum spacing can be 1 cm) and the like, and specific structures are not repeated here.
Preferably, each buckling deformation monitoring optical cable is continuously arranged along the whole length of the track plate 11, so that full-line monitoring of the buckling deformation of the ballastless track plate is realized, and the monitoring result is more accurate and reliable. The number of the monitoring units can be set according to actual conditions, and the reliable monitoring of the buckling deformation of the track plate can be better completed by adopting one group of the monitoring units, and the accuracy of the monitoring result can be further improved by adopting two or more groups of the monitoring units. In one of the embodiments, the monitoring unit is arranged outside the rail.
It can be understood that each warp monitoring point is provided with two fiber bragg grating stress sensors, the two fiber bragg grating stress sensors belong to two warp monitoring optical cables, and one fiber bragg grating stress sensor is positioned above the other fiber bragg grating stress sensor, so that the requirement that the two warp monitoring optical cables in the same group are arranged in a high-low mode at each warp monitoring point is met.
One of the warp monitoring cables is defined as a first warp monitoring cable 311, and the other warp monitoring cable is defined as a second warp monitoring cable 312. As shown in fig. 3, each warp monitoring optical cable is provided with one fiber bragg grating stress sensor at two longitudinally adjacent warp monitoring points, wherein one fiber bragg grating stress sensor is positioned at a high point at one of the warp monitoring points, and the other fiber bragg grating stress sensor is positioned at a low point at the other warp monitoring point, so that the warp monitoring optical cable is obliquely distributed between the longitudinally adjacent two warp monitoring points; thus, among the two longitudinally adjacent warp monitoring points, at the first warp monitoring point, the stress sensor of the first warp monitoring optical cable 311 is located directly above the stress sensor of the second warp monitoring optical cable 312, and at the second warp monitoring point, the stress sensor of the second warp monitoring optical cable 312 is located directly above the stress sensor of the first warp monitoring optical cable 311, and the first warp monitoring optical cable 311 and the second warp monitoring optical cable 312 are arranged in an X-shaped cross arrangement between the two longitudinally adjacent warp monitoring points.
In the embodiment, by adopting the cross arrangement of the two buckling deformation monitoring optical cables, when the buckling deformation monitoring points generate vertical buckling deformation, the two buckling deformation monitoring optical cables generate differential effect, so that the buckling deformation condition can be responded rapidly and intuitively, and the vertical buckling deformation of the track plate can be monitored rapidly and accurately. The optical cable arrangement mode can eliminate the longitudinal displacement change of the track plate caused by external load effects such as temperature and the like, and improves the accuracy and reliability of monitoring the vertical buckling deformation of the track plate.
In one embodiment, each of the warp monitoring optical cables is disposed on the surface of the track slab, so that the warp of the track slab 11 can be rapidly and accurately reflected, and the warp monitoring optical cables are more convenient to arrange, replace and maintain. Further preferably, the monitoring unit further comprises a protective cover 32, and the protective cover 32 is covered on the surface of the track slab and covers the two corresponding warp deformation monitoring optical cables inside, so that the warp deformation monitoring optical cables can be better protected; in one embodiment, the warp monitoring cable is secured within the boot 32, and the boot 32 is secured to the surface of the track slab (which may be secured by fasteners such as expansion screws). Further preferably, the top end of the warp deformation monitoring optical cable does not exceed the height of the rail surface of the steel rail, so that interference with train operation is avoided.
The number and distribution of the buckling deformation monitoring points can be set according to specific conditions. In one embodiment, the track plate 11 comprises a plurality of segment plates which are sequentially arranged along the longitudinal direction of the track, and one buckling deformation monitoring point can be respectively arranged at the front end and the rear end of each segment plate, or the interval between two adjacent buckling deformation monitoring points is the length of one segment plate; optionally, the distance between two adjacent buckling deformation monitoring points is 5-7 m.
Based on the track plate warp deformation monitoring module, the track plate warp deformation monitoring method specifically comprises the following steps:
when the buckling deformation monitoring points generate buckling deformation, the two buckling deformation monitoring optical cables in the same group generate a differential effect, and the monitoring deformation is obtained based on the differential effect;
and eliminating the error deformation on the basis of the monitored deformation to judge the vertical buckling deformation condition of the track plate 11, wherein the error deformation comprises the error deformation of the track plate 11 caused by temperature influence and the error deformation caused by deformation in other directions.
Based on the track slab buckling deformation monitoring scheme, the stress monitoring scheme in the limiting groove in the first embodiment is combined, so that the loading condition of the track slab 11 can be reflected more accurately, and the accuracy of monitoring the ballastless track health is improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The utility model provides a ballastless track with spacing recess monitoring function of base, includes bed plate, intermediate layer board and the track board of range upon range of setting, be equipped with a plurality of spacing recesses on the bed plate, the bottom of intermediate layer board has a plurality of spacing bosss and each spacing boss one-to-one imbeds to each in the spacing recess, its characterized in that: the groove internal stress monitoring optical cable is arranged in at least part of the limiting grooves, is an optical fiber grating array stress cable integrated with a plurality of optical fiber grating stress sensors, is continuously arranged along the whole circumferential length of the inner wall of the corresponding limiting groove and is fixedly connected with the concrete of the corresponding limiting boss.
2. The ballastless track of claim 1, wherein: the optical fiber cable is characterized by further comprising an out-of-groove monitoring optical cable which is longitudinally arranged along the track and buried in the concrete of the middle laminate, and the out-of-groove monitoring optical cable is connected with each in-groove stress monitoring optical cable to form a continuous fiber bragg grating array optical cable.
3. The ballastless track of claim 2, wherein: the out-of-groove monitoring optical cable is arranged at the junction of the middle layer plate and the base plate.
4. The ballastless track of claim 1, wherein: the groove internal stress monitoring optical cable is arranged at the junction of the limiting boss and the limiting groove.
5. The ballastless track of claim 1, wherein: the limiting grooves are square grooves, each corner of each limiting groove is provided with two fiber bragg grating stress sensors, and the two fiber bragg grating stress sensors are located on two sides of a corner line of the corresponding corner.
6. A method for monitoring the health of ballastless tracks with a base limit groove monitoring function as recited in any one of claims 1 to 5, characterized by: the method comprises the following steps:
the stress and strain information is acquired in real time through the in-groove stress monitoring optical cable, the stress and strain information sent by the in-groove stress monitoring optical cable is received through the fiber bragg grating data demodulator, demodulated into a demodulation signal and sent to the background processor;
the background processor analyzes and obtains the stress magnitude and stress direction born by the limiting groove, and judges the structural health condition of the limiting groove so as to guide a working department to timely detect and maintain the ballastless track.
7. The method as recited in claim 6, further comprising:
during the cast-in-situ construction of the middle layer plate, the stress state of the optical cable in the middle layer plate forming process is monitored through the monitoring of the internal stress of the groove,
and judging whether the quality of the intermediate layer plate meets the requirement according to the stress state in the forming process of the obtained intermediate layer plate so as to guide constructors to perform corresponding maintenance operation on cast-in-place concrete of the intermediate layer plate.
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