CN114112001A - Ballastless track structure interlayer disease monitoring method - Google Patents
Ballastless track structure interlayer disease monitoring method Download PDFInfo
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- CN114112001A CN114112001A CN202111151723.8A CN202111151723A CN114112001A CN 114112001 A CN114112001 A CN 114112001A CN 202111151723 A CN202111151723 A CN 202111151723A CN 114112001 A CN114112001 A CN 114112001A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 49
- 201000010099 disease Diseases 0.000 title claims abstract description 28
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 title claims abstract description 28
- 239000011229 interlayer Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 83
- 239000010410 layer Substances 0.000 claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 29
- 230000001133 acceleration Effects 0.000 claims abstract description 17
- 239000011800 void material Substances 0.000 claims abstract description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 41
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000036541 health Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241001669679 Eleotris Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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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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- 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
- B61K9/10—Measuring installations for surveying permanent way for detecting cracks in rails or welds thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/08—Detecting presence of flaws or irregularities
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- Engineering & Computer Science (AREA)
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to a method for monitoring interlayer diseases of a ballastless track structure, which comprises the following steps: arranging the fiber bragg grating array vibration optical cable on the track slab in a full-line continuous mode to obtain vibration acceleration at each vibration measurement point on the track slab; establishing a vibration acceleration-time relation data set for each vibration measuring point, and comparing the vibration acceleration at the current time with the vibration acceleration at the historical time to judge whether a mortar layer of the track structure has a gap separating condition; and/or analyzing the vibration acceleration of each vibration measuring point on the same track plate to obtain the fundamental frequency mode of the track plate, establishing a fundamental frequency mode-time relation data set of the track plate, and judging whether the track structure has a mortar layer void condition or not according to the comparison between the fundamental frequency mode of the current time and the fundamental frequency mode of the historical time. The invention can obviously improve the real-time effectiveness, accuracy and reliability of the ballastless track interlayer disease monitoring, and is convenient for early warning in time and corresponding maintenance.
Description
Technical Field
The invention belongs to the technical field of rail traffic engineering, and particularly relates to a method for monitoring diseases between ballastless track structure layers.
Background
The slab ballastless track adopts a longitudinal connecting structure system, has the advantages of good smoothness, small deformation and the like, and is greatly influenced by temperature load, train load and the like. With the increase of the service time of the line, the interlayer bonding performance of the track structure is gradually degraded. Under the action of vertical temperature load of the track structure, the track plate can be vertically arched and deformed, and a gap between the track plate and the mortar layer is easy to appear due to long-time damage; under the action of longitudinal temperature load, along with gap between the track plate and the mortar layer, the wide and narrow seams between the track plates are stressed greatly, and diseases such as crushing of the wide and narrow seams of the track plate, deformation of the upper arch of the track plate and the like can occur under extreme conditions. Because high-speed rail lines are long and distributed in different climatic zones across the country, no effective method is found for monitoring the gap, the void, the damage and the like between the track structure layers by the railway engineering department at present, and the gap detection of the track slab mainly adopts a passive prevention mode.
Disclosure of Invention
The invention relates to a method for monitoring interlayer diseases of a ballastless track structure, which can at least solve part of defects in the prior art.
The invention relates to a method for monitoring interlayer diseases of a ballastless track structure, which comprises the following steps:
arranging a fiber grating array vibration optical cable integrated with a plurality of fiber grating vibration sensors on the track plate, wherein the fiber grating array vibration optical cable is continuously arranged along the full length of the track plate;
acquiring vibration acceleration at each vibration measuring point on the track slab through the fiber bragg grating array vibration optical cable;
establishing a vibration acceleration-time relation data set for each vibration measuring point, and comparing the vibration acceleration at the current time with the vibration acceleration at the historical time to judge whether a mortar layer of the track structure has a gap separating condition;
and/or analyzing the vibration acceleration of each vibration measuring point on the same track plate to obtain the fundamental frequency mode of the track plate, establishing a fundamental frequency mode-time relation data set of the track plate, and judging whether the track structure has a mortar layer void condition or not according to the comparison between the fundamental frequency mode of the current time and the fundamental frequency mode of the historical time.
As one embodiment, a vibration measuring point is arranged between every two adjacent fastener nodes.
In one embodiment, the distance between two vibration measuring points adjacent in the longitudinal direction is 0.5-0.8 m.
In one embodiment, the fiber grating array vibration optical cable is embedded in a track plate.
In one embodiment, a longitudinal monitoring groove is formed in the surface of the track slab to embed the fiber grating array vibration optical cable, and the longitudinal monitoring groove is filled with concrete.
As an embodiment, the method further comprises:
monitoring the vertical temperature gradient of the track structure; and establishing a vertical temperature gradient-time relation data set for each vertical temperature measuring point, comparing the vertical temperature gradient of the current time with the vertical temperature gradient of the historical time, judging whether a gap separating condition occurs between the track slab and the mortar layer, and analyzing the vertical upwarp deformation trend of the track slab.
In one embodiment, a vertical temperature measurement cable is arranged at each vertical temperature measurement point, the vertical temperature measurement cable is a fiber grating array optical cable integrated with a plurality of fiber grating temperature measurement sensors, and the temperature of the track plate, the temperature of the mortar layer and the temperature of the base plate at the current vertical temperature measurement point are obtained through the vertical temperature measurement cable, so that vertical temperature gradient data of the current vertical temperature measurement point are obtained through calculation.
The invention has at least the following beneficial effects:
according to the invention, the fiber bragg grating array vibration optical cable is covered and arranged along the whole length of the ballastless track, so that the full-line continuous vibration monitoring of the ballastless track can be realized, whether the mortar layer of the track structure has a gap state or not is judged according to the obtained vibration data, the real-time effectiveness, accuracy and reliability of the disease monitoring between the ballastless track layers can be obviously improved, the interlayer diseases of the ballastless track can be timely and effectively mastered, early warning is timely carried out, maintenance is correspondingly carried out, and the labor intensity and labor cost of railway engineering departments and the like are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of the arrangement of optical cables on a track plate according to an embodiment of the present invention;
FIG. 2 is a schematic layout view of a fiber grating array vibration cable according to an embodiment of the present invention;
FIG. 3 is a schematic layout view of a fiber grating array thermometric optical cable according to an embodiment of the present invention;
fig. 4 is a schematic layout diagram of a fiber grating temperature demodulator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a method for monitoring an interlayer disease of a ballastless track structure, where the method includes:
arranging a fiber grating array vibration optical cable 2 integrated with a plurality of fiber grating vibration sensors on the track plate 11, wherein the fiber grating array vibration optical cable 2 is continuously arranged along the whole length of the track plate;
acquiring vibration acceleration at each vibration measurement point on the track slab 11 through the fiber bragg grating array vibration optical cable 2;
establishing a vibration acceleration-time relation data set for each vibration measuring point, and comparing the vibration acceleration at the current time with the vibration acceleration at the historical time to judge whether the mortar layer 12 of the track structure has a gap separating condition;
and/or analyzing the vibration acceleration of each vibration measuring point on the same track plate 11 to obtain the fundamental frequency mode of the track plate 11, establishing a fundamental frequency mode-time relation data set of the track plate 11, and comparing the fundamental frequency mode of the current time with the fundamental frequency mode of the historical time to judge whether the track structure has a mortar layer 12 void condition.
Obviously, the fiber grating vibration demodulator 5 needs to be configured correspondingly, the fiber grating array vibration optical cable 2 is used for collecting vibration information of the track plate 11 and sending the vibration information to the fiber grating vibration demodulator 5, and the fiber grating vibration demodulator 5 is used for receiving the vibration information sent by the fiber grating array vibration optical cable 2, demodulating the vibration information into a demodulation signal and sending the demodulation signal to the background processor. The fiber grating array vibration optical cable 2 is a cable with a plurality of fiber grating vibration sensors integrated in a single optical cable, is an existing product, and has the characteristics of wide monitoring coverage range (capable of covering more than 10km according to needs), high measurement precision, small sensing unit interval (the minimum interval can be 1cm), and the like, and the specific structure is not repeated here. The fiber grating vibration demodulator 5 is also the existing equipment; it may be electrically connected or communicatively connected to the background processor, which is conventional. In view of the long overall length of the ballastless track, as shown in fig. 4, the fiber grating vibration demodulator 5 is preferably provided in plurality, so as to ensure the accuracy and reliability of the vibration data. Preferably, each fiber grating vibration demodulator 5 is configured to acquire monitoring information of two sections of vibration cables on front and rear sides of the fiber grating vibration demodulator; in one embodiment, the fiber grating array vibration optical cable 2 is continuously arranged along the whole line of the ballastless track, that is, two adjacent fiber grating vibration demodulators 5 are connected in series by a single cable, in the single series cable, a certain point is taken as a demarcation point, the fiber grating vibration sensor on the front side of the demarcation point sends monitoring information to the fiber grating vibration demodulator 5 on the front side, and the fiber grating vibration sensor on the rear side of the demarcation point sends monitoring information to the fiber grating vibration demodulator 5 on the rear side, which can be realized by setting the light emission direction of the fiber grating vibration sensor in the optical cable; in another embodiment, the fiber grating array vibration optical cable 2 adopts a split arrangement mode and comprises a plurality of vibration monitoring cable sections, the end parts of two adjacent vibration monitoring cable sections are abutted or the two adjacent vibration monitoring cable sections are partially overlapped, the effect of the overall-length covering arrangement of the ballastless track can be realized, the overall-line vibration monitoring of the ballastless track can be realized, in the scheme, two vibration monitoring cable sections can be arranged between two adjacent fiber grating vibration demodulators 5, and the two vibration monitoring cable sections are respectively connected with the two fiber grating vibration demodulators 5. Preferably, one fiber grating vibration demodulator 5 is arranged per station.
In the method, the background processor is used for acquiring a demodulation signal sent by the fiber grating vibration demodulator 5, analyzing, processing and storing the acquired information, establishing a vibration acceleration-time relation data set for each vibration measuring point, and judging whether a gap condition occurs in a mortar layer 12 of the track structure according to the vibration acceleration-time relation data set; and/or the background processor is used for acquiring a demodulation signal sent by the fiber grating vibration demodulator 5, analyzing the vibration acceleration of each vibration measuring point on the same track plate 11 to obtain the fundamental frequency mode of the track plate 11, establishing a fundamental frequency mode-time relation data set of the track plate 11, and judging whether the track structure has a mortar layer 12 void condition according to the fundamental frequency mode-time relation data set.
Further, the vibration amplitude, the frequency and the like of the measuring points of the same track plate 11 are comprehensively analyzed, the comprehensive analysis result of the vibration data of each time when the train passes through the time is compared with the average value, the standard deviation and other statistics and analysis of the historical vibration data of a plurality of previous trains at the time or all previous trains at a plurality of days at the time, and the disease conditions of rail fracture, fastener failure, sleeper empty suspension, track plate gap, vibration isolation element failure and the like of the track structure can be indirectly reflected; when the vibration data of a certain measuring point is abnormal, the possibility that the track structure has the diseases exists in the area is indicated, and the specific types of the diseases can be discriminated by synchronously calling video monitoring data or performing field inspection and the like.
The number and distribution of the vibration measuring points can be set according to specific conditions. In one embodiment, a vibration measuring point is arranged between every two adjacent fastener nodes. Optionally, the distance between two longitudinally adjacent vibration measuring points is 0.5-0.8 m, for example, the same as the distance between adjacent fastener nodes. It is easy to understand that only one fiber grating vibration sensor is correspondingly arranged at each vibration measuring point.
As shown in fig. 2, for the arrangement of the fiber grating array vibration optical cable 2, it is preferable that it is buried in the track plate 11, for example, a longitudinal wiring groove is opened on the surface of the track plate to bury the fiber grating array vibration optical cable 2, and the longitudinal wiring groove is filled with concrete. The concrete poured in the longitudinal wiring groove is preferably high-strength and quick-setting concrete. In another scheme, the fiber grating array vibration optical cable 2 can also be laid simultaneously when the track plate 11 is poured.
Example two
The embodiment further optimizes the method for monitoring the interlayer diseases of the ballastless track structure provided by the first embodiment.
The method further comprises the following steps:
monitoring the vertical temperature gradient of the track structure; and establishing a vertical temperature gradient-time relation data set for each vertical temperature measuring point 31, comparing the vertical temperature gradient of the current time with the vertical temperature gradient of the historical time, judging whether a gap separating condition occurs between the track plate 11 and the mortar layer 12, and analyzing the vertical upward arching deformation trend of the track plate 11.
On the basis of the ballastless track structure interlayer disease monitoring means based on the fiber bragg grating array vibration optical cable 2, the judgment accuracy of the interlayer disease of the track structure can be further improved by combining the monitoring means for the vertical temperature gradient of the track structure; and a track structure temperature gradient-interlayer disease relation data set can be established, the data set is perfected and corrected in the continuous monitoring process, and a reference and analysis basis is provided for the subsequent judgment operation of the background processor.
Specifically, when a gap occurs between the track slab 11 and the mortar layer 12, the presence of air in the gap may cause a change in the vertical temperature gradient of the track structure. Alternatively, when the vertical temperature gradient of the track structure changes abruptly or slowly, the vertical upward arching deformation tendency of the track slab 11 can be indirectly judged.
Preferably, a vertical temperature measurement cable is arranged at each vertical temperature measurement point 31, the vertical temperature measurement cable 311 is a fiber grating array optical cable integrated with a plurality of fiber grating temperature measurement sensors, and the track plate temperature, the mortar layer temperature and the base plate temperature at the current vertical temperature measurement point 31 are obtained through the vertical temperature measurement cable 311, so that the vertical temperature gradient data of the current vertical temperature measurement point 31 are obtained through calculation. As shown in fig. 3, the vertical temperature measuring cable 311 is buried in the ballastless track structure, and at least one fiber grating temperature measuring sensor is distributed in the track slab 11, the mortar layer 12 and the base slab 13. The vertical temperature gradient of the track structure at the corresponding measuring point is obtained through the vertical temperature measuring cable 311, and whether the vertical temperature load of the track structure is in a normal range is judged according to the vertical temperature gradient, so that a work department and the like can judge the health condition of the track structure and can further detect and maintain the ballastless track in time.
Preferably, a vertical temperature load can be applied to the finite element analysis model based on the finite element analysis model of the rail structure to calculate the theoretical stress condition of the rail structure.
Further preferably, as shown in fig. 1 and fig. 3, there are a plurality of vertical temperature measuring cables 311, and accordingly, a plurality of vertical temperature measuring points 31 are formed in the ballastless track structure, so that the health conditions of the track structure at different positions can be accurately monitored. In one embodiment, at least part of the vertical temperature measuring points 31 are arranged in a straight line along the longitudinal direction of the track, the vertical temperature measuring points 31 are arranged on the ballastless track at proper longitudinal intervals, the longitudinal temperature gradient of the track structure can be obtained according to temperature data fed back by each vertical temperature measuring point 31, whether the longitudinal temperature load of the track structure is in a normal range can be judged according to the longitudinal temperature gradient, and the accuracy of judging the interlayer diseases of the track structure can be further improved.
Further, as shown in fig. 1 and fig. 3, each vertical temperature measurement cable 311 is connected by a horizontal connection cable to form a continuous fiber grating array temperature measurement cable. When the number of the vertical temperature measuring points 31 is enough, the horizontal connecting cable is only used for signal transmission without arranging a fiber bragg grating temperature measuring sensor; obviously, preferably, the fiber bragg grating temperature measurement sensor is also arranged in the horizontal connection cable, so that the temperature data of the track structure is richer, the judgment on the conditions such as the longitudinal temperature load of the track structure is more accurate and reliable, particularly, the longitudinal temperature information of the track plate 11 is more comprehensive, the health monitoring of the track plate 11 is facilitated, the monitoring on the diseases (generally accompanied with the interlayer diseases of the track structure) such as the vertical upward arching deformation of the track plate 11 is included, and the occurrence of the conditions such as missing detection and erroneous judgment can be reduced.
Based on the above structure, as shown in fig. 3, the vertical temperature measuring cable 311 is a U-shaped cable with a top end located in the track plate 11 and a bottom end located in the base plate 13, and two end portions located in the track plate 11 are respectively connected with a horizontal connecting cable, so as to form a continuous fiber grating array temperature measuring cable in the track structure. Further preferably, as shown in fig. 3, each vertical line segment of the vertical temperature measurement cable 311 has at least one fiber bragg grating temperature measurement sensor in the track plate 11, the mortar layer 12 and the base plate 13, so that the vertical temperature monitoring of the track structure can be realized by each vertical line segment, and the temperature information obtained by two vertical line segments can be mutually proved, so as to improve the accuracy of the monitoring result, for example: at each vertical temperature measuring point 31, the monitoring data of each fiber bragg grating temperature sensor in the track slab 11 at the same moment can be obtained and averaged, the monitoring data in the mortar layer 12 and the monitoring data in the base plate 13 are processed in the same way, and the accuracy and the reliability of the monitoring result are obviously higher; if the difference of the monitoring data of different fiber bragg grating temperature sensors in the same structural plate is large, the vertical temperature measurement cable 311 can be marked, so that the industrial department can conveniently and timely detect whether the vertical temperature measurement cable 311 has faults or not, namely, the fault self-detection of the vertical temperature measurement cable 311 is realized, and the working reliability is high. In this embodiment, each vertical line segment has a fiber grating temperature sensor in the track plate 11, the mortar layer 12 and the base plate 13.
In one embodiment, there are a plurality of vertical temperature measurement points 31, and the distance between two adjacent vertical temperature measurement points 31 is within the range of 5-10 m, and it is further preferable that one vertical temperature measurement point 31 is arranged every 6-7 m.
In one embodiment, the longitudinal length of the vertical temperature measurement point 31 (i.e., the distance between the two vertical line segments) is in the range of 700-800 mm. In the vertical temperature measurement cable 311, the distance between the fiber grating temperature measurement sensor in the base plate 13 and the surface of the track plate is in the range of 220-350 mm, the distance between the fiber grating temperature measurement sensor in the mortar layer 12 and the surface of the track plate is in the range of 190-220 mm, and the distance between the fiber grating temperature measurement sensor in the track plate 11 and the surface of the track plate is in the range of 80-150 mm. In alternative embodiments: (1) in the CRTSII type plate ballastless track subgrade section, the vertical length for measuring temperature is 800mm, the distance between the fiber grating temperature measuring sensor in the track plate 11 and the surface of the track plate is 100mm, the distance between the fiber grating temperature measuring sensor in the mortar layer 12 and the surface of the track plate is 215mm, and the distance between the fiber grating temperature measuring sensor in the base plate 13 and the surface of the track plate is 300 mm; (2) in the CRTSII slab ballastless track bridge section, the longitudinal length of a vertical temperature measuring point 31 is 700mm, the distance between a fiber grating temperature measuring sensor in a track slab 11 and the surface of the track slab is 100mm, the distance between the fiber grating temperature measuring sensor in a mortar layer 12 and the surface of the track slab is 215mm, and the distance between the fiber grating temperature measuring sensor in a base plate 13 and the surface of the track slab is 250 mm; (3) in the CRTSII slab ballastless track tunnel section, the longitudinal length of the vertical temperature measuring point 31 is 700mm, the distance between the fiber grating temperature measuring sensor in the track slab 11 and the surface of the track slab is 100mm, the distance between the fiber grating temperature measuring sensor in the mortar layer 12 and the surface of the track slab is 215mm, and the distance between the fiber grating temperature measuring sensor in the base plate 13 and the surface of the track slab is 250 mm.
For the arrangement of the vertical temperature measuring cable 311, it is preferable that, as shown in fig. 3, a grouting hole 312 is formed in the track plate 11 corresponding to the position of each vertical temperature measuring cable 311 and the grouting hole 312 extends into the base plate 13, the vertical temperature measuring cable 311 is embedded in the corresponding grouting hole 312 and the grouting hole 312 is grouted and sealed. The concrete poured into the grouting hole 312 is preferably high-strength and quick-setting concrete, so that the position accuracy of the vertical temperature measuring cable 311 in the grouting hole 312 is ensured, and the vertical temperature measuring cable 311 can be well protected.
Generally, the base plate 13, the mortar layer 12 and the track slab 11 are of a layered structure, for example, each layer is sequentially poured, and the associativity, integrity and the like among the layers will affect the health condition of the track structure.
For the arrangement of the horizontal connection cable, it is preferable that a wiring groove 111 is opened on the track plate 11 to bury the horizontal connection cable, and the wiring groove 111 is filled with concrete. Similarly, the concrete poured in the raceway groove 111 is preferably high-strength, quick-setting concrete.
The wiring channels 111 are obviously communicated with the adjacent grouting holes 312, further, concrete is poured in the wiring channels 111 and the grouting holes 312 at the same time, at least concrete is poured in each grouting hole 312 and the two adjacent wiring channels 111 at the same time, a T-shaped concrete structure is formed in the track structure, the structural integrity and the cooperative stress performance of all layers of the track structure are improved, meanwhile, the multidirectional constraint effect on the track plate 11 can be well achieved, and the operation reliability of the track structure is further improved.
Generally, a fiber grating temperature demodulator can be configured near a station or a track, the vertical temperature measurement cable 311/the fiber grating array temperature measurement optical cable is connected with the nearby fiber grating temperature demodulator, and the fiber grating temperature demodulator receives temperature information sent by the vertical temperature measurement cable 311/the fiber grating array temperature measurement optical cable, demodulates the temperature information into a demodulation signal and sends the demodulation signal to the background processor. The fiber grating temperature demodulator is the existing equipment; it may be electrically connected or communicatively connected to the background processor, which is conventional.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A ballastless track structure interlayer disease monitoring method is characterized by comprising the following steps:
arranging a fiber grating array vibration optical cable integrated with a plurality of fiber grating vibration sensors on the track plate, wherein the fiber grating array vibration optical cable is continuously arranged along the full length of the track plate;
acquiring vibration acceleration at each vibration measuring point on the track slab through the fiber bragg grating array vibration optical cable;
establishing a vibration acceleration-time relation data set for each vibration measuring point, and comparing the vibration acceleration at the current time with the vibration acceleration at the historical time to judge whether a mortar layer of the track structure has a gap separating condition;
and/or analyzing the vibration acceleration of each vibration measuring point on the same track plate to obtain the fundamental frequency mode of the track plate, establishing a fundamental frequency mode-time relation data set of the track plate, and judging whether the track structure has a mortar layer void condition or not according to the comparison between the fundamental frequency mode of the current time and the fundamental frequency mode of the historical time.
2. The ballastless track structure interlayer disease monitoring method of claim 1, which is characterized in that: and a vibration measuring point is arranged between every two adjacent fastener nodes.
3. The ballastless track structure interlayer disease monitoring method of claim 2, which is characterized in that: the distance between two longitudinally adjacent vibration measuring points is 0.5-0.8 m.
4. The ballastless track structure interlayer disease monitoring method of claim 1, which is characterized in that: the fiber bragg grating array vibration optical cable is embedded in the track plate.
5. The ballastless track structure interlayer disease monitoring method of claim 4, which is characterized in that: and arranging a longitudinal monitoring groove on the surface of the track slab to embed the fiber bragg grating array vibration optical cable, wherein the longitudinal monitoring groove is filled with concrete.
6. The ballastless track structure interlayer disease monitoring method of any one of claims 1-5, wherein the method further comprises:
monitoring the vertical temperature gradient of the track structure; and establishing a vertical temperature gradient-time relation data set for each vertical temperature measuring point, comparing the vertical temperature gradient of the current time with the vertical temperature gradient of the historical time, judging whether a gap separating condition occurs between the track slab and the mortar layer, and analyzing the vertical upwarp deformation trend of the track slab.
7. The ballastless track structure interlayer disease monitoring method of claim 6, which is characterized in that: and arranging a vertical temperature measurement cable at each vertical temperature measurement point, wherein the vertical temperature measurement cable is a fiber grating array optical cable integrated with a plurality of fiber grating temperature measurement sensors, and acquiring the temperature of the track plate, the temperature of the mortar layer and the temperature of the base plate at the current vertical temperature measurement point through the vertical temperature measurement cable, so as to calculate and obtain vertical temperature gradient data of the current vertical temperature measurement point.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114604289A (en) * | 2022-03-16 | 2022-06-10 | 武汉理工大学 | Ballastless track slab state monitoring system and method based on fiber bragg grating array sensing |
| CN114659611A (en) * | 2022-03-16 | 2022-06-24 | 武汉理工大学 | Track fastener state monitoring system based on fiber grating array |
| CN114993453A (en) * | 2022-08-05 | 2022-09-02 | 武汉理工大学 | Bridge vibration mode monitoring system and method based on fiber bragg grating array sensing |
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