CN114112001B - Interlayer defect monitoring method for ballastless track structure - Google Patents
Interlayer defect monitoring method for ballastless track structure Download PDFInfo
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- CN114112001B CN114112001B CN202111151723.8A CN202111151723A CN114112001B CN 114112001 B CN114112001 B CN 114112001B CN 202111151723 A CN202111151723 A CN 202111151723A CN 114112001 B CN114112001 B CN 114112001B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 239000011229 interlayer Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000007547 defect Effects 0.000 title claims description 10
- 239000000835 fiber Substances 0.000 claims abstract description 81
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 239000010410 layer Substances 0.000 claims abstract description 35
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 30
- 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 44
- 201000010099 disease Diseases 0.000 abstract description 16
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 16
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000036541 health Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000001360 synchronised effect 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
- 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
- 238000007789 sealing Methods 0.000 description 1
- 230000008054 signal transmission Effects 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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- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Mechanical Engineering (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to a ballastless track structure interlayer disease monitoring method, which comprises the following steps: continuously arranging fiber bragg grating array vibration optical cables on the track plate in a full line manner to obtain vibration acceleration at each vibration measuring point on the track plate; establishing a vibration acceleration-time relation data set for each vibration measuring point, and judging whether a gap condition occurs on a mortar layer of the track structure according to comparison between the vibration acceleration of the current time and the vibration acceleration of the historical time; 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 or not according to the comparison of the fundamental frequency mode of the current time and the fundamental frequency mode of the historical time. The invention can remarkably 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 track traffic engineering, and particularly relates to a ballastless track structure interlayer disease monitoring method.
Background
The slab ballastless track adopts a longitudinal connection 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. As the line service time increases, the interlayer adhesion performance of the track structure gradually deteriorates. Under the action of vertical temperature load, the rail plate can vertically arch upwards to deform, and long-time diseases easily cause gaps between the rail plate and the mortar layer; under the action of longitudinal temperature load, the wide and narrow joints between the track plates are stressed greatly along with the gap between the track plates and the mortar layer, and in extreme cases, the defects such as crushing of the wide and narrow joints of the track plates, arch deformation of the track plates and the like can occur. Because the high-speed railway lines are long and distributed in different climate zones nationwide, the current railway service departments do not find an effective method for monitoring the inter-layer gaps, the void, the breakage and the like of the track structure layers, and mainly adopt a passive prevention mode for detecting the gaps of the track plates.
Disclosure of Invention
The invention relates to a ballastless track structure interlayer defect monitoring method which at least can 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 fiber grating array vibration optical cables integrated with a plurality of fiber grating vibration sensors on the track plate, wherein the fiber grating array vibration optical cables are continuously arranged along the whole length of the track plate;
obtaining vibration acceleration at each vibration measuring point on the track board through the fiber bragg grating array vibration optical cable;
establishing a vibration acceleration-time relation data set for each vibration measuring point, and judging whether a gap condition occurs on a mortar layer of the track structure according to comparison between the vibration acceleration of the current time and the vibration acceleration of the historical time;
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 or not according to the comparison of the fundamental frequency mode of the current time and the fundamental frequency mode of the historical time.
As one implementation mode, a vibration measuring point is arranged between every two adjacent fastener nodes.
As one embodiment, the distance between two vibration measuring points adjacent in the longitudinal direction is 0.5-0.8 m.
As one embodiment, the fiber bragg grating array vibration optical cable is buried in the track plate.
As one implementation mode, longitudinal monitoring grooves are formed in the surface of the track plate so as to embed the fiber grating array vibration optical cable, and the longitudinal monitoring grooves are sealed and filled with concrete.
As one embodiment, the method further comprises:
monitoring the vertical temperature gradient of the track structure; and (3) 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 condition occurs between the track plate and the mortar layer, and analyzing the vertical arch deformation trend of the track plate.
As one of implementation modes, a vertical temperature measuring cable is arranged at each vertical temperature measuring point, the vertical temperature measuring cable is an optical fiber grating array optical cable integrated with a plurality of optical fiber grating temperature measuring sensors, and the temperature of a track plate, the temperature of a mortar layer and the temperature of a base plate at the current vertical temperature measuring point are obtained through the vertical temperature measuring cable, so that the vertical temperature gradient data of the current vertical temperature measuring point are calculated.
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 full-line continuous vibration monitoring of the ballastless track can be realized, whether a gap condition occurs in a mortar layer of the track structure or whether a gap condition occurs in the mortar layer of the track structure is judged according to the obtained vibration data, the real-time effectiveness, accuracy and reliability of monitoring the inter-layer diseases of the ballastless track can be remarkably improved, the inter-layer diseases of the ballastless track can be conveniently and timely mastered, early warning and corresponding maintenance can be timely carried out, and the labor intensity and labor cost of railway service 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 diagram of an arrangement of fiber optic cables on a track slab provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of an arrangement of a fiber grating array vibration optical cable according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an arrangement of a fiber grating array temperature measurement optical cable according to an embodiment of the present invention;
fig. 4 is a schematic layout diagram of a fiber bragg grating temperature demodulator 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 method for monitoring interlayer damage of a ballastless track structure, the method including:
a fiber grating array vibration optical cable 2 integrated with a plurality of fiber grating vibration sensors is arranged on a track plate 11, and the fiber grating array vibration optical cable 2 is continuously arranged along the whole length of the track plate;
obtaining vibration acceleration at each vibration measuring point on the track plate 11 through the fiber bragg grating array vibration optical cable 2;
for each vibration measuring point, a vibration acceleration-time relation data set is established, and whether the mortar layer 12 of the track structure is in a gap state or not is judged according to the comparison between the vibration acceleration of the current time and the vibration acceleration of the historical time;
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 judging whether the mortar layer 12 is in a void state of the track structure according to the comparison between the fundamental frequency mode of the current time and the fundamental frequency mode of the historical time.
Obviously, the fiber grating vibration demodulator 5 is required 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 and demodulating the vibration information into demodulation signals to be sent 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 (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. The fiber bragg grating vibration demodulator 5 is also the existing equipment; the connection between the background processor and the background processor can be electric connection or communication connection, which is a conventional technology. As shown in fig. 4, in view of the longer overall length of the ballastless track, the fiber grating vibration demodulators 5 are preferably provided in plurality to ensure the accuracy and reliability of vibration data. Preferably, each fiber grating vibration demodulator 5 is used for acquiring monitoring information of two sections of vibration cables on the front side and the rear side 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, a certain point is taken as a demarcation point in the single serial cable, the fiber grating vibration sensor at the front side of the demarcation point sends monitoring information to the fiber grating vibration demodulators 5 at the front side, and the fiber grating vibration sensor at the rear side of the demarcation point sends monitoring information to the fiber grating vibration demodulators 5 at the rear side, which can be realized by setting the light emission direction of the fiber grating vibration sensors in the optical cable; in another embodiment, the fiber bragg grating array vibration optical cable 2 adopts a split arrangement mode, and comprises a plurality of vibration monitoring cable segments, wherein the end parts of two adjacent vibration monitoring cable segments are propped against or the two adjacent vibration monitoring cable segments are partially overlapped, the effect of the full-length coverage arrangement of the ballastless track can be achieved, and the full-line vibration monitoring of the ballastless track can be achieved. Preferably, one fiber grating vibration demodulator 5 is arranged per station.
In the method, the background processor is used for acquiring the 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 the mortar layer 12 of the track structure has a gap condition according to the vibration acceleration-time relation data set; and/or the background processor is used for acquiring demodulation signals sent by the fiber grating vibration demodulator 5, analyzing vibration acceleration of each vibration measuring point on the same track plate 11, acquiring a 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 mortar layer 12 void condition of the track structure occurs according to the fundamental frequency mode-time relation data set.
Further, the vibration amplitude, frequency and the like of the measuring points of the same track slab 11 are comprehensively analyzed, and the comprehensive analysis result of the vibration data at each passing time of the train is compared with the historical vibration data of the plurality of trains passing the time or all trains passing the plurality of days passing the time in a mean value, standard deviation and the like for statistical comparison analysis, so that the defect conditions of rail fracture, fastener failure, sleeper empty hanging, track slab gap, vibration isolation element failure and the like of the track structure can be indirectly reflected; when vibration data of a certain measuring point is abnormal, the possibility of occurrence of diseases of the track structure exists in the area, and the specific type of the diseases can be screened by synchronously calling video monitoring data or on-site 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. Alternatively, the spacing between two vibration measurement points longitudinally adjacent is 0.5-0.8 m, for example the same as the spacing between adjacent fastener nodes. It is easy to understand that each vibration measuring point is correspondingly provided with a fiber bragg grating vibration sensor.
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 board 11, for example, a longitudinal wiring groove is opened on the surface of the track board to embed 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 quick-setting concrete. In another embodiment, the fiber bragg grating array vibration optical cable 2 may be simultaneously laid out when the track slab 11 is cast.
Example two
The method for monitoring the interlayer defect of the ballastless track structure provided by the first embodiment is further optimized.
The method further comprises the steps of:
monitoring the vertical temperature gradient of the track structure; for each vertical temperature measuring point 31, a vertical temperature gradient-time relation data set is established, whether a gap condition occurs between the track plate 11 and the mortar layer 12 is judged according to the comparison of the vertical temperature gradient of the current time and the vertical temperature gradient of the historical time, and the vertical arch deformation trend of the track plate 11 is analyzed.
On the basis of the monitoring means for the interlayer diseases of the ballastless track structure based on the fiber bragg grating array vibration optical cable 2, the accuracy of judging the interlayer diseases 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, and the data set is perfected and corrected in the continuous monitoring process, so that a reference and analysis basis is provided for the subsequent judgment operation of a background processor.
In particular, when a gap occurs between the rail plate 11 and the mortar layer 12, the presence of air in the gap may cause a change in the vertical temperature gradient of the rail structure. Alternatively, when abrupt or creep occurs in the vertical temperature gradient of the rail structure, the vertical arch deformation tendency of the rail plate 11 may 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 rail 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 calculated. As shown in fig. 3, the vertical temperature measurement cable 311 is embedded in the ballastless track structure and at least one fiber grating temperature measurement sensor is distributed in the track slab 11, the mortar layer 12 and the base slab 13 respectively. 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 or not is judged according to the vertical temperature gradient, so that a service department and the like can judge the health condition of the track structure and can further detect and maintain the ballastless track timely.
Preferably, the vertical temperature load may be applied to the finite element analysis model based on the finite element analysis model of the rail structure to calculate the theoretical rail structure stress condition.
Further preferably, as shown in fig. 1 and 3, a plurality of vertical temperature measuring cables 311 are provided, and a plurality of vertical temperature measuring points 31 are correspondingly formed in the ballastless track structure, so that the health condition 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, by arranging the vertical temperature measuring points 31 on the ballastless track at proper longitudinal intervals, according to the temperature data fed back by each vertical temperature measuring point 31, the longitudinal temperature gradient of the track structure can be obtained, and according to the longitudinal temperature gradient, whether the longitudinal temperature load of the track structure is in the normal range can be judged, so that the judgment accuracy of the interlayer diseases of the track structure can be further improved.
Further, as shown in fig. 1 and 3, each vertical temperature measurement cable 311 is connected by a horizontal connection cable to form a continuous fiber grating array temperature measurement optical cable. When the number of the vertical temperature measuring points 31 is enough, the fiber bragg grating temperature measuring sensor is not arranged in the horizontal connecting cable, but only used for signal transmission; obviously, the optical fiber grating temperature sensor is preferably arranged in the horizontal connecting cable, so that the temperature data of the track structure is more abundant, the judgment on the conditions of longitudinal temperature load and the like of the track structure is more accurate and reliable, especially, 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 diseases such as vertical arch deformation of the track plate 11 (generally accompanied by interlayer diseases of the track structure) is included, and the occurrence of the conditions such as omission detection, misjudgment and the like can be reduced.
Based on the above structure, as shown in fig. 3, the vertical temperature measurement cable 311 is a U-shaped cable with its top end located in the track slab 11 and its bottom end located in the base slab 13, and two ends of the U-shaped cable located in the track slab 11 are respectively connected with a horizontal connection cable, so as to form a continuous fiber bragg grating array temperature measurement optical cable in the track structure. Further preferably, as shown in fig. 3, each vertical line segment of the vertical temperature measurement cable 311 is provided with at least one fiber bragg grating temperature measurement sensor in the track board 11, the mortar layer 12 and the base board 13 respectively, so that each vertical line segment can realize vertical temperature monitoring of the track structure, and temperature information obtained by the two vertical line segments are mutually proved, so that accuracy of monitoring results can be improved, for example: at each vertical temperature measuring point 31, the monitoring data of each fiber grating temperature sensor in the track plate 11 at the same time can be obtained and averaged, the monitoring data in the mortar layer 12 and 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 the different fiber bragg grating temperature sensors in the same structural board is large, the vertical temperature measurement cable 311 can be marked, so that a service department can conveniently and timely detect whether the vertical temperature measurement cable 311 has faults, 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 a distance between two adjacent vertical temperature measurement points 31 is in a range of 5-10 m, and more preferably, 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 bragg grating temperature measurement sensor in the base plate 13 and the surface of the track plate is 220-350 mm, the distance between the fiber bragg grating temperature measurement sensor in the mortar layer 12 and the surface of the track plate is 190-220 mm, and the distance between the fiber bragg grating temperature measurement sensor in the track plate 11 and the surface of the track plate is 80-150 mm, which is not limited to the layout position, and can be designed and adjusted according to the specific track structure. In alternative embodiments: (1) The CRTSII type plate ballastless track subgrade section has a vertical temperature measuring longitudinal length of 800mm, a distance between a fiber grating temperature measuring sensor in a track plate 11 and the surface of the track plate is 100mm, a distance between a fiber grating temperature measuring sensor in a mortar layer 12 and the surface of the track plate is 215mm, and a distance between a fiber grating temperature measuring sensor in a base plate 13 and the surface of the track plate is 300mm; (2) The longitudinal length of the CRTSII type plate ballastless track bridge section is 700mm, the distance between the fiber bragg grating temperature measuring sensor in the track plate 11 and the surface of the track plate is 100mm, the distance between the fiber bragg grating temperature measuring sensor in the mortar layer 12 and the surface of the track plate is 215mm, and the distance between the fiber bragg grating temperature measuring sensor in the base plate 13 and the surface of the track plate is 250mm; (3) The longitudinal length of the CRTSII type plate ballastless track tunnel section is 700mm, 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 250mm.
For the above arrangement of the vertical temperature measurement cables 311, preferably, as shown in fig. 3, a grouting hole 312 is formed on the track slab 11 corresponding to the position of each vertical temperature measurement cable 311, and the grouting hole 312 extends into the base slab 13, and the vertical temperature measurement cables 311 are buried in the corresponding grouting holes 312 and the grouting holes 312 are filled with grouting sealing. The concrete poured in the grouting holes 312 is preferably high-strength and quick-setting concrete, so that the position accuracy of the vertical temperature measurement cable 311 in the grouting holes 312 is ensured, and the vertical temperature measurement cable 311 can be well protected.
Generally, the base plate 13, the mortar layer 12 and the track plate 11 are layered structures, for example, each layer is poured in sequence, the combination property, the integration property and the like between each layer will affect the health condition of the track structure, in this embodiment, by arranging a plurality of grouting holes 312 in the track structure, the structural integration and the cooperative stress performance between each layer of the track structure can be effectively improved by the integrated concrete column formed in the grouting holes 312 outside meeting the layout requirement of the vertical temperature measurement cable 311, so that the occurrence rate of interlayer diseases of the track structure can be correspondingly reduced, and the health state and the service life of the track structure are improved.
For the arrangement of the horizontal connection cables described above, it is preferable that the track slab 11 is provided with the wiring groove 111 to embed the horizontal connection cables, and the wiring groove 111 is filled with concrete. Likewise, the concrete poured in the wiring groove 111 is preferably high-strength, quick setting concrete.
The above-mentioned wiring groove 111 obviously communicates with adjacent grouting holes 312, and further, the synchronous concrete pouring in wiring groove 111 and grouting holes 312, at least each grouting hole 312 and the synchronous concrete pouring in its adjacent two wiring grooves 111, then form T type concrete structure in the track structure, it can also play multidirectional constraint's effect to track board 11 well when improving the structural integrity and the cooperation atress performance between each layer of track structure, further improve the operational reliability of track structure.
In general, a fiber bragg grating temperature demodulator may be disposed near a station or a track, and the vertical temperature measurement cable 311/fiber bragg grating array temperature measurement optical cable is connected to a nearby fiber bragg grating temperature demodulator, and the fiber bragg grating temperature demodulator receives temperature information sent by the vertical temperature measurement cable 311/fiber bragg grating array temperature measurement optical cable, demodulates the temperature information into a demodulated signal, and sends the demodulated signal to a background processor. The fiber bragg grating temperature demodulator is existing equipment; the connection between the background processor and the background processor can be electric connection or communication connection, which is a conventional technology.
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 (4)
1. The method for monitoring the interlayer damage of the ballastless track structure is characterized by comprising the following steps:
arranging a fiber grating array vibration optical cable on a track plate, wherein the fiber grating array vibration optical cable is a cable with a plurality of fiber grating vibration sensors integrated in a single optical cable, and the fiber grating array vibration optical cable is continuously arranged along the whole length of the track plate;
obtaining vibration acceleration at each vibration measuring point on the track board through the fiber bragg grating array vibration optical cable;
establishing a vibration acceleration-time relation data set for each vibration measuring point, and judging whether a gap condition occurs on a mortar layer of the track structure according to comparison between the vibration acceleration of the current time and the vibration acceleration of the historical time;
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 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 fiber bragg grating array vibration optical cable is buried in the track plate; a longitudinal monitoring groove is formed in the surface of the track slab so as to embed the fiber grating array vibration optical cable, and the longitudinal monitoring groove is filled with concrete; or the fiber bragg grating array vibration optical cables are arranged at the same time when the track slab is poured;
the method further comprises the steps of:
monitoring the vertical temperature gradient of the track structure; and (3) establishing a vertical temperature gradient-time relation data set for each vertical temperature measuring point, and judging whether a gap condition exists between the track plate and the mortar layer according to the comparison between the vertical temperature gradient of the current time and the vertical temperature gradient of the historical time.
2. The ballastless track structure interlayer defect monitoring method of claim 1, wherein: a vibration measuring point is arranged between every two adjacent fastener nodes.
3. The ballastless track structure interlayer defect monitoring method of claim 2, wherein: the distance between two vibration measuring points which are longitudinally adjacent is 0.5-0.8 m.
4. The ballastless track structure interlayer defect monitoring method of claim 1, wherein: 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 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 the vertical temperature gradient data of the current vertical temperature measurement point are calculated.
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| CN114659611B (en) * | 2022-03-16 | 2024-05-14 | 武汉理工大学 | Track fastener state monitoring system based on fiber bragg grating array |
| 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 |
| CN114993453B (en) * | 2022-08-05 | 2022-11-11 | 武汉理工大学 | Bridge vibration mode monitoring system and method based on fiber grating array sensing |
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