CN114111611A - Ballastless track and track slab buckling deformation monitoring system and method - Google Patents
Ballastless track and track slab buckling deformation monitoring system and method Download PDFInfo
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- CN114111611A CN114111611A CN202111154104.4A CN202111154104A CN114111611A CN 114111611 A CN114111611 A CN 114111611A CN 202111154104 A CN202111154104 A CN 202111154104A CN 114111611 A CN114111611 A CN 114111611A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 129
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- 238000009529 body temperature measurement Methods 0.000 description 23
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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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
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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 track slab buckling deformation monitoring system which comprises a data demodulator and at least one group of monitoring units arranged on a track slab, wherein each monitoring unit comprises two fiber grating array stress optical cables integrated with a plurality of fiber grating stress sensors, the two stress optical cables in the same group are arranged at each buckling deformation monitoring point in a high-low mode, and the two stress optical cables are arranged between two buckling deformation monitoring points which are longitudinally adjacent in an X-shaped crossed mode. In addition, the ballastless track provided with the track slab buckling deformation monitoring system and the track slab buckling deformation monitoring method are also provided. The invention can rapidly and intuitively respond to the situation of the buckling deformation, and rapidly and accurately monitor the vertical buckling deformation of the track slab; the optical cable arrangement mode can eliminate the longitudinal displacement change of the track slab caused by the external load action such as temperature and the like, and improves the accuracy and reliability of monitoring the vertical warping deformation of the track slab.
Description
Technical Field
The invention belongs to the technical field of rail traffic engineering, and particularly relates to a track slab warp deformation monitoring system, a ballastless track provided with the track slab warp deformation monitoring system, and a track slab warp deformation monitoring method based on the track slab warp deformation monitoring system.
Background
The slab ballastless track adopts a longitudinal connecting structure system, has the advantages of good smoothness, small deformation and the like, but is greatly influenced by temperature load. Along with the increase of the service time of the line, the interlayer bonding performance of the track structure is gradually degraded, the track plate can be vertically arched and deformed under the action of vertical temperature load of the track structure, and the 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. Due to the fact that high-speed rail lines are long and distributed in different climatic zones across the country, no effective method is found for monitoring the buckling deformation of the track structure corresponding to the railway engineering department at present, and a passive prevention mode is mainly adopted for the buckling deformation of the track slab.
Disclosure of Invention
The invention relates to a track slab buckling deformation monitoring system, a ballastless track provided with the track slab buckling deformation monitoring system and a track slab buckling deformation monitoring method based on the track slab buckling deformation monitoring system, which can at least solve part of defects in the prior art.
The invention relates to a track slab warp deformation monitoring system, which comprises:
the monitoring unit comprises two fiber grating array stress optical cables integrated with a plurality of fiber grating stress sensors, the two stress optical cables in the same group are arranged in a high-low mode at each buckling deformation monitoring point, and the two stress optical cables are arranged in an X-shaped crossed mode between two buckling deformation monitoring points which are longitudinally adjacent;
and the data demodulator is used for receiving the stress information sent by the stress optical cable, demodulating the stress information into a demodulation signal and sending the demodulation signal to the background processor.
In one embodiment, each of the stress cables is continuously arranged along the entire length of the track plate.
In one embodiment, each stress cable is disposed on a surface of the track plate.
In one embodiment, the stress cable has a tip that does not extend above the rail face height of the rail.
As an embodiment, the monitoring unit further comprises a protective cover which is arranged on the surface of the track plate and covers the corresponding two stress optical cables.
In one embodiment, the distance between two adjacent warp deformation monitoring points is 5-7 m.
The invention also relates to a track slab buckling deformation monitoring method which is carried out based on the track slab buckling deformation monitoring system;
when the buckling deformation monitoring point is buckled and deformed, the two stress optical cables in the same group generate a differential effect, and a monitoring deformation is obtained based on the differential effect;
and eliminating error deformation on the basis of the monitored deformation to judge the vertical buckling deformation condition of the track plate, wherein the error deformation comprises error deformation of the track plate caused by temperature influence and error deformation caused by deformation in other directions.
The invention also relates to a ballastless track, and the track slab warpage monitoring system is configured on the track slab.
The invention has at least the following beneficial effects:
according to the invention, by adopting the crossed arrangement of the two fiber bragg grating array stress optical cables, when the warp deformation monitoring point generates vertical warp deformation, the two stress optical cables generate a differential effect, so that the warp deformation condition can be rapidly and visually responded, and the vertical warp deformation of the track slab can be rapidly and accurately monitored; the optical cable arrangement mode can eliminate the longitudinal displacement change of the track slab caused by the external load action such as temperature and the like, and improves the accuracy and reliability of monitoring the vertical warping deformation of the track slab.
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 diagram of an arrangement of an optical cable on a slab ballastless track according to an embodiment of the present invention;
FIG. 2 is a schematic layout view of a fiber grating array stress 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 view of a fiber grating array vibration cable according to an embodiment of the present invention;
fig. 5 is a schematic layout diagram of a fiber grating stress 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
Referring to fig. 1 and 2, an embodiment of the present invention provides a rail plate warp deformation monitoring system, including:
the monitoring units comprise two fiber grating array stress optical cables 21 integrated with a plurality of fiber grating stress sensors, the two stress optical cables 21 in the same group are arranged in a high-low mode at each buckling deformation monitoring point, and the two stress optical cables 21 are arranged in an X-shaped crossed mode between two buckling deformation monitoring points which are longitudinally adjacent;
and the data demodulator 5 is a fiber bragg grating stress demodulator 5, and is used for receiving the stress information sent by the stress optical cable 21, demodulating the stress information into a demodulation signal and sending the demodulation signal to the background processor.
The fiber grating array stress optical cable 21 is a cable with a plurality of fiber grating stress sensors integrated in a single optical cable, is an existing product, and has the characteristics of wide monitoring coverage range (covering more than 10km as required), high measurement precision, small sensing unit interval (the minimum interval can be 1cm), and the like, and the specific structure is not described here any more. The fiber bragg grating stress demodulator 5 is also an existing device; it may be electrically connected or communicatively connected to the background processor, which is conventional. Considering that the whole line length of the ballastless track is long, the fiber bragg grating stress demodulator 5 is preferably provided in plurality, so as to ensure the accuracy and reliability of stress data.
Preferably, each stress optical cable 21 is continuously arranged along the whole length of the track slab 11, so that the whole-line monitoring of the buckling deformation of the ballastless track slab is realized, and the monitoring result is more accurate and reliable. The number of the monitoring units can be set according to actual conditions, a group of monitoring units can be adopted to better complete reliable monitoring of the warp deformation of the track plate, and two or more groups of monitoring units can be adopted to further improve the accuracy of monitoring results. In one embodiment, the monitoring unit is arranged outside the rail, as shown in fig. 1.
As shown in fig. 2, it can be understood that there are two fiber grating stress sensors at each buckling deformation monitoring point, the two fiber grating stress sensors belong to two fiber grating array stress optical cables 21, and one of the fiber grating stress sensors is located above the other fiber grating stress sensor, that is, the requirement of "two stress optical cables 21 in the same group are arranged in height at each buckling deformation monitoring point" is met.
One of the fiber grating array stress optical cables 21 is defined as a first stress optical cable 211, and the other fiber grating array stress optical cable 21 is defined as a second stress optical cable 212. As shown in fig. 2, each stress optical cable 21 has a fiber bragg grating stress sensor at two longitudinally adjacent buckling deformation monitoring points, wherein one fiber bragg grating stress sensor is located at a high point at one of the buckling deformation monitoring points, and the other fiber bragg grating stress sensor is located at a low point at the other buckling deformation monitoring point, so that the stress optical cable 21 is obliquely arranged between the two longitudinally adjacent buckling deformation monitoring points; thus, in two adjacent buckling deformation monitoring points in the longitudinal direction, at the first buckling deformation monitoring point, the stress sensor of the first stress optical cable 211 is located right above the stress sensor of the second stress optical cable 212, at the second buckling deformation monitoring point, the stress sensor of the second stress optical cable 212 is located right above the stress sensor of the first stress optical cable 211, and the first stress optical cable 211 and the second stress optical cable 212 are arranged in an X-shaped cross between the two adjacent buckling deformation monitoring points in the longitudinal direction.
In the embodiment, the two fiber bragg grating array stress optical cables 21 are arranged in a crossed manner, when the warp deformation monitoring point generates vertical warp deformation, the two stress optical cables 21 generate a differential effect, the warp deformation condition can be responded rapidly and intuitively, and the vertical warp deformation of the track slab can be monitored rapidly and accurately. The optical cable arrangement mode can eliminate the longitudinal displacement change of the track slab caused by the external load action such as temperature and the like, and improves the accuracy and reliability of monitoring the vertical warping deformation of the track slab.
In one embodiment, as shown in fig. 2, each stress optical cable 21 is disposed on the surface of the track slab, so that the buckling deformation of the track slab 11 can be quickly and accurately reflected, and the stress optical cables 21 are convenient to arrange, replace and maintain. Further preferably, the monitoring unit further comprises a protective cover 22, the protective cover 22 is covered on the surface of the track slab and covers the two corresponding stress optical cables 21, so that the stress optical cables 21 can be well protected; in one embodiment, the stress cables 21 are fixed in a protective cover 22, and the protective cover 22 is fixed on the surface of the track plate (fixed by a fixing member such as an expansion screw). Further preferably, the top end of the stress optical cable 21 does not exceed the height of the rail surface of the steel rail, so as to avoid interference with train operation.
The number and distribution of the buckling deformation monitoring points can be set according to specific conditions. In one embodiment, the track slab 11 includes a plurality of segment slabs sequentially arranged along the longitudinal direction of the track, a buckling deformation monitoring point may be respectively arranged at the front end and the rear end of each segment slab, or the distance between two adjacent buckling deformation monitoring points is the length of one segment slab; optionally, the distance between two adjacent buckling deformation monitoring points is 5-7 m.
Based on the track plate warp deformation monitoring module, the following track plate warp deformation monitoring method is specifically adopted:
when the buckling deformation monitoring point is buckled and deformed, the two stress optical cables 21 in the same group generate a differential effect, and a monitoring deformation is obtained based on the differential effect;
and eliminating error deformation on the basis of the monitored deformation to judge the vertical buckling deformation condition of the track slab 11, wherein the error deformation comprises error deformation of the track slab 11 caused by temperature influence and error deformation caused by deformation in other directions.
Example two
The embodiment of the invention provides a ballastless track, and the track slab buckling deformation monitoring system provided by the first embodiment is configured on a track slab 11.
EXAMPLE III
In this embodiment, the ballastless track provided by the second embodiment and the track slab warp deformation monitoring method in the first embodiment are further optimized.
As shown in fig. 1 and fig. 3, an embodiment of the present invention provides a ballastless track full-line temperature field monitoring system, which includes a fiber grating array temperature measurement optical cable 3 integrated with a plurality of fiber grating temperature measurement sensors, and a fiber grating temperature demodulator connected to the fiber grating array temperature measurement optical cable 3, wherein the fiber grating array temperature measurement optical cable 3 is arranged in a manner of covering along the full length of a ballastless track, and is configured to at least collect temperature information of a track slab 11 and send the temperature information to the fiber grating temperature demodulator; the fiber grating temperature demodulator is used for receiving the temperature information sent by the fiber grating array temperature measuring optical cable 3, demodulating the temperature information into a demodulation signal and sending the demodulation signal to the background processor.
The fiber grating array temperature measurement optical cable 3 is a cable with a plurality of fiber grating temperature measurement 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 temperature demodulator is also the existing equipment; it may be electrically connected or communicatively connected to the background processor, which is conventional. Considering that the whole line length of the ballastless track is long, the fiber bragg grating temperature demodulators are preferably arranged in multiple numbers so as to ensure the accuracy and reliability of temperature measurement data. Preferably, each fiber grating temperature demodulator is used for acquiring monitoring information of two sections of temperature measuring cables on the front side and the rear side of the fiber grating temperature demodulator; in one embodiment, the fiber grating array temperature measuring optical cable 3 is continuously arranged along the whole line of the ballastless track, that is, two adjacent fiber grating temperature demodulators 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 temperature measuring sensor on the front side of the demarcation point sends monitoring information to the fiber grating temperature demodulator on the front side, the fiber grating temperature measuring sensor on the rear side of the demarcation point sends monitoring information to the fiber grating temperature demodulator on the rear side, and the monitoring information can be realized by setting the light emission direction of the fiber grating temperature measuring sensor in the optical cable; in another embodiment, the fiber grating array temperature measuring optical cable 3 adopts a split arrangement mode and comprises a plurality of temperature measuring cable sections, the end parts of two adjacent temperature measuring cable sections are abutted or the two adjacent temperature measuring cable sections are partially overlapped, the effect of the overall-length covering arrangement of the ballastless track can be realized, and the overall-line temperature monitoring of the ballastless track can be realized. Preferably, each station is provided with a fiber grating temperature demodulator.
The temperature field monitoring system is further optimized, as shown in fig. 1 and fig. 3, the fiber grating array temperature measurement optical cable 3 includes at least one vertical temperature measurement section 311 and a plurality of vertical temperature measurement sections, the vertical temperature measurement section 311 is a U-shaped cable with the top end located in the track plate 11 and the bottom end located in the base plate 13, each vertical temperature measurement section is embedded in the track plate 11 and connected with the top end of the adjacent vertical temperature measurement section 311, and the vertical temperature measurement section 311 is respectively provided with at least one fiber grating temperature measurement sensor in the track plate 11, the mortar layer plate 12 and the base plate 13. Generally, the vertical temperature measuring section 311 includes two vertical line segments and a horizontal line segment, wherein two ends of the horizontal line segment are respectively connected to the bottom ends of the two vertical line segments, and obviously, the vertical temperature measuring section 311 is an integral continuous cable; in this embodiment, the vertical temperature measuring section 311 is used for monitoring the vertical temperature of the track structure, preferably, no fiber grating temperature measuring sensor is disposed in the horizontal line segment, and the horizontal line segment may be set to a smaller length, that is, a smaller distance is used between two vertical line segments.
The vertical temperature measuring section 311 can obtain the temperatures of the track slab 11, the mortar layer slab 12 and the base plate 13 at the corresponding measuring points, so as to obtain the vertical temperature gradient of the track structure, and judge whether the vertical temperature load of the track structure is in a normal range according to the vertical temperature gradient, so that a work department and the like 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. 3, each vertical line segment of the vertical temperature measuring section 311 is provided with at least one fiber bragg grating temperature measuring sensor in the track plate 11, the mortar layer plate 12 and the base plate 13, so that each vertical line segment can realize vertical temperature monitoring of the track structure, and the temperature information obtained by the two vertical line segments can be mutually proved, so that the accuracy of the monitoring result can be improved, 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 slab 12 and the base plate 13 are processed in the same way, and the accuracy and 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 measuring section 311 can be marked, so that the work department can conveniently and timely detect whether the vertical temperature measuring section 311 has faults or not, namely, the fault self-detection of the vertical temperature measuring section 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 plate 12 and the base plate 13.
In one embodiment, there are a plurality of vertical temperature measuring sections 311, and the distance between two adjacent vertical temperature measuring sections 311 is within a range of 5-10 m, and it is further preferable that one vertical temperature measuring 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 measuring section 311, the distance between the fiber grating temperature measuring sensor in the base plate 13 and the surface of the track plate is within the range of 220-350 mm, the distance between the fiber grating temperature measuring sensor in the mortar layer plate 12 and the surface of the track plate is within the range of 190-220 mm, and the distance between the fiber grating temperature measuring sensor in the track plate 11 and the surface of the track plate is within the range of 80-150 mm. In alternative embodiments: (1) in the roadbed section of the CRTSII type plate ballastless track, the longitudinal length of a vertical temperature measuring point 31 is 800mm, the distance between a fiber grating temperature measuring sensor in a track plate 11 and the surface of the track plate is 100mm, the distance between the fiber grating temperature measuring sensor in a mortar laminate 12 and the surface of the track plate is 215mm, and the distance between the fiber grating temperature measuring sensor in a 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 laminate 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 type slab ballastless track tunnel 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 laminate 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.
For the arrangement of the vertical temperature measuring sections 311, it is preferable that, corresponding to the position of each vertical temperature measuring section 311, a grouting hole 312 is formed in the track plate 11 and the grouting hole 312 extends into the base plate 13, and the vertical temperature measuring section 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 section 311 in the grouting hole 312 is ensured, and meanwhile, the vertical temperature measuring section 311 can be well protected.
Vertical temperature measuring points 31 are arranged on the ballastless track at proper intervals, the longitudinal temperature gradient of the track structure can be obtained according to temperature data fed back by the vertical temperature measuring points 31, and whether the longitudinal temperature load of the track structure is in a normal range can be judged according to the longitudinal temperature gradient, so that a work department and the like can further detect and maintain the ballastless track in time. When the number of the vertical temperature measuring points 31 is enough, the fiber bragg grating temperature measuring sensor is not arranged in the longitudinal temperature measuring section, and the fiber bragg grating temperature measuring sensor is only used for signal transmission; obviously, preferably, the fiber bragg grating temperature measurement sensor is also arranged in the longitudinal temperature measurement section, so that longitudinal temperature gradient data of the track structure is richer, the judgment on the longitudinal temperature load condition of the track structure is more accurate and reliable, particularly, the longitudinal temperature information of the track slab 11 is more comprehensive, the health monitoring of the track slab 11 is facilitated, the monitoring on the diseases such as vertical upwarp deformation of the track slab 11 is included, and the occurrence of conditions such as missing detection and misjudgment can be reduced.
For the arrangement of the longitudinal temperature measuring section, it is preferable that a longitudinal monitoring groove is formed in the track slab 11 to bury the longitudinal temperature measuring section, and the longitudinal monitoring groove is filled with concrete. Likewise, the concrete poured in the longitudinal monitoring groove is preferably high-strength and quick-setting concrete.
Generally, the base plate 13, the mortar layer plate 12 and the track plate 11 are of a layered structure, for example, each layer is sequentially poured, the binding property, the integrity and the like among the layers will affect the health condition of the track structure, and the inter-layer diseases are also one of the main diseases of the track structure.
The longitudinal monitoring grooves are obviously communicated with the adjacent grouting holes 312, further, concrete is poured in the longitudinal monitoring grooves and the grouting holes 312 at the same time, at least concrete is poured in each grouting hole 312 and two adjacent longitudinal monitoring grooves 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.
If necessary, the base plate 13 and the mortar layer plate 12 can be provided with the consolidation reinforcing steel bars which protrude into the grouting holes 312, and the track plate 11 can be provided with the consolidation reinforcing steel bars which protrude into the grouting holes 312 and the longitudinal monitoring grooves, so that the binding property between post-cast concrete (i.e. concrete in the grouting holes 312 and the longitudinal monitoring grooves) and the prior track structure can be further improved.
In another preferred embodiment, for the cast-in-place track slab 11, the fiber bragg grating array temperature measuring optical cable 3 is laid simultaneously when the track slab 11 is cast in place, wherein the cable (including the longitudinal temperature measuring section) for collecting the temperature information of the track slab is consolidated by the track slab concrete. Vertical wiring holes are formed in the base plate 13 and the mortar layer plate 12 which are poured in advance to arrange the vertical temperature measuring sections 311, and when the track plate 11 is poured, concrete enters the vertical wiring holes at the same time to fix the fiber bragg grating temperature measuring optical cable 3; in the scheme, the structural integrity and the cooperative stress among the track plate 11, the base plate 13 and the mortar layer plate 12 are better. Further preferably, when the track slab 11 is cast in place, the fiber grating array temperature measurement optical cable 3 is also used for collecting the temperature state in the track slab forming process, and according to the feedback information of the fiber grating array temperature measurement optical cable 3, a constructor can conveniently take proper maintenance measures for track slab concrete, so that the construction quality of the track slab 11 is improved.
Preferably, the fiber grating array temperature measuring optical cable 3 is arranged in the middle of the track, namely, between two rows of tracks.
Based on the ballastless track full-line temperature field monitoring system, the temperature information of the track structure is collected through the fiber bragg grating array temperature measuring optical cable 3, and the temperature information of the track structure at least comprises the temperature information of the track slab 11; the fiber grating temperature demodulator receives the temperature information sent by the fiber grating array temperature measuring optical cable 3, demodulates the temperature information into a demodulation signal and sends the demodulation signal to the background processor; and the background processor analyzes and obtains the temperature load of the track structure and judges whether the temperature load is in a normal range, and if not, the background processor guides a work department to detect and maintain the ballastless track. It can be understood that, by means of the above system and method for monitoring the ballastless track full-line temperature field, the deformation of the track slab 11 due to the influence of temperature and the step deformation of the track structure due to the influence of temperature (for example, the deformation of the base plate 13, the clearance between the mortar layer slab 12 and the base plate 13 as well as between the mortar layer slab 12 and the track slab 11) can be better grasped, and the track slab buckling deformation can be conveniently and accurately grasped.
In addition, for the track slab 11 of cast-in-place construction, the fiber grating array temperature measurement optical cable 3 is laid synchronously when the track slab 11 is cast in place, and the temperature state in the track slab forming process is monitored through the fiber grating array temperature measurement optical cable 3, so that constructors are guided to perform corresponding maintenance operation on track slab concrete, and the construction quality of the track slab 11 is improved. The optical fiber grating temperature demodulator can be configured at a corresponding position according to the construction progress of the track slab 11 and connected with the optical fiber grating array temperature measurement optical cable 3 so as to realize real-time monitoring and data processing. Particularly, based on the mode, the initial stress condition, the initial health condition and the like of the track slab 11 can be well mastered, initial basic information is provided for subsequent warp deformation monitoring of the track slab 11, the trend of the warp deformation disease development of the track slab can be conveniently and accurately judged, and important monitoring can be performed on the track slab which is easy to cause the warp deformation disease.
Example four
The slab ballastless track provided by the second embodiment and the track slab warp deformation monitoring method in the first embodiment are further optimized in this embodiment.
Referring to fig. 1 and 4, in the slab ballastless track, a fiber grating array vibration optical cable 4 integrated with a plurality of fiber grating vibration sensors is arranged on a track slab 11, and the fiber grating array vibration optical cable 4 is continuously arranged along the whole length of the track slab 11. Obviously, the fiber grating array vibration optical cable 4 is configured correspondingly, and is used for collecting vibration information of the track slab 11 and sending the vibration information to the fiber grating vibration demodulator, and the fiber grating vibration demodulator is used for receiving the vibration information sent by the fiber grating array vibration optical cable 4, demodulating the vibration information into a demodulation signal and sending the demodulation signal to the background processor.
The fiber grating array vibration optical cable 4 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 as required), 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 is also the existing equipment; it may be electrically connected or communicatively connected to the background processor, which is conventional. Considering that the length of the whole ballastless track is long, the fiber bragg grating vibration demodulator is preferably provided in plurality, so as to ensure the accuracy and reliability of vibration data. Preferably, each fiber grating vibration demodulator 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 4 is continuously arranged along the whole line of the ballastless track, that is, two adjacent fiber grating vibration demodulators 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 on the front side, the fiber grating vibration sensor on the rear side of the demarcation point sends monitoring information to the fiber grating vibration demodulator on the rear side, and the monitoring information 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 4 adopts a split arrangement mode, and includes a plurality of vibration monitoring cable sections, the end parts of two adjacent vibration monitoring cable sections are offset or the two adjacent vibration monitoring cable sections are partially overlapped, so that the effect of the overall-length covering arrangement of the ballastless track can be realized, and the overall-line vibration monitoring of the ballastless track can be realized. Preferably, each station is provided with a fiber grating vibration demodulator.
Based on the fiber bragg grating array vibration optical cable 4, acquiring vibration acceleration at each vibration measurement point on the track slab 11 through the fiber bragg grating array vibration optical cable 4;
establishing a vibration acceleration-time relation data set for each vibration measuring point, comparing the vibration acceleration at the current time with the vibration acceleration at the historical time, and judging whether a mortar layer of the track structure has a gap separation 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 judging whether the track structure has a mortar layer void condition or not according to the comparison between the fundamental frequency mode at the current time and the fundamental frequency mode at the historical time.
That is to say, the background processor is used for acquiring a demodulation signal sent by the fiber grating vibration demodulator, establishing a vibration acceleration-time relation data set for each vibration measuring point, and judging whether a gap condition occurs in a mortar layer 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, 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 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 bed plate (track plate 11) 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.
Particularly, the accuracy of judging the interlayer diseases of the track structure can be further improved by combining the mode of monitoring the vertical temperature gradient and the longitudinal temperature gradient of the track structure through the fiber bragg grating array temperature measuring optical cable 3; 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.
As shown in FIG. 4, the number and distribution of the vibration measuring points can be set according to specific situations. 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. 4, for the arrangement of the fiber grating array vibration optical cable 4, 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 4, 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 4 can also be laid simultaneously when the track plate 11 is poured.
Obviously, by means of the track slab vibration monitoring scheme, whether the track structure has defects such as a mortar layer void condition or not is judged, and accordingly error deformation caused by the mortar layer void factor can be eliminated in track slab buckling deformation monitoring.
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 (8)
1. A track slab warp deformation monitoring system, comprising:
the monitoring unit comprises two fiber grating array stress optical cables integrated with a plurality of fiber grating stress sensors, the two stress optical cables in the same group are arranged in a high-low mode at each buckling deformation monitoring point, and the two stress optical cables are arranged in an X-shaped crossed mode between two buckling deformation monitoring points which are longitudinally adjacent;
and the data demodulator is used for receiving the stress information sent by the stress optical cable, demodulating the stress information into a demodulation signal and sending the demodulation signal to the background processor.
2. The track slab warp deformation monitoring system of claim 1 wherein: each stress optical cable is continuously arranged along the whole length of the track plate.
3. The track slab warp deformation monitoring system of claim 1 wherein: each stress optical cable is arranged on the surface of the track plate.
4. The track slab warp deformation monitoring system of claim 3, wherein: the top end of the stress optical cable does not exceed the height of the rail surface of the steel rail.
5. The track slab warp deformation monitoring system of claim 3, wherein: the monitoring unit further comprises a protective cover, wherein the protective cover is arranged on the surface of the track plate and covers the two corresponding stress optical cables.
6. The track slab warp deformation monitoring system of claim 1 wherein: the distance between two adjacent buckling deformation monitoring points is 5-7 m.
7. A track slab warp deformation monitoring method, which is carried out based on the track slab warp deformation monitoring system as claimed in any one of claims 1 to 6;
when the buckling deformation monitoring point is buckled and deformed, the two stress optical cables in the same group generate a differential effect, and a monitoring deformation is obtained based on the differential effect;
and eliminating error deformation on the basis of the monitored deformation to judge the vertical buckling deformation condition of the track plate, wherein the error deformation comprises error deformation of the track plate caused by temperature influence and error deformation caused by deformation in other directions.
8. A ballastless track, wherein the track slab buckling deformation monitoring system according to any one of claims 1 to 7 is configured on a track slab.
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| CN202111154104.4A CN114111611B (en) | 2021-09-29 | Ballastless track, track slab buckling deformation monitoring system and method |
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| CN202111154104.4A CN114111611B (en) | 2021-09-29 | Ballastless track, track slab buckling deformation monitoring system and method |
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