阅读说明：本技术 一种无砟轨道结构状态监测方法 (Ballastless track structure state monitoring method ) 是由 朱彬 许国平 杨艳丽 孙立 李秋义 林超 梅琴 李路遥 张世杰 叶松 于 2021-09-29 设计创作，主要内容包括：本发明涉及一种无砟轨道结构状态监测方法,在无砟轨道施工过程中,在底座板内和/或轨道板内配置光纤光栅阵列测温光缆和光纤光栅阵列应力光缆,通过光纤光栅阵列测温光缆监测底座板/轨道板成型过程中的温度状态,以及通过光纤光栅阵列应力光缆监测底座板/轨道板成型过程中的应力状态,根据所获得的温度状态和应力状态判断底座板/轨道板的质量是否符合要求以及对底座板混凝土//轨道板混凝土进行相应的养护操作。本发明能有效地提高无砟轨道的施工质量,采用光纤光栅阵列光缆进行相应的监测工作,不仅现场安装方便,数据通道少,对底座板/轨道板的混凝土结构影响较小,而且数据采集可靠性和准确度高。(The invention relates to a method for monitoring the structural state of a ballastless track, which is characterized in that in the construction process of the ballastless track, a fiber bragg grating array temperature measuring optical cable and a fiber bragg grating array stress optical cable are arranged in a base plate and/or a track plate, the temperature state in the forming process of the base plate/the track plate is monitored through the fiber bragg grating array temperature measuring optical cable, the stress state in the forming process of the base plate/the track plate is monitored through the fiber bragg grating array stress optical cable, and whether the quality of the base plate/the track plate meets the requirements or not and corresponding maintenance operation is carried out on base plate concrete// track plate concrete according to the obtained temperature state and stress state. The invention can effectively improve the construction quality of the ballastless track, adopts the optical fiber grating array optical cable to carry out corresponding monitoring work, has convenient field installation, less data channels, less influence on the concrete structure of the bed plate/track plate and high data acquisition reliability and accuracy.)

1. A ballastless track structure state monitoring method is characterized by comprising the steps of monitoring the structure state in the ballastless track construction process,

the structure state monitoring in the ballastless track construction process specifically comprises the following steps:

when the base plate is constructed, a first fiber grating array temperature measuring optical cable and a first fiber grating array stress optical cable are fixed in a base plate template, then concrete is poured, the temperature state of the base plate in the forming process is monitored through the first fiber grating array temperature measuring optical cable, the stress state of the base plate in the forming process is monitored through the first fiber grating array stress optical cable, whether the quality of the base plate meets the requirements or not is judged according to the obtained temperature state and stress state of the base plate in the forming process, and corresponding maintenance operation is carried out on the base plate concrete;

and/or when the track slab is constructed, fixing a second fiber grating array temperature measuring optical cable and a second fiber grating array stress optical cable in a track slab template, pouring concrete, monitoring the temperature state of the track slab in the molding process through the second fiber grating array temperature measuring optical cable, monitoring the stress state of the track slab in the molding process through the second fiber grating array stress optical cable, judging whether the quality of the track slab meets the requirement or not according to the obtained temperature state and stress state of the track slab in the molding process, and performing corresponding maintenance operation on the track slab concrete.

2. The ballastless track structure state monitoring method of claim 1, wherein: when a first fiber grating array temperature measuring optical cable and a first fiber grating array stress optical cable are configured in the base plate, the first fiber grating array temperature measuring optical cable and the first fiber grating array stress optical cable are longitudinally arranged on the base plate along the rail in the full length mode.

3. The ballastless track structure state monitoring method of claim 1, wherein: when a second fiber grating array temperature measuring optical cable and a second fiber grating array stress optical cable are configured in the track plate, the second fiber grating array temperature measuring optical cable and the second fiber grating array stress optical cable are arranged on the track plate along the longitudinal direction of the track in a full-length mode.

4. The ballastless track structure state monitoring method of claim 1, further comprising structure state monitoring during ballastless track operation,

the structure state monitoring in the ballastless track operation process specifically comprises the following steps:

when a first fiber grating array temperature measuring optical cable and a first fiber grating array stress optical cable are arranged in the base plate, whether the track structure is healthy or not is judged according to the temperature information and the stress information in the operation process of the base plate, and if not, the track structure is maintained according to the temperature information and the stress information in the operation process of the base plate.

5. The ballastless track structure state monitoring method of claim 1, further comprising structure state monitoring during ballastless track operation,

the structure state monitoring in the ballastless track operation process specifically comprises the following steps:

when a second fiber grating array temperature measuring optical cable and a second fiber grating array stress optical cable are configured in the track slab, the temperature information of the track slab is monitored through the second fiber grating array temperature measuring optical cable, the stress information of the track slab is monitored through the second fiber grating array stress optical cable, whether the track slab is healthy or not is judged according to the obtained temperature information and the obtained stress information in the operation process of the track slab, if not, the track slab is subjected to instructive maintenance according to the obtained temperature information and the obtained stress information in the operation process of the track slab, and the instructive maintenance comprises analyzing and determining a disease occurrence point of the track slab and a disease type of the track slab.

Technical Field

The invention belongs to the technical field of rail traffic engineering, and particularly relates to a ballastless track structure state monitoring method.

Background

The double-block ballastless track has a simple structure and mature technology, and is one of the main ballastless track structural types in China. The track plate and the bed plate of the CRTS double-block ballastless track both need to be cast in situ, and the curing temperature of the ballastless track concrete is generally preferably 10-25 ℃; during winter construction, the concrete should be kept warm in time when the temperature is lower than 5 ℃, and during summer construction, the concrete should be sprinkled to reduce the temperature when the temperature is higher than 30 ℃. In addition, generally, before the strength of the base plate concrete does not reach 75% of the design strength, various vehicles are strictly prohibited to pass on the base, and after the strength of the base plate concrete reaches 75% of the design strength, an intermediate isolation layer can be constructed and an elastic cushion layer can be installed; and strictly prohibiting the vehicle running on the track bed and colliding with the track parts before the strength of the track slab concrete does not reach 75% of the design strength.

At present, the cast-in-place concrete maintenance of the base plate and the track plate is generally operated according to the experience of constructors and the ambient temperature, the mode is relatively extensive, fine control is difficult to carry out, the quality of the base plate and the track plate is influenced, and the long-term service state of the track structure is influenced. Moreover, the strength of the concrete is generally judged according to the experience of constructors, and when the detection equipment is adopted, on one hand, the efficiency is low, the labor intensity is high, on the other hand, the internal state of the concrete structure cannot be accurately known, so that the judgment of the strength of the concrete has errors, the next procedure is started when the requirement is not met, and the internal damage of the concrete structure is easily caused.

In addition, the plate-type ballastless track is greatly influenced by temperature load, and the interlayer bonding performance of the track structure is gradually degraded along with the increase of the service time of the line; under the action of vertical temperature load, the track plate can be vertically arched and deformed, and a gap between the track plate and the mortar layer is easy to appear after a long time; 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 in extreme cases, the wide and narrow seams of the track plates are crushed by extrusion, and the track plates are arched and deformed. Therefore, corresponding track structure state detection equipment (such as gap detection, plate shape detection and the like) needs to be configured, and regular or irregular detection is carried out by a work department, so that the equipment cost is high, and the detection efficiency is low; and because the high-speed rail lines are long and are distributed in different climatic zones across the country, the interpretation of the rail structure temperature by the railway service department at present is mainly based on local weather forecast, although the rail structure temperature change of a monitoring point can be mastered by adopting a local section temperature monitoring method, the condition of the rail plate temperature field of the whole line is still difficult to judge, the information basis on which the judgment can be based is poor, the problems of judgment omission, misjudgment and the like exist, and the detection and maintenance are not favorably and timely carried out by the service department.

Disclosure of Invention

The invention relates to a ballastless track structure state monitoring method which can at least solve part of defects in the prior art.

The invention relates to a method for monitoring the structural state of a ballastless track, which comprises the steps of monitoring the structural state in the ballastless track construction process,

the structure state monitoring in the ballastless track construction process specifically comprises the following steps:

when the base plate is constructed, a first fiber grating array temperature measuring optical cable and a first fiber grating array stress optical cable are fixed in a base plate template, then concrete is poured, the temperature state of the base plate in the forming process is monitored through the first fiber grating array temperature measuring optical cable, the stress state of the base plate in the forming process is monitored through the first fiber grating array stress optical cable, whether the quality of the base plate meets the requirements or not is judged according to the obtained temperature state and stress state of the base plate in the forming process, and corresponding maintenance operation is carried out on the base plate concrete;

and/or when the track slab is constructed, fixing a second fiber grating array temperature measuring optical cable and a second fiber grating array stress optical cable in a track slab template, pouring concrete, monitoring the temperature state of the track slab in the molding process through the second fiber grating array temperature measuring optical cable, monitoring the stress state of the track slab in the molding process through the second fiber grating array stress optical cable, judging whether the quality of the track slab meets the requirement or not according to the obtained temperature state and stress state of the track slab in the molding process, and performing corresponding maintenance operation on the track slab concrete.

In an embodiment, when a first fiber grating array temperature measuring cable and a first fiber grating array stress cable are disposed in the base plate, the first fiber grating array temperature measuring cable and the first fiber grating array stress cable are both longitudinally arranged along the rail on the base plate along the full length.

In an embodiment, when a second fiber grating array temperature measuring optical cable and a second fiber grating array stress optical cable are disposed in the track slab, both the second fiber grating array temperature measuring optical cable and the second fiber grating array stress optical cable are disposed on the track slab along the longitudinal direction of the track.

As one of the implementation modes, the ballastless track structure state monitoring method further comprises the step of monitoring the structure state in the ballastless track operation process,

the structure state monitoring in the ballastless track operation process specifically comprises the following steps:

when a first fiber grating array temperature measuring optical cable and a first fiber grating array stress optical cable are arranged in the base plate, whether the track structure is healthy or not is judged according to the temperature information and the stress information in the operation process of the base plate, and if not, the track structure is maintained according to the temperature information and the stress information in the operation process of the base plate.

As one of the implementation modes, the ballastless track structure state monitoring method further comprises the step of monitoring the structure state in the ballastless track operation process,

the structure state monitoring in the ballastless track operation process specifically comprises the following steps:

when a second fiber grating array temperature measuring optical cable and a second fiber grating array stress optical cable are configured in the track slab, the temperature information of the track slab is monitored through the second fiber grating array temperature measuring optical cable, the stress information of the track slab is monitored through the second fiber grating array stress optical cable, whether the track slab is healthy or not is judged according to the obtained temperature information and the obtained stress information in the operation process of the track slab, if not, the track slab is subjected to instructive maintenance according to the obtained temperature information and the obtained stress information in the operation process of the track slab, and the instructive maintenance comprises analyzing and determining a disease occurrence point of the track slab and a disease type of the track slab.

The invention has at least the following beneficial effects:

according to the invention, the fiber bragg grating array temperature measuring optical cable and the fiber bragg grating array stress optical cable are arranged in the base plate and/or the track plate, so that the temperature state and the stress state in the forming process of the base plate and/or the track plate can be monitored in real time, and a constructor can conveniently and accurately judge whether the quality of the base plate and/or the track plate meets the requirement or not in time, so that the corresponding maintenance operation can be carried out on concrete, the construction quality of a ballastless track is effectively improved, and the engineering loss and the construction cost are reduced; the optical fiber grating array optical cable is adopted to carry out corresponding monitoring work, so that the field installation is convenient, the data channel is few, the influence on the concrete structure of the base plate/track plate is small, the data acquisition reliability and accuracy are high, and the accuracy and reliability of the monitoring of the track structure state are correspondingly improved.

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 diagram of arrangement of temperature measuring optical cables in a ballastless track 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 fig. 2, an embodiment of the present invention provides a method for monitoring a structural state of a ballastless track, including monitoring a structural state during a ballastless track construction process,

the structure state monitoring in the ballastless track construction process specifically comprises the following steps:

when the base plate 13 is constructed, a first fiber grating array temperature measuring optical cable 2 and a first fiber grating array stress optical cable are fixed in a base plate template, concrete is poured, the temperature state of the base plate 13 in the forming process is monitored through the first fiber grating array temperature measuring optical cable 2, the stress state of the base plate 13 in the forming process is monitored through the first fiber grating array stress optical cable, whether the quality of the base plate meets the requirement or not is judged according to the obtained temperature state and stress state of the base plate 13 in the forming process, and corresponding maintenance operation is carried out on the base plate concrete;

and/or when the track slab 11 is constructed, the concrete is poured after the second fiber grating array temperature measuring optical cable 3 and the second fiber grating array stress optical cable 4 are fixed in the track slab template, the temperature state of the track slab 11 in the forming process is monitored through the second fiber grating array temperature measuring optical cable 3, the stress state of the track slab 11 in the forming process is monitored through the second fiber grating array stress optical cable 4, whether the quality of the track slab meets the requirement or not is judged according to the obtained temperature state and stress state of the track slab 11 in the forming process, and corresponding maintenance operation is carried out on the track slab concrete.

The fiber grating array temperature measurement optical cable is a cable with a plurality of fiber grating temperature measurement sensors integrated in a single optical cable, the fiber grating array stress optical cable is a cable with a plurality of fiber grating stress sensors integrated in a single optical cable, and the fiber grating array temperature measurement optical cable is an existing product, has the characteristics of wide monitoring coverage range (capable of covering more than 10km according to needs), high measurement precision, small sensing unit interval (capable of being 1cm at the minimum interval) and the like, and is not repeated in the specific structure.

Generally, when the fiber grating array temperature measuring optical cable and the fiber grating array stress optical cable work, the data demodulator is configured accordingly, for example, the fiber grating temperature demodulator is used for receiving the temperature information sent by the fiber grating array temperature measuring optical cable and demodulating the temperature information into a demodulation signal to be sent to the background processor, and the fiber grating stress demodulator is used for receiving the stress information sent by the fiber grating array stress optical cable and demodulating the stress information into a demodulation signal to be sent to the background processor. The data demodulator and the background processor may be connected electrically or in communication, which is a conventional technique.

In the embodiment, the fiber bragg grating array temperature measuring optical cable and the fiber bragg grating array stress optical cable are arranged in the base plate 13 and/or the track plate 11, so that the temperature state and the stress state in the forming process of the base plate 13 and/or the track plate 11 can be monitored in real time, and a constructor can conveniently and accurately judge whether the quality of the base plate 13 and/or the track plate meets the requirement or not in time, so that the corresponding maintenance operation can be performed on concrete, the construction quality of a ballastless track is effectively improved, and the engineering loss and the construction cost are reduced; the optical fiber grating array optical cable is adopted to carry out corresponding monitoring work, so that the field installation is convenient, the data channel is few, the influence on the concrete structure of the base plate 13/track plate 11 is small, the data acquisition reliability and accuracy are high, and the accuracy and reliability of the monitoring of the track structure state are correspondingly improved.

Specifically, during the construction of the ballastless track, the base plate 13 is constructed first, and the difference between the real-time temperature of the concrete of the base plate and the concrete curing temperature is judged by adopting the temperature state monitoring and stress state monitoring means, so as to guide the constructors to perform corresponding curing operation. For example, the curing temperature of the ballastless track concrete is preferably 10-25 ℃, and the heat preservation is carried out in time when the temperature of the concrete is lower than 5 ℃ during winter construction; and during construction in summer, spraying water to reduce the temperature of the concrete when the temperature of the concrete is higher than 30 ℃. After the base plate 13 is poured, various vehicles are strictly prohibited from passing through the base plate 13 before the concrete does not reach 75% of the design strength; after the concrete strength reaches 75% of the design strength, the intermediate structure layer 12 (an intermediate isolation layer, an elastic cushion layer and the like) can be constructed. After the construction of the intermediate structure layer 12 is completed, the track slab 11 is constructed, and the difference between the real-time temperature of the concrete of the track slab and the concrete curing temperature is judged by adopting the temperature state monitoring and stress state monitoring means so as to guide constructors to perform corresponding curing operation. After the track slab 11 is poured, the track slab 11 is strictly prohibited to drive and mount the track component before the concrete of the track slab does not reach 75% of the design strength.

In one embodiment, the method for monitoring the structure state of the ballastless track further includes monitoring the structure state of the ballastless track in an operation process, and specifically includes:

when a first fiber grating array temperature measuring optical cable 2 and a first fiber grating array stress optical cable are configured in the base plate 13, the temperature information of the base plate 13 is monitored through the first fiber grating array temperature measuring optical cable 2, the stress information of the base plate 13 is monitored through the first fiber grating array stress optical cable, whether the track structure is healthy or not is judged according to the obtained temperature information and stress information in the operation process of the base plate 13, and if not, the track structure is maintained according to the obtained temperature information and stress information in the operation process of the base plate 13.

In one embodiment, the method for monitoring the structure state of the ballastless track further includes monitoring the structure state of the ballastless track in an operation process, and specifically includes:

when a second fiber grating array temperature measuring optical cable 3 and a second fiber grating array stress optical cable 4 are configured in the track slab 11, the temperature information of the track slab 11 is monitored through the second fiber grating array temperature measuring optical cable 3, the stress information of the track slab 11 is monitored through the second fiber grating array stress optical cable 4, whether the track slab 11 is healthy or not is judged according to the obtained temperature information and the obtained stress information in the operation process of the track slab 11, if not, the track slab 11 is subjected to instructive maintenance according to the obtained temperature information and the obtained stress information in the operation process of the track slab 11, and the instructive maintenance comprises analyzing and determining a disease occurrence point of the track slab 11 and a disease type of the track slab 11.

Preferably, the fiber grating array temperature measuring optical cable and the fiber grating array stress optical cable are arranged in the base plate 13 and the track plate 11, so that the structural states of the base plate 13 and the track plate 11 can be monitored in real time in the operation process of the ballastless track.

Based on the method, the same fiber bragg grating array optical cable can be used for simultaneously realizing the structural state monitoring in the ballastless track construction process and the structural state monitoring in the ballastless track operation process, the engineering cost can be obviously reduced, the structural safety of the ballastless track is improved, the monitoring products can be prevented from being laid in the ballastless track after the ballastless track is constructed, and the disturbance and the damage to the ballastless track structure are reduced.

Preferably, when the first fiber grating array temperature measuring optical cable 2 and the first fiber grating array stress optical cable are configured in the base plate 13, the first fiber grating array temperature measuring optical cable 2 and the first fiber grating array stress optical cable are both longitudinally arranged on the base plate 13 along the rail in the full length.

Similarly, when a second fiber grating array temperature measuring optical cable 3 and a second fiber grating array stress optical cable 4 are configured in the track plate 11, both the second fiber grating array temperature measuring optical cable 3 and the second fiber grating array stress optical cable 4 are arranged on the track plate 11 along the longitudinal direction of the track in the full length.

In one embodiment, the first fiber grating array temperature measuring optical cable 2 and the first fiber grating array stress optical cable are bound on the longitudinal structural steel bars of the base plate 13; similarly, the second fiber grating array temperature measuring optical cable 3 and the second fiber grating array stress optical cable 4 are bound on the longitudinal structural steel bars of the track plate 11. Obviously, the installation mode of the optical cable is easy to operate, and the reliability of the optical cable fixing structure is high.

The fiber grating array temperature measuring optical cable and the fiber grating array stress optical cable can be continuous optical cables, namely, the optical cables are continuously arranged along the whole line of the ballastless track. In another embodiment, the fiber grating array temperature measuring optical cable and the fiber grating array stress optical cable are arranged in a split mode and comprise a plurality of fiber grating array cable sections, the end parts of two adjacent fiber grating array cable sections are abutted or the two adjacent fiber grating array cable sections are partially overlapped, the effect of overall-length covering and arrangement of the ballastless track can be achieved, and the overall-line state monitoring of the ballastless track can be achieved.

Considering that the whole line length of the ballastless track is long, the fiber bragg grating temperature demodulator and the fiber bragg grating stress demodulator are preferably arranged in a plurality of sets so as to ensure the accuracy and reliability of data acquisition and processing. Preferably, each data demodulator is used for acquiring monitoring information of two sections of cables on the front side and the rear side of the data demodulator; for the condition that the optical fiber grating array optical cable is continuously arranged along the whole line of the ballastless track, two adjacent data demodulation instruments are connected in series by a single cable, in the single series cable, a certain point is taken as a demarcation point, each optical fiber grating sensor on the front side of the demarcation point sends monitoring information to the data demodulation instrument on the front side, each optical fiber grating sensor on the rear side of the demarcation point sends monitoring information to the data demodulation instrument on the rear side, and the arrangement can be realized by the arrangement of the light emission direction of the optical fiber grating sensors in the optical cable. Preferably, each station is provided with a fiber grating temperature demodulator and a fiber grating stress demodulator.

In the operation monitoring process of the ballastless track, the longitudinal temperature gradient of the base plate 13/track plate 11 can be monitored through the fiber bragg grating array temperature measuring optical cable, 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. The stress condition of the stress measuring point of the base plate 13/track plate 11 can be intuitively known through the fiber bragg grating array stress optical cable, and when the stress sudden change or creep occurs compared with historical data, early warning can be timely carried out, so that further detection and maintenance can be conveniently carried out on the ballastless track by a workshop and the like.

In a further preferred embodiment, as shown in fig. 2, the second fiber grating array temperature measuring optical cable 3 disposed in the track slab 11 includes at least one vertical temperature measuring section 311 and a plurality of longitudinal temperature measuring sections, the vertical temperature measuring section 311 is a U-shaped cable with a top end located in the track slab 11 and a bottom end located in the base plate 13, each longitudinal temperature measuring section is embedded in the track slab 11 and connected to a top end of an adjacent vertical temperature measuring section 311, and the vertical temperature measuring section 311 has at least one fiber grating temperature measuring sensor in the track slab 11, the intermediate structure layer 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 intermediate structure layer 12 and the base plate 13 at the corresponding measuring point, 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. 2, each vertical line segment of the vertical temperature measuring section 311 has at least one fiber grating temperature measuring sensor in the track slab 11, the intermediate structure layer 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 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 intermediate structure layer 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 intermediate structure layer 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 the range of 5-10 m, and it is further preferable that one vertical temperature measuring point 31 is arranged every 6-7 m.

For the arrangement of the vertical temperature measuring sections 311, preferably, as shown in fig. 2, when the track plate 11 is constructed, a placement hole 312 is pre-formed in the intermediate structure layer 12 corresponding to the position of each vertical temperature measuring section 311, the placement hole 312 extends into the base plate 13, and when the second fiber grating array temperature measuring optical cable 3 is installed (for example, bound to the longitudinal structural steel bars of the track plate 11), each vertical temperature measuring section 311 is embedded into the corresponding placement hole 312; when the track slab concrete is poured, the concrete synchronously enters each placement hole 312, and the second fiber bragg grating array temperature measuring optical cable 3 is fixed. In the above scheme, the integrated concrete column formed in the placement hole 312 can effectively improve structural integrity and cooperative stress performance among layers of the track structure, and can also better play a role in multidirectional constraint on the track slab 11, so that the health state and service life of the track structure can be correspondingly improved.

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.