Title of the invention: Civil engineering structure monitoring system, civil engineering structure monitoring device, civil engineering structure monitoring method, and non-temporary computer-readable medium.
Technical field
[0001]
This disclosure relates to a civil engineering structure monitoring system, a civil engineering structure monitoring device, a civil engineering structure monitoring method, and a non-temporary computer-readable medium.
Background technology
[0002]
Conventionally, abnormality detection of civil engineering structures such as tunnels and bridges is often performed manually. For example, a worker can judge an abnormality only visually or by the sound of hitting a civil engineering structure. I was judging the abnormality. However, when anomaly detection of a civil engineering structure is performed manually, it takes a lot of cost and time, and the discovery and countermeasure of the anomaly may be delayed.
Therefore, recently, a system for monitoring an abnormality in a civil engineering structure using an optical fiber has been proposed (for example, Patent Documents 1 and 2).
[0003]
In the technique described in Patent Document 1, a defect of a composite structure is detected by transmitting light through an optical fiber built in the composite structure (polymer, glass, etc.) and detecting stress or strain of the optical fiber. is doing. At this time, the quantum dots contained in the optical fiber cause a non-linear effect to increase the detection sensitivity.
[0004]
Further, in the technique described in Patent Document 2, a lock bolt is driven into the ceiling, wall surface, and bedrock of the underground space, and two pairs of optical fiber sensors are fixed to the lock bolt in a sill. The displacement of the lock bolt is calculated.
Prior art literature
Patent documents
[0005]
Patent Document 1: Japanese Unexamined Patent Publication No. 2014-052368
Patent Document 2: Japanese Unexamined Patent Publication No. 2009-294039
Outline of the invention
Problems to be solved by the invention
[0006]
However, in the techniques described in Patent Documents 1 and 2, although the state of the civil engineering structure in which a strong stress is applied to the optical fiber can be detected, the stress on the optical fiber such as deterioration of the civil engineering structure can be detected. There is a problem that it is difficult to detect a state that has almost no effect on the optical fiber.
[0007]
Therefore, the object of the present disclosure is a civil engineering structure monitoring system, a civil engineering structure monitoring device, a civil engineering structure monitoring method, and a non-temporary method capable of solving the above-mentioned problems and detecting the deterioration state of the civil engineering structure with high accuracy. The purpose is to provide a computer-readable medium.
Means to solve problems
[0008]
The civil engineering structure monitoring system based on one aspect is
Cables including optical fibers for communication laid in civil engineering structures,
A receiving unit that receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable.
Based on the pattern, the detection unit that detects the deterioration state of the civil engineering structure,
Equipped with.
[0009]
The civil engineering structure monitoring device according to one aspect is
A receiving unit that receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure.
Based on the pattern, the detection unit that detects the deterioration state of the civil engineering structure,
Equipped with.
[0010]
The civil engineering structure monitoring method according to one aspect is
It is a civil engineering structure monitoring method using a civil engineering structure monitoring device.
Receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure.
Based on the pattern, the deterioration state of the civil engineering structure is detected.
[0011]
The non-temporary computer-readable medium according to one aspect is
On the computer
A procedure for receiving an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure, and
Based on the pattern, the procedure for detecting the deterioration state of the civil engineering structure and
It is a non-temporary computer-readable medium that stores a program for executing.
The invention's effect
[0012]
According to the above aspect, the effect that the deteriorated state of the civil engineering structure can be detected with high accuracy can be obtained.
A brief description of the drawing
[0013]
[Fig. 1] Fig. 1 is a diagram showing an example of a configuration of a civil engineering structure monitoring system according to an embodiment.
[Fig. 2] Fig. 2 is a diagram showing an example of civil engineering structure information according to an embodiment.
FIG. 3 is a diagram showing an example of frequency characteristics of vibration data of a civil engineering structure used in the method A in the civil engineering structure monitoring system according to the embodiment.
FIG. 4 is a diagram showing another example of frequency characteristics of vibration data of a civil engineering structure used in the method A in the civil engineering structure monitoring system according to the embodiment.
FIG. 5 is a diagram showing an example of vibration data of a civil engineering structure used in the method B in the civil engineering structure monitoring system according to the embodiment.
FIG. 6 is a diagram showing another example of vibration data of a civil engineering structure used in the method B in the civil engineering structure monitoring system according to the embodiment.
FIG. 7 is a diagram showing an example of a monitoring point of a civil engineering structure used in the method C in the civil engineering structure monitoring system according to the embodiment.
FIG. 8 is a diagram showing an example of vibration data of a civil engineering structure used in the method C in the civil engineering structure monitoring system according to the embodiment.
FIG. 9 is a diagram showing an example of a method of laying an optical fiber cable in a civil engineering structure in the method C in the civil engineering structure monitoring system according to the embodiment.
FIG. 10 is a diagram showing another example of a method of laying an optical fiber cable in a civil engineering structure in the method C in the civil engineering structure monitoring system according to the embodiment.
FIG. 11 is a diagram showing still another example of a method of laying an optical fiber cable in a civil engineering structure in the method C in the civil engineering structure monitoring system according to the embodiment.
FIG. 12 is a diagram showing still another example of a method of laying an optical fiber cable in a civil engineering structure in the method C in the civil engineering structure monitoring system according to the embodiment.
FIG. 13 is a diagram showing an example of machine learning by method E in the civil engineering structure monitoring system according to the embodiment.
FIG. 14 is a diagram showing an example of deterioration level information according to an embodiment.
FIG. 15 is a block diagram showing an example of a hardware configuration of a computer that realizes a civil engineering structure monitoring device according to an embodiment.
[Fig. 16] Fig. 16 is a flow chart showing an example of an operation flow of a civil engineering structure monitoring system according to an embodiment.
FIG. 17 is a diagram showing an example of a method for detecting a sign of deterioration or damage of a civil engineering structure in a civil engineering structure monitoring system according to another embodiment.
FIG. 18 is a diagram showing an example of civil engineering structure information according to another embodiment.
FIG. 19 is a diagram showing an example of a civil engineering structure monitoring system according to another embodiment.
FIG. 20 is a diagram showing another example of a civil engineering structure monitoring system according to another embodiment.
FIG. 21 is a diagram showing an example of arrangement of a fiber sensing unit in a civil engineering structure monitoring system according to another embodiment.
FIG. 22 is a diagram showing another example of arrangement of a fiber sensing unit in a civil engineering structure monitoring system according to another embodiment.
FIG. 23 is a diagram showing still another example of the arrangement of the fiber sensing unit in the civil engineering structure monitoring system according to another embodiment.
FIG. 24 is a diagram showing still another example of the arrangement of the fiber sensing unit in the civil engineering structure monitoring system according to another embodiment.
25 is a diagram showing an example of the operation of the fiber sensing unit when the optical fiber cable is broken in the civil engineering structure monitoring system of FIG. 21. FIG.
FIG. 26 is a diagram showing an example of the operation of the fiber sensing unit when the optical fiber cable is broken in the civil engineering structure monitoring system of FIG. 22.
27 is a diagram showing an example of the operation of the fiber sensing unit when the optical fiber cable is broken in the civil engineering structure monitoring system of FIG. 24. FIG.
Embodiment for carrying out the invention
[0014]
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

First, with reference to FIG. 1, the configuration of the civil engineering structure monitoring system according to the present embodiment will be described. In FIG. 1, for the sake of simplification of the explanation, the civil engineering structure 10 is a tunnel civil engineering structure 10A (civil engineering structure number is A) and a bridge civil engineering structure 10B (civil engineering structure number is A). Only two of B) and are shown. However, the civil engineering structure 10 is not limited to tunnels and bridges, and may include roads, railroad tracks, and the like.
[0015]
As shown in FIG. 1, the civil engineering structure monitoring system according to the present embodiment detects the deterioration state of the civil engineering structure 10 (civil engineering structures 10A and 10B in FIG. 1), and is an optical fiber cable. 20 and a civil engineering structure monitoring device 33 are provided.
[0016]
The optical fiber cable 20 is laid in the civil engineering structure 10. At this time, at the position where the deterioration state of the civil engineering structure 10 is particularly desired to be detected, the optical fiber cable 20 may be densely installed, for example, by laying the optical fiber cable 20 while forming a loop. As a result, the detection rate of deterioration of the civil engineering structure 10 can be improved.
The optical fiber cable 20 is a cable configured by covering one or more optical fibers for communication, and one end thereof is routed inside the communication carrier station building 30.
[0017]
The civil engineering structure monitoring system according to the present embodiment detects the deterioration state of the civil engineering structure 10 by using the optical fiber sensing technology using the optical fiber as a sensor.
Specifically, inside the communication carrier station building 30, pulsed light is incident on the communication optical fiber included in the optical fiber cable 20. Then, as the pulsed light is transmitted through the communication optical fiber in the direction of the civil engineering structure 10, backscattered light is generated for each transmission distance. This backscattered light returns to the inside of the communication carrier station building 30 via the same communication optical fiber.
[0018]
Here, the civil engineering structure 10 vibrates or naturally vibrates due to ambient disturbance (for example, a train or an automobile passes through), and the vibration of the civil engineering structure 10 is transmitted to a communication optical fiber. Further, the pattern in which the civil engineering structure 10 vibrates differs depending on the deterioration state (deflection, corrosion, change in installation position, etc.) of the civil engineering structure 10.
[0019]
Therefore, the backscattered light returning to the inside of the communication carrier station building 30 includes a pattern according to the deterioration state of the civil engineering structure 10. In the example of FIG. 1, since the civil engineering structures 10A and 10B are provided, the backscattered light returning to the inside of the communication carrier station building 30 corresponds to the deterioration state of each of the civil engineering structures 10A and 10B. The pattern will be included.
[0020]
The civil engineering structure monitoring system according to the present embodiment utilizes the fact that the backward scattered light returning to the inside of the communication carrier station building 30 includes a pattern according to the deterioration state of the civil engineering structure 10. It detects the deterioration state of the civil engineering structure 10.
[0021]
Here, inside the communication carrier station building 30, the above-mentioned civil engineering structure monitoring device 33 is provided. The civil engineering structure monitoring device 33 is a newly installed facility for realizing the present embodiment.
[0022]
The civil engineering structure monitoring device 33 is a device having a function as an optical fiber sensing device and also having a function of detecting a deteriorated state of the civil engineering structure 10. Specifically, the civil engineering structure monitoring device 33 includes a fiber sensing unit 331 and a detection unit 332. The fiber sensing unit 331 is an example of a receiving unit.
[0023]
The fiber sensing unit 331 injects pulsed light into at least one communication optical fiber included in the optical fiber cable 20. This pulsed light is transmitted in the direction of the civil engineering structure 10. Further, the fiber sensing unit 331 receives backscattered light with respect to the pulsed light from the same communication optical fiber as the communication optical fiber incident with the pulsed light. This backscattered light is received from the direction of the civil engineering structure 10.
[0024]
At this time, as described above, the backscattered light received by the fiber sensing unit 331 responds to the deterioration state of the civil engineering structure 10. Includes a similar pattern. Further, in the example of FIG. 1, since the civil engineering structures 10A and 10B are provided, the fiber sensing unit 331 emits backscattered light including a pattern corresponding to each deterioration state of the civil engineering structures 10A and 10B in a time series. Receive.
[0025]
Therefore, when the fiber sensing unit 331 receives the backscattered light including the pattern corresponding to the deterioration state of the civil engineering structure 10, the fiber sensing unit 331 first identifies the civil engineering structure 10 in which the backscattered light is generated.
Then, the detection unit 332 detects the deteriorated state of the specified civil engineering structure 10 based on the pattern corresponding to the deteriorated state of the specified civil engineering structure 10.
[0026]
Therefore, in the following, first, when the fiber sensing unit 331 receives the backscattered light including the pattern corresponding to the deterioration state of the civil engineering structure 10, the method of specifying the civil engineering structure 10 in which the backscattered light is generated is specified. Will be explained.
[0027]
In the present embodiment, the fiber sensing unit 331 holds in advance the civil engineering structure information including the position information indicating the position of each civil engineering structure 10. FIG. 2 shows an example of civil engineering structure information. In FIG. 2, yy> xx. The fiber sensing unit 331 has a time difference between the time when the pulsed light is incident on the communication optical fiber and the time when the backward scattered light including the pattern corresponding to the deterioration state of the civil engineering structure 10 is received from the same communication optical fiber. Based on, the position where the backward scattered light is generated is calculated. At this time, the fiber sensing unit 331 calculates the generation position so that the smaller the time difference is, the closer it is to the fiber sensing unit 331. Then, the fiber sensing unit 331 identifies the civil engineering structure 10 in which the backward scattered light is generated by referring to the civil engineering structure information in FIG.
[0028]
In the example of FIG. 1, the fiber sensing unit 331 receives backscattered light including a pattern corresponding to each deterioration state of the civil engineering structures 10A and 10B in chronological order. Therefore, the fiber sensing unit 331 calculates the generation positions of these backscattered lights, respectively, and refers to the civil engineering structure information in FIG. As a result, the fiber sensing unit 331 identifies the backscattered light whose generation position coincides with the distance from the fiber sensing unit 331 to the civil engineering structure 10A as the backscattered light generated in the civil engineering structure 10A. Further, the fiber sensing unit 331 identifies the backscattered light whose generation position coincides with the distance from the fiber sensing unit 331 to the civil engineering structure 10B as the backscattered light generated in the civil engineering structure 10B.
[0029]
Subsequently, in the following, a method of detecting the deteriorated state of the specified civil engineering structure 10 by the detection unit 332 will be described.
(A) Method A
First, a method A for detecting the deteriorated state of the civil engineering structure 10 will be described with reference to FIGS. 3 and 4. 3 and 4 show frequency characteristics (horizontal axis is frequency, vertical axis are frequency) after FFT (Fast Fourier Transform) of vibration data (horizontal axis is time, vertical axis is intensity (amplitude)) of civil engineering structure 10. Intensity (amplitude)) is shown. Further, FIG. 3 shows the frequency characteristics of the normal civil engineering structure 10, and FIG. 4 shows the frequency characteristics of the deteriorated civil engineering structure 10.
[0030]
The fiber sensing unit 331 performs a process of identifying the civil engineering structure 10 in which the backscattered light received from the communication optical fiber is generated. Further, the fiber sensing unit 331 detects the backward scattered light by a distributed acoustic sensor, a distributed vibration sensor, a distributed temperature sensor, or the like. , Performs a process of detecting a vibration state, a temperature state, a sound state, and the like in the specified civil engineering structure 10.
Therefore, the detection unit 332 detects the pattern according to the deterioration state of the specified civil engineering structure 10 based on the processing result of the backscattered light by the fiber sensing unit 331. At this time, the detection unit 332 can detect the dynamic fluctuation pattern of the vibration by detecting, for example, the strength of the vibration generated in the civil engineering structure 10, the vibration position, the transition of the fluctuation of the frequency, and the like. It will be possible. Further, the detection unit 332 detects the complex unique pattern of the civil engineering structure 10 by also detecting the dynamic fluctuation pattern of the sound and the temperature generated in the civil engineering structure 10, and is in a deteriorated state with higher accuracy. Can be detected. Here, specifically, the frequency characteristics of the civil engineering structure 10 as shown in FIGS. 3 and 4 are detected.
[0031]
As shown in FIGS. 3 and 4, an intensity peak occurs in the frequency characteristics of the civil engineering structure 10. It is a dynamic fluctuation pattern in which the frequency at which this peak occurs differs depending on the deterioration state of the civil engineering structure 10. Specifically, in the frequency characteristics of the deteriorated civil engineering structure 10 (FIG. 4), the frequency at which the intensity peak occurs is higher than that of the normal civil engineering structure 10 (FIG. 3). It is shifting to the side.
[0032]
Therefore, when the detection unit 332 detects the deteriorated state of the civil engineering structure 10, it first detects the frequency characteristics of the civil engineering structure 10 (for example, FIGS. 3 and 4). Subsequently, the detection unit 332 detects the deterioration state of the civil engineering structure 10 based on the frequency at which the peak occurs in the frequency characteristics of the civil engineering structure 10. Further, the detection unit 332 may detect the deterioration level based on the magnitude of the shift amount shifted from the frequency at which the peak occurs in the frequency characteristics of the normal civil engineering structure 10.
In Method A, when the civil engineering structure 10 deteriorates, the frequency at which the peak occurs shifts to the high frequency side, but the relationship between the deterioration and the frequency shift direction is only an example, and is not limited to this. Since the pattern of the civil engineering structure 10 is determined by the state, material, and the like peculiar to the civil engineering structure 10, when the civil engineering structure 10 deteriorates, the frequency at which the peak occurs may shift to the low frequency side.
[0033]
Further, the peak used in the method A appears, for example, in the vibration generated when the train or the automobile passes through the civil engineering structure 10, and immediately before or immediately after the train or the automobile passes through the civil engineering structure 10. It also appears in the generated vibration.
[0034]
(B) Method B
Subsequently, a method B for detecting the deteriorated state of the civil engineering structure 10 will be described with reference to FIGS. 5 and 6. 5 and 6 show vibration data (horizontal axis is time, vertical axis is intensity (amplitude)) of the civil engineering structure 10. Further, FIG. 5 shows the vibration data of the normal civil engineering structure 10, and FIG. 6 shows the vibration data of the deteriorated civil engineering structure 10.
[0035]
In the present method B, the worker generates vibration in the civil engineering structure 10 by means such as hitting the civil engineering structure 10 with a hammer, and the vibration is used.
Similar to the method A described above, the detection unit 332 detects the pattern according to the deterioration state of the civil engineering structure 10 based on the processing result by the fiber sensing unit 331. Specifically, in the present method B, the frequency characteristics of the civil engineering structure 10 as shown in FIGS. 5 and 6 are detected.
[0036]
As shown in FIGS. 5 and 6, the vibration generated in the civil engineering structure 10 is subsequently damped. This decay time becomes a dynamic fluctuation pattern that varies depending on the deterioration state of the civil engineering structure 10. Specifically, as shown in FIG. 5, in the case of the normal civil engineering structure 10, the damping time of the vibration is short. On the other hand, as shown in FIG. 6, in the case of the deteriorated civil engineering structure 10, the damping time of the vibration is long.
[0037]
Therefore, when detecting the deteriorated state of the civil engineering structure 10, the detection unit 332 first detects the vibration data (for example, FIGS. 5 and 6) of the civil engineering structure 10. Subsequently, the detection unit 332 detects the deterioration state of the civil engineering structure 10 based on the decay time of the vibration generated in the civil engineering structure 10 in the vibration data of the civil engineering structure 10. Further, the detection unit 332 may detect the deterioration level based on the magnitude of the attenuation time.
In Method B, when the civil engineering structure 10 deteriorates, the vibration damping time becomes long, but the relationship between the deterioration and the vibration damping time is only an example, and is not limited to this. Since the pattern of the civil engineering structure 10 is determined by the state, material, and the like peculiar to the civil engineering structure 10, when the civil engineering structure 10 deteriorates, the damping time of vibration may be shortened.
Further, in the present method B, the worker artificially uses the vibration generated in the civil engineering structure 10, but the present invention is not limited to this. For example, vibration is generated when a train or an automobile passes through the civil engineering structure 10, and the vibration may be used. Further, the vibration generated immediately before or immediately after the train or the automobile passes through the civil engineering structure 10 may be used.
[0038]
(C) Method C
Subsequently, a method C for detecting the deteriorated state of the civil engineering structure 10 will be described with reference to FIGS. 7 and 8. FIG. 7 shows the monitor points of the civil engineering structure 10 used in the present method C. In FIG. 7, the detection unit 332 is not shown. Further, each figure included in FIG. 8 shows the frequency characteristics of the civil engineering structure 10 similar to those in FIGS. 3 and 4.
[0039]
In general, the civil engineering structure 10 does not vibrate uniformly at each position.
Therefore, the vibration that can be acquired differs depending on the monitor point that monitors the civil engineering structure 10, and the characteristics of the vibration also differ.
Therefore, by devising the method of laying the optical fiber cable 20 on the civil engineering structure 10, it is possible to increase the vibration of various monitor points of the civil engineering structure 10.
Therefore, in the present method C, vibrations are acquired at a plurality of monitor points (two monitor points # 1 and # 2 in FIG. 7) for one civil engineering structure 10, and the characteristics of the plurality of vibrations are combined. , To improve the accuracy of deterioration detection of the civil engineering structure 10.
[0040]
When the detection unit 332 detects the deterioration state of the civil engineering structure 10, the deterioration state at each of the two monitor points # 1 and # 2 is based on the processing result by the fiber sensing unit 331, as in the method A described above. Detects the pattern according to. Specifically, in the present method C, the same frequency characteristics as those in FIGS. 3 and 4 are detected. Further, the detection unit 332 periodically detects the pattern according to the deterioration state at each of the two monitor points # 1 and # 2.
[0041]
Then, the detection unit 332 detects the deterioration state of the civil engineering structure 10 based on the frequency at which the peak occurs in the frequency characteristics of each of the time series of the two monitor points # 1 and # 2. Specifically, in the detection unit 332, when the frequency at which the intensity peak occurs is shifted to the low frequency side in the frequency characteristics of both the two monitor points # 1 and # 2, the civil engineering structure 10 deteriorates. Is detected. Further, the detection unit 332 may detect the deterioration level of the civil engineering structure 10 based on the magnitude of the shift amount.
In method C, when the civil engineering structure 10 deteriorates, the frequency at which the peak occurs shifts to the low frequency side, but as explained in method A, the relationship between the deterioration and the frequency shift direction is just an example. And is not limited to this.
[0042]
Subsequently, with reference to FIGS. 9 to 11, a method of laying the optical fiber cable 20 on the civil engineering structure 10 in the present method C will be described. In FIGS. 9 to 11, the detection unit 332 is not shown.
In the example of FIG. 9, the optical fiber cable 20 is laid linearly with respect to the civil engineering structure 10. In this case, the civil engineering structure 10 can be captured by a line and the vibration state can be monitored.
In the example of FIG. 10, the optical fiber cable 20 is laid in a zigzag manner on the specific surface so as to cover the specific surface parallel to the axial direction of the optical fiber cable 20 in the civil engineering structure 10. In this case, it is possible to monitor the vibration state of the entire specific surface of the civil engineering structure 10.
In the example of FIG. 11, in addition to the specific surface in the civil engineering structure 10 of FIG. 10, the second specific surface orthogonal to the axial direction of the optical fiber cable 20 in the civil engineering structure 10 is also covered. As described above, the optical fiber cable 20 is laid in a zigzag manner on the specific surface and the second specific surface. In this case, it is possible to monitor the vibration state of the entire civil engineering structure 10 (in the three-axis direction).
In this way, especially in the examples of FIGS. 10 and 11, it is possible to increase the number of monitor points that can acquire the vibration of the civil engineering structure 10.
[0043]
Further, when the civil engineering structure 10 is in a state of violent shaking, excessive vibration is monitored, and it becomes impossible to monitor the vibration state with an appropriate strength.
In that case, as shown in FIG. 12, a cushioning material such as a cushion 60 may be installed between the optical fiber cable 20 and the civil engineering structure 10. As a result, the vibration transmitted from the civil engineering structure 10 is softened, so that the vibration state can be monitored with an appropriate strength.
[0044]
(D) Method D
Next, a method D for detecting the deteriorated state of the civil engineering structure 10 will be described.
In the present method D, the detection unit 332 detects the deteriorated state of the civil engineering structure 10 by using the corresponding table.
[0045]
The detection unit 332 holds a correspondence table in which the pattern corresponding to the deterioration state of the civil engineering structure 10 and the deterioration state of the civil engineering structure 10 are associated with each other. The pattern according to the deterioration state is, for example, the frequency characteristics of the vibration data as shown in FIGS. 3 and 4 described by the above-mentioned method A, and the patterns in FIGS. 5 and 6 described by the above-mentioned method B. The vibration data is as shown in.
When the detection unit 332 detects the deteriorated state of the civil engineering structure 10, first, the detection unit 332 detects the pattern corresponding to the deteriorated state of the civil engineering structure 10. Subsequently, the detection unit 332 uses the above-mentioned correspondence table to specify the deterioration state of the civil engineering structure 10 corresponding to the pattern corresponding to the deterioration state of the civil engineering structure 10.
[0046]
(E) Method E
Next, a method E for detecting the deteriorated state of the civil engineering structure 10 will be described.
In the method E, the detection unit 332 machine-learns (for example, deep learning) a pattern according to the deterioration state of the civil engineering structure 10, and uses the learning result (initial learning model) of the machine learning to perform the civil engineering structure. 10 deterioration states are detected.
[0047]
First, the machine learning method in the present method E will be described with reference to FIG. Here, a method of learning the patterns of three civil engineering structures 10 (referred to as civil engineering structures 10A, 10B, 10C) as teacher data will be described.
As shown in FIG. 13, the detection unit 332 includes teacher data which is deterioration level information indicating the degree of deterioration of the civil engineering structures 10A, 10B, and 10C, and a pattern according to the deterioration state of the civil engineering structures 10A, 10B, and 10C. And are input (steps S1 and S2). FIG. 14 shows an example of deterioration level information that serves as teacher data. In addition, in FIG. 14, the deterioration level indicates that the larger the numerical value is, the more the deterioration is progressing. Further, the deterioration level information is held by the detection unit 332. Further, the pattern according to the deterioration state is, for example, the frequency characteristics of the vibration data as shown in FIGS. 3 and 4 described in the above-mentioned method A, and the patterns in FIG. 5 and described in the above-mentioned method B. The vibration data is as shown in FIG.
[0048]
Subsequently, the detection unit 332 matches and classifies the two (step S3), and performs supervised learning (step S4). As a result, an initial learning model is obtained (step S5). This initial learning model is a model in which when a pattern generated in the civil engineering structure 10 is input, the deterioration state of the civil engineering structure 10 is output.
[0049]
Subsequently, a method for detecting the deteriorated state of the civil engineering structure 10 in the present method E will be described.
When detecting the deterioration state of the civil engineering structure 10, the detection unit 332 first detects a pattern corresponding to the deterioration state of the civil engineering structure 10, and then inputs the detected pattern into the initial learning model. As a result, the detection unit 332 obtains the deteriorated state of the civil engineering structure 10 as the output result of the initial learning model.
[0050]
As described above, in the present method E, the pattern corresponding to the deterioration state of the civil engineering structure 10 is machine-learned, and the deterioration state of the civil engineering structure 10 is detected by using the learning result of the machine learning.
It may be difficult for human analysis to extract features for detecting the deterioration state of the civil engineering structure 10 from the data. In the method E, by constructing a learning model from a large number of patterns, it is possible to detect the deteriorated state of the civil engineering structure 10 with high accuracy even when it is difficult to analyze by humans.
[0051]
In the machine learning in the method E, in the initial state, a learning model may be generated based on two or more teacher data. Further, the learning model may be newly trained with the newly detected pattern. At that time, the detailed conditions for detecting the deterioration state of the civil engineering structure 10 may be adjusted from the new learning model.
[0052]
Subsequently, with reference to FIG. 15, the hardware configuration of the computer 40 that realizes the civil engineering structure monitoring device 33 will be described below.
As shown in FIG. 15, the computer 40 includes a processor 401, a memory 402, a storage 403, an input / output interface (input / output I / F) 404, a communication interface (communication I / F) 405, and the like. The processor 401, the memory 402, the storage 403, the input / output interface 404, and the communication interface 405 are connected by a data transmission line for transmitting and receiving data to and from each other.
[0053]
The processor 401 is, for example, an arithmetic processing unit such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The memory 402 is, for example, a memory such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The storage 403 is a storage device such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a memory card. Further, the storage 403 may be a memory such as a RAM or a ROM.
[0054]
The storage 403 stores a program that realizes the functions of the fiber sensing unit 331 and the detection unit 332 included in the civil engineering structure monitoring device 33. The processor 401 realizes the functions of the fiber sensing unit 331 and the detection unit 332, respectively, by executing each of these programs. Here, when executing each of the above programs, the processor 401 may read these programs onto the memory 402 and then execute the programs, or may execute the programs without reading them onto the memory 402. Further, the memory 402 and the storage 403 also play a role of storing information and data held by the fiber sensing unit 331 and the detection unit 332.
[0055]
Further, the above-mentioned program can be stored by using various types of non-transitory computer readable medium and supplied to a computer (including a computer 40). Non-temporary computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), optomagnetic recording media (eg, optomagnetic disks), CD-ROMs (Compact Disc-Read Only Memory). , CD-R (CD-Recordable), CD-R / W (CD-ReWritable), semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory) )including. The program may also be supplied to the computer by various types of transient computer readable medium. Examples of temporary computer readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
[0056]
The input / output interface 404 is connected to a display device 4041, an input device 4042, and the like. The display device 4041 is a device such as an LCD (Liquid Crystal Display) or a CRT (Cathode Ray Tube) display that displays a screen corresponding to drawing data processed by the processor 401. The input device 4042 is a device that receives an operator's operation input, and is, for example, a keyboard, a mouse, a touch sensor, and the like. The display device 4041 and the input device 4042 may be integrated and realized as a touch panel. The computer 40 may also include a distributed acoustic sensor, a distributed vibration sensor, a sensor (not shown) including a distributed temperature sensor, and the like, and the sensor may be connected to the input / output interface 404.
[0057]
The communication interface 405 sends and receives data to and from an external device. For example, the communication interface 405 communicates with an external device via a wired communication path or a wireless communication path.
[0058]

Hereinafter, the operation of the civil engineering structure monitoring system according to the present embodiment will be described. Here, with reference to FIG. 16, the operation flow of the civil engineering structure monitoring system according to the present embodiment will be described.
[0059]
As shown in FIG. 16, first, the fiber sensing unit 331 incidents pulsed light on at least one communication optical fiber included in the optical fiber cable 20 (step S11).
Subsequently, the fiber sensing unit 331 receives backscattered light including a pattern according to the deterioration state of the civil engineering structure 10 from the same communication optical fiber as the communication optical fiber incident with the pulsed light (step S12).
[0060]
Subsequently, the fiber sensing unit 331 identifies the civil engineering structure 10 that generated the backscattered light received in step S12 (step S13). At this time, the fiber sensing unit 331 may specify the civil engineering structure 10 that generated the backscattered light by using the method based on the time difference described above.
[0061]
After that, the detection unit 332 detects the deteriorated state of the civil engineering structure 10 specified in step S13 based on the pattern included in the backscattered light received in step S12 (step S14). At this time, the detection unit 332 may detect the deteriorated state of the civil engineering structure 10 by using any of the methods A to E described above.
[0062]
Note that, in FIG. 16, in step S12, the processes of steps S13 and S14 may be performed each time the backscattered light including the pattern corresponding to the deterioration state of the civil engineering structure 10 is received. Alternatively, in step S12, after a plurality of backscattered lights including a pattern corresponding to the deterioration state of the civil engineering structure 10 are received, the processes of steps S13 and S14 may be performed for each backscattered light.
[0063]

As described above, according to the present embodiment, backscattered light (optical signal) including a pattern according to the deterioration state of the civil engineering structure 10 is received from at least one communication optical fiber included in the optical fiber cable 20. Then, the deterioration state of the civil engineering structure 10 is detected based on the pattern included in the received backscattered light. As described above, according to the present embodiment, for example, the civil engineering structure 10 is subjected to dynamic pattern analysis of changes in vibration generated in the civil engineering structure 10 (for example, changes in vibration intensity). Detects the deterioration state of. Therefore, the deteriorated state of the civil engineering structure 10 can be detected with high accuracy.
[0064]
Further, according to the present embodiment, in order to detect the deterioration state of the civil engineering structure 10, an existing optical fiber for communication may be used, and the optical fiber contains quantum dots as in Patent Document 1. It is not necessary to drive a lock bolt into the underground space of the civil engineering structure 10 as in Patent Document 2. Therefore, since a dedicated structure for detecting the deteriorated state of the civil engineering structure 10 is not required, the civil engineering structure monitoring system can be constructed at low cost.
[0065]
Further, according to the present embodiment, the deteriorated state of a plurality of civil engineering structures 10 can be detected simultaneously and remotely by using the existing optical fiber for communication, so that the deteriorated state of the civil engineering structure 10 can be grasped. In addition to being easy, the cost for grasping the deteriorated state of the civil engineering structure 10 can be reduced.
[0066]
Further, according to the present embodiment, an optical fiber sensing technology using an optical fiber as a sensor is used. Therefore, there are advantages such as being unaffected by electromagnetic noise, eliminating the need for power supply to the sensor, being excellent in environmental resistance, and facilitating maintenance.
[0067]

As described above, the fiber sensing unit 331 emits backward scattered light including a pattern according to the deterioration state of the civil engineering structure 10 from the same communication optical fiber at the time when the pulsed light is incident on the communication optical fiber. Based on the time difference between the received time and the time, it is possible to calculate the generation position where the backward scattered light is generated. Therefore, the fiber sensing unit 331 may not only specify the civil engineering structure 10 in which the backscattered light is generated, but also specify the deterioration position of the civil engineering structure 10 based on the calculation result.
[0068]
Further, the detection unit 332 is determined to hold the deteriorated state of the civil engineering structure 10 detected above for each civil engineering structure 10, and periodically (for example, every year), the deteriorated state of the civil engineering structure 10 is maintained. By detecting, the state change of the deterioration state of the civil engineering structure 10 with time may be detected.
[0069]
Further, the detection unit 332 may detect a sign of deterioration or breakage of the civil engineering structure 10 based on a change of state of the civil engineering structure 10 over time.
Here, with reference to FIG. 17, a method of detecting a sign of deterioration or breakage of the civil engineering structure 10 in the detection unit 332 will be described. FIG. 17 shows the frequency characteristics of the vibration data of the civil engineering structure 10 similar to those in FIGS. 3 and 4 in chronological order.
As shown in FIG. 17, the detection unit 332 predicts the frequency characteristics one year later based on the changes over time in the frequency characteristics of the vibration data of the current civil engineering structure 10 three years ago, two years ago. Then, based on the predicted frequency characteristics after one year, deterioration or damage of the civil engineering structure 10 after one year is predicted. Here, the detection unit 332 predicts that the civil engineering structure 10 will reach the deterioration level 3 after one year based on the frequency at which the peak occurs in the frequency characteristics after one year.
[0070]
Further, the fiber sensing unit 331 further adds information on each civil engineering structure to the civil engineering structure information held by itself, and the detection unit 332 also uses the additional information added to the civil engineering structure information to form the civil engineering structure. The deterioration state of the object 10 may be detected. FIG. 18 shows another example of civil engineering structure information. As for the civil engineering structure information shown in FIG. 18, information on the material, length, and construction year (or installation year) of each civil engineering structure 10 is added as compared with FIG. Therefore, the detection unit 332 takes into consideration the material, length, and information of the construction year of the civil engineering structure 10 in addition to the pattern according to the deterioration state of the civil engineering structure 10 contained in the backward scattered light, and the civil engineering thereof. The deterioration state of the structure 10 may be detected. As a result, the detection accuracy can be improved.
[0071]
Further, after the civil engineering structure 10 detected to be deteriorated by the detection unit 332 is replaced with a new one, the analyst actually disassembles the old civil engineering structure 10 to determine the actual deterioration level. Is also good. At this time, if there is a difference between the deterioration level detected by the detection unit 332 and the deterioration level determined by the analyst, the difference may be fed back to the detection unit 332. In this case, since the detection unit 332 subsequently detects the deterioration state of the civil engineering structure 10 so as to approach the actual deterioration level, the detection accuracy can be improved.
[0072]
Further, when the detection unit 332 machine-learns the pattern according to the deterioration state of the civil engineering structure 10 by the above method E, it is considered that the deterioration state of the civil engineering structure 10 differs depending on the region. For example, it is considered that the deterioration state differs between warm regions and cold regions. Therefore, the detection unit 332 may perform machine learning for each region by using the teacher data corresponding to the region.
[0073]
Further, in the above-described embodiment, it is assumed that the existing optical fiber cable 20 is used, but as shown in FIG. 19, the optical fiber cable 20 is newly installed, and the data collection unit 34 is attached to the newly installed optical fiber cable 20. May be connected. The data collection unit 34 also collects data of patterns (for example, sound, temperature, vibration, etc.) of the civil engineering structures 10A and 10B, and transmits the collected data to the detection unit 332. At this time, the data may be transmitted from the data collection unit 34 to the detection unit 332 via the optical fiber cable 20 or via a separately provided radio. The detection unit 332 detects the deterioration state of the civil engineering structures 10A and 10B based on the data collected by the data collection unit 34 and the fiber sensing unit 331. Therefore, the detection accuracy can be improved.
[0074]
Further, as shown in FIG. 20, a management system 50 for managing the civil engineering structure 10 may be provided based on the detection result by the civil engineering structure monitoring device 33. Even if the management system 50 presents the system administrator or the like with a deterioration state of the civil engineering structure 10, a change in the deterioration state of the civil engineering structure 10 over time, a sign of deterioration or damage of the civil engineering structure 10, and the like. good. Further, the management system 50 may calculate the repair time of the civil engineering structure 10 based on the detection result by the civil engineering structure monitoring device 33 and present the repair time of the civil engineering structure 10 to the system administrator or the like. good. Further, although the management system 50 is provided outside the communication carrier station building 30, it may be provided inside the communication carrier station building 30. Further, when the management system 50 is provided outside the communication carrier station building 30, the civil engineering structures 10 connected to each of the plurality of communication carrier station buildings 30 by the optical fiber cable 20 are centrally provided by one management system 50. You may monitor it.
[0075]
Further, the fiber sensing unit 331 and the detection unit 332 of the civil engineering structure monitoring device 33 may be provided separately from each other. For example, only the fiber sensing unit 331 may be provided inside the communication carrier station building 30, and the civil engineering structure monitoring device 33 including the detection unit 332 may be provided outside the communication carrier station building 30.
[0076]
Further, in the above-described embodiment, only one fiber sensing unit 331 is provided and occupies the optical fiber cable 20, but the present invention is not limited to this. Here, with reference to FIGS. 21 to 24, the arrangement of the fiber sensing unit 331 in the civil engineering structure monitoring system according to another embodiment will be described. In addition, in FIGS. 21 to 24, the illustration of the detection unit 332 is omitted.
[0077]
In the example of FIG. 21, the fiber sensing unit 331 shares the optical fiber cable 20 with the existing communication equipment 31. Further, in order to share the optical fiber cable 20 between the fiber sensing unit 331 and the existing communication equipment 31, a filter 32 for signal separation is provided.
[0078]
In the example of FIG. 22, one fiber sensing unit 331 is provided for each of the plurality of communication carrier station buildings 30 (two communication carrier station buildings 30A and 30Z in FIG. 22). Specifically, fiber sensing units 331A and 331Z are provided inside the communication carrier station buildings 30A and 30Z, respectively. In the example of FIG. 22, the civil engineering structures 10A and 10B are connected to the communication carrier station building 30A by the optical fiber cable 20, and the civil engineering structures 10C and 10D are connected to the communication carrier station building 30Z by the optical fiber cable 20. The civil engineering structures 10B and 10D are connected by an optical fiber cable 20. The communication equipments 31A and 31Z correspond to the communication equipment 31, and the filters 32A and 32Z correspond to the filter 32.
In the example of FIG. 22, the fiber sensing units 331A and 331Z both monitor the civil engineering structures 10A to 10D.
[0079]
In the example of FIG. 23, the data collection unit 34 is provided in the vicinity of the civil engineering structure 10B as compared with FIG. 22. Here, only one data collecting unit 34 is provided for each of the four civil engineering structures 10A to 10D, but the data collecting unit 34 has a predetermined number of civil engineering structures 10 (for example, 10 civil engineering structures). One may be provided for the structure 10), and one or more may be provided. For example, when the optical fiber cable 20 is laid in 100 civil engineering structures 10, one data collecting unit 34 is provided for every 10 civil engineering structures 10, and a total of 10 data collecting units 34 are provided. It should be provided.
[0080] [0080]
In the example of FIG. 23, each data collection unit 34 collects data of a corresponding predetermined number of patterns (for example, sound, temperature, vibration, etc.) of the civil engineering structure 10, and the detection unit 332 collects data of each data collection unit 34. Aggregates the data collected by. At this time, the data may be transmitted from each data collection unit 34 to the detection unit 332 via the optical fiber cable 20 or via a separately provided radio. The detection unit 332 detects the deterioration state of the civil engineering structure 10 for which the data collection unit 34 has collected data based on the data.
[0081]
Therefore, the monitor section of one fiber sensing unit 331 is shortened, and the number of civil engineering structures 10 to be monitored is reduced. Since the monitor section of the fiber sensing unit 331 is short, the transmission distance of the pulsed light and the backscattered light is short, so that the fiber loss is small. As a result, the S / N ratio (signal-to-noise ratio) of the received backscattered light is improved, and the monitor accuracy can be improved. Further, by reducing the number of civil engineering structures 10 to be monitored by the fiber sensing unit 331, it is possible to improve the monitoring cycle.
[0082]
In the example of FIG. 24, a plurality of fiber sensing units 331 (two fiber sensing units 331A and 331Z in FIG. 24) are provided in one communication carrier station building 30AZ. In the example of FIG. 24, the civil engineering structures 10A and 10B are connected to the fiber sensing unit 331A by the optical fiber cable 20, and the civil engineering structures 10C and 10D are connected to the fiber sensing unit 331Z by the optical fiber cable 20. The civil engineering structures 10B and 10D are connected by the optical fiber cable 20. The communication equipments 31A and 31Z correspond to the communication equipment 31, and the filters 32A and 32Z correspond to the filter 32.
[0083]
In the example of FIG. 24, the fiber sensing units 331A and 331Z both monitor the civil engineering structures 10A to 10D. However, the fiber sensing unit 331A injects pulsed light in the clockwise direction to monitor the civil engineering structures 10A to 10D, and the fiber sensing unit 331Z injects the pulsed light in the counterclockwise direction to inject civil engineering. Monitor structures 10A-10D.
[0084]
When a plurality of fiber sensing units 331 are provided as shown in FIGS. 22 to 24, one civil engineering structure monitoring device 33 including the detection unit 332 may be provided for the plurality of fiber sensing units 331. Then, the deterioration state of the civil engineering structure 10 connected to each of the plurality of fiber sensing units 331 by the optical fiber cable 20 may be intensively detected by one civil engineering structure monitoring device 33. In this case, the civil engineering structure monitoring device 33 may be provided inside any one of the communication carrier station building 30, or may be provided outside the communication carrier station building 30.
[0085]
Further, the optical fiber cable 20 laid in the civil engineering structure 10 may be disconnected. Therefore, with reference to FIGS. 25 to 27, the operation of the fiber sensing unit 331 when the optical fiber cable 20 is disconnected in the civil engineering structure monitoring system according to another embodiment will be described. In addition, in FIGS. 25 to 27, the detection unit 33 The illustration of 2 is omitted.
[0086]
The example of FIG. 25 is an example in which the optical fiber cable 20 between the civil engineering structure 10A and the civil engineering structure 10B is disconnected in the configuration of FIG. 21. The fiber sensing unit 331 continues to inject pulsed light into the optical fiber cable 20 even if the optical fiber cable 20 is disconnected. As a result, the communication carrier station building 30 can continuously monitor in the section up to the disconnected position.
[0087]
The example of FIG. 26 is an example in which the optical fiber cable 20 between the civil engineering structure 10A and the civil engineering structure 10B is disconnected in the configuration of FIG. 22. The fiber sensing units 331A and 331Z continue to inject pulsed light into the optical fiber cable 20 even if the optical fiber cable 20 is disconnected. At this time, the civil engineering structure 10 is always connected to two or more communication carrier station buildings 30 (two communication carrier station buildings 30A and 30Z in FIG. 26). Therefore, by monitoring the communication carrier stations 30A and 30Z from both directions, it is possible to construct a redundant configuration in which the entire section can be continuously monitored in the event of a single failure.
[0088]
The example of FIG. 27 is an example in which the optical fiber cable 20 between the civil engineering structure 10A and the civil engineering structure 10B is disconnected in the configuration of FIG. 24. The fiber sensing units 331A and 331Z continue to inject pulsed light into the optical fiber cable 20 even if the optical fiber cable 20 is disconnected. At this time, in the example of FIG. 27, a ring configuration is constructed in which the optical fiber cables 20 are connected in a ring shape. Therefore, by monitoring the ring from one communication carrier station building 30AZ in both directions, it is possible to construct a redundant configuration capable of continuously monitoring the entire section in the event of a single failure.
[0089]
Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present disclosure within the scope of the present disclosure.
[0090]
Further, a part or all of the above embodiments may be described as in the following appendix, but the present invention is not limited to the following.
(Appendix 1)
Cables including optical fibers for communication laid in civil engineering structures,
A receiving unit that receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable.
Based on the pattern, the detection unit that detects the deterioration state of the civil engineering structure,
Civil engineering structure monitoring system equipped with.
(Appendix 2)
The receiver is
Based on the optical signal, the civil engineering structure in which the optical signal was generated was identified.
The detection unit is
Detecting the deteriorated state of the specified civil engineering structure based on the pattern.
Civil engineering structure monitoring system described in Appendix 1.
(Appendix 3)
The receiver is
Identify the deterioration position of the civil engineering structure based on the optical signal,
Civil engineering structure monitoring system described in Appendix 2.
(Appendix 4)
The detection unit is
By periodically detecting the deteriorated state of the civil engineering structure, the change of state of the deteriorated state of the civil engineering structure over time is detected.
The civil engineering structure monitoring system described in any one of the appendices 1 to 3.
(Appendix 5)
The detection unit is
Detecting signs of deterioration or damage to the civil engineering structure based on changes in the state of deterioration of the civil engineering structure over time.
Civil engineering structure monitoring system described in Appendix 3.
(Appendix 6)
A receiving unit that receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure.
Based on the pattern, the detection unit that detects the deterioration state of the civil engineering structure,
Civil engineering structure monitoring device equipped with.
(Appendix 7)
The receiver is
Based on the optical signal, the civil engineering structure in which the optical signal was generated was identified.
The detection unit is
Detecting the deteriorated state of the specified civil engineering structure based on the pattern.
Civil engineering structure monitoring device described in Appendix 6.
(Appendix 8)
The receiver is
Identify the deterioration position of the civil engineering structure based on the optical signal,
Civil engineering structure monitoring device described in Appendix 7.
(Appendix 9)
The detection unit is
By periodically detecting the deteriorated state of the civil engineering structure, the change of state of the deteriorated state of the civil engineering structure over time is detected.
The civil engineering structure monitoring device according to any one of Appendix 6 to 8.
(Appendix 10)
The detection unit is
Detecting signs of deterioration or damage to the civil engineering structure based on changes in the state of deterioration of the civil engineering structure over time.
Civil engineering structure monitoring device described in Appendix 9.
(Appendix 11)
It is a civil engineering structure monitoring method using a civil engineering structure monitoring device.
Receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure.
Detecting the deterioration state of the civil engineering structure based on the pattern,
Civil engineering structure monitoring method.
(Appendix 12)
On the computer
A procedure for receiving an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure, and
Based on the pattern, the procedure for detecting the deterioration state of the civil engineering structure and
A non-temporary computer-readable medium that stores a program for executing.
[0091]
This application claims priority on the basis of Japanese application Japanese Patent Application No. 2018-21915 filed on November 12, 2018, and incorporates all of its disclosures herein.
Description of the sign
[0092]
10,10A-10D civil engineering structures
20 Optical fiber cable
30, 30A, 30Z, 30AZ Communication carrier station building
31, 31A, 31Z communication equipment
32, 32A, 32Z filter
33 Civil engineering structure monitoring device
331, 331A, 331Z Fiber sensing unit
332 detection unit
34 Data collection department
40 computer
401 processor
402 Memory
403 storage
404 I / O interface
4041 Display device
4042 input device
405 communication interface
50 management system
The scope of the claims
[Claim 1]
Cables including optical fibers for communication laid in civil engineering structures,
A receiving unit that receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable.
Based on the pattern, the detection unit that detects the deterioration state of the civil engineering structure,
Civil engineering structure monitoring system equipped with.
[Claim 2]
The receiver is
Based on the optical signal, the civil engineering structure in which the optical signal was generated was identified.
The detection unit is
Detecting the deteriorated state of the specified civil engineering structure based on the pattern.
The civil engineering structure monitoring system according to claim 1.
[Claim 3]
The receiver is
Identify the deterioration position of the civil engineering structure based on the optical signal,
The civil engineering structure monitoring system according to claim 2.
[Claim 4]
The detection unit is
By periodically detecting the deteriorated state of the civil engineering structure, the change of state of the deteriorated state of the civil engineering structure over time is detected.
The civil engineering structure monitoring system according to any one of claims 1 to 3.
[Claim 5]
The detection unit is
Detecting signs of deterioration or damage to the civil engineering structure based on changes in the state of deterioration of the civil engineering structure over time.
The civil engineering structure monitoring system according to claim 3.
[Claim 6]
A receiving unit that receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure.
Based on the pattern, the detection unit that detects the deterioration state of the civil engineering structure,
Civil engineering structure monitoring device equipped with.
[Claim 7]
The receiver is
Based on the optical signal, the civil engineering structure in which the optical signal was generated was identified.
The detection unit is
Detecting the deteriorated state of the specified civil engineering structure based on the pattern.
The civil engineering structure monitoring device according to claim 6.
[Claim 8]
The receiver is
Identify the deterioration position of the civil engineering structure based on the optical signal,
The civil engineering structure monitoring device according to claim 7.
[Claim 9]
The detection unit is
By periodically detecting the deteriorated state of the civil engineering structure, the change of state of the deteriorated state of the civil engineering structure over time is detected.
The civil engineering structure monitoring device according to any one of claims 6 to 8.
[Claim 10]
The detection unit is
Detecting signs of deterioration or damage to the civil engineering structure based on changes in the state of deterioration of the civil engineering structure over time.
The civil engineering structure monitoring device according to claim 9.
[Claim 11]
It is a civil engineering structure monitoring method using a civil engineering structure monitoring device.
Receives an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure.
Detecting the deterioration state of the civil engineering structure based on the pattern,
Civil engineering structure monitoring method.
[Claim 12]
On the computer
A procedure for receiving an optical signal including a pattern according to the deterioration state of the civil engineering structure from at least one communication optical fiber included in the cable laid in the civil engineering structure, and
Based on the pattern, the procedure for detecting the deterioration state of the civil engineering structure and
A non-temporary computer-readable medium that stores a program for executing.