JP7355703B2 - Monitoring equipment and health monitoring system - Google Patents

Description

The present invention relates to a monitoring device and a health monitoring system.

In general, in bridges that span rivers, etc., the stability and soundness of the piers may deteriorate due to local scouring, lowering of the riverbed, etc. Therefore, in recent years, a new method of evaluating the soundness of bridge piers by constantly measuring minute movements of bridge piers due to wind and water flow has been studied (for example, Patent Document 1).

In Patent Document 1, constant microtremors of a bridge pier are measured with an acceleration sensor, and a power spectrum area ratio correlated with the natural frequency of the bridge pier is calculated from the measured value of the constant microtremors. Then, the amount of overburden is estimated based on the power spectrum area ratio, and the soundness of the pier is evaluated.

JP 2017-3417 Publication

However, in Patent Document 1, the measurement data of the acceleration sensor includes the influence of environmental noise such as the water level of the river in which the bridge pier is provided. In particular, when the water level of a river rises due to an increase in water, etc., the influence of environmental noise increases, so there is a risk that the power spectrum area ratio that correlates with the natural frequency of the bridge pier cannot be accurately calculated. Therefore, there was a problem that the soundness of the bridge piers could not be properly evaluated.

The present invention provides a monitoring device and health monitoring device that can properly evaluate the soundness of at least one of a bridge pier, a foundation for a pier, and the ground of a foundation, even when the predominant frequency cannot be calculated with high accuracy during unsteady times such as when river water levels rise. The objective is to provide a monitoring system.

The monitoring device of the present invention is a monitoring device that is installed on a pier and measures the soundness of at least one of the pier, the foundation of the pier, and the ground of the foundation, and is configured to be able to constantly measure microtremors of the pier. A predominant frequency of the pier is calculated based on the measurement data of the permanent microtremor by the permanent microtremor measurement unit, the inclination angle measurement unit configured to be able to measure the inclination angle of the pier, and the continuous microtremor measurement unit. an analysis section; an input section configured to be able to input a switching signal; and a stop of the measurement of the continuous microtremor by the continuous microtremor measuring section based on the switching signal input to the input section; The present invention is characterized by comprising a measurement frequency changing unit that increases the frequency of measurement of the inclination angle by the angle measuring unit.

In the present invention, the measurement frequency changing section changes the measurement frequency of the continuous microtremor by the continuous microtremor measurement section and the measurement frequency of the inclination angle by the inclination angle measurement section, based on the switching signal inputted to the input section. Therefore, during steady state, the measurement frequency changing section increases the measurement frequency by the constant microtremor measuring section based on the input of the switching signal. This makes it possible to improve the accuracy of the soundness evaluation of the bridge pier based on the dominant frequency.
On the other hand, if rivers rise due to torrential rains, etc., scouring will progress rapidly, increasing the risk of bridges sinking or leaning. In this case, it is more effective to evaluate the soundness of the pier based on the inclination angle of the pier. Therefore, in an unsteady state such as when a river floods, the measurement frequency changing section increases the frequency at which the inclination angle measuring section measures the inclination angle based on the input of the switching signal. This makes it possible to improve the accuracy of evaluating the soundness of the pier based on the inclination angle. Therefore, even if the dominant frequency cannot be calculated with high accuracy during unsteady conditions such as when river water levels rise, the soundness of the bridge piers can be appropriately evaluated based on the inclination angle.

In the monitoring device of the present invention, it is preferable that the constant microtremor measuring section and the inclination angle measuring section are constituted by an acceleration sensor.
In this configuration, the constant microtremor measuring section and the inclination angle measuring section are composed of acceleration sensors, so that the configuration of the monitoring device can be simplified.

In the monitoring device of the present invention, it is preferable that the switching signal is input to the input unit when the water level of the river in which the bridge pier is provided exceeds a predetermined threshold.
In this configuration, when the water level of the river on which the bridge pier is installed exceeds a predetermined threshold, a switching signal is input to the input section, so the measurement frequency change section can change the constant microtremor measurement section and The measurement frequency of the tilt angle measurement unit can be changed.

In the monitoring device of the present invention, it is preferable that the switching signal is input from outside.
In this configuration, the switching signal is input from outside the monitoring device 100, so the configuration of the monitoring device is simplified compared to a configuration in which the switching signal is output by determining the increase in river water etc. inside the monitoring device. can.

In the monitoring device of the present invention, a storage section configured to be able to store measurement data of the inclination angle by the inclination angle measuring section and the predominant frequency calculated by the analysis section; It is preferable to include an output section configured to be able to output the measurement data of the inclination angle and the predominant frequency.
In this configuration, the output section appropriately outputs the dominant frequency stored in the storage section to the outside. That is, since the monitoring device outputs the predominant frequency, which is the calculation result, instead of the raw data obtained by constantly measuring microtremors, the amount of data transmitted is reduced. Therefore, the time required for data transmission can be reduced.

In the monitoring device of the present invention, the output section outputs the dominant frequency when the switching signal is not input to the input section, and measures the tilt angle when the switching signal is input to the input section. Preferably, the data is output.
In this configuration, the output section outputs either the predominant frequency or the inclination angle, so the amount of data transmitted is reduced. Therefore, the time required for data transmission can be reduced.

The health monitoring system of the present invention is a health monitoring system that monitors the health of at least one of a pier, a foundation of the pier, and the ground of the foundation, and includes a monitoring device installed on the pier, and the monitoring device. and a switching signal output device configured to be able to output a switching signal to the monitoring device, the monitoring device being configured to be able to constantly measure microtremors of the bridge pier. Calculate the predominant frequency of the pier based on the measurement data of the constant microtremor by the constant microtremor measurement unit, the inclination angle measurement unit configured to be able to measure the inclination angle of the pier, and the continuous microtremor measurement unit. an input section configured to be able to input the switching signal outputted from the switching signal output device; and an input section configured to be able to input the switching signal outputted from the switching signal output device; a measurement frequency changing unit that stops measurement of microtremors and increases the frequency of measurement of the inclination angle by the inclination angle measurement unit; and the measurement data of the inclination angle by the inclination angle measurement unit, and the measurement data calculated by the analysis unit. and an output section configured to be able to output the measured data of the inclination angle and the predominant frequency stored in the storage section, The frequency evaluation device includes an acquisition unit that acquires the measurement data of the predominant frequency and the tilt angle output from the monitoring device, and a , an evaluation unit that evaluates the soundness of the bridge pier.
According to the present invention, effects similar to those described above can be obtained.

The health monitoring system of the present invention is a health monitoring system that monitors the health of at least one of a pier, a foundation of the pier, and the ground of the foundation, and includes a monitoring device installed on the pier, and the monitoring device. and a switching signal output device configured to be able to output a switching signal to the monitoring device, the monitoring device being configured to be able to constantly measure microtremors of the bridge pier. Calculate the predominant frequency of the pier based on the measurement data of the constant microtremor by the constant microtremor measurement unit, the inclination angle measurement unit configured to be able to measure the inclination angle of the pier, and the continuous microtremor measurement unit. an input section configured to be able to input the switching signal outputted from the switching signal output device; and an input section configured to be able to input the switching signal outputted from the switching signal output device; a measurement frequency changing unit that stops measurement of microtremors and increases the frequency of measurement of the inclination angle by the inclination angle measurement unit, the measurement data of the inclination angle by the inclination angle measurement unit, and the data calculated by the analysis unit. a storage section configured to be able to store the predominant frequency; and an output section configured to be able to output the measurement data of the inclination angle and the predominant frequency stored in the storage section; The evaluation device includes: an acquisition unit that acquires measurement data of the predominant frequency and the inclination angle output from the monitoring device; a learning unit that learns the predominant frequency and the soundness of the pier as training data; The bridge pier is characterized by comprising an evaluation section that evaluates the soundness of the bridge pier based on the measurement data of the dominant frequency and the inclination angle acquired by the acquisition section and the learning result by the learning section.
According to the present invention, effects similar to those described above can be obtained.
Further, in the present invention, the soundness evaluation device includes a learning section that learns the predominant frequency of the pier and the soundness of the pier as teacher data, the measurement data of the predominant frequency and the inclination angle, and the learning results by the learning section. and an evaluation section that evaluates the soundness of the pier based on the above. As a result, the accuracy of estimating the health level based on the predominant frequency can be improved, so the health level of the bridge pier can be evaluated more accurately.

The health monitoring system of the present invention is a health monitoring system that monitors the health of at least one of a pier, a foundation of the pier, and the ground of the foundation, and includes a monitoring device installed on the pier, and the monitoring device. and a switching signal output device configured to be able to output a switching signal to the monitoring device, the monitoring device being configured to be able to constantly measure microtremors of the bridge pier. Calculate the predominant frequency of the pier based on the measurement data of the constant microtremor by the constant microtremor measurement unit, the inclination angle measurement unit configured to be able to measure the inclination angle of the pier, and the continuous microtremor measurement unit. an input section configured to be able to input the switching signal outputted from the switching signal output device; and an input section configured to be able to input the switching signal outputted from the switching signal output device; a measurement frequency changing unit that stops measurement of microtremors and increases the frequency of measurement of the inclination angle by the inclination angle measurement unit, the measurement data of the inclination angle by the inclination angle measurement unit, and the data calculated by the analysis unit. a storage section configured to be able to store the predominant frequency; and an output section configured to be able to output the measurement data of the inclination angle and the predominant frequency stored in the storage section; The evaluation device includes: an acquisition unit that acquires measurement data of the dominant frequency and the inclination angle output from the monitoring device; a learning unit that learns the inclination angle and the soundness of the pier as teacher data; The bridge pier is characterized by comprising an evaluation section that evaluates the soundness of the bridge pier based on the measurement data of the dominant frequency and the inclination angle acquired by the acquisition section and the learning result by the learning section.
According to the present invention, effects similar to those described above can be obtained.

1 is a schematic diagram showing an outline of a health monitoring system according to a first embodiment of the present invention. FIG. 1 is a block diagram showing a schematic configuration of a monitoring device according to a first embodiment. FIG. 1 is a block diagram showing a schematic configuration of a soundness evaluation device according to a first embodiment. A flowchart explaining a health monitoring method. The figure which shows an example of a spectrum analysis result. The figure which shows an example of the monitoring result of a predominant frequency. The figure which shows an example of the monitoring result of an inclination angle. FIG. 2 is a schematic diagram showing an outline of a health monitoring system according to a second embodiment. FIG. 2 is a block diagram showing a schematic configuration of a monitoring device according to a second embodiment. FIG. 7 is a block diagram showing a schematic configuration of a soundness evaluation device according to a third embodiment. The figure which shows an example of the monitoring result of the inclination angle of a modification.

[First embodiment]
A first embodiment of the present invention will be described based on the drawings.
FIG. 1 is a schematic diagram showing a schematic configuration of a health monitoring system 1 according to the first embodiment.
As shown in FIG. 1, a health monitoring system 1 according to the present embodiment monitors the health of a bridge pier BP of a bridge B spanning a river R.
The bridge piers BP support the bridge girders BG, and the bridge girders BG are provided with roads and tracks for people and vehicles to pass through.

The health monitoring system 1 includes a monitoring device 100 installed on a pier BP and a health evaluation device 200.
The monitoring device 100 includes a measurement unit 110 and a solar panel 120. The measurement unit 110 is installed at an arbitrary position on the upper part of the pier BP in order to constantly measure minute movements of the pier BP. The solar panel 120 only needs to be installed at a position where it can receive sunlight, and is installed, for example, on a street light pole LP on a bridge girder BG.
The health evaluation device 200 includes a data processing device 210, an input device 220, and an output device 230.

[Monitoring device 100]
FIG. 2 is a block diagram showing a schematic configuration of the monitoring device 100.
As shown in FIG. 2, the measurement unit 110 includes an acceleration sensor 111, a control section 112, a storage section 113, a communication section 114, a storage battery 115, a backup battery 116, and a switching section 117. In this embodiment, these are unitized by being housed in one case. That is, the measurement unit 110 is a smart sensor in which each function is integrated.

The solar panel 120 receives sunlight and converts the energy of the received sunlight into electric power.
The storage battery 115 is a secondary battery that can store surplus power out of the power generated by the solar panel 120.
The backup battery 116 is, for example, a primary battery such as a button battery or a dry battery.
The switching unit 117 is selectively connected to a power source of any one of the solar panel 120, the storage battery 115, and the backup battery 116, and is also connected to the acceleration sensor 111, the control unit 112, the storage unit 113, and the communication unit 114. There is.
Note that FIG. 2 schematically shows power lines connecting each block. Further, a DC-DC converter (not shown) or the like is connected between the switching unit 117 and each power source of the solar panel 120, storage battery 115, and backup battery 116 for stabilizing the DC voltage.

In this embodiment, the solar panel 120, the storage battery 115, the backup battery 116, and the switching section 117 constitute a power supply section 130 for supplying power to the acceleration sensor 111, the control section 112, and the like.
For example, if the solar panel 120 is generating sufficient power, the switching unit 117 selects the solar panel 120 as the connection destination. Further, when power cannot be generated by the solar panel 120 such as at night, the switching unit 117 switches the connection destination to the storage battery 115. Further, when the power supply from the solar panel 120 and the storage battery 115 is insufficient for the power consumption of the acceleration sensor 111, the control unit 112, etc., the switching unit 117 switches the connection destination to the backup battery 116.
As such a switching unit 117, an electronic switch (diode switch) can be used that preferentially switches to the one with the supply capacity.

The acceleration sensor 111 measures the acceleration (vibration information) of constant microtremors in a direction perpendicular to the axial direction of the bridge girder BG (direction perpendicular to the bridge axis) at a predetermined frequency. Continuous microtremors are minute vibrations that constantly occur in the pier BP due to the influence of wind or water current, for example. The reason why microtremors are constantly measured in the direction perpendicular to the bridge axis is that they are more affected by scouring.
Further, the acceleration sensor 111 measures the inclination angle C of the bridge pier BP with respect to the direction perpendicular to the bridge axis at a predetermined frequency. That is, the acceleration sensor 111 is an example of a constant microtremor measuring section and an inclination angle measuring section of the present invention. In this embodiment, the constant microtremor measuring section and the inclination angle measuring section are constituted by one acceleration sensor 111.
As the acceleration sensor 111, a highly accurate three-axis accelerometer capable of detecting minute vibrations, such as a MEMS accelerometer, is used. By using a MEMS accelerometer, it can be driven at low cost and with low power consumption.
Note that the acceleration sensor 111 is not limited to a 3-axis accelerometer, and for example, a 1-axis accelerometer may be used.

The control unit 112 includes a CPU (Central Processing Unit), a memory, and the like, and executes processing by the CPU executing a program stored in the memory.
The control unit 112 includes an analysis unit 1121 and a measurement frequency change unit 1122.
The analysis unit 1121 calculates the dominant frequency N of the pier BP based on the measurement data of the acceleration sensor 111.
The measurement frequency changing unit 1122 receives a switching signal, which will be described later, via the communication unit 114, and sets the normal mode and the non-steady mode based on the switching signal. Then, the measurement frequency changing unit 1122 changes the measurement frequency of the continuous microtremor and the inclination angle C by the acceleration sensor 111, respectively, according to the set mode.
Note that details of the analysis section 1121 and the measurement frequency change section 1122 will be described later.

The storage unit 113 is composed of a nonvolatile memory such as a RAM (Random Access Memory) or an SD card, and cumulatively stores the dominant frequency N and the inclination angle C in association with the date and time of measurement. The storage unit 113 also stores a constant microtremor measurement interval t1, a first tilt angle measurement interval t21, and a second tilt angle measurement interval t22, which will be described later.
The communication unit 114 is a communication interface configured to be able to communicate with a communication unit 211 of the health evaluation device 200, which will be described later, via an Internet line or the like. The communication unit 114 outputs data including the dominant frequency N and the inclination angle C stored in the storage unit 113. That is, the communication section 114 is an example of an output section of the present invention.
The communication unit 114 also receives the switching signal output from the health evaluation device 200. That is, the communication section 114 is an example of an input section of the present invention.
Note that the communication unit 114 may be a wireless communication interface, a wired communication interface, or an interface that serves both wireless communication and wired communication.

[Soundness evaluation device 200]
FIG. 3 is a block diagram showing a schematic configuration of the health evaluation device 200.
As shown in FIG. 3, the health evaluation device 200 includes the data processing device 210, the input device 220, and the output device 230, as described above.
The data processing device 210 is composed of, for example, a server device installed in a management office or the like, and includes a communication section 211, a control section 212, and a database 213.

The communication unit 211 is a communication interface that inputs and outputs data and signals between the data processing device 210 and external devices. The communication unit 211 acquires data including the dominant frequency N and the inclination angle C from the monitoring device 100. That is, the communication unit 211 is an example of an acquisition unit of the present invention.
Furthermore, the communication unit 211 outputs a switching signal output from a switching signal output unit 2122, which will be described later, to the monitoring device 100. That is, in this embodiment, the health evaluation device 200 serves both as the health evaluation device and the switching signal output device of the present invention.
Note that the communication unit 211 may be a wireless communication interface, a wired communication interface, or an interface that serves both wireless communication and wired communication.

The control unit 212 includes a CPU, a memory, and the like, and the CPU executes each process by executing a program stored in the memory. The control section 212 includes an evaluation section 2121 and a switching signal output section 2122.
The evaluation unit 2121 evaluates the soundness of the pier BP using the dominant frequency N and the inclination angle C as indicators of soundness.
The switching signal output unit 2122 outputs a switching signal in response to an operation of the input device 220 by an administrator or the like. As described above, the switching signal output by the switching signal output section 2122 is output to the monitoring device 100 via the communication section 211. Note that the switching signal output to the monitoring device 100 is input to the measurement frequency changing unit 1122 via the communication unit 114, as described above.
The database 213 stores the predominant frequency N, inclination angle C, etc. calculated and measured in the past for the pier BP of the bridge B.

The input device 220 is configured with a keyboard, a mouse, etc., and outputs a signal to the data processing device 210 in response to an operation by an administrator or the like.
The output device 230 is a so-called display, and outputs visual information according to the signal output from the data processing device 210.

[Healthiness monitoring method]
Next, the health monitoring method of this embodiment will be explained based on the flowchart of FIG. 4.
As shown in FIG. 4, first, the measurement frequency changing unit 1122 determines whether a switching signal is input via the communication unit 114 (step S1).
If the determination in step S1 is No, the measurement frequency changing unit 1122 sets the normal mode. Then, the measurement frequency changing unit 1122 determines whether the elapsed time TA since the last measurement of the constant microtremor is larger than the constant microtremor measurement interval t1 (step S2).

If the determination in step S2 is Yes, the acceleration sensor 111 constantly measures the slight movement of the pier BP and acquires the measurement data (step S3).
Here, in this embodiment, the continuous microtremor measurement interval t1 is set to 1440 minutes. In other words, in the steady mode, the acceleration sensor 111 constantly measures the microtremor once a day. In this one measurement, measurements are performed multiple times (for example, 5 times) at predetermined intervals (for example, 30 minutes), and the time for one measurement is, for example, more than ten seconds. That is, one measurement of constant microtremor by the acceleration sensor 111 is made up of multiple measurements at predetermined intervals.
Note that the constant microtremor measurement interval t1 is not limited to being set to 1440 minutes, but may be set to 720 minutes, for example, and can be set arbitrarily.

Next, the analysis unit 1121 analyzes the vibration frequency spectrum of the pier BP and calculates the dominant frequency N of the pier BP (step S4).
FIG. 5 is a diagram illustrating an example of spectrum analysis results by the analysis unit 1121.
As shown in FIG. 5, the analysis unit 1121 analyzes the waveform of the temporal change in acceleration during the measurement time using a known method, and indicates the magnitude of vibration for each vibration frequency as an amplitude, thereby determining the vibration frequency of the pier BP. Analyze the spectrum of Then, the analysis unit 1121 calculates, for example, the vibration frequency with the largest amplitude in the predetermined frequency band as the dominant vibration frequency N of the pier BP.
In this embodiment, 0.00 to 10.00Hz is set as the predetermined frequency band. In the example shown in FIG. 5, 3.41 Hz, which is the vibration frequency with the largest amplitude among the predetermined frequency bands of 0.00 to 10.00 Hz, is calculated as the predominant frequency N of the pier BP, and is stored in the storage unit 113. do. When the steady state mode is set, the dominant frequency N stored in the storage section 113 is outputted to the health evaluation device 200 via the communication section 114 as appropriate.
Note that the analysis unit 1121 is not limited to calculating the vibration frequency with the largest amplitude in the predetermined frequency band as the dominant vibration frequency N of the pier BP, but, for example, the analysis unit 1121 is not limited to calculating the vibration frequency with the largest amplitude in the predetermined frequency band as the dominant vibration frequency N of the pier BP. The predominant frequency N may be calculated by performing an analysis. Further, the predetermined frequency band is not limited to 0.00 to 10.00 Hz, and may be, for example, 2.50 to 5.00 Hz, and can be set arbitrarily.

FIG. 6 is a diagram showing an example of the results of monitoring the dominant frequency N in steady mode.
FIG. 6 shows the monitoring results of the dominant frequency N over about two years, and the monitoring results are stored in the database 213 of the health evaluation device 200.
As shown in FIG. 6, by outputting the monitoring result of the dominant frequency N stored in the database 213 to the output device 230, the administrator can check the change over time in the dominant frequency N over a predetermined period. Thereby, the administrator can evaluate the soundness of the pier BP. For example, the administrator can determine that there is an abnormality if the predominant frequency N falls below a reference value set through a prior investigation. Depending on this abnormality determination, the administrator can perform detailed inspections and repairs using impact vibration tests and the like.

Returning to FIG. 4, after the dominant frequency N is calculated in step S4, or when the determination is No in step S2, the measurement frequency changing unit 1122 changes the elapsed time since the previous measurement of the inclination angle C. It is determined whether TL is larger than the first inclination angle measurement interval t21 (step S5).

If the determination in step S5 is No, the process returns to step S1 and repeats the process.
If the determination in step S5 is Yes, the acceleration sensor 111 measures the inclination angle C of the pier BP and obtains the measurement data (step S6).
In this embodiment, the first inclination angle measurement interval t21 is set to 1440 minutes. That is, in the steady mode, the measurement of the inclination angle C by the acceleration sensor 111 is performed once a day. The measured inclination angle C is then stored in the storage unit 113. Here, in this embodiment, when the steady state mode is set, the measurement data of the inclination angle C stored in the storage unit 113 is not output to the health evaluation device 200. That is, when the switching signal is input and the steady state mode is set, the communication unit 114 outputs only the dominant frequency N out of the dominant frequency N and the inclination angle C stored in the storage unit 113.
Note that the first inclination angle measurement interval t21 is not limited to being set to 1440 minutes, and may be set to 720 minutes, for example, and can be set arbitrarily.

Returning to FIG. 4, after measuring the inclination angle C in step S6, the process returns to step S1 and repeats the process.
Then, if the determination in step S1 is Yes, that is, if the switching signal is input to the monitoring device 100, the measurement frequency changing unit 1122 sets the non-regular mode.

Here, in general, in steady state, the water level and flow velocity of the river have little influence on the vibration characteristics of the pier BP, so the dominant frequency N can be calculated with high accuracy from the measurement results by the acceleration sensor 111.

On the other hand, during unsteady times when the river water level rises due to torrential rain, etc., the river water level and flow velocity have a large influence on the vibration characteristics of the pier BP, and the pier BP may vibrate due to collisions with driftwood, etc. . Therefore, it becomes difficult to accurately calculate the dominant frequency N from the measurement results by the acceleration sensor 111. Furthermore, during unsteady conditions, scouring progresses rapidly, increasing the risk of the pier BP sinking or leaning. Therefore, during unsteady conditions, it is effective to evaluate the soundness of the pier BP based on the inclination angle C of the pier BP.

Therefore, in the present embodiment, when the water level of the river R rises or when a rise in the water level of the river R is predicted, the administrator operates the input device 220 to send a switching signal to the monitoring device 100. Output. As a result, the determination in step S1 described above is YES, and the non-normal mode is set.

Then, when the unsteady mode is set, the measurement frequency changing unit 1122 changes the measurement interval of the inclination angle C by the acceleration sensor 111 from the first inclination angle measurement interval t21 to less than the first inclination angle measurement interval t21. The second inclination angle measurement interval t22 is set shorter. That is, the measurement frequency changing unit 1122 increases the measurement frequency of the inclination angle C when the unsteady mode is set.
Then, the measurement frequency changing unit 1122 determines whether the elapsed time TL since the previous measurement of the tilt angle C is larger than the second tilt angle measurement interval t22 (step S6).

If the determination in step S6 is No, the process returns to step S1 and is repeated.
If the determination in step S6 is Yes, the acceleration sensor 111 measures the inclination angle C of the pier BP and obtains the measurement data (step S7).
In this embodiment, the second inclination angle measurement interval t22 is set to 3 minutes. That is, in the unsteady mode, the measurement of the inclination angle C by the acceleration sensor 111 is performed at a measurement frequency of 480 times a day, and the measured inclination angle C is stored in the storage unit 113. When the unsteady mode is set, the inclination angle C stored in the storage unit 113 is outputted to the health evaluation device 200 via the communication unit 114 as appropriate.
Note that the second tilt angle measurement interval t22 is not limited to being set to 3 minutes, but may be set to 5 minutes, for example, and may be set to a shorter time than the first tilt angle measurement interval t21. It would be fine if it had been done.

FIG. 7 is a diagram showing an example of the monitoring results of the tilt angle C in the non-steady mode.
FIG. 7 shows the monitoring results of the inclination angle C for about 10 hours, and the monitoring results are stored in the database 213 of the health evaluation device 200.
As shown in FIG. 7, by outputting the monitoring result of the tilt angle C stored in the database 213 to the output device 230, the administrator can check the change over time in the tilt angle C during an unsteady state. Thereby, the administrator can evaluate the soundness of the pier BP. For example, if the inclination angle C suddenly changes, the administrator can determine that the risk of subsidence or inclination of the pier BP is high. If the manager determines that the above-mentioned risk is high, he or she can take measures to prohibit traffic on the road or railroad provided in the bridge girder BG.

Returning to FIG. 4, after measuring the inclination angle C in step S7, the process returns to step S1 and repeats the process. In this way, in this embodiment, when the unsteady mode is set, the measurement of microtremors by the acceleration sensor 111 is not performed at all times. In other words, the measurement frequency of constant microtremors by the acceleration sensor 111 is changed to 0 times a day. As a result, it is possible to prevent the inclination angle C from becoming impossible to measure due to constant measurement of microtremors, so the inclination angle C can be measured at the second inclination angle measurement interval t22 set as described above.

In the first embodiment as described above, the following effects can be achieved.
(1) In the present embodiment, the measurement frequency changing unit 1122 changes the measurement frequency of the constant microtremor and the inclination angle C by the acceleration sensor 111 based on the switching signal input to the communication unit 114. Therefore, during steady state, the measurement frequency changing unit 1122 increases the measurement frequency by the acceleration sensor 111 based on the input of the switching signal. Thereby, the accuracy of the soundness evaluation of the bridge pier BP based on the dominant frequency N can be increased.
On the other hand, in an unsteady state such as when river water is rising, the measurement frequency changing unit 1122 increases the frequency of measurement of the inclination angle C by the acceleration sensor 111 based on the input switching signal. Thereby, the accuracy of the soundness evaluation of the pier BP based on the inclination angle C can be increased. Therefore, even if the dominant frequency N cannot be calculated with high precision during unsteady conditions such as when river water is rising, the soundness of the pier BP can be appropriately evaluated based on the inclination angle C.

(2) In this embodiment, one acceleration sensor 111 constantly measures the slight movement and the inclination angle C. Therefore, the configuration of the monitoring device 100 can be simplified compared to the case where the microtremor and the inclination angle C are constantly measured using separate sensors.

(3) In this embodiment, the switching signal is input from the health evaluation device 200, that is, from outside the monitoring device 100. Therefore, the configuration of the monitoring device 100 can be simplified, for example, compared to a configuration in which the monitoring device 100 determines whether water in the river R has increased or the like and outputs a switching signal.

(4) In the present embodiment, when the steady state mode is set, the communication unit 114 appropriately outputs the dominant frequency N stored in the storage unit 113 to the health evaluation device 200. That is, since the monitoring device 100 outputs the predominant frequency N, which is the calculation result, instead of the raw data obtained by constantly measuring microtremors, the amount of data transmitted becomes small. Therefore, the time required for data transmission can be reduced.

(5) In the present embodiment, the communication unit 114 outputs the dominant frequency N when the steady mode is set, and outputs the inclination angle C when the unsteady mode is set. As a result, the amount of data to be transmitted is smaller than in the case of transmitting the dominant frequency N and the inclination angle C, so the time required for data transmission can be shortened.

[Second embodiment]
Next, a second embodiment of the present invention will be described based on the drawings.
The second embodiment differs from the first embodiment in that the monitoring device 100A is provided with a water level sensor 140A. In addition, in the second embodiment, the same or similar configurations as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

FIG. 8 is a schematic diagram showing a schematic configuration of a health monitoring system 1A according to the second embodiment.
As shown in FIG. 8, the monitoring device 100A includes a water level sensor 140A.
The water level sensor 140A is a drop-in type sensor installed underwater in the river R, and detects pressure. The water level sensor 140A is connected to the measurement unit 110A by a cable or the like, and outputs a detection signal corresponding to the water level of the river R to the measurement unit 110A. Further, power is supplied to the water level sensor 140A from the power supply unit 130 via a cable or the like.
Note that the water level sensor 140A is not limited to a drop-in type sensor installed in the water of the river R, but may be, for example, an ultrasonic type sensor that is installed on the bridge girder BG and detects the water level of the river R using ultrasonic waves. It is sufficient that the configuration is such that the water level of the river R can be detected. Moreover, the water level sensor 140A and the measurement unit 110A are not limited to being connected by wires such as cables, but may be connected by wireless communication.

[Monitoring device 100A]
FIG. 9 is a block diagram showing a schematic configuration of the monitoring device 100A.
As shown in FIG. 9, the measurement unit 110A includes a control section 112A.
The control unit 112A includes an analysis unit 1121A, a measurement frequency change unit 1122A, and a water level determination unit 1123A.
Further, in this embodiment, a water level sensor 140A is connected to the communication unit 114.

The water level determination unit 1123A receives the detection signal output from the water level sensor 140A via the communication unit 114. When the water level determination unit 1123A determines that the water level of the river R exceeds a predetermined threshold stored in advance in the storage unit 113 based on the above-mentioned detection signal, the water level determination unit 1123A outputs a switching signal to the measurement frequency change unit 1122A. do. That is, in this embodiment, the measurement unit 110A having the water level determination section 1123A constitutes the switching signal output device of the present invention.

Then, similarly to the first embodiment described above, the measurement frequency changing unit 1122A sets the non-normal mode when the switching signal is input. That is, in this embodiment, the measurement frequency changing section 1122A serves as both the input section and the measurement frequency changing section of the present invention.
In addition, in this embodiment, similarly to the first embodiment described above, a switching signal may be input from the health evaluation device 200 via the communication unit 114. According to such a configuration, even if the water level of the river R has not exceeded the predetermined threshold, the administrator operates the input device 220 when the water level of the river R is expected to rise due to increased water, etc. By doing so, a switching signal can be output. Thereby, the slope angle C can be monitored frequently even before the water level of the river R actually rises.

In the second embodiment as described above, the following effects can be achieved.
(6) In this embodiment, a switching signal is input to the measurement frequency changing unit 1122A when the water level of the river R in which the pier BP is provided exceeds a predetermined threshold. As a result, as in the first embodiment described above, the measurement frequency changing section 1122A can change the microtremor measurement section and the The measurement frequency of the tilt angle measurement unit can be changed automatically. Therefore, the administrator can easily manage the bridge B.

[Third embodiment]
Next, a third embodiment of the present invention will be described based on the drawings.
The third embodiment differs from the first and second embodiments in that the soundness evaluation device 200B is provided with a learning section 2123B. In addition, in the third embodiment, the same or similar configurations as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[Soundness evaluation device 200B]
FIG. 10 is a block diagram showing a schematic configuration of the health evaluation device 200B.
As shown in FIG. 10, the health evaluation device 200B includes a data processing device 210B, an input device 220B, and an output device 230B, similarly to the first embodiment described above.
The data processing device 210B is composed of, for example, a server device installed in a management office or the like, and includes a communication section 211B, a control section 212B, and a database 213B. The control section 212B includes an evaluation section 2121B, a switching signal output section 2122B, and a learning section 2123B. Note that the communication unit 211B has the same configuration as the communication unit 211 of the first and second embodiments described above.

[Learning section 2123B]
The learning unit 2123B performs supervised machine learning based on a so-called neural network.
Here, in general, in steady state, the pier BP becomes more likely to vibrate as the amount of earth covering becomes smaller, so the dominant frequency N becomes smaller. In other words, in steady state, there is a correlation between the amount of earth covering of the pier BP and the dominant frequency N. Therefore, in the present embodiment, the learning unit 2123B uses, for example, the actual measured value (health level) of the amount of earth covering of the pier BP measured by acoustic sounding method and the dominant frequency N acquired via the communication unit 211B as training data. Perform machine learning as
Specifically, the neural network constituting the learning unit 2123B has an input layer, an intermediate layer, and an output layer each composed of a plurality of neurons. Then, in a steady state, machine learning is performed so that the estimated value of the amount of earth covering output from the output layer approaches the measured value of the amount of earth covering based on the dominant frequency N input to the input layer.
Note that the trained model learned by the learning unit 2123B is stored in the database 213B. Note that the trained model by the learning unit 2123B is stored in the database 213B prior to the soundness evaluation by the evaluation unit 2121B, but the trained model may be updated at any time while the evaluation unit 2121B performs the evaluation. good.

[Evaluation section 2121B]
The evaluation unit 2121B evaluates the soundness of the pier BP based on the measurement data of the dominant frequency N and inclination angle C acquired via the communication unit 211B, and the learning results (learned model) by the learning unit 2123B. .
Specifically, when the unsteady mode is set, the evaluation unit 2121B evaluates the soundness of the pier BP using the inclination angle C as an index, similarly to the first and second embodiments described above. Furthermore, when the steady state mode is set, the evaluation unit 2121B obtains an estimated value of the amount of overburden by inputting the obtained dominant frequency N into the trained model stored in the database 213B. The evaluation unit 2121B then evaluates the soundness of the pier BP based on the estimated amount of overburden. For example, the evaluation unit 2121B evaluates the soundness of the pier BP by comparing the reference value of the amount of earth covering stored in the database 213B and the estimated value of the amount of earth covering.

In the third embodiment as described above, the following effects can be achieved.
(7) In the present embodiment, the soundness evaluation device 200B includes a learning unit 2123B that learns the predominant frequency N of the pier BP and the measured value of the amount of soil cover as teacher data, and a learning unit 2123B that learns the predominant frequency N of the pier BP and the actual measured value of the amount of soil cover, and the pier BP based on the learning results by the learning unit 2123B. and an evaluation section 2121B that evaluates the soundness of the. Thereby, the accuracy of estimating the health level based on the dominant frequency N can be improved, so the health level of the bridge pier BP can be evaluated more accurately.

It should be noted that the present invention is not limited to the above-described embodiments, and the present invention includes modifications, improvements, etc. within a range that can achieve the object of the present invention.
In each of the embodiments described above, the measurement data of the inclination angle C stored in the storage unit 113 is configured not to be output when the steady state mode is set; however, the measurement data of the tilt angle C stored in the storage unit 113 is not output. The sensor may also be configured to output measurement data of the inclination angle C.

FIG. 11 is a diagram of a modified example showing an example of a monitoring result when measurement data of the inclination angle C is output in the steady state mode.
FIG. 11 shows the results of monitoring the inclination angle C for about six months, and the monitoring results are stored in the databases 213, 213B of the health evaluation devices 200, 200B. In this case, the administrator can evaluate the soundness of the pier BP based on the monitoring results, for example, based on the trend of change over time in the inclination angle C.

In each of the embodiments described above, the monitoring devices 100 and 100A were configured to be able to measure the health of the piers BP of the bridge B spanning the river R, but the monitoring devices 100 and 100A are not limited to this. For example, the monitoring devices 100 and 100A may be configured to be able to measure the soundness of the foundation F of the pier BP and the ground G of the foundation F, and measure the soundness of at least one of the pier BP, the foundation F, and the ground G. It is sufficient if the configuration is possible. That is, the health monitoring system 1 only needs to be configured to be able to monitor the health of at least one of the pier BP, the foundation F, and the ground G.

In the first and third embodiments, the health evaluation devices 200 and 200B also serve as switching signal output devices, but the present invention is not limited thereto. For example, a switching signal output device that outputs a switching signal may be provided separately from the health evaluation devices 200, 200B.

In the first and third embodiments, the switching signal output units 2122 and 2122B were configured to output switching signals in response to the operation of the input devices 220 and 220B by the administrator, but the present invention is not limited to this. For example, the switching signal output units 2122 and 2122B are configured to be able to input water level data of river R, data related to weather forecasts, etc. via an Internet line, etc., and output switching signals according to the water level data, weather forecast data, etc. may be configured to be able to output.

In each of the embodiments described above, the acceleration sensor 111 is configured not to constantly measure microtremors when the non-steady mode is set, but the present invention is not limited to this. For example, when the unsteady mode is set, the acceleration sensor 111 may be configured to constantly measure microtremors less frequently than when the steady mode is set. good. This makes it possible to monitor the predominant frequency N even during unsteady conditions such as when water increases.

In each of the embodiments described above, the monitoring devices 100 and 100A were provided on one pier BP, but the monitoring device is not limited to this. For example, the monitoring devices 100 and 100A may be provided on a plurality of piers BP. Furthermore, monitoring devices 100 and 100A may be provided as a temperature correction control on the pier BP provided on land. In this case, the calculation result of the dominant frequency N by the monitoring device 100, 100A installed on the bridge pier BP in the river R is calculated based on the calculation result of the dominant frequency N by the monitoring device 100, 100A installed on the bridge pier BP in the river R. Temperature correction is possible.

In each of the embodiments described above, the health evaluation devices 200 and 200B are configured as stationary devices such as server devices, but are not limited to this, and may be configured as portable devices such as smartphones and tablet terminals, for example. may have been done.
Moreover, the health evaluation devices 200, 200B may be configured to be incorporated into the monitoring devices 100, 100A. That is, it may be configured to transmit and receive data between the monitoring devices 100 and 100A.

In each of the embodiments described above, the monitoring devices 100 and 100A were configured to output the dominant frequency N stored in the storage unit 113 via the communication unit 114, but the present invention is not limited to this. For example, the monitoring devices 100 and 100A may be configured to store the spectrum analysis results analyzed by the analysis units 1121 and 1121A in the storage unit 113 and output the spectrum analysis results.
Moreover, in this case, the health evaluation apparatus 200, 200B may be provided with an analysis section that calculates the dominant frequency N.

In each of the embodiments described above, the measurement units 110 and 110A of the monitoring devices 100 and 100A are unitized, but the measurement units 110 and 110A are not limited to this. For example, the communication unit 114 may be installed together with the solar panel 120 on a street light pole LP on the bridge girder BG. Further, the acceleration sensor 111 is not limited to being housed in a case, and may be installed directly on the upper surface of the pier BP, for example.

In each of the embodiments described above, the power supply unit 130 includes the solar panel 120, the storage battery 115, the backup battery 116, and the switching unit 117, but is not limited thereto. For example, the power supply unit 130 may not include the backup battery 116.
Further, the power supply unit 130 may be configured from either the solar panel 120 or the storage battery 115.
Furthermore, the power supply unit 130 may be configured to be able to receive power from outside the monitoring device 100. In this case, the power supply section 130 does not need to include the solar panel 120, the storage battery 115, the backup battery 116, and the switching section 117.

In the third embodiment, the learning unit 2123B was configured to perform machine learning using the actual measured value of the amount of earth covering of the pier BP and the dominant frequency N acquired via the communication unit 211B as training data. , but not limited to. Generally, the slope angle of a bridge pier increases as the amount of earth covering decreases.In other words, there is a correlation between the slope angle and the amount of earth covering. Machine learning may be performed using the tilt angle as teacher data. In this case, when the steady mode is set, the evaluation unit evaluates the soundness of the pier based on the estimated amount of earth cover and the predominant frequency estimated based on the learned model by the learning unit. may be configured.
Furthermore, the learning unit may be configured to perform machine learning using the measured value of the amount of earth covering of the pier, the dominant frequency, and the angle of inclination as training data. In other words, the neural network constituting the learning section is configured so that, in steady state, the estimated value of the amount of soil cover output from the output layer approaches the actual value of the amount of soil cover based on the dominant frequency and slope angle input to the input layer. Additionally, it may be configured to perform machine learning.

1, 1A... Health monitoring system, 100, 100A... Monitoring device, 110, 110A... Measurement unit, 111... Acceleration sensor, 112, 112A... Control section, 113... Storage section, 114... Communication section (input section, output section ), 115...Storage battery, 116...Backup battery, 117...Switching section, 120...Solar panel, 130...Power supply section, 140A...Water level sensor, 1121, 1121A...Analysis section, 1122, 1122A...Measurement frequency change section, 1123A ...Water level determination section, 200, 200B... Health evaluation device (switching signal output device), 211, 211B... Communication section (acquisition section), 212, 212B... Control section, 213, 213B... Database, 220, 220B... Input device , 230, 230B...Output device, 2121, 2121B...Evaluation unit, 2122, 2122B...Switching signal output unit, 2123B...Learning unit.

Claims (9)

A monitoring device installed on a pier and measuring the soundness of at least one of the pier, the foundation of the pier, and the ground of the foundation,
a continuous microtremor measurement unit configured to be able to constantly measure microtremors of the pier;
an inclination angle measurement unit configured to be able to measure the inclination angle of the pier;
an analysis unit that calculates a dominant frequency of the bridge pier based on the measurement data of the continuous microtremor by the continuous microtremor measurement unit;
an input section configured to be able to input a switching signal;
a measurement frequency changing unit that stops the continuous microtremor measurement by the continuous microtremor measurement unit and increases the frequency of measurement of the inclination angle by the inclination angle measurement unit, based on the switching signal input to the input unit; A monitoring device comprising: The monitoring device according to claim 1,
A monitoring device characterized in that the constant microtremor measuring section and the inclination angle measuring section are constituted by an acceleration sensor. The monitoring device according to claim 1 or claim 2,
The monitoring device is characterized in that the switching signal is input to the input unit when the water level of the river in which the bridge pier is installed exceeds a predetermined threshold. The monitoring device according to any one of claims 1 to 3,
A monitoring device characterized in that the switching signal is input from outside. The monitoring device according to any one of claims 1 to 4,
a storage unit configured to be able to store measurement data of the inclination angle by the inclination angle measurement unit and the dominant frequency calculated by the analysis unit;
A monitoring device comprising: an output section configured to be able to output the measurement data of the inclination angle and the predominant frequency stored in the storage section. The monitoring device according to claim 5,
The output section outputs the predominant frequency when the switching signal is not input to the input section, and outputs the measurement data of the tilt angle when the switching signal is input to the input section. monitoring equipment. A health monitoring system that monitors the health of at least one of a pier, a foundation of the pier, and the ground of the foundation,
a monitoring device installed on the pier;
a health evaluation device configured to be able to communicate with the monitoring device;
a switching signal output device configured to be able to output a switching signal to the monitoring device,
The monitoring device includes:
a continuous microtremor measurement unit configured to be able to constantly measure microtremors of the pier;
an inclination angle measurement unit configured to be able to measure the inclination angle of the pier;
an analysis unit that calculates a dominant frequency of the bridge pier based on the measurement data of the continuous microtremor by the continuous microtremor measurement unit;
an input section configured to be able to input the switching signal output from the switching signal output device;
a measurement frequency changing unit that stops the continuous microtremor measurement by the continuous microtremor measurement unit and increases the frequency of measurement of the inclination angle by the inclination angle measurement unit, based on the switching signal input to the input unit; and,
a storage unit configured to be able to store measurement data of the inclination angle by the inclination angle measurement unit and the dominant frequency calculated by the analysis unit;
an output section configured to be able to output the measurement data of the inclination angle and the predominant frequency stored in the storage section,
The soundness evaluation device includes:
an acquisition unit that acquires measurement data of the dominant frequency and the inclination angle output from the monitoring device;
A health monitoring system comprising: an evaluation section that evaluates the health of the bridge pier based on the measurement data of the dominant frequency and the inclination angle acquired by the acquisition section. A health monitoring system that monitors the health of at least one of a pier, a foundation of the pier, and the ground of the foundation,
a monitoring device installed on the pier;
a health evaluation device configured to be able to communicate with the monitoring device;
a switching signal output device configured to be able to output a switching signal to the monitoring device,
The monitoring device includes:
a continuous microtremor measurement unit configured to be able to constantly measure microtremors of the pier;
an inclination angle measurement unit configured to be able to measure the inclination angle of the pier;
an analysis unit that calculates a dominant frequency of the bridge pier based on the measurement data of the continuous microtremor by the continuous microtremor measurement unit;
an input section configured to be able to input the switching signal output from the switching signal output device;
a measurement frequency changing unit that stops the continuous microtremor measurement by the continuous microtremor measurement unit and increases the frequency of measurement of the inclination angle by the inclination angle measurement unit, based on the switching signal input to the input unit; and,
a storage unit configured to be able to store measurement data of the inclination angle by the inclination angle measurement unit and the dominant frequency calculated by the analysis unit;
an output section configured to be able to output the measurement data of the inclination angle and the predominant frequency stored in the storage section,
The soundness evaluation device includes:
an acquisition unit that acquires measurement data of the dominant frequency and the inclination angle output from the monitoring device;
a learning unit that learns the predominant frequency and the soundness of the pier as training data;
and an evaluation unit that evaluates the soundness of the bridge pier based on the measurement data of the dominant frequency and the inclination angle acquired by the acquisition unit and the learning results by the learning unit. degree monitoring system. A health monitoring system that monitors the health of at least one of a pier, a foundation of the pier, and the ground of the foundation,
a monitoring device installed on the pier;
a health evaluation device configured to be able to communicate with the monitoring device;
a switching signal output device configured to be able to output a switching signal to the monitoring device,
The monitoring device includes:
a continuous microtremor measurement unit configured to be able to constantly measure microtremors of the pier;
an inclination angle measurement unit configured to be able to measure the inclination angle of the pier;
an analysis unit that calculates a dominant frequency of the bridge pier based on the measurement data of the continuous microtremor by the continuous microtremor measurement unit;
an input section configured to be able to input the switching signal output from the switching signal output device;
a measurement frequency changing unit that stops the continuous microtremor measurement by the continuous microtremor measurement unit and increases the frequency of measurement of the inclination angle by the inclination angle measurement unit, based on the switching signal input to the input unit; and,
a storage unit configured to be able to store measurement data of the inclination angle by the inclination angle measurement unit and the dominant frequency calculated by the analysis unit;
an output section configured to be able to output the measurement data of the inclination angle and the predominant frequency stored in the storage section,
The soundness evaluation device includes:
an acquisition unit that acquires measurement data of the dominant frequency and the inclination angle output from the monitoring device;
a learning unit that learns the inclination angle and the soundness of the pier as teacher data;
and an evaluation unit that evaluates the soundness of the bridge pier based on the measurement data of the dominant frequency and the inclination angle acquired by the acquisition unit and the learning results by the learning unit. degree monitoring system.

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