JP2020016115A - Road monitoring system - Google Patents

Abstract

To enable monitoring abnormalities due to displacement of a monitoring object at a low cost and with a long service life.SOLUTION: A monitoring system for monitoring a structure constituting a road comprises at least: an inclinometer 10 that is attached to a monitoring object so as to be capable of measuring an inclination angle of the monitoring object; measurement control means 20 for managing the execution of a measurement work by the inclinometer 10; inclination information generating means 30 for specifying inclination information of the monitoring object using at least the measured value of the inclinometer 10; and display means 40 for generating a monitoring screen formed by displaying a mark on which the inclination information is visualized on a map. A monitoring object abnormality is detected by capturing the displacement of the monitoring object with a change in the inclination angle by the inclinometer 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a road monitoring system for detecting an abnormality caused by a displacement of a structure constituting a road.

The applicant has invented a crack monitoring device described in Patent Literature 1 below as a device for monitoring the growth of a crack generated in a structure such as a bridge.
This crack monitoring device was configured and provided with a disconnection gauge attached to a structure to be monitored, a control circuit for generating and transmitting crack propagation information from an electric signal from the disconnection gauge, and a portable terminal, and collected. This is an invention that enables examination of a portion requiring repair using crack propagation information.
Since this crack monitoring device is small and low-cost, it can reduce the cost burden when introducing it even on an expressway where there are many monitoring places, and can be driven for more than 5 years. It has an excellent effect in that the cost burden of safety measures such as installation of a working scaffold for approach monitoring and closing of a road below does not frequently occur.

The applicant has developed a device that is capable of detecting a girder shift or a falling bridge of a bridge, for example, assuming that a structure to be monitored is a bridge, as a derivative of a small monitoring device such as the crack monitoring device. Embarked.
In Non-Patent Document 1 below, a laser distance meter is installed on a bridge as a technique for detecting a girder shift or a dropped bridge of a bridge, and an adjacent bridge or pier is used as a laser irradiation destination. Methods for capturing change are disclosed.

Patent No. 6059943

"National Institute of Advanced Industrial Science and Technology, Research Report, Chapter 7, Development of Monitoring and Deformation Detection Methods for Structures Using Position Measurement" http://www.nilim.go.jp/lab/bcg/siryou/kpr/prn0050pdf/ kp005011.pdf

  However, the above-mentioned laser rangefinder consumes a large amount of power, and when it is assembled into a small device, the battery is drastically consumed, so that long-life driving at the site where replacement work can not be performed frequently is said to be realized. There was a problem that the original purpose was lost.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide at least one of means for monitoring an abnormality associated with displacement of a monitoring target with low cost and long life.

A first invention of the present application which has been made to solve the above-mentioned problem is a monitoring system for monitoring a structure constituting a road, wherein the monitoring system is attached to a monitoring target and can measure a tilt angle of the monitoring target. And a measurement control unit that manages the execution of a measurement operation by the inclinometer, and generates inclination information including at least one of a step amount to be monitored and a bridge drop information using at least a measurement value of the inclinometer. And a display means for generating a monitoring screen for displaying a mark visualizing the tilt information on a map.
According to a second invention of the present application, in the first invention, the measurement control means periodically executes a measurement operation by the inclinometer.
In a third aspect of the present invention, in the first or second aspect, when the measurement control means detects or acquires earthquake information, the measurement operation is performed by the inclinometer. It is.
In a fourth aspect of the present invention, in the third aspect, the measurement control means has a seismic intensity meter attached to the monitored object, and when an earthquake is detected by the seismic intensity meter, a measurement operation by the inclinometer is performed. Performing,
Further, according to a fifth invention of the present application, in any one of the first invention to the fourth invention, the mark has at least four regions indicating front, rear, left and right of the monitoring target, and Are displayed in different colors based on the tilt information.

According to the present invention, at least one of the following effects can be obtained.
(1) Since the displacement of the monitoring target is captured by the change in the tilt angle by the inclinometer, which consumes less power than the laser rangefinder, even when monitoring a bridge or the like where it is difficult to secure a power supply, the built-in battery can be used for a long time. Can be driven. Especially for highway bridges, etc., it is necessary to block roads under the highway for scaffolding work to install inclinometers. Contributes to the suppression.
(2) By displaying, on a map, a mark that visualizes the inclination information, which is at least one of the step amount of the monitoring target and the bridge information, on the map, it is easy to grasp the monitoring target having a high risk.
(3) The measurement control means periodically executes the inclination measurement work, whereby the detection of the abnormality can be immediately grasped.
(4) A seismometer is separately provided for the monitoring object, and the inclination measurement work is performed after the detection of the earthquake by the seismometer, so that it is possible to judge the possibility of road traffic immediately after the occurrence of the earthquake.
(5) By configuring a mark that visualizes the inclination information including at least one of the step amount and the falling bridge information of the monitoring target so as to have at least four regions indicating front, rear, left, and right inclinations of the monitoring target, It is possible to visually grasp in which direction the displacement of the monitoring target occurs.

FIG. 1 is a functional block diagram of a road monitoring system according to the present invention. The figure which shows the example of a display of a mark. The figure which shows the example of a shape of a mark. FIG. 1 is a schematic diagram showing a specific example 1 of a road monitoring system according to the present invention. The schematic diagram showing example 2 of the road monitoring system concerning the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1> Overall configuration (Fig. 1)
The road monitoring system according to the present invention mainly targets a structure constituting a road, such as a bridge or a pier, as a monitoring target, and monitors whether there is any abnormality in the structure due to displacement of the monitoring target.
As shown in FIG. 1, the road monitoring system according to the present invention has at least an inclinometer 10, a measurement control unit 20, an inclination information generation unit 30, and a display unit 40.
Hereinafter, details of each element will be described.

<2> Inclinometer (Fig. 1)
The inclinometer 10 is a device for measuring a tilt angle of a monitoring target.
As the inclinometer 10, a known inclinometer such as an accelerometer capable of detecting the inclination of the monitoring target by detecting the direction of the gravitational acceleration can be used.

<2.1> Method of Measuring Tilt Angle The inclinometer 10 may measure the tilt angle of the monitoring target by an absolute value, or initializes the initial state attached to the monitoring target to 0 °, and sets the initial state. May be measured.

<3> Measurement control means (FIG. 1)
The measurement control unit 20 is a unit for managing the execution of the measurement operation by the inclinometer 10.
The measurement control unit 20 can be configured by an information processing device or the like that executes predetermined information processing by a program installed in advance.

<3.1> Sleep control function The measurement control means 20 sets the other devices constituting the monitoring terminal A to a sleep state, automatically starts up by a timer, and returns the other devices from the sleep state. Can be configured.
The measurement control means 20 is configured to be activated by an instruction from the seismometer or the server B separately provided in the monitoring terminal A shown in FIGS. You may.

<4> Tilt information generating means (FIG. 1)
The tilt information generating unit 30 is a unit for generating tilt information of a monitoring target using at least a measured value of the inclinometer 10.
The inclination information generating means 30 can be configured by an information processing device or the like that executes predetermined information processing by a program installed in advance.
Further, the tilt information is information including at least one of the step amount of the monitoring target and the falling bridge information, which is obtained by using at least the measurement value obtained from the inclinometer 10.

<4.1> Example of Generating Tilt Information For example, assuming that a monitoring target is a bridge, as an example of generating the tilt information of the bridge, a measurement value acquired from the inclinometer 10 is a predetermined value (threshold) in advance. If the number of bridges exceeds the limit, there is a method of estimating that there is a high possibility that a step on the bridge or a dropped bridge has occurred.
Note that the above-described threshold value can be appropriately set according to the environment and specifications of the monitoring target. For example, at the same gradient, the longer the total length of the bridge is, the larger the vertical step amount of the bridge is. Therefore, the threshold value for the determination based on the inclination angle is set to a relatively low value.
As another generation example, the displacement amount in the vertical direction of the bridge is calculated each time from the measured value obtained from the inclinometer 10 and the total length (length in the horizontal direction) of the bridge, and the displacement amount is set to a predetermined value (the threshold value). Value), it is conceivable that there is a high possibility that bridge misalignment or a bridge drop has occurred.
From the state where the initial state of the bridge is installed horizontally, the calculation formula when the total length of the bridge is L, the inclination angle is α, and the displacement amount (step amount) is ΔL can be obtained by [ΔL = L × tan α]. it can.

  If these thresholds are individually set by using the specifications of the bridge previously stored in the database, more appropriate monitoring becomes possible.

  If the bridge falls horizontally, it will not be possible to detect the displacement of the bridge from the measured tilt angle.However, the accelerometer used as the inclinometer always measures the acceleration. For example, the displacement of the bridge can be detected by detecting the change in acceleration.

<5> Display means (FIG. 1)
The display unit 40 is a unit for generating a screen in which the mark 60 in which the inclination information of the monitoring target is visualized is displayed on the map 51.
The display means 40 can be constituted by an information processing device that executes predetermined information processing by a program installed in advance.

Display example of <5.1> mark (Fig. 2)
FIG. 2 shows a display example of the mark 60.
Each mark 60 plots the installation position of the inclinometer 10 on a map 51 at a position registered in advance, or based on coordinate information or the like acquired from a GPS provided separately from the inclinometer 10, based on the inclinometer. The ten installation locations can be plotted on the map 51 in real time.
In FIG. 2, the mark 60 has a circular shape, and the inside of the circle is displayed in different colors according to the degree of risk based on the slope information including at least one of the step amount and the falling bridge information.
Although not shown, the present invention may be configured so that the shape of the mark 60 is changed into a circle, a triangle, a cross, or the like depending on the degree of danger.
The above configuration is preferable in that it is easy to grasp a monitoring target having a high risk.

<5.2> Example of mark shape (Fig. 3)
The mark 60 may be configured such that the mark 60 is divided into a plurality of regions 61 so that the tilt direction of the monitoring target can be recognized.
FIG. 3 shows another example of the shape of the mark 60.
In each of FIGS. 3A to 3F, the mark 60 is constituted by four regions 61 each showing an inclination in the vertical direction (running direction) and the horizontal direction (width direction).
By changing the display mode for each area 61 based on the inclination information including at least one of the step amount of the monitoring target and the information on the falling bridge, the magnitude of the step amount of the monitoring target and the presence / absence of the falling bridge can be visually determined. Can be grasped.

<6> Specific example 1 of configuration (FIG. 4)
Hereinafter, a specific example 1 of the configuration of the road monitoring system according to the present invention will be described with reference to FIG.

<6.1> Monitoring Terminal The monitoring terminal A is a device provided for a monitoring target.
In this embodiment, the monitoring terminal A is attached to a bridge on a highway.
The monitoring terminal A according to FIG. 4 is configured by a small information processing apparatus including the inclinometer 10 and the measurement control unit 20 described above.
This information processing apparatus can adopt a mode in which software is incorporated in dedicated hardware, a mode in which an application is installed in an existing smartphone or mobile terminal, or the like, and the like.

<6.2> Server The server B is a device connected to each of the monitoring terminals A via a network.
Although the installation location of the server B is not particularly limited, it is usually installed in a facility specialized in installation and operation of an information processing device such as a so-called data center.
The server B according to FIG. 4 has a function for realizing the above-described determination information generation means and display means 40.

<6.3> User Terminal The user terminal C is a device used by a user of the system according to the present invention.
The user terminal C according to FIG. 4 is assumed to be an information processing device such as a PC installed at the work place of the user or a terminal such as a smartphone carried by the user.
The user accesses the server B from the user terminal C, and can check the bridge inclination information from the display of the user terminal C using the display unit 40 provided in the server B.
This confirmation method includes a method of listing the measured values of the inclinometer 10 and the inclination information of the bridge for each attached monitoring terminal A, and showing the inclination information of the bridge at the position of the bridge to be monitored shown on the map 51. There is a method of plotting the mark 60 and the like.

<6.4> Operation method An example of the operation method in this configuration is shown below.
<6.4.1> Normal operation (1) The measurement control means 20 provided in the monitoring terminal A is driven by a timer to periodically acquire the measurement value of the inclinometer 10, and transmits the measurement value to the server B.
(2) The determination information generation means provided in the server B generates inclination information based on the acquired measurement values of the inclinometer 10.
(3) The display means 40 provided in the server B sets the inclination information in a state that can be confirmed from the user terminal C.

<6.4.2> When an Earthquake Occurs When an earthquake occurs, the measurement control unit 20 acquires the measurement value of the inclinometer 10 when the seismometer provided in the monitoring terminal A is equal to or higher than a predetermined seismic intensity. Send to B. Subsequent processing is the same as in the normal case described above.

<7> Specific example 2 of configuration (FIG. 5)
Hereinafter, a specific example 2 of the configuration of the road monitoring system according to the present invention will be described with reference to FIG.
The difference from the first configuration example (FIG. 4) is that the measurement control means 20 is provided on the server B side, and the server B transmits an execution command of the measurement work by the inclinometer 10 to the monitoring terminal A. .
Therefore, the server B periodically transmits an execution command of the measurement work by the inclinometer 10 to the monitoring terminal A at normal times, and when an earthquake occurs, after receiving the earthquake early warning signal, the seismic intensity at the location of the monitored bridge is received. May be transmitted to the monitoring terminal A when the seismic intensity is equal to or greater than the predetermined seismic intensity.

In the first embodiment described above, the monitoring target is a bridge on a highway. However, the present invention is not limited to a road other than a road as long as it can detect an abnormality such as the discovery of a large step or the presence or absence of a dropped bridge depending on the inclination state. The structure can be monitored.
Other structures include, for example, a railway bridge and a tunnel.

Reference Signs List 10 inclinometer 20 measurement control means 21 seismometer 30 inclination information generation means 40 display means 50 display screen 51 map 52 monitoring target 60 mark 61 area A monitoring terminal B server C user terminal

Claims (5)

A monitoring system for monitoring a structure constituting a road,
An inclinometer attached to the monitored object and capable of measuring the tilt angle of the monitored object,
Managing the execution of measurement work by the inclinometer, measurement control means,
Using at least the measured value of the inclinometer to generate tilt information consisting of at least one of the step amount and the bridge information of the monitoring target, tilt information generating means,
Display means for generating a monitoring screen for displaying a mark on which the inclination information is visualized on a map,
Characterized by having at least
Road monitoring system. Wherein the measurement control unit periodically performs a measurement operation by the inclinometer,
The road monitoring system according to claim 1. When the measurement control unit detects or acquires earthquake information, the measurement control unit performs a measurement operation using the inclinometer.
The road monitoring system according to claim 1. The measurement control means has a seismic intensity meter attached to the monitored object, and performs an operation of measuring with the inclinometer when the seismic intensity sensor detects an earthquake.
The road monitoring system according to claim 3. The mark has at least four regions indicating front, rear, left and right of the monitoring target, and each of the regions is displayed in different colors based on the tilt information.
The road monitoring system according to any one of claims 1 to 4.

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