JP2001318028A - System and method for monitoring continuity health of bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a function for monitoring continuity of girders indicating soundness of a bridge, and provide a fuction capable of detecting a trouble in the bridge in an early stage to specify a troubled portion safely. SOLUTION: This monitoring system is provided with an optical fiber laid in the bridge girders for connecting the start point of a passage of the bridge to its end point, a light emitting part for inputting an optical signal from a connection end of the optical fiber, a reflection part for reflecting the propagated signal in the other end to generate a reflection signal, a light receiving part for receiving the reflection signal in the connection end of the optical fiber, a control part for controlling the light emitting part and the light receiving part, and an announcing part for announcing the trouble of the bridge girder when the reflection signal of a prescribed condition is not received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In continuous bridges used for roads and railways, it is important to detect damage caused by earthquakes and landslides as soon as possible. This is because early detection of damage to a bridge and traffic regulation can take appropriate measures, such as preventing the occurrence of a secondary disaster.

Hitherto, the discovery of damage after an earthquake or heavy rain has been performed manually by site reconnaissance after confirming the magnitude of the earthquake and observing the conditions of rainfall. For this reason, the bridge was left unattended until the survey personnel arrived at each bridge. Therefore, it was sometimes difficult to quickly prevent a secondary disaster after the damage occurred.

[0004] In addition, even if an investigator arrives at each bridge, there is a case where the situation of the damage cannot be accurately investigated when a danger of collapse is predicted. On the other hand, conventionally, as a method of detecting damage to a bridge at an early stage, a method of estimating damage to the bridge based on observation data of seismometers and rain gauges installed in the surrounding area of the bridge is known. However, this method has a problem that the estimation result is not reliable because the bridge damage cannot be directly detected.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and provides a function of directly monitoring the continuity of a girder indicating the soundness of a bridge. Technical issues. As a result, the present invention provides a function that can detect a failure in a bridge at an early stage and safely specify a failure location.

[0006]

The present invention has the following features to attain the object mentioned above. That is, the present invention directly monitors the continuity of the bridge by optical fibers.
Then, by detecting the disconnection, a fault occurrence and a fault location are specified.

According to the present invention, in a bridge monitoring apparatus, an optical fiber laid on a bridge girder connecting a bridge starting point to an end point, a light emitting unit for inputting an optical signal from an optical fiber connection end, and an optical fiber A reflecting unit that reflects an optical signal propagated at the other end of the optical fiber and generates a reflected signal; a light receiving unit that receives the reflected signal at the connection end of the optical fiber; a control unit that controls the light emitting unit and the light receiving unit; And a notifying unit for notifying the failure of the bridge girder when the light receiving unit cannot receive the reflected signal of the condition.

[0008] On the condition that the light receiving unit does not receive the reflected signal after a predetermined time has elapsed after the light emitting unit has input the optical signal,
You may make it alert | report the obstacle of a bridge girder. Moreover, the failure of the bridge girder may be notified on condition that the light receiving unit does not receive the reflected signal having the predetermined amplitude or more.

A plurality of such optical fibers may be laid from the start point to the end point or from the start point to the midway point of the bridge girder connecting the bridge start point to the end point. In this case, when the light-receiving unit cannot receive the reflected signal under the predetermined condition, the fault of the optical fiber is recognized, and the bridge girder beyond the other end of the longest optical fiber among the optical fibers for which the fault is not recognized is located at the fault location. It may be estimated as

The present invention relates to a bridge monitoring system for detecting a failure in a bridge by certifying a failure in an optical fiber laid on a bridge girder connecting a bridge starting point to an end point. An optical signal input / output unit for connecting fibers and inputting / outputting an optical signal at a connection end of each optical fiber, one or more optical fibers having different lengths connected to the optical signal input / output unit, and each optical fiber May be provided with at least one failure detection device including a reflection unit that reflects an optical signal propagated at the other end of the device and generates a reflection signal, and a management device that manages the failure detection device.

The optical signal input / output section includes a light emitting section for inputting an optical signal from a connection end of each optical fiber, a light receiving section for receiving a reflected signal, a control section for controlling the light emitting section and the light receiving section, A transmitting unit for transmitting information according to a command of the unit,
The bridge girder is provided at at least one of a travel start point, an end point, and a way point from the travel start point to the end point, and divides a bridge girder into one or more monitoring sections.

The optical fiber is laid from each connected optical signal input / output unit to one or more points in the monitoring section. The control unit recognizes a fault in the optical fiber when the light receiving unit cannot receive a reflected signal of a predetermined condition, and the transmitting unit determines information related to the fault detecting device (or information related to the monitoring section). And transmitting information on the optical fiber for which the failure has been identified or information relating to the optical fiber for which the failure has not been identified to the management device.

[0013] Further, the management device includes a receiving unit for receiving information from the transmitting unit, an estimating unit for estimating a fault position of the bridge from the received information, and a notifying unit for notifying the fault. The estimating unit sets a healthy section from the installation position of the optical signal input / output unit in the failure detection device (or the monitoring section) where the failure has occurred to the longest optical fiber laying range excluding the optical fiber for which the failure has been identified, An area beyond the optical fiber laying range may be estimated as a failure section.

When the light receiving unit cannot receive the reflected signal under the predetermined condition, the control unit determines that the optical fiber has a fault, and the control unit determines that the length of the longest optical fiber is laid out excluding the faulty optical fiber. The section may be assumed to be a faulty section beyond the laying range of the optical fiber, and the transmitting unit may transmit information related to the faulty section (or information related to a healthy section). In this case, the management device may include a receiving unit that receives information from the transmitting unit, and a notifying unit that notifies the received information, and may notify a faulty section or a healthy section.

In these, the management device may be used also as any one of the optical signal input / output units.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 to 5, 8 and 9. FIG.

FIGS. 1 and 2 are diagrams for explaining the principle of the bridge monitoring apparatus according to the present embodiment. FIG. 3 is a diagram showing a hardware configuration of the optical signal input / output unit 1 shown in FIG. FIG. 4 is a diagram showing an example of application of this bridge monitoring device to a bridge, and FIG. 5 is a flowchart showing processing of a failure detection program executed by the CPU 22 of FIG.
FIG. 9 is a diagram showing the laying position of the optical fiber. <Principle of Failure Detection> FIGS. 1 and 2 show the principle of failure detection. As shown in FIGS. 1 and 2, a failure detection device according to the present embodiment includes an optical fiber 2 laid on a bridge and an optical signal input / output unit 1 for inputting / outputting an optical signal to / from the optical fiber 2.
And a reflection unit 3 that reflects an optical signal input from the optical signal input / output unit 1 and propagated through the optical fiber 2.

The optical fiber 2 is laid on a bridge. FIG.
In the normal state, the optical signal 4 input from the optical signal input / output unit 1 propagates through the optical fiber 2 and reaches the reflection unit 3. The reflection unit 3 includes an optical coupler (not shown) and a reflection mirror. The optical signal 4 arriving at the reflecting section 3 is reflected by a reflecting mirror via an optical coupler. The reflection signal 5 generated at this time is again input to the optical fiber 2 via the optical coupler.

The reflected signal 5 propagates through the optical fiber 2 and reaches the optical signal input / output unit 1 after a lapse of a predetermined time. At this time,
The amplitude of the reflection signal 5 detected by the optical signal input / output unit 1 has a specific value depending on the loss in the optical fiber 2 and the reflection coefficient of the reflection unit 3.

On the other hand, if a damage occurs to the bridge, in particular, to the continuity of the bridge girder constituting the bridge, and
The optical fiber 2 laid on the bridge is also cut. FIG.
A case where such an optical fiber 2 is cut is shown. At this time, even if the optical signal 4 is input as in FIG.
This optical signal 4 does not reach the reflecting section 3.

In this case, depending on the state of the cutting portion 6,
A reflected signal 5a can occur. However, the optical signal input / output unit 1
Is different from the distance from the optical signal input / output unit 1 to the reflection unit 3. Therefore, the time required for the reflected signal 5a to return to the optical signal input / output unit 1 is different from that in FIG. Further, the reflection signal at the cut portion is weaker than the reflection signal at the reflection unit 3. Therefore, when the attenuation in the optical fiber 2 is small, the amplitude of the reflected signal 5 a generated at the cut portion 6 is smaller than the amplitude of the reflected signal 5 by the reflecting section 3.

Therefore, by monitoring the time delay or amplitude of the reflected signal 5 in the optical signal input / output unit 1,
Cutting of the optical fiber 2 and damage of the bridge can be detected.
In this case, the optical fibers 2 are preferably provided on both sides of the bridge girder 8. FIG. 8 is a diagram in which a plurality of piers 9 are arranged in a direction crossing a river 100 with respect to a river 100 flowing in the left-right direction on the drawing, and the piers 9 are connected to each other by a bridge girder 8. FIG. 8 shows a state where the bridge girder 8 has moved due to the earthquake and the bridge has been curved. Optical fibers 2a and 2b are laid on both sides of the bridge girder.

When the bridge girder 8 moves due to the earthquake and the bridge curves in a horizontal plane, the optical fiber laid inside the curved bridge is not cut, but the optical fiber laid outside the curved bridge is cut. It is likely to be performed (cut portion 6 in FIG. 8). Therefore, when the optical fibers 2a and 2b are installed on both sides of the bridge girder 8, the possibility of detecting damage to the bridge girder 8 increases.

As shown in FIG. 9, when a plurality of bridge girders 18a, 18b, 18c and 18d are arranged side by side between two piers 9, the outside of the outermost bridge girders 8a and the outside of 8d It is preferable to install the optical fibers 2a and 2b in the optical fiber. <Structure> FIG. 3 shows the hardware structure of the optical signal input / output unit 1. The optical signal input / output unit 1 is connected to the optical fiber 2, and inputs and outputs an optical signal to and from the optical fiber 2, and emits an optical signal to the optical fiber 2 via the optical coupler 13. Element (semiconductor laser) 11 and optical coupler 1
3, a light receiving element (phototransistor) 12 for receiving an optical signal, an optical signal driving circuit 10 for driving the light emitting element 11 and detecting a light receiving signal of the light receiving element 12, and a memory for storing data and programs 21 and a CP for executing a program and providing a function as the optical signal input / output unit 1
A U22, an alarm device 23 that is controlled by the CPU 22 and issues an alarm when a bridge damage is detected, and a communication device 24 that wirelessly transmits and receives data when communicating with a host computer (not shown).

The optical coupler 13 is composed of a half mirror, and transmits the optical signal from the light emitting element 11 straight to the optical fiber 2 while demultiplexing the reflected signal from the optical fiber 2 to the light receiving element 12. To communicate.

The light emitting element 11 is supplied with power from the optical signal drive circuit 10 and generates a laser beam having an extremely narrow emission angle range. The laser light enters the optical fiber 2 via the optical coupler 13.

When the light receiving element 12 receives the reflected signal output from the optical fiber 2 via the optical coupler 13, the light receiving element 12 converts the signal into an electric signal and transmits the electric signal to the optical signal drive circuit 10. The optical signal drive circuit 10 drives the light emitting element 11 according to a command from the CPU 22 to generate a laser beam. The optical signal drive circuit 10 A / D converts the electric signal output from the light receiving element 12 and transmits the electric signal to the CPU 22.

The memory 21 stores programs executed by the CPU 22 and data processed by the CPU 22. C
The PU 22 executes a program stored in the memory 21 and controls the entire optical signal input / output unit 1. That is, CP
U22 controls the optical signal drive circuit 10 and controls the optical fiber 2
An optical signal (laser) is made incident on the substrate. Further, the CPU 22 reads the reflected signal from the optical fiber 2 received by the light receiving element 12 via the optical signal drive circuit 10.

The CPU 22 analyzes the reflected signal from the optical fiber 2 to determine whether a failure has occurred. When a failure occurs, the CPU 22 notifies an alarm via the alarm device 23.

Under the control of the CPU 22, the alarm device 23 issues an alarm by image and sound. <Operation and Effect> FIG. 4 shows a case where the bridge is damaged while the optical signal input / output unit 1 and the optical fibers 2 (2a and 2b) are installed on the bridge.

This bridge has girder portions 8a, 8b and 8c. The optical signal input / output unit 1 is installed at the left end of the bridge (the left end of the leftmost girder 8a). The optical fiber 2a has one end connected to the optical signal input / output unit 1 and the other end placed on the central beam 8b. That is, the optical fiber 2a is laid from the column 8a to the column 8b. The optical fiber 2b is similarly laid across the beam portions 8a to 8c. A reflector 3 is connected to the ends of the optical fibers 2a and 2b that are not connected to the optical signal input / output unit 1, as in FIG.

FIG. 4 shows that the beam 8c is damaged in such a state. Due to this damage, the girder 8b and the girder 8
c, a gap 6 is formed, and the optical fiber 2b is cut. Therefore, the CPU 22 of the optical signal input / output unit 1
Detects a normal reflected signal in the optical fiber 2a, but cannot detect a normal reflected signal in the optical fiber 2b.

In such a case, the CPU 22 notifies the alarm device 23 that the digits 8a and 8b are normal and the digit 8c is damaged. FIG. 5 shows the processing of the failure detection program executed by the CPU 22. This program is activated when the user presses a failure detection instruction button (not shown) when a disaster such as an earthquake or heavy rain occurs.

When the failure detection program is started, the CP
U22 first transmits an optical signal to the (next) optical fiber (S1). Next, the CPU 22 receives the reflected signal (S2).

Next, the CPU 22 determines whether the amplitude of the reflected signal is equal to or larger than a predetermined value (S3). If the amplitude is less than the predetermined value, the CPU 22 determines that the optical fiber has a fault and stores the fault in the memory 21 (S5).
The control proceeds to the determination of step 6.

On the other hand, if the amplitude is equal to or larger than the predetermined value in the determination of S3, the CPU 22 calculates a time (propagation time) from sending the optical signal to the optical fiber to returning the reflected signal, and within the predetermined value. It is determined whether or not (S4). If the propagation time is less than the predetermined value, the CPU 22 determines that the optical fiber has a fault and stores it in the memory 21 (S5).
The control proceeds to the determination of step 6.

If the propagation time is longer than a predetermined value, the CP
U22 advances the control to the determination of S6 as it is. Next, C
The PU 22 determines whether an unconfirmed optical fiber remains (S6). If an unconfirmed optical fiber remains, the CPU 22 returns the control to the processing of S1, and repeats the processing of S1 to S5 for the remaining optical fibers.

If all optical fibers have been checked (N in S6), the CPU 22 determines whether damage to the optical fibers has been recorded in the memory 21 (S7).

If there is no optical fiber failure, the CPU 22
Ends the processing as it is. On the other hand, when the damage of the optical fiber is recorded in the memory 21 (in the case of Y in the determination of S7), the CPU 22 specifies the damaged part of the bridge girder (S7).
8). In this case, the end position of the longest optical fiber among the optical fibers excluding the optical fiber for which the failure has been confirmed is determined. A normal digit is defined from the digit where the optical signal input / output unit 1 is placed to a digit at the end position of the optical fiber, and a digit portion beyond the end position is a damaged digit.

Next, the CPU 22 determines the damaged portion by the alarm device 2.
3 and an alarm is issued by voice (S9). Next, the CPU 22 waits until the alarm is reset (S1).
0). After the reset, the CPU 22 ends the damage detection processing.

As described above, the bridge monitoring apparatus according to the present embodiment can directly detect damage to a bridge due to damage (for example, cutting) of an optical fiber laid on the bridge. Further, in the fault detection device of the present embodiment, since the detection is simple, the reliability of the detection result is high.

Also, immediately after the occurrence of the fault, the alarm device 23
, A warning is issued, so that the occurrence of a failure can be communicated at an early stage. <Modification> The fault detection device according to the above embodiment has a plurality of optical fibers 2a, 2b, and the like. However, the embodiment of the present invention is not limited to such a configuration. That is, when simply monitoring the presence or absence of a failure, only one optical fiber may be used. Second Embodiment <Structure> A second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a configuration diagram of the bridge monitoring system according to the present embodiment, and FIG. 7 is a diagram illustrating the management device 30 shown in FIG.
6 is a flowchart showing processing of a management program executed by the CPU 32 of FIG. In the first embodiment, the bridge monitoring device including the single optical signal input / output unit 1 has been described. In the present embodiment, a plurality of optical signal input / output units 1
A bridge monitoring system including a, a, and the like and a management device 30 that manages the optical signal input / output units 1a, 1b, and the like will be described. Other configurations and operations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted. The drawings of FIGS. 1 to 5 are referred to as needed.

FIG. 6 is a configuration diagram of the bridge management system according to the present embodiment. This bridge monitoring system includes an optical signal input / output unit 1a, 1b installed on a bridge, optical fibers 2a to 2h laid from an optical signal input / output unit 1a, 1b on a bridge girder, and an optical signal input / output unit 1a. , 1b.

The optical signal input / output sections 1a and 1b do not have the alarm device 23 as compared with the first embodiment. Other configurations and operations are the same as those of the optical signal input / output unit 1 according to the first embodiment, and thus description thereof will be omitted.

The management device 30 includes the optical signal input / output sections 1a, 1
Similarly to b, etc., it includes a memory 31, a CPU 32, and a communication device 34, and further includes an alarm device 33. CPU
32 is an optical signal input / output unit 1a via a communication device 34,
1b, the information at the time of failure occurrence is received. The information at the time of occurrence of the failure includes the optical signal input / output unit 1a or 1a that detected the failure.
ID of b and ID of optical fiber in which fault was detected
It is included.

The CPU 32 estimates a section in which a failure has occurred from the information. The CPU 32 displays the estimated location on the alarm device 33 (electric display panel) as a damaged location of the bridge.
The alarm device 33 includes a speaker (not shown). Under the control of the CPU 22, the alarm device 33 notifies the damaged section by an image and a sound.

The communication device 34 includes the optical signal input / output units 1a, 1
It communicates with the communication device 24 in b, and receives information at the time of failure occurrence. Upon receiving the information, the communication device 34
To transmit the received information. <Method of Identifying Damaged Section> In FIG. 6, the cut optical fibers 2d and the like due to damage to the bridge girder are shown by hatching with parallel oblique lines. In addition, the uncut optical fiber 2
a and the like are indicated by a horizontally long rectangle without hatching.

In FIG. 6, damage has occurred near the center of the bridge, and as a result, the optical fibers 2c, 2d, 2e, 2f,
And 2 g are truncated. On the other hand, the optical fibers 2a, 2
No break occurs in b and 2h. Of these,
The optical fibers 2c and 2d are monitored by the optical signal input / output unit 1a, and the disconnection is detected. In addition, the optical fibers 2e, 2
f and 2g are monitored by the optical signal input / output unit 1b, and disconnection is detected.

In such a case, the identification ID of the optical signal input / output unit 1a and the IDs of the optical fibers 2c and 2d in which a failure has been detected are sent from the optical signal input / output unit 1a to the management device 30.
Is sent. Further, the identification ID of the optical signal input / output unit 1b and the IDs of the optical fibers 2e, 2f, and 2g where the failure has been detected are transmitted from the optical signal input / output unit 1b to the management device 30.

When receiving such information, the CPU 32 of the management device 30 recognizes that the bridge girder has been damaged between the optical signal input / output unit 1a and the optical signal input / output unit 1b. Further, the CPU 32 recognizes that there is no damage to the bridge girder from the optical signal input / output unit 1a to the end of the optical fiber 2b (the longest of the optical fibers in which no cutting has occurred). Further, the CPU 32 recognizes that the bridge girder is damaged from the optical signal input / output unit 1a to the end of the optical fiber 2c.

On the other hand, the CPU 32 has an optical signal input / output unit 1b.
The optical fibers 2e, 2f and 2g laid on the left side of the drawing have an obstacle (the bridge girder is damaged at this point)
Recognize that. As a result, the CPU 32 determines that the bridge girder 8b
And 8c are damaged, and the bridge girders 8a and 8d are determined to be sound. This determination result is displayed on the alarm device 33 as a damaged section (hatched portions 7b and 7c) and a healthy section (sections 7a and 7d without hatching). In addition, a voice alert is issued through a speaker (not shown). <Operation and Effect> FIG. 7 shows processing of the management program executed by the CPU 32 of the management apparatus 30. The CPU 32
Usually, it is in a state of waiting for a damage occurrence notification signal (S1).
0).

When receiving the damage occurrence notification signal via the communication device 34 (Y in S10), the CPU 32 specifies a damaged portion (S11). The damage occurrence notification signal includes an optical signal input / output unit 1a that has detected the disconnection of the optical fiber,
The ID includes an ID such as 1b and the ID of the optical fiber in which the cut is detected. Therefore, the CPU 32 specifies the damaged portion by the procedure described in the method for specifying the damaged section described above.

Next, the CPU 32 identifies the damaged portion with the alarm device 3.
3 (Electronic bulletin board), and further issues an alarm by voice (S12). When the reset button (not shown) is pressed, the CPU 32 returns the control to the processing of S10 (S13).

As described above, in the bridge monitoring system of the present embodiment, a plurality of optical signal input / output units 1a, 1b, etc. are installed at predetermined positions of the bridge, and monitor the failure of the optical fiber connected to each. I do. Further, the management device 30 communicates with each of the optical signal input / output units 1a and 1b, receives the damage occurrence notification signal, and specifies a damaged portion of the bridge. For this reason, even in a long bridge, a damaged portion can be specified in a short time and with high resolution.

Further, in this embodiment, the communication between the optical signal input / output units 1a, 1b and the like and the management device 30 collects the damage occurrence notification signal remotely. For this reason, even if there is a risk of collapse, it is possible to monitor a bridge that avoids the risk. <Modification> In the above embodiment, the IDs of the optical signal input / output units 1a, 1b and the like in which a failure is detected and the IDs of the optical fibers in which the failure is detected are managed from the optical signal input / output units 1a, 1b and the like. Sent to the device 30, the management device 30 specifies the damaged part. However, the embodiment of the present invention is not limited to such a configuration.

For example, the IDs of all the optical signal input / output units 1a and the like and the IDs of sound optical fibers in which no failure is detected are transmitted from the optical signal input / output units 1a and 1b to the management device 30. You may do so.

In each of the optical signal input / output sections 1a, 1b, etc., the monitoring section of the bridge is specified in advance, and the information relating to the monitoring section is totaled by the management device 30, and the alarm device 33
May be displayed. In this case, each optical signal input / output unit 1a,
1b may specify the fault location by the procedure of the first embodiment (the procedure shown in the flowchart of FIG. 5). Then, the management device 30 may notify the overlapping section of those failure positions.

In the above embodiment, the management device 30
Communicates with each of the optical signal input / output units 1a, 1b, etc., receives the damage occurrence notification signal, and specifies the damaged portion of the bridge. The management device 30 includes one of the optical signal input / output units 1a and 1b.
May also serve as the function of the management device 30. An alarm device 33 may be provided in such an optical signal input / output unit 1a, 1b or the like.

In the above embodiment, the failure detection program is activated by the user pressing the failure detection instruction button when an earthquake occurs. However, the embodiment of the present invention is not limited to the startup procedure of the failure detection program. For example, the failure detection program may be activated when an earthquake of a predetermined seismic intensity or higher is observed in conjunction with a seismograph.

Further, the failure detection program may be started at predetermined time intervals by a timer, and periodically monitor the failure (or soundness) of the bridge. In the above embodiment, the reflecting section 3 is composed of an optical coupler (not shown) and a reflecting mirror. However, the practice of the present invention
It is not limited to such a configuration. For example, the reflecting portion 3 may be formed by simply cutting the other end of the optical fiber 2, making its cross section a mirror surface, and applying a reflective material, for example, a paint containing fine metal pieces.

[0061]

As described above, according to the present invention,
Optical fiber allows direct monitoring of bridge continuity. Since the monitoring result is collected via the communication device, a failure in the bridge is detected at an early stage, and the location of the failure is safely specified.

[Brief description of the drawings]

FIG. 1 is a principle diagram (1) of the present invention.

FIG. 2 is a principle diagram (2) of the present invention.

FIG. 3 is a diagram illustrating a hardware configuration of an optical signal input / output unit;

FIG. 4 is a diagram showing an example of application of a bridge monitoring device to a bridge.

FIG. 5 is a flowchart showing processing of a failure detection program;

FIG. 6 is a configuration diagram of a bridge monitoring system according to a second embodiment.

FIG. 7 is a flowchart showing processing of a management program;

FIG. 8 is a diagram showing an optical fiber laying position (1).

FIG. 9 is a view showing an optical fiber laying position (2).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical signal input / output part 2 Optical fiber 3 Reflection part 4 Optical signal 5 Reflection signal 8, 18a, 18b, 18c, 18d, 18e Bridge girder 9 Bridge pier 10 Optical signal drive circuit 11 Light emitting element 12 Light receiving element 1 Optical coupler 21, 31 Memory 22, 32 CPU 23, 33 Alarm device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Eiji Miyamoto 3-2-10 Tsukuda, Chuo-ku, Tokyo F-term in Analysis Technology Service Co., Ltd. (Reference) 2G086 CC01 DD05 5K002 BA21 GA03 5K048 AA15 BA21 DB02 DC08 EB08 FB04 FB11 GB05 HA05 HA07 HA11

Claims (17)

[Claims] An optical fiber laid on a bridge girder connecting a bridge starting point to an end point, a light emitting unit for inputting an optical signal from a connecting end of the optical fiber, and light propagating at the other end of the optical fiber. Reflect the signal,
A reflection unit that generates a reflection signal; a light reception unit that receives the reflection signal at the connection end of the optical fiber; a control unit that controls the light emission unit and the light reception unit; A bridge monitoring device comprising: a notifying unit for notifying a failure of the bridge girder. 2. The bridge according to claim 1, wherein the control section notifies a failure of the bridge girder when the light receiving section does not receive the reflected signal after a predetermined time has elapsed after the light emitting section has input the optical signal. Monitoring device. 3. The bridge monitoring device according to claim 1, wherein the control unit notifies a failure of the bridge girder when the light receiving unit does not receive a reflected signal having a predetermined amplitude or more. 4. A plurality of optical fibers laid from a crossing start point to an end point or a crossing start point to an intermediate point in a bridge girder connecting a crossing start point to an end point of the bridge, and a bridge girder at the crossing start point of the bridge. A light-emitting unit that inputs an optical signal from a connection end of each of the optical fibers; a reflection unit that reflects an optical signal propagated at the other end of each of the optical fibers to generate a reflected signal; A light receiving unit that receives the reflected signal; a control unit that controls the light emitting unit and the light receiving unit to estimate a failure position of a bridge girder; and a reporting unit that reports a failure of the bridge. When the light-receiving unit cannot receive the reflected signal of the optical fiber, the fault of the optical fiber is identified, and the bridge girder beyond the other end of the longest optical fiber among the optical fibers for which no fault has been identified is estimated as the fault location. Apparatus. 5. A bridge monitoring system for detecting a failure of a bridge by certifying a failure of an optical fiber laid on a bridge girder connecting a bridge start point to an end point of the bridge. An optical signal input / output section for connecting and inputting / outputting an optical signal at a connection end of each optical fiber; one or more optical fibers having different lengths connected to the optical signal input / output section; A reflection unit that reflects an optical signal propagated at an end and generates a reflection signal;
The above failure detection device, comprising a management device that manages the failure detection device, the optical signal input and output unit, a light emitting unit that inputs an optical signal from the connection end of each of the optical fibers, and the reflected signal A light receiving unit that receives light, a control unit that controls the light emitting unit and the light receiving unit, and a transmission unit that transmits information according to a command from the control unit,
It is provided at at least one point of a travel starting point, an end point, or a way point from a travel start point to an end point, and divides a bridge girder into one or more monitoring sections, and the optical fiber is connected to each connected optical signal input / output unit. The control unit is laid down to one or more points in the monitoring section, and the control unit recognizes a fault in the optical fiber when the light receiving unit cannot receive a reflected signal of a predetermined condition. Transmitting the information (or the information relating to the monitoring section) and the information relating to the optical fiber for which the failure has been identified or the information relating to the optical fiber for which the failure has not been identified to the management device; And an estimator for estimating the obstacle position of the bridge from the received information, and a notifier for notifying the operator of the fault. The estimator includes a fault detecting device (or Previous A bridge that estimates from the installation position of the optical signal input / output unit in the monitoring section) to the installation range of the longest optical fiber excluding the optical fiber that has been identified as a fault, as a healthy section, and estimates the area beyond the installation area of the optical fiber as a faulty section. Monitoring system. 6. A bridge monitoring system for detecting a failure of a bridge by certifying a failure of an optical fiber laid on a bridge girder connecting a starting point to an end point of a bridge. An optical signal input / output section for connecting and inputting / outputting an optical signal at a connection end of each optical fiber; one or more optical fibers having different lengths connected to the optical signal input / output section; A reflection unit that reflects an optical signal propagated at an end and generates a reflection signal;
The above failure detection device, comprising a management device that manages the failure detection device, the optical signal input and output unit, a light emitting unit that inputs an optical signal from the connection end of each of the optical fibers, and the reflected signal A light receiving unit that receives light, a control unit that controls the light emitting unit and the light receiving unit, and a transmission unit that transmits information according to a command from the control unit,
It is provided at at least one point of a travel starting point, an end point, or a way point from a travel start point to an end point, and divides a bridge girder into one or more monitoring sections, and the optical fiber is connected to each connected optical signal input / output unit. The control unit is laid down to one or more points in the monitoring section, and the control unit, when the light receiving unit cannot receive a reflected signal of a predetermined condition, identifies a failure of the optical fiber, and excludes the optical fiber for which the failure has been identified. The longest optical fiber laying range is regarded as a healthy section, and the area beyond the optical fiber laying range is estimated as a faulty section. The transmitting unit transmits information on the faulty section (or information on a healthy section), The bridge monitoring system, wherein the management device includes a receiving unit that receives information from the transmitting unit, and a reporting unit that reports the received information. 7. The bridge monitoring system according to claim 5, wherein the management device is also used as one of the optical signal input / output units. 8. When a first and a second adjacent fault detecting device, whose optical fibers are laid toward a partner device, notify each other of a pair of faults, the estimating unit sets the first In the failure detection device, the distance beyond the longest optical fiber laying range excluding the optical fiber for which the fault has been recognized is excluded, and the second fault detecting device is far beyond the longest optical fiber laying range except for the optical fiber for which the fault has been recognized in the second fault detection device. The bridge monitoring system according to claim 5, wherein an overlapping section of the bridge is estimated as a failure point. 9. The fault detecting device according to claim 5, wherein the optical fiber is laid from the optical signal input / output unit in both directions of a bridge end point and a bridge start point. Bridge monitoring system. 10. The apparatus according to claim 1, wherein at least two or more of the fault detecting devices are provided, and an optical fiber connected to the first fault detecting device is laid on a left end portion of the bridge with respect to a traveling direction. The optical fiber connected to the detection device is laid on the right side of the bridge with respect to the traveling direction.
The bridge monitoring system according to any one of the above items. 11. A fault detecting device for detecting a fault of an optical fiber laid in a predetermined monitoring section in a bridge girder connecting a bridge starting point to an end point and transmitting information on the bridge fault in the monitoring section. An optical signal input / output unit for connecting one or more optical fibers and inputting / outputting an optical signal at a connection end of each optical fiber, and one or a plurality of different lengths connected to the optical signal input / output unit An optical fiber, and a reflection unit that reflects an optical signal from the optical fiber at the other end of each optical fiber to generate a reflected signal; wherein the optical signal input / output unit is configured to transmit an optical signal from a connection end of each optical fiber. A light receiving unit that receives the reflected signal, a control unit that controls the light emitting unit and the light receiving unit, and a transmitting unit that transmits a notification signal from the control unit. Is the reflection of the predetermined condition When the light receiving unit cannot receive the signal, the optical unit identifies the failure of the optical fiber, and the transmitting unit determines the information related to the failure detection device (or the information related to the monitoring section) and the optical fiber related to the identified failure. A failure detection device that transmits information or information on an optical fiber for which no failure has been identified to a device that manages such information. 12. A bridge management device for receiving information related to a failure of an optical fiber laid on a bridge girder and identifying a failure section of the bridge, a receiving unit receiving failure occurrence information from each of the bridges,
An estimating unit for estimating a fault position of the bridge from the received information, wherein the fault occurrence information includes information for identifying a normal (or abnormal) optical fiber laid on the bridge, The bridge management device estimates a healthy section up to the installation range of the optical fiber excluding the optical fiber in which the abnormality is detected. 13. A fault detecting device for detecting a fault of an optical fiber laid in a predetermined monitoring section in a bridge girder connecting a bridge starting point to an end point and transmitting information on the bridge fault in the monitoring section. An optical signal input / output unit for connecting one or more optical fibers and inputting / outputting an optical signal at a connection end of each optical fiber, and one or a plurality of different lengths connected to the optical signal input / output unit An optical fiber, and a reflection unit that reflects an optical signal from the optical fiber at the other end of each optical fiber to generate a reflected signal; wherein the optical signal input / output unit is configured to transmit an optical signal from a connection end of each optical fiber. A light receiving unit that receives the reflected signal, a control unit that controls the light emitting unit and the light receiving unit, and a transmitting unit that transmits a notification signal from the control unit. Is the reflection of the predetermined condition When the light-receiving part cannot receive the signal, the fault of the optical fiber is identified, and up to the longest optical fiber laying range excluding the faulty optical fiber is regarded as a healthy section, and the fault beyond the laying range of the optical fiber is determined. A failure detection device that estimates a section and transmits the information related to the failed section (or information related to a healthy section) to a device that manages the information. 14. A step of inputting an optical signal from a connection end of an optical fiber laid on a bridge girder connecting a bridge starting point to an end point of the bridge, and connecting the reflected signal generated at the other end of the optical fiber to the connection. A bridge monitoring method comprising: a step of receiving light at an end; and a step of determining a failure of a bridge girder when the light receiving unit cannot receive a reflected signal under a predetermined condition. 15. A step of inputting an optical signal at each connection end of a plurality of optical fibers laid between a bridge start point and an end point of a bridge, and connecting the reflection signal generated at the other end of the optical fiber to the connection point. A bridge monitoring method, comprising: receiving light at an end; transmitting information related to the received reflected signal; collecting the information; and identifying a fault location from the collected information. 16. A step of inputting an optical signal at each connection end of a plurality of optical fibers laid between a bridge start point and a bridge end point, and connecting the reflection signal generated at the other end of the optical fiber to the connection point. Receiving at the end, certifying a failure of the bridge girder when the light receiving unit cannot receive a reflection signal of a predetermined condition, transmitting information on the failure, and collecting information on the failure A bridge monitoring method comprising steps and a step of identifying a location of a fault from collected information. 17. A bridge continuity health monitoring system for estimating a failure of a bridge by certifying a discontinuity of an optical fiber laid on a bridge girder connecting a bridge start point to an end point of the bridge; The above optical fibers are connected, an optical signal input / output unit for inputting / outputting an optical signal at a connection end of each optical fiber, one or a plurality of optical fibers having different lengths connected to the optical signal input / output unit, A reflection unit that reflects an optical signal propagated at the other end of each optical fiber and generates a reflected signal;
The above failure detection device, comprising a management device that manages the failure detection device, the optical signal input and output unit, a light emitting unit that inputs an optical signal from the connection end of each of the optical fibers, and the reflected signal A light receiving unit that receives light, a control unit that controls the light emitting unit and the light receiving unit, and a transmission unit that transmits information according to a command from the control unit,
It is provided at at least one point of a travel starting point, an end point, or a way point from a travel start point to an end point, and divides a bridge girder into one or more monitoring sections, and the optical fiber is connected to each connected optical signal input / output unit. The control unit is laid down to one or more points in the monitoring section, and the control unit recognizes a fault in the optical fiber when the light receiving unit cannot receive a reflected signal of a predetermined condition. The information (or the information on the monitoring section) and the information on the optical fiber for which the failure has been identified or the information on the optical fiber for which the failure has not been identified are transmitted to the management device. A receiving unit that receives the information of the above, an estimating unit that estimates a fault position of the bridge from the received information, and a notifying unit that notifies a fault. The estimating unit includes a fault detecting device (or the fault detecting device) (Visual zone) from the installation position of the optical signal input / output unit to the longest optical fiber laying area excluding the optical fiber that has been identified as a fault, as a healthy section, and a bridge beyond the optical fiber laying area as a fault section. Continuity health monitoring system.