JP3425584B2 - Bridge continuity health monitoring system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention 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 railroads, it is important to detect damage caused by an earthquake or landslide as soon as possible. This is because early detection of damage to bridges and traffic regulation can prevent the occurrence of secondary disasters and take other appropriate measures.

Conventionally, the damage found after an earthquake or heavy rain has been manually checked by site reconnaissance after confirming the scale of the earthquake and observing the state of rainfall. For this reason, the bridges were left as they were until the research personnel arrived at each bridge. Therefore, it may be difficult to prevent secondary disasters immediately after the damage.

Further, even if the investigative staff arrive at each bridge, if the risk of collapse is predicted, the situation of damage may not be accurately investigated. On the other hand, conventionally, as a method of early detecting damage to a bridge, a method of estimating damage to the bridge based on observation data of seismometers and rain gauges installed in the area around the bridge is known. However, this method has a problem in that the estimation result is not reliable because bridge damage cannot be detected directly.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and provides a function of directly monitoring the continuity of a girder indicating the soundness of a bridge. This is a technical issue. As a result, the present invention provides a function of detecting an obstacle in the bridge at an early stage and safely identifying the obstacle.

[0006]

The present invention adopts the following means in order to solve the above problems. That is, the present invention directly monitors bridge continuity through optical fibers.
Then, by detecting the disconnection, the occurrence of the failure and the location of the failure 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 section for inputting an optical signal from a connecting end of the optical fiber, and an optical fiber. A reflecting portion for reflecting the optical signal propagated at the other end of the optical fiber to generate a reflected signal; a light receiving portion for receiving the reflected signal at the connection end of the optical fiber; a control portion for controlling the light emitting portion and the light receiving portion; And a notification unit for notifying a failure of the bridge girder when the reflected signal of the condition cannot be received by the light receiving unit.

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 inputs the optical signal,
You may make it report the obstacle of a bridge girder. Further, the failure of the bridge girder may be notified on condition that the light receiving unit does not receive the reflected signal having a predetermined amplitude or more.

A plurality of such optical fibers may be laid from the starting point to the ending point or from the starting point to the middle point in the bridge girder connecting the starting point to the ending point of the bridge. In that case, when the light receiving part cannot receive the reflected signal of the predetermined condition, 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 that have not been identified as the fault is located at the fault location. Can be estimated as

The present invention is a bridge monitoring system for detecting a failure of a bridge by recognizing a failure of an optical fiber laid on a bridge girder connecting a starting point to an ending point of a bridge, which is one or more optical An optical signal input / output unit that connects fibers and inputs / outputs 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, and each optical fiber It is also possible to provide one or more failure detection devices, each of which has a reflection unit that reflects the optical signal propagated at the other end of the optical path and generates a reflected signal, and a management device that manages the failure detection device.

The optical signal input / output unit includes a light emitting unit for inputting an optical signal from a connection end of each optical fiber, a light receiving unit for receiving a reflected signal, a control unit for controlling the light emitting unit and the light receiving unit, and the control unit. A transmission unit that transmits information according to a command from the department,
The bridge girder is divided into at least one monitoring section, which is provided at at least one of the starting point, the ending point, or an intermediate point from the starting point to the ending point.

The optical fiber is laid from each connected optical signal input / output unit to one or more points in the monitoring section. In addition, the control unit recognizes a failure of the optical fiber when the light receiving unit cannot receive the reflected signal of the predetermined condition, and the transmitting unit detects the information related to the failure detection device (or the information related to the monitoring section). , Information regarding optical fibers for which a failure has been identified or information regarding optical fibers for which no failure has been identified is transmitted to the management device.

Further, the management device has a receiving section for receiving information from the transmitting section, an estimating section for estimating a failure position of the bridge from the received information, and an informing section for informing of the failure. The estimating unit defines a healthy section from the installation position of the optical signal input / output unit in the failure detection device in which the failure has occurred (or the monitoring section) to the installation range of the longest optical fiber excluding the optical fiber certified as the failure, You may make it estimate as a failure area beyond the installation range of the optical fiber.

The control section certifies a failure of the optical fiber when the light receiving section cannot receive a reflected signal of a predetermined condition, and the range up to the longest optical fiber installation range excluding the optical fiber of which the failure is recognized is sound. The section may be estimated to be a section beyond the laying range of the optical fiber as a failure section, and the transmission unit may transmit information related to the failure section (or information related to a healthy section). In this case, the management device may include a receiving unit that receives the information from the transmitting unit and a notification unit that notifies the received information, and may notify the failure section or the sound section.

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

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION 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.

FIGS. 1 and 2 are diagrams for explaining the principle of the bridge monitoring apparatus according to this embodiment, and FIG. 3 is a diagram showing the hardware configuration of the optical signal input / output unit 1 shown in FIG. Yes, FIG. 4 is a diagram showing an example of application of this bridge monitoring device to a bridge, and FIG. 5 is a flow chart showing a process 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 Fault Detection> FIGS. 1 and 2 show the principle of fault detection. As shown in FIGS. 1 and 2, the failure detection apparatus according to the present embodiment is provided with 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 reflector 3 that reflects the 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 the bridge. Figure 1
In the normal state as described above, 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 reflector 3 is composed of an optical coupler (not shown) and a reflecting mirror. The optical signal 4 reaching the reflecting unit 3 is reflected by the reflecting mirror via the optical coupler. The reflected signal 5 generated at this time is input to the optical fiber 2 again 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 that depends on the loss in the optical fiber 2 and the reflection coefficient in the reflection unit 3.

On the other hand, if damage to the bridge occurs, especially if a failure that impairs the continuity of the bridge girders that make up the bridge occurs,
The optical fiber 2 laid on the bridge is also cut. Figure 2
The 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. 1,
This optical signal 4 does not reach the reflecting section 3.

In this case, depending on the state of the cutting point 6,
The reflected signal 5a can be generated. However, the optical signal input / output unit 1
The distance from to the cut point 6 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 the case of FIG. Further, the reflected signal at the cut portion is weaker than the reflected signal at the reflecting portion 3. Therefore, when the attenuation in the optical fiber 2 is small, the amplitude of the reflected signal 5a generated at the cut portion 6 is smaller than the amplitude of the reflected signal 5 by the reflecting portion 3.

Therefore, by monitoring the time delay or the amplitude of the reflected signal 5 in the optical signal input / output unit 1,
It is possible to detect cutting of the optical fiber 2 and damage to the bridge.
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 bridge piers 9 are arranged in a direction that traverses the river 100 with respect to a river 100 that flows in the left-right direction in the drawing, and these bridge piers 9 are connected to each other by bridge girders 8. FIG. 8 shows a state in which the bridge girder 8 has moved due to an earthquake and the bridge has curved. Optical fibers 2a and 2b are laid on both sides of the bridge girder.

When the bridge girder 8 moves due to an earthquake and the bridge bends in the horizontal plane, the optical fiber laid inside the curved bridge is not cut, but the optical fiber laid outside the curved bridge is cut. Is likely to occur (cut point 6 in FIG. 8). Therefore, if 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 becomes high.

As shown in FIG. 9, when a plurality of bridge girders 18a, 18b, 18c, 18d are installed side by side between two piers 9, the outer side of the outermost bridge girder 8a and the outer side of 8d. It is preferable to install the optical fibers 2a and 2b in the. <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 an optical fiber 2, and an optical coupler 13 for inputting / outputting an optical signal to / from the optical fiber 2 and a light emitting device for inputting 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 that executes a program and provides a function as the optical signal input / output unit 1.
A U22, an alarm device 23 that is controlled by the CPU 22 and that issues an alarm when a bridge damage is detected, and a communication device 24 that wirelessly transmits / receives data during communication with a host computer (not shown).

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

The light emitting element 11 is supplied with power from the optical signal drive circuit 10 and generates laser light having an extremely narrow radiation angle range. The laser light is incident on 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 through the optical coupler 13, the light receiving element 12 converts the received 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 laser light. Further, the optical signal driving circuit 10 A / D converts the electric signal output from the light receiving element 12 and transmits the A / D converted signal to the CPU 22.

The memory 21 records programs executed by the CPU 22 and data processed by the CPU 22. C
The PU 22 executes the 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 the optical fiber 2
An optical signal (laser) is incident on. 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.

Further, the CPU 22 analyzes the reflected signal from the optical fiber 2 to determine whether or not a failure has occurred. When a failure occurs, the CPU 22 issues an alarm via the alarm device 23.

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

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 girder 8a located on the leftmost side). 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 beam 8a to the beam 8b. Further, the optical fiber 2b is similarly laid over the girder 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 girder 8c is damaged in such a state. Due to this damage, girder 8b and girder 8
A gap 6 is formed between the optical fiber 2c and the optical fiber c, and the optical fiber 2b is cut. Therefore, the CPU 22 of the optical signal input / output unit 1
Detects a normal reflection signal in the optical fiber 2a, but cannot detect a normal reflection 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 digits 8c are damaged. FIG. 5 shows the processing of the failure detection program executed by the CPU 22. This program is started when the user presses a failure detection instruction button (not shown) when a disaster such as an earthquake or heavy rain occurs.

When the fault detection program is activated, the CP
The U22 first sends an optical signal to the (next) optical fiber (S1). Next, the CPU 22 receives the reflected signal (S2).

Next, the CPU 22 determines whether or not the amplitude of the reflected signal is not less than a predetermined value (S3). If the amplitude is less than the predetermined value, the CPU 22 determines that the optical fiber has a failure, and stores it in the memory 21 (S5).
Control is advanced to the judgment of 6.

On the other hand, if the amplitude is greater than or equal to the predetermined value in the determination of S3, the CPU 22 calculates the time from the transmission of the optical signal to the optical fiber until the return of the reflected signal (propagation time), 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 failure and stores it in the memory 21 (S5).
Control is advanced to the judgment of 6.

When the propagation time is a predetermined value or more, CP
U22 directly advances the control to the determination of S6. Then C
The PU 22 determines whether or not an unidentified optical fiber remains (S6). When the unconfirmed optical fiber remains, the CPU 22 returns the control to the process of S1 and repeats the processes of S1 to S5 for the remaining optical fibers.

When the confirmation of all the optical fibers is completed (N in the determination of S6), the CPU 22 determines whether the damage of the optical fibers is recorded in the memory 21 (S7).

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

Next, the CPU 22 informs the alarm device 2 of the damaged portion.
No. 3 is displayed and a voice alarm is issued (S9). Next, the CPU 22 waits until the alarm is reset (S1
0). After the reset, the CPU 22 ends the damage detection process.

As described above, in the bridge monitoring apparatus according to the present embodiment, the damage of the bridge can be directly detected by the damage (for example, cutting) of the optical fiber laid on the bridge. Further, in the fault detection device of the present embodiment, the detection result is simple, and therefore the reliability of the detection result is high.

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

FIG. 6 is a block diagram of the bridge management system according to this embodiment. This bridge monitoring system includes optical signal input / output units 1a and 1b installed on a bridge, optical signal input / output units 1a and 1b to optical fibers 2a to 2h installed on a bridge girder, and an optical signal input / output unit 1a. And a management device 30 that manages 1b.

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

The management device 30 includes the optical signal input / output units 1a and 1a.
Similar to b and the like, 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 the communication device 34,
1b receives information when a failure occurs. The information at the time of failure includes the optical signal input / output unit 1a or 1 that detected the failure.
b ID and optical fiber ID in which the fault is detected
It is included.

The CPU 32 estimates a fault occurrence section from the information. The CPU 32 displays the estimated location on the alarm device 33 (electrical display board) 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 image and sound.

The communication device 34 includes optical signal input / output units 1a, 1a.
It communicates with the communication device 24 in b and receives information when a failure occurs. Upon receiving the information, the communication device 34 causes the CPU 32 to
An interrupt signal is sent to and the received information is transmitted. <Method of Identifying Damaged Section> In FIG. 6, the optical fiber 2d and the like cut along with the damage to the bridge girder are shown by hatching with parallel diagonal lines. Also, the uncut optical fiber 2
The letters a and the like are shown as horizontally long rectangles 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 cut. On the other hand, the optical fibers 2a, 2
No cleavage 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. Also, 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 optical signal input / output unit 1a sends to the management device 30 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 is detected.
Will be sent. Further, the optical signal input / output unit 1b transmits the identification ID of the optical signal input / output unit 1b and the IDs of the optical fibers 2e, 2f, and 2g in which a failure is detected to the management device 30.

Upon receiving such information, the CPU 32 of the management device 30 recognizes that the bridge girder is 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 one of the optical fibers that has not been cut). Further, the CPU 32 recognizes that the bridge girder is damaged beyond the end of the optical fiber 2c from the optical signal input / output unit 1a.

On the other hand, the CPU 32 uses the optical signal input / output section 1b.
The optical fibers 2e, 2f, and 2g laid on the left side of the drawing have obstacles (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. The determination result is displayed in the alarm device 33 by a damaged section (hatched portions 7b and 7c) and a sound section (sections 7a and 7d without hatching). Also, a voice warning is issued through a speaker (not shown). <Operation and Effect> FIG. 7 shows the processing of the management program executed by the CPU 32 of the management device 30. CPU 32
Normally, it is in a state of waiting for a damage occurrence notification signal (S1
0).

When the CPU 32 receives the damage occurrence notification signal via the communication device 34 (Y in S10), the CPU 32 identifies the damaged portion (S11). The damage occurrence notification signal includes an optical signal input / output unit 1a that detects a break in the optical fiber,
The IDs such as 1b and the IDs of the optical fibers whose disconnection is detected are included. Therefore, the CPU 32 identifies the damaged portion by the procedure described in the method of identifying the damaged section described above.

Next, the CPU 32 notifies the alarm device 3 of the damaged portion.
3 (electronic bulletin board), and a voice alarm is issued (S12). When the reset button (not shown) is pressed, the CPU 32 returns the control to the process of S10 (S13).

As described above, in the bridge monitoring system according to the present embodiment, a plurality of optical signal input / output units 1a, 1b, etc. are installed at predetermined positions on the bridge and the failure of the optical fiber connected to each is monitored. To do. Further, the management device 30 communicates with each of the optical signal input / output units 1a, 1b, etc., receives the damage occurrence notification signal, and identifies the damaged portion of the bridge. Therefore, even in a long bridge, a damaged portion can be identified in a short time with high resolution.

Further, in this embodiment, the damage occurrence notification signal is remotely collected by the communication between the optical signal input / output units 1a, 1b and the like and the management device 30. Therefore, even if there is a risk of collapse, it is possible to monitor the bridge while avoiding the risk. <Modification> In the above-described 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. The information is transmitted to the device 30, and the management device 30 identifies the damaged portion. However, the implementation of the present invention is not limited to such a configuration.

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

Further, in each of the optical signal input / output sections 1a, 1b, etc., the monitoring section of the bridge is specified in advance, and the management device 30 collects information on the monitoring section, and the alarm device 33 is provided.
May be displayed in. In this case, each optical signal input / output unit 1a,
1b may identify the failure position 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 the 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 is provided with one of the optical signal input / output units 1a and 1b.
Etc. may also have the function of the management device 30. The optical signal input / output units 1a, 1b and the like may be provided with the alarm device 33.

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

The fault detection program may be activated by a timer at predetermined time intervals to regularly monitor the fault (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 invention is
The configuration is not limited to this. For example, the reflecting portion 3 may be formed by simply cutting the other end of the optical fiber 2, making the cross-section into a mirror surface state, and then applying a reflecting material, for example, a coating material containing fine metal pieces.

[0061]

As described above, according to the present invention,
Optical fibers allow direct monitoring of bridge continuity. Since the monitoring results are collected via the communication device, the obstacle in the bridge is detected early and the fault location is safely specified.

[Brief description of drawings]

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

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

FIG. 3 is a diagram showing 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 the processing of the fault detection program.

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

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

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

FIG. 9 is a diagram showing the laying position of the optical fiber (2)

[Explanation of symbols]

1 Optical signal input / output section 2 optical fiber 3 Reflector 4 Optical signal 5 Reflected signal 8, 18a, 18b, 18c, 18d, 18e Bridge girder 9 piers 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

Front page continuation (72) Inventor Eiji Miyamoto 3-10 Tsukuda, Chuo-ku, Tokyo Within the analysis technology service of a stock company (56) Reference JP 10-197298 (JP, A) JP 7- 27871 (JP, A) JP 56-30610 (JP, A) JP 2000-39309 (JP, A) JP 2001-99754 (JP, A) Fukukaihei 6-49961 (JP, U) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) G01M 11/00-11/02 G01J 1/00-1/02 G01J 1/42 G01V 8/12 G01B 11/16 G01C 7/06 G01D 5/26 G01D 21/00 G01M 19/00 G02B 6/00 G08C 25/00 E02D 17/20 106 H04B 1/60 H04B 3/46-3/48 H04B 10/08 H04B 17/00-17/02 H04Q 9/00 301

Claims (4)

(57) [Claims] 1. A bridge continuity health monitoring system for detecting a failure of a bridge by recognizing a failure of an optical fiber laid on a bridge girder that connects a starting point to an ending point of a bridge , An optical signal or an optical signal input / output unit that connects multiple optical fibers in parallel and inputs and outputs optical signals at the connection end of each optical fiber, and a single unit connected to this optical signal input / output unit.
Connect one optical fiber or this optical signal input / output unit in parallel.
A plurality of consecutive optical fibers having different lengths, and two fault detection devices each including a reflection unit configured to reflect an optical signal propagated at the other end of each optical fiber to generate a reflected signal; A management device for managing, wherein the optical signal input / output unit includes a light emitting unit for inputting an optical signal from a connection end of each optical fiber, a light receiving unit for receiving the reflected signal, the light emitting unit and the light receiving unit. The optical signal input / output unit is provided at a transit start point and an end point, and the optical fiber is connected to each optical fiber. It is laid from the signal input / output unit to one or more points on the bridge girder, the control unit recognizes a failure of the optical fiber when the light receiving unit cannot receive the reflected signal of the predetermined condition, and the transmitting unit, Information related to the failure detection device And information relating to an optical fiber for which a fault has been identified or information regarding an optical fiber for which a fault has not been identified, and the managing device receives the information from the transmitting unit, and a receiving unit that receives the information. The first and second fault detection devices, each having an estimation unit that estimates the obstacle position of the bridge from the information obtained and a notification unit that notifies the obstacle, and whose optical fibers are laid toward each other When the notification is made, the estimation unit determines that the first fault detection device has a fault beyond the longest optical fiber laying range excluding the fault-recognized optical fiber and the second fault detection device has determined a fault. A bridge continuity health monitoring system that estimates, as an obstacle, an overlapping section beyond the installation range of the longest optical fiber excluding the optical fiber. 2. A bridge continuity health monitoring system for detecting a failure of a bridge by recognizing a failure of an optical fiber laid on a bridge girder that connects a starting point to an ending point of a bridge . An optical signal or an optical signal input / output unit that connects multiple optical fibers in parallel and inputs and outputs optical signals at the connection end of each optical fiber, and a single unit connected to this optical signal input / output unit.
Connect one optical fiber or this optical signal input / output unit in parallel.
A plurality of failure detection devices consisting of a plurality of continuous optical fibers having different lengths, and a reflection unit that reflects the optical signal propagated at the other end of each optical fiber and generates a reflection signal, and the failure detection device. A management device for managing, wherein the optical signal input / output unit includes a light emitting unit for inputting an optical signal from a connection end of each optical fiber, a light receiving unit for receiving the reflected signal, the light emitting unit and the light receiving unit. The optical signal input / output unit is provided at a transit start point, an end point, or a midway point from the transit start point to the end point. The bridge girder is divided into one or more monitoring sections, the optical fiber is laid from each connected optical signal input / output section to one or more points in the monitoring section, and the control section is configured to reflect a predetermined condition. When the light receiving part cannot receive a signal The failure of the optical fiber is recognized, and the transmitting unit determines information related to the failure detection device (or information related to the monitoring section) and information related to the optical fiber for which the failure is recognized or an optical fiber for which the failure is not recognized. The relevant information is transmitted to the management device, and the management device receives the information from the transmission unit, an estimation unit that estimates the obstacle position of the bridge from the received information, and a notification unit that notifies the obstacle. When the first and second adjacent fault detection devices whose optical fibers are laid toward the partner device notify each other of the fault, the estimation unit causes the first fault detection device to Except for the installation range of the longest optical fiber excluding the optical fiber certified as a fault, and for the installation range of the longest optical fiber excluding the optical fiber certified as a fault in the second fault detection device A bridge continuity health monitoring system that estimates overlapping sections of roads as obstacles. 3. The bridge continuity health monitoring system according to claim 1, wherein the management device is also used as one of the optical signal input / output units. 4. The bridge continuity health according to claim 2 or 3, wherein the obstacle detection device has optical fibers laid in both directions from the optical signal input / output unit to the passage end point direction and the passage start point direction of the bridge. Monitoring system.