JP5083809B2 - Optical fiber disconnection type impact detection device and bridge girder collision detection method using the same - Google Patents

Description

  The present invention relates to an optical fiber disconnection type impact detection device for detecting an impact received by a detection object such as an overpass or an overpass and a bridge girder collision detection method using the same.

  Conventionally, a car that has exceeded the ceiling height under the girder has collided with a bridge girder of an overpass. For this reason, a protective girder is installed in front of the bridge girder to prevent the car from colliding with the bridge girder. However, even if the guard girder is installed, there is an accident in which the car breaks through the guard girder and collides with the bridge girder.

  In the event of a collision between the bridge girder and the vehicle, the management company of the overpass will be notified of the collision by the driver or police. As a result, the management company sends the employee to the accident site and causes the employee to confirm the safety of the bridge. The management company prohibits the train from crossing the road bridge until the safety of the road bridge is confirmed.

  As described above, the employees of the above management company confirm the safety of the overpass on the road heading toward the overpass after receiving the notification of the collision accident. For this reason, the time from the occurrence of the collision accident to the safety confirmation of the bridge girder becomes long. In this case, since the train cannot cross the overpass for a long time, it is required to shorten the time from the occurrence of the collision accident to the safety confirmation of the overpass.

  When responding to the above request, for example, a method of installing an impact measurement device disclosed in Japanese Patent Application Laid-Open No. 2000-79839 (Patent Document 1) on a bridge girder of an overhead bridge can be considered. This impact measuring apparatus measures the impact applied to the measurement object based on the acceleration detected by the acceleration sensor.

  However, the impact measuring device cannot reliably detect that an impact that threatens the safety of the bridge, that is, a harmful impact is applied to the detection target.

  More specifically, when the impact applied to the bridge bridge is detected by an impact measuring device, the acceleration sensor is attached to the bridge girder, but if the acceleration sensor is close to the collision point of the car, the impact applied to the bridge girder is small. However, the acceleration sensor detects a large acceleration. As a result, even if the impact is a harmless impact (impact that does not threaten the safety of the overhead bridge), it is measured as a harmful impact (impact that threatens the safety of the overhead bridge).

On the contrary, if the acceleration sensor is far from the collision point of the car, the acceleration sensor can detect only a small acceleration even if the impact applied to the bridge girder is large. As a result, even if the impact is a harmful impact, it is measured as a harmless impact.
JP 2000-79839 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide an optical fiber disconnection type impact detection device capable of reliably detecting that a harmful impact has been applied to an object to be detected, and a bridge girder collision detection method using the same.

In order to solve the above problems, an optical fiber broken impact detection device of the present invention is
A steel protection tube,
An optical fiber inserted into the protective tube;
The optical fiber is inserted into the protective tube and has an inner diameter larger than the outer diameter of the optical fiber so that there is a gap with a part of the outer peripheral surface of the optical fiber. And a coil capable of cutting the optical fiber.

  According to the above-configured optical fiber broken impact detection device, the protective tube is attached to the detection target. Then, an optical signal is supplied to one end of the optical fiber inserted into the protective tube, and the optical signal emitted from the other end of the optical fiber is monitored.

  When an impact harmful to the detection object is applied to the protective tube, the protective tube is crushed and the inner surface of the protective tube presses the coil against the optical fiber. As a result, the coil pushes through the optical fiber, and the optical signal emitted from the other end of the optical fiber changes.

  On the other hand, when a harmless impact is applied to the detection target, the protective tube is not crushed or slightly recessed, and the inner surface of the protective tube does not press the coil against the optical fiber. For this reason, the coil does not push through the optical fiber, and the optical signal emitted from the other end of the optical fiber does not change.

  In this way, if an impact that is harmful to the detection object is applied to the protective tube, the optical fiber is disconnected and the optical signal that is output from the other end of the optical fiber is changed, so that the harmful impact is applied to the bridge. Can be detected reliably.

  In addition, for example, even if lightning falls on the detection target, the optical signal in the optical fiber is hardly affected by the lightning, so that it is possible to increase resistance to disaster.

  Further, since the optical fiber is inserted into the protective tube and covered with the protective tube, it can be prevented from being cut by mischief. Therefore, it is possible to increase the reliability of the detection result obtained by the optical fiber breakage type impact detection device.

  The “poisonous impact” refers to an impact that prevents the detection target from fulfilling its original purpose. For example, when the object to be detected is a bridge girder of an overpass, the “harmful impact” refers to an impact that causes a situation in which the bridge girder is deformed and the train cannot safely cross the overpass.

  Therefore, the magnitude of the “harmful impact” is determined depending on what the detection target is, and naturally, the magnitude of the “harmful impact” changes when the detection target changes.

  Moreover, even if the magnitude of the “harmful impact” changes, it can be dealt with by changing the thickness or material of the protective tube.

In the optical fiber broken impact detector of one embodiment,
The optical fiber is bent in a U shape and inserted through the protective tube,
The U-shaped bent portion of the optical fiber is outside the protective tube.

  According to the optical fiber broken impact detection device of the above embodiment, the optical fiber is bent into a U shape and inserted into a protective tube, and the portion of the optical fiber bent into a U shape is outside the protective tube. Since it has come out, since two linear parts of the optical fiber face each other in the protective tube, the optical fiber is easily cut by the coil.

  Therefore, when an impact harmful to the detection target is applied to the protective tube and the protective tube is crushed, there is a high possibility that the optical fiber is disconnected, and the reliability of detection of the harmful impact can be increased.

The collision detection method of the bridge girder of the present invention is
The protective tube of the optical fiber broken impact detection device of the present invention is attached to a bridge girder, and the collision of the bridge girder is detected based on the output of the optical fiber broken impact detection device.

  According to the collision detection method of the bridge girder of the above configuration, the protection tube of the optical fiber breakage type impact detection device is attached to the bridge girder, and the collision of the bridge girder is detected based on the output of the optical fiber breakage type impact detection device. It is possible to reliably detect a collision that has a harmful impact on the bridge girder.

In the bridge girder collision detection method of one embodiment,
A photoelectric sensor is attached to a protective girder that is installed on a road that crosses the bridge girder and faces the bridge girder. Is detected.

  According to the collision detection method of the bridge girder of the above embodiment, a photoelectric sensor is attached to a protective girder that is installed on a road that crosses the bridge girder and faces the bridge girder, and the output of the photoelectric sensor and the optical fiber broken impact detection device Since the collision of the bridge girder is detected based on the output, it is possible to reduce false detections regarding the collision of the bridge girder.

  According to the optical fiber disconnection type impact detection device of the present invention, the coil is inserted into the protective tube and the optical fiber is inserted into the coil, and this coil can cut the optical fiber. If an impact that is harmful to the protective tube is applied to the protective tube, the protective tube is crushed, the coil pushes through the optical fiber, and the optical fiber does not transmit the optical signal.

  Therefore, it is possible to reliably detect whether or not a harmful impact has been applied to the detection object by attaching the protective tube to the detection object and monitoring the transmission state of the optical signal in the optical fiber.

  In the collision detection method of the bridge girder according to the present invention, the protective pipe of the above-mentioned optical fiber broken impact detection device is attached to the bridge girder, and the collision of the bridge girder is detected based on the output of the optical fiber broken impact detection device. It is possible to reliably detect a collision that causes a harmful impact.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described in detail with reference to an optical fiber breakage type impact detection device and a bridge girder collision detection method using the same.

  FIG. 1 is a schematic diagram showing a schematic configuration of the above-described optical fiber broken impact detection apparatus 100.

  The optical fiber broken impact detection device 100 includes a steel protective tube 1, a POF (plastic optical fiber) 2 inserted through the protective tube 1, and a POF 2 inside the protective tube 1. And a coil 3 capable of cutting the POF 2.

  The POF 2 is bent into a U shape and is inserted into the protective tube 1. Two linear portions of the POF 2 are inserted into the coil 3. The two linear portions of the POF 2 face each other in the radial direction.

  An optical signal emitted from the light emitting element 4 enters one end of the POF 2. This optical signal is guided by the POF 2 and enters the light receiving element 5 from the other end of the POF 2.

  Although not shown, the portion of the POF 2 bent into a U shape is inserted into a PF (Plastic Flexible conduit) tube whose one end is closed to be protected.

  When the collision of the bridge girder 101 of the overhead bridge shown in FIG. 2 is detected using the optical fiber broken impact detection device 100 having the above configuration, the protective tube 1 is attached to the flange portion of the bridge girder 101. Then, an optical signal is supplied from the light emitting element 4 to one end of the POF 2, and an optical signal output from the other end of the POF 2 is incident on the light receiving element 5. The light emitting element 4 and the light receiving element 5 are accommodated in the disconnection detecting device 6, and the disconnection detecting device 6 detects the disconnection of the POF 2 based on the output of the light receiving element 5.

  As shown in FIG. 3, when the load 104 of the car 103 that is about to pass under the bridge girder 101 collides with the bridge girder 101, if the impact caused by this collision is harmful to the bridge girder 101, the protective tube 1 is crushed. The inner surface of the protective tube 1 presses the coil 3 against the POF 2. As a result, the POF 2 is pushed by the coil 3 and disconnected, so that no optical signal enters the light receiving element 5.

  On the other hand, if the impact by the load 104 is harmless to the bridge girder 101, the protective tube 1 is not crushed or slightly deformed. In this case, the POF 2 is not disconnected, and an optical signal enters the light receiving element 5.

  As described above, if the impact due to the load 104 is harmful to the bridge girder 101, the POF 2 is disconnected and the optical signal is not incident on the light receiving element 5, so that the harmful impact is applied to the bridge girder 101. It can be detected reliably.

  Further, for example, even if lightning falls on an overpass, the optical signal in the POF 2 is hardly affected by lightning, so that it is possible to increase resistance to disaster.

  In addition, since most of the POF 2 is covered with the protective tube 1 and the PF tube, it can be prevented from being cut by mischief. Therefore, it is possible to increase the reliability of the detection result obtained by the optical fiber breakage impact detection apparatus 100.

  The POF 2 is bent in a U shape and inserted through the protective tube 1, and the U-shaped POF 2 portion is inserted into the coil 3, so the U-shaped POF 2 portion is the coil 3. Easy to cut by. Therefore, when an impact harmful to the bridge girder 101 is applied to the protective tube 1 and the protective tube 1 is crushed, there is a high possibility that the POF 2 is disconnected. For example, even if one of the two straight portions in the U-shaped POF 2 portion is not cut by the coil 3, the other of the two two straight portions can be cut by the coil 3. Therefore, the certainty of the detection of the harmful impact can be increased.

  When the bridge girder 101 receives a harmful impact, as shown in FIG. 2, the disconnection detection device 6 sends a signal to the special signal light emitter 102 beside the track. As a result, the special signal light emitter 102 emits a stop signal, and passage of the overhead bridge is prohibited. In this case, the special signal light emitter 102 can emit a stop signal in a short time after the bridge girder 101 receives a harmful impact. Therefore, it is possible to prevent the train from entering the unsafe overpass. That is, the occurrence of a secondary disaster can be prevented.

  In the above embodiment, the POF 2 is bent in a U shape and inserted into the protective tube 1. However, the POF 2 may be bent in a U shape and only a part of the POF 2 is inserted into the protective tube 1.

  In the above embodiment, the POF 2 is inserted into the protective tube 1, but a GOF (glass optical fiber) may be inserted or inserted into the protective tube 1.

  In the above embodiment, one POF 2 bent into the U-shape is inserted into the protective tube 1, but a plurality of linear POFs or GOFs that are not bent into the U-shape are inserted into the protective tube 1. Or you may insert.

  In the above embodiment, the collision of the bridge girder 101 is detected based only on the output of the optical fiber broken impact detection device 100. However, as shown in FIG. The collision of the bridge girder 601 may be detected based on the outputs of the 200 and the monitoring camera 300.

  More specifically, the protective tube 1 (see FIG. 1) of the optical fiber broken impact detector 100 is attached to the bridge girder 601 of the overhead bridge 600, the photoelectric sensor 200 is attached to the guard girder 800, and the surveillance camera 300 is connected to the bridge girder 601. And close to each of the guard girder 800.

  Two monitoring cameras 300 are installed on the upstream side of the road bridge 600. One monitoring camera 300 photographs the upstream bridge girder 601 and the other monitoring camera 300 photographs the upstream protection girder 800. Yes. Also, two monitoring cameras 300 are installed on the downstream side of the bridge 600, and one monitoring camera 300 photographs the downstream bridge girder 601 and the other monitoring camera 300 downstream the guard girder. I'm shooting 800.

  The guard girder 800 is installed on a road 700 that intersects the bridge girder 601 so as to face the bridge girder 601.

  Information from the above-mentioned optical fiber break type impact detection device 100, photoelectric sensor 200 and monitoring camera 300 is sent to the monitoring panel 500, and is sent from the monitoring panel 500 to the management company of the overhead bridge via the existing communication network. .

  Therefore, the employees of the management company can accurately grasp the state of the bridge girder 601 based on the information from the optical fiber broken impact detection device 100, the photoelectric sensor 200, and the monitoring camera 300 without going to the bridge 600. can do. That is, erroneous detection related to the collision of the bridge girder 601 can be reduced.

  In addition, since the employees of the management company can accurately grasp the state of the bridge girder 601, it is possible to avoid a situation where traffic on the bridge girder 601 is prohibited even though the impact applied to the bridge girder 601 is harmless. be able to.

  As described above, the optical fiber disconnection type impact detection device of the present invention can be used to reliably detect that the overhead bridge has received a harmful impact. The application is not limited to the impact detection of a road bridge. For example, the optical fiber disconnection type impact detection device of the present invention can detect a falling car if it is attached to the side wall of an overpass, can detect a falling rock if it is installed in a place where there is a risk of falling rocks, and guardrails, utility poles and signs. If it is attached to the door, it is possible to detect destruction of guardrails, utility poles, signs, etc.

FIG. 1 is a schematic diagram of a schematic configuration of an optical fiber broken impact detection device according to an embodiment of the present invention. FIG. 2 is a schematic diagram for explaining a collision detection method of a bridge girder using the above-described optical fiber broken impact detection device. FIG. 3 is a schematic diagram for explaining a collision detection method of a bridge girder using the above-described optical fiber broken impact detection device. FIG. 4 is a schematic diagram for explaining another method for detecting collision of a bridge girder using the above-mentioned optical fiber broken impact detection device.

1 Piping 2 POF
3 Coil 101,601 Bridge girder 200 Protective girder

Claims (4)

A steel protection tube,
An optical fiber inserted into the protective tube;
The optical fiber is inserted into the protective tube and has an inner diameter larger than the outer diameter of the optical fiber so that there is a gap with a part of the outer peripheral surface of the optical fiber. An optical fiber disconnection type impact detection device comprising: a coil capable of cutting the optical fiber. In the optical fiber broken impact detection device according to claim 1,
The optical fiber is bent in a U shape and inserted through the protective tube,
A portion of the optical fiber bent in a U shape protrudes outside the protective tube.   The protective tube of the optical fiber broken impact detection device according to claim 1 or 2 is attached to a bridge girder, and the collision of the bridge girder is detected based on the output of the optical fiber broken impact detection device. How to detect collision of bridge girder In the collision detection method of the bridge girder of Claim 3,
A photoelectric sensor is attached to a protective girder that is installed on a road that crosses the bridge girder and faces the bridge girder. A collision detection method for a bridge girder characterized by detecting

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