JP4800814B2 - Earth and sand disaster monitoring system - Google Patents

Description

  The present invention relates to a landslide disaster monitoring facility that detects rockfall, slope failure, landslide, and the like.

  Japan's land transportation network runs in various terrain along the coast and mountains. In particular, in areas that run along slopes, safety measures such as rockfall protection nets, fences, and slope protection work have been implemented on slopes for the purpose of operational safety management. Comprehensive monitoring is carried out by monitoring equipment.

  Conventional disaster monitoring facilities are not only disaster monitoring facilities (for example, refer to Patent Document 1) that exchange signals from sensors to alarm management devices, but also wireless disaster monitoring facilities that use specific low-power radio. .

  A conventional earth and sand disaster monitoring facility, which is an example of a disaster monitoring facility, will be described with reference to FIG.

  When a protective fence or a protective net 51 is installed on a slope adjacent to a traffic road such as a railroad, a fall sensor (or vibration sensor) 52 is attached to the protective fence or protective net 51. When the protective fence or the protective net 51 is tilted or falls due to falling rocks, the falling sensor 52 operates to transmit the detection of falling rocks to the transmitter 53 by wire. The transmitter 53 transmits the falling rock detection signal to the receiving device 54 installed outside the detection range by high frequency electromagnetic waves. Alternatively, the water pressure gauge 55 is installed in the ground of a slope where landslide is expected. The transmitter 56 transmits the data of the water pressure gauge 55 to the receiving device 54 installed outside the detection range using high-frequency electromagnetic waves. The receiving device 54 transmits the received signal to the management center or the management office by wired or high-frequency electromagnetic waves.

  When a large-scale rockfall occurs in the wired earth and sand disaster monitoring facility as described above, the cable connecting the sensor 52 and the transmitter 53 may be disconnected, and the scale of the disaster may not be accurately grasped. On the other hand, radio-type earth and sand disaster monitoring equipment using high-frequency electromagnetic waves is not reliable as a disaster monitoring system because electromagnetic waves are scattered and attenuated by heavy fog and heavy rain that triggers disasters.

Japanese Patent Laid-Open No. 8-13505

  As described above, in a conventional disaster monitoring facility, in the case of a wired type disaster monitoring facility, there is a possibility that the cable may be disconnected or damaged due to slope collapse or landslide. On the other hand, radio-type disaster monitoring equipment uses high-frequency electromagnetic waves, and radio waves are attenuated due to the trees buried in the transmission line, snowfall, dense fog, or collapsed earth and sand, and communication becomes impossible. there is a possibility. As described above, both of them may not be able to satisfy the function as a disaster monitoring facility.

  An object of the present invention is to provide a landslide disaster monitoring system that does not break by using a low-frequency magnetic field signal for signal exchange and that is not subject to restrictions on the natural environment in order to solve the above-described problems. is there.

  According to the present invention, a sensor that detects a change in the installation posture and generates a trigger signal, a transmitter that transmits a low-frequency magnetic field signal using the trigger signal from the sensor, and a low-frequency signal transmitted from the transmitter. A detection device including a transmission antenna that transmits a high frequency magnetic field signal, a reception antenna that receives a low frequency magnetic field signal from the detection device, and a reception processing device that receives a reception signal of the reception antenna and transmits an alarm Thus, a landslide disaster monitoring system is provided in which one or more detection devices are installed or buried on a slope or the like, and a warning is transmitted by detecting a change or collapse of the slope.

  Therefore, since a low-frequency magnetic field signal that is not disconnected and is not affected by the signal propagation medium is used, it is possible to provide a sediment disaster monitoring system that is not restricted by the natural environment.

  According to the present invention, a plurality of the detection devices are installed or embedded in the measurement target range, while the reception antenna is installed outside the measurement target range, and each detection device is further connected to the transmitter from the transmitter. A modulation circuit for superimposing an ID unique to the detection device on the frequency magnetic field signal is provided, and further, the received low frequency magnetic field signal is demodulated and superimposed on the reception antenna and the reception processing device. There is provided a landslide disaster monitoring system comprising a demodulating circuit for identifying an ID of the detecting device, wherein the position of a slope change or collapse is specified from the demodulated ID of the detecting device.

  Therefore, it is possible to specify the collapse position from the demodulated ID of the detection device.

  Further according to the present invention, the reception processing device further includes a first timer that generates a start signal in a first cycle, and a start-up signal in the first cycle by a start signal from the first timer. Switching each ID of a plurality of detectors installed or embedded in the measurement target range in a first cycle by the transmitter for starting to transmit a high frequency magnetic field signal and the starting signal from the first timer An ID switching circuit that sequentially transmits, an activation modulation circuit that superimposes the ID from the ID switching circuit on the activation low-frequency magnetic field signal, and an activation transmission that transmits the activation low-frequency magnetic field signal on which the ID is superimposed An activation receiving antenna; a second timer; and an activation receiving circuit connected to the activation receiving antenna and periodically receiving by the second timer. The A startup demodulation circuit that demodulates the startup low-frequency magnetic field signal received by the dynamic reception circuit and identifies whether or not the ID of the detection device superimposed thereon is its own ID, and the startup demodulation circuit Receives the activation low-frequency magnetic field signal superimposed with its own ID, activates the transmitter and modulation circuit to transmit the low-frequency magnetic field signal superimposed with its own ID, and on the reception processing device side, It is determined whether or not the low-frequency magnetic field signal on which the self ID is superimposed is received, and the above operation is performed for all of the plurality of detection devices within the measurement target range, thereby the presence of the plurality of detection devices. And a sediment disaster monitoring system characterized by being able to check the soundness regularly.

  Therefore, not only grasping the collapse position and the degree of collapse, but also regularly checking the presence and soundness of the detection device within the measurement target range by the presence or absence of transmission from each detection device by activation from the reception processing device side It becomes possible to do.

According to landslides monitoring system of the present invention, signals from the fact that using the low-frequency magnetic field signal not affected by propagation medium, monitoring the fluctuations and collapse of slope without receiving also constraints without disconnection natural environment Or it becomes possible to detect.

Further, according to the present invention, it is possible to identify the slope change and collapse position from the demodulated ID of the detection device.

Furthermore, according to the present invention, it is possible to periodically check the presence and soundness of the detection device within the measurement target range based on the presence / absence of transmission from each detection device upon activation from the reception processing device side. The effect obtained is great.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram showing the configuration of a sediment disaster monitoring system comprising a first reference example of the real施例of the present invention.

  The earth and sand disaster monitoring system includes a detection device 10, a reception antenna 20, and a reception processing device 30. The detection device 10 is installed or buried in a rock fall guard fence or a slope or the like within the measurement target range, and the receiving antenna 20 is installed outside the measurement target range where there is no risk of disaster. On the other hand, the reception processing device 30 may be installed near the reception antenna 20 when it is necessary to issue an alarm at the measurement target site, but is usually located away from the reception antenna 20 (management center, management Installed in offices).

  The detection device 10 transmits a low-frequency magnetic field signal when the vibration level or the falling angle to be detected is exceeded. The low-frequency magnetic field signal is a magnetic field signal of about 1 kHz to 10 kHz that is usually generated by a combination of a power source, an oscillator, and a coil. For this purpose, the detection device 10 includes a fall sensor 11, a transmitter 12, and a transmission antenna 13 in addition to a built-in battery (not shown) as an operation power source. The fall sensor 11 senses that the installation posture has changed and generates a trigger signal. Here, the fall sensor 11 sends a trigger signal when the fall angle is equal to or greater than a certain value. Since such a fall sensor is well known, detailed description will be omitted, but instead of the fall sensor, another sensor such as a vibration is sensed, and a trigger signal is generated when the vibration level exceeds a certain level. A vibration sensor or the like may be used. Upon receiving this trigger signal, the transmitter 12 is activated to generate a low-frequency magnetic field signal, which is transmitted from the transmission antenna 13.

  The transmitted low frequency magnetic field signal is received by the receiving antenna 20 and input to the reception processing device 30. When receiving the received signal, the reception processing device 30 issues an alarm to the measurement target site and external organizations such as a management center and a management office.

Figure 2 is a block diagram showing the configuration of a sediment disaster monitoring system according to the second reference example of the real施例of the present invention.

This reference example is particularly suitable when a plurality of detection devices are installed or embedded within the measurement target range. That is, when a plurality of detection devices are installed or embedded in the measurement target range, since there is one reception processing device 30, the detection device from which the received low-frequency magnetic field signal is transmitted is identified. There is a need. For this reason, in this reference example, a unique ID is given to each detection device.

  2, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. Here, a modulation circuit 14 is provided between the transmitter 12 and the transmission antenna 13, and a demodulation circuit 24 is provided between the reception antenna 20 and the reception processing device 30.

  In the modulation circuit 14, a unique ID is registered in advance for each detection device. When a low-frequency magnetic field signal is received from the transmitter 12, an operation of superimposing the registered ID on the low-frequency magnetic field signal, that is, a modulation operation Then, the low frequency magnetic field signal on which the ID is superimposed, that is, the modulated low frequency magnetic field signal is transmitted to the transmission antenna 13.

  The modulated low-frequency magnetic field signal transmitted from the transmitting antenna 13 is received by the receiving antenna 20 and then demodulated by the demodulation circuit 24 to identify the ID of the detection device that has transmitted the low-frequency magnetic field signal. The ID of the identified detection device is input to the reception processing device 30. The reception processing device 30 can also send the identified ID together with an alarm to an external organization such as a management center or a management office. Thereby, it can be grasped where the disaster such as landslide occurred in the measurement target range.

FIG. 3 is a diagram showing an application example of the second reference example described above. Here, a plurality of detection devices are buried in the soil and rocks on the shoulders of the tracks and on the mountainside slopes. Low frequency magnetic field signals propagate in rocks as well as in the ground and water. Each of the plurality of detection devices is individually assigned an ID (typically IDA to IDD). In an external organization such as a management center or a management office, the embedded position of the detection device is mapped in advance on the display. As a result, the scope of the disaster can be displayed by blinking the detection device that detected the disaster by mapping on the display based on the ID of the detection device transmitted when the disaster occurred, or by changing the color to display the external organization. In addition to being able to process the time series in a time series, it is also possible to quickly carry out the planning and construction of countermeasure work after the fact.

FIG. 4 is a diagram showing another application example of the second reference example described above. Here, in addition to the application example of FIG. 3, the detection device is embedded at different depths with respect to the depth direction of the slope. For example, when applied to a landslide surface, etc., by identifying the depth of the detection device from which the low-frequency magnetic field signal is transmitted by burying a plurality of detection devices at different depths at the same burying point Therefore, it is possible to specify the landslide surface such as how deep the landslide has occurred.

Figure 5 is a block diagram showing the configuration of a sediment disaster monitoring system according to the real施例of the present invention. In the sediment disaster monitoring system according to this embodiment, the following configuration is added to the configuration according to the second reference example shown in FIG.

  On the reception processing device 30 side, a first timer 31 that generates a start signal in a first cycle, and a start-up that sends a start low-frequency magnetic field signal in a first cycle by a start signal from the first timer 31 Transmitter 32, and an ID switching circuit 33 for switching all IDs of a plurality of detection devices installed in the measurement target range by a start signal from the first timer 31 and transmitting them sequentially in a first cycle The startup modulation circuit 34 for superimposing the ID from the ID switching circuit 33 on the startup low-frequency magnetic field signal from the startup transmitter 32, and the startup transmission antenna for transmitting the startup low-frequency magnetic field signal superimposed with the ID 35.

  On the other hand, each detection device 10 includes an activation reception antenna 15, a second timer 16, an activation reception circuit 17 connected to the activation reception antenna 15 and periodically in a reception state by the second timer 16. An activation demodulating circuit 18 is provided for demodulating the activation low frequency magnetic field signal received by the activation receiving circuit 17 and specifying whether or not the ID of the detection device superimposed thereon is the self ID.

  When the activation demodulating circuit 18 receives the activation low-frequency magnetic field signal on which the own ID is superimposed, the activation demodulation circuit 18 activates the transmitter 12 and the modulation circuit 14 to transmit the low-frequency magnetic field signal on which the own ID is superimposed from the transmission antenna 13. .

  On the reception processing device 30 side, the low frequency magnetic field signal received by the receiving antenna 20 is demodulated by the demodulation circuit 24, and the received low frequency magnetic field signal is a low frequency magnetic field signal on which the ID of which detection device is superimposed. Discrimination, that is, identification is performed.

  The ID specifying operation is performed for all of the plurality of detection devices within the measurement target range. When receiving the ID specified by the demodulation device 34, the reception processing device 30 determines that the detection device having this ID can operate normally. In this way, the presence and soundness of a plurality of detection devices can be periodically confirmed.

  Note that it is preferable that the generation cycle of the activation signal from the first timer 31, that is, the first cycle and the generation cycle of the activation signal from the second timer 16 are synchronized. For this purpose, it is desirable that at least the first timer 31 among the components on the reception processing device 30 side added in the present embodiment is built in the reception processing device 30. That is, the reception processing device 30 can more reliably identify the detection device by comparing the ID transmitted from the ID switching circuit 33 with the transmission timing and the ID superimposed on the received low-frequency magnetic field signal. In addition, it is possible to determine that the signal is not a low-frequency magnetic field signal accompanying the occurrence of a disaster but a signal sent for periodic health check. On the other hand, by adding specific information separately from the ID to the low-frequency magnetic field signal generated by the transmitter 12 in response to the activation signal on the reception processing device 30 side, the detection device 10 generates a low-frequency signal when a disaster occurs. You may make it distinguishable from a magnetic field signal. Of course, the specific information in this case may be information common to a plurality of detection devices.

  Further, from the viewpoint of extending the life of the battery built in the detection device 10, when the fall sensor 11 generates a trigger signal, and in the embodiment of FIG. 5, a low frequency magnetic field signal for activation with its own ID superimposed is received. In this case, it is preferable that the battery power supply to other circuits is turned on.

As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to said Example and application example.

FIG. 1 is a block diagram showing the configuration of a sediment disaster monitoring system according to a first reference example of the present invention. FIG. 2 is a block diagram showing a configuration of a sediment disaster monitoring system according to a second reference example of the present invention. FIG. 3 is a diagram showing an application example of the second reference example of the present invention. FIG. 4 is a diagram showing another application example of the second reference example of the present invention. Figure 5 is a diagram showing a configuration of a sediment disaster monitoring system according to the real施例of the present invention. FIG. 6 is a diagram showing a configuration of an example of a conventional sediment disaster monitoring facility.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Detection apparatus 11 Fall sensor 12 Transmitter 13 Transmission antenna 14 Modulation circuit 20 Reception antenna 30 Reception processing apparatus

Claims (2)

A sensor that generates a trigger signal upon sensing that the installation posture has changed, a transmitter that transmits a low-frequency magnetic field signal in a frequency range of 1 to 10 kHz by the trigger signal from the sensor, and a transmitter that is transmitted from the transmitter A detection device including a transmission antenna for transmitting a low-frequency magnetic field signal;
A receiving antenna for receiving a low-frequency magnetic field signal from the detection device;
A reception processing device that receives a reception signal of the reception antenna and issues an alarm;
The sensing device to the swash surface by installing or embedded one or more, in landslides monitoring system transmits an alarm to sense fluctuations and collapse of slope,
A plurality of the detection devices are installed or embedded in the measurement target range, while the receiving antenna is installed outside the measurement target range,
Each detection device further includes a modulation circuit for superimposing an ID unique to the detection device on the low-frequency magnetic field signal from the transmitter,
A demodulation circuit for demodulating the received low-frequency magnetic field signal and identifying the ID of the detection device superimposed thereon, between the reception antenna and the reception processing device;
From the demodulated ID of the detection device, specify the position of the slope change or collapse,
The reception processing device further includes a first timer that generates a start signal in a first cycle, and a start-up that sends a start low-frequency magnetic field signal in a first cycle by the start signal from the first timer. An ID switching circuit for switching each ID of a plurality of detection devices installed or embedded in a measurement target range by a start signal from the first timer in a first cycle and sequentially transmitting the IDs A startup modulation circuit that superimposes the ID from the ID switching circuit on the startup low-frequency magnetic field signal, and a startup transmission antenna that transmits the startup low-frequency magnetic field signal superimposed with an ID,
The detection apparatus further includes an activation reception antenna, a second timer, an activation reception circuit connected to the activation reception antenna and periodically in a reception state by the second timer, and the activation reception circuit A demodulator for activation that demodulates the low frequency magnetic field signal for activation received in step 1 and identifies whether or not the ID of the detection device superimposed thereon is its own ID,
When the activation demodulator circuit receives the activation low-frequency magnetic field signal with its own ID superimposed, it activates the transmitter and the modulation circuit to transmit the low-frequency magnetic field signal with its own ID superimposed,
On the reception processing device side, it is determined whether or not the low frequency magnetic field signal on which the self ID is superimposed is received,
A sediment disaster monitoring system characterized in that the presence and soundness of the plurality of detection devices can be periodically confirmed by performing the above operation for all of the plurality of detection devices within the measurement target range . In the earth and sand disaster monitoring system according to claim 1 ,
A sediment disaster monitoring system characterized in that a plurality of the detection devices are buried at different depths in the depth direction.

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