JP4997444B2 - Rockfall risk assessment system - Google Patents

Description

  The present invention relates to a system that collects measurement information from a sensor terminal that measures an acceleration value of a rock or the like and determines a rock fall risk level.

  Falling rocks, landslides, etc. will cause serious damage to the vehicles traveling directly underneath and surrounding buildings, so it is desirable to reinforce the dangerous areas and constantly monitor them. For this reason, high-risk grounds and rocks are inspected by construction personnel with hammers or by visual inspection. In addition, to measure the amount of displacement at the hazardous location, a means of monitoring using an extensometer that places multiple piles on the bedrock, etc. and a means of measuring the amount of displacement using an auto-tracking optical wave rangefinder are used. Has been.

  However, manual inspection is dangerous and requires a lot of labor, and inspection may be overlooked in a wide area. Furthermore, manual visual inspections and the like may differ depending on the inspection operator and cannot be used as risk determination data.

  Moreover, in the case of measurement with an extensometer, it takes time and expense to install the pile, and depending on the conditions at the site, there are dangers, so installation may be difficult. Further, in the case of measuring the amount of displacement using a light wave rangefinder, the measurement equipment is expensive, and since lenses and mirrors are used, there are deficiencies such as a decrease in measurement accuracy due to dirt adhered due to long-term use.

In view of this, there has been proposed a technique for detecting rock fall occurrence and a sign of rock fall occurrence by measuring strain using an optical fiber sensor, which makes it easy to perform stable and long-term remote monitoring without requiring constant power supply (for example, patents) Reference 1). This measurement technique detects rock fall by detecting a change in curvature that occurs when a colliding object hits an installed optical fiber.
JP 2002-267549 A

  However, since the technique described in Patent Document 1 detects a change in curvature caused by a collision of a falling rock object, it cannot detect a fine movement of a rock before falling rock. In addition, there is a problem that the cost and installation cost required for the optical fiber and its detection equipment are enormous.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rock fall risk determination technique for detecting the amount of rock movement and the direction of movement from a remote location and determining the risk of falling rocks, etc., without relying on human hands.

  In order to achieve the above object, the present invention provides a sensor terminal that is installed on a rock and measures an acceleration value associated with the movement of the rock, and a measurement that collects measurement information of the acceleration value measured by the sensor terminal. The present invention proposes a rock fall risk determination system including an information collection device and a determination server for determining the rock fall risk of the rock based on the measurement information collected by the measurement information collection device.

  Here, the sensor terminal includes a triaxial acceleration sensor that measures acceleration values in the X-axis direction, the Y-axis direction, and the Z-axis direction, and a sensor terminal communication unit that wirelessly transmits measurement information measured by the triaxial acceleration sensor. And can be provided.

  The measurement information collection device includes: a collection device communication unit that transmits and receives information to and from the sensor terminal and the determination server by wireless communication; and a control unit that performs processing for transmitting the measurement information acquired from the sensor terminal to the determination server. It can be provided.

  Furthermore, the determination server includes a communication unit that acquires measurement information from the measurement information collection device, a calculation unit that calculates a movement distance and a movement direction of the rock based on the acquired measurement information, and a calculated movement distance and movement. There may be provided rock fall risk determining means for comparing the direction and a preset set value to determine the rock fall risk level.

  According to the rock fall risk determination system of the present invention described above, a sensor terminal having a triaxial acceleration sensor that measures acceleration values in three axis directions (X axis direction, Y axis direction, Z axis direction) It is installed on the rock that is subject to danger monitoring, and the measurement information measured by this is sent to the judgment server. The judgment server calculates the movement distance and direction of the rock on which the sensor terminal is installed based on the measurement information. Then, the calculated moving distance and moving direction are compared with preset values to determine the falling rock risk level.

  As a result, the data acquired by the 3-axis acceleration sensor is acquired by wireless transmission, and the position, amount, and direction of the rock where the sensor terminal is installed can be determined without relying on personnel. Can be grasped in advance, and the occurrence of falling rocks can be grasped safely from a remote location. In particular, the position, amount and direction of rocks that are covered with grass or trees, which are difficult to see from the ground, can be accurately grasped, and the dangers such as falling rocks can be grasped in advance, and the occurrence of falling rocks can be detected. It becomes possible to grasp safely from a remote place.

  In the rock fall risk determination system of the present invention, the sensor terminal can be installed on at least one rock.

  For example, in rockfall hazard zones where rockfalls may occur, sensor terminals are installed on multiple rocks, and the acceleration in the three-axis directions of these multiple rocks is measured. Can be determined.

  In addition to rocks, it is advantageous to attach the sensor terminal to the rock fall protection fence, because even if the sensor terminal attached to the rock is broken, the occurrence of rock fall and the rock fall position can be known.

  In the rock fall risk determination system of the present invention, the determination server includes terrain information recording means for recording the terrain information of the point where the sensor terminal is installed, and geological information recording means for recording the geological information of the point. Furthermore, it can be carried.

  By determining the rock fall risk using the measurement information of the acceleration value of the rock measured by the sensor terminal, the terrain information and the geological information, for example, the difference of the falling rock pattern such as rotating fall and sliding fall is also judged. It becomes possible.

  Here, information such as volcanic ash, volcanic rock, sedimentary rock, and the like can be adopted as the geological information as the slope information, slope condition, surrounding terrain information, and the like as the topographic information. Based on these pieces of information, the determination reference value is set and determined. For example, even if the measurement information of acceleration values in the same three-axis direction is a geological location where rockfalls are likely to occur with a small amount of vibration, a more accurate risk determination can be performed by changing the above determination reference value. Can be done.

  In the rock fall risk determination system of the present invention, the sensor terminal is preferably installed on the rock with one measurement axis of the three-axis acceleration sensor as a magnetic north direction.

  If it does in this way, based on the measurement information of an acceleration value, the moving direction of a rock can be displayed exactly.

  When installing the sensor terminal, the latitude and longitude of the installation point are measured with a GPS measuring instrument, etc., and recorded in the sensor terminal, measurement information collection device, and determination server, enabling more accurate risk determination at the location. Can be.

  In the rock fall risk determination system of the present invention, the sensor terminal and the measurement information collection device may each include power supply means including a solar battery power generation device and a storage battery.

  This eliminates the need for a commercial power supply, thus eliminating the need for wiring work in conjunction with wireless transmission of measurement information.

  In addition, you may provide the coil which produces an induced current with a received radio wave, without installing a power supply means in a sensor terminal. However, in order to always measure, it is desirable to have a form having power supply means.

  Furthermore, the sensor terminal may include a voltage measurement unit, and the sensor terminal communication unit may wirelessly transmit information on the voltage at the sensor terminal grasped by the voltage measurement unit.

  For example, the voltage measuring means provided in the sensor terminal measures the voltage at the sensor terminal at predetermined time intervals, and the sensor terminal communication means previously stores information on the voltage at the sensor terminal thus measured. Each time a predetermined time interval is wirelessly transmitted, or each time the sensor terminal communication means wirelessly transmits measurement information of an acceleration value measured by the sensor terminal, the measurement information is attached to the measurement information to relate to the voltage at the sensor terminal. Information is wirelessly transmitted, and this is acquired by the determination server via the measurement information collection device. In this way, the determination server can monitor the voltage state at the sensor terminal.

  Thus, when the voltage at the sensor terminal falls below a predetermined capacity, the interval at which measurement is performed by the triaxial acceleration sensor at the sensor terminal is adjusted (for example, the interval is increased) and consumed at the sensor terminal. It is possible to control power consumption such as reducing power consumption.

  According to the present invention, it is possible to grasp the position of the rock where the sensor terminal is installed, the amount of movement, and the movement direction without depending on personnel, to grasp the danger of falling rocks, and to prevent the occurrence of falling rocks from a remote location. Can be grasped safely. In particular, the position, amount and direction of rocks that are covered with grass or trees, which are difficult to see from the ground, can be accurately grasped, and the dangers such as falling rocks can be grasped in advance, and the occurrence of falling rocks can be detected. It becomes possible to grasp safely from a remote place.

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

  FIG. 1 is a schematic overall configuration diagram illustrating a preferred example of a rock fall risk determination system according to the present invention.

  As shown in FIG. 1, the rock fall risk determination system according to the present invention is installed on rocks 1 a, 1 b, etc., where rocks may fall, and measures acceleration values in three axial directions of the rocks 1 a, 1 b, etc. The sensor terminal 2a, 2b, the measurement value collection device 3 that collects the measurement information of the acceleration value measured by the sensor terminal 2a, 2b via wireless, and the measurement information of the acceleration value collected by the measurement value collection device 3 And a determination server 7 that receives the communication line 6 through the wireless communication base station 5 and determines the risk of falling rocks based on the measurement information. Hereinafter, the sensor terminals 2a, 2b, etc. may be collectively referred to as “sensor terminal 2”.

  In the embodiment shown in FIG. 1, a total of two sensor terminals 2 are installed, one for each of the rocks 1a and 1b. However, when only one rock is to be monitored, it is installed on the rock. Only one sensor terminal 2 is sufficient. On the other hand, when there are a large number of rocks to be monitored, one sensor terminal 2 is installed for each rock, so that the number corresponds to the number of rocks to be monitored. The sensor terminal 2 will be installed. Usually, since it installs in many rocks so that a rockfall range may be covered, 3 or more sensor terminals 2 are installed in many cases.

  FIG. 2 is a diagram illustrating a schematic configuration of an example of a sensor terminal in the rock fall risk determination system. In the example illustrated in FIG. 2, the sensor terminal 2 includes an acceleration sensor 10 in the three-axis (X-axis, Y-axis, and Z-axis) directions, a recording device 11 that is a sensor terminal recording unit that records measurement information of acceleration values, An RTC (Real Time Clock) 12 that is a chip for a watch, an IC chip 13 having a function for instructing a measurement procedure, a function for transmitting measurement information, and the like, an antenna 15 for wireless transmission / reception, and via a bus 14 To exchange data. In the illustrated embodiment, the sensor terminal 2 includes a power supply device 16.

  The triaxial acceleration sensor 10 includes accelerometers 17a, 17b, and 17c that measure acceleration values in three axial directions (X axis, Y axis, and Z axis) of a rock. Measurement information of acceleration values measured by these accelerometers 17a, 17b, and 17c is amplified by amplifiers 18a, 18b, and 18c, and this measurement information that is an analog value is digitally converted by A / D converters 19a, 19b, and 19c. Converted to a value.

  As accelerometers 17a, 17b, and 17c that measure acceleration values in the three-axis directions (X-axis, Y-axis, and Z-axis) of rocks, those known in this technical field can be adopted. When a member and a mass member are stacked and acceleration is applied to this, the load of the mass member on the piezoelectric member changes, and changes in the electrical signal from the piezoelectric member that change in relation to the change in the load are detected. What detects an acceleration is employable. In addition, a single beam is projected from the silicon substrate to support the mass member, and a strain gauge is formed on the beam, and acceleration is detected from a change in the electrical resistance of the strain gauge caused by bending of the beam due to acceleration. Can also be adopted.

  The recording device 11 that is a sensor terminal recording unit that records acceleration value measurement information records acceleration measurement information together with the time obtained by the RTC 12, and may employ a flash memory, for example.

  In the illustrated embodiment, the IC chip 13 includes a communication circuit 25, a CPU 21, a ROM 22, a RAM 23, and an I / F (interface) 26. The communication circuit 25 serves as a sensor terminal communication unit that transmits and receives information to and from the measurement value collection device 3 through wireless communication. For example, the CPU 21 performs a measurement command, a measurement procedure instruction, a measurement information recording, a transmission instruction, and the like for the acceleration sensor 10. In the ROM 22, for example, a computer program for causing the CPU 21 to perform the above-described functions is recorded. The RAM 23 records data and programs when the CPU 21 is operated, for example. The I / F (interface) 26 is used when communicating with other devices.

  As the power source 16, for example, a power source that includes a cell that performs solar battery power generation and a storage battery that charges electricity generated by the cell can be employed. Moreover, it can comprise so that electricity may be supplied to each apparatus and each means of the sensor terminal 2 from the power supply 16 with the electric wire which is not shown in figure.

  FIG. 3 is a diagram illustrating a schematic configuration of an example of the measurement information collection device 3 in the rock fall risk determination system. In the example illustrated in FIG. 3, the measurement information collection device 3 includes a collection recording device 31 that is a recording unit that records measurement information transmitted from the sensor terminal 2, an RTC (Real Time Clock) 32 that is a watch chip, and the like. An IC chip 33 having a function of transmitting / receiving measurement information and a recording instruction and an antenna 35 for wireless transmission / reception are provided to exchange data via a bus 37. In the example shown in FIG. 3, the measurement information collection device 3 includes a power source 36.

  The collection and recording device 31 is a device that records measurement information of acceleration values transmitted from the sensor terminal 2, and may employ, for example, a flash memory. In the collection and recording device 31, the measurement information of the acceleration value transmitted from the sensor terminal 2 is recorded in association with each sensor terminal 2a, 2b, etc., for example, for each sensor terminal 2a, 2b, etc. It has become.

  The RTC 32 and the power source 36 can be the same as the RTC 12 and the power source 16 of the sensor terminal 2 described above.

  The collection / recording device 31 may be installed as an in-vehicle device, or may be a portable type that enables browsing of measurement information on site.

  In the illustrated embodiment, the IC chip 33 includes a communication circuit 38, a CPU 39, a ROM 40, a RAM 41, and an I / F (interface) 44. The communication circuit 38 has a function of a collection device communication unit that transmits and receives information to and from the sensor terminal 2 and the determination server 7 by wireless communication. For example, the CPU 39 has a function as a command unit that commands the sensor terminal 2 to transmit measurement information, and a function as a control unit that records the received measurement information in the collection recording device 31 and transmits it to the determination server 7. Is. In the ROM 40, for example, a computer program for causing the CPU 39 to perform the above-described functions is recorded. The RAM 41 records data and programs when the CPU 39 operates, for example. The I / F (interface) 44 is used when communicating with other devices.

  FIG. 4 is a diagram illustrating a schematic configuration of an example of the determination server 7 in the rock fall risk determination system of the present invention.

  In the embodiment shown in FIG. 4, the determination server 7 includes a communication unit 51, a measurement value DB 52, a calculation unit 53, a rockfall risk determination unit 55, a terrain DB 56, a geological DB 57, a determination DB 58, and a control unit 59. 60 is used to exchange data.

  The communication means 51 receives measurement information from the measurement information collection device 3 via the communication line 6 (FIG. 1).

  The measurement value DB 52 is a measurement information recording unit that records the position information of the latitude / longitude of the installation position where the sensor terminal 2 is installed, the measurement information received by the communication unit 51, and the like.

  The calculating means 53 calculates the moving distance and moving direction of the rock based on the received measurement information.

  The falling rock risk determination means 55 compares the moving distance and moving direction calculated by the calculating means 53 with preset values to determine the falling rock risk degree.

  The terrain DB 56 and the geological DB 57 respectively serve as terrain information recording means for recording the terrain information at the point where the sensor terminal 2 is installed and as geological information recording means for recording the geological information at the point where the sensor terminal 2 is installed. It is.

  The determination DB 58 plays a role of recording a preset setting value (reference value) used for the above-described determination performed by the rock fall risk determination means 55 and a determination result by the rock fall risk determination means 56. It is.

  The control means 59 plays a role of controlling the functions of each means and apparatus described above of the determination server 7.

  The determination server 7 may use a dedicated device used in the present embodiment, but is a combination of a general-purpose personal computer or workstation and a peripheral device such as a modem. You can also.

  A preset setting value (reference value) for comparison used in the above-described determination performed by the rock fall risk determination means 55 recorded in the determination DB 58, that is, a reference value for determination is three axes (X (Axis, Y-axis, Z-axis) direction acceleration value measurement information, and the rock movement direction and movement distance calculated by this measurement information can be used as a reference value set according to the degree of determination stage. it can.

  Furthermore, what is set for each determination stage as a final reference value obtained by multiplying the correction value based on the terrain information and the geological information can be set as a preset setting value (reference value). Here, as a correction value, when it is a site of a steep slope where rockfalls are particularly likely to occur or when it is a slippery geological feature of volcanic ash, it is determined to be a higher risk determination. can do.

  The rock fall risk determination means 55 predicts rock fall occurrence, for example, stepwise or in percentage with reference to the reference value for comparison used in the determination performed by the rock fall risk determination means 55 recorded in the determination DB 58. Can be done.

  Further, when the measurement information exceeds a predetermined reference value recorded in the determination DB 58, a rockfall occurrence determination is performed, and a plurality of adjacent sensor terminals 2 that are continuously installed are similar. When it is a judgment (falling rock occurrence judgment due to exceeding a predetermined reference value recorded in the judgment DB 58), a falling rock is generated by specifying a range where the plurality of sensor terminals 2 are continuously installed. A determination may be made.

  Next, an example of the operation of the rock fall risk determination system of the present invention will be described with reference to the flowchart of the procedure for installing the sensor terminal 2 in FIG. 5 and the flowchart of the determination procedure in FIG.

  As shown in FIG. 5, in order to monitor and predict rockfall in the rockfall danger zone, the rock in the rockfall danger zone is investigated, and the rock where the sensor terminal 2 is installed and the position where the sensor terminal 2 is attached are selected (S1). . By detecting rocks that are subject to rock fall monitoring, and constantly monitoring the measurement information of acceleration values due to vibration, movement, and fall of this rock, it is possible to predict rock fall and discover the fact of rock fall.

  When the sensor terminal 2 is installed, the magnetic north direction is measured by a magnetic north sensor (not shown) which is a magnetic north detection device (S2). A magnetic north detection device (magnetic north sensor) (not shown) is a device that detects and displays the magnetic north of geomagnetism by detecting the geomagnetic field strength components in the directions of three axes (X axis, Y axis, Z axis).

  Then, the sensor terminals 2a and 2b are respectively installed on the rocks (for example, the rocks 1a and 1b) to be fallen rock monitoring with the X-axis direction of the acceleration sensor 10 aligned with the magnetic north (S3). By setting the X-axis direction of the acceleration sensor 10 toward magnetic north, the moving direction of the rocks 1a and 1b can be indicated by the direction from the measurement information of the acceleration value thereafter.

  When the sensor terminals 2a and 2b are installed on the rocks 1a and 1b, the position information of the latitude and longitude of the installation position is measured by a GPS measurement device (not shown) and recorded in the measurement DB 52 of the determination server 7 (S4). . This recording may be directly input to the determination server 7 or may be transmitted to the determination server 7 after being input to the measurement information collection device 3.

  After the sensor terminals 2a and 2b are installed, it is determined whether or not the sensor terminal 2 needs to be further installed in other surrounding rocks, and the installation locations are increased or the installation is terminated as necessary (S5). When determining and monitoring a wide range of rockfall risk, the number of installed sensor terminals 2 is increased.

  Next, as shown in FIG. 6, the measurement information collection device 3 instructs the sensor terminal 2 to transmit measurement information of acceleration values (S11).

  Based on this command, the sensor terminal 2 measures acceleration values of the rocks 1a and 1b based on measurement instruction information recorded in advance in the ROM 22 and RAM 23.

  The measurement instruction information recorded in advance in the ROM 22 and RAM 23 is, for example, an operation in which measurement is performed every predetermined period and the result is recorded in the recording device 11 of the sensor terminal 2 together with the measurement time. It can be done.

  Further, the measurement instruction information recorded in advance in the ROM 22 and RAM 23 is grasped when the acceleration value changes more than a predetermined value, and this measurement information is recorded in the recording device 11 of the sensor terminal 2 together with the measurement time. The operation can be performed.

  One or both of these measurement methods can be performed based on measurement instruction information recorded in advance in the ROM 22 and RAM 23.

  The measurement method can be changed by overwriting and changing the information recorded in the RAM 23 of the sensor terminals 2a and 2b from the measurement information collecting device 3.

  Therefore, for example, in the event of a disaster such as a heavy rain or an earthquake, or during an emergency such as when it is necessary to continuously monitor the risk of a secondary disaster while performing recovery work in such a disaster. It is also possible to instruct the sensor terminals 2a and 2b to change the measurement method from the server 7 via the measurement information collection device 3, and to continuously monitor for a necessary time.

  When receiving a measurement information transmission command, the sensor terminals 2a and 2b transmit the measurement information of the acceleration value recorded in the recording device 11 of the sensor terminal 2 to the measurement information collecting device 3 (S12).

  When the collection of measurement information from each sensor terminal 2a, 2b is completed, the measurement information collection device 3 transmits the measurement information to the determination server 7 (S13). Transmission is performed wirelessly from the measurement information collection device 3 via the base station 5 to the determination server 7 via the communication line 6.

  The determination server 7 that has received the measurement information records the control unit 59 in the measurement value DB 52 in association with the identification number that identifies the sensor terminal 2, and the calculation unit 53 records the rocks 1 a and 1 b based on the measurement information. The moving direction and moving amount are calculated (S14).

  Here, referring to FIG. 7 showing the procedure for calculating the inclination angle of the acceleration sensor 10 from the measurement information of the acceleration value and FIG. 8 showing the procedure of calculating the movement amount by the rock rotation from the measurement information of the acceleration value, A calculation procedure by the calculation means 53 will be described.

  FIG. 7A is a schematic view of the acceleration sensor 10 that measures acceleration values in the directions of three axes (X axis, Y axis, and Z axis). FIG. 7B is a diagram illustrating the acceleration sensor 10 installed on a slope. It is a figure which shows a case.

  In FIG. 7B, the X-axis direction of the acceleration sensor 10 is installed in parallel with the inclination direction of the slope, and at this time, the acceleration value of the acceleration sensor 10 in the X-axis direction and the gravitational acceleration value in the vertical direction are used. The inclination angle θ is obtained by θ = arcsin {(acceleration value in the X-axis direction) / (gravity acceleration value)}. By calculating the tilt in the Y-axis and Z-axis directions in the same manner, it is possible to calculate a three-dimensional tilt angle.

  Next, the calculation of the movement distance by the rotation of the rock will be described with reference to FIG.

  The movement distance due to rock slip can be calculated by using the acceleration measurement information as it is, but depending on the weight, topography / geology, and acceleration value of the rock, movement due to rotation occurs instead of slipping. When the measured information is within the range where the rotation occurs and the set value, the rotation distance is calculated and displayed.

  In FIG. 8, the rock 1 represented by a solid line is before rotation, and the rock 1 represented by a broken line is after rotation. Point a indicates the center of rotation, point d indicates the installation position of the acceleration sensor 10 before rotation, and point b indicates the installation position of the acceleration sensor 10 after rotation.

  Line segment ad and line segment bg indicate the direction of gravity, and straight line df and straight line bf indicate the same one axial direction (for example, the X axis) of acceleration sensor 10 before and after rotation, respectively. Is f. Then, after the straight line df is rotated, it corresponds to a rotational movement of the straight line cf.

  Here, the length of db which is the rotation distance is obtained. First, the rotation angle ∠dab = φ = ∠abg is obtained. Assuming that ∠adf = θ1 and ∠gbf = θ2, since 変 動 adf = ∠abf because there is no fluctuation due to rotation, φ = ∠abg = θ1-θ2. Therefore, the rotation distance db = ad (rotation radius, rock height) × tan (φ) can be obtained. Since θ1 and θ2 can be obtained by calculating the tilt angle described with reference to FIG. 7, the rotational distance db can be calculated by measuring the height (rotating radius) of the rock in advance.

  Returning to the flowchart of FIG. 6, it is determined whether or not the calculated movement amount (rotation, slipping) of the rock is equal to or greater than a set value (S15). When the amount of movement is not equal to or greater than the set value, when there is no falling rock or when there is a low possibility of falling rock, return to the first collection of measurement information without judging the risk level. . On the other hand, if the set value is exceeded, it is assumed that there is a possibility of rock fall or rock fall, and the topographic data and geological data of the sensor terminal installation location are obtained from the topographic DB 56 and the geological DB 57, respectively, and the correction numerical value based on both data Is multiplied by the set value to be the reference value for the rock fall risk determination (S16).

  Based on the comparison difference between the reference value and the movement amount, the measurement information and the moving direction, etc., the rock fall risk level is determined (S18). When the judgment is made that there is a rock fall, the degree is displayed, and when there is a possibility of the rock fall, the possibility of the occurrence is indicated by a numerical value.

  If there is a determination result at another sensor terminal, the risk of falling rock as a wide area is determined by displaying it together (S17).

  FIG. 9 is a diagram illustrating an example of a determination result display field, and this display field is displayed on a display or the like (not shown) of the determination server 7.

  By installing a sensor terminal equipped with an acceleration sensor for measuring the acceleration in the three-axis (X-axis, Y-axis, Z-axis) direction of the rock in this way, the measurement information of the acceleration value is acquired and transmitted. The measurement information can be received even in a remote place, and the moving direction and moving distance of the rock can be calculated. Then, it is possible to determine the risk of falling rocks such as the fact of falling rocks and the possibility of falling rocks from the moving distance and the like, and it is possible to remotely monitor the rock falling risk site.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to such embodiments, and various forms are possible within the technical scope grasped from the description of the claims. Can be changed.

  For example, the sensor terminal 2 shown in FIG. 2 further includes voltage measurement means (not shown), and the voltage measurement means is determined in advance under the control of the CPU 21 based on the computer program, for example. At each time interval, the voltage at the sensor terminal 2 is measured, and information regarding the voltage value at the sensor terminal 2 measured by the voltage measuring means is sent to the measured value collection device 3 by wireless transmission via the communication line 25. Can be.

  In this case, each time the communication line 25 wirelessly transmits the measurement information of the acceleration value under the control of the CPU 21 based on the computer program, the voltage at the sensor terminal 2 is attached to the measurement information and measured by the voltage measuring means. It is possible to send information related to the value to the measured value collection device 3 by wireless transmission via the communication line 25.

  Thereby, in the determination server 7, the information regarding the value of the voltage in the sensor terminal 2 measured by the voltage measuring means is acquired via the communication circuit 38 of the measurement value collecting device 3, and the voltage state ( For example, the remaining capacity of the power source (power storage device) can be acquired and monitored at predetermined time intervals.

  Therefore, for example, a sensor terminal power remaining capacity determination unit (not shown) provided in the determination server 7 is under the control of the control unit 59 based on the computer program, for example, the voltage state (for example, power ( Compare / determine whether the remaining capacity of the power storage device) exceeds a predetermined state (for example, the value of the remaining capacity of the power source (power storage device) determined in advance). When it is determined that the value does not exceed, the sensor means 2 is connected to the sensor terminal 2 from the communication means 51 of the determination server 7 via the communication circuit 38 of the measurement value collection device 3 under the control of the control means 59 based on the computer program. Then, a change in the measurement method (for example, the recording device 11 of the sensor terminal 2 that lengthens a predetermined time interval for measuring the acceleration value performed at the sensor terminal 2) Take measures to adjust the amount of power consumed in the sensor terminal 2 by reducing the type and amount of information to be recorded, reducing the type and amount of information wirelessly transmitted from the communication circuit 25 of the sensor terminal 2, and so on. It becomes possible.

  Thereby, while controlling the power consumption in the sensor terminal 2, on the other hand, as described above, the measurement method is changed from the determination server 7 to the sensor terminal 2 via the measurement information collecting device 3 at the time of disaster. It is possible to perform an efficient and appropriate measurement according to the situation by instructing and monitoring continuously for a necessary time.

The whole schematic block diagram explaining schematic structure of an example of the rock fall risk determination system of this invention. The schematic block diagram explaining the schematic structure of an example of the sensor terminal in the rock fall risk determination system of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Schematic block diagram explaining schematic structure of an example of the measurement information collection apparatus in the rock fall risk determination system of this invention. The schematic block diagram explaining the schematic structure of an example of the determination server in the rock fall risk determination system of this invention. The flowchart explaining an example of the procedure which installs a sensor terminal. The flowchart explaining an example of the determination procedure by the rock fall risk determination system of this invention. (A) The schematic of the acceleration sensor which measures the acceleration value of 3 axis | shafts (X-axis, Y-axis, Z-axis) direction, (b) The figure which shows the case where an acceleration sensor is installed in the slope. The figure explaining the calculation method of the movement distance by rotation of the rock in which the sensor terminal is installed. The figure showing an example of the display column of a determination result.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b Rock 2a, 2b Sensor terminal 3 Measurement information collection device 7 Determination server 10 Acceleration sensor 11 Sensor terminal recording device 13 IC chip 31 Collection recording device 33 IC chip 51 Communication means 52 Measurement value DB
53 Calculation means 55 Falling rock risk judgment means

Claims (6)

A sensor terminal that is installed in a rock and measures an acceleration value associated with the movement of the rock, a measurement information collection apparatus that collects measurement information of an acceleration value measured by the sensor terminal, and the measurement information collection apparatus A rock fall risk determination system comprising a determination server that determines the rock fall risk of the rock based on the collected measurement information,
The sensor terminal includes a triaxial acceleration sensor that measures acceleration values in the X-axis direction, the Y-axis direction, and the Z-axis direction, and a sensor terminal communication unit that wirelessly transmits measurement information measured by the triaxial acceleration sensor. And
The measurement information collection device includes a collection device communication unit that transmits and receives information to and from the sensor terminal and the determination server by wireless communication, and a control unit that performs a process of transmitting the measurement information acquired from the sensor terminal to the determination server. ,
The determination server includes a communication unit that acquires measurement information from a measurement information collection device, a calculation unit that calculates a movement distance and a movement direction of the rock based on the acquired measurement information, and a calculated movement distance and movement direction. A rockfall risk determination system comprising: a rockfall risk determination unit that determines a rockfall risk level by comparing with a preset setting value.   2. The rock fall risk determination system according to claim 1, wherein each of the sensor terminals is installed on at least one rock.   3. The determination server further comprises terrain information recording means for recording terrain information at a location where the sensor terminal is installed, and geological information recording means for recording geological information at the location. Described rock fall risk assessment system.   4. The rock fall risk determination system according to claim 1, wherein the sensor terminal is installed on the rock with one measurement axis of the 3-axis acceleration sensor as a magnetic north direction. 5.   5. The rock fall risk determination system according to claim 1, wherein each of the sensor terminal and the measurement information collection device includes power supply means including a solar battery power generation device and a storage battery. .   6. The sensor terminal includes a voltage measurement unit, and the sensor terminal communication unit wirelessly transmits information on the voltage at the sensor terminal grasped by the voltage measurement unit. The rock fall risk determination system according to any one of the above.

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