JP2020071157A - Inclination degree calculation device, structure, and program - Google Patents

Abstract

To correctly evaluate the degree of inclination of a structure.SOLUTION: The inclination degree calculation device includes: a temperature acquisition unit for acquiring the temperature of a first site of a structure obtained by a first temperature sensor and acquiring the temperature of a second site of a structure obtained by a second temperature sensor; an inclination angle acquisition unit for acquiring the measured value of the inclination angle of the structure obtained by the first inclination sensor; a calculation unit for calculating an inclination degree which shows the degree of inclination of the structure on the basis of the difference between the temperature of the first site and the temperature of the second site and the measured value of the inclination angle.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gradient calculating device, a structure and a program.

2. Description of the Related Art There is known a sensor device that monitors a mounting state of a mounting member that fixes a structure to a ceiling portion in a tunnel with a hanging structure (for example, see Patent Document 1).
Patent Document 1 Japanese Patent Laid-Open No. 2015-111091

  The slope of a structure may be affected by temperature differences in the structure. Therefore, there is a problem that the degree of inclination of the structure cannot be correctly evaluated only by the inclination angle of the structure measured by the inclination sensor. For example, if the measured value of the inclination angle is used to evaluate the degree of deterioration of the structural performance of the structure, the evaluation result may be affected by the temperature difference.

  In the first aspect, a gradient calculating device is provided. The gradient calculating device obtains the temperature of the first portion of the structure obtained by the first temperature sensor and the temperature of the second portion of the structure obtained by the second temperature sensor. Section. The inclination degree calculation device may include an inclination angle acquisition unit that acquires a measurement value of the inclination angle of the structure obtained by the first inclination sensor. The gradient calculating device includes a calculator that calculates a gradient indicating the degree of inclination of the structure based on the difference between the temperature of the first part and the temperature of the second part and the measured value of the tilt angle. You may.

  The inclination degree calculating device may further include a storage unit that stores the inclination angle generated in the structure due to the temperature difference between the first portion and the second portion in association with the temperature difference. The calculating unit calculates the degree of inclination based on the difference between the inclination angle stored in the storage unit and the measured value of the inclination angle in association with the difference between the temperature of the first portion and the temperature of the second portion. It may be calculated.

  The calculator may calculate the inclination degree further based on the ambient temperature of the structure.

  The first tilt sensor may measure a tilt angle with respect to a plane orthogonal to a line connecting the first part and the second part. The calculation unit, based on the difference between the temperature of the first part and the temperature of the second part, and the measured value of the inclination angle with respect to the plane orthogonal to the line connecting the first part and the second part, The degree of inclination indicating the degree of inclination of the structure with respect to the plane orthogonal to the line connecting the first portion and the second portion may be calculated.

  The structure may have a first columnar portion extending in the direction of gravity. The direction connecting the first part and the second part may be different from the direction of gravity. The first temperature sensor and the first temperature sensor may be provided on a side portion of the first columnar portion.

  The inclination angle acquisition unit may further acquire a measurement value of the inclination angle obtained by the second inclination sensor provided below the first columnar portion in the gravity direction. The first tilt sensor may be provided above the second tilt sensor in the gravity direction. The calculator calculates the difference between the temperature of the first portion and the temperature of the second portion, and the measured value of the inclination angle obtained by the first inclination sensor and the inclination angle obtained by the second inclination sensor. The gradient may be calculated based on the difference from the measured value.

  The structure may further include a second columnar section extending from the first columnar section in a direction different from the gravity direction. The inclination angle acquisition unit may further acquire a measurement value of the inclination angle obtained by the third inclination sensor for measuring the inclination angle of the second columnar section. The calculation unit further calculates the tilt angle of the second columnar portion based on the difference between the measured value of the tilt angle obtained by the third tilt sensor and the measured value of the tilt angle obtained by the first tilt sensor. It may be calculated.

  The calculating unit may calculate the inclination degree based on the wind speed obtained by the wind speed sensor and the inclination angle of the structure generated by the wind on the structure.

  The gradient calculating device delays the measured value of the temperature of the first part obtained by the first temperature sensor and the measured value of the temperature of the second part obtained by the second temperature sensor. A delay processing unit may be further provided. The calculation unit calculates the difference between the temperature of the first portion obtained by performing the delay processing and the temperature of the second portion subjected to the delay processing and the inclination angle obtained by the first inclination sensor. The gradient may be calculated based on the measured value.

  The delay processing may include at least one of first-order delay processing and dead time processing.

  The gradient calculating device may further include a first temperature sensor, a second temperature sensor, and a first inclination sensor.

  In a second aspect, a structure is provided. The structure may include the above-described inclination degree calculating device.

  In a third aspect, a computer is provided. The program causes the computer to acquire the temperature of the first portion of the structure obtained by the first temperature sensor and the temperature of the second portion of the structure obtained by the second temperature sensor. May function as a department. The program may cause the computer to function as an inclination angle acquisition unit that acquires a measurement value of the inclination angle of the structure obtained by the first inclination sensor. The program causes the computer to function as a calculator that calculates a degree of inclination indicating the degree of inclination of the structure based on the difference between the temperature of the first portion and the temperature of the second portion and the measured value of the inclination angle. You may.

  The above summary of the invention does not enumerate all the features of the present invention. Further, a sub-combination of these feature groups can also be an invention.

1 shows an overall configuration of a monitoring system 100 according to an embodiment. A state in which the structure 80 is inclined due to a temperature difference is schematically shown. 1 schematically shows a functional configuration of a collecting device 20. The functional structure of the temperature difference calculation unit 312 is schematically shown. 6 is a graph showing an example of temperature dependence of a tilt angle correction value with respect to an angle θ with respect to temperature. The inclination angle correction value data regarding the temperature is shown in a table format. The inclination angle correction value data regarding the wind speed is shown in a table format. The time change of a measured value and a grade is shown. 3 shows a flowchart regarding data processing executed in the collection device 20.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Moreover, not all combinations of the features described in the embodiments are essential to the solving means of the invention.

  FIG. 1 shows the overall configuration of a monitoring system 100 according to an embodiment. The monitoring system 100 includes a structure 80, a structure 81, a structure 82, and a server 70. The monitoring system 100 monitors physical quantities regarding the structure 80, the structure 81, and the structure 82. The monitoring system 100 of this embodiment is a structure health monitoring system. For example, the monitoring system 100 monitors the physical quantity regarding the structure 80, the structure 81, and the structure 82, and diagnoses the structural performance of each of the structure 80, the structure 81, and the structure 82.

  In the present embodiment, the structure 80, the structure 81, and the structure 82 are road information bulletin boards. The monitoring system 100 continuously or intermittently monitors the inclination angles of the structures 81 and 82, and detects an abnormality that has occurred in each structure based on the evaluation value based on the inclination angle. The abnormality is, for example, a decrease in strength of the base of the structure, loosening of bolts for fixing the structure, decrease in strength due to fatigue of the structure, damage due to external force, and the like.

  The structure 80 includes a column 210, a column 220, a base plate 230, and a display plate 240. The structure 80 is installed on a road 110 such as a highway or an urban road. The structure 80 is a cantilever type and is installed on the roadside or the like. The base plate 230 is fixed to a foundation such as concrete with anchor bolts or the like. The column 210 is fixed to the base plate 230. The pillar 210 extends vertically upward from the ground. The column 220 extends from the column 210 in a direction substantially orthogonal to the vertical direction. The display plate 240 is fixed to the column 220. The display plate 240 displays information on traffic conditions, road conditions, tunnels, and the like.

  The structure 80 includes the collecting device 20, the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43, the temperature sensor 30, the temperature sensor 31, the temperature sensor 32, the temperature sensor 33, and the temperature sensor 34, and the wind direction wind speed sensor 50. An inclination calculation device is provided.

  The acceleration sensor 41 is provided on the upper portion of the column 210 in the longitudinal direction. The acceleration sensor 41 may be provided on the upper end of the column 210 in the vertical direction. The acceleration sensor 42 is provided below the support column 210. The acceleration sensor 42 may be provided at the lower end of the column 210 in the vertical direction. The acceleration sensor 42 may be provided on the base plate 230. The acceleration sensor 43 is provided on the display plate 240. The acceleration sensor 43 may be provided on the column 220. The acceleration sensor 43 may be provided at an end portion on the opposite side of the support column 210 in the extending direction of the support column 220. The acceleration sensor 43 is an acceleration sensor for measuring the inclination of the column 220.

  The temperature sensor 31 and the temperature sensor 32 are provided on the column 210 and measure the temperature of the column 210. The temperature sensor 33 and the temperature sensor 34 are provided on the column 220 and measure the temperature of the column 220. The temperature sensor 31, the temperature sensor 32, the temperature sensor 33, and the temperature sensor 34 are, for example, thermocouples, and are directly attached so as to contact the columns. The temperature sensor 30 detects the temperature around the structure 80. The wind direction wind speed sensor 50 detects the wind direction and the wind speed.

  The acceleration sensor 41, the acceleration sensor 42, the acceleration sensor 43, the temperature sensor 30, the temperature sensor 31, the temperature sensor 32, the temperature sensor 33, the temperature sensor 34, and the wind direction wind speed sensor 50 are connected via a communication line such as an Ethernet (registered trademark) cable. It is connected to the collecting device 20.

  The collection device 20 collects the measurement values of the acceleration sensor 41, the acceleration sensor 42, the acceleration sensor 43, the temperature sensor 30, the temperature sensor 31, the temperature sensor 32, the temperature sensor 33, the temperature sensor 34, and the wind direction wind speed sensor 50. The collection device 20 calculates the inclinations of the support column 210 and the support column 220 based on the measured acceleration values collected from the acceleration sensors. Then, the collection device 20 detects the measured values of the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43, and the temperature sensor 30, the temperature sensor 31, the temperature sensor 32, the temperature sensor 33, the temperature sensor 34, and the wind direction wind speed sensor 50. The measured value is used to calculate the degree of inclination indicating the degree of inclination of each of the columns 210 and 220. The collection device 20 evaluates the structural performance of the structure 80 based on the inclination. For example, the collecting apparatus 20 evaluates that the higher the inclination is, the more the structure 80 is deteriorated. When the gradient is equal to or higher than a predetermined threshold value, the collection device 20 transmits warning information, measurement data indicating time-series measurement values, and gradient through the network 90.

  When the server 70 receives the warning information from the collection device 20, the server 70 analyzes the structure 80 based on the measurement data. For example, the server 70 determines the degree of safety of the structure 80 by comparing the measurement data of the structure 80 at the time of construction with the current measurement data. The server 70 warns the operator of the structure 80 when the safety level is lower than a predetermined value.

  FIG. 2 schematically shows how the structure 80 is inclined due to the temperature difference. FIG. 2A shows a standard installation state of the structure 80. In the standard installation state, the longitudinal direction of the support column 210 coincides with the vertical direction. The longitudinal direction of the column 220 is orthogonal to the vertical direction. In the description of the present embodiment, the direction of the structure 80 may be described using a fixed rectangular coordinate system in which the vertical direction is the z-axis direction and the extending direction of the support column 220 in the standard installation state is the x-axis direction. is there. The standard installation state may be the installation state at the time of construction of the structure 80.

  The acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43 are each a triaxial acceleration sensor. The acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43 may each be a MEMS type acceleration sensor. Each of the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43 has a movable electrode that can be displaced by acceleration, and outputs an acceleration signal based on a capacitance that changes according to the displacement of the movable electrode. In the acceleration signals output by the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43, the DC component indicates the tilt angle and the AC component indicates the vibration component. The acceleration signal measured by each of the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43 has three-axis components of an X-axis component, a Y-axis component, and a Z-axis component.

  The acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43 are calibrated so that the acceleration measured in the standard installation state falls within a predetermined range. For example, the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43 are calibrated so that the X-axis component and the Y-axis component of the acceleration measured in the reference installation state are zero. In the standard installation state, the X-axis of each acceleration sensor matches the x-axis of the fixed coordinate system, the Y-axis of each acceleration sensor matches the y-axis of the fixed coordinate system, and the Z-axis of each acceleration sensor corresponds to the fixed coordinate system. It is supposed to coincide with the z axis.

  In the description of the present embodiment, unless otherwise specified, the measured values of the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43 indicate the tilt angle calculated from the acceleration signal. Further, particularly in FIG. 2, an angle θ formed by the x-axis of the fixed coordinate system and the X-axis of the acceleration sensor 41 will be described.

  FIG. 2B schematically shows how the pillar 210 is inclined due to the temperature difference. For example, due to the effect of sunshine, a temperature difference occurs between the side of the structure 80 that is directly exposed to the sun and the side of the structure 80 that is not directly exposed to the sun. For example, the side where the sun hits directly becomes high temperature and the side where the sun does not hit directly becomes low temperature. As a result, there is a difference in the amount of expansion and contraction of the members that form the structure 80 between the side that is directly exposed to the sun and the side that is not directly exposed to the sun. As a result, the structure 80 is inclined.

  Specifically, as shown in FIG. 2B, when the sun is on the x-axis negative side of the structure 80, the expansion amount of the strut 210 is larger on the x-axis negative side than on the x-axis positive side, so that the strut is increased. 210 generally tilts in the x-axis plus direction. Therefore, the angle θ calculated from the measurement value of the acceleration sensor 41 is larger than 0 °. Such inclination can occur regardless of whether the structure 80 is deteriorated. Therefore, the temperature difference acts as a disturbance factor when evaluating the structural performance of the structure 80. Therefore, in order to more accurately evaluate the structural performance of the structure 80, the collection device 20 considers the temperature difference between the temperature sensor 31 provided on the minus side of the x-axis and the temperature sensor 32 provided on the plus side of the x-axis. Then, the inclination of the structure 80 is calculated.

  The angle θ can also change with changes in ambient temperature. For example, in the structure 80, the display plate 240 is supported in a cantilever manner at a position apart from the support column 210 in the x-axis direction. Therefore, when the ambient temperature rises and the Young's modulus of the column 210 decreases, the column 210 tilts in the x-axis direction and the angle θ increases.

  Generally, each member constituting the structure 80 expands / contracts in accordance with the coefficient of thermal expansion according to the temperature change. If the material forming each part of the structure 80 is different, the coefficient of thermal expansion of each part is also different. Therefore, unless the structure 80 is composed of a uniform material and has a symmetrical structure, the structure 80 may change its inclination due to a change in ambient temperature. Further, even if the structure 80 is made of a uniform material and has a symmetrical structure, if the structure 80 is installed so as to be tilted with respect to the gravity vector, the tilt changes due to a change in ambient temperature. obtain. Further, as described above, even if the structure 80 is made of a uniform material and has a symmetrical structure with respect to the gravity vector, the inclination may change due to the temperature difference.

  Further, the angle of the structure 80 can also be changed by the wind. For example, when the wind in the plus direction of the x-axis hits the structure 80, the support column 210 tilts in the x-axis direction, and the angle θ increases.

  As described above, the ambient temperature, the temperature difference, the influence of the wind, and the like may be a disturbance for the tilt measurement value. In order to simply eliminate these effects, for example, choose a case where the ambient temperature is approximately constant, there is almost no temperature difference, and the wind speed is small, and it is considered that there is no effect of disturbance at that time, and the conditions are met. It is conceivable to adopt only the tilt measurement value at that time. However, this method limits the opportunities to meet the conditions and may not be able to secure the necessary and sufficient amount of data, so more effective measures are necessary.

  The collection device 20 stores in advance tilt angle correction values according to the temperature difference, the ambient temperature, and the wind speed. The tilt angle correction value is used as information for correcting the evaluation value based on the tilt angle for evaluating the structural performance. The collecting device 20 calculates the degree of inclination using the inclination angle measured by the acceleration sensor 41 and the inclination angle correction values corresponding to the current temperature difference, the ambient temperature, and the wind speed.

  Similarly, the collecting device 20 also calculates the degree of inclination of the support column 220 using the inclination angle measured by the acceleration sensor 41 and the inclination angle correction values corresponding to the current temperature difference, the ambient temperature, and the wind speed. To do. The temperature difference for calculating the inclination degree of the column 220 is the temperature measured by the temperature sensor 33 provided on the positive side of the z axis and the temperature measured by the temperature sensor 34 provided on the negative side of the z axis. May be applied.

  The structures 81 and 82 are provided with the same inclination calculating device as the inclination calculating device included in the structure 80. Therefore, the description of the operation of the structure 81 and the inclination calculating device provided in the structure 82 is omitted.

  FIG. 3 schematically shows a functional configuration of the collecting device 20. The collection device 20 includes a processing unit 300, a memory 302, a storage device 304, a communication unit 306, a communication unit 308, and a bus 390. The processing unit 300, the memory 302, the storage device 304, the communication unit 306, and the communication unit 308 exchange data differently via the bus 390.

  The processing unit 300 controls the entire collection device 20. The processing unit 300 may be a processor. The memory 302 is a volatile memory. The processing unit 300 controls each unit of the collection device 20 using the information stored in the memory 302. The storage device 304 stores the program executed by the processing unit 300. The processing unit 300 controls each unit of the collection device 20 according to the program loaded from the storage device 304 to the memory 302. When the program is executed by the processing unit 300, the processing unit 300 functions as a temperature acquisition unit 310, a temperature difference calculation unit 312, a wind speed acquisition unit 320, an acceleration acquisition unit 330, a gradient calculation unit 340, and an evaluation unit 350. Let

  The communication unit 308 receives the respective measured values from the acceleration sensor 41, the acceleration sensor 42, the acceleration sensor 43, the temperature sensor 30, the temperature sensor 31, the temperature sensor 32, the temperature sensor 33, the temperature sensor 34, and the wind direction wind speed sensor 50. To do. In the processing unit 300, the acceleration acquisition unit 330 acquires the measurement values of the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43 via the communication unit 308. The temperature acquisition unit 310 acquires the measurement values of the temperature sensor 30, the temperature sensor 31, the temperature sensor 32, the temperature sensor 33, and the temperature sensor 34 via the communication unit 308. The wind speed acquisition unit 320 acquires the measurement value of the wind direction wind speed sensor 50 via the communication unit 308.

  The temperature acquisition unit 310 acquires the temperature of the first portion of the structure 80 obtained by the temperature sensor 31 and the temperature of the second portion of the structure 80 obtained by the temperature sensor 32. The acceleration acquisition unit 330 acquires the measurement value of the inclination angle of the structure 80 obtained by the acceleration sensor 41. The acceleration sensor 41 is an example of a first tilt sensor. The gradient calculating unit 340, based on the difference between the temperature of the first part and the temperature of the second part, and the measured value of the tilt angle by the acceleration sensor 41, the tilt indicating the degree of tilt of the structure 80. To calculate. Accordingly, it is possible to calculate the inclination degree in which the influence of the inclination angle generated on the support column 210 due to the temperature difference is reduced.

  Specifically, the temperature difference calculation unit 312 calculates the difference between the temperature of the first part and the temperature of the second part. The gradient calculating unit 340 calculates the gradient based on the temperature difference calculated by the temperature difference calculating unit 312 and the measured value of the tilt angle measured by the acceleration sensor 41. The processing of the temperature difference calculation unit 312 will be described with reference to FIG.

  The storage device 304 stores the inclination angle generated in the structure 80 due to the temperature difference between the first portion and the second portion in association with the temperature difference. The inclination degree calculation unit 340 associates the measured value of the inclination angle with the inclination angle stored in the storage device 304 in association with the difference between the temperature of the first portion and the temperature of the second portion. , The slope may be calculated.

  The gradient calculating unit 340 may calculate the gradient based on the ambient temperature of the structure 80. For example, the gradient calculating unit 340 may measure the inclination angle, the inclination angle generated in the structure 80 due to the difference between the temperature of the first portion and the temperature of the second portion, and the structure temperature according to the ambient temperature of the structure 80. The inclination degree may be calculated based on the inclination angle of the object 80. As the ambient temperature of the structure 80, the measurement value of the temperature sensor 30 may be applied. The temperature sensor 30 may be omitted, and one of the temperature measured by the temperature sensor 31 and the temperature measured by the temperature sensor 32 may be applied as the ambient temperature of the structure 80. The ambient temperature of the structure 80 may be acquired from an external server such as the server 70.

  The acceleration sensor 41 measures an inclination angle with respect to a plane orthogonal to a line connecting the first part and the second part. In the present embodiment, the plane orthogonal to the line connecting the first portion and the second portion is the yz plane. The gradient calculating unit 340 calculates the difference between the temperature of the first portion and the temperature of the second portion and the measured value of the inclination angle with respect to the plane orthogonal to the line connecting the first portion and the second portion. Based on this, the degree of inclination indicating the degree of inclination of the structure 80 with respect to the plane orthogonal to the line connecting the first portion and the second portion is calculated. The angle θ described above is an example of information indicating an inclination angle with respect to the yz plane.

  In the structure 80, the support column 210 is an example of a first columnar portion extending in the direction of gravity. The temperature sensor 31 and the temperature sensor 31 are provided on a side portion of the support column 210. That is, the direction connecting the first part and the second part is different from the direction of gravity. In this embodiment, the direction connecting the first part and the second part is orthogonal to the direction of gravity.

  The acceleration acquisition unit 330 acquires the measurement value of the tilt angle obtained by the acceleration sensor 42. The acceleration sensor 42 is provided above the acceleration sensor 41 in the gravity direction. The acceleration sensor 42 is an example of an acceleration sensor provided below the support column 210 in the direction of gravity. The inclination degree calculation unit 340 measures the difference between the temperature of the first portion and the temperature of the second portion, and the measured value of the inclination angle obtained by the acceleration sensor 41 and the inclination angle obtained by the acceleration sensor 42. The gradient is calculated based on the difference from the value. By calculating the degree of inclination based on the difference between the measurement value of the acceleration sensor 41 and the measurement value of the acceleration sensor 42, even if the inclination angle of the base plate 230 itself changes, for example, the inclination degree of only the column 210 is appropriately evaluated. be able to. For example, the inclination angle of the base plate 230 may change as a heavy vehicle passes near the structure 80. Even in such a case, the influence of the inclination of the base plate 230 on the inclination can be reduced.

  The column 220 extends from the column 210 in a direction different from the gravity direction. The support column 220 is an example of a second columnar section. The acceleration sensor 43 is provided on the display plate 240 fixed to the support column 220. The acceleration sensor 43 is an example of an inclination sensor for measuring the inclination angle of the column 220. The acceleration acquisition unit 330 acquires the measurement value of the tilt angle obtained by the acceleration sensor 43. The tilt degree calculation unit 340 calculates the tilt angle of the support column 220 based on the difference between the tilt angle measurement value obtained by the acceleration sensor 43 and the tilt angle measurement value obtained by the acceleration sensor 41. As a result, it is possible to reduce the influence of the inclination of the column 210 on the measurement result of the inclination angle of the column 220.

  The temperature acquisition unit 310 acquires the temperature of the third portion of the structure 80 obtained by the temperature sensor 33 and the temperature of the fourth portion of the structure 80 obtained by the temperature sensor 34. The inclination degree calculation unit 340 calculates the difference between the measured value of the inclination angle obtained by the acceleration sensor 43 and the measured value of the inclination angle obtained by the acceleration sensor 41, the temperature of the third portion, and the temperature of the fourth portion. The inclination degree indicating the degree of the inclination of the support column 220 may be calculated based on the difference between and. Accordingly, it is possible to calculate the inclination degree in which the influence of the inclination angle generated on the support column 220 due to the temperature difference is reduced.

  Further, the inclination calculating section 340 may calculate the inclination based on the wind speed obtained by the wind direction wind speed sensor 50 and the inclination angle of the structure 80 generated in the structure 80 by the wind. For example, the inclination degree calculating unit 340 may calculate the inclination degree of the support column 210 based on the wind speed obtained by the wind direction and wind speed sensor 50 and the inclination angle of the support column 210 caused by the wind on the support column 210. Further, the inclination degree calculation unit 340 may calculate the inclination degree of the support column 220 based on the wind speed obtained by the wind direction wind speed sensor 50 and the inclination angle of the support column 220 generated on the support column 220 by the wind.

  FIG. 4 schematically shows a functional configuration of the temperature difference calculation unit 312. The temperature difference calculation unit 312 includes a delay processing unit 400 and a subtraction unit 440. The delay processing unit 400 includes a dead time processing unit 410, a dead time processing unit 420, a first-order delay processing unit 412, and a first-order delay processing unit 422. In FIG. 4, the dead time processing unit 410, the dead time processing unit 420, the first-order delay processing unit 412, and the first-order delay processing unit 422 are shown by transfer functions.

  The delay processing unit 400 performs delay processing on the measured value of the temperature of the first portion obtained by the temperature sensor 31 and the measured value of the temperature of the second portion obtained by the temperature sensor 32.

  Specifically, the dead time processing unit 410 performs dead time processing on the measured value of the temperature of the first portion. L1 in FIG. 4 indicates the dead time of the dead time processing by the dead time processing unit 410. The first-order lag processing unit 412 performs the first-order lag processing on the measurement value subjected to the dead time processing by the dead time processing unit 410. T1 in FIG. 4 is a time constant of the primary delay processing by the primary delay processing unit 412.

  The dead time processing unit 420 performs dead time processing on the measured value of the temperature of the second portion. L2 in FIG. 4 indicates the dead time of the dead time processing by the dead time processing unit 420. The first-order lag processing unit 422 performs the first-order lag processing on the measurement value subjected to the dead time processing by the dead time processing unit 420. T2 in FIG. 4 is a time constant of the primary delay processing by the primary delay processing unit 422.

  Subtraction unit 440 subtracts the output of primary delay processing unit 422 from the output of primary delay processing unit 412. The output of the subtraction unit 440 is output to the temperature acquisition unit 310. Thereby, the gradient calculating unit 340 obtains the difference between the temperature of the first portion obtained by performing the delay processing and the temperature of the second portion subjected to the delay processing, and the acceleration sensor 41. The inclination degree can be calculated based on the measured value of the inclination angle.

  In general, there may be a time delay before the influence of the temperature change of the structure appears in the shape change of the entire structure. For example, even if the surface temperature of the structure rises, it takes time for the heat to be transferred to the inside of the structure and the structure to reach a thermal steady state. The time delay depends on the shape and size of the structure. Therefore, particularly in a large-scale structure having a large heat capacity, a time delay until the temperature change appears in the shape change of the structure can be significant. Therefore, the influence of the difference between the two measured values of the temperature sensor 31 and the temperature sensor 32 may not sufficiently appear in the tilt angle measured by the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43.

  In the temperature difference calculation unit 312, the delay processing unit 400 applies dead time processing or first-order delay processing to the temperature measurement value to reduce the influence of the time delay until the temperature difference appears in the inclination of the structure 80. can do. The dead time of the dead time processing and the time constant of the first-order lag processing described above may be calculated in advance by structural calculation of the structure 80, simulation, experiment, or the like. The delay processing by the delay processing unit 400 may include at least one of the first-order delay processing and the dead time processing. For example, the delay processing by the delay processing unit 400 may be only the dead time processing, and the delay processing by the delay processing unit 400 may be only the first-order delay processing.

  The processing of the delay processing unit 400 may be applied to the measurement value of the temperature sensor 33 and the measurement value of the temperature sensor 34. The time delay processing similar to the dead time processing unit 410 and the first-order delay processing unit 412 may be applied to the measurement value of the temperature sensor 30. For example, at least one of dead time processing and first-order delay processing may be applied to the measurement value of the temperature sensor 30. The gradient calculating unit 340 may calculate the gradient based on the temperature to which the time delay process is applied, in consideration of the inclination angle generated in the structure 80 by the temperature.

  FIG. 5 is a graph showing an example of the temperature dependence of the tilt angle correction value with respect to the angle θ. FIG. 5A is a graph showing the temperature difference dependency of the tilt angle correction value. Here, the temperature difference is the temperature difference ΔT between the portion where the temperature sensor 31 is provided and the portion where the temperature sensor 32 is provided. FIG. 5B shows the ambient temperature dependence of the tilt angle correction value.

  If the structure of the structure 80 is known, the relationship between the ambient temperature and the temperature difference and the angle θ is uniquely determined. The tilt angle correction value is calculated in advance by structural calculation of the structure 80, simulation, experiment, or the like. Further, the tilt angle correction value obtained by the structural calculation or the simulation may be corrected based on the actual measurement data. Data indicating the tilt angle correction value is stored in the collection device 20 in advance.

  FIG. 6 shows the inclination angle correction value data regarding the temperature in a table format. FIG. 6A is a temperature difference-inclination angle correction value table that associates the temperature difference ΔT with the inclination angle correction value Δθd. The data of the temperature difference-tilt angle correction value table is stored in the storage device 304. The inclination degree calculation unit 340 calculates the inclination angle correction value Δθd corresponding to the temperature difference ΔT calculated by the temperature difference calculation unit 312 with reference to the temperature difference-inclination angle correction value table.

  FIG. 6B is an ambient temperature-inclination angle correction value table that associates the ambient temperature T with the inclination angle correction value Δθe. The data of the ambient temperature-tilt angle correction value table is stored in the storage device 304. The inclination degree calculation unit 340 calculates the inclination angle correction value Δθe corresponding to the temperature T measured by the temperature sensor 30 with reference to the ambient temperature-inclination angle correction value table.

  FIG. 7 shows the inclination angle correction value data regarding the wind speed in a table format. FIG. 7 is a wind speed-tilt angle correction value table that associates the wind speed with the tilt angle correction value Δθs. Similar to the temperature and the temperature difference, if the structure of the structure 80 is known, the relationship between the wind speed and the angle θ is uniquely determined. The inclination angle correction value with respect to the wind speed is calculated in advance by structural calculation, simulation, experiment, and the like. The wind speed shown in FIG. 7 is assumed to be the wind speed in the x-axis direction.

  The data of the wind speed-tilt angle correction value table is stored in the storage device 304. The inclination degree calculation unit 340 calculates the inclination angle correction value Δθs corresponding to the wind speed measured by the wind direction wind speed sensor 50 with reference to the wind speed-inclination angle correction value table.

  The tilt degree calculation unit 340 calculates the tilt degree of the support column 210 by correcting the measurement value of the angle θ obtained by the acceleration sensor 41 based on the tilt angle correction values Δθd, Δθe, and Δθs. As an example, the gradient calculating unit 340 may calculate the gradient by θ− (α × Δθd + β × Δθe + γ × Δθs). α, β, and γ are predetermined weighting factors. As a result, the gradient is less likely to be affected by the temperature difference, the temperature, and the wind. Therefore, the deterioration of the structure 80 and the like can be evaluated more accurately by using the inclination.

  FIG. 8 shows changes in measured values and inclinations with time. In FIGS. 8A to 8D, the horizontal axis represents time. FIG. 8A shows the measured value of the tilt angle obtained by the acceleration sensor 41. FIG. 8B shows the measured value of the temperature obtained by the temperature sensor 30. FIG. 8C shows the difference between the temperature obtained by the temperature sensor 31 and the temperature obtained by the temperature sensor 32. FIG.8 (d) shows the inclination degree calculated based on the measured value of the inclination angle.

  In FIG. 8D, the gradient 800 indicates the gradient in consideration of the angle correction value Δθd corresponding to the temperature difference ΔT and the angle correction value Δθe corresponding to the temperature T. On the other hand, the inclination 810 indicates the inclination considering only the angle correction value Δθe corresponding to the temperature T. As shown in FIG. 8D, the swing width of the slope degree 800 is smaller than the swing width of the slope degree 810. Therefore, it is understood that the inclination degree can be evaluated more appropriately by applying the angle correction value Δθd according to the temperature difference ΔT.

  In addition, in the description of FIGS. 5 to 8, the inclination degree is mainly described by taking the angle θ of the support column 210 as an example of the inclination angle of the structure 80. Further, the influence of the wind has been described by taking the inclination angle generated in the structure 80 by the wind in the x-axis direction. However, with respect to the angle ψ formed by the Y axis of the acceleration sensor 41 with respect to the y axis of the fixed coordinate system, the inclination degree of the angle ψ can be calculated by applying the same process as the angle θ. In this case, as the temperature difference, a pair of temperature sensors may be provided on different side surfaces in the y-axis direction, and an inclination angle generated in the structure 80 due to the difference in the measured values of the pair of temperature sensors may be considered. Further, as the influence of the wind, the tilt angle generated in the structure 80 by the wind in the y-axis direction may be considered.

  Further, in the standard installed state, the column 220 extends in the x-axis direction. Therefore, the column 220 can be tilted around the x-axis due to a temperature difference or the like generated on the side surface of the column 220. Therefore, the inclination calculating unit 340 determines the inclination about the angle ψ formed by the Y axis of the acceleration sensor 41 with respect to the y axis of the fixed coordinate system and the Z axis of the acceleration sensor 41 with respect to the z axis of the fixed coordinate system. The inclination with respect to the formed angle φ may be calculated. The inclination of the column 220 can be calculated by applying the same method as the method of calculating the inclination of the column 210, except that the direction of inclination is different. Therefore, detailed description of the method of calculating the inclination of the column 220 is omitted.

  FIG. 9 shows a flowchart regarding data processing executed in the collection device 20. The process of the flowchart in FIG. 9 is executed mainly by the operation of each unit of the collection device 20 under the control of the processing unit 300. The processing unit 300 repeats the processing shown in this flowchart each time measurement data at each time is transmitted from each sensor.

  In S902, the processing unit 300 acquires the measured value of the inclination angle, the measured value of the temperature, and the measured value of the wind speed. Specifically, the acceleration acquisition unit 330, the temperature acquisition unit 310, and the wind speed acquisition unit 320 measure the angles measured by the acceleration sensor 41, the acceleration sensor 42, and the acceleration sensor 43, and the temperature sensor 30, the temperature sensor 31, and the temperature sensor. The measured values of the temperature by the temperature sensor 32, the temperature sensor 33, and the temperature sensor 34 and the measured values of the wind direction and the wind speed by the wind direction wind speed sensor 50 are acquired.

  In S904, the temperature difference calculation unit 312 calculates the temperature difference ΔT of the support column 210 and the temperature difference ΔT of the support column 220. Specifically, the temperature difference calculation unit 312 obtains the difference between the temperature obtained by the temperature sensor 31 and the temperature obtained by the temperature sensor 32, and the temperature obtained by the temperature sensor 33 and the temperature sensor 34. Calculate the difference from the temperature.

  In step S906, the inclination calculating unit 340 calculates the inclination of each of the columns 210 and 220. Specifically, the tilt degree calculation unit 340 calculates the tilt degree about the angle θ and the tilt degree about the angle ψ for the support column 210. Further, the tilt degree calculation unit 340 calculates the tilt degree for the angle ψ and the tilt degree for the angle φ for the column 220.

  In S908, the storage device 304 stores the measured values acquired in S902 and the inclinations of the columns 210 and 220 calculated in S906 in association with the time.

  In S910, the evaluation unit 350 uses the inclination calculated in S906 as an evaluation value to evaluate the quality of the structure of the structure 80. Specifically, the evaluation unit 350 determines that a defect is generated when at least one of the inclination degree about the angle θ and the inclination degree about the angle ψ of the support column 210 is equal to or larger than a predetermined threshold value. In addition, the evaluation unit 350 determines that there is a defect when at least one of the inclination degree about the angle ψ and the inclination degree about the angle φ of the support column 220 is equal to or larger than a predetermined threshold value. On the contrary, when the inclination degree of the pillar 210 with respect to the angle θ and the inclination degree with respect to the angle ψ, and the inclination degree of the pillar 220 with respect to the angle ψ and the inclination degree of the angle φ are both less than a predetermined threshold value. , Judged as good.

  If the determination result of S910 is bad, in S912, the warning information indicating the structural failure, the measurement value and the inclination degree stored in the storage device 304 are transmitted to the server 70 through the communication unit 306, and the processing of this flowchart is performed. finish. If the result of the determination in S910 is good, the process of this flowchart ends.

  According to the monitoring system 100 described above, it is possible to calculate the inclination degree in consideration of the influence of the temperature difference in the structure. Therefore, it is possible to calculate the gradient that is less affected by the temperature difference. It is possible to appropriately evaluate the structural performance of the structure. Accordingly, it is possible to suppress a difference in the evaluation value of the deterioration state of the structure 80 between the time zone in which the temperature difference is large, such as during fine weather in the midsummer, and the time zone in which the temperature difference is small in cloudy weather or at night. it can.

  In the monitoring system 100 described above, the sunshine state is taken up and explained as the cause of the temperature difference. However, the temperature difference may occur in the structure 80 due to various heat sources other than the sun. For example, when the heat source is near the structure 80, the temperature of the structure 80 is high in a portion near the heat source and is low in a portion distant from the heat source, which may cause a large temperature difference. According to the monitoring system 100, it is possible to calculate an appropriate inclination degree for evaluating the structural performance in consideration of the influence of the temperature difference generated in the structure 80 regardless of the type of heat source.

  Note that the number of temperature sensors provided in the structure 80 is not limited to the above number. The number of temperature sensors may be set according to the required accuracy in the degree of inclination. By providing a large number of temperature sensors on the structure 80, the temperature distribution of the structure 80 can be obtained. The accuracy of the gradient can be improved by calculating the gradient based on the obtained temperature distribution.

  In the above description, the ambient temperature, the temperature difference, and the wind are mainly taken as the disturbance factors of the inclination angle for diagnosing the deterioration of the structure. The inclination angle may change due to various disturbance factors such as traffic vibration and shaking due to an earthquake in addition to the ambient temperature, the temperature difference, and the wind. Therefore, the evaluation unit 350 may calculate the gradient based on each measurement value in consideration of the disturbance factor. For example, the evaluation unit 350 may calculate the degree of inclination by using a measurement value at a timing when the magnitude of shaking due to traffic vibration or earthquake is smaller than a predetermined value.

  In the monitoring system 100, the collecting device 20 calculates the degree of inclination and determines the quality of the structure based on the degree of inclination. In another embodiment, the collecting device 20 may calculate the inclination, and the server 70 may determine the quality of the structure based on the inclination. In still another embodiment, the collection device 20 may transmit the collected measurement values to the server 70, and the server 70 may calculate the inclination and judge the quality of the structure.

  In the above embodiment, the case where the structure 80, the structure 81, and the structure 82 are road information bulletin boards is illustrated. The structure 80, the structure 81, and the structure 82 may be various works other than the road information bulletin board. The structure 80, the structure 81, and the structure 82 are, for example, steel towers, piers, telephone poles, power poles, overhead contact poles, lighting towers, advertising towers, sign towers, traffic lights, buildings, tunnels, roads, guardrails, and airports. It may include control towers, airfield lighthouses, stations, railroad rails, railroad traffic lights, port cranes, plants, steel bridges, dams, levees, gates, fences, tunnels, ditches and the like. The structure 80, the structure 81, and the structure 82 may be structures other than the workpiece, such as earth structures. The monitoring system 100 can be particularly suitably applied to a columnar structure having a height dimension larger than a horizontal dimension.

  Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various changes or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiment added with such changes or improvements can be included in the technical scope of the present invention.

  The execution order of each process such as operations, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is "preceding" or "prior to prior". It should be noted that the output of the previous process can be realized in any order unless it is used in the subsequent process. The operation flow in the claims, the specification, and the drawings is described by using “first,” “next,” and the like for the sake of convenience, but it is essential that the operations are performed in this order. Not a thing.

20 collection device 30, 31, 32, 33, 34 temperature sensor 41, 42, 43 acceleration sensor 50 wind direction wind speed sensor 70 server 80, 81, 82 structure 90 network 100 monitoring system 110 road 210, 220 support 230 base plate 240 display board 300 Processing unit 302 Memory 304 Storage device 306 Communication unit 308 Communication unit 310 Temperature acquisition unit 312 Temperature difference calculation unit 320 Wind speed acquisition unit 330 Acceleration acquisition unit 340 Gradient calculation unit 350 Evaluation unit 390 Bus 400 Delay processing unit 410, 420 Dead time Processing units 412, 422 Primary delay processing unit 440 Subtraction units 800, 810 Slope

Claims (13)

A temperature acquisition unit that acquires the temperature of the first portion of the structure obtained by the first temperature sensor and the temperature of the second portion of the structure obtained by the second temperature sensor;
An inclination angle acquisition unit that acquires a measurement value of the inclination angle of the structure obtained by the first inclination sensor,
A tilt degree including a calculator that calculates a tilt degree indicating a degree of tilt of the structure based on a difference between a temperature of the first portion and a temperature of the second portion and a measured value of the tilt angle. Calculator. A storage unit that stores a tilt angle generated in the structure due to a temperature difference between the first portion and the second portion in association with the temperature difference,
The calculation unit is based on a difference between the measured value of the inclination angle and the inclination angle stored in the storage unit in association with the difference between the temperature of the first portion and the temperature of the second portion. The inclination degree calculating device according to claim 1, wherein the inclination degree is calculated. The gradient calculating device according to claim 1, wherein the calculator further calculates the gradient based on an ambient temperature of the structure. The first inclination sensor measures an inclination angle with respect to a plane orthogonal to a line connecting the first portion and the second portion,
The calculation unit measures a difference between a temperature of the first portion and a temperature of the second portion, and an inclination angle with respect to a plane orthogonal to a line connecting the first portion and the second portion. The inclination degree indicating the degree of inclination of the structure with respect to a plane orthogonal to a line connecting the first portion and the second portion is calculated based on the value. The inclination calculation device described. The structure has a first columnar portion extending in the direction of gravity,
The direction connecting the first part and the second part is different from the direction of gravity,
The inclination degree calculating device according to claim 4, wherein the first temperature sensor and the first temperature sensor are provided on a side portion of the first columnar portion. The inclination angle acquisition unit further acquires a measurement value of an inclination angle obtained by a second inclination sensor provided below the first columnar portion in the gravity direction,
The first tilt sensor is provided above the second tilt sensor in the direction of gravity,
The calculator calculates the difference between the temperature of the first part and the temperature of the second part, and the measured value of the tilt angle obtained by the first tilt sensor and the second tilt sensor. The inclination degree calculating device according to claim 5, wherein the inclination degree is calculated based on a difference between the obtained inclination angle and a measured value. The structure further has a second columnar portion extending from the first columnar portion in a direction different from the gravity direction,
The tilt angle acquisition unit further acquires a measurement value of the tilt angle obtained by a third tilt sensor for measuring the tilt angle of the second columnar portion,
The calculation unit may further include the second tilt sensor based on a difference between a measured value of the tilt angle obtained by the third tilt sensor and a measured value of the tilt angle obtained by the first tilt sensor. The inclination degree calculating device according to claim 6, which calculates an inclination angle of the columnar portion. The calculation unit calculates the inclination degree further based on a wind speed obtained by a wind speed sensor and an inclination angle of the structure generated in the structure by wind. The inclination calculation device described. Delay processing for delaying the measured value of the temperature of the first portion obtained by the first temperature sensor and the measured value of the temperature of the second portion obtained by the second temperature sensor More parts,
The calculator calculates a difference between a temperature of the first part obtained by performing the delay process and a temperature of the second part that is subjected to the delay process, and the first inclination sensor. The inclination degree calculating device according to claim 1, wherein the inclination degree is calculated based on the obtained measured value of the inclination angle. The gradient calculating device according to claim 9, wherein the delay process includes at least one of a first-order delay process and a dead time process. The first temperature sensor;
The second temperature sensor;
The inclination degree calculating device according to claim 1, further comprising: the first inclination sensor. A structure comprising the inclination degree calculating device according to claim 1. On the computer,
A temperature acquisition unit that acquires the temperature of the first portion of the structure obtained by the first temperature sensor and the temperature of the second portion of the structure obtained by the second temperature sensor,
An inclination angle acquisition unit that acquires a measurement value of the inclination angle of the structure obtained by the first inclination sensor,
To function as a calculator that calculates a degree of inclination indicating the degree of inclination of the structure based on the difference between the temperature of the first portion and the temperature of the second portion and the measured value of the inclination angle. program.

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