JP4460494B2 - Earthquake evaluation method and earthquake evaluation apparatus - Google Patents

Description

  The present invention relates to an earthquake evaluation method and an earthquake evaluation apparatus for evaluating the magnitude of an earthquake based on vibration.

  In the present invention, a short period ground motion means a ground motion in which a large speed response is distributed in a speed response spectrum period of 2.5 sec or less, whereas a long period ground motion exceeds a speed response spectrum period of 2.5 sec. It means a vibration with a large velocity response in the range.

  In recent years, earthquake evaluation methods for evaluating the magnitude of earthquakes have been put into practical use. In the conventional earthquake evaluation method, the acceleration of the vibration and the spectrum intensity of the velocity response spectrum, so-called SI value, are calculated based on the vibration. In the earthquake evaluation method, the magnitude of the earthquake is evaluated based on whether or not the acceleration and SI value are equal to or greater than a predetermined threshold. The earthquake evaluation device activates a shut-off valve such as a gas pipe and an alarm device based on the evaluation of this earthquake evaluation method (see, for example, Patent Document 1).

Japanese Patent No. 3314912

  FIG. 20 is a graph showing a velocity response spectrum of a building at a certain point due to a simulated wave of the Tonankai earthquake (attenuation rate 5%). FIG. 21 is a graph showing a velocity response spectrum of a building at a certain point due to a simulated wave of the Tonankai earthquake (attenuation rate 2%). FIG. 22 is a graph showing a velocity response spectrum of a building at a certain point due to a simulated wave of the Nankai earthquake (attenuation rate 5%). FIG. 23 is a graph showing a velocity response spectrum of a building at a certain point due to a simulated wave of the Nankai earthquake (attenuation rate 2%). In FIGS. 20 to 23, the horizontal axis indicates the period (sec) of the building, and the vertical axis indicates the maximum value (cm / sec) of the speed response. 20-23, the thick solid line shows the velocity response spectrum by the simulated wave A of each earthquake, the thin solid line shows the notification wave B on the engineering base, and the dotted line shows the notification wave C on the surface layer.

  Part of the velocity response spectrum of the Tonankai and Nankai earthquakes is larger than the notification wave B in the engineering base with a period of 3 seconds or more. As shown in FIG. 23, the velocity response spectrum of the Nankai earthquake becomes partly larger than the notification wave C on the surface layer when the building attenuation rate is 2%. In other words, in the Tonankai and Nankai earthquakes, it is predicted that long-period ground motion with a large velocity response distributed over a period of 3 seconds or more can occur. Moreover, the acceleration of the vibration in these earthquakes is predicted to be 130 Gal or more and 200 Gal or less in the Tonankai earthquake, and 60 Gal or more and 90 Gal or less in the Nankai earthquake. The SI value is an evaluation with respect to the spectrum intensity of a speed response spectrum with a period of 0.1 sec to 2.5 sec, and a speed response spectrum with a period exceeding 2.5 sec is not targeted. Therefore, in long-period ground motion such as Tonankai and Nankai earthquakes, the SI value is predicted to be small.

  A conventional earthquake evaluation method evaluates the magnitude of an earthquake depending on whether the acceleration and the SI value of a vibration are equal to or greater than a threshold value. In the conventional seismic evaluation method, for example, the threshold of acceleration of vibration is set to 200 Gal, and the SI value of vibration is set to 30 kine. Although the conventional seismic evaluation apparatus method can accurately evaluate short-period ground motion, long-period ground motion with acceleration and SI values smaller than the threshold, such as Tonankai and Nankai earthquakes, is evaluated as a small-scale earthquake. . Therefore, in the Tonankai and Nankai earthquakes, the shut-off valves and alarms do not operate, and if the building continues to shake for a long time in this state, the gas pipe may be damaged, causing serious damage. . In addition to such a large earthquake, if the building continues to shake for a long time due to the earthquake, the gas pipe may be damaged, causing serious damage.

  An object of the present invention is to provide an earthquake evaluation method and an earthquake evaluation apparatus capable of evaluating an earthquake according to actual damage.

式（１）で演算されるスペクトル強度ＳＳＩであり、
周期βは、０secを越え、周期γ未満の値であり、
周期γは、２．５secを越える値であることを特徴とする地震評価方法である。 The present invention includes a detection step for detecting vibrations,
A calculation process for calculating a calculation value for evaluating the earthquake based on the vibration detected in the detection process;
A level discriminating step for discriminating the level of the calculation value calculated in the calculation step at a predetermined first discrimination level corresponding thereto;
A determination step of determining whether or not the calculated value is equal to or higher than a first discrimination level and continues for a predetermined duration or more,
The level discrimination step further discriminates the calculated value at a predetermined second discrimination level that is a level greater than the first discrimination level,
The determination step further determines whether or not the calculated value is equal to or higher than a second discrimination level ,
The calculated value is at least one of acceleration, velocity of vibration, and spectrum intensity of velocity response spectrum,
The spectrum intensity is a spectrum intensity SSI of a speed response spectrum Sv having a predetermined period β or more and a predetermined period γ or less, and is based on a period τ which is a variable of the speed response spectrum Sv and the speed response speckle Sv.

Is the spectral intensity SSI calculated by equation (1),
The period β is a value exceeding 0 sec and less than the period γ,
The period γ is a seismic evaluation method characterized by a value exceeding 2.5 sec .

式（１）で演算されるスペクトル強度ＳＳＩであり、
周期βは、０secを越え、周期γ未満の値であり、
周期γは、２．５secを越える値であることを特徴とする地震評価装置である。 The present invention also includes a detecting means for detecting a vibration,
An arithmetic means for calculating an arithmetic value for evaluating the earthquake based on the vibration detected by the detecting means;
Level discriminating means for discriminating the calculated value calculated by the calculating means at a predetermined first discrimination level corresponding thereto;
Determining means for determining whether or not the calculated value is equal to or higher than a first discrimination level for a predetermined duration or more;
The level discriminating means further discriminates the calculated value at a predetermined second discrimination level which is a level larger than the first discrimination level,
The determination means further determines whether or not the calculated value is equal to or higher than a second discrimination level,
The calculated value is at least one of acceleration, velocity of vibration, and spectrum intensity of velocity response spectrum,
The spectrum intensity is a spectrum intensity SSI of a speed response spectrum Sv having a predetermined period β or more and a predetermined period γ or less, and based on a period τ that is a variable of the speed response spectrum Sv and the speed response speckle Sv.

Is the spectral intensity SSI calculated by equation (1),
The period β is a value exceeding 0 sec and less than the period γ,
The period γ is a seismic evaluation apparatus characterized by a value exceeding 2.5 sec .

Or the present invention is characterized by further comprising an informing means for informing the calculated value.

According to the present invention, a calculation value for evaluating an earthquake is calculated based on the detected vibration. It is determined whether or not the calculated value is equal to or higher than the first discrimination level for the duration or longer. Therefore, it is possible to detect a vibration that has a small calculation value for evaluating an earthquake and cannot be evaluated by a conventional earthquake evaluation method and that continues for a long time. As a result, when a tremor that has a small calculated value and continues for a long time occurs, the tremor can be detected and a shut-off valve, an alarm device, and the like can be activated. Therefore, if the calculated value is small and the vibration continues for a long time, it can be detected reliably and the flow of gas etc. can be shut off early, which is more secondary damage than the conventional earthquake evaluation method. Can be reduced.

Furthermore, it is determined whether or not the calculated value for evaluating the earthquake is equal to or higher than the second discrimination level, which is a level higher than the first discrimination level. Since discrimination can be made at two levels, it is possible to detect a vibration that has a small calculated value for evaluating an earthquake and that continues for a long time, and a vibration that has a large calculated value that cannot be detected by a conventional earthquake evaluation apparatus. As a result, even if there is a vibration that has a small calculated value for evaluating an earthquake and that continues for a long time, or a vibration that has a large calculated value, these vibrations are detected, and a shut-off valve and alarm are detected. Can be activated.
Furthermore, the earthquake evaluation method can be realized by using at least one of the acceleration, velocity, and spectrum intensity of the velocity response spectrum for evaluating the earthquake as the calculation value.
Furthermore, the spectrum intensity is a spectrum intensity SSI of the speed response spectrum Sv having a predetermined period β or more and a predetermined period γ or less. Since the period γ is greater than 2.5 seconds, it is possible to detect long-period ground motions that are excluded from the evaluation target with the conventional SI value. Accordingly, when long-period ground motion continues for a long time, the shutoff valve and the alarm device can be operated based on the evaluation, and damage to gas pipes and the like disposed in the building can be prevented. As a result, the secondary damage can be reduced as compared with the conventional earthquake evaluation method.

Further, according to the present invention, the calculation value for evaluating the earthquake is calculated by the calculation means based on the vibration detected by the detection means. The level discriminating means discriminates the calculated value calculated by the calculating means at the first discrimination level corresponding thereto. The determination means determines whether or not the calculated value is equal to or higher than the first discrimination level for a duration or longer. Therefore, it is possible to detect a vibration that has a small calculation value for evaluating an earthquake and cannot be detected by a conventional earthquake evaluation apparatus and that continues for a long time. As a result, when a tremor that has a small calculated value and continues for a long time occurs, the tremor can be detected and a shut-off valve, an alarm device, and the like can be activated. Therefore, if the calculated value is small and the vibration continues for a long time, this can be detected reliably and the flow of gas etc. can be shut off early, which is more secondary than the conventional earthquake evaluation device. Damage can be reduced.

Further, the level discriminating means discriminates the calculated value at a second discrimination level that is a level higher than the first discrimination level. The determination means further determines whether or not the calculated value is equal to or higher than a second discrimination level. Since discrimination can be made at two levels, it is possible to detect a vibration that has a small calculated value for evaluating an earthquake and that continues for a long time, and a vibration that has a large calculated value that cannot be detected by a conventional earthquake evaluation apparatus. As a result, even if there is a vibration that has a small calculated value for evaluating an earthquake and that continues for a long time, or a vibration that has a large calculated value, these vibrations are detected, and a shut-off valve and alarm are detected. Can be activated.
Furthermore, the earthquake evaluation apparatus can be realized by using at least one of the acceleration, velocity, and spectrum intensity of the velocity response spectrum for evaluating the earthquake as the calculation value.
Furthermore, the spectrum intensity is a spectrum intensity SSI of the speed response spectrum Sv having a predetermined period β or more and a predetermined period γ or less. Since the period γ is greater than 2.5 seconds, it is possible to detect long-period ground motions that are excluded from the evaluation target with the conventional SI value. Accordingly, when long-period ground motion continues for a long time, the shutoff valve and the alarm device can be operated based on the evaluation, and damage to gas pipes and the like disposed in the building can be prevented. As a result, the secondary damage can be reduced as compared with the conventional earthquake evaluation apparatus.

  According to the invention, the notifying means notifies the calculated value. Thus, the user can know the calculated value and can evaluate the earthquake by visual recognition.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. Portions corresponding to the matters described in the preceding forms in each embodiment are denoted by the same reference numerals, and overlapping description may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination is not particularly troublesome.

  FIG. 1 is a block diagram showing an electrical configuration of the earthquake evaluation apparatus 1 according to the present embodiment. FIG. 2 is a front view showing the earthquake evaluation apparatus 1. FIG. 3 is an enlarged view showing the seismic device 2 included in the earthquake evaluation apparatus 1 in an enlarged manner. FIG. 4 is an enlarged cross-sectional view showing a part of the seismic device 2 in an enlarged manner. FIG. 5 is an enlarged perspective sectional view showing a part of the seismic device 2 in an enlarged manner. FIG. 6 is a graph showing acceleration of vibration. The earthquake evaluation device 1 is a device that evaluates the magnitude of the earthquake based on the vibration and activates the shut-off valve 3, the alarm unit 4 and the like based on the velocity evaluation. The earthquake evaluation device 1 is configured to measure, for example, a vibration of 30 Hz or less and to measure an acceleration of 3000 Gal or less. The earthquake evaluation apparatus 1 includes a housing 5, two seismic devices 2, a signal line 6, a control device 7, an operation unit 8, a display unit 9, a shut-off valve 3, and an alarm unit 4.

  The housing | casing 5 is formed in a rectangular parallelepiped box. However, the housing | casing 5 is not limited to a rectangular parallelepiped box, What is necessary is just a space formed inward. The two seismic devices 2 serving as detection means include an internal seismic device 2A and an external seismic device 2B. The internal seismic device 2 </ b> A is disposed inside the housing 5. The other external seismic device 2 </ b> B is disposed outside the housing 5. The internal and external seismic devices 2A and 2B have the same configuration. Therefore, in the following, the internal seismic device 2A will be described, and the configuration of the external seismic device 2B will be denoted by the same reference numerals as those of the internal seismic device 2A, and the description thereof will be omitted. The seismic device 2 is configured and arranged to be able to detect vibrations in the X direction and the Y direction, which are two horizontal directions orthogonal to each other. That is, the seismic device is configured to be able to detect horizontal biaxial vibration.

  The seismic sensor 2 includes a block body 10 and two sensors S1 and S2. The block body 10 is formed in a rectangular parallelepiped shape. The block body 10 is made of, for example, a metal material such as iron or aluminum or a synthetic resin material. The two sensors S1 and S2 are disposed on the mounting surface portions 11 and 12 of the block body 10 that are orthogonal to each other. Each of the sensors S1 and S2 is arranged in the block body 10 so that one sensor S1 can detect a vibration in the X direction and the other sensor S2 can detect a vibration in the Y direction. The two sensors S1, S2 have the same configuration. Therefore, one sensor S1 will be described, and the other sensor S2 will be denoted by the same reference numeral and description thereof will be omitted.

  The sensor S <b> 1 is an acceleration sensor that measures the acceleration of earthquake motion, and is electrically connected to the control device 7. The sensor S1 is, for example, a piezoelectric sensor, a servo sensor, a strain gauge sensor, or a capacitance sensor. In the present embodiment, a capacitive sensor is shown as an example of the sensor S1. However, the sensor S1 is not limited to the capacitive sensor, and may be at least the above-described sensor, or may be an acceleration sensor that measures the acceleration of seismic motion.

  The sensor S1 includes a pair of bases 13 and 14, a pair of glass plates 15 and 16, a pair of electrodes 17 and 18, a spacer 19, a mounting portion 20, and a pendulum 21. The pair of bases 13 and 14 is made of conductive single crystal silicon, and one surface portion is disposed to face each other in the first direction A1. The first direction A1 is synonymous with the X direction in one sensor S1, and is synonymous with the Y direction in the other sensor S2. Each base 13, 14 is formed with a protrusion 22 that protrudes from one surface portion toward the opposing base 14, 13. The pair of glass plates 15 and 16 are formed in a plate shape, and a connection hole 23 into which the protruding portion 22 can be inserted is formed. Each of the glass plates 15 and 16 is disposed on one surface portion of each of the bases 13 and 14 with the protruding portion 22 inserted through the connecting hole 23 and facing each other.

  The spacer 19 and the attachment portion 20 are made of conductive single crystal silicon and are interposed between the pair of glass plates 15 and 16. The spacer 19 and the mounting portion 20 are disposed at a distance from each other in the second direction A2 perpendicular to the first direction A1. The pair of electrodes 17 and 18 are formed in a thin film shape. The electrodes 17 and 18 are disposed on the glass plates 15 and 16 so as to face each other. The pair of electrodes 17 and 18 are formed, for example, by vapor-depositing aluminum on the glass plates 15 and 16. The pair of electrodes 17 and 18 are electrically and mechanically connected to the protrusion 22, that is, electrically connected to the bases 13 and 14.

  The pendulum 21 is a completely elastic body and is made of conductive single crystal silicon. The pendulum 21 is formed in a longitudinal shape extending in the second direction A2, and is disposed in a space 24 surrounded by the pair of electrodes 17, 18, the spacer 19, and the mounting portion 20. One end of the pendulum 21 in the longitudinal direction is integrally connected to the mounting portion 20, and the other end is a free end. In other words, the pendulum 21 is cantilevered by the mounting portion 20, and the other end portion is disposed so as to be swingable in the first direction A1. The pendulum 21 is disposed in a natural state in which the pendulum 21 does not swing with a distance d1, d2 from the pair of electrodes 17 and 18. In the present embodiment, the pendulum 21 is disposed so that the distances d1 and d2 between the pendulum 21 and the electrodes 17 and 18 shown in FIG. 4 are equal in the natural state. The signal line 6 electrically connects the pair of bases 13 and 14 and the pendulum 21 and the control device 7 of the sensor S1. The sensor S1 and the sensor S2 are electrically connected in parallel to the control device 7 by the signal line 6. Similarly, other acceleration sensors other than the capacitive sensor are also electrically connected to the control device 7 and configured to be able to transmit an electrical signal acquired by the acceleration sensor to the control device 7.

  The control device 7 includes a high-pass filter 25, a low-pass filter 32, an analog / digital converter (abbreviation: A / D converter) 31, three filters 33, an acceleration calculator 26, a speed calculator 27, and an SI value calculator 28. A storage unit 29 and a control unit 30 are included. The high pass filter 25 is electrically connected to the sensors S1 and S2 of the seismographs 2A and 2B via the signal line 6. The high pass filter 25 is electrically connected to the low pass filter 32. The high pass filter 25 has a function of blocking an electric signal having a low frequency, for example, an electric signal of 0.01 Hz or less. The low pass filter 32 is electrically connected to the A / D converter 31. The low-pass filter 32 has a function of blocking an electric signal having a high frequency based on a shock wave or the like, for example, an electric signal of 30 Hz or more.

  The A / D converter 31 is electrically connected to the three filters 33. The A / D converter 31 has a function of converting an analog signal into a digital signal. The three filters 33 are a first filter 33a, a second filter 33b, and a third filter 33c. The first filter 33 a is electrically connected to the acceleration calculation unit 26. The second filter 33 b is electrically connected to the speed calculation unit 27. The third filter 33 c is electrically connected to the SI value calculation unit 28.

  The acceleration calculation unit 26 is electrically connected to the control unit 30. The acceleration calculation unit 26 has a function of calculating the acceleration of the vibration based on the electrical signal transmitted from the sensors S1 and S2 of the seismic devices 2A and 2B through the high-pass filter 25 and the like. In the present embodiment, the acceleration calculation unit 26 acquires an electrical signal based on the capacitances C1 and C2 between the pendulum 21 and the electrodes 17 and 18. The acceleration calculation unit 26 has a function of calculating the pendulum acceleration, that is, the acceleration of the vibration based on the capacitances C1 and C2. In the present embodiment, the capacitors C1 and C2 are parallel capacitors of the sensors S1 and S2. Therefore, the calculated acceleration corresponds to the acceleration obtained by vector synthesis of the acceleration in the X direction component and the Y direction component. The first filter 33 a has a function of removing noise included in a signal transmitted from the A / D converter 31 to the acceleration calculation unit 26.

  The speed calculation unit 27 is electrically connected to the control unit 30. The speed calculation unit 27 has a function of calculating the speed of vibration based on an electrical signal transmitted from the sensors S1 and S2 of the seismic sensors 2A and 2B via the high-pass filter 25 and the like. In the present embodiment, the speed calculation unit 27 calculates the acceleration based on the capacitances C1 and C2 between the pendulum 21 and the electrodes 17 and 18, similarly to the acceleration calculation unit 26. The speed calculator 27 calculates the speed by integrating the acceleration. In the present embodiment, the capacitors C1 and C2 are parallel capacitors of the sensors S1 and S2. Therefore, the calculated speed corresponds to a speed obtained by vector synthesis of the speeds of the X direction component and the Y direction component. The second filter 33 b has a function of removing noise included in the signal transmitted from the A / D converter 31 to the speed calculation unit 27.

  The SI value calculation unit 28 is electrically connected to the control unit 30. The SI value calculation unit 28 has a function of calculating an SI value based on an electrical signal transmitted from the sensors S1 and S2 of the seismographs 2A and 2B through the high-pass filter 25 and the like. The SI value is a spectrum intensity SI of the speed response spectrum Sv having a period of 0.1 sec to 2.5 sec, and is calculated by the equation (2) using the speed response spectrum Sv and the period τ.

The SI value is a value obtained by integrating the speed response spectrum Sv with respect to the period τ in the range of the period of 0.1 sec to 2.5 sec and dividing the integrated value by 2.4.

  A specific calculation method will be described. The SI value calculation unit 28 calculates acceleration in the same manner as the acceleration calculation unit 26. Based on this acceleration, the SI value calculation unit 28 calculates 25 speed responses with a period from 0.1 sec to 2.5 sec in increments of 0.1 sec. The SI value calculation unit 28 detects the maximum value of the speed response in each cycle from the detection start to the current time. The SI value calculation unit 28 calculates the SI value by dividing the sum of the maximum values of the detected speed responses of each period by 2.4. In the present embodiment, the capacitors C1 and C2 are parallel capacitors of the sensors S1 and S2. Therefore, the SI value corresponds to the SI value of the speed response spectrum Sv obtained by vector synthesis of the speed response spectrum Sv of the X direction component and the Y direction component. The third filter 33 b has a function of removing noise included in the signal transmitted from the A / D converter 31 to the SI value calculation unit 28.

The control unit 30 that is a level discriminating unit and a determining unit is electrically connected to the storage unit 29, the display unit 9, the shutoff valve 3, the alarm unit 4, and the operation unit 8. The control unit 30 sets the maximum acceleration warning level Lα, the maximum value speed warning level LV, the maximum value SI value warning level LS, the acceleration duration warning level Mα, the speed duration warning level MV, the SI value duration warning level MS, and the predetermined duration T. Remember. In the present embodiment, when the maximum acceleration alarm level Lα, the maximum value speed alarm level LV, and the maximum value SI value alarm level LS are collectively referred to as the maximum value alarm level L, the acceleration continuous alarm level Mα, the speed continuous alarm level MV In addition, when the SI value continuous warning level MS is generically referred to, it may be referred to as a continuous warning level M. The maximum alarm level L corresponds to the second discrimination level, and the continuous alarm level M corresponds to the first discrimination level. The predetermined duration corresponds to the duration.

  The maximum acceleration warning level Lα is set higher than the acceleration continuous warning level Mα. The maximum value speed alarm level LV is set to be greater than the speed continuous alarm level MV. Maximum value SI value alarm level LS is set to be greater than SI value continuous alarm level MS. In the present embodiment, the maximum acceleration alarm level Lα is 250 Gal, the maximum value speed alarm level LV is 30 kine, the maximum value SI value alarm level LS is 30 kine, the acceleration continuous alarm level Mα is 200 Gal, the speed continuous alarm level MV is 25 kine, SI. The value duration warning level MS is set to 25 kine and the predetermined duration T is set to 120 sec.

  The control unit 30 has a function of level discriminating acceleration, speed, and SI value calculated based on electrical signals from the sensors S1, S2 of the internal seismic device 2A and the external seismic device 2B. Hereinafter, the acceleration, speed and SI value calculated based on the electrical signals from the sensors S1 and S2 of the internal seismic instrument 2A are referred to as “internal acceleration”, “internal speed” and “internal SI value”, respectively. These may be collectively referred to as “internally calculated values”. The acceleration, speed and SI value calculated based on the electrical signals from the sensors S1 and S2 of the external seismic instrument 2B are referred to as “external acceleration”, “external speed” and “external SI value”, respectively. Collectively, they may be referred to as “external calculation values”. In the present embodiment, the calculated acceleration, speed, and SI value may be collectively referred to as “calculated value”.

  Specifically, the control unit 30 discriminates the internal and external accelerations by the maximum acceleration alarm level Lα and the acceleration continuous alarm level Mα, and determines the internal and external speeds by the maximum speed alarm level and the speed continuous alarm level MV. It has a function of discriminating and discriminating the internal and external SI values by the maximum SI value alarm level LS and the SI value continuous alarm level MS.

  The control unit 30 has a function of determining whether or not at least one of the following three conditions is satisfied. In the present embodiment, (1) the internal acceleration and the external acceleration (hereinafter collectively referred to as “internal / external acceleration”) are equal to or higher than the acceleration continuous alarm level Mα, (2) the internal speed and The external speed (hereinafter collectively referred to as “internal / external speed” may be referred to as “internal / external speed”) is equal to or higher than the speed continuous alarm level MV, and (3) internal SI value and external SI value (hereinafter collectively referred to as these). In this case, it is determined whether or not at least one of the three conditions that the “internal / external SI value” is equal to or higher than the SI value continuous alarm level MS is satisfied.

  The control unit 30 has a function of measuring the duration when at least one of the conditions (1) to (3) is satisfied. The control unit 30 has a function of stopping the measurement of the duration when the condition is not satisfied. The control unit 30 has a function of determining whether the measured duration is equal to or longer than the predetermined duration T. Hereinafter, the condition (4) is that the measured duration is equal to or longer than the predetermined duration T.

  Hereinafter, a measurement method in which the control unit 30 measures the duration will be described. When the condition (1) or (2) is satisfied, the duration is measured by the same method. Therefore, the case where the condition (1) is satisfied will be described with reference to FIG. 6, and the measurement method when the condition (2) is satisfied will be referred to the measurement method in the case of the condition (1), and the description thereof will be omitted. To do. When the condition (1) is satisfied, the control unit 30 starts measuring the duration (this start time is set as time T0). The control unit 30 determines whether or not the condition (1) is satisfied at every predetermined time interval Δt from the time T0. The control unit 30 determines whether or not the condition (1) is satisfied at least once during each time interval Δt. If it is determined that the condition (1) is satisfied at least once during each time interval Δt, it is determined that the condition (1) is continuously satisfied during the time interval Δt. If the control unit 30 determines that the condition (1) is continuously satisfied during the time interval Δt, the control unit 30 adds the time interval Δt to the duration and continues the measurement of the duration. If the control unit 30 determines that the condition (1) is not satisfied, the control unit 30 stops the measurement of the duration time.

  Next, a case where the condition (3) is satisfied will be described. When the condition (3) is satisfied, the measurement of the duration is started (this start time is set as time T0). The control unit 30 continues the measurement of the duration while satisfying the condition (3). When the internal / external SI value becomes equal to or lower than the SI value continuous alarm level MS, the control unit 30 stops measuring the duration.

  The control unit 30 further has a function of determining whether or not at least one of the following three conditions is satisfied. In the present embodiment, (5) the internal / external acceleration is equal to or greater than the maximum acceleration alarm level Lα, (6) the internal / external speed is equal to or greater than the maximum speed alarm level LV, and (7) the internal / external SI value is a maximum SI value alarm. It is determined whether or not at least one of the three conditions of being level LS or higher is satisfied.

  The control unit 30 has a function of storing the internal / external acceleration in the storage unit 29. The control unit 30 has a function of storing internal and external accelerations in association with each other and storing waveforms of internal and external accelerations. The waveform of the internal / external acceleration is synonymous with the waveform indicating the change in internal / external acceleration with respect to the elapsed time. The storage unit 29 has a function of storing a plurality of internal and external acceleration waveforms, for example, 10 internal and external acceleration waveforms. When the storage unit 29 stores 10 waveforms and is requested to store another waveform, the storage unit 29 erases the waveform that has passed the most time since it has been stored. It has a function of storing waveforms. In the present embodiment, only the acceleration waveform is stored, but the velocity waveform and SI value waveform may be stored.

  The control unit 30 has a function of detecting the maximum values of internal calculation values and external calculation values (hereinafter, collectively referred to as “internal / external calculation values”) and storing them in the storage unit 29. A specific detection method will be described below. The control unit 30 includes a maximum value of internal / external calculation values stored in the storage unit 29 (hereinafter sometimes simply referred to as “maximum value”) and an internal / external calculation value (hereinafter, “ And may be referred to as “acquired operation value”). The calculation unit 34 that is a calculation unit corresponds to the acceleration calculation unit 26, the speed calculation unit 27, and the SI value calculation unit 28. When the acquired calculation value is larger than the maximum value stored in the storage unit 29, the control unit 30 overwrites and stores the acquired calculation value in the storage unit 29 as the maximum value. The control unit 30 has a function of controlling the display unit 9, the shutoff valve 3, and the alarm unit 4. When at least one of the conditions (4) to (7) is satisfied, the control unit 30 outputs an alarm signal to the shutoff valve 3 and the alarm unit 4.

  The display unit 9 serving as notification means includes an indicator 35 and a power lamp 36 shown in FIG. The display unit 9 is disposed on one surface portion of the housing 5 that is visible to the user. The indicator 35 acquires the maximum value of the internal / external acceleration and the internal / external SI value from the control unit 30, and displays these values by a bar graph. In FIG. 2, the internal seismic device is referred to as “internal sensor”, and the external seismic device is referred to as “external sensor”. In the present embodiment, the bar graph of the indicator 35 changes the color step by step based on the scale, and displays the maximum value of the acceleration and SI value. Indicator 35 is displayed by gradation of purple, blue, green, yellow, and red, for example. However, the indicator 35 is not limited to this, and the maximum value may be digitally displayed. Further, instead of the bar graph, a plurality of light emitting diodes (abbreviation: LED) may be arranged in a line, and the maximum value may be displayed according to the number of lighting LEDs. For example, when four LEDs are lit, it indicates that the maximum value of acceleration is 150 Gal or more and less than 200 Gal. The energizing lamp 36 is composed of, for example, an LED and has a function of indicating that electric power is supplied to the internal and external seismic devices 2A and 2B by emitting light.

  The shut-off valve 3 is a valve that is interposed in the pipe of the gas pipe and shuts off the gas flow. However, the shutoff valve 3 is not limited to the one that shuts off the gas flow. For example, what is necessary is just to intervene in the flow path of fluids, such as oil, and intercept the fluid. The shut-off valve 3 has a function of shutting off the gas pipe based on an alarm signal output from the control unit 30.

  The alarm unit 4 has a function of alarming the user. The alarm unit 4 includes a maximum value alarm lamp 37, a continuous alarm lamp 38, and an alarm device. The maximum value warning lamp 37 and the continuous warning lamp 38 are realized by light emitting diodes, for example. As shown in FIG. 2, the maximum value alarm lamp 37 and the continuous alarm lamp 38 are arranged on one surface portion of the housing 5 that can be visually recognized by the user. The control unit 30 has a function of causing the continuous warning lamp 38 to emit light when the condition (4) is satisfied. Further, the control unit 30 has a function of causing the maximum value alarm lamp 37 to emit light when the conditions (5) to (7) are satisfied. The alarm device has a function of acquiring an alarm signal output from the control unit 30 and alarming by sound.

  The earthquake evaluation apparatus 1 is configured to be electrically connectable to a commercial power source. The earthquake evaluation apparatus 1 is configured to acquire power from a commercial power source and supply power to each component. The earthquake evaluation apparatus 1 includes an internal power supply 39. The internal power supply 39 is a battery, for example, and is configured to be able to supply power for driving the earthquake evaluation apparatus 1 to each component. The internal power supply 39 is configured to be able to supply power to each component when power supply from the commercial power supply is interrupted.

  The operation unit 8 is configured to be operable by the user. The operation unit 8 includes a power switch, setting means, and a reset switch 40. The power switch is a switch for switching on and off the power supply from the commercial power supply and the internal power supply 39 to each component of the earthquake evaluation apparatus 1. The setting means is configured to be able to set the maximum value alarm level L, the continuous alarm level M, and the predetermined duration T stored in the control unit 30. In the present embodiment, the maximum acceleration alarm level Lα and the acceleration continuous alarm level Mα are configured to be set within a range of 110 Gal or more and 520 Gal or less. The maximum speed alarm level LV and the speed continuous alarm level MV are configured to be set within a range of 10 to 100 kine. The maximum SI value alarm level LS and the SI value continuous alarm level MS are configured to be set within a range of 10 kine or more and 100 kine. The predetermined duration T is configured to be set within a range of 10 seconds to 300 seconds.

  The reset switch 40 is disposed so as to be operable by the user. Specifically, the reset switch 40 is disposed on one surface portion of the housing 5. The reset switch 40 has a function of resetting the display of the indicator 35 to 0 Gal by operating this to reset the maximum value of the internal / external calculation values stored in the storage unit 29. The indicator 35 has a function of continuing to display the maximum values of the internal / external acceleration and the internal / external SI value until the reset switch 40 is operated. The reset switch 40 has a function of turning off the maximum value alarm lamp 37 and the continuous alarm lamp 38. The maximum value alarm lamp 37 and the continuous alarm lamp 38 have a function of emitting light and continuing the alarm until the reset switch 40 is operated.

  FIG. 7 is a flowchart showing the procedure of the earthquake evaluation method of the earthquake evaluation apparatus 1. FIG. 8 is a graph showing acceleration of vibration. FIG. 9 is a graph showing the speed of vibration. FIG. 10 is a graph showing the SI value of the vibration. Below, operation | movement of the control apparatus 7 of such an earthquake evaluation apparatus 1 is demonstrated. First, the operation of the control device 7 in the long-period ground motion having the waveform shown in FIGS. When the power switch of the earthquake evaluation apparatus 1 is turned on, the earthquake evaluation process is started and the process proceeds to step a1. In step a1, which is a preprocessing filter process, the display of the indicator 35 is returned to 0 Gal, and the maximum value stored in the storage unit 29 is deleted. When the display of the indicator 35 is returned to 0 Gal and the maximum value stored in the storage unit 29 is deleted, the process proceeds to step a2.

  Step a2, which is an earthquake detection determination step, determines whether the capacitances C1, C2 of the sensors S1, S2 of the internal and external seismic devices 2A, 2B are changing, that is, whether an earthquake is being detected. If no earthquake is detected, the process returns to step a1. If an earthquake is detected, the process proceeds from step a2 to step a3. The earthquake detection determination process corresponds to a detection process. In step a3, which is a calculation process, the internal / external acceleration, internal / external speed, and internal / external SI value are calculated based on the capacities C1, C2 of the sensors S1, S2 of the internal and external seismographs 2A, 2B. When the internal / external acceleration, internal / external speed, and internal / external SI value are calculated, the process proceeds from step a3 to step a4. In step a4 which is a waveform storing step, the waveform of the internal / external acceleration is stored in the storage unit 29. When stored, the process proceeds from step a4 to step a5.

  In step a5 which is a level determination step, the inside / outside operation value is discriminated by the maximum alarm level L and the continuous alarm level M, and any of the conditions (1) to (3) and (5) to (7) is set. Determine if it is satisfied. When at least one of the conditions (1) to (3) is satisfied, the process proceeds from step a5 to step a6. The level determination process corresponds to a discrimination process.

  Hereinafter, a case where at least one of the conditions (1) to (3) is satisfied will be specifically described with reference to FIGS. In the present embodiment, in order to simplify the description, it is assumed that the waveforms of the internal seismic device 2A and the external seismic device 2B are the same. First, a case where the condition (1) is satisfied will be described with reference to FIG. The internal / external acceleration is discriminated based on the acceleration continuous alarm level Mα. When the internal / external acceleration becomes equal to or higher than the acceleration duration warning level Mα at time T1, it is determined that the condition (1) is satisfied. Next, a case where the condition (2) is satisfied will be described with reference to FIG. The internal / external speed is discriminated by the speed continuous alarm level MV. When the internal / external speed becomes equal to or higher than the speed duration warning level MV at time T2, it is determined that the condition (2) is satisfied. Finally, a case where the condition (3) is satisfied will be described with reference to FIG. The internal / external SI value is discriminated by the SI value continuous alarm level MS. When the internal / external SI value becomes equal to or higher than the SI value continuous alarm level MS at time T3, it is determined that the condition (3) is satisfied. In this way, when it is determined that at least one of the conditions (1) to (3) is satisfied, the process proceeds from step a5 to step a6.

  In step a6, which is a time measurement start process, measurement of the duration time is started. When the measurement of the duration time is started, the process proceeds from step a6 to step a7. In step a7, which is a maximum value measurement process, the acquired calculation value is compared with the maximum value of the stored internal / external calculation value to detect the maximum value. When the maximum value is detected, the detected maximum value is overwritten and stored in the storage unit 29. When the maximum value is stored in the storage unit 29, the process proceeds from step a7 to step a8. In step a8, which is a maximum value notification step, the maximum value is displayed by the indicator 35. When the maximum value is displayed, the process proceeds from step a8 to step a9.

  In step a9 which is a duration determination step, it is determined whether or not the condition (4) is satisfied. When the condition (4) is satisfied, that is, when the duration is not less than the predetermined duration T, the process proceeds from step a9 to step a10. Below, the case where the condition (4) is satisfied will be specifically described with reference to FIGS. The predetermined duration T is set to time 4Δt, for example. The level discrimination determination step and the duration determination step correspond to the determination step.

  First, the case where the conditions (1) and (4) are satisfied will be described with reference to FIG. The measurement of the duration time is started, and it is determined whether or not the condition (1) is satisfied in the first section D1 exceeding the time T1 and not more than the time T1 + Δt. As shown in FIG. 8, in the first section D1, since the condition (1) is satisfied, it is determined that the duration of the condition (1) is the time Δt, and the measurement of the duration is further continued. Next, it is determined whether or not the condition (1) is satisfied in the second section D2 exceeding the time T1 + Δt and not exceeding the time T1 + 2Δt. As shown in FIG. 8, in the second section D2, since the condition (1) is satisfied, it is determined that the duration of the condition (1) is the time 2Δt, and the measurement of the duration is further continued. Similarly, it is sequentially determined whether the condition (1) is satisfied in the third section D3 exceeding the time T + 2Δt and below the time T1 + 3Δt and the fourth section D4 exceeding the time T1 + 3Δt and below the time T1 + 4Δt. In the third and fourth sections D4, as shown in FIG. 8, since the condition (1) is satisfied, it is determined that the duration of the condition (1) is the time 4Δt. Accordingly, it is determined that the condition (4) is satisfied, and the process proceeds from step a9 to step a10.

  Next, the case where the conditions (2) and (4) are satisfied will be described with reference to FIG. As in the case where the conditions (1) and (4) are satisfied, the first interval E1 that exceeds the time T2 and is less than or equal to the time T2 + Δt and the second that is more than the time T2 + Δt and that is less than the time T2 + 2Δt is measured. In the section E2, it is sequentially determined whether the condition (2) is satisfied in the third section E3 that exceeds the time T2 + 2Δt and is below the time T2 + 3Δt and the fourth section E4 that exceeds the time T + 3Δt and is below the time T + 4Δt. In the first section to the fourth section E1, E2, E3, E4, as shown in FIG. 9, since the condition (2) is satisfied, it is determined that the duration of the condition (2) is the time 4Δt. Accordingly, it is determined that the condition (4) is satisfied, and the process proceeds from step a9 to step a10.

  Finally, a case where the conditions (3) and (4) are satisfied will be described. When the measurement of the duration is started and the duration exceeds the predetermined duration 4Δt, it is determined that the condition (4) is satisfied, and the routine proceeds from step a9 to step a10.

  In step a10, which is a signal transmission process, an alarm signal is output to the shutoff valve 3 and the alarm unit 4. When the alarm signal is output, the process proceeds from step a10 to step a11. In step a11 which is an alarm cutoff process, the continuous alarm lamp 38 is caused to emit light. The alarm is activated based on the alarm signal and alerts the user by sound. The shut-off valve 3 operates based on the alarm signal and shuts off the gas flow. When the continuous alarm lamp 38 or the like is thus activated, the process proceeds from step a11 to step a12.

  In step a12 which is the maximum value measurement process, the maximum value is detected, and the detected maximum value is overwritten and stored in the storage unit 29 as in step a7. When the maximum value is stored in the storage unit 29, the process proceeds from step a12 to step a13. In step a13, which is the maximum value notification step, the maximum value is displayed by the indicator 35 as in step a8. When the maximum value is displayed, the process proceeds from step a13 to step a14. In step a14 which is a reset determination step, it is determined whether or not the reset switch 40 has been operated. When the reset switch 40 is operated, the process returns from step a14 to step a1. When the reset switch 40 is not operated, the process proceeds from step a14 to step a12.

  FIG. 11 is a graph showing acceleration of vibration. FIG. 12 is a graph showing the speed of vibration. FIG. 13 is a graph showing the SI value of the vibration. Next, operation | movement of the control apparatus 7 in the short period ground motion of the waveform shown to FIGS. Below, operation | movement of the control apparatus 7 is demonstrated, referring the flowchart of FIG. The operation of the control device 7 in short-period ground motion is different from the operation of the control device 7 in long-period ground motion in steps a5 and a11, and is the same as the operation of the control device 7 in long-period ground motion in other steps. Therefore, step a5 and step a11 will be described, and for the other steps, the operation of the control device 7 in the long-period ground motion will be referred to and description thereof will be omitted.

  In step a5 which is a level determination step, the inside / outside operation value is discriminated by the maximum alarm level L and the continuous alarm level M, and any of the conditions (1) to (3) and (5) to (7) is set. Determine if it is satisfied. When at least one of the conditions (5) to (7) is satisfied, the process proceeds from step a5 to step a10. In addition, when satisfying at least any one of the conditions (5) to (7), at least any one of the conditions (1) to (3) is also satisfied. In this case, the process goes from step a5 to step a10 without going from step a5 to step 6. However, it is not limited to only shifting from step a5 to step a10, it may shift to step a6 and step a10 and be processed in parallel.

  Hereinafter, a case where at least one of the conditions (5) to (7) is satisfied will be specifically described with reference to FIGS. 11 to 13. In the present embodiment, in order to simplify the description, it is assumed that the waveforms of the internal seismic device 2A and the external seismic device 2B are the same.

  First, a case where the condition (5) is satisfied will be described with reference to FIG. The internal / external acceleration is discriminated by the maximum acceleration alarm level Lα. When the internal / external acceleration becomes equal to or greater than the maximum acceleration warning level Lα at time T4, it is determined that the condition (5) is satisfied. Next, a case where the condition (6) is satisfied will be described with reference to FIG. The internal / external speed is discriminated by the maximum speed alarm level LV. When the internal / external speed becomes equal to or greater than the maximum speed alarm level LV at time T5, it is determined that the condition (6) is satisfied. Finally, a case where the condition (7) is satisfied will be described with reference to FIG. The internal / external SI value is discriminated by the maximum SI value alarm level LS. When the internal / external SI value becomes equal to or greater than the maximum SI value alarm level LS at time T6, it is determined that the condition (7) is satisfied. In this way, when it is determined that at least one of the conditions (5) to (7) is satisfied, the process proceeds from step a5 to step a10.

  In step a11 which is an alarm cutoff process, the maximum value alarm lamp 37 is caused to emit light. The alarm device operates based on the alarm signal and alerts the user. The shut-off valve 3 operates based on the alarm signal and shuts off the gas flow. When the maximum value alarm lamp 37 or the like is thus activated, the process proceeds from step a11 to step a12.

  Next, the operation of the control device 7 in an earthquake motion in which at least one of the inside / outside calculated values is less than the continuous warning level M will be described. The operation of the control device 7 in the ground motion in which at least one of the inside / outside calculated values does not reach the continuous warning level M is different from the operation of the control device 7 in the long-period ground motion in Step a5, and the control in the long-period ground motion in the other steps. The operation is similar to that of the device 7. Therefore, step a5 will be described, and the other steps will be described with reference to the operation of the control device 7 in long-period ground motion.

  In step a5 which is a level determination step, the inside / outside operation value is discriminated by the maximum alarm level L and the continuous alarm level M, and any of the conditions (1) to (3) and (5) to (7) is set. Determine if it is satisfied. If all the conditions (1) to (3) and (5) to (7) are not satisfied, the process returns from step a5 to step a1.

  Specifically, the internal / external calculation value is discriminated based on the continuous alarm level M. When the internal / external acceleration is equal to or less than the acceleration continuous alarm level Mα, the internal / external speed is equal to or less than the speed continuous alarm level MV, and the internal / external SI value is equal to or less than the SI value continuous alarm level MS, the conditions (1) to (3) and (5 ) To (7), it is determined that none of the conditions is satisfied. If all of the conditions (1) to (3) and (5) to (7) are not satisfied, the process proceeds from step a5 to step a1.

  Finally, the operation of the control device 7 when the duration is less than the predetermined duration T in the long-period ground motion will be described. In step 9, it is determined that the condition (4) is not satisfied, that is, the duration is less than the predetermined duration T, and the process returns from step a9 to step a1.

  Below, the effect which the earthquake evaluation apparatus 1 comprised in this way has is demonstrated. According to the earthquake evaluation method of the present embodiment, the inside / outside calculation value is calculated based on the detected vibration. It is determined whether or not the inside / outside calculated value is equal to or higher than the continuous warning level M for a predetermined duration T or longer. Therefore, it is possible to detect a vibration that is not detectable by the conventional earthquake evaluation method and whose internal / external calculation value is smaller than the maximum alarm level L and continues for a long time. As a result, when a tremor that is smaller than the maximum alarm level L and that continues for a long time occurs, this tremor can be detected and the shutoff valve 3 and the alarm unit 4 can be operated. Therefore, in the case of a tremor that is less than the maximum value alarm level L and that continues for a long time, this can be detected reliably and the flow of gas etc. can be shut off at an early stage. Secondary damage can be reduced compared to the method.

  According to the earthquake evaluation method of the present embodiment, it is further determined whether or not the inside / outside calculated value is greater than or equal to the maximum alarm level L. Since discrimination can be made at two levels, the internal / external calculation value is smaller than the maximum value alarm level L and cannot be detected by the conventional earthquake evaluation apparatus 1, and the internal / external calculation value is greater than the maximum value alarm level L. Vibration can be detected. As a result, whether or not there is a vibration that has a calculated value that is smaller than the maximum alarm level L and continues for a long time, or a vibration that has a calculated value that is greater than the maximum alarm level L, these vibrations. Can be detected, and the shutoff valve 3 and the alarm unit 4 can be operated.

  According to the earthquake evaluation apparatus 1 of the present embodiment, the calculation unit 34 calculates the internal / external calculation value based on the vibration detected by the seismic device 2. The control unit 30 discriminates the internal / external calculation values calculated by the calculation unit 34 at the corresponding continuous alarm level M. The control unit 30 determines whether or not the internal / external calculation value is equal to or higher than the continuous warning level M for a predetermined duration T or longer. Therefore, it is possible to detect a vibration that cannot be detected by the conventional earthquake evaluation apparatus 1 and whose internal / external calculation value is smaller than the maximum alarm level L and continues for a long time. As a result, when a tremor that is smaller than the maximum alarm level L and that continues for a long time occurs, this tremor can be detected and the shutoff valve 3 and the alarm unit 4 can be operated. Therefore, in the case of a vibration that has an internal / external calculation value smaller than the maximum alarm level L and continues for a long time, this can be reliably detected, and the flow of gas or the like can be shut off at an early stage. Secondary damage can be reduced as compared with the earthquake evaluation device 1.

  According to the seismic evaluation apparatus 1 of the present embodiment, the control unit 30 further discriminates the inside / outside calculated value by the maximum value alarm level L corresponding thereto. The controller 30 further determines whether or not the calculated value is greater than or equal to the maximum alarm level L. Since discrimination can be made at two levels, the internal / external calculation value is smaller than the maximum value alarm level L and cannot be detected by the conventional earthquake evaluation apparatus 1, and the internal / external calculation value is greater than the maximum value alarm level L. Vibration can be detected. As a result, whether or not there is a vibration that has a calculated value that is smaller than the maximum alarm level L and continues for a long time, or a vibration that has a calculated value that is greater than the maximum alarm level L, these vibrations. Can be detected, and the shutoff valve 3 and the alarm unit 4 can be operated.

  According to the earthquake evaluation apparatus 1 of the present embodiment, the indicator 35 of the display unit 9 notifies the internal / external acceleration and the internal / external SI value. Thus, the user can know the internal / external acceleration and the internal / external SI value, and can evaluate the earthquake by visual recognition.

According to the earthquake evaluation device 1 of the present embodiment, when the inside / outside calculated value continues at the continuous alarm level M or more and continues for the predetermined duration T or more, the alarm signal is output and the cutoff valve 3 is operated. As a result, when the ground motion continues for a predetermined duration T or longer, for example, when the long-period ground motion continues for a long time, it is possible to prevent the gas pipe from being damaged. As a result, it is possible to suppress the occurrence of enormous damage by igniting the leaked gas.

  According to the earthquake evaluation device 1 of the present embodiment, when measuring the durations of the conditions (1) and (2), it is determined whether or not the condition is satisfied at least once for each time interval Δt. As a result, it is possible to realize the measurement of the duration even if the waveform vibrates like acceleration and speed. Thereby, it is possible to detect a vibration that has a small internal / external calculation value and continues for a long time, and the shut-off valve 3 and the alarm unit 4 can be operated based on the detection of the vibration. This can suppress the occurrence of enormous damage.

  According to the earthquake evaluation device 1 of the present embodiment, when measuring the duration of the condition (3), the control unit 30 starts measuring the duration when the condition (3) is satisfied. The control unit 30 continues the measurement of the duration while satisfying the condition (3). Therefore, the measurement of the duration is easy, and the processing load on the control device 7 can be reduced.

  According to the earthquake evaluation apparatus 1 of the present embodiment, the indicator 35 displays the maximum value. As a result, the user can easily visually recognize the internal / external acceleration and the maximum value of the internal / external SI value after the occurrence of the earthquake. Therefore, after the occurrence of the earthquake, in order to read the maximum values of the internal / external acceleration and the internal / external SI value, it is not necessary to take out information from the storage unit 29 of the earthquake evaluation device 1 and analyze it, which is highly convenient. The bar graph of the indicator 35 changes in color step by step based on the scale. As a result, the user can visually recognize the maximum values of the internal / external acceleration and the internal / external SI value more easily.

  According to the earthquake evaluation apparatus 1 of the present embodiment, the maximum value alarm lamp 37 emits light when the conditions (5) to (7) are satisfied, and the continuous alarm lamp 38 emits light when the condition (4) is satisfied. , Alarm. Therefore, the user can determine whether the condition (4) is satisfied and the alarm is issued, or whether the conditions (5) to (7) are satisfied and the alarm is issued. As a result, the cause of the operation of the shutoff valve 3 and the alarm unit 4 can be easily determined.

  According to the earthquake evaluation apparatus 1 of the present embodiment, the maximum value alarm level L and the continuous alarm level M can be set by the setting means. As a result, the maximum alarm level L and the continuous alarm level M can be set according to the characteristics of the building where the earthquake evaluation apparatus 1 is disposed, the location, the state of the gas pipes disposed in the building, and the like. In this way, since the setting of the maximum alarm level L and the continuous alarm level M can be changed according to the individual arrangement state, the magnitude of the earthquake can be more accurately evaluated. Therefore, the occurrence of enormous damage can be suppressed.

  According to the earthquake evaluation apparatus 1 of the present embodiment, the internal power supply 39 is provided. Since the earthquake evaluation apparatus 1 is provided with an internal power supply, it can be driven even when power supply from a commercial power supply is stopped due to an earthquake and a power failure. Therefore, even in the case of an earthquake that occurs after the supply of power from the commercial power supply is stopped, the shut-off valve 3 can be operated and the maximum value of the calculated value can be measured based on the evaluation of the earthquake.

FIG. 14 is a graph showing the SI value of the vibration divided for each time. In FIG. 14, the vertical axis represents the SI value, and the horizontal axis represents time. In the present embodiment, the measurement of the duration is realized by continuing the measurement of the duration while the condition (3) is satisfied. However, the present invention is not necessarily limited to this. For example, as in the case of internal / external acceleration and internal / external speed, it may be realized by determining whether or not the condition (3) is satisfied at least once for each time interval Δt. Specifically, with reference to FIG. 14, the condition (3) is satisfied in the first section F1 in the first section F1 that exceeds the time T7 and is equal to or less than the time T7 + Δt. It is determined that it is satisfied. Here, time T7 is a predetermined time. Thereby, it is determined that the duration of the condition (3) is the time Δt, and the measurement of the duration is continued. Similarly, the condition (3) is satisfied in the second section F2 exceeding the time T7 + Δt and not exceeding the time T7 + 2Δt, the third section F3 exceeding the time T7 + 2Δt and not exceeding the time T7 + 3Δt, and the fourth section F4 exceeding the time T7 + 3Δt and not exceeding the time T7 + 4Δt. Since it is satisfied, it is determined that the condition (3) is satisfied between the second section to the fourth section F2, F3, F4. It is determined that the duration of condition (3) is time 4Δt, and the measurement of the duration is continued. It is determined that the condition (3) is not satisfied in the fifth section F5 exceeding the time T7 + 4Δt and not exceeding the time T7 + 5Δt. As a result, the control unit 30 stops measuring the duration and determines that the duration is time 4Δt. In this way, the duration of the condition (3) may be measured.

  In this embodiment, when the condition is satisfied in a continuous section, the measurement of the duration is continued, and when the condition is not satisfied in at least one section, the measurement of the duration is stopped, but such a measurement method It is not limited to. For example, the predetermined duration T is divided into a plurality of sections at a time interval Δt. When a condition is satisfied in a predetermined ratio or more of the plurality of sections, the duration for which the condition is satisfied may be determined to be equal to or longer than the predetermined duration T. Thereby, even if a part of a plurality of sections accidentally does not satisfy the conditions (1) to (3), the magnitude of the earthquake can be evaluated. Therefore, accidental phenomena can be taken into consideration, the scale of the earthquake can be evaluated more accurately, and the occurrence of severe damage can be suppressed.

  In the present embodiment, although the calculation unit 34 includes the acceleration calculation unit 26, the speed calculation unit 27, and the SI value calculation unit 28, the calculation unit 34 is not limited to including all of them. It suffices that the calculation unit 34 includes at least one of the acceleration calculation unit 26, the speed calculation unit 27, and the SI value calculation unit 28, and can calculate at least one of acceleration, speed, and SI value. As a result, it is possible to detect an earthquake that has a small vibration and continues for a long time while reducing the burden caused by the calculation processing of the calculation unit 34.

  In the present embodiment, all the calculated values are calculated and the earthquake is evaluated based on these calculated values, but the present invention is not necessarily limited to such a configuration. It is also possible to select and calculate at least one of the calculated values. Specifically, the following functions are added to the setting means of the operation unit 8 and the control unit 30. The setting means is electrically connected to the control unit 30 and further has a function of setting which of acceleration, speed, and SI value is calculated based on a user operation. A value set among the speed, the speed, and the SI value may be referred to as a set operation value. The control unit 30 causes the setting calculation value set by the setting means to be calculated. As a result, calculation values other than the set calculation value are not calculated, and the calculation processing load of the control device 7 can be reduced.

  Moreover, in this Embodiment, although the two seismic devices 2 of the internal and external seismic devices 2A and 2B are included, it is not necessarily limited to including the two seismic devices 2. There may be one seismic device 2 or three or more. Further, the seismic device 2 is not limited to a horizontal two-axis one, and may be one that can detect a three-axis vibration including a Z direction that is a direction perpendicular to the X direction and the Y direction. Sensors S1 and S2 are not limited to capacitive sensors, and may be any sensors that can detect vibration and calculate acceleration. For example, a device that calculates acceleration using a piezoelectric element or a device that detects the acceleration of an object displaced by vibration using ultrasonic waves may be used.

  FIG. 15 is a block diagram illustrating an electrical configuration of the earthquake evaluation apparatus 1A according to the second embodiment. FIG. 16 is a front view showing the earthquake evaluation apparatus 1A. The earthquake evaluation apparatus 1A of the second embodiment is similar in configuration to the earthquake evaluation apparatus 1 of the first embodiment. Therefore, only the configuration different from the earthquake evaluation device of the first embodiment will be described for the earthquake evaluation device 1A of the second embodiment, and the same components will be denoted by the same reference numerals and the description thereof will be omitted. The earthquake evaluation apparatus 1 </ b> A includes a housing 5, two seismic devices 2, a signal line 6, a control device 7 </ b> A, an operation unit 8, a display unit 9 </ b> A, a shut-off valve 3, and an alarm unit 4.

  The control device 7A includes a high-pass filter 25, a low-pass filter 32, an A / D converter 31, two filters 33A, an acceleration calculation unit 26, an SSI value calculation unit 50, a storage unit 29, and a control unit 30A. The two filters 33A are a first filter 33a and a fourth filter 33d. The fourth filter 33d is electrically connected to the A / D converter 31 and the SSI value calculation unit 50.

  The SSI value calculation unit 50 is electrically connected to the control unit 30. The SSI value calculation unit 50 has a function of calculating SSI values based on electrical signals transmitted from the sensors S1 and S2 of the seismic devices 2A and 2B through the high-pass filter 25 and the like. The SSI value is a spectrum intensity SSI of the speed response spectrum Sv having a period β and a period γ, and is calculated by the equation (3) using the speed response spectrum Sv and the period τ.

The SSI value is a value obtained by integrating the speed response spectrum Sv with respect to the period τ in the range of the period β to the period γ, and dividing the integrated value by γ−β. In the present embodiment, the period β is 0.1 sec and the period γ is 10.0 sec. However, the periods β and γ are not limited to the above values, and it is sufficient that the period β satisfies 0 <β <γ and the period γ satisfies 2.5 <γ.

  A specific calculation method will be described. The SSI value calculation unit 50 calculates the acceleration based on the capacitances C <b> 1 and C <b> 2 between the pendulum 21 and the electrodes 17 and 18, similarly to the acceleration calculation unit 26. Based on this acceleration, the SSI value calculator 50 detects the speed response in increments of Δτsec from the period β to the period γ. In the present embodiment, 100 speed responses from a period of 0.1 sec to 10.0 sec are calculated at intervals of 0.1 sec. The SI value calculation unit 28 detects the maximum value of the speed response in each cycle from the detection start to the current time. As a maximum value detection method, for example, a speed response calculated in a recording medium such as a RAM included in the control unit 30A is stored. The stored speed response is compared with the speed response calculated in order, the larger value is stored, and the smaller value is erased. This detects the maximum value of the speed response. The SI value calculation unit 28 calculates the SSI value by dividing the sum of the maximum values of the detected speed responses of each period by γ-β, that is, 9.9. In the present embodiment, the capacitors C1 and C2 are parallel capacitors of the sensors S1 and S2. Accordingly, the SSI value corresponds to the SSI value of the speed response spectrum Sv obtained by vector synthesis of the speed response spectrum Sv of the X direction component and the Y direction component. The fourth filter 33 d has a function of removing noise included in the signal transmitted from the A / D converter 31 to the SSI value calculation unit 50. In the present embodiment, the acceleration calculation unit 26 and the SSI value calculation unit 50 may be referred to as a calculation unit 34A.

  The control unit 30A is electrically connected to the storage unit 29, the display unit 9, the shutoff valve 3, the alarm unit 4, and the operation unit 8. The control unit 30A stores a maximum acceleration alarm level Lα and a maximum value SSI value alarm level LI. In the present embodiment, the maximum acceleration alarm level Lα is set to 200 Gal, and the maximum value SSI value alarm level LI is set to 30 kine. However, it is not limited to these values. In the present embodiment, the maximum acceleration warning level Lα and the maximum value SSI value warning level LI may be collectively referred to as a maximum value warning level L.

  The control unit 30A has a function of level-discriminating acceleration and SSI values calculated based on electrical signals from the sensors S1, S2 of the internal seismic device 2A and the external seismic device 2B. In the present embodiment, hereinafter, the SSI value calculated based on the electrical signals from the sensors S1, S2 of the internal seismic device 2A is referred to as “internal SSI value”, and the sensors S1, S2 of the external seismic device 2B. The SSI value calculated on the basis of the electrical signal from is sometimes referred to as an “external SSI value”. Specifically, the control unit 30A has a function of discriminating internal and external accelerations at the maximum acceleration alarm level Lα and discriminating internal and external SSI values at the maximum SSI value alarm level LI.

  The control unit 30A has a function of determining whether or not at least one of the following two conditions is satisfied. In the present embodiment, (8) the internal / external acceleration is greater than or equal to the maximum acceleration alarm level Lα, and (9) the internal and external SSI values (hereinafter sometimes referred to as “internal / external SSI values”) are the maximum SSI values. It is determined whether at least one of the two conditions that the alarm level is LI or higher is satisfied.

  Similar to the control unit 30A of the first embodiment, the control unit 30A has a function of storing the waveform of the internal / external acceleration in the storage unit 29, a function of detecting and storing the maximum values of the internal / external acceleration and the internal / external SSI value, and a display unit. 9. It has a function of controlling the shut-off valve 3 and the alarm unit 4. When the condition (8) or (9) is satisfied, the control unit 30A outputs an alarm signal to the shutoff valve 3 and the alarm unit 4. When the condition (8) or (9) is satisfied, the control unit 30A has a function of causing the maximum value alarm lamp 37 corresponding to the condition to emit light. The alarm device has a function of acquiring an alarm signal output from the control unit 30A and alarming by sound.

  The display unit 9A includes an indicator 35A and a power lamp 36 shown in FIG. The display portion 9A is disposed on one surface portion of the housing 5 that can be visually recognized by the user. The indicator 35A acquires the maximum values of the internal / external acceleration and the internal / external SSI value from the control unit 30A, and displays them as bar graphs as in the case of the indicator 35A of the first embodiment.

  The setting means of the operation unit 8 is configured to be able to set the maximum acceleration alarm level Lα and the maximum value SSI value alarm level LI stored in the control unit 30A. In the present embodiment, the maximum acceleration alarm level Lα is configured to be set within a range of 110 Gal or more and 520 Gal or less. The maximum value SSI value alarm level LI is configured to be set within a range of 10 kine or more and 100 kine.

  FIG. 17 is a flowchart showing the procedure of the earthquake evaluation method of the earthquake evaluation apparatus 1A. FIG. 18 is a graph showing acceleration of vibration. FIG. 19 is a graph showing the SSI value of vibration. Below, operation | movement of 7 A of control apparatuses of the earthquake evaluation apparatus 1A in the long-period ground vibration of the waveform shown to FIG. 18 and FIG. 19 is demonstrated. When the power switch of the earthquake evaluation apparatus 1 is turned on, the earthquake evaluation process is started and the process proceeds to step b1. In step b1, which is a preprocessing filter process, the display of the indicator 35A is returned to 0 Gal, and the maximum value stored in the storage unit 29 is deleted. When the display of the indicator 35A is returned to 0 Gal and the maximum value stored in the storage unit 29 is deleted, the process proceeds from step b1 to step b2.

  Step b2, which is an earthquake detection determination step, determines whether the capacitances C1, C2 of the sensors S1, S2 of the internal and external seismographs 2A, 2B are changing, that is, whether an earthquake is detected. If no earthquake is detected, the process returns to step b1. If an earthquake is detected, the process proceeds from step b2 to step b3. In step b3 which is a calculation process, the internal / external acceleration and the internal / external SSI value are calculated based on the capacitances C1 and C2 of the sensors S1 and S2 of the internal and external seismographs 2A and 2B. When the internal / external acceleration and the internal / external SSI value are calculated, the process proceeds from step b3 to step b4. In step b4 which is a waveform storing step, the waveform of the internal / external acceleration is stored in the storage unit 29. When stored, the process proceeds from step b4 to step b5.

  In step b5 which is a level determination step, the internal / external acceleration and the internal / external SSI value are level-discriminated by the maximum acceleration alarm level L and the maximum value SSI value alarm level LI, respectively, and at least one of the conditions (8) and (9) Determine whether the condition is met. When at least one of the conditions (8) and (9) is satisfied, the process proceeds from step b5 to step b6.

  Hereinafter, a case where at least one of the conditions (8) and (9) is satisfied will be described in detail with reference to FIGS. In the present embodiment, in order to simplify the description, it is assumed that the waveforms of the internal seismic device 2A and the external seismic device 2B are the same.

  First, a case where the condition (8) is satisfied will be described with reference to FIG. The internal / external acceleration is discriminated by the maximum acceleration alarm level Lα. When the internal / external acceleration becomes equal to or greater than the maximum acceleration warning level Lα at time T8, it is determined that the condition (8) is satisfied. Next, a case where the condition (9) is satisfied will be described with reference to FIG. The inside / outside SSI value is discriminated by the maximum value SSI value alarm level LI. When the internal / external SSI value becomes equal to or greater than the maximum value SSI value alarm level LI at time T9, it is determined that the condition (9) is satisfied. In this way, when it is determined that at least one of the conditions (8) and (9) is satisfied, the process proceeds from step b5 to step b6.

  In step b6, which is a signal transmission process, an alarm signal is output to the shutoff valve 3 and the alarm unit 4. When the alarm signal is output, the process proceeds from step b6 to step b7. In step b7, which is an alarm cutoff process, the maximum value alarm lamp 37 is caused to emit light. The alarm device operates based on the alarm signal and alerts the user. The shut-off valve 3 operates based on the alarm signal and shuts off the gas flow. When the maximum value alarm lamp 37 or the like is thus activated, the process proceeds to step b8.

  In step b8, which is the maximum value measurement step, the acquired calculation value is compared with the maximum value of the stored internal / external calculation value to detect the maximum value. When the maximum value is detected, the detected maximum value is overwritten and stored in the storage unit 29. When the maximum value is stored in the storage unit 29, the process proceeds from step b8 to step b9. In step b9 which is the maximum value notification step, the maximum value is displayed by the indicator 35A. When the maximum value is displayed, the process proceeds from step b9 to step b10. In step b10 which is a reset determination step, it is determined whether or not the reset switch 40 has been operated. When the reset switch 40 is operated, the process returns from step b10 to step b1. When the reset switch 40 is not operated, the process proceeds from step b10 to step b8.

  Next, the operation of the control device 7 in an earthquake motion in which at least one of the internal and external accelerations does not satisfy the maximum acceleration warning level Lα and at least one of the internal and external SSI values does not satisfy the maximum value SSI value alarm level LI. explain. The operation of the control device 7 in such a ground motion is different from the operation of the control device 7 in the ground motion having the waveform shown in FIGS. 18 and 19 in step b5, and is the same as the operation of the control device 7 in the ground motion in other steps. . Therefore, step b5 will be described, and the other steps will be described with reference to the operation of the control device 7 in the ground motion of the waveform shown in FIGS.

  In step b5 which is a level determination step, the internal / external acceleration and the internal / external SSI value are level-discriminated by the maximum acceleration alarm level L and the maximum value SSI value alarm level LI, respectively, and at least one of the conditions (8) and (9) Determine whether the condition is met. If all the conditions (8) and (9) are not satisfied, the process returns from step b5 to step b1.

  Specifically, when the internal / external acceleration is equal to or less than the maximum acceleration alarm level Lα and the internal / external SSI value is equal to or less than the maximum value SSI value alarm level LI, it is determined that the conditions (8) and (9) are not satisfied. If the conditions (8) and (9) are not satisfied, the process proceeds from step b5 to step b1.

  Below, the effect which 1 A of earthquake evaluation apparatuses comprised in this way show | plays is demonstrated. According to the earthquake evaluation apparatus 1A of the present embodiment, in the calculation step, the speed response spectrum Sv of the period β to the period γ is calculated based on the vibration detected in the detection process, and based on the speed response spectrum Sv. The inside / outside SSI value is calculated. In the level determination step, the internal / external SSI value is discriminated by the maximum value SSI value alarm level LI. The period γ is a value exceeding 2.5 seconds. Therefore, it is possible to detect long-period ground motion that cannot be detected by conventional earthquake evaluation methods. Thus, in the case of long-period ground motion, this ground motion can be detected and the shut-off valve 3 and the alarm unit 4 can be operated. Therefore, in the case of long-period ground motion, this can be reliably detected and the flow of gas or the like can be interrupted at an early stage, so that secondary damage can be reduced compared to conventional earthquake evaluation methods.

  Further, according to the earthquake evaluation apparatus 1A of the present embodiment, in the level discrimination step, the internal / external acceleration calculated in the calculation step is further discriminated based on the maximum acceleration alarm level Lα. In the level discrimination process, at least one of the two conditions that the inside / outside SSI value is equal to or greater than the maximum value SSI value alarm level LI and (2) the inside / outside acceleration is equal to or greater than the maximum acceleration alarm level Lα is set. It is determined whether or not it is satisfied. Therefore, it is possible to detect a vibration in which the inside / outside SSI value is smaller than the maximum value SSI value alarm level and the inside / outside acceleration is greater than the maximum acceleration alarm level Lα. In the seismic evaluation method of the present embodiment, it is possible to reliably detect vibrations that cause enormous damage from the viewpoints of both internal and external accelerations and internal and external SSI values, and to operate the shut-off valve 3 and the alarm unit 4 and the like. As a result, the flow of gas and the like can be shut off early, so that secondary damage can be reduced as compared with the conventional earthquake evaluation method.

  Moreover, according to the earthquake evaluation apparatus 1A of the present embodiment, the SSI value calculation unit 50 calculates the speed response spectrum Sv having the period β to the period γ based on the vibration detected by the seismic sensor 2, and this Based on the speed response spectrum Sv, an inside / outside SSI value is calculated. The control unit 30A discriminates the inside / outside SSI value by the maximum value SSI value alarm level LI. The period γ is a value exceeding 2.5 seconds. Therefore, it is possible to detect long-period ground motion that cannot be detected by a conventional earthquake evaluation apparatus. Thereby, in the case of long-period ground motion, this ground motion can be detected and the shut-off valve 3 and the alarm unit 4 can be operated. Therefore, in the case of long-period ground motion, this can be reliably detected and the flow of gas and the like can be shut off early, so that secondary damage can be reduced compared to conventional earthquake evaluation equipment. .

  Further, according to the earthquake evaluation apparatus 1A of the present embodiment, the control unit 30A further discriminates the internal / external acceleration calculated by the acceleration calculation unit 26 at the maximum acceleration discrimination level Lα. The control unit 30A sets at least one of the two conditions that the inside / outside SSI value is equal to or greater than the maximum value SSI value alarm level LI and (2) that the inside / outside acceleration is equal to or greater than the maximum acceleration alarm level Lα. It is determined whether or not it is satisfied. Therefore, it is possible to detect a vibration in which the inside / outside SSI value is smaller than the maximum value SSI value alarm level LI and the inside / outside acceleration is greater than the maximum acceleration alarm level Lα. The seismic evaluation device can reliably detect tremors that cause enormous damage from the viewpoints of both internal and external accelerations and internal and external SSI values, and can operate shut-off valves and alarms. As a result, the flow of gas and the like can be shut off early, so that secondary damage can be reduced as compared with the conventional earthquake evaluation method.

  Moreover, according to the earthquake evaluation apparatus 1A of the present embodiment, the display unit 9 notifies the inside / outside SSI value. As a result, the user can know the inside / outside SSI value and can evaluate the earthquake by visual recognition.

  Further, according to the earthquake evaluation apparatus 1A of the present embodiment, the seismic motion is evaluated by calculating the internal and external SSI values based on the speed response spectrum Sv in the range of the period of 0.1 sec or more and 10.0 sec or less. Therefore, the velocity response spectrum Sv in the range larger than the period 2.5 sec can be set as the evaluation object, and the long-period ground motion can be detected more accurately than the conventional earthquake evaluation apparatus. The Tonankai and Nankai earthquakes are predicted to be long-period ground motion. Due to such long-period ground motion, a skyscraper, which is a building with a height of 60 m or more and whose natural period is designed to be greater than 2.5 seconds, resonates. Therefore, according to the earthquake evaluation apparatus 1A of the present embodiment that can evaluate long-period ground motion, when long-period ground motion occurs, the shut-off valve 3 and the alarm unit 4 are operated, and gas or the like is generated from the conventional earthquake evaluation apparatus. Can be shut off early. Therefore, secondary damage can be reduced as compared with the conventional earthquake evaluation apparatus.

  Further, according to the earthquake evaluation apparatus 1A of the present embodiment, although the period γ is a value larger than 2.5 seconds, the period γ is preferably 10.0 seconds or more. In the speed response spectrum Sv, a long period ground motion with a period of 10.0 sec or more is unlikely to occur, and if it is within the above range, it is possible to accurately detect a long period ground motion.

  According to the earthquake evaluation apparatus 1A of the present embodiment, the indicator 35A displays the maximum value. As a result, the user can easily visually recognize the internal / external acceleration and the maximum value of the internal / external SSI value after the occurrence of the earthquake. Therefore, in order to read the maximum values of the internal / external acceleration and the internal / external SSI value after the occurrence of the earthquake, it is not necessary to take out and analyze the information from the storage unit 29 of the earthquake evaluation apparatus 1, which is highly convenient. Further, the color of the bar graph of the indicator 35A changes stepwise based on the scale. Thus, the user can more easily visually recognize the maximum values of the internal / external acceleration and the internal / external SSI value.

  According to the earthquake evaluation apparatus 1A of the present embodiment, the maximum acceleration alarm level Lα and the maximum value SSI value alarm level LI can be set by the setting means. Accordingly, the maximum acceleration alarm level Lα and the maximum value SSI value alarm level LI can be set according to the characteristics of the building where the earthquake evaluation apparatus 1 is disposed, the location, the state of the gas pipe disposed in the building, and the like. In this way, since the setting of the maximum alarm level L and the continuous alarm level M can be changed according to the individual arrangement state, the magnitude of the earthquake can be more accurately evaluated. Therefore, the occurrence of enormous damage can be suppressed.

  According to the earthquake evaluation apparatus 1A of the present embodiment, the internal power supply 39 is provided. Since the earthquake power evaluation apparatus 1A is provided with the internal power supply 39, the earthquake evaluation apparatus 1A can be driven even when the power supply from the commercial power supply is stopped due to an earthquake and a power failure. Therefore, even if an earthquake occurs after the supply of power from the commercial power supply is stopped, the shutoff valve 3 and the alarm unit 4 can be operated and the maximum value of the calculated value can be measured based on the evaluation of the earthquake.

  In the present embodiment, the period β is set to 0.1 sec and the period γ is set to 10.0 sec, but the present invention is not necessarily limited to this value. For example, the period β and the period γ may be set by the setting unit of the operation unit 8. Thereby, the range of the period of the speed response spectrum Sv included in the evaluation target can be set according to the characteristics of the building where the earthquake evaluation apparatus 1 is disposed, the location, the state of the gas pipe disposed in the building, and the like. For example, when the natural period of the building is a period of 5.0 seconds, it is only necessary to evaluate the speed response spectrum Sv in the range up to the vicinity of the period of 5.0 seconds. Therefore, since the settings of the period β and the period γ can be changed according to the state of each building, the scale of the earthquake can be accurately evaluated according to the state of each building and the processing load of the SSI value calculation unit 50 can be reduced. Can be reduced.

  Further, the number of speed responses calculated by the SSI value calculation unit 50 may be set, that is, Δτsec may be set. Accordingly, when Δτsec is set in accordance with the calculation capability of the SSI value calculation unit 50, the number of speed responses to be calculated can be adjusted. Thereby, the processing load of the SSI value calculation unit 50 can be adjusted. Therefore, the shut-off valve 3 and the alarm unit 4 can be operated by instantaneously evaluating the vibration based on the vibration detected by the seismic sensor 2, and the vibration can be quickly dealt with.

  Further, according to the earthquake evaluation apparatus 1A of the present embodiment, since the magnitude of the earthquake is evaluated from the viewpoint of both acceleration and SSI value, it is possible to detect both short period and long period ground motions. Therefore, the magnitude of the earthquake can be more accurately evaluated according to the damage of the earthquake.

  In the first embodiment, the calculation value includes acceleration, speed, and SI value, but may include an SSI value instead of the SI value. Specifically, an SSI value calculation unit 50 is provided in place of the SI value calculation unit 28. The control unit 30A stores the maximum value SSI value alarm level LI that is the maximum value alarm level L corresponding to the internal / external SSI value and the SSI value continuous alarm level MI that is the continuous alarm level M corresponding to the internal / external SSI value. The maximum value SSI value alarm level LI is set to, for example, 30 kine, and the SSI value continuous alarm level MI is set to 25 kine. The maximum value SSI value alarm level LI and the SSI value continuous alarm level MI are configured to be variable by setting means. When the inside / outside SSI value is equal to or greater than the maximum value SSI value alarm level LI, the control unit 30A performs the same operation as when the conditions (5) to (7) are satisfied. When the inside / outside SSI value is equal to or higher than the SSI value continuous alarm level MI, the control unit 30A performs the same operation as when the conditions (1) to (3) are satisfied. By evaluating the ground motion based on the inside / outside SSI value, it is possible to more accurately detect the long-period ground motion, which is excluded from the evaluation target in the conventional SI value. As a result, the conventional earthquake evaluation apparatus can suppress the occurrence of enormous damage even when long-period ground motions that are excluded from the evaluation target occur.

  If long-period vibration continues for a long time, for example, if the internal / external SSI value is higher than the SSI value continuous alarm level MI for a long time, the building based on the ground motion may fluctuate greatly, and the piping provided inside the building may break. There is sex. By including the internal / external SSI value in the evaluation target in the first embodiment, it is possible to evaluate whether or not such long-period ground motion continues for a long time. Further, by operating the shut-off valve 3 and the alarm unit 4 based on this evaluation, it is possible to suppress the occurrence of enormous damage even when long-period ground motion occurs.

  The calculated value includes the SSI value. The SSI value is the spectrum intensity of the speed response spectrum Sv that is equal to or greater than the predetermined period β and equal to or less than the predetermined period γ. Since the period γ is greater than 2.5 seconds, it is possible to detect long-period ground motions that are excluded from the evaluation target with the conventional SI value. Accordingly, when long-period ground motion continues for a long time, the shut-off valve and the alarm device can be operated based on the detection, and damage to gas pipes and the like disposed in the skyscraper can be prevented. As a result, the secondary damage can be reduced as compared with the conventional earthquake evaluation apparatus.

  Although the second embodiment includes two seismic devices 2, the number is not limited to two as in the first embodiment. There may be one, or three or more. If there is one, the configuration is easy, and if there are three or more, malfunction can be detected reliably.

  In the first and second embodiments, the maximum values of acceleration, velocity, SI value, and SSI value are measured after the level discrimination process, but are not necessarily limited to such an order. For example, measurement and notification of the maximum value may be started after the vibration sensing step.

It is a block diagram which shows the electrical structure of the earthquake evaluation apparatus 1 of this Embodiment. 1 is a front view showing an earthquake evaluation apparatus 1. FIG. It is an enlarged view which expands and shows the seismic device 2 contained in the earthquake evaluation apparatus 1. FIG. It is an expanded sectional view which expands and shows a part of seismic device 2. 3 is an enlarged perspective sectional view showing a part of the seismic device 2 in an enlarged manner. It is a graph which shows the acceleration of a vibration. It is a flowchart which shows the procedure of the earthquake evaluation method of the earthquake evaluation apparatus. It is a graph which shows the acceleration of a vibration. It is a graph which shows the speed of a vibration. It is a graph which shows SI value of a vibration. It is a graph which shows the acceleration of a vibration. It is a graph which shows the speed of a vibration. It is a graph which shows SI value of a vibration. It is a graph which divides | segments the SI value of a vibration for every time. It is a block diagram which shows the electrical structure of 1 A of earthquake evaluation apparatuses of 2nd Embodiment. It is a front view which shows 1A of earthquake evaluation apparatuses. It is a flowchart which shows the procedure of the earthquake evaluation method of 1 A of earthquake evaluation apparatuses. It is a graph which shows the acceleration of a vibration. It is a graph which shows the SSI value of a vibration.

It is a graph which shows the velocity response spectrum of the building by the simulation wave in a certain point of the Tonankai earthquake (attenuation rate 5%). It is a graph which shows the velocity response spectrum of the building by the simulation wave in a certain point of the Tonankai earthquake (attenuation rate 2%). It is a graph which shows the velocity response spectrum of the building by the simulation wave in a certain point of a Nankai earthquake (attenuation rate 5%). It is a graph which shows the velocity response spectrum of the building by the simulation wave in a certain point of a Nankai earthquake (attenuation rate 2%).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Earthquake evaluation apparatus 2,2A, 2B Seismic detector 9 Display part 30 Control part 34 Calculation part

Claims (3)

A detection process for detecting vibrations;
A calculation process for calculating a calculation value for evaluating the earthquake based on the vibration detected in the detection process;
A level discriminating step for discriminating the level of the calculation value calculated in the calculation step at a predetermined first discrimination level corresponding thereto;
A determination step of determining whether or not the calculated value is equal to or higher than a first discrimination level and continues for a predetermined duration or more,
The level discrimination step further discriminates the calculated value at a predetermined second discrimination level that is a level greater than the first discrimination level,
The determination step further determines whether or not the calculated value is equal to or higher than a second discrimination level ,
The calculated value is at least one of acceleration, velocity of vibration, and spectrum intensity of velocity response spectrum,
The spectrum intensity is a spectrum intensity SSI of a speed response spectrum Sv having a predetermined period β or more and a predetermined period γ or less, and based on a period τ that is a variable of the speed response spectrum Sv and the speed response speckle Sv.

Is the spectral intensity SSI calculated by equation (1),
The period β is a value exceeding 0 sec and less than the period γ,
The earthquake evaluation method characterized in that the period γ is a value exceeding 2.5 seconds . Detection means for detecting vibrations;
An arithmetic means for calculating an arithmetic value for evaluating the earthquake based on the vibration detected by the detecting means;
Level discriminating means for discriminating the calculated value calculated by the calculating means at a predetermined first discrimination level corresponding thereto;
Determining means for determining whether or not the calculated value is equal to or higher than a first discrimination level for a predetermined duration or more;
The level discriminating means further discriminates the calculated value at a predetermined second discrimination level which is a level larger than the first discrimination level,
The determination means further determines whether or not the calculated value is equal to or higher than a second discrimination level ,
The calculated value is at least one of acceleration, velocity of vibration, and spectrum intensity of velocity response spectrum,
The spectrum intensity is a spectrum intensity SSI of a speed response spectrum Sv having a predetermined period β or more and a predetermined period γ or less, and based on a period τ that is a variable of the speed response spectrum Sv and the speed response speckle Sv.

Is the spectral intensity SSI calculated by equation (1),
The period β is a value exceeding 0 sec and less than the period γ,
The earthquake evaluation apparatus characterized in that the period γ is a value exceeding 2.5 sec . The earthquake evaluation apparatus according to claim 2, further comprising notification means for reporting the calculated value.

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