JP6390045B2 - Earthquake detection device, force calculation method, and mass calculation method - Google Patents

Description

  The present invention relates to an earthquake detection device, a force calculation method, and a mass calculation method.

When resuming train operation after an earthquake, work is being carried out to confirm that there are no damage to structures or tracks. Specifically, from areas such as seismometer data located along the railway line, areas where strong shaking has occurred are identified, and work is being carried out to confirm that structures and trajectories have not been damaged. .
Here, the seismometers are installed with a certain interval such as 20 km (km), for example, and the magnitude of shaking at the position where the seismometer is not installed is the position where the seismometer is installed. The process of estimating from the magnitude of the shaking is performed.
In this case, it takes time and effort to estimate the magnitude of shaking at a position where no seismometer is installed, and the estimation accuracy is low. In order to increase the number of seismometers installed and reduce the labor and improve the accuracy, it is desired to reduce the unit price of the seismometers.

Here, Patent Document 1 shows a simple seismometer in which a round hole having a round hole diameter corresponding to each seismic intensity is formed in the upper part of the pedestal, and a sphere is placed on each round hole. . This simple seismometer shows the seismic intensity by the ball falling according to the seismic intensity.
According to Patent Document 1, this simple seismometer is simple, inexpensive, and accurate without requiring an expensive sensor or signal processor.

JP 2006-208231 A

  In the simple seismometer described in Patent Document 1, it is necessary to open a round hole with an accurate round hole diameter on the pedestal so that the ball falls according to the seismic intensity of the earthquake. In this respect, in order to manufacture the simple seismometer described in Patent Document 1, it is necessary to perform highly accurate processing.

  The present invention provides an earthquake detection device, a force calculation method, and a mass calculation method that can be manufactured and adjusted without the need for high-precision machining, and that can detect a shake greater than a predetermined magnitude. .

  According to the first aspect of the present invention, the earthquake detection device includes a moving part having mass, a supporting part that supports the moving part so as to be movable in a predetermined linear direction, and a fixed part that is fixed to the supporting part. And a suppressing unit that is connected to the fixed unit so as to be variable in inclination, and that suppresses movement of the moving unit in the predetermined linear direction in contact with a predetermined position of the moving unit, The maximum value of the force by which the suppressing unit suppresses the movement of the moving unit in the predetermined linear direction is a predetermined magnitude, and when the moving unit moves away from the suppressing unit, the suppressing unit changes its inclination. Let

  The suppression unit may suppress the movement of the moving unit in the predetermined linear direction by a magnetic force.

  According to the second aspect of the present invention, the force calculation method includes a moving part having mass, a supporting part that supports the moving part so as to be movable in a predetermined linear direction, and a fixed part that is fixed to the supporting part. And a suppressing unit that is connected to the fixed unit so as to be variable in inclination, and that suppresses movement of the moving unit in the predetermined linear direction in contact with a predetermined position of the moving unit, When the maximum amount of force by which the suppressing unit suppresses the movement of the moving unit in the predetermined linear direction is a predetermined size, and the moving unit moves away from the suppressing unit, the suppressing unit tilts itself. The step of installing the earthquake detecting device with the support portion being inclined with respect to the horizontal, and the support portion in which the moving portion is moved in the predetermined linear direction by gravity acting on the moving portion itself. Angle measurement to find the minimum inclination angle with respect to horizontal A method, based on the angle measured by the angle measuring step, including the force calculation step of obtaining a maximum size of a force that restrains movement of the suppression portion is in the predetermined linear direction of the moving part.

  According to the third aspect of the present invention, the mass calculation method includes a moving unit having a mass, a supporting unit that supports the moving unit so as to be movable in a predetermined linear direction, and a fixing that is fixed to the supporting unit. And a suppressing unit that is connected to the fixed unit so as to be variable in inclination, and that suppresses movement of the moving unit in the predetermined linear direction in contact with a predetermined position of the moving unit, When the maximum amount of force by which the suppressing unit suppresses the movement of the moving unit in the predetermined linear direction is a predetermined size, and the moving unit moves away from the suppressing unit, the suppressing unit tilts itself. The step of installing the earthquake detecting device with the support portion being inclined with respect to the horizontal, and the support portion in which the moving portion is moved in the predetermined linear direction by gravity acting on the moving portion itself. The angle to find the minimum inclination angle of A force calculating step for obtaining a maximum magnitude of a force by which the suppressing unit suppresses the movement of the moving unit in the predetermined linear direction based on the angle measured in the angle measuring step; When the earthquake detection device is installed with the linear direction of the horizontal direction aligned with the horizontal direction, when the acceleration of the moving unit in the predetermined linear direction exceeds a predetermined magnitude, the moving unit is in the predetermined linear direction. A mass calculating step of calculating a mass of the moving unit for performing the movement of the moving unit based on the maximum magnitude of the force calculated in the force calculating step.

  According to the present invention, the earthquake detection device can be manufactured and adjusted without the need for high-precision machining, and the earthquake detection device can detect a shake greater than a predetermined magnitude.

It is a schematic external view which shows the external appearance of the said earthquake detection apparatus in case the earthquake detection apparatus in one Embodiment of this invention is displaying the earthquake non-detection. In the same embodiment, it is a schematic external view which shows the external appearance of the said earthquake detection apparatus in case the earthquake detection apparatus is displaying the earthquake detection. In the same embodiment, it is explanatory drawing which shows direction of the force which arises in a moving part, when a guide rail is inclined from horizontal. In the same embodiment, it is a flowchart which shows the example of the process sequence in the case of adjusting so that an earthquake detection apparatus may detect the acceleration of a predetermined magnitude | size by adjusting the mass of a weight. It is explanatory drawing which shows the example of the arrangement | positioning location of the earthquake detection apparatus of the embodiment in a railway line.

Hereinafter, although embodiment of this invention is described, the following embodiment does not limit the invention concerning a claim. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.
FIG. 1 is a schematic external view showing an external appearance of the earthquake detection device when the earthquake detection device according to an embodiment of the present invention displays that an earthquake has not been detected. As shown in the figure, the earthquake detection device 1 includes a guide rail 100, a moving unit 200, and a display device 300. The moving unit 200 includes a slider 201, a weight 202, and a magnetic body 203. The display device 300 includes a fixed portion 301, a hinge 302, a rotating plate 303, a permanent magnet 304, and a display plate 305.
In a state where the earthquake detection device 1 has not detected an earthquake, the magnetic body 203 is attracted to the permanent magnet 304, whereby the moving unit 200 is fixed to the display device 300.

The earthquake detection device 1 is a device that detects an acceleration of a predetermined magnitude or more. In particular, the earthquake detection device 1 detects an earthquake of a predetermined magnitude or more by detecting an acceleration of a predetermined magnitude or more during an earthquake. In the following, the fact that the earthquake detection device 1 detects an earthquake of a predetermined magnitude or more is referred to as the earthquake detection device 1 detecting an earthquake.
The guide rail 100 is a linear rail. The guide rail 100 supports a fixing portion 301 that is fixed to the guide rail 100 itself. Further, the guide rail 100 supports the slider 201 so as to be movable in the longitudinal direction of the guide rail 100. The guide rail 100 corresponds to an example of an instruction unit. The guide rail 100 corresponds to an example of a support portion, and the longitudinal direction of the guide rail 100 corresponds to an example of a predetermined linear direction.

  The moving unit 200 is fixed to the display device 300 as described above in a state where the earthquake detection device 1 displays that the earthquake has not been detected. On the other hand, a horizontal load is generated on the moving unit 200 due to the mass of the moving unit 200 during an earthquake. When a horizontal load with acceleration larger than the magnitude of the attracting force occurs in the opposite direction to the attracting force (magnetic force) of the permanent magnet 304 acting on the magnetic body 203, the moving unit 200 moves away from the display device 300. To go.

The slider 201 is supported by the guide rail 100 so as to be movable in the longitudinal direction of the guide rail 100 as described above.
The weight 202 is provided on the slider 201. The mass of the moving unit 200 can be adjusted by adjusting the mass of the weight 202. By adjusting the mass of the moving unit 200, the magnitude of acceleration detected by the earthquake detection device 1 can be adjusted.
The magnetic body 203 is attracted to the permanent magnet 304 as described above in a state where the earthquake detection device 1 displays that no earthquake is detected. On the other hand, when a horizontal load with an acceleration greater than the magnitude of the attracting force occurs in the opposite direction to the attracting force (magnetic force) of the permanent magnet 304 acting on the magnetic body 203, the magnetic body 203 is Leave 304.

The display device 300 displays whether or not the earthquake detection device 1 has detected an earthquake (whether or not an acceleration of a predetermined magnitude or more has been detected) by the attitude of the display board 305. The attitude of the display board 305 here is the angle of the display board 305 with respect to the guide rail 100.
The fixing part 301 is fixed to the guide rail 100.
The hinge 302 connects the fixed portion 301 and the rotary plate 303 so that the rotary plate 303 can rotate relative to the fixed portion 301.

As described above, the rotating plate 303 is connected to the fixed portion 301 via the hinge 302.
A permanent magnet 304 is installed on the rotating plate 303. As described above, when the magnetic body 203 is attracted to the permanent magnet 304 and the moving unit 200 moves away from the display device 300 in the event of an earthquake, the rotating plate 303 is pulled by the moving unit 200 via the permanent magnet 304. And rotate so as to fall down toward the guide rail 100. The combination of the rotating plate 303 and the permanent magnet 304 corresponds to an example of a suppressing unit, and the permanent magnet 304 attracts the magnetic body 203 to suppress the movement of the moving unit 200 in the longitudinal direction of the guide rail 100.
Further, a display plate 305 is installed on the rotating plate 303. As the rotating plate 303 rotates relative to the fixed portion 301, the posture of the display plate 305 changes. In a state where the earthquake detection device 1 has not detected an earthquake, the display board 305 is parallel to the guide rail 100.

FIG. 2 is a schematic external view showing the appearance of the earthquake detection device 1 when the earthquake detection device 1 displays earthquake detection.
As described above, when a horizontal load with an acceleration greater than the magnitude of the attractive force occurs in the opposite direction to the attractive force (magnetic force) of the permanent magnet 304 acting on the magnetic body 203, the moving unit 200 is , Away from the display device 300. At that time, the display device 300 is pulled by the moving unit 200, and the rotating plate 303 falls toward the guide rail 100 and becomes approximately parallel to the guide rail 100.

When the rotating plate 303 falls toward the guide rail 100, the permanent magnet 304 comes into contact with the guide rail 100. A portion of the guide rail 100 in contact with the permanent magnet 304 is provided with a magnetic material, and the permanent magnet 304 is attracted to the guide rail 100.
Even when the moving unit 200 moves away from the display device 300 and returns to the display device 300, the attracting force (magnetic force) between the permanent magnet 304 and the guide rail 100, the rotating plate 303, and the display plate 305. Due to the gravity and the shape of the display device 300, the earthquake detection device 1 does not return to the state (FIG. 1) in which no earthquake is detected.

Specifically, the attractive force (magnetic force) between the permanent magnet 304 and the guide rail 100 and the gravity of the rotating plate 303 and the display plate 305 all act downward. This force acts as a force that prevents the moving unit 200 from raising the rotating plate 303 (returning from the state of FIG. 2 to the state of FIG. 1).
Further, as shown in FIGS. 1 and 2, the rotary plate 303 and the display plate 305 have a right angle. For this reason, if the moving unit 200 pushes the display plate 305 and the rotating plate 303 stands up somewhat (the rotating plate 303 slightly approaches a vertical state from a state approximately parallel to the guide rail 100), the display plate 305 is displayed. The direction of the rotary plate 303 with respect to the fixed portion 301 changes. Due to the change in the direction and angle, a force (stress) is generated in which the display plate 305 pushes back the moving unit 200 with respect to the force in which the moving unit 200 pushes the display plate 305. The display plate 305 does not stand above the position where the force by which the moving unit 200 pushes the display plate 305 and the force by which the display plate 305 pushes back the moving unit 200 is balanced.

  In this way, in the state where the earthquake detection device 1 displays the earthquake detection (FIG. 2), the display board 305 is different from the case where the earthquake detection device 1 displays the non-earthquake detection (FIG. 1). It is in a standing state (a state approximately perpendicular to the guide rail 100). The user of the earthquake detection device 1 (for example, a railroad maintenance worker who maintains the track section where the earthquake detection device 1 is installed) is in a state where the display board 305 is tilted (a state parallel to the guide rail 100), By confirming whether the display board 305 is in a standing state (a state substantially perpendicular to the guide rail 100), it is possible to determine the presence or absence of an earthquake of a predetermined magnitude or more.

The earthquake detection device 1 detects a horizontal load in the longitudinal direction of the guide rail 100, but does not detect a horizontal load in a direction perpendicular to the longitudinal direction of the guide rail 100. That is, the earthquake detection device 1 detects an earthquake shake in the longitudinal direction of the guide rail 100, but does not detect an earthquake shake in a direction perpendicular to the longitudinal direction of the guide rail 100.
On the other hand, by arranging a plurality of earthquake detection devices 1 in different directions (in the case of two, a right angle is preferable), the combination of the plurality of earthquake detection devices 1 can cause earthquakes in various directions. Can be detected. For example, the user of the earthquake detection device 1 installs the earthquake detection device 1 with the longitudinal direction of the guide rail 100 facing east and west, and sets the other rail detection device 1 with the longitudinal direction of the guide rail 100 facing north and south. Install. Then, if any one of the two earthquake detection devices 1 is displaying the earthquake detection, the user determines that there has been an earthquake of a predetermined magnitude or more.

Next, with reference to FIG. 3, the setting direction of the magnitude | size of the acceleration which the earthquake detection apparatus 1 detects is demonstrated.
FIG. 3 is an explanatory diagram showing the direction of the force generated in the moving unit 200 when the guide rail 100 is tilted from the horizontal. In the example of the figure, the longitudinal direction of the guide rail 100 is inclined by an angle θ from the horizontal direction. Note that the guide rail 100 is inclined in a direction in which the moving unit 200 side is lower than the display device 300 side.

A vector B11 indicates the magnitude and direction of gravity acting on the moving unit 200, and vectors B12 and B13 indicate vectors obtained by decomposing the vector B11. The vector B12 is a vector parallel to the longitudinal direction of the guide rail 100, and the vector B13 is a vector perpendicular to the longitudinal direction of the guide rail 100.
The gravity (vector B11) acting on the moving part 200 can be decomposed into a component parallel to the longitudinal direction of the guide rail 100 (vector B12) and a component perpendicular to the longitudinal direction of the guide rail 100 (vector B13). Among these, the component perpendicular to the longitudinal direction of the guide rail 100 is canceled by the stress from the guide rail 100.

  Further, when the component parallel to the longitudinal direction of the guide rail 100 is equal to or less than the attractive force of the permanent magnet 304, the moving unit 200 is fixed to the display device 300. On the other hand, when the component parallel to the longitudinal direction of the guide rail 100 becomes larger than the attractive force of the permanent magnet 304, the moving unit 200 is separated from the display device 300 and slides down along the guide rail 100. Therefore, by calculating the magnitude of the component parallel to the longitudinal direction of the guide rail 100, the magnitude of the acceleration detected by the earthquake detection device 1 can be obtained.

Here, the mass of the slider 201 is m, the mass of the weight 202 is M, and the angle at which the moving unit 200 starts to slide (the minimum angle at which the moving unit 200 moves away from the display device 300 and slides down along the guide rail 100). Is θ. Also, let g be the acceleration of gravity.
Then, the magnitude F of the attractive force (the magnetic force acting on the magnetic body 203) of the permanent magnet 304 is expressed by the equation (1).

  Further, when the magnitude of the acceleration detected by the earthquake detection device 1 is α, the magnitude F of the attractive force (magnetic force acting on the magnetic body 203) of the permanent magnet 304 is expressed by the equation (2).

  From the equations (1) and (2), the magnitude α of acceleration detected by the earthquake detection device 1 is expressed as in equation (3).

  When the magnitude F of the attracting force of the permanent magnet 304 is measured using a spring balance or the like, the magnitude α of acceleration detected by the earthquake detection device 1 can be calculated using Expression (4).

In the event of an earthquake, the attractive force F of the permanent magnet 304 or the mass M of the weight 202 is adjusted so that the earthquake detection device 1 detects an acceleration of a predetermined magnitude α.
For example, when adjusting the attracting force F of the permanent magnet 304, such as when selecting the permanent magnet 304 to be used from a plurality of permanent magnets 304, the attracting force of the permanent magnet 304 is obtained using the equation (2).
Moreover, the permanent magnet 304 used for the earthquake detection apparatus 1 is decided, and when adjusting the mass of the weight 202, the mass of the weight 202 can be calculated using Formula (5).

FIG. 4 is a flowchart illustrating an example of a processing procedure when adjustment is performed so that the earthquake detection apparatus 1 detects an acceleration having a predetermined magnitude α by adjusting the mass of the weight 202.
As shown in FIG. 3, the adjuster tilts the guide rail 100 with respect to the horizontal so that the moving unit 200 side is lower than the display device 300 side as shown in FIG. Install (step S101).
Then, the adjuster changes the inclination of the guide rail 100 to obtain the angle at which the moving unit 200 starts to slide (the minimum angle at which the moving unit 200 moves away from the display device 300 and slides down along the guide rail 100) θ ( Step S102).
Next, the adjuster calculates the magnitude of the attractive force F of the permanent magnet 304 using the formula (1) based on the angle θ obtained in step S102 (step S103). The processing in steps S101 to S103 corresponds to an example of processing in the force calculation method.
Then, the adjuster calculates the mass of the weight 202 using the equation (5) based on the angle θ calculated in step S103 (step S104). The process of steps S101 to S104 corresponds to an example of a mass calculation method process.
Then, the adjuster adjusts the mass of the weight 202 to the mass obtained in step S104 (step S105). Adjustment of the mass of the weight 202 is performed by shaving the weight 202 or adding (for example, pasting) a new weight to the weight 202.
After step S105, the process of FIG. 4 ends.

  FIG. 5 is an explanatory diagram illustrating an example of an arrangement location of the earthquake detection device 1 on a railway line. In the example shown in the figure, the earthquake detection devices 1 are installed at various positions such as an upper part of an overpass, an upper part and a lower part of a bridge pier, and at relatively narrow intervals. The earthquake detection device 1 has a simple structure, so that the manufacturing cost and the maintenance cost are low, and it can be easily installed because a power source is unnecessary. For this reason, the manager of the railway line can install the earthquake detection devices 1 at various positions at relatively narrow intervals.

When earthquake detectors such as seismometers are installed at relatively wide intervals, the magnitude of the shake at the position where the earthquake detector is not installed during an earthquake is the magnitude of the shake at the position where the earthquake detector is installed. It is necessary to estimate from the size. In this respect, it is impossible to accurately grasp the magnitude of the earthquake shake at the position where the earthquake detection device is not installed.
On the other hand, in the case of the earthquake detection device 1, it can be installed at a relatively narrow interval as described above, and it can be directly determined whether or not the magnitude of the shake is greater than or equal to a predetermined size at the installation position. In this regard, according to the earthquake detection device 1, it is possible to more accurately determine whether or not the magnitude of the earthquake shake at a certain position is greater than or equal to a predetermined magnitude.

As described above, the guide rail 100 supports the moving part 200 so as to be movable in the longitudinal direction of the guide rail 100, and the fixing part 301 is fixed to the guide rail 100. Further, the rotating plate 303 is connected to the fixed portion 301 via the hinge 302 so as to be variable in inclination, and the permanent magnet 304 installed on the rotating plate 303 attracts the magnetic body 203 to thereby move the moving portion. The movement of the 200 guide rails 100 in the longitudinal direction is suppressed. The maximum value of the attracting force of the permanent magnet 304 (therefore, the force by which the permanent magnet 304 suppresses the movement of the moving unit 200 in the longitudinal direction of the guide rail 100) is a predetermined value (for each permanent magnet 304). The magnitude of the magnetic force is determined. Further, when the moving unit 200 moves away from the permanent magnet 304, the rotating plate 303 changes its inclination.
The earthquake detection device 1 can have a simple structure in which these parts are combined. Further, the magnitude of acceleration detected by the earthquake detection device 1 can be adjusted by a relatively simple adjustment method of adjusting the weight of the weight 202.

  In addition, the method by which the suppressing unit (for example, the combination of the rotating plate 303 and the permanent magnet 304) suppresses the movement of the moving unit 200 in the longitudinal direction of the guide rail 100 is not limited to the method using magnetic force. For example, a hook-and-loop fastener may be provided on each of the rotating plate 303 and the moving unit 200, and the movement of the moving unit 200 in the longitudinal direction of the guide rail 100 may be suppressed by bonding these hook-and-loop fasteners. Alternatively, the rotating plate 303 may be bonded to the moving unit 200 with an adhesive to suppress the movement of the moving unit 200 in the longitudinal direction of the guide rail 100.

  On the other hand, since the permanent magnet 304 attracts the magnetic body 203 to the magnetic force, it becomes easy for the suppressing unit to make the maximum value of the force that suppresses the movement of the moving unit 200 in the longitudinal direction of the guide rail 100 constant. . In addition, when the permanent magnet 304 and the magnetic body 203 are separated (when the earthquake detection is displayed), the user of the earthquake detection device 1 easily attaches the permanent magnet 304 and the magnetic body 203 (earthquake). (Not detected) can be displayed).

  Further, the adjuster of the earthquake detection device 1 installs the earthquake detection device 1 by tilting the guide rail 100 with respect to the horizontal, and the angle at which the moving unit 200 starts to slide (the moving unit 200 moves away from the display device 300 and moves to the guide rail 100. By calculating the minimum angle at which the permanent magnet 304 slides down, the maximum magnitude of the force (magnetic force) by which the permanent magnet 304 attracts the magnetic body 203 can be determined by a simple expression such as Expression (1). it can.

Further, the adjuster of the earthquake detection device 1 can calculate the mass of the weight 202 by a simple expression such as Expression (5) based on the maximum magnitude of the force (magnetic force) that the permanent magnet 304 attracts the magnetic body 203. Can be requested.
Further, the adjuster of the earthquake detection device 1 can adjust the earthquake detection device 1 to detect a predetermined magnitude of acceleration by simple processing that matches the mass of the weight 202 with the calculated mass.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Earthquake detection apparatus 100 Guide rail 200 Moving part 201 Slider 202 Weight 203 Magnetic body 300 Display apparatus 301 Fixed part 302 Hinge 303 Rotating plate 304 Permanent magnet 305 Display board

Claims (4)

A moving part having a mass;
A support part for supporting the moving part so as to be movable in a predetermined linear direction;
A fixing part fixed to the support part;
A restraining unit that is variably connected to the fixed unit, and that suppresses movement of the moving unit in the predetermined linear direction in contact with a predetermined position of the moving unit;
With
The maximum value of the force by which the suppressing unit suppresses the movement of the moving unit in the predetermined linear direction is a predetermined magnitude, and when the moving unit moves away from the suppressing unit, the suppressing unit has its own inclination. Change,
Earthquake detection device.   The earthquake detection device according to claim 1, wherein the suppressing unit suppresses movement of the moving unit in the predetermined linear direction by magnetic force. A movable portion having a mass; a support portion that supports the movable portion so as to be movable in a predetermined linear direction; a fixed portion that is fixed to the support portion; and a tiltable connection to the fixed portion. A suppression unit that contacts the predetermined position of the moving unit and suppresses the movement of the moving unit in the predetermined linear direction, and the suppression unit moves the moving unit in the predetermined linear direction. The maximum magnitude of the restraining force is a predetermined magnitude, and when the moving part moves away from the restraining part, the restraining part changes its inclination, and the seismic detection device is disposed with respect to the support part horizontally. Installation steps to tilt and install,
An angle measuring step for obtaining a minimum inclination angle with respect to the horizontal of the support part, wherein the moving part moves in the predetermined linear direction by gravity acting on the moving part itself;
Based on the angle measured in the angle measuring step, a force calculating step for obtaining a maximum magnitude of a force by which the suppressing unit suppresses movement of the moving unit in the predetermined linear direction;
A force calculation method including A movable portion having a mass; a support portion that supports the movable portion so as to be movable in a predetermined linear direction; a fixed portion that is fixed to the support portion; and a tiltable connection to the fixed portion. A suppression unit that contacts the predetermined position of the moving unit and suppresses the movement of the moving unit in the predetermined linear direction, and the suppression unit moves the moving unit in the predetermined linear direction. The maximum magnitude of the restraining force is a predetermined magnitude, and when the moving part moves away from the restraining part, the restraining part changes its inclination, and the seismic detection device is disposed with respect to the support part horizontally. Installation steps to tilt and install,
An angle measuring step for obtaining a minimum inclination angle with respect to the horizontal of the support part, wherein the moving part moves in the predetermined linear direction by gravity acting on the moving part itself;
Based on the angle measured in the angle measuring step, a force calculating step for obtaining a maximum magnitude of a force by which the suppressing unit suppresses movement of the moving unit in the predetermined linear direction;
When the earthquake detection device is installed with the predetermined linear direction aligned with the horizontal direction, the moving unit is moved to the predetermined direction when the acceleration of the moving unit in the predetermined linear direction exceeds a predetermined magnitude. A mass calculating step for calculating a mass of the moving unit for performing movement in a linear direction based on the maximum magnitude of the force calculated in the force calculating step;
A mass calculation method including:

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