JP7226285B2 - seismic detector - Google Patents

Description

The present invention relates to seismic sensors.

Patent Literature 1 discloses an example of an emergency elevator. A seismic detector and a flood detector are provided in the emergency elevator pit. The emergency elevator control panel disables the seismic sensing signal output from the pit's seismic sensor when flooding of the pit is detected.

JP 2017-206356 A

However, in the emergency elevator of Patent Document 1, the seismic detector and the water ingress detector are provided separately. Therefore, even if the seismic sensor is submerged, the inundation detector may not detect the inundation depending on the arrangement of the seismic sensor and the inundation detector. For this reason, it is not possible to determine the effect of water entering the pit on the seismic detector.

The present invention was made to solve such problems. SUMMARY OF THE INVENTION It is an object of the present invention to provide a seismic sensor capable of determining the effects of water intrusion into a pit.

The seismic detector according to the present invention is housed in a case attached to the bottom of the pit of an elevator, and a seismometer for measuring shaking due to an earthquake and flood water pressure, which is the water pressure received by the case when the pit is flooded, are set in advance. a flood detection unit that detects that the flood water pressure exceeds the first water pressure; and a control unit that measures the flood duration time during which the flood water pressure exceeds the first water pressure.

A seismic sensor according to the present invention can determine the impact of water intrusion into a pit.

1 is a configuration diagram of an elevator according to Embodiment 1; FIG. 1 is a top view of a seismic sensor according to Embodiment 1; FIG. 1 is a side view of the seismic sensor according to Embodiment 1; FIG. 1 is a block diagram showing the configuration of an earthquake sensor according to Embodiment 1; FIG. 4 is a flow chart showing an example of the operation of the seismic sensor according to Embodiment 1; FIG. 10 is a block diagram showing the configuration of a seismic sensor according to Embodiment 2;

A mode for carrying out the present invention will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions are appropriately simplified or omitted.

Embodiment 1.
FIG. 1 is a configuration diagram of an elevator according to Embodiment 1. FIG.

The elevator 1 of FIG. 1 is applied to a building having multiple floors. A landing 2 is provided on each of a plurality of floors of the building. In the building, a hoistway 3 is provided over a plurality of floors. A pit 4 is provided at the lower end of the hoistway 3 in the elevator 1 . The pit 4 is below the landing 2 on the lowest floor. The elevator 1 includes a hoisting machine 5 , a main rope 6 , a car 7 , a counterweight 8 , a control panel 9 and a seismic sensor 10 .

The hoist 5 is provided, for example, above or below the hoistway 3 . The hoist 5 has a sheave and a motor. The sheave of the hoisting machine 5 is connected to the rotating shaft of the motor of the hoisting machine 5 . The motor of the hoisting machine 5 is a device that generates driving force for rotating the sheave of the hoisting machine 5 . The main rope 6 is wound around the sheave of the hoist 5 . A car 7 and a counterweight 8 are suspended by a main rope 6 in the hoistway 3 . The car 7 is a device that transports passengers and the like between a plurality of floors by running vertically inside the hoistway 3 . The counterweight 8 is a device that balances the load applied to the sheave of the hoisting machine 5 through the main rope 6 with the car 7 . The car 7 and the counterweight 8 travel in opposite directions in the hoistway 3 as the main rope 6 is moved by the rotation of the sheave of the hoisting machine 5 . The control panel 9 is provided, for example, above or below the hoistway 3 . A control panel 9 is a device that controls the operation of the elevator 1 . The operation of the elevator 1 includes running of the car 7, for example. The seismic sensor 10 is a device that senses shaking caused by an earthquake. The seismic sensor 10 senses initial microtremors of an earthquake, for example. A seismic sensor 10 is attached to the bottom of the pit 4 . A seismic sensor 10 is connected to the control panel 9 so as to output a sensing signal when an earthquake occurs.

Here, water may enter the building to which the elevator 1 is applied due to a typhoon, torrential rain, or the like. Since the pit 4 is located below the landing 2 on the lowest floor, there is a possibility that it will be submerged by water that has entered. Therefore, the seismic sensor 10 has protection against water. The protective performance against water is IPx7 waterproof performance, for example. Here, the protection performance against water is defined, for example, by whether or not it can withstand submersion in water for a prescribed time at a prescribed water pressure. That is, there is a possibility that the seismic sensor 10 will need to be replaced when it is submerged beyond the water pressure or time specified in the protection performance. Therefore, the seismic sensor 10 has a function of diagnosing the influence of water entering the pit 4 .

FIG. 2 is a top view of the seismic sensor according to Embodiment 1. FIG.

The seismic sensor 10 includes a case 11 , a display section 12 , a seismometer 13 and a cable 14 . A case 11 forms an outer shell of the seismic sensor 10 . The case 11 is a device that protects internal devices from intrusion of water. The display unit 12 is a part that displays input display information. The display information is, for example, information that is checked in the pit 4 by maintenance personnel who perform maintenance and inspection work. The display information is information representing the operating state of the seismic sensor 10 and the like. The display unit 12 is, for example, a display or an LED lamp (LED: Light Emitting Diode). The display section 12 may be exposed on the outer surface of the case 11 . The seismometer 13 is a device that measures shaking caused by an earthquake. The seismometer 13 is housed in the case 11 . The cable 14 is a device for communicating sensing signals and the like when an earthquake occurs.

3 is a side view of the seismic sensor according to Embodiment 1. FIG.

A case 11 of the seismic sensor 10 is attached to the bottom surface of the pit 4 by, for example, a bracket 15 or the like. The bracket 15 is fixed to the bottom surface of the pit 4 by chemical anchors, for example, so that the case 11 can be stably attached to the bottom surface of the pit 4 .

The seismic sensor 10 includes a submergence detector 16 . The submergence detector 16 has a water pressure gauge 17 . The water pressure gauge 17 is provided below the seismic sensor 10, for example. The water pressure gauge 17 may be exposed on the outer surface of the case 11 . The water pressure gauge 17 is a device that measures flood water pressure. The flood water pressure is the water pressure that the case 11 receives when the pit 4 is flooded. When the pit 4 is not submerged, the water pressure gauge 17 outputs 0 as the measured value, for example. Alternatively, when the pit 4 is not submerged, the water pressure gauge 17 may output the air pressure value as the measured value, for example.

In this example, the flood detection unit 16 determines the degree of flooding of the pit 4 by comparing the measured flood water pressure with a reference value of water pressure. In the flood detection unit 16, a first water pressure is set in advance as a reference value of water pressure. The first water pressure is, for example, a prescribed water pressure in protective performance against water. In the flood detection unit 16, a second water pressure is set in advance as another reference value for water pressure. The second water pressure is higher than the first water pressure. The second water pressure is, for example, the upper limit water pressure at which the operation of the seismic sensor 10 is guaranteed. In the flood detection unit 16, a third water pressure is set in advance as another reference value for water pressure. The third water pressure is higher than the first water pressure. The third water pressure is lower than the second water pressure.

4 is a block diagram showing the configuration of the seismic sensor according to Embodiment 1. FIG.

The seismic sensor 10 has a battery 18 and a controller 19 .

The battery 18 is a device that supplies power to at least one of devices that constitute the seismic sensor 10 , such as the seismometer 13 , the flood detection unit 16 , and the control unit 19 . A battery 18 is housed in the case 11 . The battery 18 has a function of storing power. During normal operation of the elevator 1, the battery 18 receives power from a power supply external to the seismic sensor 10, for example. The battery 18 stores power supplied from an external power supply. For example, when power is not supplied from an external power source, such as during a power outage, the battery 18 supplies the stored power to the devices constituting the seismic sensor 10 .

The controller 19 is a part that controls the operation of the seismic sensor 10 . The controller 19 is housed in the case 11 . The control unit 19 has a function of generating a sensing signal based on the shaking measured by the seismometer 13 . The control unit 19 generates a sensing signal, for example, when the shaking measured by the seismometer 13 exceeds a preset reference value. The controller 19 is connected to the control panel 9 through the cable 14 so as to output the generated sensing signal. The control unit 19 has a counting function that counts up the count value at regular intervals. The control unit 19 is equipped with a counter that stores count values. The counting function of the control unit 19 is a function of counting up by adding 1 to the count value at regular intervals from the time the count is started until the count is stopped. The control unit 19 may set the count value to 0 when stopping counting. The count value of the counter is set to 0 during normal operation of the elevator 1, for example. At this time, counting is stopped.

An example of the hardware configuration of the control unit 19 will be described with reference to FIG.

Each function of the control unit 19 can be realized by a processing circuit. The processing circuitry comprises at least one processor 19a and at least one memory 19b. The processing circuitry may comprise at least one piece of dedicated hardware along with or in place of the processor 19a and memory 19b.

Each function of the control unit 19 is implemented by software, firmware, or a combination of software and firmware. At least one of software and firmware is written as a program. The program is stored in memory 19b. The processor 19a realizes each function of the control unit 19 by reading and executing programs stored in the memory 19b. A counting function of the control unit 19 is realized by, for example, the processor 19a. The function of the counter of the control unit 19 is realized by the memory 19b, for example.

The processor 19a is also called a CPU (Central Processing Unit), a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP. The memory 19b is composed of non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, EEPROM, or the like.

Where the processing circuitry comprises dedicated hardware, the processing circuitry may be implemented, for example, in single circuits, multiple circuits, programmed processors, parallel programmed processors, ASICs, FPGAs, or combinations thereof.

Each function of the control unit 19 can be implemented by a processing circuit. Alternatively, each function of the control unit 19 can be collectively realized by a processing circuit. A part of each function of the control unit 19 may be realized by dedicated hardware, and the other part may be realized by software or firmware. Thus, the processing circuit implements each function of the control unit 19 with dedicated hardware, software, firmware, or a combination thereof.

Next, an example of operation of the seismic sensor 10 will be described with reference to FIG.
5 is a flowchart showing an example of the operation of the seismic sensor according to Embodiment 1. FIG.

In step S1, the flood detection unit 16 determines whether the flood water pressure measured by the water pressure gauge 17 has exceeded a first water pressure. If the determination result is No, the operation of the seismic sensor 10 proceeds to step S1 again after a preset time has elapsed. Here, when counting has started, the control unit 19 may stop counting. On the other hand, when the determination result is Yes, the operation of the seismic sensor 10 proceeds to step S2.

In step S2, the control unit 19 determines whether the count value of the counter is zero. If the determination result is Yes, the operation of the seismic sensor 10 proceeds to step S3. If the determination result is No, the operation of the seismic sensor 10 proceeds to step S4.

In step S3, the control section 19 starts counting. After that, the operation of the seismic sensor 10 proceeds to step S4.

In step S4, the control unit 19 determines whether the count value is equal to or less than the upper count limit. The count upper limit is a count value corresponding to the alarm reference time. The alarm reference time is a preset time. The alarm reference time is, for example, a prescribed time in protection performance against water. The count upper limit is, for example, a value obtained by dividing the alarm reference time by the count period. If the determination result by the control unit 19 is Yes, the operation of the seismic sensor 10 proceeds to step S5. If the determination result is No, the operation of the seismic sensor 10 proceeds to step S8.

In step S<b>5 , the control unit 19 acquires the measured value of flood water pressure from the water pressure gauge 17 . The control unit 19 determines whether the flood water pressure exceeds the third water pressure. If the determination result is No, the operation of the seismic sensor 10 proceeds to step S1. If the determination result is Yes, the operation of the seismic sensor 10 proceeds to step S6.

In step S<b>6 , the control unit 19 outputs the display information of the caution display to the display unit 12 . The caution display is information for alerting maintenance personnel or the like indicating that the seismic sensor 10 has been submerged at a third water pressure higher than the first water pressure. The display unit 12 displays display information of caution display. The display information of the caution display may be displayed continuously until it is reset by maintenance personnel, for example. The display information of the caution display is reset, for example, by the operation of the seismic sensor 10 by the maintenance staff after confirmation by the maintenance staff who performs the maintenance and inspection work after the flooding event subsides. After the control unit 19 outputs the display information of the caution display, the operation of the seismic sensor 10 proceeds to step S7.

In step S<b>7 , the control unit 19 determines whether the submerged water pressure obtained from the water pressure gauge 17 exceeds the second water pressure. If the determination result is No, the operation of the seismic sensor 10 proceeds to step S1. If the determination result is Yes, the operation of the seismic sensor 10 proceeds to step S8.

In step S8, the control unit 19 notifies the control panel 9 of the abnormality. The control panel 9 that has received the report from the seismic detector 10 may report the abnormality to, for example, an information center that collects information on the elevator 1 . The notification is confirmed by, for example, a manager of the elevator 1 or a supervisor or maintenance staff of the information center. The operation of the seismic sensor 10 ends after the control unit 19 reports the abnormality.

As described above, the seismic sensor 10 includes the seismometer 13 , the flood detection section 16 and the control section 19 . The seismometer 13 is housed in the case 11 . Case 11 is attached to the bottom surface of pit 4 . A seismometer 13 measures the shaking caused by an earthquake. The flood detection unit 16 detects that the flood water pressure exceeds the first water pressure when the pit 4 is flooded. The flood water pressure is the water pressure that the case 11 receives when the pit 4 is flooded. The first water pressure is a preset water pressure value. The control unit 19 measures the duration of flooding during which the flooding water pressure exceeds the first water pressure.

Since the seismic sensor 10 itself has the submergence detection unit 16, the submergence situation around the seismic sensor 10 is obtained. The control unit 19 measures the submergence duration time based on the acquired submergence situation around the seismic sensor 10 . Therefore, based on the information on the submersion duration time measured by the control unit 19, the influence of the water entering the pit 4 on the seismic sensor 10 can be determined more accurately. Note that the control unit 19 of the seismic sensor 10 may store information on the measured duration of flooding. For example, maintenance personnel who perform maintenance and inspection work after the submergence event can determine the impact of the flood on the seismic sensor 10 based on the information stored in the seismic sensor 10 . As a result, the accuracy of determining whether or not the seismic sensor 10 needs to be replaced can be improved.

In addition, the control unit 19 measures the submersion duration time using a counter that is counted up at regular intervals.

Thereby, the control unit 19 can measure the submersion duration time with a simple configuration. In addition, when the duration of flooding is measured by a counting function such as a CPU that generates sensing signals based on the shaking measured by the seismometer 13, the seismic detector 10 does not require additional hardware for measuring time. do not.

In addition, the control unit 19 issues an abnormality alarm when the flood duration time exceeds the alarm reference time. The alarm reference time is a preset reference value of time.

For example, when the seismic sensor 10 is submerged under a condition that exceeds the protection performance against water, the control unit 19 reports an abnormality. As a result, the manager of the elevator 1 or the like can quickly grasp that the earthquake sensor 10 has been greatly affected by the alarm. Therefore, an administrator or the like can quickly determine whether or not the seismic sensor 10 needs to be replaced. As a result, the restoration work after the submergence event is settled will be smoother.

The submergence detector 16 also has a water pressure gauge 17 . A water pressure gauge 17 measures the flood water pressure when the pit 4 is flooded.

The influence of flooding on the seismic sensor 10 is evaluated by water pressure, which is a continuous physical quantity. Therefore, the influence of the intrusion of water into the pit 4 on the seismic sensor 10 can be determined more accurately.

Also, the control unit 19 issues an alarm when the flood water pressure exceeds the second water pressure. The second water pressure is a preset water pressure value. The second water pressure is higher than the first water pressure.

As the pit 4 flooding event progresses, the flood water pressure gradually increases. Therefore, when the flood detection unit 16 detects flooding due to the flood water pressure exceeding the first water pressure, the control unit 19 does not immediately report an abnormality. An event that causes flooding is often a wide-area disaster such as a typhoon. Even in such a situation, the control unit 19 can suppress the impact on disaster response by not issuing more than necessary alarms.

The seismic sensor 10 also has a display unit 12 . The display unit 12 displays input display information in the pits 4 . The control unit 19 inputs display information for warning display to the display unit 12 when the flood water pressure exceeds the third water pressure. The third water pressure is a preset water pressure value. The third water pressure is higher than the first water pressure. The third water pressure is lower than the second water pressure.

When the pit 4 is flooded, the seismic sensor 10 does not need to report an abnormality immediately, but it may be subjected to water pressure to such an extent that it is preferable to check whether there is any influence during regular maintenance and inspection. By setting the third water pressure to such a medium water pressure, the seismic sensor 10 can alert maintenance personnel or the like by display. As a result, even after the submergence event has subsided, the effect of the ingress of water into the pit 4 on the seismic sensor 10 can be determined more accurately.

The seismic sensor 10 also includes a battery 18 . Battery 18 stores power. The battery 18 supplies the stored electric power to at least one of the seismometer 13 , the flood detection unit 16 and the control unit 19 . As a result, the operation of the seismic detector 10 is continued even when a power outage occurs with flooding. Note that the battery may be provided outside the seismic sensor 10 . The battery may be provided inside the control panel 9, for example. For example, when power is not supplied from an external power source such as during a power outage, a battery provided in the control panel 9 or the like supplies stored power to the devices constituting the seismic sensor 10 . Electric power stored in the battery is transmitted by cable 14 . The power transmitted by cable 14 is supplied to at least one of seismometer 13 , flood detector 16 , and controller 19 . Even with the power supply through the cable 14, the operation of the seismic sensor 10 is continued even when a power outage occurs due to flooding.

It should be noted that the control unit 19 may report an abnormality based on both the flood water pressure and the flood duration time. For example, the relationship between flood water pressure and flood duration for which an abnormality is issued may be set based on experimentally confirmed data on the relationship between flood water pressure, flood duration, and the effects of flooding.

Further, the control unit 19 may issue a warning of abnormality when the value of the evaluation function exceeds a preset threshold value. The evaluation function is a monotonically non-decreasing function for both flood water pressure and flood duration. The evaluation function is, for example, the product or linear combination of flood pressure and flood duration. As a result, the control unit 19 can report an abnormality in consideration of the effects of both the flood water pressure and the duration of the flood. Moreover, the control unit 19 may combine a plurality of conditions for reporting an abnormality.

Also, the first water pressure may be a water pressure value higher than the measured value of the water pressure gauge 17 when the water pressure gauge 17 is not submerged in consideration of the measurement error of the water pressure gauge 17 . At this time, if the submerged water pressure exceeds the first water pressure, it can be determined that the case 11 of the seismic sensor 10 is in contact with water even if the measurement error of the water pressure gauge 17 is considered. In this case, the second water pressure may be the prescribed water pressure in the protective performance against water. By setting the first water pressure and the second water pressure in this way, the control unit 19 can control the seismic sensor 10 when the seismic sensor 10 is submerged under conditions exceeding either the specified water pressure or the specified time in the protective performance against water. Abnormalities can be reported.

Embodiment 2.
In the second embodiment, the differences from the example disclosed in the first embodiment will be described in detail. Any feature of the example disclosed in the first embodiment may be employed for features not described in the second embodiment.

The flood detection unit 16 has a first deformation section 20a, a second deformation section 20b, a third deformation section 20c, and a first switch 21a, a second switch 21b, and a third switch 21c.

Each of first deformation portion 20 a , second deformation portion 20 b , and third deformation portion 20 c is provided on the surface of case 11 . The first deformable portion 20a is a portion that deforms when receiving pressure exceeding the first water pressure. The second deformable portion 20b is a portion that deforms when receiving pressure exceeding the second water pressure. The third deformable portion 20c is a portion that deforms when receiving pressure exceeding the third water pressure. Each of the first deforming portion 20a, the second deforming portion 20b, and the third deforming portion 20c is a convex portion that is recessed inside the case 11 when subjected to pressure exceeding the deformation pressure, for example. The deformation pressure of the first deformation portion 20a is adjusted by the shape of the first deformation portion 20a, such as the thickness or size. The deformation pressure may be adjusted by the material of the first deformation portion 20a. The deformation pressure of the second deformation portion 20b may be adjusted in the same manner as for the first deformation portion 20a. Moreover, the deformation pressure of the third deformation portion 20c may be adjusted by the same method as that for the third deformation portion 20c. Each of the first deforming portion 20a, the second deforming portion 20b, and the third deforming portion 20c may have a mechanism for restoring the state before being deformed by a spring inside the case 11, for example.

The first switch 21a is a switch that detects deformation of the first deformation portion 20a. The first switch 21a detects the deformation of the first deformation portion 20a, for example, by being pressed when the first deformation portion 20a is recessed inward. The flood detection unit 16 detects that the flood water pressure exceeds the first water pressure by detecting the deformation of the first deformation portion 20a by the first switch 21a. Similarly, the flood detection section 16 detects that the flood water pressure exceeds the second water pressure by detecting the deformation of the second deformation section 20b by the second switch 21b. Similarly, the flood detection section 16 detects that the flood water pressure exceeds the third water pressure by detecting the deformation of the third deformation section 20c by the third switch 21c. The seismic sensor 10 according to the second embodiment detects that the submerged water pressure exceeds the first water pressure, the second water pressure, and the third water pressure based on the water pressure gauge 17 of the seismic sensor 10 according to the first embodiment. Instead, it is detected based on the deformation of the first deformation portion 20a, the second deformation portion 20b, and the third deformation portion 20c.

As described above, the flood detector 16 of the seismic sensor 10 according to the second embodiment has the first deformable portion 20a on the surface of the case 11 . The first deformable portion 20a is a portion that deforms when receiving pressure exceeding the first water pressure. The first water pressure is a preset water pressure value. The flood detection unit 16 detects that the flood water pressure exceeds the first water pressure based on the deformation of the first deformation portion 20a when the pit 4 is flooded.

The flood detection unit 16 does not require power to detect that the flood water pressure exceeds the first water pressure. Therefore, even when a power failure occurs, the flood detection unit 16 can operate stably. In addition, the seismic sensor 10 can accommodate electrical parts such as the switch of the flood detection unit 16 inside the case 11 . Thereby, the protection performance against water of the seismic sensor 10 can be further enhanced.

Also, the submergence detection unit 16 has a second deformation portion 20b on the surface of the case 11 . The second deformable portion 20b is a portion that deforms when receiving pressure exceeding the second water pressure. The second water pressure is a preset water pressure value. The second water pressure is higher than the first water pressure. The control unit 19 issues an abnormality notification when the second deformation portion 20b deforms when the pit 4 is flooded.

As the pit 4 flooding event progresses, the flood water pressure gradually increases. Therefore, when the flood detection unit 16 detects flooding due to the flood water pressure exceeding the first water pressure, the control unit 19 does not immediately report an abnormality. An event that causes flooding is often a wide-area disaster such as a typhoon. Even in such a situation, the control unit 19 can suppress the impact on disaster response by not issuing more than necessary alarms.

The seismic sensor 10 also has a display unit 12 . The display unit 12 displays input display information in the pits 4 . The submergence detector 16 has a third deformable portion 20c on the surface of the case 11 . The third deformable portion 20c is a portion that deforms when receiving pressure exceeding the third water pressure. The third water pressure is a preset water pressure value. The third water pressure is higher than the first water pressure. The third water pressure is lower than the second water pressure. The control unit 19 inputs the display information of the caution display to the display unit 12 when the third deformation portion 20c is deformed when the pit 4 is submerged.

When the pit 4 is flooded, the seismic sensor 10 does not need to report an abnormality immediately, but it may be subjected to water pressure to such an extent that it is preferable to check whether there is any influence during regular maintenance and inspection. By setting the third water pressure to such a medium water pressure, the seismic sensor 10 can alert maintenance personnel or the like by display. As a result, even after the submergence event has subsided, the effect of the ingress of water into the pit 4 on the seismic sensor 10 can be determined more accurately.

1 elevator 2 landing 3 hoistway 4 pit 5 hoisting machine 6 main rope 7 cage 8 counterweight 9 control panel 10 seismic sensor 11 case 12 display unit 13 seismograph 14 Cable 15 Bracket 16 Submersion Detector 17 Water Pressure Gauge 18 Battery 19 Controller 19a Processor 19b Memory 20a First Deformation Part 20b Second Deformation Part 20c Third Deformation Part 21a First Switch , 21b second switch, 21c third switch

Claims (12)

A seismometer that is housed in a case that can be attached to the bottom of the elevator pit to measure the vibration caused by an earthquake,
a flood detection unit that detects that a flood water pressure, which is the water pressure that the case receives when the pit is flooded, exceeds a preset first water pressure;
a control unit that measures a duration of flooding during which the flooding water pressure exceeds the first water pressure;
A seismic detector with The seismic sensor according to claim 1, wherein the control unit measures the submersion duration time with a counter that counts up at a constant cycle. 3. The seismic sensor according to claim 1, wherein the control unit issues an alarm when the flooding duration exceeds a preset alarm reference time. The seismic sensor according to any one of claims 1 to 3, wherein the flood detection unit has a water pressure gauge that measures the flood water pressure when the pit is flooded. 5. The seismic sensor according to claim 4, wherein the control section issues an alarm when the submerged water pressure exceeds a preset second water pressure higher than the first water pressure. a display unit for displaying input display information in the pit,
6. The control unit according to claim 5, wherein when the submerged water pressure exceeds a preset third water pressure that is higher than the first water pressure and lower than the second water pressure, the display information for warning display is input to the display unit. earthquake detector. The seismic sensor according to any one of claims 4 to 6, wherein the control unit issues an abnormality report based on the flood water pressure and the flood duration time. 8. The seismic sensor according to claim 7, wherein the controller issues an anomaly when a value of a monotonically non-decreasing evaluation function with respect to the inundation water pressure and the inundation duration exceeds a preset threshold value. The submergence detection unit has a first deformation portion on the surface of the case that deforms when subjected to pressure exceeding the first water pressure, and when the pit is submerged, the deformation of the first deformation portion causes the deformation of the first deformation portion. The seismic sensor according to any one of claims 1 to 3, which detects that flood water pressure exceeds the first water pressure. The submergence detection unit has a second deformation portion on the surface of the case that deforms when receiving pressure exceeding a preset second water pressure higher than the first water pressure,
10. The seismic sensor according to claim 9, wherein the control section issues an alarm when the second deformation section deforms when the pit is submerged. a display unit for displaying input display information in the pit,
The submergence detection unit has a third deformable portion on the surface of the case that deforms when subjected to pressure exceeding a preset third water pressure higher than the first water pressure and lower than the second water pressure,
11. The seismic sensor according to claim 10, wherein the control section inputs display information of a warning display to the display section when the third deformation section deforms when the pit is flooded. The seismic sensor according to any one of claims 1 to 11, further comprising a battery that stores electric power and supplies the stored electric power to at least one of the seismometer, the flood detection section, and the control section.

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