JP2006343126A - Earthquake-time alarm system of wayside seismometer along railroad line - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake-time alarm system capable of rapidly and accurately controlling a feeder in an earthquake occurring near a wayside of the railroad line. <P>SOLUTION: In the earthquake-time alarm system of wayside seismometers arranged along the railroad line, each wayside seismometer has a means for estimating an earthquake occurrence position with P wave. When only other station goes into an M-Δ regulation range according to the estimation of the earthquake occurrence position with the wayside seismometer of its own station, feeder stop of the own station is not performed on the condition that the wayside seismometer of the own station having transmitted the estimation of the focus position is out of the M-Δ regulation range. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an earthquake alarm system for a seismometer along a railway line.

  A seismometer called a seismometer along the railway line is installed at a substation for supplying electric power to the railway feeder. This alongside seismometer performs damage estimation based on the information of the coastline detection point by the coastline seismometer, but other than that, the system is configured to issue an alarm only for a large acceleration called S wave.

  Conventionally, in the event of an earthquake, regulations for safe operation have been performed on trains that operate railroad tracks in the following two procedures.

  FIG. 7 is an explanatory view of a conventional earthquake alarm system for a seismometer along a railway line.

First, as shown in FIG. 7 (a), the coastline seismometer 104 detects the P wave of the seismic wave at the coastline detection point, thereby estimating the earthquake occurrence position (seismic source position 107) and magnitude (magnitude of the earthquake). Then, the information of the estimated seismic source position 107 and magnitude is transmitted to the seismometers 101, 102, and 103 along the railway. The seismometers 101, 102, and 103 along the line immediately determine from their epicenter position 107 and magnitude information whether their position falls within the damage estimation range (regulation range) by the M-Δ method [Magnitude (M)-Epicenter distance (Δ) Method] and DI value (earthquake power per unit time) (compact uredas) method (non-patent document 1 below). As a result, as shown in FIG. 7B, when entering the damage estimation range (regulation range), the operation of stopping feeding (stopping the train) is performed. In FIG. 7, 105 is the sea and 106 is the land.
Yutaka Nakamura “Study on rational seismic intensity index values”, Proceedings of JSCE Earthquake Engineering pp. 1-4

  However, since the coastline seismometer 104 is estimated only once (implemented 3 seconds after the detection of the P wave), there is a problem that it cannot sufficiently cope with a large-scale earthquake. Further, as described above, the along-line seismometers 101, 102, and 103 do not perform the estimation by the P wave, and therefore further contrivance is necessary for the direct type earthquake that occurs near the along-line. In fact, the Niigata earthquake has occurred directly under the Joetsu Shinkansen, and countermeasures are urgently needed.

  In view of the above situation, the present invention provides an earthquake alarm system for a railway seismometer along a railway line that can quickly and accurately control electric power even with respect to an earthquake that occurs near the railway line. The purpose is to do.

In order to achieve the above object, the present invention provides
[1] In the earthquake alarm system for seismometers along railroad tracks, the seismometers along the railroad line each have means for estimating the location of the earthquake using P-waves, If only other stations are in the P-wave-based restricted range due to the estimation of the location, the local station along the seismometer that sent the epicenter location estimate is not within the P-wave-based restricted range. It is characterized by not stopping the power supply.

  [2] In the earthquake warning system for a seismometer along the railroad track as described in [1] above, a function for detecting a P wave and estimating an earthquake occurrence position after a plurality of times is added. To do.

  According to the present invention, in a seismometer warning system for seismometers located along railway lines, even if the seismometers are provided with means for estimating an earthquake occurrence position using P waves, It is possible to prevent an increase in power supply stoppage due to interference between seismometers.

  The seismometer warning system for seismometers located along railway lines is equipped with a means for each seismometer to estimate the location of the earthquake using P-waves. When only other stations are within the control range based on the M-Δ method, the station's along-line seismometer that sent the seismic source position estimation is not within the control range based on the M-Δ method. Since the station power supply was not stopped, the power station was stopped due to interference between the seismometers along the seismometers, even if the seismometers along the line had means to estimate the location of the earthquake using P waves. Can be prevented from expanding.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is an explanatory view of an earthquake alarm system for a railroad seismometer showing a first embodiment of the present invention.

  Here, the seismometers 1, 2 and 3 along the railroad track have the function of detecting the P wave, estimating the epicenter 7 and the magnitude, calculating the regulation range using the M-Δ method, and issuing an alarm. I have. That is, the function of the coastline seismometer 4 is added to the along-line seismometers 1, 2, and 3. In the case where the epicenter 7 is directly under the seismometers 1, 2, and 3 along the line, the effectiveness is limited, but the effectiveness is high for a train running in the vicinity. Moreover, the seismometers 1, 2, and 3 along the line have a function of detecting the P wave and performing additional estimation of the magnitude after 1 second, 3 seconds, and 5 seconds. As a result, it is more effective than a conventional earthquake warning system even for a very large earthquake. In the figure, 5 is the sea and 6 is the land.

  The purpose of installing the alongside seismometer is to monitor whether the area around the alongside seismometer is dangerous. The installation interval of seismometers along the railway line is about 20 km, and it is important to set the seismometer in this range so that it can be accurately captured. In addition, unlike coastline seismometers, observations are made in places with a lot of noise and vibration, so the functions of the alongside seismometers are strengthened to prevent false detections.

  However, in the above embodiment, the along-line seismometer estimates and judges each regulation range. For example, even though the along-line seismometer 3 in FIG. If the seismometer 2 determines that the along-line seismometer 3 is within the regulation range, the along-line seismometer 3 will stop feeding and may stop the train more than necessary. Therefore, further ingenuity is required.

  FIG. 2 is an explanatory view of an earthquake alarm system for a seismometer along the line showing a second embodiment of the present invention. Hereinafter, the explanation will be made focusing on the seismometer 2 along the railway.

  In this embodiment, first, each alongside seismometers 1, 2 and 3 estimate the magnitude and the location of the epicenter 7 by the P wave of the earthquake. In the case of FIG. Since it is on, it is judged that the power line is stopped along the seismometer 2 along the rail line. That is, as shown in FIG. 2 (a), when only the local station enters the restricted range, the seismometer 2 along the seismometer along the seismic source position 7's own information as shown in FIG. 2 (b). Judgment is made and the power supply is stopped.

  FIG. 3 is an explanatory view of an earthquake alarm system for a seismometer along the line showing a third embodiment of the present invention.

  In this embodiment, first, each alongside seismometers 1, 2, and 3 estimate the magnitude and the location of the epicenter 7 by the P wave of the earthquake. As shown in FIG. Even when it is determined that the total 3 is within the regulation range, only the own station is stopped. In addition, along the seismometer 3 along the line, the station stops feeding at its own discretion. That is, as shown in FIG. 3 (a), even when the local station and other stations are within the restricted range, as shown in FIG. 3 (b), along the seismometer 2 along the seismometer 2 , 3 make their own judgments and stop feeding their own stations.

  FIG. 4 is an explanatory diagram of an earthquake alarm system for a seismometer along the line showing a fourth embodiment of the present invention.

  In this embodiment, first, each alongside seismometers 1, 2, and 3 estimate the magnitude and the location of the epicenter 7 by the P wave of the earthquake. As shown in FIG. When only the total 3 is within the control range, do not stop the feeding of the seismometer 2 along the local station.

  In this way, as shown in FIG. 4 (b), the railway seismometer 3 near the epicenter 7 is not in the restricted range because it detects the P wave and stops power transmission. Estimated information of the alongside seismometer 2 is a protocol that should not be handled. In other words, by enabling the alarm only when the own station is dangerous (within the regulation range), it is possible to avoid stopping the train more than necessary.

  In the above embodiment, the restriction range is calculated using the M-Δ method, but the restriction range may be calculated using other methods.

  For example, the DI value (earthquake power per unit time) (compact uredas) method (non-patent document 1 below) may be used.

  Next, a specific example of a warning message communicated between along-line seismometers will be described.

  There are an information message and a response message as messages used in this system.

  FIG. 5 is a diagram showing a configuration example of an information message showing an embodiment of the present invention.

  The information message is a message transmitted from the seismometer along the railway line toward the receiving side.

  This information message includes the following information. (A) Time at which the earthquake was detected, (b) Observation point number at which the earthquake was detected, (c) Reason for determination when the power supply was stopped, (d) Earthquake occurrence position (estimated), (e) Estimated magnitude . The message size is fixed at 80 bytes.

  FIG. 6 is a diagram showing a configuration example of a response message showing an embodiment of the present invention.

  The response message is a message that informs the transmission side of success or failure of the message received on the reception side.

  As the contents of the response message, (1) the processing serial number of the processed message, (2) the observation point number of the processed message, and (3) the processing result flag are shown. The message size is fixed at 7 bytes.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The earthquake alarm system of the present invention can be used as a quick and accurate alarm system using a seismometer along a railway line.

It is explanatory drawing of the alarm system at the time of the earthquake of the along-railway seismometer of the railway track which shows 1st Example of this invention. It is explanatory drawing of the alarm system at the time of the earthquake of a alongside seismometer which shows 2nd Example of this invention. It is explanatory drawing of the alarm system at the time of the earthquake of a along-line seismometer which shows 3rd Example of this invention. It is explanatory drawing of the alarm system at the time of the earthquake of a alongside seismometer which shows 4th Example of this invention. It is a figure which shows the structural example of the information message | telegram which shows the Example of this invention. It is a figure which shows the structural example of the response message which shows the Example of this invention. It is explanatory drawing of the alarm system at the time of the earthquake of the conventional seismometer along a railroad track.

Explanation of symbols

1,2,3 Seismometers along railway lines 4 Coastline seismometers 5 Seas 6 Lands 7 Locations of epicenters

Claims (2)

In the earthquake warning system of the seismometer along the railway line,
Each seismometer along the railway line has a means for estimating the location of the earthquake using P-waves. A seismometer along the railroad track, which does not stop the power station on the condition that the seismometer along the railroad that sent the position estimate is not within the regulation range based on the P wave. Earthquake warning system.   A railway line alarm system for a seismometer along a railway line according to claim 1, wherein a function for detecting a P wave and estimating an earthquake occurrence position after a plurality of times is added. An earthquake warning system for seismometers along railway lines.

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