JPH0340280B2 - - Google Patents
Info
- Publication number
- JPH0340280B2 JPH0340280B2 JP58155959A JP15595983A JPH0340280B2 JP H0340280 B2 JPH0340280 B2 JP H0340280B2 JP 58155959 A JP58155959 A JP 58155959A JP 15595983 A JP15595983 A JP 15595983A JP H0340280 B2 JPH0340280 B2 JP H0340280B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- spacer
- line sensor
- underground
- longitudinal direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000013307 optical fiber Substances 0.000 claims description 27
- 125000006850 spacer group Chemical group 0.000 claims description 15
- 230000005856 abnormality Effects 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
Description
【発明の詳細な説明】
［発明の背景と目的］
本発明は、地下ケーブル及びその管路、ガス管
及び水道管等の地中埋設物の掘削による外傷、地
盤沈下等による異常の監視をする地中埋設物監視
システムに関するものである。[Detailed Description of the Invention] [Background and Objectives of the Invention] The present invention monitors abnormalities caused by ground subsidence, damage caused by excavation of underground cables and their conduits, gas pipes, water pipes, etc. This relates to an underground object monitoring system.
従来、掘削及び地盤沈下等による地中埋設物の
異常の検知方法は少なく、電力ケーブルにあつて
は損傷による劣化によつて探傷後、絶縁破壊する
迄不明である場合が多く、絶縁破壊による停電の
防止対策を外傷を受けた直後実施することは困難
であつた。またガス管及び水道管等もガス漏れ及
び水漏れが起こつて始めて過去に受けた外傷が原
因であつたことに気付く状況である。 Conventionally, there are few methods for detecting abnormalities in underground objects due to excavation and ground subsidence, and in the case of power cables, it is often unknown until insulation breaks down after inspection due to deterioration due to damage, and power outages due to insulation breakdown. It has been difficult to implement preventive measures immediately after receiving an injury. In addition, it is only when gas or water leaks occur in gas pipes, water pipes, etc. that it becomes clear that the cause was trauma sustained in the past.
また、重要な埋設物はセンサーを付属して埋設
する方法もあるが局部的な検出方法であり、ライ
ン状のセンサーではない一方、絶縁電線例えばパ
イロツトケーブルなどをセンサーとして用いた場
合は、その切断によつて始めて外傷を検知する方
法であり、その切断に至る前の外傷やパイロツト
ケーブルの局部的な横圧等の外力を検知すること
は不可能である。 In addition, there is a method of burying important buried objects with a sensor attached, but this is a local detection method and is not a linear sensor.However, if an insulated wire such as a pilot cable is used as a sensor, cutting it This method detects external force only by detecting external force such as external force such as external force such as external force such as external force such as external force such as external force such as external force such as external force or local lateral pressure of the pilot cable before it is severed.
更に、地中に埋設したパイロツトケーブルによ
る検知では、地中迷走電流や地中のケーブルの電
磁誘導により感度が著しく制限されることがあ
る。又地中埋設において長手方向の検知する場合
には、センサーの腐食対策が必要となる。 Furthermore, the sensitivity of detection using a pilot cable buried underground may be severely limited by underground stray currents and electromagnetic induction of the underground cable. In addition, when detecting in the longitudinal direction when buried underground, countermeasures against corrosion of the sensor are required.
本発明の目的は、前記従来技術の欠点を解消
し、地中埋設物の異常を容易に検知し、警報を発
生させる光フアイバを使用したラインセンサーを
含む地中埋設物の異常監視システムを提供するこ
とにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide an underground underground object abnormality monitoring system that eliminates the drawbacks of the prior art and includes a line sensor using optical fibers that easily detects abnormalities in underground objects and generates an alarm. It's about doing.
［発明の概要］
本発明の地中埋設物の異常監視システムは、光
フアイバを保持するスペーサにその長手方向に所
定のピツチで複数の欠落部を設け、該各欠落部を
順次通過させて前記光フアイバが長手方向に波形
状に前記スペーサに保持し、外力により容易に該
光フアイバの伝送損失が発生するように構成した
ことを特徴とするものである。[Summary of the Invention] The abnormality monitoring system for underground objects of the present invention provides a plurality of missing portions at a predetermined pitch in the longitudinal direction of a spacer holding an optical fiber, and passes through each of the missing portions sequentially to detect the above-mentioned The present invention is characterized in that the optical fiber is held by the spacer in a wave shape in the longitudinal direction, so that transmission loss of the optical fiber can easily occur due to external force.
［実施例］
以下、本発明について実施例を用いて図面によ
り具体的に説明する。[Examples] Hereinafter, the present invention will be specifically described using examples and drawings.
第１図は、本発明のシステムにおけるラインセ
ンサー５内のスペーサ２に、光フアイバ１を螺旋
状に巻きつけた状態の一例を示す説明図である。
スペーサ２には、所定のピツチで欠落部が設けら
れ、光フアイバ１はその欠落部を順次通過するよ
う装着されることにより、スペーサ２に長手方向
に波形状に保持されている。そのため、横圧Ｐ又
は張力Ｑが発生するとラインセンサー５の内部に
圧縮又は張力が発生しスペーサ２に接した部分の
光フアイバ１に微少曲げが生じ、伝送損失が増大
するようにした構造である。 FIG. 1 is an explanatory diagram showing an example of a state in which an optical fiber 1 is spirally wound around a spacer 2 in a line sensor 5 in the system of the present invention.
The spacer 2 is provided with cutout portions at a predetermined pitch, and the optical fiber 1 is held in the spacer 2 in a wave shape in the longitudinal direction by passing through the cutout portions one after another. Therefore, when lateral pressure P or tension Q occurs, compression or tension is generated inside the line sensor 5, causing slight bending in the portion of the optical fiber 1 in contact with the spacer 2, which increases transmission loss. .
スペーサ２の材質としては、軽くて伸長性の大
きいプラスチツク系及びゴム系が望ましいが、横
圧が発生しやすい地帯に設置する場合などには金
属製でもよい。 The material of the spacer 2 is preferably plastic or rubber, which are light and have high extensibility, but metal may be used when the spacer is installed in an area where lateral pressure is likely to occur.
第２図は、本発明におけるラインセンサー５が
引込み布設時に異常張力を受けないようメツセン
ジヤー方式としたラインセンサーを示す断面図で
あり、第２図ａは断面ヒヨウタン形ラインセンサ
ーの断面図、第２図ｂは断面矩形ラインセンサー
の断面図である。 FIG. 2 is a cross-sectional view showing a line sensor of the present invention which uses a messenger system so that the line sensor 5 does not receive abnormal tension when being pulled in and installed, and FIG. Figure b is a sectional view of a line sensor with a rectangular cross section.
ラインセンサー５を引込み布設する際にライン
センサー５がメツセンジヤーが方式でないと、布
設時から光フアイバ１に微少曲げが生じることに
なるため、ラインセンサー５をメツセンジヤー方
式とし、布設後メツセンジヤーワイヤー４の両端
をルーズ化することにより、ラインセンサーには
張力がかからないですむ。又、スペーサ２の断面
の中心を通るようにメツセンジヤーワイヤーを取
り付けてもよい。 When the line sensor 5 is drawn in and laid, if the line sensor 5 does not use the messenger wire method, a slight bend will occur in the optical fiber 1 from the time of installation. By making both ends loose, no tension is applied to the line sensor. Alternatively, a messenger wire may be attached so as to pass through the center of the cross section of the spacer 2.
第３図は本発明による地中埋設物異常監視シス
テムの一実施例を示す説明図であり、ラインセン
サー５の光フアイバ１の一方端に発光素子６を備
え、他方端に受光素子７を備え、横圧Ｐ又は張力
Ｑが発生した場合光フアイバの伝送損失を受光素
子がとらえ、時間微分回路８により異常を検知す
ると共に、警報回路９により警報を発するもので
ある。 FIG. 3 is an explanatory diagram showing an embodiment of the underground buried object abnormality monitoring system according to the present invention, in which a light emitting element 6 is provided at one end of the optical fiber 1 of the line sensor 5, and a light receiving element 7 is provided at the other end. , when lateral pressure P or tension Q occurs, the light receiving element captures the transmission loss of the optical fiber, the time differentiation circuit 8 detects an abnormality, and the alarm circuit 9 issues an alarm.
更に第４図に示すように、光フアイバ１の一方
端に周知の光パルス測定器を装得ることにより、
異常発生地点を知ることができる。光パルス測定
器１０からパルス信号を発信すると、該パルス信
号が光フアイバ中を伝わつていく際に光フアイバ
の中で散乱光が発生する。この散乱光のうち、パ
ルス測定器１０の方向へ戻つてくる散乱光の強度
変化を時間的に測定することによつて、光フアフ
イバの異常発生地点を検知できる。 Furthermore, as shown in FIG. 4, by equipping one end of the optical fiber 1 with a well-known optical pulse measuring device,
You can know the location of the abnormality. When a pulse signal is transmitted from the optical pulse measuring device 10, scattered light is generated within the optical fiber as the pulse signal travels through the optical fiber. Of this scattered light, by measuring over time the intensity change of the scattered light that returns in the direction of the pulse measuring device 10, the point where an abnormality has occurred in the optical fiber can be detected.
即ち、光フアイバに外部圧力が加わつていない
状態でパルス信号を発信させると、パルス測定器
へ戻つてくる散乱光は時間と共に滑らかに減衰す
るが、光フアイバに外部圧力が加わると、その部
分において光フアイバの伝送損失量が増大するた
め、パルス測定器へ戻つてくる散乱光の強度変化
は、その散乱光の強度を時系列的に見ると、ある
時間において急激に減衰した波形となる。 In other words, when a pulse signal is transmitted with no external pressure applied to the optical fiber, the scattered light that returns to the pulse measuring instrument decays smoothly over time, but when external pressure is applied to the optical fiber, that part Since the amount of transmission loss in the optical fiber increases, the intensity change of the scattered light returning to the pulse measuring device becomes a waveform that rapidly attenuates at a certain time when the intensity of the scattered light is viewed in time series.
従つて、その急激に変化した時間を読み取るこ
とにより、光フアイバの光損失個所、即ち外部圧
力が加わつた位置を検知することができるのであ
る。 Therefore, by reading the time at which the sudden change occurs, it is possible to detect the location of optical loss in the optical fiber, that is, the location where external pressure is applied.
［発明の効果］
上記に詳しく説明したように、本発明によれば
次のような顕著な効果を奏するものである。[Effects of the Invention] As explained in detail above, the present invention provides the following remarkable effects.
(1) 長手方向に所定のピツチで欠落部を設けたス
ペーサに光フアイバを長手方向に波形状に保持
させたことで、外力により光フアイバの伝送損
失が容易に発生し、異常が発生したことが容易
に検知できる。(1) By holding the optical fiber in a wavy shape in the longitudinal direction using a spacer with gaps at a predetermined pitch in the longitudinal direction, transmission loss in the optical fiber easily occurs due to external force, causing abnormalities. can be easily detected.
(2) 光フアイバの電気的誘導がないため、地中迷
走電流、電力ケーブル及び雷の影響がない。(2) There is no electrical induction of optical fibers, so there is no influence from underground stray currents, power cables, or lightning.
(3) 光パルス測定器を用いることにより、異常光
パルスから異常発生地点の測定が可能である。(3) By using an optical pulse measuring device, it is possible to measure the point where an abnormality occurs from the abnormal optical pulse.
(4) 銅線と比較して、光フアイバを用いているた
め地中埋設物として防蝕性がある。(4) Compared to copper wire, it uses optical fiber, so it is more corrosion resistant when buried underground.
第１図は、光フアイバをスペーサへ装着したと
きの状態を示す説明図、第２図は、ラインセンサ
ーを示す断面図、第３図は本発明の一実施例を示
す説明図、第４図は本発明の他の実施例を示す説
明図である。
１：光フアイバ、２：スペーサ、３：被覆材、
４：メツセンジヤーワイヤー、５：ラインセンサ
ー、６：発光素子、７：受光素子、８：時間微分
回路、９：警報回路、１０：光パルス測定器、
Ｐ：横圧、Ｑ：張力。
Fig. 1 is an explanatory diagram showing the state when the optical fiber is attached to the spacer, Fig. 2 is a sectional view showing the line sensor, Fig. 3 is an explanatory diagram showing an embodiment of the present invention, and Fig. 4 FIG. 2 is an explanatory diagram showing another embodiment of the present invention. 1: Optical fiber, 2: Spacer, 3: Covering material,
4: Messenger wire, 5: Line sensor, 6: Light emitting element, 7: Light receiving element, 8: Time differential circuit, 9: Alarm circuit, 10: Optical pulse measuring device,
P: Lateral pressure, Q: Tension.
Claims (1)
されたラインセンサーと、該光フアイバの一方端
に発光素子を備え、他方端に受光素子、時間微分
回路、警報回路を備えたシステムにおいて、前記
スペーサはその長手方向に所定のピツチで複数の
欠落部が設けられ、該各欠落部を順次通過させた
前記光フアイバが長手方向に波形状に前記スペー
サに保持されていることを特徴とする地中埋設物
異常監視システム。1. In a system comprising a line sensor in which a coating layer is applied to the outer periphery of an optical fiber and a spacer, and a light emitting element at one end of the optical fiber and a light receiving element, a time differentiator circuit, and an alarm circuit at the other end, the spacer is characterized in that a plurality of cutout parts are provided at a predetermined pitch in the longitudinal direction, and the optical fiber, which has passed through each cutout part in sequence, is held by the spacer in a wave shape in the longitudinal direction. Buried object abnormality monitoring system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15595983A JPS6049200A (en) | 1983-08-25 | 1983-08-25 | Abnormality monitoring system for underground material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15595983A JPS6049200A (en) | 1983-08-25 | 1983-08-25 | Abnormality monitoring system for underground material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6049200A JPS6049200A (en) | 1985-03-18 |
| JPH0340280B2 true JPH0340280B2 (en) | 1991-06-18 |
Family
ID=15617270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15595983A Granted JPS6049200A (en) | 1983-08-25 | 1983-08-25 | Abnormality monitoring system for underground material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6049200A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4732840B2 (en) * | 2005-09-06 | 2011-07-27 | 日立電線株式会社 | Shock detecting optical fiber sensor, stress concentrating plate and manufacturing method thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0676172A (en) * | 1991-04-16 | 1994-03-18 | Sumitomo Electric Ind Ltd | Detector for burglary |
| KR100249588B1 (en) * | 1996-01-12 | 2000-03-15 | 이마이 기요스케 | Apparatus for detecting living body signals |
| JP3536500B2 (en) * | 1996-01-12 | 2004-06-07 | 松下電工株式会社 | Biological signal detection device |
| JP3536512B2 (en) * | 1996-03-15 | 2004-06-14 | 松下電工株式会社 | Biological signal detection device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122352A (en) * | 1981-01-23 | 1982-07-30 | Fujitsu Ltd | System for detecting destruction of road |
| JPS5855731A (en) * | 1981-09-28 | 1983-04-02 | Fujitsu Ltd | Pressure sensor |
-
1983
- 1983-08-25 JP JP15595983A patent/JPS6049200A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122352A (en) * | 1981-01-23 | 1982-07-30 | Fujitsu Ltd | System for detecting destruction of road |
| JPS5855731A (en) * | 1981-09-28 | 1983-04-02 | Fujitsu Ltd | Pressure sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4732840B2 (en) * | 2005-09-06 | 2011-07-27 | 日立電線株式会社 | Shock detecting optical fiber sensor, stress concentrating plate and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6049200A (en) | 1985-03-18 |
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