JPH03288081A - Electromagnetic shielding structure for buried conduit - Google Patents
Electromagnetic shielding structure for buried conduitInfo
- Publication number
- JPH03288081A JPH03288081A JP2089037A JP8903790A JPH03288081A JP H03288081 A JPH03288081 A JP H03288081A JP 2089037 A JP2089037 A JP 2089037A JP 8903790 A JP8903790 A JP 8903790A JP H03288081 A JPH03288081 A JP H03288081A
- Authority
- JP
- Japan
- Prior art keywords
- buried
- conduit
- corrosion
- buried conduit
- electromagnetic shielding
- 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.)
- Granted
Links
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 230000007797 corrosion Effects 0.000 claims abstract description 19
- 239000004020 conductor Substances 0.000 claims abstract description 9
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- 239000011241 protective layer Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 19
- 238000010276 construction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 abstract 2
- 239000010959 steel Substances 0.000 abstract 2
- 230000002265 prevention Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052742 iron Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000005674 electromagnetic induction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Sewage (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、地中に埋設されたガス管等の埋設導管が高圧
・超高圧送電線の電磁作用により交流腐食するのを防止
するための電磁遮蔽構造に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for preventing AC corrosion of buried conduits such as gas pipes buried underground due to electromagnetic action of high-voltage and ultra-high-voltage power transmission lines. It relates to electromagnetic shielding structures.
［従来の技術］
近年、パイプライン布設工区に高圧・超高圧送電線が並
設されることが多くなり、それに伴って、電磁誘導作用
によって埋設導管に起電力が誘起され、埋設導管の交流
腐食が促進されるということや電気防食設備への悪り響
等が問題となっている。[Prior art] In recent years, high-voltage and ultra-high-voltage power transmission lines are often installed side by side in pipeline construction areas, and as a result, electromotive force is induced in the buried conduit by electromagnetic induction, resulting in AC corrosion of the buried conduit. Problems include the promotion of corrosion and the negative impact on cathodic protection equipment.
第２図は、従来の電磁遮蔽構造を説明するための概念図
である。FIG. 2 is a conceptual diagram for explaining a conventional electromagnetic shielding structure.
図において、パイプライン布設工区には、地中（地面２
６）に埋設された導管（例えば使用圧力２０〜３０ｋｇ
／ｃｍ’の都市ガス管）と並行して、高圧（超高圧〉送
電鉄塔２５が設けられ、送電線２５ａが架は渡されてい
る。近年、送電電力・送電距離の増大に伴って高電圧送
電が採用されており、数十〜数百ｋＶ程度の電圧で電力
の輸送がなされている。In the figure, the pipeline construction area is underground (ground level 2).
6) Conduit buried in (for example, working pressure 20-30 kg
A high-voltage (ultra-high-voltage) transmission tower 25 is installed in parallel with the city gas pipe (city gas pipes), and a transmission line 25a is installed across the rack.In recent years, with the increase in transmitted power and distance, high voltage Power transmission is used, and power is transported at a voltage of several tens to several hundred kV.
このような埋設導管２１と送電線２５ａが並設されてい
る場合、送電線２５ａに流れる電流の電ｆ１１１誘導作
用によって、地中の埋設導管２１に起電力が誘起される
ことになる。一般に、埋設導管２１に腐食が発生しない
電圧の限界は、５ｍＶ／■（環中の電位勾配、即ち迷走
電流の大きさ）以下とされているのに対し、電６Ｌ３導
作用によって埋設導管２１に印加される電圧は数百ｍＶ
−１，５Ｖに及ぶ。誘導電流により、送電線２５ａの並
設区間においては、埋設導管２１を外部電磁界から遮蔽
しないと、埋設導管２１の腐食が促進されることになる
。When such buried conduit 21 and power transmission line 25a are installed in parallel, an electromotive force is induced in underground conduit 21 by the electric f111 induction effect of the current flowing through power transmission line 25a. In general, the voltage limit at which corrosion does not occur in the buried conduit 21 is set to be 5 mV/■ (the potential gradient in the ring, that is, the magnitude of stray current). The applied voltage is several hundred mV
-1.5V. Due to the induced current, corrosion of the buried conduit 21 will be accelerated unless the buried conduit 21 is shielded from external electromagnetic fields in the parallel section of the power transmission line 25a.
従来、電磁誘導作用による埋設導管２１の腐食を防止す
るためには、埋設導管２１の送電鉄塔２５側に鉄板２２
ａ、２２ｂを配置して、鉄板２２ａ、２２ｂの当接部を
溶接によって接続し、電磁遮蔽するという対策が採用さ
れていた。Conventionally, in order to prevent corrosion of the buried conduit 21 due to electromagnetic induction, an iron plate 22 was installed on the power transmission tower 25 side of the buried conduit 21.
A countermeasure has been adopted in which electromagnetic shielding is achieved by arranging iron plates 22a and 22b and connecting the abutting portions of iron plates 22a and 22b by welding.
［発明が解決しようとする課題］
しかし、上記のような従来の電６１ｉＪ蔽構造において
は、鉄板の重量が大きく取り扱いが容易ではないばかり
か、鉄板と鉄板とを溶接で接続しなければならず（送電
線側に隙間があると充分な遮蔽効果が得られない）、電
磁遮蔽のために工事の負荷が著しく増大するという問題
点があった。[Problems to be Solved by the Invention] However, in the conventional electric 61iJ shielding structure as described above, not only is the iron plate heavy and difficult to handle, but the iron plates must be connected by welding. (If there is a gap on the power transmission line side, a sufficient shielding effect cannot be obtained), and the electromagnetic shielding significantly increases the work load.
また、長期間のうちには鉄板自体の腐食も進行すると考
えられ、一定の期間を経た後には遮蔽効果が低下する前
に鉄板を交換したりすることも考慮しなければならなか
った。In addition, it is thought that the iron plate itself will corrode over a long period of time, so it was necessary to consider replacing the iron plate after a certain period of time before the shielding effect deteriorates.
この発明は、かかる点に鑑みてなされたものであり、取
り扱いが容易で、パイプライン布設時に容易に施工でき
、腐食に対する対策も充分な埋設導管の電磁遮蔽構造を
提供することを目的とするものである。This invention has been made in view of the above, and aims to provide an electromagnetic shielding structure for buried conduits that is easy to handle, can be easily constructed during pipeline installation, and has sufficient measures against corrosion. It is.
［課題を解決するための手段］
本発明の電磁遮蔽構造は、埋設導管を外部電磁界から遮
蔽するための電磁遮蔽構造であり、上記の課題を達成す
るために、埋設導管の近傍に、導線の外面が耐食性の保
護層で被覆されてなるケーブルが並設されたことを特徴
とするものである。[Means for Solving the Problems] The electromagnetic shielding structure of the present invention is an electromagnetic shielding structure for shielding a buried conduit from an external electromagnetic field. The cables are arranged in parallel, the outer surfaces of which are coated with a corrosion-resistant protective layer.
本発明におけるケーブ−ルの導線は、具体的には軽量で
、電気抵抗の小さい銅、アルミニウム等で構成される。Specifically, the conductor of the cable in the present invention is made of light weight, low electrical resistance copper, aluminum, or the like.
［作用］
本発明においては、埋設導管と並行して銅やアルミニウ
ム等を導線とするケーブルが配置されるので、地上の高
圧送１を線による電磁誘導作用はこのケーブルの導線に
働き、電気抵抗の小さい導線に誘導電流が流れる。これ
により、一般に炭素鋼からなる埋設導管に生じる誘導起
電力が抑制され、埋設導管には腐食を促進するような電
圧が加わらない。[Function] In the present invention, since a cable whose conductor is made of copper, aluminum, etc. is placed in parallel with the buried conduit, the electromagnetic induction effect by the wire of the high-pressure transmission 1 on the ground acts on the conductor of this cable, reducing the electrical resistance. An induced current flows in a small conductor. As a result, the induced electromotive force generated in the buried conduit, which is generally made of carbon steel, is suppressed, and voltage that would promote corrosion is not applied to the buried conduit.
また、本発明で電磁遮蔽のために用いるケーブルは、軽
量でかつ連続性のあるものであるから、電磁誘導障害が
問題となるパイプラインの工区に合わせて、容易Ｃ長さ
を調節することができ、取り扱いが簡単で溶接の必要も
ない。Furthermore, since the cable used for electromagnetic shielding in the present invention is lightweight and continuous, the length can be easily adjusted to suit the pipeline section where electromagnetic induction interference is a problem. It is easy to handle and does not require welding.
更に、ケーブルには耐食性の保護層が設けられているの
で、パイプライン布設時に導管に並行してケーブルを埋
設した後は、導線自体の腐食によって電磁遮蔽効果が低
下することもない。Furthermore, since the cable is provided with a corrosion-resistant protective layer, the electromagnetic shielding effect will not deteriorate due to corrosion of the conductor itself after the cable is buried parallel to the conduit during pipeline installation.
［実施例］
第１図は、本発明の実施例による電Ｉｉｉ！遮蔽構造を
説明するための概念図である。[Embodiment] FIG. 1 shows a power supply system III! according to an embodiment of the present invention. FIG. 3 is a conceptual diagram for explaining a shielding structure.
図において、パイプライン布設工区の地中（地面６）に
は、導管１（外径６００ｆｆｉ閣の都市ガス管）が埋設
されており、地上にはこの導管ｌに沿って送電鉄塔５が
設けられ、高圧（超高圧）送電線が架は渡されている。In the figure, a conduit 1 (city gas pipe with an outer diameter of 600ffi) is buried underground (ground 6) in the pipeline construction area, and a power transmission tower 5 is installed above ground along this conduit 1. , high-voltage (ultra-high-voltage) power lines are strung across the bridge.
そして、埋設導管１の送電鉄塔５側の近傍には電６Ｂ遮
蔽用のケーブル２ａ、２ｂ、２ｃが埋設導管１と並行し
て埋設されている。本実施例におけるケーブル２ａ、２
ｂ、２ｃは、銅（又はアルミニウム）からなる導線２の
外周面が耐食性の高分子材料からなる保護層４で被覆さ
れたものである。その断面積は約５ｈｍ”で、埋設導管
１の外面から５０ｃｍ以内程度の位置に配置されている
。このケーブル２ａ、２ｂ、２ｃの配置本数や断面積等
は、電磁誘導作用の程度に応じて適宜選択されるもので
ある。Cables 2a, 2b, and 2c for shielding the electric power 6B are buried in the vicinity of the power transmission tower 5 side of the buried conduit 1 in parallel with the buried conduit 1. Cables 2a, 2 in this embodiment
In b and 2c, the outer peripheral surface of a conductive wire 2 made of copper (or aluminum) is coated with a protective layer 4 made of a corrosion-resistant polymeric material. Its cross-sectional area is approximately 5 hm'', and it is placed within 50 cm from the outer surface of the buried conduit 1.The number and cross-sectional area of these cables 2a, 2b, 2c are determined depending on the degree of electromagnetic induction. It is selected as appropriate.
このような構造においては、送電線に流れる電流による
電１１ｆ１誘導作用は、埋設導管１と並行して配置され
たケーブル２ａ、２ｂ、２ｃによって遮蔽され、埋設導
管１には腐食を促進するような電圧が加わらない。送電
線の誘起する電磁界の大きさが大きい場合でも、ケーブ
ルの配置本数を増すことによって、容易に対応すること
が可能である。In such a structure, the electric current 11f1 induced by the current flowing through the power transmission line is shielded by the cables 2a, 2b, and 2c arranged in parallel with the buried conduit 1, and the buried conduit 1 contains No voltage is applied. Even if the electromagnetic field induced by the power transmission line is large, it can be easily dealt with by increasing the number of cables arranged.
［発明の効果］
以上のように、本発明においては、埋設導管の近傍に軽
量で電気抵抗の小さい導線の外周面が耐食性の保護層で
被覆されたケーブルを並設することによって、送電線に
流れる電流が誘起する電磁界から埋設導管を遮蔽してい
るので、電磁作用による埋設導管の交流腐食の進行を半
永久的に防止することができる。また、本発明で電６ｉ
１遮蔽のために用いるケーブルは、従来の遮蔽鉄板に比
べて軽量で取り扱いやすく、かつ溶接の必要もないので
、電磁遮蔽のための工事を効率良く安価に行なうことが
できる。[Effects of the Invention] As described above, in the present invention, by arranging a cable in which the outer circumferential surface of a lightweight conductive wire with low electrical resistance is coated with a corrosion-resistant protective layer in the vicinity of a buried conduit, power transmission lines can be Since the buried conduit is shielded from the electromagnetic field induced by the flowing current, it is possible to semi-permanently prevent the progression of AC corrosion of the buried conduit due to electromagnetic action. In addition, the present invention also provides electric 6i
1. The cable used for shielding is lighter and easier to handle than conventional shielding iron plates, and there is no need for welding, so electromagnetic shielding work can be carried out efficiently and at low cost.
第１図は本発明実施例による電磁遮蔽構造を説明するた
めの概念図、第２図は従来の電磁遮蔽構造を説明するた
めの概念図である。
［主要部分の符号の説明］
１・・・・・・・・・・・・・・・・・・・・・・・・
埋設導管２ａ、２ｂ、２ｃ・＝ケーブルFIG. 1 is a conceptual diagram for explaining an electromagnetic shielding structure according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram for explaining a conventional electromagnetic shielding structure. [Explanation of symbols of main parts] 1・・・・・・・・・・・・・・・・・・・・・・・・
Buried conduit 2a, 2b, 2c = cable
Claims (2)
蔽構造であって、前記埋設導管の近傍に、導線の外面が
耐食性の保護層で被覆されてなるケーブルが並設された
ことを特徴とする埋設導管の電磁遮蔽構造。(1) An electromagnetic shielding structure for shielding a buried conduit from an external electromagnetic field, characterized in that a cable made of a conductor whose outer surface is coated with a corrosion-resistant protective layer is installed in the vicinity of the buried conduit. Electromagnetic shielding structure for buried conduits.
なることを特徴とする請求項１記載の埋設導管の電磁遮
蔽構造。(2) The electromagnetic shielding structure for a buried conduit according to claim 1, wherein the conductor of the cable is made of copper or aluminum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2089037A JP3060482B2 (en) | 1990-04-05 | 1990-04-05 | Electromagnetic shielding structure of buried conduit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2089037A JP3060482B2 (en) | 1990-04-05 | 1990-04-05 | Electromagnetic shielding structure of buried conduit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03288081A true JPH03288081A (en) | 1991-12-18 |
| JP3060482B2 JP3060482B2 (en) | 2000-07-10 |
Family
ID=13959696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2089037A Expired - Fee Related JP3060482B2 (en) | 1990-04-05 | 1990-04-05 | Electromagnetic shielding structure of buried conduit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3060482B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010261506A (en) * | 2009-05-07 | 2010-11-18 | Hitoshi Kijima | Buried pipe shielding structure and buried pipe shielding method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2003271923A1 (en) | 2002-10-17 | 2004-05-04 | Vodafone Group Plc. | Facilitating and authenticating transactions |
-
1990
- 1990-04-05 JP JP2089037A patent/JP3060482B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010261506A (en) * | 2009-05-07 | 2010-11-18 | Hitoshi Kijima | Buried pipe shielding structure and buried pipe shielding method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3060482B2 (en) | 2000-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |