JPS60152945A - Judgement of corrosive deterioration of aluminium coated steel twisted wire - Google Patents
Judgement of corrosive deterioration of aluminium coated steel twisted wireInfo
- Publication number
- JPS60152945A JPS60152945A JP847484A JP847484A JPS60152945A JP S60152945 A JPS60152945 A JP S60152945A JP 847484 A JP847484 A JP 847484A JP 847484 A JP847484 A JP 847484A JP S60152945 A JPS60152945 A JP S60152945A
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- aluminum
- coated steel
- terminals
- twisted wire
- 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.)
- Pending
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Ecology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Environmental Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明はアルミ被覆鋼よシ線の腐食劣化判定方法に関し
、アルミ被覆鋼より線の防食アルミ層の腐食程度を簡便
かつ精密に測定し得るように工夫したものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for determining corrosion deterioration of aluminum-coated steel strands, and is capable of easily and precisely measuring the degree of corrosion of the anticorrosive aluminum layer of aluminum-coated steel strands. It was devised in such a way.
〈従来技術〉
通信用架空ケーブルのつシ線や電柱の支線には鋼よυ線
が用いられるが、海岸沿い、工場地帯、温泉地などの腐
食地帯ではアルミ被覆鋼線４本と硬アルミ線１本あるい
はアルミ被覆鋼線のみ７本をより合わせたアルミ被覆鋼
より線が使用されている。ところが海岸地帯において、
つシ線につるした接続端子がんのノズル部でつυ線の腐
食断線が生じ問題となっている。<Prior art> Steel wires are used for the wires of overhead communication cables and the branch lines of utility poles, but in corrosive areas such as along the coast, in industrial areas, and in hot spring areas, four aluminum-coated steel wires and hard aluminum wires are used. Aluminum coated steel stranded wires, which are made by twisting one or only seven aluminum coated steel wires, are used. However, in the coastal area,
Corrosion and disconnection of the υ wire at the nozzle part of the connection terminal gun that is suspended from the tsuri wire has caused a problem.
第１図は接続端子かんノズル部の断面図であって、■は
アルミ被覆鋼より線、２はケーブル、３は７−リングテ
ープである。調査によると腐食は先ずシーリングテープ
３の下で部分的に発生し、次にシーリングテープ３の下
全面にひろがシアルミが消失してゆく。さらに腐食が進
むと部分的に銅芯が露出し、次には露出面積がひろがる
とともに銅芯が腐食により細径化して強度低下が起こる
。銅芯の断面積が半分以下に低下すると断線のおそれが
生ずる。FIG. 1 is a cross-sectional view of the nozzle portion of the connecting terminal, in which ``■'' is an aluminum-coated steel stranded wire, 2 is a cable, and 3 is a 7-ring tape. According to the investigation, corrosion first occurs partially under the sealing tape 3, and then the aluminum disappears all over the entire surface under the sealing tape 3. As the corrosion progresses further, the copper core becomes partially exposed, and as the exposed area expands, the diameter of the copper core decreases due to corrosion, resulting in a decrease in strength. If the cross-sectional area of the copper core is reduced to less than half, there is a risk of wire breakage.
このように腐食は隠蔽部で発生するため発見が困難であ
シ、従来、点検のためにはノズル部を解体してシーリン
グテープ３を剥ぎ目視観察を行わなければならなかった
。また定量的な評価を行う場合膜厚計、ノギス等によシ
残存アルミニウム厚を測定する方法が考えられるが、こ
の測定は柱上で行なわなければならないので作業性が悪
い。また複雑な腐食形状については評価が困難である。Corrosion occurs in hidden parts and is therefore difficult to detect. Conventionally, for inspection, it was necessary to disassemble the nozzle part, peel off the sealing tape 3, and perform visual observation. In addition, in the case of quantitative evaluation, it is possible to measure the remaining aluminum thickness using a film thickness meter, a caliper, etc., but this measurement has to be carried out on a column and is therefore inefficient. Furthermore, it is difficult to evaluate complex corrosion shapes.
いずれの方法でも目視点検の場合と同様ツーリングテー
プを取除かなければならず、作業コスト、物品コストの
うえで不利である。In either method, the tooling tape must be removed as in the case of visual inspection, which is disadvantageous in terms of work costs and product costs.
〈発明の目的〉
本発明は、上記従来技術に鑑みアルミ被覆鋼よシ線防食
アルミ層の腐食程度を簡便かつ精密に判定することを目
的とする。<Objective of the Invention> In view of the above-mentioned prior art, an object of the present invention is to easily and accurately determine the degree of corrosion of a wrinkle-proof aluminum layer of aluminum-coated steel.
〈発明の構成〉
上記目的を達成する本発明はアルミ被覆鋼より線の長さ
方向の電気抵抗を測定して判定する点をその技術思想の
基礎とするものである。<Structure of the Invention> The present invention, which achieves the above object, is based on the technical concept of measuring and determining the electrical resistance of an aluminum-coated steel wire in the longitudinal direction.
〈発明の蛎１子１〉
通信用架空ケーブルのつシ線に用いられるアルミ被覆鋼
より線のうちで最も多量に使用されるのは３０ｍｍ’ア
ルミ防食鋼よシ線である。この鋼よシ線は０．５７％Ｃ
硬銅線に断面積比２５％のアルミニウムを被覆して外径
φ３．１としたアルミ被覆＠線４本をφ１．３の硬アル
ミ線を中心としてよシ合わせたもので電気抵抗を計算す
ると以下のようになる。<Egg 1 of the Invention 1> Among the aluminum coated steel stranded wires used for the wires of overhead communication cables, the most widely used is 30 mm' aluminum anticorrosive steel wires. The wire of this steel is 0.57%C
Calculating the electrical resistance using 4 aluminum-coated wires with an outer diameter of φ3.1 made by coating hard copper wire with aluminum with a cross-sectional area ratio of 25% and waving them together around a hard aluminum wire of φ1.3. It will look like this:
０電気抵抗率 鋼 １７．５μΩ備、アルミニウム２．
７μΩ備
０断 面 積 銅芯 ２２．６４− アルミニウム８．
８８ｍｍ’
ｏｌｍあたりの電気抵抗 銅芯 ７−７−７３Ｏアルミ
ニウム３．０４１ｍρ
０１ｍあたりの合成抵抗 ３０ｍｍ”アルミ防食鋼より
線２−１８２ｍΩ３０ｍｒｒ？ アルミ防食鋼よシ線の
アルミニウムが１ｍの長さにわたって均一に腐食消失し
てゆくときの電気抵抗をアルミニウム部と調芯部の並列
抵抗として計算すると表１のようになる。0 electrical resistivity steel 17.5 μΩ, aluminum 2.
7μΩ cross section copper core 22.64-aluminum 8.
Electrical resistance per 88mm'olm Copper core 7-7-73O aluminum 3.041mρ Combined resistance per 01m 30mm" Aluminum anticorrosion steel stranded wire 2-182mΩ30mrr? Aluminum anticorrosion steel wire stranded aluminum uniformly over a length of 1m The electrical resistance when corrosion disappears is calculated as the parallel resistance of the aluminum part and the alignment part, as shown in Table 1.
先に述べたようにアルミ被覆鋼より線の腐食は接続端子
かんノズル部の７−リングテープ３の下で起こるが、ノ
ズルの構造と寸法上電圧測定の間隔は２００謡程度とす
る必要がある。アルミニウムの腐食が幅４０鵡のシーリ
ングチーブ３の下でのみ均一に進行するとし測定間隔２
００鶴として電気抵抗を腐食部と非腐食部の直列抵抗と
して計算すると表２のようになる。As mentioned earlier, corrosion of the aluminum coated steel stranded wire occurs under the 7-ring tape 3 at the connection terminal nozzle part, but due to the structure and dimensions of the nozzle, the interval between voltage measurements needs to be about 200 meters. . Assuming that aluminum corrosion progresses uniformly only under the sealing tube 3 with a width of 40mm, the measurement interval is 2.
If the electrical resistance is calculated as the series resistance of the corroded part and the non-corroded part, it will be as shown in Table 2.
表１はアルミニウム部が長範囲にわたって一様に腐食し
たと仮定し１表２はアルミニウムの腐食部が短い範囲に
集中し、かつその範囲内では一様に腐食し甘・ヒ仮定し
た計算結果である。Table 1 shows the calculation results assuming that the aluminum part is corroded uniformly over a long range, and Table 2 shows the calculation results assuming that the aluminum part is concentrated in a short range and corrodes uniformly within that range. be.
第２図は本発明の実施例方法を実現した場合の態様を示
す正面図である。同図中、■はアルミ被覆鋼より線、４
は接続端子がん、５，５ａはノズル部、６，６ａは電流
導入端子、７，８゜９．１０は電圧測定端子、１１は定
電流電源、１２．１３は電圧計である。ここで７と８．
９と１０の間隔を等しくし、７−８間の電圧をＶｏ。FIG. 2 is a front view showing an embodiment of the method according to the present invention. In the same figure, ■ is aluminum-coated steel stranded wire, 4
5 and 5a are connection terminals, 5 and 5a are nozzle parts, 6 and 6a are current introduction terminals, 7 and 8 degrees 9.10 are voltage measurement terminals, 11 is a constant current power supply, and 12.13 is a voltmeter. Here 7 and 8.
The intervals between 9 and 10 are made equal, and the voltage between 7 and 8 is Vo.
９−１０間の電圧をＶ２．７−８間の抵抗をＲ□。The voltage between 9-10 is V2. The resistance between 7-8 is R□.
９−１０間の抵抗をＲ２とする。６−６ａ間に定電流を
流すとＶ、 、 Ｖ２はＲ□、Ｒ２に比例した電圧とな
るので、７−８間、９’−１０間どちらも腐食による断
面積減少がなくＲ□とＲ２が等しい場合ｖ１と■２ は
等しくなる。ノズル部５で腐食が起こυ防食アルミ層の
一部が失われるとＲ１に比べＲ２が大きくなり■２／′
ｖ□が１より犬となることで腐食劣化を検出できる。表
３は本実施例１に基づき実際架渉されている３０ｍｍ”
アルミ防食鋼よりｉについて測定した結果をまとめた
ものである。測定は７−８．９−１０の間隔をそれぞれ
２１５１Ｂ、定電流を直流ＩＡとして行った。Let the resistance between 9 and 10 be R2. When a constant current is passed between 6-6a, V, , V2 becomes a voltage proportional to R□, R2, so there is no reduction in cross-sectional area due to corrosion between 7-8 and 9'-10, and R□ and R2 If they are equal, v1 and ■2 are equal. When corrosion occurs in the nozzle part 5 and part of the anti-corrosion aluminum layer is lost, R2 becomes larger than R1 ■2/'
Corrosion deterioration can be detected when v□ is greater than 1. Table 3 shows the actual span of 30 mm based on Example 1.
This is a summary of the results of measuring i from aluminum anticorrosive steel. The measurements were carried out at intervals of 7-8, 9-10, 2151B, and a constant current of DC IA.
表３に示した腐食程度はツーリングテープ３をはずし、
鋼よシ線の表面を目視した結果である。目視による定性
的な判定であるが、４段階の腐食程反に応じて腐食部と
非腐食部の電気抵抗比は群をなしている。実際に架渉さ
れている鋼より線の表面腐食は、架渉の環境によっても
異な９、また幅４０Ｍのシーリングテープ３の下部表面
が一様に腐食するのではないが、表３の結果と表２とを
対照すると、表３における「銅芯に達する腐食」の平均
抵抗比１．２２２は表２のアルミニウム腐食断面積比７
５％程度に相当し、［ツーリングテープ３全面にわたる
腐食」の平均抵抗値１．０６４はアルミニウム腐食断面
積比３３％程度に相当する。すなわち実際の架渉環境下
で不均一に進行するアルミニウム部の腐食は、シーリン
グテープ３下面に集中し、かつその範囲で均一に進む腐
食にかなシ近く、かつ部分的に均一腐食よシ腐食が進行
していることを表３の結果は示している。表３の結果は
電気抵抗測定により、アルミニウム部の腐食の状況を実
用上十分な程度に、すなわちｉ度上問題となる調芯露出
の段階を検出しうろことを示すものである。To check the degree of corrosion shown in Table 3, remove the tooling tape 3,
This is the result of visually observing the surface of the steel wire. Although it is a qualitative judgment by visual observation, the electrical resistance ratio of the corroded part and the non-corroded part forms groups according to the four stages of corrosion. The surface corrosion of the steel strands actually spanned varies depending on the environment of the span9, and the lower surface of the 40M wide sealing tape 3 does not corrode uniformly, but the results in Table 3 and In comparison with Table 2, the average resistance ratio of "corrosion reaching the copper core" in Table 3 is 1.222, while the aluminum corrosion cross-sectional area ratio in Table 2 is 7.
The average resistance value of [corrosion over the entire surface of tooling tape 3] of 1.064 corresponds to an aluminum corrosion cross-sectional area ratio of about 33%. In other words, the corrosion of the aluminum part, which progresses unevenly in the actual construction environment, is concentrated on the lower surface of the sealing tape 3, and the corrosion progresses uniformly in that area. The results in Table 3 show that progress is being made. The results in Table 3 show that electrical resistance measurements can be used to detect corrosion of aluminum parts to a practically sufficient degree, that is, to detect the stage of alignment exposure which is a serious problem.
〈発明の効果〉
以上説明したようにアルミ被覆鋼より線の緊線は外層が
導電率の高いアルミニウム、内層が導電率が低い鋼とい
う構成となっていることから、腐食によシ外層のアルミ
ニウムの一部が失われていく場合電気抵抗の増加が大き
いため、たとえ腐食の程度が小さくても電気抵抗測定に
よシ検出が容易である。また電気抵抗の測定は簡便でか
つ精度がよく、しかも装置が簡単であることから現場で
の腐食劣化判定に非常に適した方法である。<Effects of the Invention> As explained above, since the aluminum-coated steel wire has a structure in which the outer layer is made of high-conductivity aluminum and the inner layer is made of low-conductivity steel, the aluminum in the outer layer does not corrode. If a portion of the corrosion is lost, the increase in electrical resistance is large, so even if the degree of corrosion is small, it is easy to detect it by measuring electrical resistance. Furthermore, the measurement of electrical resistance is simple and accurate, and the equipment is simple, making it an extremely suitable method for on-site evaluation of corrosion deterioration.
第１図は接続端子かんノズル部の断面図、第２図は本発
明方法の実施僧奄実現した場合の態様を示す正面図であ
る。
図面中、
■はアルミ被覆鋼より線、
２はケーブル１、−
３はシーリングγ・−プ、
４は接続端子がん、−一
５．５ａはノズル部、−
６，６ａは電流溝へ端子、
７．８，９．１０は電圧測定端子、
１１は定電流電源、
１２．１３は電圧計である。
特許出願人
日本電信電話公社
代理人
弁理士 元 石 士 部（他１名）
第１図
第２図FIG. 1 is a sectional view of a connecting terminal nozzle portion, and FIG. 2 is a front view showing an embodiment of the method of the present invention. In the drawing, ■ is the aluminum-coated steel stranded wire, 2 is the cable 1, -3 is the sealing gamma--p, 4 is the connecting terminal gun, -15.5a is the nozzle part, -6 and 6a are the terminals to the current groove , 7.8, 9.10 are voltage measurement terminals, 11 is a constant current power supply, and 12.13 is a voltmeter. Patent applicant Nippon Telegraph and Telephone Public Corporation Patent attorney Moto Ishibe Shibu (and 1 other person) Figure 1 Figure 2
Claims (1)
続端子がんのノズル部の長さ７５向に亘る両端間と、こ
の近傍のアルミ被覆鋼よシ線の長さ方向の両端間との電
気抵抗を測定して比較することによりアルミ被覆鋼より
線の防食アルミ層の腐食程度を判定することを特徴とす
るアルミ被覆鋼よシ線の腐食劣化判定方法。Between both ends in the 75 length direction of the nozzle part of the connecting terminal gun of the aluminum-coated steel stranded wire, which is made by twisting aluminum-coated steel wires, and between both ends in the length direction of the aluminum-coated steel wire in the vicinity A method for determining corrosion deterioration of an aluminum-coated steel stranded wire, characterized by determining the degree of corrosion of a corrosion-protective aluminum layer of the aluminum-coated steel stranded wire by measuring and comparing electrical resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP847484A JPS60152945A (en) | 1984-01-23 | 1984-01-23 | Judgement of corrosive deterioration of aluminium coated steel twisted wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP847484A JPS60152945A (en) | 1984-01-23 | 1984-01-23 | Judgement of corrosive deterioration of aluminium coated steel twisted wire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60152945A true JPS60152945A (en) | 1985-08-12 |
Family
ID=11694106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP847484A Pending JPS60152945A (en) | 1984-01-23 | 1984-01-23 | Judgement of corrosive deterioration of aluminium coated steel twisted wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60152945A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016142613A (en) * | 2015-02-02 | 2016-08-08 | 東日本電信電話株式会社 | Detection device for cross-sectional area change |
-
1984
- 1984-01-23 JP JP847484A patent/JPS60152945A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016142613A (en) * | 2015-02-02 | 2016-08-08 | 東日本電信電話株式会社 | Detection device for cross-sectional area change |
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