JPH03102713A - Self-deforming heat stretch absorbing power cable - Google Patents
Self-deforming heat stretch absorbing power cableInfo
- Publication number
- JPH03102713A JPH03102713A JP23951989A JP23951989A JPH03102713A JP H03102713 A JPH03102713 A JP H03102713A JP 23951989 A JP23951989 A JP 23951989A JP 23951989 A JP23951989 A JP 23951989A JP H03102713 A JPH03102713 A JP H03102713A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- shape
- snake
- snake shape
- power cable
- 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
Links
- 241000270295 Serpentes Species 0.000 claims abstract description 40
- 230000008602 contraction Effects 0.000 claims abstract description 21
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 12
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 230000008646 thermal stress Effects 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 5
- 239000004020 conductor Substances 0.000 abstract description 4
- 239000012212 insulator Substances 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003446 memory effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000925 Cd alloy Inorganic materials 0.000 description 1
- 241000282342 Martes americana Species 0.000 description 1
- 229910004337 Ti-Ni Inorganic materials 0.000 description 1
- 229910011209 Ti—Ni Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、通電により軸方向の伸縮を生ずる電気ケーブ
ルに関しており、より具体的には当該軸方向の伸縮を自
己のスネーク変形により吸収する電力ケーブルに関する
．
〔従来の技術〕
一般に、電気ケーブル特に電力ケーブルは、管路内等の
制限された空間内に布設されており、通電時に生ずる軸
方向の熱伸縮を当該制限された空間内で吸収しなければ
ならない．
従来、管路内に引き込み布設される電力ケーブルにおい
て、自己の熱伸縮を吸収する施策としては、管路口から
伸び出すケーブル部分を連接円弧の曲線形状に形成して
得られているオフセット部の曲げ半径の変化を利用する
か、或いは管路内に布設されているケーブル自身に与え
たスネーク形状の変化を利用する方法があった．
ところで近年では、管路の新設が難しく既設の空き管路
を利用してケーブルを布設することの必要性が高まって
いるが、そのような既設管路では人孔に余裕が無く、管
路内のケーブルの管路口からの伸び出しを吸収できる程
度に大きな曲げ半径のオフセント寸法を得るのが困難と
なる傾向にあった．このことから、管路口部でケーブル
の移動抑止を図って、管路内のケーブルにスネーク形状
を与えて該スネーク形状の変化によりケーブルの熱伸縮
を吸収することとし、かかるオフセント部は寸法を人孔
内，のスペースに併せて小さくし且つこれの熱伸縮によ
る変形を抑制するか、或いはオフセント部を省略（ノン
オフセント）化する検討が行われている．
しかして、管路内に布設される電力ケーブルにスネーク
形状を付与するに際して、予めスネーク形状を付与した
ケーブルを管路内に引き込むことは多くの困難を伴うの
で、直線状態にしたケーブルを管路内に引き込み、前後
の管路口部でクリート等の把持手段によるケーブルの移
動抑止を図り、そして実際の活線使用時において、通電
による軸方向の伸び出しを当該移動抑止部分で受け止め
させて、管路内のケーブル自身に当該伸び出しに相応す
る軸方向の圧縮荷重をかけ、そのときの熱応力でケーブ
ルに強制的に曲げ変形を与えることが考えられている。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electric cable that expands and contracts in the axial direction when energized, and more specifically relates to an electric cable that absorbs the expansion and contraction in the axial direction by its own snake deformation. Regarding cables. [Prior Art] Generally, electric cables, especially power cables, are installed in a restricted space such as inside a conduit, and the thermal expansion and contraction in the axial direction that occurs when electricity is applied must be absorbed within the restricted space. No. Conventionally, as a measure to absorb the thermal expansion and contraction of power cables that are drawn into a conduit and laid, the cable portion extending from the conduit entrance is formed into a curved shape of a connecting arc, and the offset portion is bent. There were methods that used changes in the radius or changes in the snake shape of the cable itself installed in the conduit. Incidentally, in recent years, it has become difficult to construct new pipelines, and there has been an increasing need to use existing empty pipelines to lay cables. It has tended to be difficult to obtain an offset dimension with a bending radius large enough to absorb the extension of the cable from the conduit entrance. For this reason, we decided to prevent the cable from moving at the conduit entrance, give the cable in the conduit a snake shape, and absorb the thermal expansion and contraction of the cable by changing the snake shape. Studies are underway to reduce the size of the hole to fit the space inside the hole and suppress its deformation due to thermal expansion and contraction, or to omit the off-cent part (non-off-cent). However, when giving a snake shape to a power cable installed in a conduit, it is difficult to draw the cable that has been given a snake shape into the conduit, so it is difficult to draw the cable into the conduit in a straight state. The movement of the cable is prevented using gripping means such as cleats at the front and rear pipe openings, and when the cable is actually used, the extension in the axial direction due to energization is stopped by the movement prevention part. It has been considered to apply a compressive load in the axial direction corresponding to the elongation to the cable itself in the path, and to forcibly bend the cable by applying thermal stress at that time.
しかし、電力ケーブルでは、曲げ剛性（Ｅｌ）がかなり
大きくて、ケーブルの伸び出しに基づく熱応力のみによ
って目的のスネーク形状に変形させるには、管路口部で
の移動抑止手段に対して、ケーブルの伸び出しに伴う強
大な剪断力に耐えられるように相当に頑丈なものを用い
る必要があるとともに、それによりケーブルを強固に把
持することが必要となる．このように移動抑止手段を頑
丈なものにすれば、これを据え付ける周辺造営部の強化
も必要となって建設費用が徒に嵩み、またケーブルを強
固に把持することによって、ケーブルに電気的且つ機械
的障害を与える恐れがある。However, power cables have a fairly large bending stiffness (El), and in order to deform them into the desired snake shape only by thermal stress caused by the extension of the cable, it is difficult to It is necessary to use a material that is quite strong so that it can withstand the enormous shearing force that occurs when it begins to stretch, and it is also necessary to grip the cable firmly. If the movement restraint means were to be made sturdy in this way, it would be necessary to strengthen the surrounding construction where it would be installed, which would unnecessarily increase the construction cost. May cause mechanical damage.
のみならず、ケーブルが管路内で自由に動いて変形して
行くのセ、長さ方向に一定のピッチと振幅で正弦波形状
に変形することの補償が無く、一部分で大きく変形して
座屈破壊を生じさせる懸念がある等、そのままでは実用
上に問題があった．従来、管路内布設電力ケーブルに対
して、綿状体を螺旋状に巻き付け、該線状体の巻き付け
方向に沿ってスネーク状に変形させる手段があることは
知られていた．
〔発明が解決しようとする課題〕
しかしながら、上記のような線状体の巻き付けによるも
のにおいて、線状体の単なる巻き付けのみでは、直線状
態のケーブルを目的のスネーク形状へ容易に変化させる
ことは難しいため、線状体の端部に重錘を取り付けて線
状体に張力を付加するものく特公昭３９−２０９７２号
〉や、線状体自身に長さ方向に太い部分と細い部分とを
交互に有せしめるものく特公昭５７−２７６４１号〉等
の追加措置を必要としていた。Not only that, but the cable moves freely in the conduit and deforms, and there is no compensation for the fact that it deforms into a sinusoidal shape with a constant pitch and amplitude in the length direction, and it deforms greatly in one part and sits. There were practical problems if left as is, such as the risk of bending and fracture. Conventionally, it has been known that there is a method of spirally wrapping a cotton-like body around a power cable installed in a conduit and deforming the filament-like body into a snake shape along the winding direction. [Problem to be Solved by the Invention] However, in the above-mentioned method of winding a linear body, it is difficult to easily change a straight cable into the desired snake shape by simply winding the linear body. Therefore, a weight is attached to the end of the linear body to apply tension to the linear body (Special Publication No. 39-20972), and the linear body itself has thick and thin parts alternately in the length direction. It was necessary to take additional measures such as Special Publication No. 57-27641.
かかる重錘は管路内に設けるわけには行かないので、人
孔内に配置することとなって、スペースのない人孔を余
計に狭くしてしまうという新たな問題を惹起し、また、
後者のような特殊な線状体は製作が難しく、而も太い部
分の存在によってケーブルの管路内への引き込みが困難
化するとともにケーブルのラジアル方向の移動範囲を狭
めてしまうので、スネーク振幅が小さくなってケーブル
の屈曲変形できる範囲が自ずと制限される結果を招いて
いる。このような場合、スネーク形状の変位による熱伸
縮吸収を十分に行えなくなり、オフセット部を省略した
い要求に応えられなくなる可能性があった．
本発明は、上記した従来技術の問題点に鑑み、ケーブル
のスネーク形状の変形を大幅に制限してしまうような追
加措置を講ずることなしに、ケーブルの伸び出しによる
熱応力によって所定のスネーク形状が容易に得られるこ
の種ケーブルを提供することに目的がある．
〔課題を解決するための手段〕
本発明は、電力ケーブルに対して形状記憶合金を応用す
ることを基本構想としている。Since such a weight cannot be installed inside the pipe, it has to be placed inside the manhole, which causes a new problem of making the manhole unnecessarily narrow due to lack of space.
Special linear bodies like the latter are difficult to manufacture, and the presence of thick parts makes it difficult to pull the cable into the conduit and narrows the range of movement of the cable in the radial direction, which reduces the snake amplitude. As a result, the range in which the cable can be bent and deformed is naturally limited. In such a case, the thermal expansion and contraction caused by the displacement of the snake shape could not be sufficiently absorbed, and there was a possibility that the request for omitting the offset part could not be met. In view of the above-mentioned problems of the prior art, the present invention provides a method for deforming a predetermined snake shape by thermal stress caused by elongation of the cable without taking any additional measures that would significantly limit the deformation of the snake shape of the cable. The purpose is to provide this type of cable that is easily obtained. [Means for Solving the Problems] The basic concept of the present invention is to apply a shape memory alloy to a power cable.
形状記憶合金は、Ｔ ｉ −Ｎ ｉ合金、Ａｕ−Ｃｄ合
金或いはＣｕ−Ｚｎ−ＡＩ合金を始めとして種々の合金
組成により得られているが、これらに共通していえるこ
とは、熱弾性形マルテンサイト変態をすること、相変態
の高温域（母相）では規則格子となることの性質を有し
ており、マルテンサイト変態の逆変態つまり、低温側の
マルテンサイト相を加熱して高温側の相（母相）に戻す
場合に形状記憶効果を発する．
また、合金組威比を変えることによって変態温度を種々
の値に設定することができる。Shape memory alloys are obtained with various alloy compositions, including Ti-Ni alloy, Au-Cd alloy, and Cu-Zn-AI alloy, but what they have in common is that they are made of thermoelastic marten. It has the property of undergoing site transformation and becoming an ordered lattice in the high temperature region (mother phase) of phase transformation, and the reverse transformation of martensitic transformation, that is, heating the martensitic phase on the low temperature side and forming the high temperature side. When returning to the phase (mother phase), a shape memory effect is produced. Further, by changing the alloy composition ratio, the transformation temperature can be set to various values.
従って、かかる変態温度を通電により伸び出しが発生す
る時点でのケーブル温度と近似した値に設定することに
より、ケーブルの伸び出しとともに自己に与えられた記
憶形状に戻ることとなる。Therefore, by setting the transformation temperature to a value similar to the temperature of the cable at the time when elongation occurs due to energization, the cable returns to its memorized shape as it begins to elongate.
本発明は、このような形状記憶効果を有する金属をケー
ブルの構戒要素自身に或いはケーブルに対して付加する
がケーブルのスネーク形状の変形を大きく制約すること
がない部材に応用するものであり、その具体的な手段と
して、次の二通りを提供する．
即ち、上記目的を達戒するためになされた本発明の一つ
の手段は、形状記憧合金により形成され且つスネーク形
状を記憶させた縦長部材が長さ方向に配されているもの
としてある．
また、同一の目的を達或するためになされた本発明のも
う一つの手段は、形状記憶合金により形成され且つ直線
形状を記憶させた縦長部材が長さ方向に螺旋状に配され
ているものとしてある．縦長部材は、ケーブルの金属シ
ースを対象とすることが可能であり、特にそのものは前
記第一の手段において好適である．
また、縦長部材は、ケーブルの内部または外周に配し得
る線状体または帯状体であってもよい．〔作用〕
上記第一の手段によれば、縦長部材を含めて直線状態に
矯正したケーブルを管路内に引き込み、管路口でケーブ
ルの移動抑止を図った状態で、通電を開始することによ
り、ケーブルに発生するジュール熱でケーブル自身に軸
方向の伸び出しが発生し、かかる移動抑止によってケー
ブル自身に熱応力を受けるとともに、形状記憶合金によ
る縦長部材が加熱されて、高温側の相（母相）において
記憶しておいたスネーク形状に戻ろうとして、ケーブル
全体にスネーク形状を生起させる切っ掛けが与えられ、
もって目的のスネーク形状がかかる熱応力に基づいて確
実に而もたやすく得ることができる．
？た、上記第二の手段によれば、縦長部材を螺旋状に配
したケーブルを直線状態にして管路内に引き込み、管路
口でケーブルの移動抑止を図った状態で、通電を開始す
ることにより、ケーブルに発生するジュール熱でケーブ
ル自身に軸方向の伸び出しが発生し、かかる移動抑止に
よってケーブル自身に熱応力を受けるとともに、形状記
憶合金による縦長部材が加熱されて、高温側の相（母相
）において記憶しておいた直線形状に戻ろうとしてケー
ブル自身に側圧を与え、これがケーブル全体にスネーク
形状を生起させる切っ掛けを与え、もって目的のスネー
ク形状がかかる熱応力に基づいて確実に而もたやすく得
るこ■とができる．〔実施例〕
第１図は、本発明にかかる自己変形熱伸縮吸収電力ケー
ブルの第一実施例を示しており、導体ｌ及びＰ．縁体２
を主要素とするケーブルコア３上に形状記憶合金により
形成され且つ高温側の相（母相）において正弦波形状の
スネーク形状を記憶させた金属シース４が施され、外被
としての防食層５が施されたものである．
第２ＶＡ（イ）及び（口）は、本発明にかかる自己変形
熱伸縮吸収電力ケーブルの第二実施例を示しており、導
体ｌ及び絶縁体２を主要素とするケーブルコア３上に金
属シース４′、防食層５が順次施された電力ケーブル本
体６に対して、形状記憶合金により形成され且つ高温側
の相（母相）において直線形状を記憶させた線状体７を
用いて、これを当該防食層５の外周でケーブル軸方向に
螺旋状に巻き付けてなるものである。The present invention applies a metal having such a shape memory effect to a member that does not significantly restrict the deformation of the snake shape of the cable, although it is added to the structural element of the cable itself or to the cable. The following two methods are provided as specific methods for this purpose. That is, one of the means of the present invention to achieve the above object is that vertically long members made of a shape-memory alloy and memorized in a snake shape are arranged in the length direction. Another means of the present invention to achieve the same object is that vertically long members made of a shape memory alloy and having a linear shape memorized are arranged in a spiral shape in the length direction. It is as follows. The longitudinal member can be directed to the metal sheath of the cable, which is particularly suitable in the first means. Further, the longitudinal member may be a linear body or a band-shaped body that can be disposed inside or on the outer periphery of the cable. [Operation] According to the first means, the cable straightened into a straight state including the longitudinal member is drawn into the conduit, and energization is started while the cable is prevented from moving at the conduit entrance. The Joule heat generated in the cable causes the cable itself to stretch in the axial direction, and as a result of this restraint of movement, the cable itself receives thermal stress, and the longitudinal member made of the shape memory alloy is heated, causing the high-temperature side phase (mother phase ), in an attempt to return to the memorized snake shape, a trigger is given that causes the entire cable to take on a snake shape.
This ensures that the desired snake shape can be easily obtained based on the applied thermal stress. ? Furthermore, according to the second means, a cable having longitudinally arranged helical members is drawn into the conduit in a straight line, and energization is started while the cable is prevented from moving at the conduit entrance. , the Joule heat generated in the cable causes the cable itself to stretch in the axial direction, and as a result of this restraint of movement, the cable itself receives thermal stress, and the vertical member made of the shape memory alloy is heated, causing the high-temperature side phase (mother) to elongate. lateral pressure is exerted on the cable itself in an attempt to return to the memorized straight shape at the phase), which triggers the entire cable to develop a snake shape, thereby ensuring that the desired snake shape is achieved based on the thermal stress applied. It can be easily obtained. [Embodiment] FIG. 1 shows a first embodiment of a self-deforming thermal expansion/contraction absorption power cable according to the present invention, in which conductors 1 and P. Rim body 2
A metal sheath 4 made of a shape memory alloy and having a sinusoidal snake shape memorized in the phase (mother phase) on the high temperature side is applied on the cable core 3 whose main element is a corrosion protection layer 5 as an outer sheath. has been applied. 2nd VA (a) and (x) show a second embodiment of the self-deforming thermal expansion/contraction absorption power cable according to the present invention, in which a metal sheath is placed on a cable core 3 whose main elements are a conductor l and an insulator 2. 4', using a linear body 7 made of a shape memory alloy and having a linear shape memorized in the phase (mother phase) on the high temperature side, to the power cable body 6 on which the anti-corrosion layer 5 has been sequentially applied; is spirally wound around the outer periphery of the anti-corrosion layer 5 in the axial direction of the cable.
第３図は、前記第一実施例に示す自己変形熱伸縮吸収電
力ケーブルを管路内に布設し且つ通電した状況を示す．
管路ｌＯ内に直線状態で引き込み布設された電力ケーブ
ルｌ１は、管路口部でストッパー１２，ｌ２によって移
動抑止が図られ、人孔１３．１３内に引き出されている
．
そして通電が開始された電力ケーブルは、ジュール熱に
より軸方向の伸び出しが発生し、その伸び出し分はスト
ッパー１２．１２で受け止められて電力ケーブル自身に
圧縮荷重が加わる状態となり、スネーク形状に変形しよ
うとする．ここで、電力ケーブルｌ１は、それ自身に有
する金属シース４も所定温度に加熱されるので、該金属
シース４が高温の相（母相）において記憶しておいたス
ネーク形状に戻ろうとし、それによる曲げ力がケーブル
全体に作用してスネーク形状に曲がる切っ掛けが与えら
れ、延いては符号ｔｔ’で示すようなスネーク形状の電
力ケーブルが形成される。通電が停止されれれば、温度
低下に伴う電力ケーブル自身の収縮力により、かかるス
ネーク形状から直線状態に変位され、その時に金属シー
ス４も、低温の相（マルテンサイト相）に変態する．そ
して、以後の通電時の温度や周囲の環境温度によって生
ずる温度変化に伴うケーブルの伸縮は、かかる変形後の
電力ケーブル１１’におけるスネーク形状の変位により
吸収することができる．第４図は、前記第二実施例に示
す自己変形熱伸縮電力ケーブルを管路内に引き込んで通
電使用されている状態を示す．第３図と同一部分は同一
符号を用いている．
この実施例では、第２図（口）に示す直線状態にして管
路１０内に引き込まれた電力ケーブルが通電開始ととも
に軸方向の伸び出しに相応する熱応力（圧縮荷重）を受
けるとともに、電力ケーブル本体６の周上に螺旋状に巻
き付けられた線状体７が加熱されて高温の相（母相）に
おいて記憶しておいた直線形状に戻ろうとしてケーブル
本体６の全体にわたり螺旋方向に沿って側圧がかかって
曲げ力が作用してスネーク形状に変位しようとする切っ
掛けが与えられ、延いては符号１ｌＯ′に示すようなス
ネーク形状の電力ケーブルが形成される．通電が停止さ
れれれば、温度低下に伴う電力ケーブル自身の収縮力に
より、かかるスネーク形状から直線状態に変位され、そ
の時に線状体６自身も、ケーブルの変位に付随して巻き
付けピッチが小さくなるように変形し低温の相（マルテ
ンサイト相〉に変態する．そして、以後の通電時の温度
や周囲の環境温度によって生ずる温度変化に伴うケーブ
ルの伸縮は、かかる変形後の電力ケーブル１ｌＯ′にお
けるスネーク形状の変位により吸収することができる．
このように線状体７は只単に巻き付ければ良く、それに
対する張力付加等の追加手段を要することがないので、
管路ｌＯ内に対するケーブル本体６の動きを大きく制約
するものとはならない．
〔発明の効果〕
以上の説明によって明らかな通り、本発明にかかる自己
変形熱伸縮吸収電力ケーブルによれば、ケーブルのスネ
ーク形状の変形を大幅に制限してしまうような追加措置
を講ずることなしに、ケーブルの伸び出しによる熱応力
によって所定のスネーク形状が容易に得られるこの種ケ
ーブルを提供するという所期の目的は十分に達威され、
従ってケーブル自身の熱伸縮を自己のスネーク形状の変
位により十分に吸収することが可能となり、延いてはケ
ーブルが管路内に布設された場合でも、大孔内へのケー
ブルの伸び出しが無くなってオフセント部の省略化が可
能とｌ−セ、人孔部の縮小に対応することができるもの
となり、既設管路のスケ一ルアフプに対応できる等々、
これを実施して得られる効果は大きいものといえる．FIG. 3 shows a state in which the self-deforming thermal expansion/contraction absorption power cable shown in the first embodiment is installed in a conduit and energized. The power cable 11, which has been laid in a straight line in the pipe 1O, is prevented from moving by stoppers 12 and 12 at the mouth of the pipe, and is pulled out into the manhole 13.13. When the power cable starts to be energized, it expands in the axial direction due to Joule heat, and this expansion is caught by the stopper 12, 12, and a compressive load is applied to the power cable itself, deforming it into a snake shape. try to. Here, since the metal sheath 4 of the power cable l1 itself is heated to a predetermined temperature, the metal sheath 4 tries to return to the memorized snake shape in the high temperature phase (mother phase), and The bending force exerted on the entire cable provides a snaking edge for bending it into a snake shape, thereby forming a snake-shaped power cable as shown by the symbol tt'. When the power supply is stopped, the power cable is displaced from the snake shape to a straight state due to the contraction force of the power cable itself as the temperature decreases, and at that time, the metal sheath 4 also transforms into a low temperature phase (martensitic phase). Further, the expansion and contraction of the cable due to temperature changes caused by the temperature during subsequent energization and the surrounding environmental temperature can be absorbed by the displacement of the snake shape of the power cable 11' after such deformation. FIG. 4 shows the state in which the self-deforming heat-expandable power cable shown in the second embodiment is drawn into a conduit and is being energized. The same parts as in Figure 3 are given the same symbols. In this embodiment, a power cable drawn into the conduit 10 in a straight state as shown in FIG. The linear body 7 that is spirally wound around the circumference of the cable body 6 is heated and tries to return to the memorized linear shape in the high temperature phase (mother phase), and the wire body 7 wraps around the entire cable body 6 in the helical direction. As a result, lateral pressure is applied and bending force acts on the cable, giving it a chance to shift into a snake shape, resulting in the formation of a snake-shaped power cable as shown at 1lO'. When energization is stopped, the power cable itself is displaced from the snake shape to a straight line state due to the shrinkage force of the power cable itself as the temperature decreases, and at this time, the winding pitch of the linear body 6 itself becomes smaller as the cable is displaced. The cable transforms into a low-temperature phase (martensitic phase).Then, the expansion and contraction of the cable due to temperature changes caused by the temperature during energization and the surrounding environment temperature is caused by the snake in the power cable 1lO' after such deformation. It can be absorbed by the displacement of the shape.
In this way, the linear body 7 can be simply wrapped around it, and there is no need for additional means such as adding tension to it.
This does not greatly restrict the movement of the cable body 6 within the conduit IO. [Effects of the Invention] As is clear from the above explanation, according to the self-deforming thermal expansion/contraction absorption power cable according to the present invention, the self-deforming thermal expansion/contraction absorption power cable can be used without taking any additional measures that would significantly limit the deformation of the snake shape of the cable. , the initial purpose of providing a cable of this type that can easily obtain a predetermined snake shape due to thermal stress caused by elongation of the cable has been fully achieved;
Therefore, the thermal expansion and contraction of the cable itself can be sufficiently absorbed by the displacement of its own snake shape, and even when the cable is installed inside the conduit, the cable does not extend into the large hole. If it is possible to omit the offset section, it will be possible to cope with the reduction of the center and manhole section, and it will be possible to cope with the scale up of the existing pipeline, etc.
It can be said that the effects obtained by implementing this are significant.
第１図は本発明にかかる自己変形熱伸縮吸収電力ケーブ
ルの第一実施例を示す横断面的説明図、第２図は（イ）
（ロ）は本発明にかかる自己変形熱伸縮吸収電力ケーブ
ルの第二実施例を示す横断面的説明図及び側面説明図、
第３図は第一実施例による電力ケーブルの管路内布設状
況を示す説明図、第４図は第二実施例による電力ケーブ
ルの管路内布設状況を示す説明図である．図中、ｌは導
体、２は絶縁体、３はケーブルコア、４は形状記憶合金
により形成された金属シース、４′は通常の金属シース
、５は防食層、６はケーブル本体、７は形状記憶合金に
より製作された線状体、１０は管路、１ｌは自己変形熱
伸縮吸収電力ケーブル、ｌｌ′及び１ｌＯ′はスネーク
形状に変形した電力ケーブル、１２はストッパーである
．１３は人孔である．Fig. 1 is a cross-sectional explanatory diagram showing a first embodiment of the self-deforming thermal expansion/contraction absorption power cable according to the present invention, and Fig. 2 is (a).
(B) is a cross-sectional explanatory view and a side explanatory view showing a second embodiment of the self-deforming thermal expansion and contraction absorption power cable according to the present invention;
FIG. 3 is an explanatory diagram showing how a power cable is installed in a conduit according to the first embodiment, and FIG. 4 is an explanatory diagram showing how a power cable is installed in a conduit according to a second embodiment. In the figure, l is a conductor, 2 is an insulator, 3 is a cable core, 4 is a metal sheath formed of a shape memory alloy, 4' is a normal metal sheath, 5 is a corrosion protection layer, 6 is a cable body, and 7 is a shape A linear body made of a memory alloy, 10 is a conduit, 1l is a self-deforming thermal expansion/contraction absorbing power cable, ll' and 1lO' are power cables deformed into a snake shape, and 12 is a stopper. 13 is the human hole.
Claims (4)
記憶させた縦長部材が長さ方向に配されていることを特
徴とする自己変形熱伸縮吸収電力ケーブル。(1) A self-deforming thermal expansion/contraction absorption power cable characterized in that vertically elongated members made of a shape memory alloy and memorized in a snake shape are arranged in the length direction.
させた縦長部材が長さ方向に螺旋状に配されていること
を特徴とする自己変形熱伸縮吸収ケーブル。(2) A self-deforming thermal expansion/contraction absorption cable characterized in that vertically elongated members made of a shape memory alloy and having a linear shape memorized are arranged spirally in the length direction.
）記載のケーブル。(3) Claim (1) in which the longitudinal member is made of a metal sheath
) Cables listed.
請求項（１）または（２）記載のケーブル。(4) The cable according to claim (1) or (2), wherein the longitudinally elongated member is formed of a linear body or a band-shaped body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23951989A JPH03102713A (en) | 1989-09-14 | 1989-09-14 | Self-deforming heat stretch absorbing power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23951989A JPH03102713A (en) | 1989-09-14 | 1989-09-14 | Self-deforming heat stretch absorbing power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03102713A true JPH03102713A (en) | 1991-04-30 |
Family
ID=17046006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23951989A Pending JPH03102713A (en) | 1989-09-14 | 1989-09-14 | Self-deforming heat stretch absorbing power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03102713A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120547979A (en) * | 2025-07-24 | 2025-08-26 | 晶科能源(海宁)有限公司 | Welding ribbon and photovoltaic module |
-
1989
- 1989-09-14 JP JP23951989A patent/JPH03102713A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120547979A (en) * | 2025-07-24 | 2025-08-26 | 晶科能源(海宁)有限公司 | Welding ribbon and photovoltaic module |
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