JP4652603B2

JP4652603B2 - Cable connection processing method and rubber unit

Info

Publication number: JP4652603B2
Application number: JP2001105113A
Authority: JP
Inventors: 大介武藤; 壮士羽下
Original assignee: THE FURUKAW ELECTRIC CO., LTD.
Current assignee: THE FURUKAW ELECTRIC CO., LTD.
Priority date: 2001-04-03
Filing date: 2001-04-03
Publication date: 2011-03-16
Anticipated expiration: 2021-04-03
Also published as: JP2002305838A

Description

【０００１】
【発明の属する技術分野】
本発明は電力ケーブルの接続部を形成する場合のケーブル接続処理方法及びその接続処理に使用するゴムユニットに関するものである。
【０００２】
【従来の技術】
近年、ケーブル接続処理作業が容易で信頼性の高い接続部を形成するために、外部半導電層を離型性の良い材料で形成した、いわゆるフリーストリッピングタイプと呼ばれる外部半導電層を設けた高圧ゴム・プラスチック絶縁電力ケーブルが開発され使用されるようになっている。
【０００３】
このケーブルの外部半導電層は素材の特性上、従来のボンドタイプのものに比べて厚く形成されている。このため、該ケーブルの接続部を形成する際、図１３に示すように、ケーブル２の接続処理すべき端末を段剥ぎしてケーブルシース３の段剥ぎ切断端から外部半導電層４、ケーブル絶縁層５及び導体口出部６を順次露出させて形成したケーブル段剥ぎ端部１において、外部半導電層４の段剥ぎ切断端４Ａとケーブル絶縁層５間に段差が生じ易い。
【０００４】
そうすると、接続部を形成したとき、その部分にボイド（空隙）ができ、そこから部分放電が発生する等して接続部の電気性能を低下させる原因となる。そこで、前記段差部分を埋めるために、その部分に外部半導電層４の段剥ぎ切断端４Ａからケーブル絶縁層５に跨り、導電性ペイント塗布層７や導電性テープ巻モールド層（図示せず）を設けている。
【０００５】
また、近年、電力ケーブルの中間接続部等の施工性を向上させるために、図１３に示すような拡径支持筒９の外周に常温収縮型のゴム絶縁筒１０を拡径状態で支持してなるゴムユニット８が使用されるようになっている。
【０００６】
この拡径支持筒９は、ポリプロピレン等の紐状体１１をスパイラル筒状に巻回し、その紐状体１１相互を両側縁に形成した凹凸部をかみ合わせ、必要に応じて、そのかみ合わせ部を拡径支持筒９の周方向（紐状体の長さ方向）に沿って超音波等によりスポット溶着して補強することにより、紐状体１１相互を分離可能に連接してなるものである。
【０００７】
また、ゴム絶縁筒１０は、シリコーンゴムやＥＰゴム等の弾性を有する常温収縮型の材料を主体とし筒状に成形して形成された内外部半導電層を有する補強絶縁部材で構成される。そして、拡径支持筒９の外周に、該支持筒９の強度を確保するために、端部に１０〜３０ｍｍ程度の長さ（該支持筒の長手方向の長さ）の余長分９Ｂを残して拡径状態で支持されている。また、ケーブル絶縁層５等との密着性を良好に保ち、界面絶縁性能を保持するために、ゴム絶縁筒１０の内径がケーブル絶縁層５等の外径よりも小さく形成されている。
【０００８】
このゴムユニット８は、後記するように、ケーブル段剥ぎ端部１等のケーブル接続処理部分の外周に嵌め、拡径支持筒９を構成する紐状体１１を解体開始端部９Ａから引き抜いて順次解体し、これに伴い、ゴム絶縁筒１０を順次縮径してケーブル接続処理部分に装着し、接続部を補強絶縁するために用いるものである。このゴムユニット８を用いた接続部は、その構成部品数が少なくケーブル接続処理が簡単なこと、接続部を組み立てる際の品質管理が容易である等の特長を備えている。一般にこのゴムユニット８を用いた接続部はゴム製の１ピース型であるため、接続処理時（組立時）の品質管理ポイントは、ケーブル絶縁層５とゴム絶縁筒１０の界面状態、即ち、突起、傷、異物の有無、密着性等に依存し、界面状態が悪いと、接続部の電気性能を著しく低下させる原因になる。
【０００９】
前記ゴムユニット８を用いて、例えば、ケーブルの中間接続部（直線接続部）を形成するためのケーブル接続処理方法を図１３を参照しながら説明すると、先ず、いずれか一方、例えば、左側のケーブル段剥ぎ端部１のケーブルシース３の外周に予めゴムユニット８を通しておき、両ケーブル段剥ぎ端部１、１の導体口出部６、６同士を接続して導体接続部１２を形成する。
【００１０】
次に、ゴムユニット８を導体接続部１２の上に移動させ、ゴム絶縁筒１０の右端の縮径開始端部１０Ａが、右側のケーブル段剥ぎ端部１における外部半導電層４の段剥ぎ切断端４Ａ近傍で、外部半導電層４の一部に跨るように位置合わせして配置する。
【００１１】
次に、ゴムユニット８を構成する拡径支持筒９の右端の解体開始端部９Ａから、外周にゴム絶縁筒１０が被っていない前記解体開始端部９Ａ側、即ち、右側の余長分９Ｂの紐状体１１を引き抜き、これを拡径支持筒９の内側へ、右側のケーブル段剥ぎ端部１の外部半導電層４からこれに隣り合う内層のケーブル絶縁層５に向けて引き通し、更に、導体接続部１２から左側のケーブル段剥ぎ端部１のケーブル絶縁層５から外部半導電層４に向けて引き通し、拡径支持筒９の左端より外方へ引き出す。この際、紐状体１１をケーブル段剥ぎ端部１、５及び導体接続部１２の周りに回す等して、紐状体１１が捩れたり、ケーブル段剥ぎ端部１等の周りに絡みつかないようにする。以後、紐状体１１を引き抜いて拡径支持筒９を解体する場合にも、このような操作を行う。このようにして、拡径支持筒９の右側の余長分９Ｂを解体開始端部９Ａ側から順次解体する。
【００１２】
次に、前記余長分９Ｂの解体が終了し、ゴム絶縁筒１０が縮径開始端部１０Ａから縮径を始めようとする直前に、ゴムユニット８の位置を確認し、ゴムユニット８が所定位置、即ち、その縮径端部１０Ａが前記外部半導電層４の段剥ぎ切断端４Ａ近傍で、外部半導電層４の一部に跨るような位置からずれている場合には、ゴムユニット８を移動させて位置合わせし直し、正確な位置に再配置する。
【００１３】
このようにして、引き続き、拡径支持筒９を右方から左方に向けて順次解体しながら、ゴム絶縁筒１０を右端の縮径開始端部１０Ａから拡径支持筒９の解体方向に沿って右方から左方へ順次縮径して行き、ゴム絶縁筒１０をケーブル段剥ぎ端部１、１及び導体接続部１２の外周面に所定の面圧で締め付けて装着する。
【００１４】
【発明が解決しようとする課題】
前記したケーブル接続処理方法で、ゴムユニット８の拡径支持筒９を解体してゴム絶縁筒１０を縮径する場合、拡径支持筒９の端部には前記したように、１０〜３０ｍｍ程度の長さの余長分９Ｂが設けられているため、拡径支持筒９の解体開始端部９Ａはその余長分９Ｂの長さ分だけ更に奥側（ケーブルシース３の段剥ぎ切断端側）へ入ったところに位置することになる。
【００１５】
そうすると、拡径支持筒９の余長分９Ｂを解体するために、その解体開始端部９Ａより引き抜いた紐状体１１を、図１４に示すように、拡径支持筒９の内側へ外部半導電層４の外周面、特にその段剥ぎ切断端４Ａや前記導電性ペイント塗布層７（若しくは導電性テープ巻モールド層）の外周面に、外部半導電層４からケーブル絶縁層５に向けて擦らせながら引き通すことになる。また、拡径支持筒９の解体を開始する方の端部で外部半導電層４の前記外周面を擦る恐れがある。
【００１６】
このため、拡径支持筒９の余長分９Ｂを解体するときに、外部半導電層４の一部とか、導電性ペイント塗布層７の導電性ペイント又は導電性テープを剥がしてしまう恐れがある。特に導電性ペイントは一般に外部半導電層４の段剥ぎ切断端４Ａからケーブル絶縁層５に跨って薄く塗布されているため非常に剥がれ易い。そして、紐状体１１は外部半導電層４からケーブル絶縁層５へ向けて引き通すため、図１５に示すように、紐状体１１で擦られて剥がされた導電性ペイント小片７Ａ又は導電性テープ小片、更に外部半導電層４の剥離小片（チップ）がケーブル絶縁層５の外周面に付着する危険性が非常に高い。
【００１７】
このように、ケーブル絶縁層５の外周面に導電性ペイント小片７Ａ等が付着すると、これらがケーブル絶縁層５の外周面とゴム絶縁筒１０の内周面の界面における突起や異物となり、接続部の電気性能を著しく低下させる問題があった。
【００１８】
本発明は、ゴムユニットを用いてケーブルの接続部を組み立てる場合に、拡径支持筒を構成する紐状体や拡径支持筒の端部でケーブル段剥ぎ端部の外部半導電層の外周面、特に段剥ぎ切断端の近傍を擦らないようにし、ケーブル絶縁層の外周面に突起や異物が付着するのを防止して、接続部の電気性能を向上させるようにした新規なケーブル接続処理方法及びゴムユニットを提供するものである。
【００１９】
【課題を解決するための手段】
上記課題を解決する本発明の請求項１記載のケーブル接続処理方法は、１本の紐状体をスパイラル筒状に巻回して紐状体相互を分離可能に連接した拡径支持筒の外周に端部に余長分を残して常温収縮型のゴム絶縁筒を拡径状態で支持し、前記拡径支持筒の前記ゴム絶縁筒の縮径開始端部を拡径支持する箇所に、紐状体相互の連接強度を部分的に大きくした補強部を形成してなるゴムユニットをケーブル段剥ぎ端部の外周に通した後、前記ゴム絶縁筒の縮径を開始するまでの間に、拡径支持筒の解体開始端部を、外部半導電層に隣り合うケーブル絶縁層またはケーブルシースの上に位置させた状態で、拡径支持筒から引き抜いた紐状体を拡径支持筒の内側へ引き通し、拡径支持筒の解体開始端部側の余長分をゴム絶縁筒の縮径開始端部の位置まで予め解体しておき、その後、前記ゴムユニットのゴム絶縁筒を縮径するとき、前記余長分の解体されたゴムユニットのゴム絶縁筒の縮径開始端部を、外部半導電層の段剥ぎ切断端近傍で、外部半導電層の一部に跨る位置に配置し、その位置で当該外部半導電層の外周面を擦らないようにゴムユニットの拡径支持筒の解体を再開し、ゴム絶縁筒を縮径して少なくとも前記段剥ぎ端部の外周に装着する方法である。
【００２０】
また、請求項２記載のケーブル接続処理方法は、１本の紐状体をスパイラル筒状に巻回して紐状体相互を分離可能に連接した拡径支持筒の外周に端部に余長分を残して常温収縮型のゴム絶縁筒を拡径状態で支持し、前記拡径支持筒の前記ゴム絶縁筒の縮径開始端部を拡径支持する箇所に、紐状体相互の連接強度を部分的に大きくした補強部を形成してなるゴムユニットをケーブル段剥ぎ端部の外周に通す前に、前記ゴムユニットの拡径支持筒の解体開始端部側の余長分をゴム絶縁筒の縮径開始端部の位置まで予め解体しておき、その後、前記余長分の解体されたゴムユニットをケーブル段剥ぎ端部の外周に通し、前記ゴムユニットのゴム絶縁筒を縮径するとき、前記余長分の解体されたゴムユニットのゴム絶縁筒の縮径開始端部を、外部半導電層の段剥ぎ切断端近傍で、外部半導電層の一部に跨る位置に配置し、その位置で当該外部半導電層の外周面を擦らないようにゴムユニットの拡径支持筒の解体を再開し、ゴム絶縁筒を縮径して少なくとも前記段剥ぎ端部の外周に装着する方法である。
【００２１】
前記請求項１又は２に記載されたケーブル接続処理方法によると、前記ゴムユニットをケーブル段剥ぎ端部の外周に通す前に、前記ゴムユニットにおける拡径支持筒の解体開始端部側の余長分をゴム絶縁筒の縮径開始端部の位置まで予め解体しておき、又は前記ゴムユニットをケーブル段剥ぎ端部の外周に通した後は、拡径支持筒から引き抜いた紐状体を拡径支持筒の内側へ、ケーブル段剥ぎ端部の外部半導電層からケーブル絶縁層に向けて引き通す箇所を避けて引き通し、拡径支持筒の解体開始端部側の余長分をゴム絶縁筒の縮径開始端部の位置まで予め解体しておくことになる。
【００２２】
そうすると、前記ゴムユニットのゴム絶縁筒をケーブル段剥ぎ端部に配置して縮径するために、ゴムユニットを所定位置、即ち、ゴム絶縁筒の縮径開始端部がケーブル段剥ぎ端部における外部半導電層の段剥ぎ切断端近傍で外部半導電層の一部に跨るように配置すると、拡径支持筒の解体を開始する側の余長分が既に解体除去されているので、拡径支持筒から紐状体を引き抜いて拡径支持筒の解体を再開する位置がゴム絶縁筒が縮径を始める縮径開始端部の位置に来る。
【００２３】
このように、紐状体の引抜き位置が拡径支持筒の余長分が解体除去された分だけ、外部半導電層の段剥ぎ切断端側（ケーブル絶縁層側）へ移動すると、前記ゴムユニットのゴム絶縁筒を縮径するとき、拡径支持筒を解体するために紐状体を引き抜き、これを拡径支持筒の内側へ、ケーブル段剥ぎ端部の外部半導電層からケーブル絶縁層に向けて引き通しても、紐状体が外部半導電層の外周面、特に段剥ぎ切断端近傍の外周面を擦りにくくなる。また、拡径支持筒の解体を開始する方の端部で外部半導電層の前記外周面等を擦るようなことも減少する。
【００２４】
従って、拡径支持筒を構成する紐状体で外部半導電層の特に段剥ぎ切断端の外周面を擦って、外部半導電層の剥離小片（チップ）や、外部半導電層がフリーストリッピングタイプの場合、導電性ペイント小片又は導電性テープ小片がケーブル絶縁層の外周面に付着するようなことがなくなる。このような状態で、拡径支持筒を順次解体し、ゴム絶縁筒を順次縮径するので、両者の界面に突起が生じたり、異物が介在するようなことがなく、良好な界面状態でゴム絶縁筒をケーブル絶縁層等の外周面に所定の面圧で締め付けて装着することが可能になる。その結果、接続部の電気性能を向上させることができ、高信頼性の接続部を提供することができる。
【００２５】
更に、請求項３記載のゴムユニットは、１本の紐状体をスパイラル筒状に巻回して紐状体相互を分離可能に連接した拡径支持筒の外周に端部に余長分を残して常温収縮型のゴム絶縁筒を拡径状態で支持してなるゴムユニットにおいて、前記拡径支持筒の前記ゴム絶縁筒の縮径開始端部を拡径支持する箇所に、紐状体相互の連接強度を部分的に大きくした補強部を形成してなるものである。
【００２６】
このようなゴムユニットを用いると、拡径支持筒の解体開始端部から紐状体を引き抜いて余長分を解体する際、余長分の解体が終了した時点で紐状体を引き抜く引張り抵抗が大きくなるので、余長分の解体が終了したことを確実に知ることができ、余長分の一部未解体部分が生じたり、余長分を越えて拡径支持筒を解体し、ゴム絶縁筒を不用意に縮径したりするのを確実に防止することが可能になる。また、余長分を予め解体したことにより、拡径支持筒の強度が低下するのを抑え、拡径支持筒が予解体した段階で、ゴム絶縁筒が縮径を開始してしまう事態を確実に防止することもできる。従って、ケーブル接続処理作業が容易になり、品質の優れた接続部を組み立てることができる効果を奏する。
【００２７】
【発明の実施の形態】
次に本発明に係るケーブル接続処理方法の実施形態を図面により詳細に説明する。なお、従来技術で説明したものと同一の構成を有するものは、同一の符号を使用し、必要以外の構成の説明を省略する。
【００２８】
図１、２は本発明のケーブル接続処理方法をケーブルの中間接続部を組み立てる場合に適用した例を示すものである。このケーブル接続処理方法を説明すると、先ず、いずれか一方、例えば、左側のケーブル段剥ぎ端部１のケーブルシース３の外周に予めゴムユニット８を通しておき、両ケーブル段剥ぎ端部１、１の導体口出部６、６同士を接続して導体接続部１２を形成する。ゴムユニット８は、紐状体１１をスパイラル筒状に巻回して紐状体相互を分離可能に連接した拡径支持筒９の外周に端部に余長分９Ｂを残して常温収縮型のゴム絶縁筒１０を拡径状態で支持してなるものである。またケーブル段剥ぎ端部１は、ケーブル２の接続処理すべき端末を段剥ぎしてケーブルシース３の段剥ぎ切断端から、フリーストリッピングタイプその他の外部半導電層４、ケーブル絶縁層５及び導体口出部６を順次露出させて形成したものである。
【００２９】
次に、前記ゴムユニット８を、図１に示すように、右方の導体接続部１２の外周上に移動させ、その拡径支持筒９の右端の解体開始端部９Ａが、右側のケーブル段剥ぎ端部１における外部半導電層４の段剥ぎ切断端４Ａよりも左側で、該外部半導電層４に隣り合う内層のケーブル絶縁層５の上に位置するように配置する。
【００３０】
次に、ゴムユニット８を構成する拡径支持筒９の右端の解体開始端部９Ａから、外周にゴム絶縁筒１０が被っていない前記解体開始端部９Ａ側、即ち、右側の余長分９Ｂの紐状体１１を引き抜き、これを拡径支持筒９の内側へ、右側のケーブル段剥ぎ端部１のケーブル絶縁層５、導体接続部１２及び左側のケーブル段剥ぎ端部１のケーブル絶縁層５、外部半導電層４へ向けて引き通し、拡径支持筒９の左端より外方へ引き出す。このようにして、拡径支持筒９の右側に位置する余長分９Ｂだけ予め解体しておく。
【００３１】
次に、前記余長分９Ｂの解体が終了したら、前記余長分９Ｂの解体された前記ゴムユニット８を、所定位置、例えば、図２に示すように、ゴム絶縁筒１０の右端の縮径端部１０Ａが右側のケーブル段剥ぎ端部１の外部半導電層４の段剥ぎ切断端４Ａ近傍で、外部半導電層４の一部に跨るような位置に右側へ移動させて配置する。
【００３２】
次に、その位置で、前記ゴムユニット８の拡径支持筒９から紐状体１１を引き抜いて、拡径支持筒９の解体を再開し、拡径支持筒９を右方から左方に向けて順次解体しながら、ゴム絶縁筒１０を右端の縮径開始端部１０Ａから拡径支持筒９の解体方向に沿って右方から左方へ順次縮径して行き、ゴム絶縁筒１０を両ケーブル段剥ぎ端部１、１の外部半導電層４、４に一部跨るように、導体接続部１２及び両ケーブル絶縁層５、５の外周面に所定の面圧で締め付けて装着する。
【００３３】
前記実施形態のケーブル接続処理方法では、ゴムユニット８を構成する拡径支持筒９の余長分９Ｂの解体を予め右側のケーブル段剥ぎ端部１のケーブル絶縁層５の上で行うもので、拡径支持筒９から引き抜いた紐状体１１を拡径支持筒９の内側へケーブル絶縁層５から導体接続部１１に向けて引き通すことになる。換言すると、前記紐状体１１を拡径支持筒９の内側へケーブル段剥ぎ端部１の外部半導電層４からケーブル絶縁層５に向けて引き通す箇所を避けて引き通し、前記余長分９Ｂを予め解体することになる。
【００３４】
そうすると、紐状体１１が外部半導電層４の外周面、特に段剥ぎ切断端４Ａ近傍の外周面を擦るようなことがなくなる。また、拡径支持筒９の解体を開始する方の端部で外部半導電層４の外周面を擦るようなこともなくなる。従って、拡径支持筒９を構成する紐状体１１で外部半導電層４の外周面、特に段剥ぎ切断端４Ａの外周面を擦って、外部半導電層４の剥離小片（チップ）や、外部半導電層４がフリーストリッピングタイプの場合、導電性ペイント小片又は導電性テープ小片がケーブル絶縁層５の外周面に付着するようなことがなくなり、接続部の電気性能を容易に向上させることができる。
【００３５】
ゴムユニット８をケーブル段剥ぎ端部１の外周に通した後、前記ゴム絶縁筒１０の縮径を開始するまでの間に、拡径支持筒９の解体開始端部側９Ａの余長分９Ｂを予め解体しておくが、拡径支持筒９の余長分９Ｂを解体する箇所（位置）は、図１に示すものに限定されない。即ち、拡径支持筒９の解体開始端部９Ａから引き抜いた紐状体１１を、拡径支持筒９の内側へ、ケーブル段剥ぎ端部１の外部半導電層４からケーブル絶縁層５に向けて引き通す箇所を避けて引き通すことが出来る箇所なら、どの箇所に拡径支持筒９を配置し、その位置で紐状体１１を引き抜いて拡径支持筒９の余長分９Ｂを予め解体するようにしてもよい。
【００３６】
例えば、図３に示すものは、拡径支持筒９の右端の解体開始端部９Ａが、導体接続部１２の上に位置するように、ゴムユニット８を配置し、その箇所で前記余長分９Ｂを予め解体する例を示す。
【００３７】
次に、図４に示すものは、拡径支持筒９の右端の解体開始端部９Ａが、左側のケーブル段剥ぎ端部１のケーブル絶縁層５の上に位置するように、ゴムユニット８を配置し、その箇所で前記余長分９Ｂを予め解体する例を示す。
【００３８】
次に、図５に示すものは、拡径支持筒９の右端の解体開始端部９Ａが、左側のケーブル段剥ぎ端部１の外部半導電層４の上に位置するように、ゴムユニット８を配置し、その箇所で前記余長分９Ｂを予め解体する例を示す。
【００３９】
次に、図６に示すものは、拡径支持筒９の右端の解体開始端部９Ａが、左側のケーブル段剥ぎ端部１のケーブルシース３の上に位置するように、ゴムユニット８を配置し、その箇所で前記余長分９Ｂを予め解体する例を示す。
【００４０】
次に、図７に示すものは、拡径支持筒９の右端の解体開始端部９Ａばかりでなく左端の解体終了端部９Ｃも、右側のケーブル段剥ぎ端部１のケーブルシース３の上に位置するように、ゴムユニット８を配置し、その箇所で前記余長分９Ｂを予め解体する例を示す。
【００４１】
前記図３乃至７に示すような箇所において、拡径支持筒９の余長分９Ｂの解体が終了したら、図示省略するが、図２に示す方法と同様にして、前記余長分９Ｂの解体された前記ゴムユニット８を所定位置、即ち、ゴム絶縁筒１０の右端の縮径端部１０Ａが右側のケーブル段剥ぎ端部１の外部半導電層４の段剥ぎ切断端４Ａ近傍で、外部半導電層４の一部に跨るような位置に移動させて配置する。そして、その位置で、前記ゴムユニット８の拡径支持筒９から紐状体１１を引き抜いて、拡径支持筒９の解体を再開し、拡径支持筒９を順次解体しながら、ゴム絶縁筒１０を順次縮径して、両ケーブル段剥ぎ端部１、１の外部半導電層４、４の一部に跨るように、導体接続部１２及び両ケーブル絶縁層５、５の外周面に所定の面圧で締め付けて装着する。
【００４２】
次に、図８に示すものは、拡径支持筒９の右端の解体開始端部９Ａが、右側のケーブル段剥ぎ端部１のケーブル絶縁層５の上に位置するように、ゴムユニット８を配置し、その箇所で前記余長分９Ｂを予め解体する例を示す。なお、前記解体開始端部９Ａは右側のケーブル段剥ぎ端部１の外部半導電層４、ケーブルシース３又は導体口出部６の上に位置するようにゴムユニット８を配置し、前記余長分９Ｂを予め解体するようにしてもよい。
【００４３】
また、図９に示すものは、拡径支持筒９の右端の解体開始端部９Ａが、左側のケーブル段剥ぎ端部１のケーブル絶縁層５の上に位置するように、ゴムユニット８を配置し、その箇所で前記余長分９Ｂを予め解体する例を示す。なお、前記解体開始端部９Ａは左側のケーブル段剥ぎ端部１の導体口出部６、外部半導電層４又はケーブルシース３の上に位置するようにゴムユニット８を配置し、前記余長分９Ｂを予め解体するようにしてもよい。
【００４４】
図８及び９に示す方法では、拡径支持筒９の余長分９Ｂの予解体が終了したら、導体接続部１２を形成し、更に、図２に示す方法と同様にして、前記余長分９Ｂの解体された前記ゴムユニット８を前記所定位置に移動させて配置し、その位置で以後同様にして、拡径支持筒９の解体を再開し、拡径支持筒９を順次解体しながら、ゴム絶縁筒１０を順次縮径して少なくともケーブル段剥ぎ端部１の外周面に所定の面圧で締め付けて装着する。
【００４５】
前記図８及び９に示す方法は、ケーブル中間接続部（直線接続部）を組み立てる場合だけでなく、ケーブル終端接続部（終端部）を組み立てる場合にも有効な方法であり、本発明は、中間接続部を組み立てる場合のケーブル接続処理方法だけに限定されない。
【００４６】
図１０に示すものは、前記図１乃至９に示すものと異なり、ゴムユニット８をケーブル段剥ぎ端部１の外周に通す前に、前記ゴムユニット８における拡径支持筒９の解体開始端部９Ａ側の余長分９Ｂを予め解体しておく例を示す。この例では、余長分９Ｂの解体が終了後、前記余長分９Ｂの解体されたゴムユニット８を例えば、右側のケーブル段剥ぎ端部１の外周に通して導体接続部１２を形成し、その後、図２に示す方法と同様にして、前記余長分９Ｂの解体された前記ゴムユニット８を前記所定位置に移動させて配置し、その位置で以後同様にして、拡径支持筒９の解体を再開し、拡径支持筒９を順次解体しながら、ゴム絶縁筒１０を順次縮径して少なくともケーブル段剥ぎ端部１の外周面に所定の面圧で締め付けて装着する。
【００４７】
図１１に、前記図１乃至１０に記載した種々のケーブル接続処理方法でゴム絶縁筒１０を両ケーブル段剥ぎ端部１、１の外部半導電層４、４に一部跨るように、導体接続部１２及び両ケーブル絶縁層５、５の外周に装着した状態を示す。
【００４８】
図１２に示すものは、前記したケーブル接続処理方法に使用するゴムユニット８の拡径支持筒９に新しい工夫を施した好ましいゴムユニット１３の例である。このゴムユニット１３は、前記拡径支持筒９の前記ゴム絶縁筒１０の縮径開始端部１０Ａを拡径支持する箇所に、紐状体１１相互の連接強度を部分的に大きくした補強部１４を形成してなるものである。
【００４９】
補強部１４は、例えば、紐状体１１をスパイラル筒状に巻回し、紐状体１１の両側縁相互をかみ合わせたかみ合わせ部に、紐状体１１の長さ方向に所定長（又は、拡径支持筒９の軸線方向に所定長）に亘り形成されている。補強構造は、例えば、紐状体１１相互のかみ合わせ部を、例えば、スポット溶着してないタイプの拡径支持筒９の場合には、スポット溶着して形成される。また、紐状体１１相互のかみ合わせ部を既にスポット溶着等してあるものの場合には、スポット溶着部のスポットピッチを小さくして連続溶着に近付けるか、溶着電流や溶着面積を大きくして個々のスポット溶着強度を強くするか、補強部１４の周長を長くする等して強度を大きくし補強することにより形成する。補強部１４の強度は、紐状体１１相互を分離し、紐状体を引き抜いて拡径支持筒９の解体を再開する作業を阻害しない程度の強さに設定する。
【００５０】
このように拡径支持筒９に補強部１３が形成されていると、拡径支持筒９の解体開始端部９Ａから紐状体１１を引き抜いて余長分９Ｂを解体する際、余長分９Ｂの解体が終了した時点で紐状体１１を引き抜く引張り抵抗が大きくなるので、余長分の解体が終了したことを確実に知ることができる。
【００５１】
前記実施形態の説明では、ゴムユニットにおける拡径支持筒の解体及びゴム絶縁筒の縮径作業を右側から行う場合について説明したが、これらの解体、縮径作業を左側から行うようにしてもよいことは勿論である。
【００５２】
以上説明したように、本発明の請求項１又は２記載のケーブル接続処理方法によると、拡径支持筒のゴム絶縁筒の縮径開始端部を拡径支持する箇所に、紐状体相互の連接強度を部分的に大きくした補強部を形成してなるゴムユニットをケーブル段剥ぎ端部の外周に通す前に、前記ゴムユニットの拡径支持筒の解体開始端部側の余長分を予め解体しておき、又は前記ゴムユニットをケーブル段剥ぎ端部の外周に通した後は、拡径支持筒から引き抜いた紐状体を拡径支持筒の内側へ、ケーブル段剥ぎ端部の外部半導電層からケーブル絶縁層に向けて引き通す箇所を避けて引き通し、拡径支持筒の解体開始端部側の余長分を予め解体しておくので、ゴム絶縁筒を縮径するために拡径支持筒から紐状体を引き抜いて拡径支持筒の内側へ引き通し、その解体を再開しても、紐状体がケーブル段剥ぎ端部の外部半導電層の外周面、特に段剥ぎ切断端近傍の外周面を擦りにくくなる。また、拡径支持筒の解体を開始する方の端部で外部半導電層の前記外周面等を擦るようなことも減少する。また、余長分の解体に際しては、前記ゴムユニットを用いることで、余長分の解体が終了した時点で紐状体を引き抜く引張り抵抗が大きくなるので、余長分の解体が終了したことを確実に知ることができ、余長分を越えて拡径支持筒を解体し、ゴム絶縁筒を不用意に縮径したりするのを確実に防止することが可能になる。
【００５３】
従って、拡径支持筒の解体時に、外部半導電層の剥離小片（チップ）や、外部半導電層がフリーストリッピングタイプの場合、導電性ペイント小片又は導電性テープ小片がケーブル絶縁層の外周面に付着せず、ケーブル絶縁層とゴム絶縁筒の界面に突起が生じたり、異物が介在することがなくなり、良好な界面状態を保持してゴム絶縁筒を縮径装着することが可能となり、接続部の電気性能を向上させることができ、高信頼性の接続部を提供することができる。
【００５４】
更に、請求項３記載のゴムユニットのように、前記拡径支持筒の前記ゴム絶縁筒の縮径開始端部を拡径支持する箇所に、紐状体相互の連接強度を部分的に大きくした補強部を形成しておくと、拡径支持筒の解体開始端部から紐状体を引き抜いて余長分を解体する際、余長分の解体が終了した時点で紐状体を引き抜く引張り抵抗が大きくなるので、余長分の解体が終了したことを確実に知ることができ、余長分の一部未解体部分が生じたり、余長分を越えて拡径支持筒を解体し、ゴム絶縁筒を不用意に縮径したりするのを確実に防止することが可能になる。また、余長分を予め解体したことにより、拡径支持筒の強度が低下するのを抑え、拡径支持筒が予解体した段階で、ゴム絶縁筒が縮径を開始してしまう事態を確実に防止することもできる。従って、ケーブル接続処理作業が容易になり、品質の優れた接続部を組み立てることができる効果を奏する。
【図面の簡単な説明】
【図１】本発明に係るケーブル接続処理方法において、ゴムユニットにおける拡径支持筒の余長分を解体する状態を示す説明図である。
【図２】本発明に係るケーブル接続処理方法において、前記余長分の解体されたゴムユニットをケーブル段剥ぎ端部の外周の所定位置に配置してゴムユニットの拡径支持筒の解体を再開する状態を示す説明図である。
【図３】本発明において、ゴムユニットの拡径支持筒の余長分を予め解体する箇所の変形例を示す図である。
【図４】本発明において、ゴムユニットの拡径支持筒の余長分を予め解体する箇所の更に変形例を示す図である。
【図５】本発明において、ゴムユニットの拡径支持筒の余長分を予め解体する箇所の更に変形例を示す図である。
【図６】本発明において、ゴムユニットの拡径支持筒の余長分を予め解体する箇所の更に変形例を示す図である。
【図７】本発明において、ゴムユニットの拡径支持筒の余長分を予め解体する箇所の更に変形例を示す図である。
【図８】本発明において、導体接続部を形成する前に、ゴムユニットの拡径支持筒の余長分を予め解体する例を示す図である。
【図９】図８の変形例を示す図である。
【図１０】本発明において、ケーブル段剥ぎ端部の外周にゴムユニットを通す前に、ゴムユニットの拡径支持筒の余長分を予め解体する例を示す図である。
【図１１】図１乃至１０に記載したケーブル接続処理方法でゴム絶縁筒を少なくともケーブル段剥ぎ端部の外周に装着した状態を示す断面図である。
【図１２】本発明に使用するゴムユニットの変形例を示す概要図である。
【図１３】従来のケーブル接続処理方法を示す説明図である。
【図１４】従来のケーブル接続処理方法において、ゴムユニットをケーブル段剥ぎ端部の外周に通して、拡径支持筒の余長分を解体している状態を示す説明図である。
【図１５】従来のケーブル接続処理方法で拡径支持筒の余長分を解体することにより、ケーブル絶縁層の外周面に導電性ペイント小片が付着した状態を示す説明図である。
【符号の説明】
１ケーブル段剥ぎ端部
２ケーブル
３ケーブルシース
４外部半導電層
４Ａ段剥ぎ切断端
５ケーブル絶縁層
６導体口出部
７導電性ペイント塗布層
７Ａ導電性ペイント小片
８ゴムユニット
９拡径支持筒
９Ａ解体開始端部
９Ｂ余長分
９Ｃ解体終了端部
１０ゴム絶縁筒
１０Ａ縮径開始端部
１１紐状体
１２導体接続部
１３ゴムユニット
１４補強部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable connection processing method for forming a connection portion of a power cable and a rubber unit used for the connection processing.
[0002]
[Prior art]
In recent years, in order to form a highly reliable connection with easy cable connection processing work, a high voltage with an external semiconducting layer called a so-called free stripping type, in which the external semiconducting layer is formed of a material having good releasability Rubber and plastic insulated power cables have been developed and used.
[0003]
The outer semiconductive layer of this cable is formed thicker than the conventional bond type due to the characteristics of the material. For this reason, when forming the connection portion of the cable, as shown in FIG. 13, the terminal to be connected to the cable 2 is stepped and the outer semiconductive layer 4 and the cable insulation are cut from the stepped cut end of the cable sheath 3. In the cable step stripping end portion 1 formed by sequentially exposing the layer 5 and the conductor lead-out portion 6, a step is likely to occur between the step stripping cut end 4A of the outer semiconductive layer 4 and the cable insulating layer 5.
[0004]
If it does so, when a connection part is formed, a void (gap) will be formed in that part, and it will become the cause of deteriorating the electrical performance of a connection part by generating partial discharge from there. Therefore, in order to fill the stepped portion, the conductive semi-conductive coating layer 7 and the conductive tape winding mold layer (not shown) are straddled across the cable insulating layer 5 from the stepped cut end 4A of the outer semiconductive layer 4 in that portion. Is provided.
[0005]
Further, in recent years, in order to improve the workability of the intermediate connection portion of the power cable and the like, a cold-shrinkable rubber insulating cylinder 10 is supported in an expanded state on the outer periphery of the expanded diameter supporting cylinder 9 as shown in FIG. A rubber unit 8 is used.
[0006]
The diameter-enlarging support cylinder 9 is formed by winding a string-like body 11 such as polypropylene in a spiral cylinder shape, engaging the concavo-convex portions formed on both side edges of the string-like bodies 11, and expanding the engagement portion as necessary. The string-like bodies 11 are connected to each other so as to be separable by spot welding with ultrasonic waves or the like along the circumferential direction of the diameter support cylinder 9 (length direction of the string-like bodies).
[0007]
The rubber insulating cylinder 10 is composed of a reinforcing insulating member having an inner / outer semiconductive layer formed mainly from a room-temperature shrinkable material having elasticity such as silicone rubber or EP rubber and formed into a cylindrical shape. Then, in order to ensure the strength of the support cylinder 9 on the outer periphery of the diameter-enlarged support cylinder 9, an extra portion 9B having a length of about 10 to 30 mm (the length in the longitudinal direction of the support cylinder) is provided at the end. It remains and is supported in an expanded state. Further, in order to maintain good adhesion to the cable insulation layer 5 and the like and to maintain interface insulation performance, the inner diameter of the rubber insulation cylinder 10 is formed smaller than the outer diameter of the cable insulation layer 5 and the like.
[0008]
As will be described later, the rubber unit 8 is fitted on the outer periphery of the cable connection processing portion such as the cable stripping end portion 1 and the like, and the string-like body 11 constituting the diameter expansion support tube 9 is sequentially pulled out from the disassembly start end portion 9A. The rubber insulation cylinder 10 is sequentially reduced in diameter and attached to the cable connection processing portion, and used for reinforcing and insulating the connection portion. The connecting portion using the rubber unit 8 has features such that the number of components is small and cable connection processing is simple, and quality control when assembling the connecting portion is easy. Since the connecting portion using the rubber unit 8 is generally a one-piece type made of rubber, the quality control point at the time of connection processing (assembly) is the interface state between the cable insulating layer 5 and the rubber insulating cylinder 10, that is, the protrusion Depending on scratches, the presence or absence of foreign matter, adhesion, etc., poor interface conditions can cause a significant reduction in the electrical performance of the connection.
[0009]
For example, a cable connection processing method for forming an intermediate connection portion (straight connection portion) of a cable using the rubber unit 8 will be described with reference to FIG. A rubber unit 8 is passed in advance around the outer periphery of the cable sheath 3 of the stepped end portion 1, and the conductor lead-out portions 6, 6 of both cable stepped end portions 1, 1 are connected to form a conductor connecting portion 12.
[0010]
Next, the rubber unit 8 is moved onto the conductor connection portion 12, and the diameter-reducing start end portion 10 A at the right end of the rubber insulating cylinder 10 is stepped off the outer semiconductive layer 4 at the cable step stripped end portion 1 on the right side. In the vicinity of the end 4 A, they are aligned and arranged so as to straddle part of the outer semiconductive layer 4.
[0011]
Next, from the disassembly start end 9A at the right end of the expanded diameter support cylinder 9 constituting the rubber unit 8, the disassembly start end 9A side where the outer periphery is not covered with the rubber insulating cylinder 10, that is, the surplus length 9B on the right side. Is pulled out from the outer semiconductive layer 4 of the right cable step 1 to the inner cable insulating layer 5 adjacent thereto, Further, the conductor connecting portion 12 is drawn from the cable insulating layer 5 of the cable stripping end portion 1 on the left side toward the outer semiconductive layer 4, and is drawn outward from the left end of the enlarged diameter support tube 9. At this time, the string-like body 11 is not twisted or entangled around the cable-step peeled end 1 or the like by turning the string-like body 11 around the cable step peeled ends 1 and 5 and the conductor connecting portion 12. Like that. Thereafter, such an operation is also performed when the string-like body 11 is pulled out and the diameter-enlarged support cylinder 9 is disassembled. In this way, the extra length 9B on the right side of the expanded diameter support cylinder 9 is sequentially disassembled from the disassembly start end 9A side.
[0012]
Next, immediately after the disassembly of the extra length 9B is completed and the rubber insulating cylinder 10 is about to start the diameter reduction from the diameter reduction start end portion 10A, the position of the rubber unit 8 is confirmed. When the position, that is, the reduced-diameter end portion 10A is shifted from the position over the part of the external semiconductive layer 4 in the vicinity of the stepped cut end 4A of the external semiconductive layer 4, the rubber unit 8 Move to realign and reposition to the correct position.
[0013]
In this manner, the rubber insulating cylinder 10 is continuously disassembled from the right end toward the left while the diameter-increasing support cylinder 9 is sequentially disassembled from the right-side diameter-reduction starting end portion 10A along the disassembly direction of the diameter-increasing support cylinder 9. Then, the diameter of the rubber insulating tube 10 is sequentially reduced from right to left, and the rubber insulating cylinder 10 is attached to the outer peripheral surfaces of the cable step stripping ends 1 and 1 and the conductor connection portion 12 with a predetermined surface pressure.
[0014]
[Problems to be solved by the invention]
When the diameter expansion support cylinder 9 of the rubber unit 8 is disassembled and the rubber insulation cylinder 10 is reduced in diameter by the cable connection processing method described above, the end of the diameter expansion support cylinder 9 is about 10 to 30 mm as described above. Since the extra length 9B is provided, the disassembly start end portion 9A of the diameter-enlarged support tube 9 is further back by the length of the extra length 9B (the step of cutting off the step of the cable sheath 3). ) Will be located.
[0015]
Then, in order to disassemble the extra length 9B of the enlarged diameter support cylinder 9, the string-like body 11 pulled out from the disassembly start end 9A is moved to the inside of the enlarged diameter support cylinder 9 as shown in FIG. Rubbing from the outer semiconductive layer 4 toward the cable insulating layer 5 on the outer peripheral surface of the conductive layer 4, especially the outer peripheral surface of the stepped cut end 4 A and the conductive paint coating layer 7 (or conductive tape winding mold layer). I will pass you through. Moreover, there is a possibility that the outer peripheral surface of the outer semiconductive layer 4 may be rubbed at the end of the diameter expansion support cylinder 9 where disassembly starts.
[0016]
For this reason, when the extra length 9B of the expanded diameter support cylinder 9 is disassembled, there is a possibility that a part of the outer semiconductive layer 4 or the conductive paint or conductive tape of the conductive paint coating layer 7 may be peeled off. . In particular, since the conductive paint is generally applied thinly across the cable insulating layer 5 from the stepped cut end 4A of the outer semiconductive layer 4, it is very easy to peel off. Since the string-like body 11 passes from the outer semiconductive layer 4 toward the cable insulating layer 5, as shown in FIG. 15, the conductive paint piece 7A or the conductive paint piece rubbed off by the string-like body 11 is removed. There is a very high risk that the tape pieces and the peeled pieces (chips) of the outer semiconductive layer 4 adhere to the outer peripheral surface of the cable insulating layer 5.
[0017]
As described above, when the conductive paint pieces 7A and the like adhere to the outer peripheral surface of the cable insulating layer 5, they become protrusions and foreign matters at the interface between the outer peripheral surface of the cable insulating layer 5 and the inner peripheral surface of the rubber insulating cylinder 10. There has been a problem that the electrical performance of the device is significantly reduced.
[0018]
When assembling a cable connection portion using a rubber unit, the outer peripheral surface of the outer semiconductive layer at the end of the cable step at the end of the string-like body and the enlarged support tube constituting the enlarged support tube In particular, a new cable connection processing method that improves the electrical performance of the connection part by avoiding rubbing in the vicinity of the stepped cutting edge and preventing the protrusion or foreign matter from adhering to the outer peripheral surface of the cable insulation layer. And a rubber unit.
[0019]
[Means for Solving the Problems]
 In the cable connection processing method according to claim 1 of the present invention for solving the above-mentioned problems, a single string-like body is wound around a spiral cylinder, and the string-like bodies are connected to each other so as to be separable from each other. Support the cold-shrinkable rubber insulation cylinder in an expanded state leaving an extra length at the end.A reinforcing portion is formed by partially increasing the connection strength between the string-like bodies at a location where the diameter-reducing start end of the rubber insulating tube of the diameter-increasing support tube is expanded and supported.After the rubber unit is passed through the outer periphery of the cable stripping end, until the diameter of the rubber insulating cylinder starts to be reduced,With the dismantling start end of the expanded diameter support tube positioned on the cable insulation layer or cable sheath adjacent to the outer semiconductive layer,Inside the expansion support cylinder, the string-like body pulled out from the expansion support cylinderPullWhen disassembling the excess length of the diameter expansion support cylinder on the disassembly start end side to the position of the diameter reduction start end of the rubber insulation cylinder in advance, and then reducing the diameter of the rubber insulation cylinder of the rubber unit , Rubber unit dismantled for the extra lengthThe diameter-reducing start end of the rubber insulating cylinder is positioned near the stepped cut end of the outer semiconductive layer and over a part of the outer semiconductive layer.Place and in that positionDo not rub the outer peripheral surface of the outer semiconductive layerThis is a method in which dismantling of the expanded diameter support cylinder of the rubber unit is resumed, the diameter of the rubber insulating cylinder is reduced, and at least the outer periphery of the stepped end portion is attached.
[0020]
 According to a second aspect of the present invention, there is provided a cable connection processing method according to the present invention, wherein a single string-like body is wound into a spiral cylinder and the string-like bodies are connected to each other so as to be separable from each other. Leave a cold-shrink rubber insulation cylinder in the expanded stateA reinforcing portion is formed by partially increasing the connection strength between the string-like bodies at a location where the diameter-reducing start end of the rubber insulating tube of the diameter-increasing support tube is expanded and supported.Before passing the rubber unit through the outer periphery of the cable stripping end, the disassembly start end side of the diameter expansion support cylinder of the rubber unit is disassembled in advance to the position of the diameter reduction start end of the rubber insulation cylinder. Then, when the rubber unit disassembled for the surplus length is passed through the outer periphery of the cable stripping end and the rubber insulating cylinder of the rubber unit is reduced in diameter, the disassembled rubber unit for the surplus length is disassembled.The diameter-reducing start end of the rubber insulating cylinder is positioned near the stepped cut end of the outer semiconductive layer and over a part of the outer semiconductive layer.Place and in that positionDo not rub the outer peripheral surface of the outer semiconductive layerThis is a method in which dismantling of the expanded diameter support cylinder of the rubber unit is resumed, the diameter of the rubber insulating cylinder is reduced, and at least the outer periphery of the stepped end portion is attached.
[0021]
 According to the cable connection processing method according to claim 1 or 2, before the rubber unit is passed through the outer periphery of the cable step peeling end, the surplus length on the dismantling start end side of the expanded diameter support cylinder in the rubber unit. MinutesTo the position of the diameter reduction start end of the rubber insulation cylinderAfter disassembling in advance, or after passing the rubber unit through the outer periphery of the cable step stripping end, the string-like body pulled out from the diameter expanding support tube is moved to the inside of the diameter expanding support tube, outside the cable step stripping end. Pass through the semi-conductive layer toward the cable insulation layer, avoiding the portion that passes through it, and use the extra length on the disassembly start end side of the expanded support tube.To the position of the diameter reduction start end of the rubber insulation cylinderIt will be dismantled beforehand.
[0022]
Then, in order to reduce the diameter by arranging the rubber insulating cylinder of the rubber unit at the cable step stripping end, the rubber unit has a predetermined position, i.e., the diameter reducing start end of the rubber insulating cylinder is outside the cable step stripping end. If it is arranged so as to straddle part of the outer semiconductive layer in the vicinity of the stepped cut end of the semiconductive layer, the excess length on the side where the disassembly of the expanded diameter support cylinder is started has already been dismantled, so the expanded diameter support The position where the string-like body is pulled out from the cylinder and the disassembly of the diameter-enlarged support cylinder is resumed comes to the position of the diameter reduction start end where the rubber insulating cylinder starts to reduce the diameter.
[0023]
As described above, when the drawing position of the string-like body moves to the stepped cut end side (cable insulation layer side) of the outer semiconductive layer by the amount corresponding to the removal of the excess length of the enlarged diameter support cylinder, the rubber unit When the diameter of the rubber insulation cylinder is reduced, the string-like body is pulled out to disassemble the enlarged diameter support cylinder, and this is pulled inside the diameter expansion support cylinder, from the external semiconductive layer at the cable stripping end to the cable insulation layer. Even if it is pulled through, the string-like body is less likely to rub on the outer peripheral surface of the outer semiconductive layer, particularly the outer peripheral surface in the vicinity of the stepped cut end. In addition, rubbing the outer peripheral surface of the outer semiconductive layer and the like at the end of the diameter expansion support cylinder that starts to be disassembled is also reduced.
[0024]
Therefore, the outer semiconductive layer, particularly the outer peripheral surface of the stepped cut end, is rubbed with the string-like body constituting the expanded support cylinder so that the outer semiconductive layer is peeled off (chip) or the external semiconductive layer is a free stripping type. In this case, the conductive paint piece or the conductive tape piece does not adhere to the outer peripheral surface of the cable insulating layer. In such a state, the diameter expansion support cylinder is disassembled sequentially and the rubber insulation cylinder is sequentially reduced in diameter, so that there is no protrusion at the interface between them and no foreign matter is present, and the rubber is in a good interface state. The insulating cylinder can be attached to the outer peripheral surface of the cable insulating layer or the like with a predetermined surface pressure. As a result, the electrical performance of the connecting portion can be improved, and a highly reliable connecting portion can be provided.
[0025]
 Furthermore, the rubber unit according to claim 3 is:One cord-like body is wound into a spiral cylinder, and the room-temperature-shrinkable rubber insulation cylinder is enlarged, leaving an extra length at the outer periphery of the diameter-enhanced support cylinder connected in a separable manner. Support in stateIn the rubber unit, a reinforcing portion in which the connection strength between the string-like bodies is partially increased is formed at a location where the diameter-reducing start end portion of the rubber insulating cylinder of the diameter-increasing support cylinder is expanded and supported. is there.
[0026]
When such a rubber unit is used, when pulling out the string-like body from the disassembly start end of the expanded diameter support cylinder and disassembling the surplus length, the pulling resistance that pulls out the cord-like body when the surplus length is disassembled Therefore, it is possible to reliably know that the dismantling for the surplus length has been completed, a part of the surplus length that has not been dismantled, or the diameter expansion support cylinder to be dismantled beyond the surplus length, and the rubber It becomes possible to reliably prevent the insulating cylinder from being inadvertently reduced in diameter. In addition, by dismantling the extra length in advance, the strength of the diameter-enlarged support cylinder is prevented from decreasing, and it is ensured that the rubber insulating cylinder starts to reduce the diameter when the diameter-enlarged support cylinder is pre-disassembled. It can also be prevented. Therefore, the cable connection processing work is facilitated, and an effect of assembling a connection portion with excellent quality is achieved.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a cable connection processing method according to the present invention will be described in detail with reference to the drawings. In addition, what has the same structure as what was demonstrated by the prior art uses the same code | symbol, and abbreviate | omits description of a structure other than necessary.
[0028]
1 and 2 show an example in which the cable connection processing method of the present invention is applied to assembling an intermediate connection portion of a cable. The cable connection processing method will be described. First, either one, for example, the rubber unit 8 is passed in advance on the outer periphery of the cable sheath 3 of the left cable step stripping end portion 1, and the conductors of both cable step stripping end portions 1, 1. The lead portions 6 and 6 are connected to each other to form the conductor connection portion 12. The rubber unit 8 is a room-temperature-shrinkable rubber that leaves an extra length 9B on the outer periphery of a diameter-enhanced support tube 9 that is formed by winding a string-like body 11 into a spiral cylinder and detachably connected to each other. The insulating cylinder 10 is supported in an expanded state. Further, the cable step stripping end portion 1 strips the end of the cable 2 to be connected and from the step stripping end of the cable sheath 3 to the free stripping type other external semiconductive layer 4, the cable insulating layer 5 and the conductor port. The protruding portions 6 are formed by sequentially exposing them.
[0029]
Next, as shown in FIG. 1, the rubber unit 8 is moved onto the outer periphery of the right conductor connecting portion 12, and the dismantling start end portion 9 A at the right end of the enlarged diameter support tube 9 is connected to the right cable step. The outer semiconductive layer 4 is arranged on the left side of the stepped cut end 4 A of the outer semiconductive layer 4 so as to be positioned on the inner cable insulating layer 5 adjacent to the outer semiconductive layer 4.
[0030]
Next, from the disassembly start end 9A at the right end of the expanded diameter support cylinder 9 constituting the rubber unit 8, the disassembly start end 9A side where the outer periphery is not covered with the rubber insulating cylinder 10, that is, the surplus length 9B on the right side. The string-like body 11 is pulled out, and the cable-insulating layer 5 of the right cable step stripped end 1, the conductor connecting portion 12, and the cable insulating layer of the left cable step stripped end 1 are drawn inside the diameter-enlarged support tube 9. 5. Pull it toward the outer semiconductive layer 4 and pull it outward from the left end of the expanded diameter support tube 9. In this manner, the remaining length 9B located on the right side of the diameter-enlarged support cylinder 9 is disassembled in advance.
[0031]
Next, when the disassembly of the surplus length 9B is completed, the disassembled rubber unit 8 of the surplus length 9B is placed at a predetermined position, for example, as shown in FIG. The end portion 10 A is moved to the right side in the vicinity of the stepped cut end 4 A of the outer semiconductive layer 4 of the right cable step stripped end portion 1 so as to straddle part of the outer semiconductive layer 4.
[0032]
Next, at that position, the string-like body 11 is pulled out from the diameter-enlarged support cylinder 9 of the rubber unit 8 to resume the disassembly of the diameter-enlarged support cylinder 9, and the diameter-enlarged support cylinder 9 is directed from the right to the left. While sequentially disassembling, the diameter of the rubber insulating cylinder 10 is gradually reduced from the right to the left along the dismantling direction of the diameter expansion supporting cylinder 9 from the diameter-reducing start end 10A at the right end, The cable connection strip 12 and the cable insulation layers 5 and 5 are fastened with a predetermined surface pressure so as to partially extend over the outer semiconductive layers 4 and 4 of the cable stripping ends 1 and 1.
[0033]
In the cable connection processing method of the embodiment, disassembly of the extra length 9B of the enlarged diameter support cylinder 9 constituting the rubber unit 8 is performed on the cable insulating layer 5 of the right cable stripping end 1 in advance. The string-like body 11 pulled out from the enlarged diameter support cylinder 9 is drawn from the cable insulating layer 5 toward the conductor connection portion 11 inside the enlarged diameter support cylinder 9. In other words, the string-like body 11 is routed through the inside of the diameter-enlarged support tube 9 while avoiding the location where the cable step stripped end 1 is led from the outer semiconductive layer 4 toward the cable insulating layer 5, 9B will be dismantled beforehand.
[0034]
As a result, the string 11 does not rub against the outer peripheral surface of the outer semiconductive layer 4, particularly the outer peripheral surface in the vicinity of the stepped cut end 4A. Further, the outer peripheral surface of the outer semiconductive layer 4 is not rubbed at the end of the diameter expansion support tube 9 where disassembly starts. Accordingly, the string-like body 11 constituting the diameter-enlarged support cylinder 9 rubs the outer peripheral surface of the outer semiconductive layer 4, particularly the outer peripheral surface of the stepped cutting end 4 A, When the outer semiconductive layer 4 is a free stripping type, the conductive paint piece or the conductive tape piece does not adhere to the outer peripheral surface of the cable insulating layer 5, and the electrical performance of the connecting portion can be easily improved. it can.
[0035]
After passing the rubber unit 8 through the outer periphery of the cable stripping end portion 1 and before starting to reduce the diameter of the rubber insulating tube 10, an extra length 9 B on the disassembly start end side 9 A of the diameter expansion support tube 9. Is disassembled in advance, but the location (position) where the extra length 9B of the enlarged diameter support tube 9 is disassembled is not limited to that shown in FIG. That is, the string-like body 11 pulled out from the disassembling start end portion 9A of the diameter-enlarged support cylinder 9 is directed to the inside of the diameter-enlarged support cylinder 9 from the external semiconductive layer 4 of the cable step stripped end 1 toward the cable insulating layer 5. If it is a place that can be pulled away, the diameter expansion support cylinder 9 is arranged at any position, and the string-like body 11 is pulled out at that position to disassemble the extra length 9B of the diameter expansion support cylinder 9 in advance. You may make it do.
[0036]
For example, as shown in FIG. 3, the rubber unit 8 is disposed so that the disassembly start end portion 9A at the right end of the diameter-enlarged support tube 9 is located on the conductor connection portion 12, and the portion corresponding to the extra length is disposed at that location. An example of dismantling 9B in advance will be shown.
[0037]
Next, as shown in FIG. 4, the rubber unit 8 is placed so that the dismantling start end portion 9 A at the right end of the diameter expansion support tube 9 is positioned on the cable insulating layer 5 at the cable stripping end portion 1 on the left side. An example is shown in which the remaining length 9B is disassembled in advance at the location.
[0038]
Next, what is shown in FIG. 5 is a rubber unit 8 so that the disassembly start end portion 9A at the right end of the diameter-enlarged support tube 9 is positioned on the outer semiconductive layer 4 of the cable stripping end portion 1 on the left side. An example in which the surplus length 9B is disassembled in advance at that location is shown.
[0039]
Next, as shown in FIG. 6, the rubber unit 8 is arranged so that the disassembly start end portion 9 A at the right end of the diameter expansion support tube 9 is positioned on the cable sheath 3 of the cable stripping end portion 1 on the left side. Then, an example in which the extra length 9B is disassembled in advance at that location will be shown.
[0040]
Next, what is shown in FIG. 7 is that not only the right disassembly start end portion 9A but also the left end disassembly end portion 9C on the cable sheath 3 of the cable stripping end portion 1 on the right side. An example is shown in which the rubber unit 8 is arranged so as to be positioned, and the extra length 9B is disassembled in advance at that location.
[0041]
3 to 7, when the disassembly of the extra length 9B of the enlarged diameter support cylinder 9 is finished, the illustration is omitted, but in the same manner as the method shown in FIG. The rubber unit 8 is placed in a predetermined position, that is, the reduced diameter end portion 10A at the right end of the rubber insulating cylinder 10 is located in the vicinity of the stepped cut end 4A of the outer semiconductive layer 4 of the right cable stepped end portion 1. The conductive layer 4 is disposed so as to move over a part of the conductive layer 4. At that position, the string-like body 11 is pulled out from the diameter-enlarged support cylinder 9 of the rubber unit 8 and the disassembly of the diameter-enlarged support cylinder 9 is resumed. 10 is successively reduced in diameter, and the conductor connection portion 12 and the outer peripheral surfaces of the two cable insulating layers 5 and 5 are predetermined so as to straddle part of the outer semiconductive layers 4 and 4 of the two cable step stripped ends 1 and 1. Tighten with surface pressure of
[0042]
Next, as shown in FIG. 8, the rubber unit 8 is placed so that the disassembly start end portion 9 A at the right end of the diameter expanding support tube 9 is positioned on the cable insulating layer 5 at the cable step stripping end portion 1 on the right side. An example is shown in which the remaining length 9B is disassembled in advance at the location. A rubber unit 8 is disposed so that the dismantling start end portion 9A is positioned on the outer semiconductive layer 4, the cable sheath 3 or the conductor outlet portion 6 of the right cable stripping end portion 1, and the extra length The minute 9B may be disassembled in advance.
[0043]
9, the rubber unit 8 is arranged so that the disassembly start end portion 9A at the right end of the diameter-enlarging support tube 9 is positioned on the cable insulating layer 5 at the cable stripping end portion 1 on the left side. Then, an example in which the extra length 9B is disassembled in advance at that location will be shown. The rubber unit 8 is disposed so that the dismantling start end portion 9A is positioned on the conductor lead-out portion 6, the outer semiconductive layer 4 or the cable sheath 3 of the left cable stripping end portion 1, and the extra length The minute 9B may be disassembled in advance.
[0044]
In the method shown in FIGS. 8 and 9, when the pre-disassembly of the extra length 9B of the diameter-enlarged support cylinder 9 is completed, the conductor connecting portion 12 is formed, and, in the same manner as the method shown in FIG. The rubber unit 8 disassembled of 9B is moved to the predetermined position and arranged in the same manner, and thereafter, the disassembly of the enlarged diameter support cylinder 9 is resumed and the enlarged diameter support cylinder 9 is sequentially disassembled, The rubber insulating cylinders 10 are sequentially reduced in diameter and attached to at least the outer peripheral surface of the cable step stripping end portion 1 with a predetermined surface pressure.
[0045]
The method shown in FIGS. 8 and 9 is an effective method not only when assembling a cable intermediate connection part (straight line connection part) but also when assembling a cable terminal connection part (termination part). It is not limited only to the cable connection processing method when assembling the connection portion.
[0046]
10 is different from those shown in FIGS. 1 to 9 before the rubber unit 8 is passed through the outer periphery of the cable step stripping end 1 before the dismantling start end of the diameter-enlarging support tube 9 in the rubber unit 8. An example is shown in which the 9A extra length 9B is disassembled in advance. In this example, after the disassembly of the surplus length 9B is completed, the conductor connecting portion 12 is formed by passing the disassembled rubber unit 8 of the surplus length 9B through, for example, the outer periphery of the right cable stripping end portion 1, Thereafter, in the same manner as in the method shown in FIG. 2, the rubber unit 8 disassembled by the extra length 9B is moved to the predetermined position and arranged in the same manner. The disassembly is resumed, and the rubber insulating cylinders 10 are successively reduced in diameter while the diameter-enlarged support cylinders 9 are sequentially disassembled, and are tightened and attached to at least the outer peripheral surface of the cable step stripping end 1 with a predetermined surface pressure.
[0047]
In FIG. 11, the conductor connection is made so that the rubber insulating tube 10 is partially straddled over the outer semiconductive layers 4 and 4 of both cable stepped end portions 1 and 1 by the various cable connection processing methods described in FIGS. The state which was mounted | worn to the outer periphery of the part 12 and both cable insulation layers 5 and 5 is shown.
[0048]
FIG. 12 shows an example of a preferable rubber unit 13 in which a new device is applied to the diameter-expanded support tube 9 of the rubber unit 8 used in the above-described cable connection processing method. The rubber unit 13 includes a reinforcing portion 14 in which the connection strength between the string-like bodies 11 is partially increased at a location where the diameter-reducing start end portion 10A of the rubber insulating tube 10 of the diameter-increasing support tube 9 is expanded. Is formed.
[0049]
The reinforcing portion 14 is, for example, wound around the string-like body 11 in a spiral cylindrical shape, and meshed with both side edges of the string-like body 11 with a predetermined length (or an enlarged diameter) in the length direction of the string-like body 11. It is formed over a predetermined length in the axial direction of the support cylinder 9. The reinforcing structure is formed by spot welding, for example, in the case of the enlarged diameter support tube 9 of the type in which the string-like bodies 11 are not spot-welded. Further, in the case where the meshed portions of the string-like bodies 11 have already been spot welded or the like, the spot pitch of the spot welded portions is reduced to approach continuous welding, or the welding current and the welding area are increased to increase the individual welding distance. It is formed by increasing the strength by reinforcing the spot welding strength or increasing the circumferential length of the reinforcing portion 14. The strength of the reinforcing portion 14 is set to a strength that does not hinder the work of separating the string-like bodies 11 from each other, pulling out the string-like bodies, and restarting the dismantling of the enlarged diameter support cylinder 9.
[0050]
Thus, when the reinforcement part 13 is formed in the diameter expansion support cylinder 9, when pulling out the string-like body 11 from the disassembly start end part 9A of the diameter expansion support cylinder 9 and disassembling the extra length 9B, the extra length When the disassembly of 9B is completed, the tensile resistance for pulling out the string-like body 11 is increased, so that it can be surely known that the disassembly for the extra length has been completed.
[0051]
In the description of the above embodiment, the case where the dismantling of the diameter-enlarging support cylinder and the diameter-reducing operation of the rubber insulating cylinder in the rubber unit are performed from the right side has been described, but these disassembly and diameter-reducing operations may be performed from the left side. Of course.
[0052]
 As described above, according to the cable connection processing method of claim 1 or 2 of the present invention,A rubber unit formed by forming a reinforcing portion in which the joint strength between the string-like bodies is partially increased at a location where the diameter-reducing start end of the rubber-insulated tube of the diameter-enlarged support tube is expanded and supported.Before passing through the outer periphery of the cable step stripping end, the excess length of the rubber unit diameter expansion support tube on the disassembly start end side is disassembled in advance, or the rubber unit is connected to the outer periphery of the cable step stripping end. After passing through the cable, the string-like body pulled out from the diameter-enhanced support cylinder is passed inside the diameter-enlarged support cylinder, avoiding the location where it is led from the external semiconductive layer at the cable stripping end toward the cable insulation layer. Since the surplus length on the disassembly start end side of the diameter expansion support cylinder is disassembled in advance, the string-like body is pulled out from the diameter expansion support cylinder and the inside of the diameter expansion support cylinder to reduce the diameter of the rubber insulating cylinder Even if it is pulled through and the disassembly is resumed, it becomes difficult for the string-like body to rub the outer peripheral surface of the outer semiconductive layer at the cable step stripping end, particularly the outer peripheral surface near the step stripping cut end. In addition, rubbing the outer peripheral surface of the outer semiconductive layer and the like at the end of the diameter expansion support cylinder that starts to be disassembled is also reduced.Also, when dismantling for the surplus length, by using the rubber unit, when the disassembly for the surplus length is completed, the tensile resistance for pulling the string-like body increases, so that the disassembly for the surplus length is completed. It is possible to reliably know, and it is possible to reliably prevent the diameter-increasing support cylinder from being disassembled beyond the surplus length and inadvertently reducing the diameter of the rubber insulating cylinder.
[0053]
Therefore, when disassembling the expanded support cylinder, if the outer semiconductive layer is peeled off (chip) or the outer semiconductive layer is a free stripping type, the conductive paint piece or the conductive tape piece is placed on the outer peripheral surface of the cable insulation layer. Without sticking, no protrusions or foreign objects are present at the interface between the cable insulation layer and the rubber insulation cylinder, making it possible to reduce the diameter of the rubber insulation cylinder while maintaining a good interface state. The electrical performance can be improved, and a highly reliable connection portion can be provided.
[0054]
Further, as in the rubber unit according to claim 3, the connection strength between the string-like bodies is partially increased at a location where the diameter-reduction starting end portion of the rubber insulating cylinder of the diameter-expanding support cylinder is expanded. When the reinforcing part is formed, when pulling out the string-like body from the disassembly start end of the diameter-enlarged support cylinder and disassembling the excess length, the tensile resistance that pulls out the string-like body when the extra length is disassembled Therefore, it is possible to reliably know that the dismantling for the surplus length has been completed, a part of the surplus length that has not been dismantled, or the diameter expansion support cylinder to be dismantled beyond the surplus length, and the rubber It becomes possible to reliably prevent the insulating cylinder from being inadvertently reduced in diameter. In addition, by dismantling the extra length in advance, the strength of the diameter-enlarged support cylinder is prevented from decreasing, and it is ensured that the rubber insulating cylinder starts to reduce the diameter when the diameter-enlarged support cylinder is pre-disassembled. It can also be prevented. Therefore, the cable connection processing work is facilitated, and an effect of assembling a connection portion with excellent quality is achieved.
[Brief description of the drawings]
In the cable connection processing method according to the present invention, FIG. 1 is an explanatory view showing a state in which a surplus length of a diameter expansion support cylinder in a rubber unit is disassembled.
In the cable connection processing method according to the present invention, the rubber unit disassembled for the surplus length is disposed at a predetermined position on the outer periphery of the cable stripping end portion, and the dismantling of the expanded diameter support cylinder of the rubber unit is resumed. It is explanatory drawing which shows the state to do.
FIG. 3 is a view showing a modified example of a portion where a surplus length of a diameter expansion support cylinder of a rubber unit is disassembled in advance in the present invention.
FIG. 4 is a view showing a further modified example of a portion where a surplus length of a diameter expansion support tube of a rubber unit is disassembled in advance in the present invention.
FIG. 5 is a view showing a further modified example of a portion where a surplus length of a diameter expansion support cylinder of a rubber unit is disassembled in advance in the present invention.
FIG. 6 is a view showing a further modified example of a portion where a surplus length of a diameter expansion support cylinder of a rubber unit is disassembled in advance in the present invention.
FIG. 7 is a view showing a further modified example of a portion where a surplus length of a diameter expansion support cylinder of a rubber unit is disassembled in advance in the present invention.
FIG. 8 is a view showing an example in which an extra length of a diameter expansion support cylinder of a rubber unit is disassembled in advance before forming a conductor connection part in the present invention.
FIG. 9 is a diagram showing a modification of FIG.
FIG. 10 is a view showing an example in which the extra length of a diameter-enlarged support cylinder of a rubber unit is disassembled in advance before the rubber unit is passed through the outer periphery of the cable stripping end in the present invention.
11 is a cross-sectional view showing a state in which a rubber insulating cylinder is mounted on at least the outer periphery of the cable step peeling end by the cable connection processing method described in FIGS. 1 to 10; FIG.
FIG. 12 is a schematic view showing a modification of the rubber unit used in the present invention.
FIG. 13 is an explanatory diagram showing a conventional cable connection processing method.
FIG. 14 is an explanatory view showing a state in which the rubber unit is passed through the outer periphery of the cable stripping end portion and the extra length of the expanded diameter support cylinder is disassembled in the conventional cable connection processing method.
FIG. 15 is an explanatory view showing a state in which conductive paint pieces are attached to the outer peripheral surface of the cable insulation layer by dismantling the extra length of the diameter-enlarged support tube by a conventional cable connection processing method.
[Explanation of symbols]
1 Cable stripped end
2 Cable
3 Cable sheath
4 External semiconductive layer
4A Stepped cut end
5 Cable insulation layer
6 Conductor outlet
7 Conductive paint coating layer
7A conductive paint piece
8 Rubber unit
9 Expanded support cylinder
9A Dismantling start end
9B extra length
9C End of dismantling
10 Rubber insulation cylinder
10A Reduced diameter start end
11 String
12 Conductor connection
13 Rubber unit
14 Reinforcement part

Claims

One cord-like body is wound into a spiral cylinder, and the room-temperature-shrinkable rubber insulation cylinder is enlarged, leaving an extra length at the outer periphery of the diameter-enhanced support cylinder connected in a separable manner. A rubber formed by forming a reinforcing portion in which the joint strength between the string-like bodies is partially increased at a location where the diameter-reducing start end of the rubber insulating tube of the diameter-insulating support tube is expanded and supported. After passing the unit through the outer periphery of the cable stripping end, the disassembly start end of the expanded diameter support cylinder is connected to the outer semiconductive layer between the start of the diameter reduction of the rubber insulation cylinder. or in a state of being positioned over the cable sheath, the string-like body is pulled out from the expanded diameter support tube through pull inward of the enlarged diameter supporting tube, rubber excess length dismantling start end portion side of the enlarged diameter support tube Disassemble to the position of the diameter reduction start end of the insulating cylinder in advance, and then reduce the diameter of the rubber insulating cylinder of the rubber unit. When the contraction-diameter starting end of the rubber insulating tube demolition rubber units of the extra length fraction, in stage stripping the cut end near the outer semiconductive layer, it was disposed in a position spanning a portion of the outer semiconductive layer, At that position, the disassembly of the diameter-enhanced support cylinder of the rubber unit is resumed so as not to rub the outer peripheral surface of the outer semiconductive layer, and the rubber insulating cylinder is reduced in diameter and attached to at least the outer periphery of the stepped end. A characteristic cable connection processing method.

One cord-like body is wound into a spiral cylinder, and the room-temperature-shrinkable rubber insulation cylinder is enlarged, leaving an extra length at the outer periphery of the diameter-enhanced support cylinder connected in a separable manner. A rubber formed by forming a reinforcing portion in which the joint strength between the string-like bodies is partially increased at a location where the diameter-reducing start end of the rubber insulating tube of the diameter-insulating support tube is expanded and supported. Before passing the unit over the outer periphery of the cable stripping end, the excess length of the rubber unit diameter expansion support tube on the disassembly start end side is disassembled in advance to the position of the diameter reduction start end of the rubber insulation tube. Then, when the rubber unit disassembled for the surplus length is passed through the outer periphery of the cable step stripping end and the rubber insulating cylinder of the rubber unit is reduced in diameter, the rubber insulation of the disassembled rubber unit for the surplus length is removed. A part of the outer semiconducting layer is formed near the stepped end of the outer semiconducting layer at the diameter reduction start end of the cylinder. Arranged at a position straddling, resume dismantling of the enlarged diameter support tube of rubber unit so as not to rub the peripheral surface of the outer semiconducting layer at that position, at least the stepped strip end reduced in diameter rubber insulating tube A cable connection processing method characterized by being attached to the outer periphery.

One cord-like body is wound into a spiral cylinder, and the room-temperature-shrinkable rubber insulation cylinder is enlarged, leaving an extra length at the outer periphery of the diameter-enhanced support cylinder connected in a separable manner. In the rubber unit that is supported in a state, a reinforcing portion in which the connection strength between the string-like bodies is partially increased is provided at a location where the diameter-reducing start end portion of the rubber-insulating tube of the diameter-increasing support tube is expanded. A rubber unit characterized by being formed.