JP2004040947A

JP2004040947A - Folding type insulating tube for cable connection, and method of assembling cable connection

Info

Publication number: JP2004040947A
Application number: JP2002196993A
Authority: JP
Inventors: Yoshinari Hane; 羽根　良成
Original assignee: Furukawa Electric Co Ltd
Current assignee: Furukawa Electric Co Ltd
Priority date: 2002-07-05
Filing date: 2002-07-05
Publication date: 2004-02-05
Anticipated expiration: 2022-07-05
Also published as: JP4070092B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding type insulating tube which is possible of connection in narrow space and is excellent in assembly work efficiency, and a method of assembling the cable connection. <P>SOLUTION: Cables 4 and 4' are aligned and both ends are skinned, and both-end sections (sections A and B) are enlarged in diameter. For the center section C, the section A of an insulating tube 1 not enlarged in diameter is set on one cable 4, and the diameter-enlargement supporting member for the section A is removed and then it is mounted on the cable 4. Next, the section B is slid as it is in diameter-enlarged state, thereby being laid temporarily in piles on the diameter-enlarged section (section A) on the side of the other end as shown in Figure (a). Further, after connection of the fellow conductors of the cables 4 and 4', it is slid onto the adherend of the other cable 4', while the section B is enlarged in diameter as shown in Figure (b), and while the above turnup is stretched, the diameter enlargement supporting material 2 at the section B is removed to allow shrinkage, thereby attaching it to a cable connection as shown in Figure (c). <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、電線・ケーブルの直線あるいは分岐接続部の絶縁に使用される折りたたみ型絶縁チューブおよびケーブル接続部の組み立て方法に関する。
【０００２】
【従来の技術】
電線・ケーブルの直線あるいは分岐接続部には、従来ゴム絶縁筒差込み型、常温収縮型、あるいは、熱収縮型などの接続部が使用されてきた。
上記従来の接続部は、いずれも導体接続前に、接続される電線・ケーブルのいずれか一方に、予め絶縁筒や、弾性チューブを仮挿入しておき、導体接続後、これらを取付け位置に戻して組み立てるものであった。
【０００３】
【発明が解決しようとする課題】
上記したように、従来の接続部は、接続される電線・ケーブルのいずれか一方に、予め絶縁筒や、弾性チューブを仮挿入しておくものであり、仮挿入する片側は、絶縁筒の長さ分つまり組みたて後の２倍以上の長さ分の長さ方向スペースが必要であった。
このため、施工スペースの確保できない部分には、使用できず、施工スペース分を含むハンドホールの大きさ、掘削スペースが必要等の問題があり、接続体設置費用高となっていた。
また、施工スペースが取れない場所には、テープ巻き接続が使用されてきたが、狭隘な場所で、作業性が悪く、また、性能が作業スキルに依存すると言う問題点があった。
本発明は、上記事情に鑑みなされたものであって、本発明の目的は、狭隘なスペースでの接続が可能であり、組みたて作業性が良く、さらに、性能が作業スキルに依存しない電線・ケーブル接続部用の折りたたみ型絶縁チューブおよびケーブル接続部の組み立て方法を提供することである。
【０００４】
【課題を解決するための手段】
上記課題を解決するため、本発明においては、ケーブル接続部に装着される絶縁チューブを以下のように構成する。
（１）弾性チューブの両端部分（Ａ，Ｂ部）が拡径支持材により拡径され、中央部分（Ｃ部）に非拡径部分が設けられた、ケーブル接続部に装着される絶縁チューブにおいて、上記中央部分（Ｃ部）の内径を、他方端側の部分（Ａ部）を被着体の外径に上記中央部分（Ｃ部）の厚さの２倍を加えた値より大きくし、絶縁チューブの一方端側の部分（Ｂ部）の拡径状態での内径を、非拡径部分である中央部分（Ｃ部）の外径と同等以上とし、さらに、上記中央部分（Ｃ部）から一方端側部分（Ａ部）の外表面に、粉体もしくは潤滑剤等の滑り剤を塗布し、上記拡径された一方端側部分（Ｂ部）が、上記非拡径部分である中央部分（Ｃ部）を折り返すことにより、他方端側部分（Ａ部）上に重ね合わ可能に構成する。
（２）上記（１）の絶縁チューブにおいて、拡径状態にある上記一方端側の拡径部分（Ｂ部）の拡径支持部材の内径を、拡径状態にある上記他方端の拡径部分（Ａ部）の外径より大きくし、拡径状態にある上記一方端側の拡径部分（Ｂ部）が、上記非拡径部分である中央部分（Ｃ部）を折り返すことにより、拡径状態にある上記他方端側の拡径部分（Ａ部）上に重ね合わされた状態とする。
【０００５】
上記（１）の絶縁チューブは、以下のようにしてケーブル接続部に装着される。
（ａ）　接続するそれぞれのケーブルを位置合わせして切断し、両端を皮剥ぎし、
（ｂ）　絶縁チューブの他方端側の拡径部分（Ａ部）を、一方のケーブルの被着体に挿入し、上記他方端側の拡径支持材を除去して、上記絶縁チューブの他方端側を収縮させて上記被着体に装着し、
（ｃ）　上記絶縁チューブの一方端側の拡径部分（Ｂ部）を、拡径状態のまま上記他方端側にスライドさせて、上記中央部分（Ｃ部）を折り返して、上記他方端側の拡径部分（Ａ部）上に重ね合わせて仮置きし、
（ｄ）　上記ケーブルの導体同士を接続した後、上記一方端側の拡径部分（Ｂ部）を拡径した状態で、他方のケーブルの被着体上にスライドさせて、上記折り返しを伸ばした状態で、一方端側の拡径部分（Ｂ部）の拡径支持材を除去し、上記絶縁チューブの一方端側を収縮させて上記被着体に装着する。
また、上記（２）の絶縁チューブは以下のようにしてケーブル接続部に装着される。
（ａ）　接続するそれぞれのケーブルを位置合わせして切断し、両端を皮剥ぎし、
（ｂ）　一方端側の拡径部分（Ｂ部）が、拡径状態にある他方端側の拡径部分（Ａ部）上に重ね合わされている絶縁チューブを、一方のケーブルの被着体に挿入し、
（ｃ）　上記他方端側の拡径支持材を除去して、上記絶縁チューブの他方端側を収縮させて上記被着体に装着し、
（ｄ）　上記ケーブルの導体同士を接続した後、上記一方端側の拡径部分（Ｂ部）を拡径した状態で、他方のケーブルの被着体上にスライドさせて、上記折り返しを伸ばした状態で、一方端側の拡径部分（Ｂ部）の拡径支持材を除去し、上記絶縁チューブの一方端側を収縮させて上記被着体に装着する。
また、導体接続前に、それぞれのケーブルの被着体上に弾性スベーサチューブを取付けるか、粘着シートを巻きつけ、上記弾性スペーサチューブもしくは粘着テープ上に、上記（１）または（２）の絶縁チューブの両端部分（Ａ，Ｂ部）の拡径部分を収縮させるようにしてもよい。
さらに、接続されるケーブルの一方側が複数のケーブルからなる分岐接続部に適用してもよい。
すなわち、　上記複数のケーブルを複数の挿入孔を有する弾性スペーサチューブに挿入するか、あるいは、該複数のケーブルの周囲に粘着パテシート巻きをし、該弾性スペーサチューブもしくは粘着パテシート上に、前記絶縁チューブの拡径部分を収縮させる。
【０００６】
【発明の実施の形態】
図１（ａ）は本発明の第１の実施例の絶縁チューブの断面図である。
本実施例の絶縁チューブ１は円筒状であり、ゴム等の弾性部材で形成されており、素管（拡径していない状態）の状態では、同図に示すように中央の非拡径部分Ｃの内径は、両端部Ａ，Ｂの外径より大きい。
上記絶縁チューブ１をケーブル接続部に装着する際には、図１（ｂ）に示すように、その両端のＡ部分、Ｂ部分が拡径保持部材２，２’により拡径され、中央の非拡径部分であるＣ部分と、Ａ部分には粉体あるいは潤滑剤等の滑り剤３が塗布される。
上記絶縁チューブ１、上記絶縁チューブ１が取付けられる被着体（ケーブル絶縁体、あるいは、ケーブル絶縁体に取付けられたインナーチューブ、以下被着体という）、および、導体接続部の寸法は、以下の（１）　〜（５）　の寸法に設定される。
（１）　絶縁チューブ１のＢ部分の素管内径（非拡径状態の内径）Ｌｂｉ１は、Ａ部分の素管内径（非拡径状態の内径）Ｌａｉ１と等しいか大きい。
すなわち、以下の関係にある。
Ｌｂｉ１≧Ｌａｉ１
（２）　非拡径部分Ｃ部分における絶縁チューブ１の内径Ｌｃｉは、上記絶縁チューブ１が取り付けられるケーブルの導体接続部の外径Ｌｄ１と等しいか大きい。
すなわち、以下の関係にある。
Ｌｃｉ≧Ｌｄ１
（３）　絶縁チューブ１のＢ部分の拡径状態での内径Ｌｂｉ２　は、非拡径部分であるＣ部分の内径をＬｃｉと等しいか大きい。
すなわち、以下の関係にある。
Ｌｂｉ２　≧Ｌｃｉ
（４）　絶縁チューブ１のＢ部分が装着される被着体の外径Ｌｄ２は、絶縁チューブ１のＡ部分が装着される被着体の外径Ｌｄ３と等しいか大きい。
すなわち、以下の関係にある。
Ｌｄ２≧Ｌｄ３
（５）　絶縁チューブ１のＡ部分が被着体（ケーブル）に装着されたときの、Ａ部分の被着対象外径範囲内における最大外径をＬａｏ１　、非拡径部分であるＣ部分の絶縁チューブ１の厚さをｄｃ　、Ｃ部分における絶縁チューブ１の内径をＬｃｉとすると、以下の関係にある。
Ｌｃｉ＞Ｌａｏ１　＋２ｄｃ
上記寸法とすることにより、後述するように、上記絶縁チューブ１のＢ部分を、Ｃ部分で折り返して、Ａ部分に重ねあわせた状態（この状態を以下では折り畳んだ状態ともいう）とすることができ、また、絶縁チューブ１のＡ部分を被着体に装着後、Ｂ部分をＢ端側にスライドさせ、絶縁チューブ１のＢ部分を被着体上に、容易に取り付けることができる。
なお、一般に、導体接続スリーブや分岐スリーブ、コネクタは、ケーブル接続部より大きい場合が多く、この場合には絶縁チューブ１の中央の非拡径部分であるＣ部分をケーブル絶縁体外径より大きくする必要があるが、Ｃ部分の内径を上記（５）　のようにしておけば、上記のように折り畳んだのち、Ｂ部分をケーブルのＢ端側にスライドさせるのが容易となる。
【０００７】
図２（ａ）（ｂ）（ｃ）は上記絶縁チューブ１をケーブル接続部に取り付ける様子を示す図であり、同図は部分半断面図を示し、上側の断面図のみを示している。
本実施例において絶縁チューブは次のようにケーブル接続部に装着される。
まず、接続するケーブル４，４’を位置合わせして切断し、上記ケーブル４，４’のそれぞれの端部を皮剥ぎし、一方のケーブル４に、図１（ｂ）に示す拡径状態の絶縁チューブ１を挿入する。
なお、この例では、ケーブル４，４’の絶縁体上に、弾性スペーサチューブであるインナーチューブ５，５’が取付けられている。上記インナーチューブ５，５’は、差し込み、あるいは常温収縮により取付けられる。また、弾性体のインナーチューブ５，５’を取付ける代わりに、粘着シートを巻き付けてもよい。
ついで、絶縁チューブ１のＡ部分の拡径保持部材２を除去して、Ａ部分を収縮させ、Ａ部分を被着体（インナーチューブ５）上に装着する。
【０００８】
さらに、絶縁チューブ１のＢ部分に拡径保持部材２’を取付けたまま、図２（ａ）に示すように、上記Ｂ部分をＡ端側にスライドさせ、絶縁チューブ１の中央の非拡径部分Ｃで折り返し、絶縁チューブ１を折り畳んだ状態で、ケーブル４上に仮り置きする。ついで、ケーブル４，４’の導体４ａ，４ａ’を接続する〔図２（ａ）の状態〕。
ついで、絶縁チューブ１のＢ部分を図２（ｂ）に示すように、拡径状態のまま、導体接続部６上をＢ端側にスライドさせ、絶縁チューブ１の折り畳みを伸ばす。
そして、Ｂ部分の拡径保持部材２’を除去し、Ｂ部分をインナーチューブ５’上で収縮させる。これにより、図２（ｃ）に示すように、絶縁チューブ１がケーブル接続部上に装着される。
最後に、絶縁チューブ１の外周の滑り剤３を拭き取り清掃する。
【０００９】
図３（ａ）は、本発明の第２の実施例の絶縁チューブの断面図である。
本実施例の第１の実施例と同様、絶縁チューブ１は円筒状であり、ゴム等の弾性部材で形成されている。素管（拡径していない状態）の状態では、同図に示すように中央の非拡径部分Ｃの内径は、両端部Ａ，Ｂの外径より大きい。
上記絶縁チューブ１をケーブル接続部に装着する際には、図３（ｂ）に示すように、その両端のＡ部分、Ｂ部分が拡径保持部材２，２’により拡径され、中央の非拡径部分であるＣ部分と、Ａ部分には粉体あるいは潤滑剤等の滑り剤３が塗布される。
また、本実施例の場合、絶縁チューブ１のＢ部分に取り付けられる拡径支持部材２’の内径は拡径状態にあるＡ部分の外径より大きい。
【００１０】
図４（ａ）（ｂ）（ｃ）は上記絶縁チューブ１をケーブル接続部に取り付ける様子を示す図であり、同図は部分半断面図を示し、上側の断面図のみを示している。
上記絶縁チューブは次のようにケーブル接続部に装着される。
図３（ｂ）に示した拡径保持部材２，２’で拡径された絶縁チューブ１を、図４（ａ）に示すように、絶縁チューブ１のＢ部分に拡径保持部材２’を取付けたまま、図４（ａ）に示すように、上記Ｂ部分をＡ端側にスライドさせ、絶縁チューブ１の中央の非拡径部分Ｃで折り返し、絶縁チューブ１を折り畳み状態にしておく。上記作業は、出荷前に工場等で行ってもよい。
ついで、接続するケーブル４，４’を位置合わせして切断し、上記ケーブル４，４’のそれぞれの端部を皮剥ぎし、一方のケーブル４に、図４（ａ）に示すように、拡径状態で折り畳まれた絶縁チューブ１を挿入する。
なお、この例では、ケーブル４，４’の絶縁体上に、弾性スペーサチューブであるインナーチューブ５，５’が取付けられている。上記インナーチューブ５，５’は、前記したように差し込み、あるいは常温収縮により取付けられる。
ついで、絶縁チューブ１のＡ部分の拡径保持部材２を除去して、Ａ部分を収縮させ、Ａ部分を被着体（インナーチューブ５）上に装着する。
【００１１】
さらに、絶縁チューブ１のＢ部分を図４（ｂ）に示すように、拡径状態のまま、導体接続部６上をＢ端側にスライドさせ、絶縁チューブ１の折り畳みを伸ばす。
そして、Ｂ部分の拡径保持部材２’を除去し、Ｂ部分をインナーチューブ５’上で収縮させる。これにより、図４（ｃ）に示すように、絶縁チューブ１がケーブル接続部上に装着される。
最後に、絶縁チューブ１の外周の滑り剤３を拭き取り清掃する。
【００１２】
図５は、本発明の第３の実施例を示す図であり、本実施例は本発明を分岐接続部に適用した場合であり、同図は部分断面図を示し、絶縁チューブの上半分のみを示している。なお、図５は前記図２（ｂ）、図４（ｂ）に対応している。
本実施例の絶縁チューブの取り付けは、前記第１、第２の実施例と同様であり、まず、幹線ケーブル４，分岐ケーブル４’４”を位置合わせして切断し、上記ケーブル４，４’４”のそれぞれの端部を皮剥ぎし、一方の幹線ケーブル４に、例えば図１（ｂ）に示した拡径状態の絶縁チューブ１を挿入する。
ついで、絶縁チューブ１のＡ部分の拡径保持部材２を除去して、Ａ部分を収縮させ、Ａ部分を被着体（インナーチューブ５）上に装着する。
さらに、絶縁チューブ１のＢ部分に拡径保持部材２’を取付けたまま、前記図２（ａ）に示したように、上記Ｂ部分をＡ端側にスライドさせ、絶縁チューブ１の中央の非拡径部分Ｃで折り返し、絶縁チューブ１を折り畳み状態で、幹線ケーブル４上に仮り置きする。ついで、幹線ケーブル４と分岐ケーブル４’，４”の導体４ａ，４ａ’，４ａ”を導体分岐スリーブにより接続する。そして、分岐ケーブル４’，４”にパテ材等を巻き付ける。
ついで、絶縁チューブ１のＢ部分を前記図２（ｂ）に示したように、拡径状態のまま、導体接続部６上をスライドさせ絶縁チューブ１の折り畳みを伸ばす。
そして、Ｂ部分の拡径保持部材２’を除去し、Ｂ部分をパテ材上で収縮させる。これにより、絶縁チューブ１が分岐接続部上に装着される。最後に、絶縁チューブ１の外周の滑り剤３を拭き取り清掃する。
なお、前記第２の実施例のように、上記絶縁チューブを、図４（ａ）に示したように折り畳み状態にしておいたものを、幹線ケーブル４に挿入して、Ｂ部分をＡ端側にスライドさせ分岐接続部に取り付けるようにしてもよい。
【００１３】
【発明の効果】
以上説明したように、本発明においては、以下の効果を得ることができる。
（１）拡径された一方端側部分（Ｂ部）を他方端側部分（Ａ部）上に重ね合わせた絶縁チューブを、ケーブル接続部に装着するようにしたので、施工スペースが、従来の半分の長さでよく、土木費、防護物費などが安くすることができる。
（２）絶縁チューブの両端部の外径より、長さ方向中央部の非拡径部の素管内径を太くし、中央部から一方端側部分の外表面に、粉体もしくは潤滑剤等の滑り剤が塗布しているので、折り返し反転、戻しが容易で、組みたて作業性が良い。
（３）導体接続部上に位置する中央部は、非拡径であるため、収縮歪みが加わらない。このため、チューブ損傷に至る可能性が小さい。
（４）テープ巻きが不要であり、性能が作業スキルに依存しない。
（５）狭隘なスペースでの分岐接続を容易に行うことができる。
【図面の簡単な説明】
【図１】本発明の第１の実施例の絶縁チューブの断面図である。
【図２】図１に示す絶縁チューブをケーブル接続部に取り付ける様子を示す図である。
【図３】本発明の第２の実施例の絶縁チューブの断面図である。
【図４】図２に示す絶縁チューブをケーブル接続部に取り付ける様子を示す図である。
【図５】本発明の第３の実施例を示す図である。
【符号の説明】
１　　　　　　　絶縁チューブ
２，２’　　　　拡径保持部材
３　　　　　　　滑り剤
４，４’，４”　ケーブル
５，５’　　　　インナーチューブ
６　　　　　　　導体接続部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a folding type insulating tube used for insulating a straight or branch connection portion of an electric wire / cable and a method of assembling a cable connection portion.
[0002]
[Prior art]
Conventionally, as a straight or branch connection portion of an electric wire / cable, a connection portion such as a rubber insulating cylinder insertion type, a normal temperature shrink type, or a heat shrink type has been used.
In any of the above-mentioned conventional connection parts, before connecting the conductor, an insulating tube or an elastic tube is temporarily inserted in advance into one of the connected electric wires and cables, and after the conductor is connected, these are returned to the mounting position. Was assembled.
[0003]
[Problems to be solved by the invention]
As described above, the conventional connection portion is a device in which an insulating tube or an elastic tube is temporarily inserted in advance into one of electric wires and cables to be connected, and one side to be temporarily inserted is the length of the insulating tube. Therefore, a space in the length direction corresponding to a length twice or more after the assembly is required.
For this reason, it cannot be used in a portion where the construction space cannot be secured, and there is a problem that the size of the handhole including the construction space and a digging space are required, and the connection body installation cost is high.
Tape winding connection has been used in places where construction space is not available. However, there are problems that workability is poor in narrow spaces and that performance depends on work skills.
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric wire that can be connected in a narrow space, has good workability in assembling, and has a performance that does not depend on work skills. To provide a folding insulated tube for a cable connection and a method of assembling the cable connection;
[0004]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, an insulating tube attached to a cable connecting portion is configured as follows.
(1) An insulating tube to be attached to a cable connection portion, in which both end portions (A and B portions) of the elastic tube are enlarged in diameter by a diameter expanding support material and a non-expanded portion is provided in a central portion (C portion). The inner diameter of the central portion (C portion) is made larger than the value obtained by adding twice the thickness of the central portion (C portion) to the outer diameter of the adherend at the other end portion (A portion), The inner diameter in the expanded state of the one end side portion (B portion) of the insulating tube is equal to or larger than the outer diameter of the central portion (C portion) which is a non-expanded portion, and further, the central portion (C portion) A lubricant such as a powder or a lubricant is applied to the outer surface of the one end side portion (part A) from above, and the enlarged one end side portion (part B) is the center which is the non-diameter portion. By folding back the portion (C portion), it is configured to be overlapped on the other end portion (A portion).
(2) In the insulating tube of the above (1), the inner diameter of the expanded support member of the expanded portion (B portion) on the one end side in the expanded state is changed to the expanded diameter portion of the other end in the expanded state. The outer diameter of the portion (A) is larger than the outer diameter, and the expanded portion (B) on the one end side in the expanded state is folded back by the central portion (C), which is the non-expanded portion. It is in a state of being superimposed on the enlarged diameter portion (part A) on the other end side in the state.
[0005]
The insulation tube of the above (1) is attached to the cable connection part as follows.
(A) Align and cut each cable to be connected, peel off both ends,
(B) Insert the enlarged-diameter portion (part A) on the other end side of the insulating tube into the adherend of one cable, remove the enlarged-diameter support material on the other end side, and remove the other end of the insulating tube. Shrink the side and attach it to the adherend,
(C) The enlarged diameter portion (B portion) on one end side of the insulating tube is slid to the other end side in an expanded state, and the central portion (C portion) is folded back to form the other end portion. Overlaid on the enlarged diameter part (part A) and temporarily placed,
(D) After connecting the conductors of the cable, the above-mentioned one end side was slid on the adherend of the other cable in a state where the diameter-expanded portion (part B) was expanded to extend the turn-back. In this state, the diameter-expanding support material at the diameter-expanded portion (part B) on one end side is removed, and the one end side of the insulating tube is contracted and attached to the adherend.
The insulating tube of the above (2) is attached to the cable connecting portion as follows.
(A) Align and cut each cable to be connected, peel off both ends,
(B) The insulated tube in which the enlarged diameter portion (part B) at one end is superimposed on the enlarged diameter portion (part A) at the other end in the enlarged state is attached to the adherend of one cable. Insert
(C) removing the large-diameter support material on the other end side, shrinking the other end side of the insulating tube, and attaching the insulating tube to the adherend;
(D) After connecting the conductors of the cable, the above-mentioned one end side was slid on the adherend of the other cable in a state where the diameter-expanded portion (part B) was expanded to extend the turn-back. In this state, the diameter-expanding support material at the diameter-expanded portion (part B) on one end side is removed, and the one end side of the insulating tube is contracted and attached to the adherend.
Before connecting the conductors, an elastic spacer tube is attached on the adherend of each cable, or an adhesive sheet is wound thereon, and the elastic spacer tube or the adhesive tape is covered with the elastic spacer tube or the adhesive tape. You may make it shrink the expanded diameter part of both ends (A, B part) of an insulating tube.
Furthermore, the present invention may be applied to a branch connection part in which one side of a cable to be connected includes a plurality of cables.
That is, the plurality of cables are inserted into an elastic spacer tube having a plurality of insertion holes, or an adhesive putty sheet is wound around the plurality of cables, and the insulating tube is placed on the elastic spacer tube or the adhesive putty sheet. Shrink the enlarged portion.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1A is a sectional view of an insulating tube according to a first embodiment of the present invention.
The insulating tube 1 of the present embodiment is cylindrical and is formed of an elastic member such as rubber, and in the state of a raw tube (in a state where the diameter is not expanded), as shown in FIG. The inner diameter of C is larger than the outer diameter of both ends A and B.
When the insulating tube 1 is attached to the cable connecting portion, as shown in FIG. A sliding agent 3 such as a powder or a lubricant is applied to the C portion and the A portion which are the enlarged diameter portions.
The dimensions of the insulating tube 1, an adherend to which the insulating tube 1 is attached (a cable insulator, or an inner tube attached to the cable insulator, hereinafter referred to as an adherend), and a conductor connection portion are as follows. (1) to (5) are set.
(1) The inside diameter (inner diameter in the non-expanded state) Lbi1 of the portion B of the insulating tube 1 is equal to or larger than the inner diameter (inner diameter in the non-expanded state) Lai of the portion A.
That is, the following relationship is established.
Lbi1 ≧ Lai1
(2) The inner diameter Lci of the insulating tube 1 in the non-expanded portion C is equal to or larger than the outer diameter Ld1 of the conductor connection portion of the cable to which the insulating tube 1 is attached.
That is, the following relationship is established.
Lci ≧ Ld1
(3) The inner diameter Lbi2 of the portion B of the insulating tube 1 in the expanded state is equal to or larger than the inner diameter of the portion C which is a non-expanded portion.
That is, the following relationship is established.
Lbi2 ≧ Lci
(4) The outer diameter Ld2 of the adherend on which the portion B of the insulating tube 1 is mounted is equal to or larger than the outer diameter Ld3 of the adherend on which the portion A of the insulating tube 1 is mounted.
That is, the following relationship is established.
Ld2 ≧ Ld3
(5) When the portion A of the insulating tube 1 is attached to the adherend (cable), the maximum outer diameter of the portion A within the range of the outer diameter to be adhered is Lao1, and the portion C which is the non-expanded portion is insulated. Assuming that the thickness of the tube 1 is dc and the inner diameter of the insulating tube 1 at the portion C is Lci, the following relationship is established.
Lci> Lao1 + 2dc
With the above dimensions, as will be described later, the portion B of the insulating tube 1 is folded back at the portion C and overlapped with the portion A (hereinafter, this state is also referred to as a folded state). Also, after attaching the portion A of the insulating tube 1 to the adherend, the portion B can be slid to the end B side, and the portion B of the insulating tube 1 can be easily mounted on the adherend.
In general, the conductor connection sleeve, the branch sleeve, and the connector are often larger than the cable connection portion. In this case, it is necessary to make the portion C, which is the central non-expanded portion of the insulating tube 1, larger than the outer diameter of the cable insulator. However, if the inside diameter of the portion C is set as described in the above (5), it becomes easy to slide the portion B toward the end B of the cable after folding as described above.
[0007]
2 (a), 2 (b) and 2 (c) are views showing the manner in which the insulating tube 1 is attached to the cable connection portion. FIG. 2 shows a partial half cross-sectional view, and shows only the upper cross-sectional view.
In this embodiment, the insulating tube is attached to the cable connection as follows.
First, the cables 4 and 4 'to be connected are aligned and cut, and the ends of the cables 4 and 4' are peeled off, and one of the cables 4 is placed in the expanded state shown in FIG. Insert the insulating tube 1.
In this example, inner tubes 5, 5 'which are elastic spacer tubes are mounted on insulators of the cables 4, 4'. The inner tubes 5, 5 'are attached by being inserted or contracted at normal temperature. Further, instead of attaching the inner tubes 5, 5 'made of an elastic body, an adhesive sheet may be wound.
Next, the enlarged diameter holding member 2 at the portion A of the insulating tube 1 is removed, the portion A is contracted, and the portion A is mounted on the adherend (the inner tube 5).
[0008]
Further, while the enlarged diameter holding member 2 'is attached to the B portion of the insulating tube 1, the B portion is slid to the A end side as shown in FIG. It is folded back at the portion C, and the insulating tube 1 is temporarily placed on the cable 4 in a folded state. Next, the conductors 4a and 4a 'of the cables 4 and 4' are connected (the state shown in FIG. 2A).
Next, as shown in FIG. 2B, the B portion of the insulating tube 1 is slid on the conductor connecting portion 6 toward the B end while the diameter of the insulating tube 1 is expanded, and the folding of the insulating tube 1 is extended.
Then, the diameter-expanding holding member 2 'at the portion B is removed, and the portion B is contracted on the inner tube 5'. Thereby, as shown in FIG. 2C, the insulating tube 1 is mounted on the cable connection portion.
Finally, the slip agent 3 on the outer periphery of the insulating tube 1 is wiped off and cleaned.
[0009]
FIG. 3A is a sectional view of an insulating tube according to a second embodiment of the present invention.
As in the first embodiment of the present embodiment, the insulating tube 1 has a cylindrical shape and is formed of an elastic member such as rubber. In the state of the base tube (in a state where the diameter is not expanded), the inner diameter of the central non-expanded portion C is larger than the outer diameter of both ends A and B as shown in FIG.
When the insulating tube 1 is mounted on the cable connecting portion, as shown in FIG. A sliding agent 3 such as a powder or a lubricant is applied to the C portion and the A portion which are the enlarged diameter portions.
Further, in the case of the present embodiment, the inner diameter of the expanded diameter supporting member 2 ′ attached to the portion B of the insulating tube 1 is larger than the outer diameter of the portion A in the expanded state.
[0010]
FIGS. 4A, 4B, and 4C are views showing a state in which the insulating tube 1 is attached to a cable connection portion. FIG. 4 shows a partial half cross-sectional view, and shows only an upper cross-sectional view.
The insulating tube is attached to the cable connection as follows.
As shown in FIG. 4A, the insulating tube 1 whose diameter has been expanded by the expanded diameter holding members 2 and 2 'shown in FIG. 4A, the part B is slid to the end A side and folded back at the central non-expanded portion C of the insulating tube 1 to keep the insulating tube 1 in a folded state. The above operation may be performed at a factory or the like before shipping.
Next, the cables 4 and 4 'to be connected are aligned and cut, the ends of the cables 4 and 4' are peeled off, and one of the cables 4 is expanded as shown in FIG. The insulating tube 1 folded in the diameter state is inserted.
In this example, inner tubes 5, 5 'which are elastic spacer tubes are mounted on insulators of the cables 4, 4'. The inner tubes 5, 5 'are inserted as described above or attached by shrinking at room temperature.
Next, the enlarged diameter holding member 2 at the portion A of the insulating tube 1 is removed, the portion A is contracted, and the portion A is mounted on the adherend (the inner tube 5).
[0011]
Further, as shown in FIG. 4 (b), the B portion of the insulating tube 1 is slid on the conductor connecting portion 6 toward the B end while the diameter of the insulating tube 1 is expanded, and the folding of the insulating tube 1 is extended.
Then, the diameter-expanding holding member 2 'at the portion B is removed, and the portion B is contracted on the inner tube 5'. Thereby, as shown in FIG. 4C, the insulating tube 1 is mounted on the cable connection portion.
Finally, the slip agent 3 on the outer periphery of the insulating tube 1 is wiped off and cleaned.
[0012]
FIG. 5 is a view showing a third embodiment of the present invention. This embodiment is a case where the present invention is applied to a branch connection portion. FIG. Is shown. FIG. 5 corresponds to FIGS. 2B and 4B.
The mounting of the insulating tube of this embodiment is the same as that of the first and second embodiments. First, the main cable 4, the branch cable 4'4 "are aligned and cut, and the cables 4, 4 'are cut. The ends of the 4 ″ are peeled off, and the insulating tube 1 in the expanded state shown in FIG. 1B is inserted into one of the trunk cables 4.
Next, the enlarged diameter holding member 2 at the portion A of the insulating tube 1 is removed, the portion A is contracted, and the portion A is mounted on the adherend (the inner tube 5).
Further, while the enlarged diameter holding member 2 'is attached to the portion B of the insulating tube 1, the portion B is slid toward the end A as shown in FIG. It is folded back at the enlarged diameter portion C, and the insulating tube 1 is temporarily placed on the main cable 4 in a folded state. Next, the trunk cable 4 and the conductors 4a, 4a ', 4a "of the branch cables 4', 4" are connected by a conductor branch sleeve. Then, a putty material or the like is wound around the branch cables 4 ', 4 ".
Then, as shown in FIG. 2B, the B portion of the insulating tube 1 is slid over the conductor connection portion 6 while the diameter is expanded, so that the folding of the insulating tube 1 is extended.
Then, the enlarged diameter holding member 2 ′ at the portion B is removed, and the portion B is contracted on the putty material. Thereby, the insulating tube 1 is mounted on the branch connection part. Finally, the slip agent 3 on the outer periphery of the insulating tube 1 is wiped off and cleaned.
As in the second embodiment, the above-mentioned insulating tube, which is folded as shown in FIG. 4A, is inserted into the trunk cable 4, and the portion B is connected to the A end. May be slid to and attached to the branch connection portion.
[0013]
【The invention's effect】
As described above, in the present invention, the following effects can be obtained.
(1) The insulating tube in which the expanded one end portion (B portion) is overlapped on the other end portion (A portion) is attached to the cable connection portion, so that the installation space is less than the conventional one. The length can be half, and the cost of civil engineering and protective materials can be reduced.
(2) The inner diameter of the non-expanded portion at the central portion in the longitudinal direction is made larger than the outer diameter of both ends of the insulating tube, and powder or lubricant, etc. Since the slip agent is applied, it is easy to turn and turn over and return, and the assembling workability is good.
(3) Since the central portion located on the conductor connection portion has no diameter expansion, no contraction distortion is applied. Therefore, the possibility of damage to the tube is small.
(4) Tape winding is unnecessary, and performance does not depend on work skills.
(5) Branch connection in a narrow space can be easily performed.
[Brief description of the drawings]
FIG. 1 is a sectional view of an insulating tube according to a first embodiment of the present invention.
FIG. 2 is a view showing a state in which the insulating tube shown in FIG. 1 is attached to a cable connection portion.
FIG. 3 is a sectional view of an insulating tube according to a second embodiment of the present invention.
FIG. 4 is a view showing a state in which the insulating tube shown in FIG. 2 is attached to a cable connection portion.
FIG. 5 is a diagram showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulation tube 2, 2 'Diameter expansion holding member 3 Slip agent 4, 4', 4 "cable 5, 5 'Inner tube 6 Conductor connection part

Claims

An insulating tube attached to a cable connection portion, wherein both ends (A and B portions) of an elastic tube are expanded by a diameter-expanding support material and a non-expansion portion is provided in a central portion (C portion),
The inner diameter of the central portion (C portion) of the insulating tube is a value obtained by adding twice the thickness of the central portion (C portion) to the outer diameter of the adherend at the other end portion (A portion). The inner diameter in the expanded state of the portion (B portion) on one end side of the insulating tube is larger than or equal to the outer diameter of the central portion (C portion) which is a non-expanded portion,
A sliding agent such as a powder or a lubricant is applied to the outer surface from the central portion (C portion) to one end side portion (A portion),
The enlarged one end portion (part B) is configured to be overlapped on the other end portion (part A) by folding back the central portion (part C) which is the non-diameter enlarged portion. A foldable insulation tube for a cable connection part.

An inner diameter of the enlarged diameter supporting member at the enlarged diameter portion (part B) on the one end side in the enlarged diameter state is larger than an outer diameter of the enlarged diameter portion (part A) at the other end in the enlarged diameter state;
The central portion (C portion), which is the non-diameter enlarged portion, is folded back so that the enlarged diameter portion (B portion) on the one end side in the enlarged diameter state is enlarged on the other end side (diameter expanded state). 2. The foldable insulation tube for a cable connection part according to claim 1, wherein the foldable insulation tube is overlapped on part A).

A method for assembling a cable connection part using the foldable insulating tube according to claim 1,
Align and cut each cable to be connected, peel off both ends,
The enlarged-diameter portion (part A) at the other end of the insulating tube is inserted into the adherend of one of the cables, and the enlarged-diameter support material at the other end is removed. Shrink and attach to the adherend,
The enlarged diameter portion (B portion) on one end side of the insulating tube is slid to the other end side in the expanded state, and the central portion (C portion) is turned back to expand the diameter portion on the other end side. (Part A) Overlaid on top and temporarily placed,
After connecting the conductors of the above cable,
In the state where the diameter-expanded portion (part B) on the one end side is expanded, the cable is slid onto the adherend of the other cable, and in the state where the turn-back is extended, the diameter-expanded portion (part B) on the one end side is extended. The method for assembling a cable connection portion using a foldable insulating tube, wherein the diameter-enlarged support material is removed, and one end side of the insulating tube is contracted and attached to the adherend.

A method for assembling a cable connection part using the foldable insulating tube according to claim 2,
Align and cut each cable to be connected, peel off both ends,
Inserting the insulating tube in which the enlarged diameter portion (part B) on one end side is superimposed on the enlarged diameter portion (part A) on the other end side in the enlarged state into the adherend of one cable;
Remove the expanded support material on the other end side, shrink the other end side of the insulating tube and attach it to the adherend,
After connecting the conductors of the above cable,
In the state where the diameter-expanded portion (part B) on the one end side is expanded, the cable is slid onto the adherend of the other cable, and in the state where the turn-back is extended, the diameter-expanded portion (part B) on the one end side is extended. The method for assembling a cable connection portion using a foldable insulating tube, wherein the diameter-enlarged support material is removed, and one end side of the insulating tube is contracted and attached to the adherend.

Before connecting the conductor, attach an elastic spacer tube on the adherend of each cable or wrap an adhesive sheet,
The cable using the folding type insulating tube according to claim 3 or 4, wherein the enlarged diameter portions of both end portions (A and B portions) of the insulating tube are contracted on the elastic spacer tube or the adhesive tape. How to assemble the connection.

One side of the cable to be connected is applied to a branch connection portion composed of a plurality of cables,
The plurality of cables are inserted into an elastic spacer tube having a plurality of insertion holes, or an adhesive putty sheet is wound around the plurality of cables, and the diameter of the insulating tube is increased on the elastic spacer tube or the adhesive putty sheet. The method for assembling a cable connecting part using a foldable insulating tube according to claim 3 or 4, wherein the portion is contracted.