JP5496592B2 - Underground cable connection protection tube - Google Patents

Underground cable connection protection tube Download PDF

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JP5496592B2
JP5496592B2 JP2009235694A JP2009235694A JP5496592B2 JP 5496592 B2 JP5496592 B2 JP 5496592B2 JP 2009235694 A JP2009235694 A JP 2009235694A JP 2009235694 A JP2009235694 A JP 2009235694A JP 5496592 B2 JP5496592 B2 JP 5496592B2
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tube
underground cable
connection part
underground
protective tube
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JP2011083172A (en
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英司 平川
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Chugoku Electric Power Co Inc
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本発明は、地中配電線路における地中電力ケーブル（以下、地中ケーブルという。）の接続部を保護するために用いられる地中ケーブル接続部保護管に関する。   The present invention relates to an underground cable connection part protective tube used for protecting a connection part of an underground power cable (hereinafter referred to as an underground cable) in an underground distribution line.

都市中心部などでは、景観の重視その他の理由から配電線路の地中化が進められている。このような地中配電線路では、近年の電力需要の増加などから、高圧電力ケーブルが主に用いられており、亘長が長くなると、当該地中配電線路の中間において、地中ケーブルの端部同士を接続して直線接続部を形成することが行われる。このような直線接続部は、通常、以下の３つの工程を経て形成されるのが一般的である（例えば特許文献１参照）。
（１）接続しようとする地中ケーブルの端部にそれぞれ露出された導体を導体接続管の両側から挿入して、その状態で当該導体接続管を圧縮して導体接続部を形成する。
（２）前記胴体接続部の上に、地中ケーブルの内部半導電性層、絶縁層、外部半導電性層、金属遮蔽層に相当する層を順次形成して絶縁補強体を形成する。
（３）前記絶縁補強体を覆うようにして保護管を設け、該保護管内に防水コンパウンドを充填するとともに、その外側の防水処理を行う。
また、この直線接続部に類似する提案もいくつかなされている（例えば、特許文献２参照）。 In urban centers, distribution lines are being underground for reasons of landscape importance and other reasons. In such underground distribution lines, high-voltage power cables are mainly used due to an increase in power demand in recent years. When the length of the underground distribution line becomes long, the end of the underground cable is in the middle of the underground distribution line. Connecting each other to form a straight connection portion is performed. Such a straight connection portion is generally formed through the following three steps (see, for example, Patent Document 1).
(1) The conductor exposed at the end of the underground cable to be connected is inserted from both sides of the conductor connection tube, and in this state, the conductor connection tube is compressed to form a conductor connection portion.
(2) An insulating reinforcing body is formed by sequentially forming layers corresponding to the inner semiconductive layer, the insulating layer, the outer semiconductive layer, and the metal shielding layer of the underground cable on the body connecting portion.
(3) A protective tube is provided so as to cover the insulation reinforcing body, and the protective tube is filled with a waterproof compound and waterproofed outside thereof.
Some proposals similar to this straight line connecting portion have been made (for example, see Patent Document 2).

実開昭６３−２９３３８号公報Japanese Utility Model Publication No. 63-29338 特開２０００−３５４３２１号公報JP 2000-354321 A

この接続手順で用いられる保護管は、管軸方向に対して直角な方向の接合面によって分割される２つの金属管を当該接合面を合わせて半田付けにより接合される。このような保護管を用いる場合、予め接続しようとする各地中ケーブルに当該各金属管をそれぞれ挿入しておく必要があり、これを怠ると、接続補強部分を保護管で覆うことが不可能となる。また、このような直線接続は、マンホールやハンドホールなどの複数の地中ケーブルが輻輳した狭いスペースで作業を行うことが多く、地中ケーブルに金属管を挿入する際に必要なスペースを確保することが困難な場合がある。   The protective tube used in this connection procedure is joined by soldering two metal tubes that are divided by a joint surface in a direction perpendicular to the tube axis direction. When using such a protective tube, it is necessary to insert each metal tube into the cable to be connected in advance, otherwise it is impossible to cover the connection reinforcement part with the protective tube. Become. In addition, such a straight line connection is often performed in a narrow space where a plurality of underground cables such as manholes and handholes are congested, and a space necessary for inserting a metal pipe into the underground cable is ensured. It can be difficult.

そこで、本発明は、前記課題に鑑み、接続される地中ケーブルの端部にそれぞれ金属管をあらかじめ挿入したり、挿入作業のためにスペースを確保する必要がなく、地中ケーブル導体接続部の絶縁補強体を容易かつ効率的に被覆できる地中ケーブル接続部保護管を提供することを目的とする。   Therefore, in view of the above problems, the present invention eliminates the need to previously insert a metal tube into each end of the underground cable to be connected or to secure a space for the insertion work. It is an object of the present invention to provide an underground cable connection protective tube that can easily and efficiently cover an insulation reinforcement.

前記目的は、本発明によれば、地中電線路の中間における地中ケーブル導体接続部の絶縁補強体を被覆する保護管であって、管軸方向に半割された１対の金属製の半割管体からなり、これらの半割管体は前記方向両側に半田付けにより互いに接合される２つ割り面をそれぞれ備え、前記１対のうちの一方の半割管体の中間部分には、前記２つ割り面の外側端縁に固定されたずれ防止手段が管軸方向に平行に、かつそれぞれの一側縁が突出するように固定され、該ずれ防止手段の突出した部分の対向する内面は他方の半割管体の外周面にそれぞれ当接するように構成されてなることを特徴とする地中ケーブル接続部保護管によって達成される。
The object of the present invention is, according to the present invention, a protective tube for covering the insulation reinforcing body of the underground cable conductor connection part in the middle of the underground cable path, which is made of a pair of metal halves in the tube axis direction. Each of the half pipes includes two split surfaces that are joined to each other by soldering on both sides in the direction , and an intermediate portion of one of the pair of half pipes The deviation preventing means fixed to the outer edge of the two split surfaces are fixed in parallel to the tube axis direction so that one side edge protrudes, and the protruding portions of the deviation preventing means face each other. The inner surface is achieved by an underground cable connection portion protective tube characterized in that the inner surface is configured to abut against the outer peripheral surface of the other half tube body .

本発明によれば、地中ケーブル接続部保護管を管軸方向に半割された１対の金属製の半割管体から構成し、これらの半割管体を組み合わせたときにそれぞれが前記方向両側に備える２つ割り面で互いに接合可能とすることとしたので、従来のような地中ケーブルの端部への保護管の挿入作業のためのスペースを確保する必要がなく、その結果マンホール内などのケーブルが錯綜した狭隘な場所での地中ケーブル接続部の保護が容易となり、作業性も向上する。   According to the present invention, the underground cable connection part protection pipe is constituted by a pair of metal half pipes divided in the pipe axis direction, and when these half pipes are combined, Since the two split surfaces provided on both sides in the direction can be joined to each other, it is not necessary to secure a space for inserting the protective tube into the end of the underground cable as in the conventional case, and as a result, the manhole It is easy to protect underground cable connection parts in confined spaces where cables are complicated, and workability is also improved.

本発明の地中ケーブル接続部保護管の実施形態の一例を示す図である。It is a figure which shows an example of embodiment of the underground cable connection part protective tube of this invention. 本発明の地中ケーブル接続部保護管を用いて形成された直線接続部の一例を示す図である。It is a figure which shows an example of the linear connection part formed using the underground cable connection part protective tube of this invention. 従来の地中ケーブル接続部保護管の一例を示す図である。It is a figure which shows an example of the conventional underground cable connection part protective tube.

以下、添付の図１および図２を参照して、本発明の地中ケーブル接続部保護管の実施形態について詳細に説明する。なお、本発明の地中ケーブル接続部保護管は、以下の実施形態に限定れない。   Hereinafter, with reference to the attached FIG. 1 and FIG. 2, an embodiment of the underground cable connection part protection tube of the present invention will be described in detail. In addition, the underground cable connection part protective tube of this invention is not limited to the following embodiment.

図１は、本発明の地中ケーブル接続部保護管の実施形態の一例を示す図である。この図に示すように、本発明の地中ケーブル接続部保護管１は、２つの金属製半割管体５、６からなる。それぞれの半割管体５、６の管壁は、中央が大径の断面略半円をなし、両端寄りでそれぞれ縮径され、両端部分は中央よりも小径の断面略半円をなしている。管壁をこのような形状とすることで、各半割管体５，６の中間部分に相対的に大径の略半円柱状の空間が形成され、また両端部分には当該空間に連通し、管軸方向両端に向けて開口する相対的に小径の空間が形成されるので、半割管体５，６を組み合わせた管体の内部に地中ケーブル導体接続部の絶縁補強体を納められるようになる。   Drawing 1 is a figure showing an example of an embodiment of a underground cable connection part protection pipe of the present invention. As shown in this figure, the underground cable connection part protective tube 1 of the present invention is composed of two metal half pipes 5 and 6. The tube walls of the respective half pipes 5 and 6 have a substantially semicircular cross section with a large diameter at the center and are reduced in diameter near both ends, and both end portions have a substantially semicircular cross section with a smaller diameter than the center. . By forming the tube wall in such a shape, a relatively large-diameter, substantially semi-cylindrical space is formed in the middle portion of each of the half tubes 5 and 6, and both end portions communicate with the space. Since a relatively small-diameter space that opens toward both ends in the tube axis direction is formed, the insulation reinforcing body of the underground cable conductor connecting portion can be accommodated in the tube body in which the half tubes 5 and 6 are combined. It becomes like this.

半割管体５、６の管壁周方向両端には、２つ割り面７、８がそれぞれ設けられており、これらを互いに対向させて接合することで、１個の管体が形成される。半割管体６の中央の外周には、その両側の端縁に帯状のずれ防止片９、９が管軸方向に平行に、かつそれぞれの一側縁が前記両側の端縁から突出するように固定され、ずれ防止手段として機能するようになっている。なお、ずれ防止手段は、少なくとも一方の半割管体５（または６）の両側縁に配設することができる。ずれ防止手段としては、図１に示すような帯状片に限られず、さらに小型の細片を半割管体の両側縁にそれぞれ１個または複数個取り付けるようにしてもよい。   Two split surfaces 7 and 8 are respectively provided at both ends in the circumferential direction of the pipe wall of the half pipes 5 and 6, and one pipe body is formed by joining them in opposition to each other. . On the outer periphery of the center of the half pipe body 6, strip-shaped displacement preventing pieces 9, 9 are parallel to the pipe axis direction at the edges on both sides, and one side edge of each of the half pipe bodies 6 protrudes from the edges on both sides. And is configured to function as a slip prevention means. Note that the slip prevention means can be disposed on both side edges of at least one half pipe body 5 (or 6). The slip prevention means is not limited to the strip-shaped piece as shown in FIG. 1, and one or more small pieces may be attached to both side edges of the half pipe body.

半割管体５、６を形成する金属材料としては、これらの半割管体５、６を組み合わせることで、地中ケーブルの導体接続部に形成された絶縁補強体をさらに補強できれば、公知の各種金属材料のうちから半田との適合性や加工性などを考慮して適宜選択することができる。なお、半割管体５、６のいずれか一方または双方の管壁には、必要に応じて、適宜の位置に防水コンパウンド注入口、接地端子などを設けることができる。   As a metal material for forming the half pipes 5 and 6, if these insulation pipes 5 and 6 can be combined to further reinforce the insulation reinforcing body formed in the conductor connection portion of the underground cable, Any of various metal materials can be appropriately selected in consideration of compatibility with solder and workability. In addition, a waterproof compound injection port, a grounding terminal, and the like can be provided at appropriate positions on one or both of the pipe walls of the half pipes 5 and 6 as necessary.

次に、本発明の地中ケーブル接続部保護管を用いて形成された直線接続部の一例を示す図２を参照して、本発明の地中ケーブル接続部保護管の使用方法について説明する。なお、この図の直線接続部において、図の上半分は断面図である。   Next, with reference to FIG. 2 which shows an example of the linear connection part formed using the underground cable connection part protection pipe | tube of this invention, the usage method of the underground cable connection part protection pipe | tube of this invention is demonstrated. In the straight line connection portion of this figure, the upper half of the figure is a cross-sectional view.

本発明の地中ケーブル接続部保護管を使用するに当たっては、接続しようとする地中ケーブルの端部に露出した導体を接続し、その上を絶縁補強し、絶縁補強体を形成しておく。ここで、地中ケーブルとしては、架橋ポリエチレン絶縁ビニルシースケーブル（ＣＶケーブル）、単心のＣＶケーブルを３条撚り合わせたトリプレックス型のＣＶケーブル（ＣＶＴケーブル）、油浸紙絶縁ケーブル（ＯＦケーブル）、エチレンプロプレン絶縁ネオプレン防食ケーブル（ＥＰケーブル）などの公知の高圧用または特別高圧用の各種電力ケーブルが挙げられる。なお、図２に示す例では、地中ケーブルＷ１，Ｗ２は、例えば２２ｋＶ特別高圧用のＣＶケーブルであるものとする。   In using the underground cable connection part protective tube of the present invention, an exposed conductor is connected to the end of the underground cable to be connected, and the insulation is reinforced to form an insulation reinforcing body. Here, the underground cable includes a cross-linked polyethylene insulated vinyl sheath cable (CV cable), a triplex type CV cable (CVT cable) in which three single-core CV cables are twisted together, and an oil-impregnated paper insulated cable (OF cable). And various known high-voltage or extra-high-voltage power cables such as ethylene propylene insulated neoprene anticorrosion cable (EP cable). In the example shown in FIG. 2, the underground cables W1 and W2 are assumed to be CV cables for 22 kV extra high voltage, for example.

地中ケーブルＷ１，Ｗ２のそれぞれの端部を段剥きして中心に露出させた導体を導体接続管２０の両端の開口からそれぞれ挿入した後に公知の圧縮工具（不図示）を用いて当該導体接続管２０を圧縮して導体接続部を形成する。そうして、地中ケーブルＷ１，Ｗ２の段剥き部分に当該導体接続部から互いに離隔する方向に順次露出する内部半導電層、絶縁体層、外部半導電層、遮蔽層の間をそれぞれ連続させるように、導体接続部の上に半導電性融着テープ２１、絶縁テープ２２、半導電性融着テープ２４、導電性テープ２５を順次層状に巻き付ける。各テープは、少しずつ重ねるように巻き付けるのがよい。また、特に絶縁テープについては所定の厚さとなるまで巻き付ける。さらにその上に軟銅線などの導電性の線材２６を巻きつけることで、絶縁補強体が形成される。この線材は、絶縁補強体の長さ方向両端において長めに巻き残し部分を設けておく。   After inserting the conductors exposed at the center by stripping the ends of the underground cables W1 and W2 from the openings at both ends of the conductor connection tube 20, the conductors are connected using a known compression tool (not shown). The tube 20 is compressed to form a conductor connection. Then, the inner semiconductive layer, the insulator layer, the outer semiconductive layer, and the shielding layer, which are sequentially exposed in the stepped portions of the underground cables W1 and W2, are separated from the conductor connection portion. As described above, the semiconductive adhesive tape 21, the insulating tape 22, the semiconductive adhesive tape 24, and the conductive tape 25 are sequentially wound in layers on the conductor connection portion. Each tape should be wrapped so that it overlaps little by little. In particular, the insulating tape is wound up to a predetermined thickness. Further, an insulating reinforcing body is formed by winding a conductive wire 26 such as an annealed copper wire thereon. This wire is provided with a longer unwinding portion at both ends in the lengthwise direction of the insulation reinforcing body.

このようにして形成された絶縁補強体の下側に、本発明の地中ケーブル接続部保護管の一方の半割管体５（または６）を配置する。その際、その半割管体の中間部分における大径の開口に当該絶縁補強体が収まるようにする。この場合、半割管体５（または６）をその開口が下向きとなるように絶縁補強体の上側に載せ、その周りを回して配置することができるので、従来のような管体の地中ケーブル端部への挿入のための作業スペースは不要となる。   One half pipe body 5 (or 6) of the underground cable connection part protection pipe of the present invention is disposed below the insulation reinforcing body thus formed. At that time, the insulation reinforcing body is accommodated in the large-diameter opening in the middle portion of the half pipe body. In this case, the half pipe body 5 (or 6) can be placed on the upper side of the insulation reinforcing body so that the opening faces downward, and can be arranged by rotating around the circumference thereof. No work space is required for insertion into the cable end.

次に、絶縁補強体の両側に配置される上向きの２つ割り面７（または８）に、他方の半割管体６（または５）の２つ割り面８（または７）を突き合わせるように、開口を下向きにした当該半割管体を上からかぶせて管状に形成する。その際、いずれか一方の半割管体の中間部分にずれ防止片（図１、符号９参照）を設けておくことにより、２つの半割管体５、６が互いにすれることがない。なお、前記導電性線材の巻き残し部分は、半割管体の長さ方向両側にはみ出すようにする。   Next, the split surface 8 (or 7) of the other half pipe 6 (or 5) is butted against the upward split surface 7 (or 8) arranged on both sides of the insulation reinforcing body. Then, the half pipe with the opening facing downward is covered from above and formed into a tubular shape. At that time, by providing a slip prevention piece (see FIG. 1, reference numeral 9) at an intermediate portion of one of the half pipes, the two half pipes 5 and 6 are not rubbed against each other. The unwinding portion of the conductive wire protrudes to both sides of the half pipe body in the length direction.

その後、２つの半割管体５、６の両側の２つ割り面に沿って半田付けするとともに、保護管１の両側からはみ出させた導電性の線材２６の端部を保護管１の外周に半田付けして固定する。こうして得られる本発明の地中ケーブル接続部保護管１の小径の両端部分を所定の工具を用いて変形させ、その内周が地中ケーブルＷ１、Ｗ２の外周に密着するようにする。そして、保護管１の外面に設けられている防水コンパウンド注入口から防水コンパウンドを注入し、これにより絶縁補強体と保護管１との隙間を充填する。最後に、この保護管１の外周に防水テープ３５を巻き付けてこれを完全に被覆し、防水処理を施す。この防水テープ３５は、絶縁補強体の長さ方向両側では厚く巻き付け、ここから保護管１の内部への水分や湿分の侵入を確実に防止できるようにする。   Thereafter, soldering is performed along the two split surfaces on both sides of the two halved pipe bodies 5 and 6, and the ends of the conductive wire 26 protruding from both sides of the protective tube 1 are placed on the outer periphery of the protective tube 1. Solder and fix. The both ends of the small diameter of the underground cable connection part protective tube 1 of the present invention thus obtained are deformed using a predetermined tool so that the inner periphery thereof is in close contact with the outer periphery of the underground cables W1 and W2. And a waterproof compound is inject | poured from the waterproof compound injection hole provided in the outer surface of the protective tube 1, and the clearance gap between an insulation reinforcement body and the protective tube 1 is filled by this. Finally, a waterproof tape 35 is wound around the outer periphery of the protective tube 1 to completely cover it, and a waterproof treatment is performed. The waterproof tape 35 is wound thickly on both sides of the insulation reinforcing body in the length direction so that moisture and moisture can be reliably prevented from entering the inside of the protective tube 1 from here.

以上説明したように、本発明の地中ケーブル接続部保護管は、その管軸方向に沿った２つ割り面で互いに接合可能な２つの半割管体で構成したので、従来のような地中ケーブルへの保護管挿入作業や、そのための作業スペースの確保が不要となる。その結果、ケーブル類が錯綜する狭隘な場所においても地中ケーブルの接続作業を容易に行うことができ、作業性向上に著しく貢献するものである。また、半割管体にずれ防止手段を設けることで、半田付けにより接合するまでの間、２つの半割管体が互いにずれるのを防止することができる。   As described above, the underground cable connection part protective pipe of the present invention is composed of two halved pipes that can be joined to each other at two split surfaces along the pipe axis direction. It is not necessary to insert a protective tube into the middle cable and to secure a work space for it. As a result, it is possible to easily connect the underground cable even in a narrow place where cables are complicated, which contributes to the improvement of workability. In addition, by providing the half pipe member with a means for preventing displacement, it is possible to prevent the two half pipe members from being displaced from each other until they are joined by soldering.

なお、本発明の地中ケーブル接続部保護管は、前記の直線接続部への使用に限られず、例えば地中ケーブルのＹ分岐接続にも使用できる。この場合、本発明の地中ケーブル接続部保護管は、２つの半割管体を組み合わせた場合に、管軸方向一端の端面には地中ケーブル挿通用の開口が１口形成され、他端の端面には、ケーブル挿通用の開口が２口形成される態様のものを用いるのが好ましい。さらに１本の地中ケーブルから３条以上の複数のケーブルを分岐させる必要がある場合には、本発明の地中ケーブル接続部保護管の他端の端面に分岐させるケーブル条数に相当する口数の開口が形成されるようにすればよい。   In addition, the underground cable connection part protective tube of this invention is not restricted to the use to the said linear connection part, For example, it can be used also for Y branch connection of an underground cable. In this case, in the underground cable connection part protective tube of the present invention, when two halved pipes are combined, one end for insertion of the underground cable is formed on the end surface of one end in the tube axis direction, and the other end It is preferable to use the thing of the aspect by which two openings for cable penetration are formed in the end surface of this. Furthermore, when it is necessary to branch a plurality of three or more cables from one underground cable, the number corresponding to the number of cables to be branched to the end face of the other end of the underground cable connection part protective tube of the present invention The openings may be formed.

本発明の地中ケーブル接続部保護管は、高圧または特別高圧の地中ケーブル接続部を被覆してこれを保護するのに有効である。   The underground cable connection part protective tube of the present invention is effective for covering and protecting a high-voltage or extra-high-voltage underground cable connection part.

１ 地中ケーブル接続部保護管
５，６ 半割管体
５ａ、６ａ、５ｅ、６ｅ 両端部分
５ｂ、６ｂ，５ｄ、６ｄ 縮径部分
５ｃ、６ｃ 中間部分
７，８ ２つ割り面
９ ずれ防止片（手段） DESCRIPTION OF SYMBOLS 1 Underground cable connection part protection tube 5, 6 Half split pipe body 5a, 6a, 5e, 6e Both-ends part 5b, 6b, 5d, 6d Reduced diameter part 5c, 6c Middle part 7, 8 Split surface 9 Slip prevention piece (means)

Claims (3)

地中電線路の中間における地中ケーブル導体接続部の絶縁補強体を被覆する保護管であって、
管軸方向に半割された１対の金属製の半割管体からなり、
これらの半割管体は前記方向両側に半田付けにより互いに接合される２つ割り面をそれぞれ備え、前記１対のうちの一方の半割管体の中間部分には、前記２つ割り面の外側端縁に固定されたずれ防止手段が管軸方向に平行に、かつそれぞれの一側縁が突出するように固定され、該ずれ防止手段の突出した部分の対向する内面は他方の半割管体の外周面にそれぞれ当接するように構成されてなることを特徴とする地中ケーブル接続部保護管。 A protective tube covering the insulation reinforcing body of the underground cable conductor connection part in the middle of the underground cable path,
It consists of a pair of metal halved pipes that are halved in the tube axis direction.
These half tubes are respectively provided with two split surfaces which are joined together by soldering to the both sides, the one on one intermediate portion of the half tube member of the pair is of the two split surfaces The displacement preventing means fixed to the outer edge is fixed in parallel to the tube axis direction so that one side edge protrudes, and the opposing inner surface of the protruding portion of the displacement preventing means is the other half tube An underground cable connection portion protective tube configured to be in contact with the outer peripheral surface of the body . 前記地中ケーブル接続部は直線接続部またはY分岐接続部であり、該ケーブル接続部の種類に応じて前記半割管体は、その管軸方向一端の端面に１口または２口のケーブル挿通用の開口が設けられてなる請求項１に記載の保護管。 The underground cable connection part is a straight connection part or a Y-branch connection part. Depending on the type of the cable connection part, the halved tube is inserted into one end or two ends of the cable in the tube axis direction. The protective tube according to claim 1 , wherein a common opening is provided. 前記地中電線路は特別高圧配電線路である請求項１又は２に記載の保護管。
The protective pipe according to claim 1 or 2 , wherein the underground electric line is a special high-voltage distribution line.
JP2009235694A 2009-10-09 2009-10-09 Underground cable connection protection tube Expired - Fee Related JP5496592B2 (en)

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JPS5939800Y2 (en) * 1980-12-23 1984-11-08 株式会社浅羽製作所 Cable connection point protection box
JPH04188577A (en) * 1990-11-22 1992-07-07 Toshiba Silicone Co Ltd Method of insulating conductor splicing part

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