JP4354055B2 - Overhanging method for overhead ground wire - Google Patents

Overhanging method for overhead ground wire Download PDF

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Publication number
JP4354055B2
JP4354055B2 JP26277899A JP26277899A JP4354055B2 JP 4354055 B2 JP4354055 B2 JP 4354055B2 JP 26277899 A JP26277899 A JP 26277899A JP 26277899 A JP26277899 A JP 26277899A JP 4354055 B2 JP4354055 B2 JP 4354055B2
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ground wire
overhead ground
arm
existing
derrick
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JP2001086613A5 (en
JP2001086613A (en
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幸一 野田
浩太郎 栗崎
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株式会社関電工
株式会社安田製作所
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Description

【0001】
【発明の属する技術分野】
本発明は、鉄塔間で既に張り渡されている既設架空地線を、新設架空地線に張替えるための架空地線の張替え工法に関する。
【0002】
【従来の技術】
光通信技術の普及に伴って、鉄塔間に張り渡される架空地線を光通信に利用しようとする試みがなされている。この場合には、既に張り渡されている既設架空地線を、例えば光ファイバ線を含む架空地線(OPGW)などに張替えることが必要となる。
【0003】
上記の場合などに用いられる架空地線の張替えは一般的に、既設架空地線の鉄塔に対する固定を解除し、この既設架空地線を新設架空地線に置き替えることにより行われている。より詳細に言えば、鉄塔の頂上付近で固定されていた既設架空地線を、固定を解除した上で支持器に移設し、支持器上の既設架空地線を風車搬器などを利用して新設架空地線に置き替えることで、架空地線の張替えを行うというのが通常である。
【0004】
ところが、実際には架空地線の張替えは容易でない。架空地線の張替えを行うには、既設架空地線やこれと置き替えられる新設架空地線が送電線と接触しないように細心の注意を払う必要があり、そのために過大な労力が要求される。
【0005】
両側面に腕金を備えた鉄塔で架空地線の張替えを行う場合には、両側面の腕金から吊り下げられた送電線のうちの一方について電流供給を停止することにより、架空地線の位置制御の困難を緩和する手法が採用されている。しかしながら、鉄塔の中には、腕金の長さが短い狭線間鉄塔と呼ばれるものがあり、このような狭線間鉄塔では、上述の電流供給を停止する手法を用いたとしても、架空地線と送電線との非接触状態を保つのがほとんど不可能となるため、架空地線の張替えが行われていないのが現状である。両側の送電線の双方について電流供給を停止すれば、狭線間鉄塔においても架空地線の張替えを行えるようになるが、これは電力供給の完全な停止を意味するため、現実的な解決手段となり得ない。
【0006】
上述のように、架空地線を張替えるにあたっての困難性は大きく、その困難性故に、架空地線の張替えに要する時間は長くなりがちである。架空地線張替え作業の長期化は、完全な形で電力供給をできない期間の長期化に直結するため、簡単且つ短期間で架空地線張替えを行える技術が望まれている。特に、狭線間鉄塔では、技術的な難易度が高すぎるため、架空地線の張替え自体が行われていない。
【0007】
【発明が解決しようとする課題】
本発明は、簡単且つ短期間で架空地線の張替えを行え、また狭線間鉄塔でも実施可能な架空地線の張替え工法を提供することを課題としている。
【0008】
【課題を解決するための手段】
上記課題を解決するための本発明による架空地線の張替え工法は、両側の腕金で送電線を吊り下げた鉄塔の上部に張渡されている既設架空地線を新設架空地線へ置き替える工程を含む、架空地線の張替え工法をその基本とする。そして、電力供給を停止することで前記送電線の一方側を電流停止線とする工程と、各鉄塔との間の固定を解除した前記既設架空地線を、架空地線張替え区間で前記電流停止線の外側へ張出させる工程と、電流停止線の外側へ張出させた前記既設架空地線を、新設架空地線へ置き替える工程と、を含んでいる。
【0009】
この工法では、各鉄塔との間の固定を解除した既設架空地線を前記電流停止線の外側へ張出させ、電流停止線の外側(この明細書において、『電流停止線の外側』とは、『電流停止線の鉄塔から遠い側』を意味する。)へ張出した状態の既設架空地線を、新設架空地線へ置き替えることとしている。従って、この架空地線の張替え工法によれば、架空地線と電流を停止していない側の送電線との距離が遠く、また電流停止線が架空地線と電流を停止していない側の送電線とが干渉するのを防止する障壁として機能することにより、架空地線の置き換え作業時に、架空地線と電流を停止していない送電線とが接触する可能性を限りなく小さくできる。
【0010】
この架空地線の張替え工法では、上記のように、各鉄塔との間の固定を解除した既設架空地線を電流停止線の外側へ張出させることが必要になる。既設架空地線の電流停止線から外側への張出しは、どのような方法によって行っても良いが、先端部で架空地線を支持可能とされ且つ前記腕金の水平方向の長さよりも長く形成されたアームと、該アームの基端部を回動可能に支持すると共に、鉄塔へ固定できるようにされた固定手段とを備えたデリックを用いて行うことができる。このデリックを、各鉄塔に固定し、各鉄塔との間の固定を解除した前記既設架空地線を先端部で支持させた前記アームを水平方向へ回動させて、前記既設架空地線を前記電流停止線の外側へ張出させることで、架空地線を電流停止線の外側へ容易に張出させるようになる。
【0011】
本発明による既設架空地線の新設架空地線への置き換えは、既存のどのような工法でも用いることができる。例えば、前記電流停止線の外側へ張出させた前記既設架空地線に、懸垂状態で架空地線上を移動するための第1滑車と、他の架空地線を支持するための第2滑車とを備えた風車搬器を、所定の間隔を空けて配置する工程と、該風車搬器の前記第2滑車で案内しながら前記新設架空地線を延線する工程と、延線された前記新設架空地線を張替え区間の両端に位置する鉄塔の前記支持器で支持する工程と、前記各風車搬器を前記新設架空地線に前記第2滑車で懸垂させると共に、該風車搬器の前記第1滑車に既設架空地線を支持させる工程と、前記第1滑車で案内しながら前記既設架空地線を引き抜く工程と、そして、前記各風車搬器を回収するという各工程を行うことにより、既設架空地線の新設架空地線への置き換えを行うことができる。風車搬器は、架空地線上を走行可能であり、且つ架空地線上に障害物があったときには、それを乗り越えることができるものである。従って、既設架空地線をデリックのアームで支持する工法と、風車搬器を用いる工法とは、組み合わせについての相性が特に良い。
【0012】
【発明の実施の形態】
以下、図面を参照して、本発明による架空地線の張替え工法の一実施形態について説明する。
【0013】
この実施形態による架空地線の張替え方法は、図1で示した如き鉄塔10、即ち、その両側に腕金11が3本づつ設けられると共に、各腕金11の先端部で送電線Yを吊り下げ支持した両腕金11タイプの鉄塔10の頂上部で支持されている既設架空地線X1を張替える場合に用いられる。
【0014】
既設架空地線X1の張替えを行うにあたっては、まず、電力供給を停止することで送電線Yの一方側を電流停止線Y1とする。次に、図2に示したように、既設架空地線X1の張替えが行われる張替え区間における各鉄塔10の電流停止線Y1が吊り下げられている側の腕金11の根元部分に、デリック20を固定する。
【0015】
ここで、上記デリック20について説明する。デリック20には、張替え区間の両端部分に位置する鉄塔10に対して取り付けるための端部デリック20aと、張替え区間の両端以外の部分に位置する鉄塔10に対して取り付けるための一般デリック20bとの2種類がある。端部デリック20aの構造は、図3及び図4に示した如きものであり、また一般デリック20bの構造は図5及び図6に示した如きものである。
【0016】
端部デリック20aは、アーム30aと、固定手段としてのベース40aとからなる。アーム30aは、V字型となるようにして組まれた2本のアーム材31aと、このアーム材31aの先端部に取りつけられた接続棒32aと、この接続棒32aに取り付けられた接続板33aと、両アーム材31aの基端部に各々取り付けられた、丸パイプにて形成の回動材34aとを備えている。尚、アーム30aの上面には、チェーン接続用の接続孔35aが設けられた接続片36aが取り付けられている。
【0017】
ベース40aは、上記回動材34aの内面形状に対応するような丸パイプで形成のシャフト41aと、このシャフト41aに固定される、2個で1組とされた2組の位置決め材42a及び固定部43aとからなる。位置決め材42aは、シャフト41aの外周面形状に沿うリング状に形成されており、また位置決め材42aを貫通してシャフト41aに穿設した図示せぬねじ孔に螺合されるボルト44aからなる。
【0018】
この位置決め材42aは、シャフト41aを貫通するボルト44aにより、アーム30aの先端位置がシャフト41aの中心位置に対応するように固定されている。固定部43aは、平行に配置された2本のU字ボルト45a、調節材46a、ナット47a、接続片48a、固定片49a及び固定ボルト50aを備えている。U字ボルト45aは、両端部にねじ切りがされたボルトを、その中央部分で、上記シャフト41aを抱えられる曲率に折り曲げ加工してなる。調節材46aは、U字ボルト45a貫通用の図示せぬ孔を備えており、ナット47aにて上記U字ボルト45aの端部へ固定可能とされている。また、接続片48aは、U字ボルト45a貫通用の図示せぬ2つの孔を備えており、固定部材49aとその一端部で固定されている。尚、図示を省略するが、各U字ボルト45a直線部分の間には、固定部材49aを貫く状態で、補助ボルトが設けられている。また、調節材46aには、これら補助ボルト貫通用の孔が穿設されており、この孔から突出した補助ボルトの先端部に、図示せぬ補助ナットを螺合できるようになっている。これら補助ボルト及び補助ナットは、後述する固定ボルト50aによるアングルAの固定を補助するためのものである。
【0019】
固定部材49aは、断面略コの字型に形成されており、シャフト41aに近い側の固定部材49aには、シャフト41aの外周面に沿う曲面を有し、シャフト41aに当接させることで安定的にシャフト41aを支持する3つの当接材51aが固定されている。固定ボルト50aは、調節材47aに設けた図示せぬ孔を貫通するボルトであり、その一端部に皿状の当接片52aがかしめ止めされている。また、固定ボルト50aの他端部には、螺合用のナット53aが取り付けられており、このナット53aの締め付け量を調節することにより、当接片52aと固定部材49aとの距離を調節できるようになっている。
【0020】
一般デリック20bは、上記端部デリック20aと略同様の構成である。即ち、一般デリック20bは、アーム30bと、固定手段としてのベース40bとからなる。但し、一般デリックのアーム30bは、1本のアーム材31bから構成されている。アーム30bの上面には、チェーン接続用の接続孔35bが設けられた接続片36bが取り付けられている。また、このアーム材31bの先端部には、接続板32bを介してリング33bが取り付けられている。また、一本のみのアーム材31bの基端部には、丸パイプにて形成の回動材34bが取りつけられている。
【0021】
一般デリック20bのベース40bの構造は、端部デリック20aのそれと略同一である。即ち、このベース40bには、端部デリック20aの場合と同様のシャフト41b、位置決め材42b及び固定部43bが含まれている。位置決め材42bは、シャフト41bの外周面形状に沿うリング状に形成されており、また位置決め材42bに穿設した図示せぬねじ孔に螺合されるボルト44bを備えている。一般デリック20bにおける位置決め材42bは、ボルト44bの締め込みによって、シャフト41bの任意個所に固定できるようになっている。従って、所定位置に固定した両位置決め材42bにて回動材34bを挟み込むことで、シャフト41bの長さ方向の任意位置に回動材34bを固定できるようになっている。一般デリック20bの固定部43bは、端部デリック20aの固定部43aと同様となっている。即ち、U字ボルト45b、調節材46b、2つのナット47b、接続片48b、2つの固定部材49b及び固定ボルト50bを備えている。尚、図示を省略するが、U字ボルトの直線部分の間には、補助ボルト及び補助ナットが設けられている。固定部材49bには、当接材51aが固定されており、固定ボルト50bの一端には、皿状の当接片52bが、他端にはナット53bが取り付けられている。
【0022】
そして、デリック20の鉄塔10に対する取り付け方は以下のとおりである。尚、端部デリック20aの取り付け方、一般デリック20bの取り付け方は共通するため、一般デリック20bの取り付け方のみについて説明を行うこととする。鉄塔10に対して一般デリック20bを取りつけるには、まず、ナット47b、53b及び、図示せぬ補助ナットを取り外すことにより、U字ボルト45b、固定ボルト50b及び補助ボルトから調節材46bを取り外す。次に、調節材46bを取り外した部分から鉄塔10を構成する断面L字状のアングルAをU字ボルト45b間の隙間に挿入する。次に、調節材46bをU字ボルト45b及び固定ボルト50bに嵌め、ナット53bを閉めこむことで、固定ボルト50b先端の当接片52bと固定部材49bとの間で、アングルAを挟持する。また、補助ボルト及び補助ナットにより、調節材46bと、固定部材49bとの位置関係を保つ。尚、固定ボルト50bに対するナット53bの締め込みを行うとともに、U字ボルト45bに対するナット47bの締め込み及び図示せぬ補助ボルトに対する図示せぬ補助ナットの締め込みを行い、調節材46bに過度な負荷がかかることを防止するようにする。
【0023】
次に、一般デリック20bにおいては、位置決め材42bを、シャフト41b上の所望の位置にずらし、ボルト44bを締め込むことでシャフト41bに対して固定する。このようにして、回動材34bの位置決めを行う。
【0024】
次に、鉄塔10の頂部付近に固定したウインチUから延びるワイヤWの先端を、レバーホイスト70と接続する。レバーホイスト70は、ホイスト71、レバー72及びチェーン73からなり、ホイスト71にワイヤW1が接続される。チェーン73は、アーム30b先端部の接続孔35bと接続する。このレバー72を握って作業を行うことにより、アーム30bの回動を容易に行えるようになる。
【0025】
次に、各端部デリック20a、一般デリック20bのアーム30a、30bの先端で既設架空地線X1を支持する。支持に先立って、アーム30b先端部に、架空地線を支持可能とした支持器80を金具85を介して取り付けて、この支持器80に既設架空地線X1を支持させることができる。この状態では、アーム30a、30bは略垂直方向となっている。
【0026】
次に、各デリック20のアーム30a、30bを水平方向へ回動させる。これにより既設架空地線X1は、図2に示したように、電流停止線Y1の外側へと張出されることになる。
【0027】
そして、この状態で、既設架空地線X1を、新設架空地線X2へと置き替える。この新設架空地線X2は、OPGWである。
【0028】
既設架空地線X1の新設架空地線X2への置き替え作業は、これに限られないが図7に示したような技術を利用して行うことができる。
【0029】
既設架空地線X1の新設架空地線X2への置き替えを行うにあたっては、まず風車搬器90を展開させる(図7(A))。具体的には、連結ロープWを用いて所定間隔で風車搬器90を一列に連結し、これら風車搬器90を、動力源を内蔵することで架空地線上を自力で走行可能とした自走機91で牽引することにより、所定の間隔を空けて既設架空線X1上に配置する。風車搬器90は、例えば特開昭62−110413号や特開昭62−260507号に示された如き一般的なもので良く、懸垂状態で架空地線上を移動するための第1滑車90Aと、他の架空地線を支持するための第2滑車90Bとを備え、且つ架空地線上に障害物があってもそれを乗り越えられるものであれば良い。
【0030】
次に、新設架空地線X2の延線を行う(図7(B))。具体的には、新設架空地線X2の先端部を先導搬器92及び引き込み搬器93で牽引することで、連続して配置された風車搬器90の第2滑車90Bをガイドとして利用しながら、ドラム架台95から新設架空地線X2を引き出していく。一方、リールワインダ94からは、連結ロープRが引き出され、風車搬器90を繋ぐ連結ロープRの張力を一定に保つ。
【0031】
次に、各鉄塔10に取り付けられたデリック20のアーム30a、30bの先端における既設架空線X1の支持を解除し、アーム30a、30b先端で新設架空地線X2を支持する。これにより、新設架空地線X2と既設架空地線X1の位置関係が逆転し、第2滑車90Bによって新設架空地線X2から懸垂した状態の風車搬器90の第1滑車90Aで、既設架空地線X1が支持された状態となる。そして、この状態から、風車搬器90の第1滑車90Aで案内しつつ、ドラム架台95により既設架空地線X1を抜き取る(図7(C))。また、リールワインダ94によって連結ロープRを巻き取ることで、風車搬器90を回収する(図7(D))。この図7(C)と図7(D)の作業は、同時に行なうことができる。
【0032】
以上により、既設架空地線X1の新設架空地線X2への置き替えを終える。
【0033】
そして、新設架空地線X2を支持しているデリック20のアーム30a、30bを垂直方向に回動させ、鉄塔10の既設架空地線が固定されていた部分に新設架空地線X2を固定することで、架空地線の張替えが終了する。
【0034】
【発明の効果】
本発明の架空地線の張替え工法では、既設架空地線の新設架空地線への置き替え作業を、電流停止線の外側に既設架空地線を張出させてから行うようにしているので、上記置き替え作業を行うにあたって、架空地線が電流を停止していない送電線と接触することがない。従って、架空地線の張替えを行うにあたっての作業上の困難が少なくなり、工期短縮が可能となる。また、この架空地線の張替え工法において、デリックを用いれば、既設架空地線を電流停止線の外側へ容易に張出させることができるようになる。
【図面の簡単な説明】
【図1】本発明の一実施形態による架空地線の張替え工法が実施される鉄塔の構造を簡略化して示す図。
【図2】本発明の一実施形態による架空地線の張替え工法の説明を概略的に示す図。
【図3】本発明の一実施形態による架空地線の張替え工法で用いる端部デリックの構造を示す平面図。
【図4】本発明の一実施形態による架空地線の張替え工法で用いる端部デリックの構造を示す側面図。
【図5】本発明の一実施形態による架空地線の張替え工法で用いる一般デリックの構造を示す底面図。
【図6】本発明の一実施形態による架空地線の張替え工法で用いる一般デリックの構造を示す側面図。
【図7】本発明の一実施形態による架空地線の張替え工法で、既設架空地線を新設架空地線に置き替える工程の一例を示す図。
【符号の説明】
10 鉄塔
11 腕金
20 デリック
30a、30b アーム
40a、40b ベース(固定手段)
70 レバーホイスト
90 風車搬器
[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for replacing an overhead ground wire for replacing an existing overhead ground wire already stretched between steel towers with a new overhead ground wire.
[0002]
[Prior art]
With the spread of optical communication technology, an attempt has been made to use an overhead ground wire stretched between steel towers for optical communication. In this case, it is necessary to replace the already installed overhead ground wire with an overhead ground wire (OPGW) including an optical fiber line, for example.
[0003]
The overhead ground wire used in the above case is generally replaced by releasing the fixing of the existing overhead ground wire to the steel tower and replacing the existing overhead ground wire with the new overhead ground wire. More specifically, the existing overhead ground wire that was fixed near the top of the tower was released and transferred to the supporter, and the existing overhead ground wire on the supporter was newly installed using a windmill carrier, etc. It is normal to replace the overhead ground wire by replacing it with an overhead ground wire.
[0004]
However, in reality, it is not easy to replace the overhead ground wire. In order to replace the overhead ground wire, it is necessary to pay close attention not to contact the existing overhead ground wire or the newly installed overhead ground wire with the power transmission line, which requires excessive labor. .
[0005]
When the overhead ground wire is replaced by a steel tower with armrests on both sides, the current supply to one of the transmission lines suspended from the armrests on both sides is stopped to A technique that alleviates the difficulty of position control is adopted. However, some steel towers are called narrow-line steel towers with short arm lengths. In such a narrow-line steel tower, even if the above-described method for stopping the current supply is used, the overhead ground Since it is almost impossible to maintain a non-contact state between the power line and the power transmission line, the overhead ground wire has not been replaced. If current supply is stopped for both transmission lines on both sides, it will be possible to replace the overhead ground wire even in the narrow towers, but this means a complete stop of the power supply, so a realistic solution It cannot be.
[0006]
As described above, the difficulty in changing the overhead ground wire is great, and the time required for the replacement of the overhead ground wire tends to be long due to the difficulty. Since the extension of the overhead ground wire replacement work directly leads to the extension of the period during which power cannot be supplied in a complete form, a technique capable of easily and quickly changing the overhead ground wire is desired. In particular, in the steel tower between narrow lines, since the technical difficulty is too high, the overhead ground wire itself is not replaced.
[0007]
[Problems to be solved by the invention]
It is an object of the present invention to provide an overhead ground wire replacement method that can be easily and quickly replaced in an overhead ground wire and that can be carried out on a steel tower between narrow wires.
[0008]
[Means for Solving the Problems]
The overhead ground wire replacement method according to the present invention for solving the above problem replaces an existing overhead ground wire that is stretched over the top of a steel tower with a transmission line suspended by a metal arm on both sides with a new overhead ground wire. The basic method is a method of replacing the overhead ground wire, including the process. Then, by stopping the power supply, the step of setting one side of the transmission line as a current stop line, and the existing overhead ground line that has been unfixed between the towers is stopped in the overhead ground line replacement section. A step of projecting to the outside of the wire, and a step of replacing the existing overhead ground wire that is projected to the outside of the current stop line with a new overhead ground wire.
[0009]
In this construction method, an existing overhead ground wire that has been fixed between each tower is extended to the outside of the current stop line, and the outside of the current stop line (in this specification, “outside of the current stop line” is ”Means the side of the current stop line far from the steel tower.) The existing overhead ground wire overhanging to the new overhead ground wire will be replaced. Therefore, according to the method of replacing the overhead ground wire, the distance between the overhead ground wire and the transmission line on the side where the current is not stopped is long, and the current stop line is located on the side where the current is not stopped. By functioning as a barrier that prevents interference with the power transmission line, the possibility of contact between the overhead ground wire and the power transmission line that has not stopped the current can be reduced as much as possible when the overhead ground wire is replaced.
[0010]
As described above, this overhead ground wire extension method requires that the existing overhead ground wire, which has been unfixed between the towers, be extended to the outside of the current stop line. The extension of the existing ground wire from the current stop line to the outside may be performed by any method, but the overhead wire can be supported at the tip and formed longer than the horizontal length of the armrest. This can be carried out using a derrick provided with an arm and a fixing means that supports the base end portion of the arm so as to be rotatable and can be fixed to a steel tower. The derrick is fixed to each steel tower, and the arm that supports the existing overhead ground wire that has been fixed between the steel towers at the tip is rotated in the horizontal direction, and the existing overhead ground wire is By projecting outside the current stop line, the overhead ground wire can be easily projected outside the current stop line.
[0011]
Any existing construction method can be used to replace an existing overhead ground wire with a new overhead ground wire according to the present invention. For example, a first pulley for moving on the overhead ground wire in a suspended state on the existing overhead ground wire extending outside the current stop line, and a second pulley for supporting another overhead ground wire, A step of disposing a wind turbine carrier provided with a predetermined interval, a step of extending the new overhead ground wire while being guided by the second pulley of the wind turbine carrier, and the extended new overhead ground A step of supporting the wire with the supporters of the steel towers located at both ends of the re-covering section, and suspending each windmill carrier on the newly installed overhead ground wire with the second pulley, and existing on the first pulley of the windmill carrier A new installation of the existing overhead ground wire is performed by performing a step of supporting the overhead ground wire, a step of pulling out the existing overhead ground wire while being guided by the first pulley, and a step of collecting each windmill carrier. Replacement to an imaginary ground wire can be performed. The windmill carrier can travel on the overhead ground wire, and can get over the obstacle when there is an obstacle on the overhead ground wire. Therefore, the method of supporting the existing overhead ground wire with the derrick arm and the method of using the windmill carrier are particularly compatible with each other.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, with reference to the drawings, an embodiment of an overhead ground wire replacement method according to the present invention will be described.
[0013]
The overhead ground wire replacement method according to this embodiment is a tower 10 as shown in FIG. 1, that is, three armatures 11 are provided on both sides of the tower 10, and the transmission line Y is suspended at the tip of each armrest 11. It is used when the existing overhead ground wire X1 supported at the top of the 11-type steel tower 10 supported by the lowering is replaced.
[0014]
In performing the replacement of the existing aerial ground wire X1, first, one side of the transmission line Y is set as the current stop line Y1 by stopping the power supply. Next, as shown in FIG. 2, the derrick 20 is attached to the base portion of the arm metal 11 on the side where the current stop line Y1 of each steel tower 10 is suspended in the replacement section where the existing overhead ground wire X1 is replaced. To fix.
[0015]
Here, the derrick 20 will be described. The derrick 20 includes an end derrick 20a for attaching to the steel tower 10 located at both ends of the re-covering section, and a general derrick 20b for attaching to the steel tower 10 located at parts other than both ends of the re-covering section. There are two types. The structure of the end derrick 20a is as shown in FIGS. 3 and 4, and the structure of the general derrick 20b is as shown in FIGS.
[0016]
The end derrick 20a includes an arm 30a and a base 40a as a fixing means. The arm 30a includes two arm members 31a assembled so as to be V-shaped, a connecting rod 32a attached to the tip of the arm member 31a, and a connecting plate 33a attached to the connecting rod 32a. And a rotating member 34a formed by a round pipe, each attached to the base end of both arm members 31a. A connection piece 36a provided with a connection hole 35a for chain connection is attached to the upper surface of the arm 30a.
[0017]
The base 40a includes a shaft 41a formed of a round pipe corresponding to the inner surface shape of the rotating member 34a, two sets of positioning members 42a fixed to the shaft 41a, and two fixed members 42a. Part 43a. The positioning member 42a is formed in a ring shape that follows the shape of the outer peripheral surface of the shaft 41a, and includes a bolt 44a that passes through the positioning member 42a and is screwed into a screw hole (not shown) formed in the shaft 41a.
[0018]
The positioning member 42a is fixed by a bolt 44a penetrating the shaft 41a so that the tip position of the arm 30a corresponds to the center position of the shaft 41a. The fixing portion 43a includes two U-shaped bolts 45a, an adjusting member 46a, a nut 47a, a connecting piece 48a, a fixing piece 49a, and a fixing bolt 50a arranged in parallel. The U-shaped bolt 45a is formed by bending a bolt threaded at both ends into a curvature that can hold the shaft 41a at the center. The adjusting member 46a has a hole (not shown) for penetrating the U-shaped bolt 45a, and can be fixed to the end of the U-shaped bolt 45a by a nut 47a. Further, the connecting piece 48a includes two holes (not shown) for penetrating the U-shaped bolt 45a, and is fixed at the fixing member 49a and one end thereof. In addition, although illustration is abbreviate | omitted, the auxiliary | assistant bolt is provided in the state which penetrates the fixing member 49a between each U-shaped volt | bolt 45a linear part. The adjusting member 46a is provided with holes for penetrating the auxiliary bolts, and an auxiliary nut (not shown) can be screwed onto the tip of the auxiliary bolt protruding from the hole. These auxiliary bolts and auxiliary nuts are for assisting in fixing the angle A by a fixing bolt 50a described later.
[0019]
The fixing member 49a has a substantially U-shaped cross section. The fixing member 49a on the side close to the shaft 41a has a curved surface along the outer peripheral surface of the shaft 41a, and is stable by being brought into contact with the shaft 41a. In particular, three contact members 51a that support the shaft 41a are fixed. The fixing bolt 50a is a bolt that passes through a hole (not shown) provided in the adjusting member 47a, and a dish-like contact piece 52a is caulked to one end thereof. Further, a screw nut 53a is attached to the other end of the fixing bolt 50a, and the distance between the contact piece 52a and the fixing member 49a can be adjusted by adjusting the tightening amount of the nut 53a. It has become.
[0020]
The general derrick 20b has substantially the same configuration as the end derrick 20a. That is, the general derrick 20b includes an arm 30b and a base 40b as fixing means. However, the general derrick arm 30b is composed of one arm member 31b. A connection piece 36b provided with a connection hole 35b for chain connection is attached to the upper surface of the arm 30b. A ring 33b is attached to the tip of the arm member 31b via a connection plate 32b. Further, a rotating member 34b formed by a round pipe is attached to the base end portion of only one arm member 31b.
[0021]
The structure of the base 40b of the general derrick 20b is substantially the same as that of the end derrick 20a. That is, the base 40b includes a shaft 41b, a positioning member 42b, and a fixing portion 43b similar to the case of the end derrick 20a. The positioning member 42b is formed in a ring shape along the outer peripheral surface of the shaft 41b, and includes a bolt 44b that is screwed into a screw hole (not shown) formed in the positioning member 42b. The positioning member 42b in the general derrick 20b can be fixed to an arbitrary portion of the shaft 41b by tightening the bolt 44b. Therefore, the rotating member 34b can be fixed at an arbitrary position in the length direction of the shaft 41b by sandwiching the rotating member 34b between the positioning members 42b fixed at predetermined positions. The fixed portion 43b of the general derrick 20b is the same as the fixed portion 43a of the end derrick 20a. That is, a U-shaped bolt 45b, an adjusting member 46b, two nuts 47b, a connecting piece 48b, two fixing members 49b, and a fixing bolt 50b are provided. In addition, although illustration is abbreviate | omitted, the auxiliary | assistant bolt and the auxiliary | assistant nut are provided between the linear parts of a U-shaped volt | bolt. A contact member 51a is fixed to the fixing member 49b, a dish-shaped contact piece 52b is attached to one end of the fixing bolt 50b, and a nut 53b is attached to the other end.
[0022]
And how to attach derrick 20 to steel tower 10 is as follows. Since the end derrick 20a and the general derrick 20b are attached in common, only the general derrick 20b will be described. In order to attach the general derrick 20b to the steel tower 10, first, the adjusting members 46b are removed from the U-shaped bolts 45b, the fixing bolts 50b, and the auxiliary bolts by removing the nuts 47b and 53b and the auxiliary nuts (not shown). Next, an angle A having an L-shaped cross section constituting the steel tower 10 is inserted into the gap between the U-shaped bolts 45b from the portion from which the adjusting member 46b has been removed. Next, the adjusting member 46b is fitted to the U-shaped bolt 45b and the fixing bolt 50b, and the nut 53b is closed, whereby the angle A is sandwiched between the contact piece 52b at the tip of the fixing bolt 50b and the fixing member 49b. Further, the positional relationship between the adjusting member 46b and the fixing member 49b is maintained by the auxiliary bolt and the auxiliary nut. In addition, the nut 53b is tightened with respect to the fixing bolt 50b, the nut 47b is tightened with respect to the U-shaped bolt 45b, and an auxiliary nut (not illustrated) is tightened with respect to the unillustrated auxiliary bolt, and an excessive load is applied to the adjusting member 46b. Try to prevent that.
[0023]
Next, in the general derrick 20b, the positioning member 42b is shifted to a desired position on the shaft 41b, and is fixed to the shaft 41b by tightening the bolt 44b. In this way, the rotating member 34b is positioned.
[0024]
Next, the tip of the wire W extending from the winch U fixed near the top of the steel tower 10 is connected to the lever hoist 70. The lever hoist 70 includes a hoist 71, a lever 72, and a chain 73, and a wire W <b> 1 is connected to the hoist 71. The chain 73 is connected to the connection hole 35b at the tip of the arm 30b. By holding the lever 72 and performing the operation, the arm 30b can be easily rotated.
[0025]
Next, the existing overhead ground wire X1 is supported by the ends of the arms 30a and 30b of each end derrick 20a and general derrick 20b. Prior to support, a support device 80 capable of supporting an aerial ground wire is attached to the tip of the arm 30b via a metal fitting 85, and the existing aerial ground wire X1 can be supported by the support device 80. In this state, the arms 30a and 30b are in a substantially vertical direction.
[0026]
Next, the arms 30a and 30b of each derrick 20 are rotated in the horizontal direction. As a result, the existing overhead ground wire X1 is projected outside the current stop line Y1 as shown in FIG.
[0027]
In this state, the existing overhead ground wire X1 is replaced with the new overhead ground wire X2. This newly installed overhead ground wire X2 is OPGW.
[0028]
The replacement work of the existing overhead ground wire X1 to the new overhead ground wire X2 is not limited to this, but can be performed using the technique shown in FIG.
[0029]
When replacing the existing aerial ground wire X1 with the new aerial ground wire X2, the wind turbine carrier 90 is first deployed (FIG. 7A). Specifically, the wind turbine carriers 90 are connected in a row at predetermined intervals using the connecting rope W, and the wind turbine carriers 90 are capable of traveling on an imaginary ground wire by themselves by incorporating a power source. By pulling with, it arrange | positions on the existing overhead line X1 at predetermined intervals. The windmill carrier 90 may be a general one as shown in, for example, Japanese Patent Laid-Open Nos. 62-110413 and 62-260507, and a first pulley 90A for moving on an overhead ground wire in a suspended state, The second pulley 90B for supporting another overhead ground line and any obstacle on the overhead ground line may be used.
[0030]
Next, the newly installed overhead ground wire X2 is extended (FIG. 7B). Specifically, the front end of the newly installed overhead ground wire X2 is pulled by the leading device 92 and the retracting device 93, and the second pulley 90B of the continuously arranged windmill device 90 is used as a guide while the drum frame is used. The new aerial ground wire X2 is drawn from 95. On the other hand, the connecting rope R is pulled out from the reel winder 94, and the tension of the connecting rope R connecting the windmill transporter 90 is kept constant.
[0031]
Next, the support of the existing overhead wire X1 at the tips of the arms 30a, 30b of the derrick 20 attached to each steel tower 10 is released, and the new overhead wire X2 is supported at the tips of the arms 30a, 30b. As a result, the positional relationship between the new overhead ground line X2 and the existing overhead ground line X1 is reversed, and the existing overhead ground line of the first pulley 90A of the windmill transporter 90 is suspended from the new overhead ground line X2 by the second pulley 90B. X1 is in a supported state. Then, from this state, the existing overhead ground wire X1 is pulled out by the drum mount 95 while being guided by the first pulley 90A of the windmill transporter 90 (FIG. 7C). Further, the wind turbine carrier 90 is recovered by winding the connecting rope R with the reel winder 94 (FIG. 7D). The operations shown in FIGS. 7C and 7D can be performed simultaneously.
[0032]
Thus, the replacement of the existing overhead ground wire X1 with the new overhead ground wire X2 is completed.
[0033]
Then, the arms 30a and 30b of the derrick 20 supporting the newly installed overhead ground wire X2 are rotated in the vertical direction, and the newly installed overhead ground wire X2 is fixed to the portion of the tower 10 where the existing overhead ground wire is fixed. This completes the replacement of the overhead ground wire.
[0034]
【The invention's effect】
In the construction method of the overhead ground wire of the present invention, the replacement work of the existing overhead ground wire to the new overhead ground wire is performed after the existing overhead ground wire is extended outside the current stop line. In performing the replacement work, the overhead ground wire does not come into contact with the transmission line that has not stopped the current. Therefore, the difficulty in work in changing the overhead ground wire is reduced, and the construction period can be shortened. In addition, if a derrick is used in this overhead ground wire replacement method, the existing overhead ground wire can be easily extended to the outside of the current stop line.
[Brief description of the drawings]
FIG. 1 is a diagram showing a simplified structure of a steel tower in which an overhead ground wire replacement method according to an embodiment of the present invention is implemented.
FIG. 2 is a diagram schematically showing an explanation of an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 3 is a plan view showing a structure of an end derrick used in an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 4 is a side view showing a structure of an end derrick used in an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 5 is a bottom view showing a structure of a general derrick used in an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 6 is a side view showing a structure of a general derrick used in an overhead ground wire replacement method according to an embodiment of the present invention.
FIG. 7 is a diagram showing an example of a process of replacing an existing overhead ground wire with a new overhead ground wire by the overhead ground wire replacement method according to one embodiment of the present invention.
[Explanation of symbols]
10 steel tower 11 arm metal 20 derrick 30a, 30b arm 40a, 40b base (fixing means)
70 lever hoist 90 windmill carrier

Claims (1)

両側の腕金で送電線を吊り下げた狭線間鉄塔である鉄塔の上部に張渡されている既設架空地線を新設架空地線へ置き替える工程を含む、架空地線の張替え工法であって、
電力供給を停止することで前記送電線の一方側を電流停止線とする工程と、
各鉄塔との間の固定を解除した前記既設架空地線を、架空地線張替え区間で前記電流停止線の外側へ張出させる工程と、
電流停止線の外側へ張出させた前記既設架空地線を、新設架空地線へ置き替える工程と、
を含む架空地線の張替え工法であって、
各鉄塔との間の固定を解除した前記既設架空地線を、架空地線張替え区間で前記電流停止線の外側へ張出させる前記工程は、
先端部で架空地線を支持可能とされ且つ前記腕金の水平方向の長さよりも長く形成されているとともに、略垂直な位置と略水平な位置の間で回動可能とされており、且つ略水平な状態で平面視したときの形状が基端側が広がる略V字状に構成のV字アームと、該V字アームの基端部を回動可能に支持すると共に、鉄塔へ固定できるようにされた固定手段と、を備えた端部デリックを、架空地線張替え区間の両端に位置する鉄塔に固定するとともに、先端部で架空地線を支持可能とされ且つ前記腕金の水平方向の長さよりも長く形成されているとともに、略垂直な位置と略水平な位置の間で回動可能とされており、且つ略水平な状態で平面視したときの形状が略直線状に構成の直線アームと、該直線アームの基端部を回動可能に支持すると共に、鉄塔へ固定できるようにされた固定手段と、を備えた一般デリックを、架空地線張替え区間の両端に位置するもの以外の鉄塔に固定する工程と、
各鉄塔との間の固定を解除した前記既設架空地線を、そのいずれもが略垂直な位置に位置させられた前記端部デリックの前記V字アームの先端部と、前記一般デリックの前記直線アームの先端部とで支持させるとともに、そのいずれもが前記架空地線をその先端で支持した前記V字アームと、前記直線アームとを、レバーホイストを用いて、略水平な位置まで回動させることで、前記既設架空地線を前記電流停止線の外側へ張出させる工程と、
を含
電流停止線の外側へ張出させた前記既設架空地線を、新設架空地線へ置き替える前記工程は、
前記電流停止線の外側へ張出させた前記既設架空地線に、懸垂状態で架空地線上を移動するための第1滑車と、他の架空地線を支持するための第2滑車とを備えた風車搬器を、所定の間隔を空けて配置する工程と、
該風車搬器の前記第2滑車で案内しながら前記新設架空地線を延線する工程と、
延線された前記新設架空地線を架空地線張替え区間の両端に位置する鉄塔に固定の前記端部デリックの前記V字アームの前記先端部で支持する工程と、
前記各風車搬器を前記新設架空地線に前記第2滑車で懸垂させると共に、該風車搬器の前記第1滑車に既設架空地線を支持させる工程と、
前記第1滑車で案内しながら前記既設架空地線を引き抜く工程と、
前記各風車搬器を回収する工程と、
を含む、
架空地線の張替え工法。
This is an overhead ground wire replacement method that includes the process of replacing an existing overhead ground wire that is stretched over the steel tower, which is a steel tower between two narrow lines, with suspension wires on both sides. And
A step of making one side of the transmission line a current stop line by stopping power supply; and
Extending the existing overhead ground wire that has been fixed between each steel tower to the outside of the current stop line in the overhead ground wire replacement section; and
Replacing the existing overhead ground wire extending outside the current stop line with a new overhead ground wire;
A method of redrawing an imaginary ground wire including
The step of extending the existing overhead ground wire, which has been fixed between each tower, to the outside of the current stop line in the overhead ground wire replacement section,
An aerial ground wire can be supported at the tip and formed longer than the horizontal length of the arm metal, and is rotatable between a substantially vertical position and a substantially horizontal position; and A V-shaped arm configured to have a substantially V shape whose base end side is widened when viewed in plan in a substantially horizontal state , and a base end portion of the V-shaped arm are rotatably supported and fixed to a steel tower. And fixing the end derricks to the steel towers located at both ends of the overhead ground wire replacement section, and supporting the overhead ground wire at the distal end and in the horizontal direction of the arm metal A straight line that is formed longer than the length, is rotatable between a substantially vertical position and a substantially horizontal position, and has a substantially straight shape when viewed in plan in a substantially horizontal state. The arm and the base end of the linear arm are supported rotatably. A fixing means which is to be fixed to the pylon, the general derrick provided with a step of fixing the tower other than those positioned at both ends of the ground wire replacement interval,
The existing aerial ground wire that has been unfixed between the steel towers, the tip of the V-shaped arm of the end derrick, each of which is positioned at a substantially vertical position, and the straight line of the general derrick The arm is supported by the tip of the arm, and both of which rotate the V-shaped arm that supports the overhead ground wire at the tip and the linear arm to a substantially horizontal position using a lever hoist . By extending the existing overhead ground wire to the outside of the current stop line,
Only including,
The step of replacing the existing overhead ground wire extended outside the current stop line with a new overhead ground wire,
A first pulley for moving on the overhead ground wire in a suspended state and a second pulley for supporting another overhead ground wire are provided on the existing overhead ground wire that extends outside the current stop line. Arranging the windmill transporter at a predetermined interval;
Extending the newly installed ground wire while guiding with the second pulley of the windmill carrier;
Supporting the extended overhead ground wire extended at the tip of the V-shaped arm of the end derrick fixed to a steel tower located at both ends of the overhead ground wire re-spanning section;
Suspending each windmill transporter on the newly installed overhead ground line with the second pulley and supporting the existing overhead groundline on the first pulley of the windmill transporter;
Pulling out the existing overhead ground wire while guiding with the first pulley;
Recovering each windmill transporter;
including,
Overhanging method for overhead ground wire.
JP26277899A 1999-09-16 1999-09-16 Overhanging method for overhead ground wire Expired - Fee Related JP4354055B2 (en)

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JP2007336696A (en) * 2006-06-15 2007-12-27 Tokyo Electric Power Co Inc:The Overhead earth-wire replacing method by slinger method making use of cable in stop state
JP5730674B2 (en) * 2011-06-01 2015-06-10 中国電力株式会社 Steel tower maintenance work
CN109193448A (en) * 2018-08-14 2019-01-11 国网辽宁省电力有限公司辽阳供电公司 A kind of installation tool and installation method promoting aerial earth wire
CN110837672B (en) * 2019-11-15 2022-07-19 国网湖南省电力有限公司 Design method of power transmission line iron tower without ground wire

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