JP4068011B2

JP4068011B2 - Steel tower rebuilding method

Info

Publication number: JP4068011B2
Application number: JP2003149296A
Authority: JP
Inventors: 了田岡; 良介高木
Original assignee: Tokyo Electric Power Co Inc
Current assignee: Tokyo Electric Power Co Inc
Priority date: 2003-05-27
Filing date: 2003-05-27
Publication date: 2008-03-26
Anticipated expiration: 2023-05-27
Also published as: JP2004357359A

Description

【０００１】
【発明の属する技術分野】
本発明は、鉄塔建て替え工法に関し、特に、送電線等の架空線をＶ吊り形態で架線する懸垂碍子装置を用いた既設鉄塔の建て替え工法として好適な技術に関する。
【０００２】
【従来の技術】
送電線鉄塔の建て替え工法として、従来から、図１４に示すような工法が広く採用されていた。この工法は、系統運用上、１回線停止条件の場合に、１回線仮設工事（仮設鉄塔の建築）を実施して建て替える方法である。
【０００３】
即ち、図１４に示すように、鉄塔１、２間の既設鉄塔３を建て替える際に、同図（ａ）〜（ｄ）の手順を行う。
【０００４】
まず、図１４（ａ）に示すように、他側送電線５に通電し、一側送電線４を断電した状態で、一側送電線４及び他側送電線５の線間方向において既設鉄塔３から充分に離れた位置に仮設鉄塔６を建築し、その仮設鉄塔６のアームに仮送電線７を架線する。
【０００５】
次に、図１４（ｂ）に示すように、既設鉄塔３から一側送電線４を切り離し、仮送電線７に通電し、他側送電線５を断電した状態で、既設鉄塔３を撤去する。
【０００６】
次に、図１４（ｃ）に示すように、鉄塔１、２間の目的の位置に新設鉄塔８を建築し、その新設鉄塔８のアームに他側送電線５を架線する。
【０００７】
次に、図１４（ｄ）に示すように、他側送電線５に通電し、一側送電線４を断電した状態で、その一側送電線４を仮設鉄塔６から新設鉄塔８へ移設した後、一側送電線４にも通電する。
【０００８】
この鉄塔建て替え工法では、仮設鉄塔６および仮送電線７等の仮設工事を必要とする。そのため、施工費が嵩む問題、仮設鉄塔建築用地を確保し難い問題等があった。
【０００９】
そこで、最近の１回線交互停止による鉄塔建て替え工法として、２脚１／２面包み込み工法（特許文献１参照）、ケーブルジャンパー工法（特許文献２、図１３等参照）、長大ジャンパーによる仮設工事の簡略化工法（図１４参照）などが開発されている。
【００１０】
図１５に示すケーブルジャンパー工法は、鉄塔１、２間の既設鉄塔３を新設鉄塔８に建て替える際に、その建て替え工事に必要な区間の送電線５に代わるケーブルジャンパー線（絶縁被覆電線）９ａを平行に設けることで、建て替え工事区間の送電線（裸線）５を断電し、電気的安全性を図る工法である。
【００１１】
図１６に示す長大ジャンパー工法は、鉄塔１、２間の既設鉄塔３を新設鉄塔８に建て替える際に、鉄塔敷地の外に仮の支持柱１ａ、１ｂを建て、これらの支持柱１ａ、１ｂを利用して、鉄塔建て替え工事に必要な区間の送電線５よりも外側に大きく迂回する仮送電線９ｂを設けることで、建て替え工事区間の電気的安全性を図る工法である。
【００１２】
【特許文献１】
特開２０００−３４５７４０号公報
【特許文献２】
特開２０００−２７０４５４号公報
【００１３】
【発明が解決しようとする課題】
しかしながら、このような１回線交互停止による鉄塔建て替え工法では、以下のような点で解決すべき課題がある。
（１）２脚１／２面包み込み工法では、既設鉄塔に強度を負担させているものの、既設鉄塔強度の裕度は少ないという問題がある。したがって、台風、強風が予想される時期は採用できない。この問題は嵩上げ工法でも同様である。
（２）ケーブルジャンパー工法は、超高圧送電線には設備容量的に採用できない。
（３）長大ジャンパー工法は簡易な支持柱が必要で、超高圧送電線ではジャンパーからのクリアランスが大きく、支持柱が過大となる。
【００１４】
よって、本発明の課題は、１回線交互停止による鉄塔建て替えが可能で、充分な離隔距離の確保により電気的安全性を確保でき、しかも仮設物や特別なスペースが不要で、施工性並びに経済性に優れた鉄塔建て替え工法を提供することにある。
【００１５】
【課題を解決するための手段】
前記課題を解決するため、本発明では以下の手段を採用した。
本発明は、既設鉄塔の一側及び他側に延びる一側既設アーム及び他側既設アームを有し、それら一側既設アーム及び他側既設アームに、Ｖ吊り形態となる懸垂碍子装置を介して一側架空線及び他側架空線がそれぞれ架線された鉄塔の建て替え工法であって、
前記一側架空線に通電し、他側架空線を断電した状態で、その他側架空線を他側既設アームの先端側へＩ吊り形態架空線として移動させる第１工程と、
他側架空線に通電し、一側架空線を断電した状態で、既設鉄塔間に新設鉄塔の塔体と、一側既設アームに対応する一側新設アームとを建築する第２工程と、
一側架空線を一側新設アームの先端側にＩ吊り形態架空線として移設する第３工程と、
一側架空線に通電し、他側架空線を断電した状態で、新設鉄塔に他側既設アームに対応する他側新設アームを建築する第４工程と、
他側新設アームに懸垂碍子装置を介して他側架空線をＶ吊り形態架空線として移設する第５工程と、
他側架空線に通電し、一側架空線を断電した状態で、その一側架空線を懸垂碍子装置を介してＶ吊り形態架空線として架線する第６工程と、を含むことを特徴とする。
【００１６】
本発明によれば、既設鉄塔と新設鉄塔のＶ吊り形態架空線を左右交互にＩ吊り形態としながら、新設鉄塔建築に必要な作業空間を確保しつつ、新設鉄塔に順次移設する工法を採用している。これは、通電側架空線（充電部）との離隔距離（電気的安全距離）を確保する方法として、架空線をＶ吊り形態とする懸垂碍子装置が碍子の片寄りを考慮した鉄塔設計となっていることに着目したものである。
【００１７】
即ち、Ｖ吊り懸垂碍子をＩ吊り懸垂碍子に変更して鉄塔アームの先端側へ架空線を移動させても、鉄塔強度は問題なく、新設・既設鉄塔の塔体との離隔距離を増やすことができるからである。これにより、１回線交互停止による鉄塔建て替えが可能で、電気的安全性を確保でき、しかも仮設物や特別なスペースが不要で、施工性並びに経済性に優れた鉄塔建て替え工法とすることができる。この工法では、既設鉄塔の近くに新設鉄塔を建築する建て替え工法として好適である。
【００１８】
本発明では、前記一側架空線及び他側架空線がそれぞれ複数ある場合、それら一側架空線群及び他側架空線群ごとに前記各工程を行うことが望ましい。片側の架空線群ごとに分けて作業を進めることで、その作業性及び安全性の向上を図ることができるからである。
【００１９】
前記第３工程において、既設鉄塔の各一側既設アームを撤去し、前記第５工程において、既設鉄塔の各他側既設アーム及び塔体の少なくとも一部を撤去することが望ましい。そうすることで、一度に撤去する場合に比べて、既設鉄塔の撤去作業を安全に無理なく行うことが可能になる。
【００２０】
前記課題を解決する別の観点から、本発明は、既設鉄塔の一側及び他側に延びる一側既設アーム及び他側既設アームを有し、それら一側既設アーム及び他側既設アームに、Ｖ吊り形態となる懸垂碍子装置を介して一側架空線及び他側架空線がそれぞれ架線された鉄塔の建て替え工法であって、
前記一側架空線に通電し、他側架空線を断電した状態で、その他側架空線を他側既設アームの先端側へＩ吊り形態架空線として移動させる第１工程と、
他側架空線に通電し、一側架空線を断電した状態で、既設鉄塔を囲む形態の塔体と、一側既設アームに対応する一側新設アームとを建築する第２工程と、
一側架空線を一側新設アームの先端側にＩ吊り形態架空線として移設する第３工程と、
一側架空線に通電し、他側架空線を断電した状態で、新設鉄塔に他側既設アームに対応する他側新設アームを建築する第４工程と、
他側新設アームに懸垂碍子装置を介して他側架空線をＶ吊り形態架空線として移設する第５工程と、
他側架空線に通電し、一側架空線を断電した状態で、その一側架空線を懸垂碍子装置を介してＶ吊り形態架空線として架線する第６工程と、を含むことを特徴とする。
【００２１】
この工法では、既設鉄塔と同じ場所に新設鉄塔を建築する建て替え工法として好適である。この発明では、既設鉄塔を囲む新設鉄塔を建築して既設鉄塔の全てを撤去する場合、既設鉄塔の一部を利用して新設鉄塔を建てる場合、既設鉄塔を嵩上げする場合、の何れをも含むものとする。
【００２２】
前記第３工程において、既設鉄塔の各一側既設アームを撤去し、前記第５工程において、既設鉄塔の各他側既設アーム及び塔体を撤去することが望ましい。この場合も、既設鉄塔の撤去作業を安全に無理なく行うことが可能になる。
【００２３】
【発明の実施の形態】
以下、本発明の好適な実施の形態について、図面を参照して説明する。
（第１の実施形態）
図１（ａ）、（ｂ）〜図４（ａ）、（ｂ）は、鉄塔建て替え工法の第１の実施形態を示す工程図である。図５は図２に対応する斜視図である。図６（ａ）〜（ｄ）は同じく第１の実施形態を示す平面工程図である。
【００２４】
この実施の形態では、既設鉄塔１０の一側及び他側に延びる一側既設アーム１１及び他側既設アーム１２を有し、それら一側既設アーム１１及び他側既設アーム１２に、Ｖ吊り形態となる懸垂碍子装置１３を介して一側架空線２１及び他側架空線２２がそれぞれ架線された鉄塔の建て替え工法に適用した例を示している。
【００２５】
なお、ここでは、既設鉄塔１０の近くに新設鉄塔３０を建築する建て替え工法例として説明する。その際、通電（充電）されている架空線（送電線）を黒丸で示し、断電（停止）されている架空線を白丸で示す。
【００２６】
まず、図１（ａ）、（ｂ）及び図６（ａ）に示すように、三相交流として３段に架線された図中左側の一側架空線２１に通電し、同じく３段に架線された図中右側の他側架空線２２を断電した状態で、各他側架空線２２を他側既設アーム１２の先端側へＩ吊り形態架空線としてそれぞれ移動させる工程を行う（第１工程）。
【００２７】
この工程において、Ｖ吊り形態架空線をＩ吊り形態架空線とするには、懸垂碍子装置１３のＶ字状に懸垂した一対の絶縁碍子を外した後、アーム先端へＩ吊り形態の懸垂碍子装置に変更し、他側架空線２２を吊り下げる形態とすることで実現できる。これにより他側架空線２２を外側（他側既設アーム１２の先端側）へ移動させて、新設鉄塔３０を建築するための作業空間（離隔距離）を確保する。
【００２８】
次に、図２（ａ）、（ｂ）、図５及び図６（ｂ）に示すように、他側架空線２２に通電し、一側架空線２１を断電した状態で、建て替え用既設鉄塔１０の近くに、図中実線で示す新設鉄塔３０の塔体３０ａと、一側既設アーム１１に対応する図２中左側の一側新設アーム３１とを建築する工程を行う（第２工程）。
【００２９】
なお、新設鉄塔３０の建築位置は、図２（ｂ）、図５及び図６にそれぞれ示すように、建て替え用既設鉄塔１０の近くで、かつ、鉄塔１、２間（径間）方向にほぼ一列に並ぶように配慮される。
【００３０】
次に、同図に示すように、一側架空線２１を一側新設アーム３１の先端側にＩ吊り形態架空線として移設する工程を行う（第３工程）。この工程において、Ｖ吊り形態架空線をＩ吊り形態架空線とするには、前述のように、懸垂碍子装置１３のＶ字状に懸垂した一対の絶縁碍子を外した後、アーム先端へＩ吊り形態の懸垂碍子装置に変更し、一側架空線２１を吊り下げつつ、一側新設アーム３１に移設することで実現できる。
【００３１】
勿論、先に懸垂碍子装置１３を一側新設アーム３１に移設または新設し、その後に一側架空線２１のみを移設する作業手順としてもよい。これにより一側架空線２１を外側（一側新設アーム３１の先端側）へ移動させて、新設鉄塔３０の残りの部分を建築するためおよび既設鉄塔の少なくとも一部を撤去するための作業空間（離隔距離）を確保する。この後、既設鉄塔１０の各一側既設アーム１１を撤去する。
【００３２】
次に、図３（ａ）、（ｂ）及び図６（ｃ）に示すように、一側架空線２１に通電し、他側架空線２２を断電した状態で、新設鉄塔３０に他側既設アーム１２に対応する他側新設アーム３２を建築する工程を行う（第４工程）。
【００３３】
次に、同図にそれぞれ示すように、その他側新設アーム３２に懸垂碍子装置１３を介して他側架空線２２をＶ吊り形態架空線２２として移設する工程を行う（第５工程）。その後、既設鉄塔１０の各他側既設アーム１２と塔体１０ａの一部（上半部）を撤去する。
【００３４】
次に、図４（ａ）、（ｂ）及び図６（ｄ）に示すように、他側架空線２２に通電し、一側架空線２１を断電した状態で、その一側架空線２１を懸垂碍子装置１３を介してＶ吊り形態架空線２１として架線する工程を行う（第６工程）。しかる後、一側架空線２１にも通電して、一側架空線２１及び他側架空線２２を送電状態に復帰させる。その後、既設鉄塔の残りの塔体１０ａ部分も撤去する。
【００３５】
この実施の形態によれば、既設鉄塔１０のＶ吊り形態架空線２１、２２を左右交互にＩ吊り形態としながら、新設鉄塔建築および既設鉄塔撤去に必要な作業空間を確保しつつ、新設鉄塔３０に順次移設する工法を採用している。これは、通電側架空線（充電部）との離隔距離（電気的安全距離）を確保する方法として、架空線をＶ吊り形態とする懸垂碍子装置１３が碍子の片寄りを考慮した鉄塔設計となっていることに着目したもので、これにより鉄塔建て替え作業を安全かつ経済的に実施することができる。
【００３６】
即ち、Ｖ吊り形態の懸垂碍子装置１３を外した後、Ｉ吊り形態の懸垂碍子装置に変更して鉄塔アームの先端側へ架空線を移動させても、鉄塔強度に問題はなく、新設鉄塔３０の塔体３０ａ及び既設鉄塔１０の塔体１０ａとの離隔距離を増やすことができるからである。これにより、１回線交互停止による鉄塔建て替えが可能で、作業者を含む電気的安全性を確保でき、しかも仮設物や特別なスペースが不要で、施工性並びに経済性に優れた鉄塔建て替え工法とすることができる。
【００３７】
図７及び図８（ａ）、（ｂ）は、実際のＶ吊り形態の送電線鉄塔において、離隔距離をどの程度確保できるかを示す説明図である。これらの図に示すように、たとえば、電圧５００ｋＶの鉄塔では、線間距離Ａが２０ｍ、がいし（碍子）支点間距離Ｂが１０ｍ、鉄塔中心から腕金（アーム）先端までの距離が１５ｍ、塔体幅／２が２ｍのとき、塔体との離隔距離は１１ｍである。
【００３８】
これらの図及びデータから、がいし支点間距離Ｂについて、５００ｋＶの場合１０ｍで５ｍ、２７５ｋＶの場合６ｍで３ｍ、１５４ｋＶの場合４ｍで２ｍの離隔距離増と、線間距離Ａの半分により、塔体との離隔距離を確保できることになる。なお、図８（ｂ）には、電圧５００ｋＶ、２７５ｋＶ、１５４ｋＶについて、クレーン車等の離隔距離、作業者、電気設備技術基準の離隔距離をそれぞれ示している。
【００３９】
（第２の実施形態）
図９（ａ）、（ｂ）〜図１２（ａ）、（ｂ）は、鉄塔建て替え工法の第２の実施形態を示す工程図である。図１３は図１０に対応する斜視図である。
【００４０】
この実施の形態では、既設鉄塔１０の一側及び他側に延びる一側既設アーム１１及び他側既設アーム１２を有し、それら一側既設アーム１１及び他側既設アーム１２に、Ｖ吊り形態となる懸垂碍子装置１３を介して一側架空線２１及び他側架空線２２がそれぞれ架線された鉄塔の建て替え工法に適用した例を示している。
【００４１】
なお、ここでは、既設鉄塔１０を囲む形態で既設鉄塔１０とほぼ同じ位置に新設鉄塔３０を建築する建て替え工法例として説明する。その際、通電（充電）されている架空線（送電線）を黒丸で示し、断電（停止）されている架空線を白丸で示す。
【００４２】
まず、図９（ａ）、（ｂ）に示すように、三相交流として３段に架線された図中左側の一側架空線２１に通電し、同じく３段に架線された図中右側の他側架空線２２を断電した状態で、各他側架空線２２を他側既設アーム１２の先端側へＩ吊り形態架空線としてそれぞれ移動させる工程を行う（第１工程）。
【００４３】
この工程において、Ｖ吊り形態架空線をＩ吊り形態架空線とするには、懸垂碍子装置１３のＶ字状に懸垂した一対の絶縁碍子を外した後、アーム先端へＩ吊り形態の懸垂碍子装置に変更し、他側架空線２２を吊り下げる形態とすることで実現できる。これにより他側架空線２２を外側（他側既設アーム１２の先端側）へ移動させて、新設鉄塔３０を建築するための作業空間（離隔距離）を確保する。
【００４４】
次に、図１０（ａ）、（ｂ）及び図１３に示すように、他側架空線２２に通電し、一側架空線２１を断電した状態で、建て替え用既設鉄塔１０を囲む形態で、図中実線で示す新設鉄塔３０の塔体３０ａと、一側既設アーム１１に対応する図２中左側の一側新設アーム３１とを建築する工程を行う（第２工程）。
【００４５】
この新設鉄塔３０の建築に際しては、この実施形態では、先に２脚１面を組み立て、次に残りの２脚３面を組み立てる、公知の２脚１面３面組立工法を採用している。勿論、他の鉄塔建築工法を採用することもできる。いずれの場合も、先の実施形態と同様に、懸垂碍子装置１３でＶ吊り形態からＩ吊り形態に変更し元に戻す工法を組み合わせて行う。
【００４６】
次に、同図に示すように、一側架空線２１を一側新設アーム３１の先端側にＩ吊り形態架空線として移設する工程を行う（第３工程）。この工程において、Ｖ吊り形態架空線をＩ吊り形態架空線とするには、前述のように、懸垂碍子装置１３のＶ字状に懸垂した一対の絶縁碍子を外した後、アーム先端へＩ吊り形態の懸垂碍子装置に変更し、一側架空線２１を吊り下げつつ、一側新設アーム３１に移設することで実現できる。
【００４７】
勿論、先に懸垂碍子装置１３を一側新設アーム３１に移設または新設し、その後に一側架空線２１のみを移設する作業手順としてもよい。これにより一側架空線２１を外側（一側新設アーム３１の先端側）へ移動させて、新設鉄塔３０の残りの部分を建築するための作業空間（離隔距離）を確保する。この後、既設鉄塔１０の各一側既設アーム１１と不要な碍子を撤去する。
【００４８】
次に、図１１（ａ）、（ｂ）に示すように、一側架空線２１に通電し、他側架空線２２を断電した状態で、新設鉄塔３０に他側既設アーム１２に対応する他側新設アーム３２を建築する工程を行う（第４工程）。
【００４９】
次に、同図に示すように、その他側新設アーム３２に懸垂碍子装置１３を介して他側架空線２２をＶ吊り形態架空線２２として移設する工程を行う（第５工程）。その後、既設鉄塔１０の各他側既設アーム１２および塔体の少なくとも一部を撤去する。
【００５０】
次に、図１２（ａ）、（ｂ）に示すように、他側架空線２２に通電し、一側架空線２１を断電した状態で、その一側架空線２１を懸垂碍子装置１３を介してＶ吊り形態架空線２１として架線する工程を行う（第６工程）。しかる後、一側架空線２１にも通電して、一側架空線２１及び他側架空線２２を送電状態に復帰させる。その後、既設鉄塔の残りの部分も撤去する。
【００５１】
この実施の形態によれば、既設鉄塔１０と同じ場所に新設鉄塔３０を建築する建て替え工法として好適であり、鉄塔建て替え作業を安全かつ経済的に実施することができる。その他の作用効果については、第１の実施形態とほぼ同様の作用効果を奏することができる。
【００５２】
なお、この実施の形態では、既設鉄塔１０と同じ場所に新設鉄塔３０を建築する例について述べたが、既設鉄塔１０と同じ場所に新設鉄塔３０を建築して既設鉄塔１０を完全に撤去する場合、既設鉄塔１０の一部を利用して新設鉄塔３０を建てる場合、既設鉄塔１０を嵩上げする場合、の何れにも本発明を適用することができる。
【００５３】
【発明の効果】
以上のように、本発明によれば、１回線交互停止による鉄塔建て替えが可能で、充分な離隔距離の確保により、作業者を含む電気的安全性を確保でき、しかも仮設物や特別なスペースが不要で、施工性並びに経済性に優れた鉄塔建て替え工法を提供することができるといった優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明に係る鉄塔建て替え工法の第１の実施形態を示す工程図である。
【図２】本発明に係る鉄塔建て替え工法の第１の実施形態を示す工程図である。
【図３】本発明に係る鉄塔建て替え工法の第１の実施形態を示す工程図である。
【図４】本発明に係る鉄塔建て替え工法の第１の実施形態を示す工程図である。
【図５】図２に対応する斜視図である。
【図６】本発明に係る鉄塔建て替え工法の第１の実施形態を示す平面工程図である。
【図７】本発明に係る鉄塔建て替え工法の第１の実施形態を示す鉄塔の説明図である。
【図８】本発明の第１の実施形態に係る塔体からの離隔距離等を示す説明図である。
【図９】本発明に係る鉄塔建て替え工法の第２の実施形態を示す工程図である。
【図１０】本発明に係る鉄塔建て替え工法の第２の実施形態を示す工程図である。
【図１１】本発明に係る鉄塔建て替え工法の第２の実施形態を示す工程図である。
【図１２】本発明に係る鉄塔建て替え工法の第２の実施形態を示す工程図である。
【図１３】図１０に対応する斜視図である。
【図１４】従来の鉄塔建て替え工法を示す平面工程図である。
【図１５】従来の鉄塔建て替え工法を示す平面工程図である。
【図１６】従来の鉄塔建て替え工法を示す平面工程図である。
【符号の説明】
１０既設鉄塔
１０ａ塔体
１１一側既設アーム
１２他側既設アーム
１３Ｖ吊り形態の懸垂碍子装置
１４、１５絶縁碍子
３１一側新設アーム
２２他側新設アーム
３０新設鉄塔
３０ａ塔体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel tower rebuilding method, and more particularly, to a technique suitable as a rebuilding method for an existing steel tower using a suspended lever apparatus for overhead wires such as transmission lines in a V-hanging form.
[0002]
[Prior art]
Conventionally, a construction method as shown in FIG. 14 has been widely adopted as a construction method for rebuilding a transmission line tower. This construction method is a method of rebuilding by implementing one-line temporary construction (construction of a temporary tower) in the case of one-line stop condition in system operation.
[0003]
That is, as shown in FIG. 14, when rebuilding the existing steel tower 3 between the steel towers 1 and 2, the procedures shown in FIGS.
[0004]
First, as shown in FIG. 14 (a), the other-side power transmission line 5 is energized and the one-side power transmission line 4 is disconnected, and the existing one is installed in the direction between the one-side power transmission line 4 and the other-side power transmission line 5. The temporary steel tower 6 is constructed at a position sufficiently away from the steel tower 3, and the temporary power transmission line 7 is installed on the arm of the temporary steel tower 6.
[0005]
Next, as shown in FIG. 14B, the existing transmission tower 3 is removed while the one-side transmission line 4 is disconnected from the existing transmission tower 3, the temporary transmission line 7 is energized, and the other-side transmission line 5 is disconnected. To do.
[0006]
Next, as shown in FIG. 14 (c), a new tower 8 is constructed at a target position between the towers 1 and 2, and the other power transmission line 5 is installed on the arm of the new tower 8.
[0007]
Next, as shown in FIG. 14 (d), the other-side power transmission line 5 is energized and the one-side power transmission line 4 is disconnected, and the one-side power transmission line 4 is moved from the temporary tower 6 to the new tower 8. After that, the one-side power transmission line 4 is also energized.
[0008]
This steel tower rebuilding method requires temporary work such as temporary steel tower 6 and temporary power transmission line 7. For this reason, there are problems such as an increase in construction costs and a problem that it is difficult to secure a construction site for a temporary steel tower.
[0009]
Therefore, as a steel tower rebuilding method by the recent one-line alternate stop, a two-leg 1/2 plane wrapping method (refer to Patent Document 1), a cable jumper method (refer to Patent Document 2, FIG. 13 and the like), and a temporary construction using a large jumper is simplified. Chemical methods (see Fig. 14) have been developed.
[0010]
In the cable jumper method shown in FIG. 15, when the existing steel tower 3 between the steel towers 1 and 2 is rebuilt to the new steel tower 8, a cable jumper wire (insulated coated electric wire) 9a that replaces the transmission line 5 in the section necessary for the rebuilding work is provided. It is a construction method that cuts off the power transmission line (bare wire) 5 in the rebuilding construction section to provide electrical safety by providing it in parallel.
[0011]
In the long jumper method shown in FIG. 16, when the existing tower 3 between the towers 1 and 2 is rebuilt to the new tower 8, temporary support columns 1a and 1b are built outside the tower site, and these support columns 1a and 1b are installed. It is a construction method that uses the temporary power transmission line 9b that largely bypasses the transmission line 5 outside the section necessary for the steel tower rebuilding construction to increase the electrical safety of the rebuilding construction section.
[0012]
[Patent Document 1]
JP 2000-345740 A [Patent Document 2]
Japanese Patent Laid-Open No. 2000-270454
[Problems to be solved by the invention]
However, the steel tower rebuilding method using one line alternate stop has problems to be solved in the following points.
(1) The two-leg half-plane wrapping method has a problem that the existing steel tower has a small margin of strength, although the existing steel tower is given strength. Therefore, the period when typhoons and strong winds are expected cannot be adopted. This problem also applies to the raising method.
(2) The cable jumper method cannot be used in terms of equipment capacity for ultra-high voltage transmission lines.
(3) The long jumper method requires a simple support column, and the ultra high voltage transmission line has a large clearance from the jumper and the support column becomes excessive.
[0014]
Therefore, the problem of the present invention is that a steel tower can be rebuilt by alternately stopping one line, electrical safety can be ensured by securing a sufficient separation distance, and there is no need for temporary structures or special spaces, so that workability and economic efficiency are eliminated. It is to provide an excellent steel tower rebuilding method.
[0015]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention employs the following means.
The present invention has one side existing arm and the other side existing arm that extend to one side and the other side of the existing steel tower, and the one side existing arm and the other side existing arm are connected via a suspended lever device in the form of a V suspension. It is a rebuilding method of a steel tower in which one side overhead line and the other side overhead line are respectively wired.
A first step of energizing the one side overhead wire and disconnecting the other side overhead wire to move the other side overhead wire to the tip side of the other side existing arm as an I-hanging overhead wire;
A second step of building a tower of a new steel tower and a new one-side arm corresponding to the one-side existing arm between the existing steel towers while energizing the other-side overhead line and disconnecting the one-side overhead line;
A third step of transferring the one-side overhead wire to the tip side of the one-side newly installed arm as an I-suspended overhead wire;
A fourth step of building the other side new arm corresponding to the other side existing arm on the new tower while energizing the one side overhead wire and disconnecting the other side overhead wire;
A fifth step of relocating the other side overhead wire as a V-hanging type overhead wire via a suspended lever device to the other side new arm;
Including a sixth step of energizing the other-side overhead wire and disconnecting the one-side overhead wire as a V-hanging overhead wire via the suspended lever device in a state where the one-side overhead wire is disconnected. To do.
[0016]
According to the present invention, the construction method is adopted in which the existing steel tower and the new steel tower are alternately suspended from left to right while the I-hanging form is used alternately, while the work space necessary for the construction of the new steel tower is secured and the work is sequentially transferred to the new steel tower. ing. This is a tower design in which the suspension insulator device with the overhead wire as a V-hanging form takes into account the deviation of the insulator as a method of securing a separation distance (electrical safety distance) from the energizing side overhead wire (charging part). It is the thing which paid attention to.
[0017]
In other words, even if the V suspension suspension insulator is changed to the I suspension suspension insulator and the overhead wire is moved to the tip side of the tower arm, there is no problem with the tower strength, and the separation distance from the tower body of the new and existing tower can be increased. Because it can. As a result, the steel tower can be rebuilt by alternately stopping one line, electrical safety can be ensured, temporary structures and special spaces are unnecessary, and the steel tower can be rebuilt with excellent workability and economy. This method is suitable as a rebuilding method for constructing a new steel tower near an existing steel tower.
[0018]
In the present invention, when there are a plurality of the one-side overhead lines and the other-side overhead lines, it is desirable to perform the respective steps for each of the one-side overhead line group and the other-side overhead line group. This is because the workability and safety can be improved by carrying out the work separately for each overhead wire group on one side.
[0019]
In the third step, it is desirable to remove each one-side existing arm of the existing steel tower, and in the fifth step, remove at least a part of each other-side existing arm and tower body of the existing steel tower. By doing so, it is possible to safely and effortlessly remove the existing steel tower as compared to removing it at once.
[0020]
From another point of view to solve the above-mentioned problem, the present invention has one side existing arm and another side existing arm extending to one side and the other side of the existing tower, and the one side existing arm and the other side existing arm have V It is a rebuilding method of a steel tower in which the one side overhead wire and the other side overhead wire are respectively wired through the suspended insulator device that is suspended,
A first step of energizing the one side overhead wire and disconnecting the other side overhead wire to move the other side overhead wire to the tip side of the other side existing arm as an I-hanging overhead wire;
A second step of building a tower body in a form surrounding an existing steel tower and a one-side new arm corresponding to the one-side existing arm in a state where the other-side overhead line is energized and the one-side overhead line is disconnected;
A third step of transferring the one-side overhead wire to the tip side of the one-side newly installed arm as an I-suspended overhead wire;
A fourth step of building the other side new arm corresponding to the other side existing arm on the new tower while energizing the one side overhead wire and disconnecting the other side overhead wire;
A fifth step of relocating the other side overhead wire as a V-hanging type overhead wire via a suspended lever device to the other side new arm;
Including a sixth step of energizing the other-side overhead wire and disconnecting the one-side overhead wire as a V-hanging overhead wire via the suspended lever device in a state where the one-side overhead wire is disconnected. To do.
[0021]
This construction method is suitable as a rebuilding construction method for constructing a new steel tower in the same place as the existing steel tower. In this invention, when constructing a new steel tower that surrounds the existing steel tower and removing all of the existing steel tower, constructing a new steel tower using a part of the existing steel tower, or raising the existing steel tower, both are included. Shall be.
[0022]
In the third step, it is desirable to remove each one-side existing arm of the existing steel tower, and in the fifth step, remove each other-side existing arm and tower body of the existing steel tower. Also in this case, it is possible to safely and easily remove the existing steel tower.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
(First embodiment)
FIGS. 1A and 1B to FIGS. 4A and 4B are process diagrams illustrating a first embodiment of a steel tower rebuilding method. FIG. 5 is a perspective view corresponding to FIG. FIGS. 6A to 6D are plan process views showing the first embodiment.
[0024]
In this embodiment, it has the one side existing arm 11 and the other side existing arm 12 which extend to the one side and the other side of the existing tower 10, and the one side existing arm 11 and the other side existing arm 12 are provided with a V suspension form. The example applied to the rebuilding method of the steel tower in which the one side overhead wire 21 and the other side overhead wire 22 were respectively wired via the hanging insulator apparatus 13 which becomes.
[0025]
In addition, here, it demonstrates as an example of the rebuilding construction method which builds the new steel tower 30 near the existing steel tower 10. FIG. At this time, an overhead line (power transmission line) that is energized (charged) is indicated by a black circle, and an overhead line that is disconnected (stopped) is indicated by a white circle.
[0026]
First, as shown in FIGS. 1 (a), 1 (b) and 6 (a), the one-side overhead wire 21 on the left side in the figure, which is wired in three steps as a three-phase alternating current, is energized, and the wires are also connected in the same three steps. In the state where the other overhead wire 22 on the right side in the figure is disconnected, a step of moving each other overhead wire 22 as an I-hanging overhead wire to the tip side of the other existing arm 12 is performed (first step). ).
[0027]
In this process, in order to make the V-suspended overhead line into the I-suspended overhead line, after removing the pair of insulators suspended in a V shape of the suspended insulator device 13, the suspended insulator device having the I-suspended shape is attached to the tip of the arm. This can be realized by suspending the other side overhead wire 22. Thereby, the other side overhead wire 22 is moved to the outside (the tip side of the other side existing arm 12), and a work space (separation distance) for building the new tower 30 is secured.
[0028]
Next, as shown in FIGS. 2 (a), 2 (b), 5 and 6 (b), the other side overhead wire 22 is energized and the one side overhead wire 21 is disconnected. A step of building a tower body 30a of the new tower 30 shown by a solid line in the drawing and the one new arm 31 on the left side in FIG. 2 corresponding to the one existing arm 11 is performed near the tower 10 (second step). .
[0029]
As shown in FIGS. 2 (b), 5 and 6, the building position of the new steel tower 30 is close to the existing steel tower 10 for rebuilding and in the direction between the steel towers 1 and 2 (span). Consideration is to be placed in a line.
[0030]
Next, as shown in the figure, a step of moving the one-side overhead wire 21 as an I-suspended overhead wire to the tip side of the one-side newly installed arm 31 is performed (third step). In this process, in order to change the V-hanging overhead wire to the I-hanging overhead wire, as described above, after removing the pair of insulators suspended in the V shape of the hanging insulator device 13, the I-suspending wire is suspended from the arm tip. It can implement | achieve by changing to the suspension insulator apparatus of a form, and moving to the 1 side new installation arm 31, suspending the 1 side overhead wire 21. FIG.
[0031]
Of course, the suspension lever device 13 may be moved or newly installed on the one side new arm 31 first, and then only the one side overhead wire 21 may be moved thereafter. As a result, the work space for moving the one-side overhead wire 21 to the outside (the tip side of the one-side new arm 31) to construct the remaining part of the new tower 30 and to remove at least part of the existing tower ( Ensure separation distance. Then, each one side existing arm 11 of the existing steel tower 10 is removed.
[0032]
Next, as shown in FIGS. 3 (a), (b) and FIG. 6 (c), the one side overhead wire 21 is energized and the other side overhead wire 22 is disconnected. A step of building the other side new arm 32 corresponding to the existing arm 12 is performed (fourth step).
[0033]
Next, as shown in the figure, a step of moving the other side overhead wire 22 to the other side new arm 32 via the suspended lever device 13 as the V-hanging type overhead wire 22 is performed (fifth step). Then, each other side existing arm 12 of the existing steel tower 10 and a part (upper half part) of the tower body 10a are removed.
[0034]
Next, as shown in FIGS. 4A, 4 </ b> B, and 6 </ b> D, the one-side overhead wire 21 is energized while the other-side overhead wire 22 is energized and the one-side overhead wire 21 is disconnected. Is carried out as a V-hanging type overhead wire 21 through the suspended lever device 13 (sixth step). Thereafter, the one-side overhead line 21 is energized to return the one-side overhead line 21 and the other-side overhead line 22 to the power transmission state. Thereafter, the remaining tower body 10a portion of the existing steel tower is also removed.
[0035]
According to this embodiment, while the V suspension type overhead wires 21 and 22 of the existing tower 10 are alternately left and right, the new tower 30 is secured while securing the work space necessary for the construction of the new tower and the removal of the existing tower. The construction method is gradually being relocated. As a method of securing a separation distance (electrical safety distance) from the energization side overhead wire (charging part), the suspended insulator device 13 having the overhead wire as a V-hanging form is designed with a steel tower considering the deviation of the insulator. This makes it possible to safely and economically carry out the rebuilding work of the steel tower.
[0036]
In other words, after removing the suspended suspension device 13 in the V-suspension form, there is no problem in the strength of the tower even if the overhead suspension wire is moved to the tip side of the tower arm by changing to the suspension structure device in the I suspension form. This is because the distance between the tower body 30a and the tower body 10a of the existing steel tower 10 can be increased. As a result, it is possible to rebuild the steel tower by stopping one line alternately, ensuring electrical safety including workers, and eliminating the need for temporary structures and special spaces, making the steel tower rebuilding method excellent in workability and economy. be able to.
[0037]
FIG.7 and FIG.8 (a), (b) is explanatory drawing which shows how much separation distance can be ensured in the transmission line tower of an actual V suspension form. As shown in these figures, for example, in a steel tower with a voltage of 500 kV, the distance A between the lines is 20 m, the distance B between the insulator (insulator) fulcrums is 10 m, the distance from the steel tower center to the tip of the arm (arm) is 15 m, When the body width / 2 is 2 m, the separation distance from the tower is 11 m.
[0038]
From these figures and data, the distance between the insulator fulcrums B is 5 m at 10 m for 500 kV, 3 m for 6 m for 275 kV, 2 m for 4 m for 154 kV, and half the distance A between the lines. A separation distance can be secured. FIG. 8B shows the separation distance of the crane vehicle, the operator, and the separation distance of the electric equipment technical standards for the voltages of 500 kV, 275 kV, and 154 kV, respectively.
[0039]
(Second Embodiment)
FIGS. 9A and 9B to 12A and 12B are process diagrams showing a second embodiment of the steel tower rebuilding method. FIG. 13 is a perspective view corresponding to FIG.
[0040]
In this embodiment, it has the one side existing arm 11 and the other side existing arm 12 which extend to the one side and the other side of the existing tower 10, and the one side existing arm 11 and the other side existing arm 12 are provided with a V suspension form. The example applied to the rebuilding method of the steel tower in which the one side overhead wire 21 and the other side overhead wire 22 were respectively wired via the hanging insulator apparatus 13 which becomes.
[0041]
In addition, it demonstrates as an example of the rebuilding construction method which constructs the new steel tower 30 in the substantially same position as the existing steel tower 10 in the form surrounding the existing steel tower 10 here. At this time, an overhead line (power transmission line) that is energized (charged) is indicated by a black circle, and an overhead line that is disconnected (stopped) is indicated by a white circle.
[0042]
First, as shown in FIGS. 9 (a) and 9 (b), the one-side overhead wire 21 on the left side in the figure that is wired in three stages as a three-phase alternating current is energized, and the right side in the figure that is also wired in three stages. In a state where the other-side overhead wire 22 is disconnected, a step of moving each other-side overhead wire 22 to the distal end side of the other-side existing arm 12 as an I-suspended overhead wire is performed (first step).
[0043]
In this process, in order to change the V-hanging overhead wire to the I-hanging overhead wire, after removing the pair of insulators suspended in a V shape of the hanging insulator device 13, the hanging insulator device of the I hanging shape is attached to the arm tip. This can be realized by suspending the other side overhead wire 22. Thereby, the other side overhead wire 22 is moved to the outside (the tip side of the other side existing arm 12), and a work space (separation distance) for building the new tower 30 is secured.
[0044]
Next, as shown in FIGS. 10A, 10 </ b> B, and 13, in the form that encloses the existing tower 10 for rebuilding in a state where the other overhead wire 22 is energized and the one overhead wire 21 is disconnected. The step of constructing the tower body 30a of the new steel tower 30 indicated by the solid line in the drawing and the one side new arm 31 on the left side in FIG. 2 corresponding to the one side existing arm 11 is performed (second step).
[0045]
In constructing the new steel tower 30, in this embodiment, a known two-leg / one-surface / three-surface assembly method is adopted in which the two legs / one surface is assembled first, and then the remaining two legs / three surfaces are assembled. Of course, other steel tower construction methods can be employed. In any case, similarly to the previous embodiment, the suspension lever device 13 is used in combination with a method of changing from the V-suspended configuration to the I-suspended configuration and returning to the original configuration.
[0046]
Next, as shown in the figure, a step of moving the one-side overhead wire 21 as an I-suspended overhead wire to the tip side of the one-side newly installed arm 31 is performed (third step). In this process, in order to change the V-hanging overhead wire to the I-hanging overhead wire, as described above, after removing the pair of insulators suspended in the V shape of the hanging insulator device 13, the I-suspending wire is suspended from the arm tip. It can implement | achieve by changing to the suspension insulator apparatus of a form, and moving to the 1 side new installation arm 31, suspending the 1 side overhead wire 21. FIG.
[0047]
Of course, the suspension lever device 13 may be moved or newly installed on the one side new arm 31 first, and then only the one side overhead wire 21 may be moved thereafter. Thereby, the one side overhead wire 21 is moved to the outside (the tip side of the one side new arm 31), and a work space (separation distance) for constructing the remaining part of the new tower 30 is secured. Then, each one side existing arm 11 of the existing tower 10 and an unnecessary insulator are removed.
[0048]
Next, as shown in FIGS. 11A and 11B, the one-side overhead wire 21 is energized and the other-side overhead wire 22 is disconnected, and the new tower 30 corresponds to the other-side existing arm 12. A step of building the other side new arm 32 is performed (fourth step).
[0049]
Next, as shown in the figure, a step of moving the other side overhead wire 22 to the other side new arm 32 through the suspended lever device 13 as a V-hanging overhead wire 22 is performed (fifth step). Thereafter, at least a part of each other-side existing arm 12 and the tower body of the existing steel tower 10 is removed.
[0050]
Next, as shown in FIGS. 12A and 12B, in the state where the other side overhead wire 22 is energized and the one side overhead wire 21 is disconnected, the one side overhead wire 21 is connected to the suspended lever device 13. A step of overhanging as the V-hanging overhead wire 21 is performed (sixth step). Thereafter, the first overhead wire 21 is energized to return the first overhead wire 21 and the second overhead wire 22 to the power transmission state. After that, the rest of the existing tower will be removed.
[0051]
According to this embodiment, it is suitable as a rebuilding method for building the new tower 30 in the same place as the existing tower 10, and the tower rebuilding work can be carried out safely and economically. About the other effect, the effect similar to 1st Embodiment can be show | played.
[0052]
In this embodiment, the example in which the new steel tower 30 is constructed at the same location as the existing steel tower 10 has been described. However, when the new steel tower 30 is constructed at the same location as the existing steel tower 10 and the existing steel tower 10 is completely removed. The present invention can be applied to any case where the new steel tower 30 is built using a part of the existing steel tower 10 and where the existing steel tower 10 is raised.
[0053]
【The invention's effect】
As described above, according to the present invention, it is possible to rebuild a steel tower by alternately stopping one line, and by securing a sufficient separation distance, it is possible to ensure electrical safety including workers, and there is no temporary structure or special space. The steel tower rebuilding method which is unnecessary and has excellent workability and economical efficiency can be provided.
[Brief description of the drawings]
FIG. 1 is a process diagram showing a first embodiment of a steel tower rebuilding method according to the present invention.
FIG. 2 is a process diagram showing a first embodiment of a steel tower rebuilding method according to the present invention.
FIG. 3 is a process diagram showing a first embodiment of a steel tower rebuilding method according to the present invention.
FIG. 4 is a process diagram showing a first embodiment of a steel tower rebuilding method according to the present invention.
FIG. 5 is a perspective view corresponding to FIG. 2;
FIG. 6 is a plan process diagram showing a first embodiment of a steel tower rebuilding method according to the present invention.
FIG. 7 is an explanatory diagram of a steel tower showing a first embodiment of a steel tower rebuilding method according to the present invention.
FIG. 8 is an explanatory diagram showing a separation distance from the tower body according to the first embodiment of the present invention.
FIG. 9 is a process diagram showing a second embodiment of the steel tower rebuilding method according to the present invention.
FIG. 10 is a process diagram showing a second embodiment of the steel tower rebuilding method according to the present invention.
FIG. 11 is a process diagram showing a second embodiment of the steel tower rebuilding method according to the present invention.
FIG. 12 is a process diagram showing a second embodiment of the steel tower rebuilding method according to the present invention.
13 is a perspective view corresponding to FIG.
FIG. 14 is a plan view showing a conventional steel tower rebuilding method.
FIG. 15 is a plan process diagram showing a conventional steel tower rebuilding method.
FIG. 16 is a plan view showing a conventional steel tower rebuilding method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Existing steel tower 10a Tower 11 One side existing arm 12 The other side existing arm 13 The suspended insulator apparatus 14 and 15 of the V suspension form Insulator 31 One side new arm 22 The other side new arm 30 New tower 30a Tower

Claims

One side existing arm and the other side existing arm that extend to one side and the other side of the existing tower, and the one side overhead wire is connected to the one side existing arm and the other side existing arm via a suspended lever device in the form of a V suspension. And the rebuilding method of the steel tower where the other side overhead lines are respectively wired,
A first step of energizing the one side overhead wire and disconnecting the other side overhead wire to move the other side overhead wire to the tip side of the other side existing arm as an I-hanging overhead wire;
A second step of building a tower of a new steel tower and a new one-side arm corresponding to the one-side existing arm between the existing steel towers while energizing the other-side overhead line and disconnecting the one-side overhead line;
A third step of transferring the one-side overhead wire to the tip side of the one-side newly installed arm as an I-suspended overhead wire;
A fourth step of building the other side new arm corresponding to the other side existing arm on the new tower while energizing the one side overhead wire and disconnecting the other side overhead wire;
A fifth step of relocating the other side overhead wire as a V-hanging type overhead wire via a suspended lever device to the other side new arm;
A sixth method of building a steel tower including the sixth step of connecting the one side overhead wire as a V-hanging type overhead wire via a suspended insulator device in a state where the other side overhead wire is energized and the one side overhead wire is disconnected.

One side existing arm and the other side existing arm that extend to one side and the other side of the existing tower, and the one side overhead wire is connected to the one side existing arm and the other side existing arm via a suspended lever device in the form of a V suspension. And the rebuilding method of the steel tower where the other side overhead lines are respectively wired,
A first step of energizing the one side overhead wire and disconnecting the other side overhead wire to move the other side overhead wire to the tip side of the other side existing arm as an I-hanging overhead wire;
A second step of building a tower body in a form surrounding an existing steel tower and a one-side new arm corresponding to the one-side existing arm in a state where the other-side overhead line is energized and the one-side overhead line is disconnected;
A third step of transferring the one-side overhead wire to the tip side of the one-side newly installed arm as an I-suspended overhead wire;
A fourth step of building the other side new arm corresponding to the other side existing arm on the new tower while energizing the one side overhead wire and disconnecting the other side overhead wire;
A fifth step of relocating the other side overhead wire as a V-hanging type overhead wire via a suspended lever device to the other side new arm;
A sixth method of building a steel tower including the sixth step of connecting the one side overhead wire as a V-hanging type overhead wire via a suspended insulator device in a state where the other side overhead wire is energized and the one side overhead wire is disconnected.

3. The steel tower rebuilding method according to claim 1, wherein there are a plurality of the one-side overhead wires and the other-side overhead wires, and the respective steps are performed for each of the one-side overhead wire group and the other-side overhead wire group.

The steel tower rebuilding method according to claim 1, wherein the new steel tower is constructed near an existing steel tower for rebuilding.

The tower rebuilding according to claim 1, wherein, in the third step, each one-side existing arm of the existing steel tower is removed, and in the fifth step, each other-side existing arm of the existing steel tower and at least a part of the tower body are removed. Construction method.

3. The rebuilding of a tower according to claim 2, wherein, in the third step, each one-side existing arm of the existing steel tower is removed, and in the fifth step, each other-side existing arm of the existing steel tower and at least a part of the tower body are removed. Construction method.