JP3787710B2

JP3787710B2 - Gondola device for dismantling cylindrical storage tank and dismantling method

Info

Publication number: JP3787710B2
Application number: JP32800196A
Authority: JP
Inventors: 宏治石井; 博早川
Original assignee: 株式会社石井鐵工所
Priority date: 1996-11-25
Filing date: 1996-11-25
Publication date: 2006-06-21
Anticipated expiration: 2016-11-25
Also published as: JPH10153000A

Description

【０００１】
【発明の属する技術分野】
この発明は、鋼製円筒形の側板周壁を有する大型の貯槽、例えばガソリン、原油等を貯蔵する円筒形貯槽の解体を行うゴンドラ装置とこのゴンドラ装置を使用する解体工法に関するものである。
【０００２】
【従来の技術】
鋼製円筒形の側板周壁を有する大型の貯槽は、建設後長い年月を経過し老朽化すると、安全のために解体する必要が生じている。また、貯槽の用途変更や立地条件等の変更によって、建て替えや解体撤去などの必要も生じている。
【０００３】
これらの貯槽を解体する場合、従来解体工法の第１番目の一般的な解体工法としては、図示は省略するが、まず円筒形貯槽の側板周壁の外周全体に総足場を仮設し、その足場上で作業者が、側板周壁をガス切断等で切断してブロック化し、そのブロック化した側板周壁を吊り下げ装置やクレーン等の重機で降下し、高所より順次下部に向かって繰り返して解体し、上記仮設した総足場は、この解体作業に従って順次解体撤去されている。
【０００４】
また、第２番目の従来解体工法として、同じく図示を省略するが、周壁の最上部からクレーン等の上で、周壁を渦巻き状ラインに沿って所定幅に順次切断していく切断工程と、切断工程の後又はこれに並行して、前記切断した部位の上部周壁から渦巻き状に連続した細長い切断帯を順次下方へ引き下げつつ、地上所定位置にて連続した細長い切断帯を所定長の短冊状に裁断していく工程により、あたかもリンゴの皮を剥いていくように周壁を解体していく方法である。
【０００５】
【発明が解決しようとする課題】
しかしながら、上述のような第１番目の一般的な従来解体工法では、解体する貯槽の全周に亙って総足場を仮設して側板周壁を切断撤去して解体しなければならないので、大掛かりで部材数の多い複雑な足場を必要とし、総足場の組立て仮設作業及び解体撤去作業が繁雑で、時間もかかり作業能率の低下を余儀なくされ、また、貯槽周壁の解体作業と足場の解体撤去作業等が並行するため、作業の安全性にもかなりの配慮が必要となった。
【０００６】
また、第２番目のリンゴの皮剥きのように切断する従来解体工法は、クレーン等の上で切断作業を行う場合は、貯槽全周に亙ってクレーン等重機の移動する広い場所が必要で、周囲が狭い場合や周囲に他の設備が隣接している場合は施工が困難になる問題、クレーン等を常駐させるためその費用が多くかかる問題、クレーン等の上での不安定な切断作業のため安全性の問題、また、切断帯を地上まで引き下げ可能な細長い幅に切断する手間がかかり、また引き延ばして下げる作業も大変で作業能率が低下する問題等があった。
【０００７】
この発明は、上述のような従来技術が有する問題点に鑑みてなされたもので、解体する貯槽周壁の全周に亙る大掛かりで、組立てと解体が繁雑な総足場を仮設する必要がなく、また貯槽の全周に亙るクレーン等の重機移動の広い場所の必要がなく、クレーン等の重機上での不安定な作業もなく、かつ作業能率が低下することもないように、解体する貯槽の側板上端縁に、螺旋状方向に沿わせて自走移動可能なゴンドラ装置を懸架し、このゴンドラ装置に作業足場を水平維持形成し、この作業足場を利用して、貯槽の側板を上部から連続して螺旋状に部分切断し、吊り下げ撤去していくようにした、作業能率の良いかつ安全な解体を行うゴンドラ装置とこのゴンドラ装置を使用する円筒形貯槽の解体工法を提供するものである。
【０００８】
【課題を解決するための手段】
請求項１記載の発明に係る円筒形貯槽の解体用ゴンドラ装置は、型鋼材等を矩形立体格子状に組枠して形成した支持架構本体と、この支持架構本体両側の垂直上方向に延出するアームと、このアームの上部に設けたローラーを上記螺旋状切断の始端段差部の所定範囲に自走可能に懸け渡して設けたガイド装置と、上記矩形立体格子状に組枠した支持架構本体中央部に設けた水平維持調整可能な作業足場とを備え、構造が簡単で、自走移動が円滑で安定し、操作が容易、かつ安全な作業用の移動足場とするものである。
【０００９】
また、上記円筒形貯槽の解体用ゴンドラ装置は、その支持架構本体の上部に切断作業時は側板部を吊り下げ保持し、切断作業終了後は切り離した側板部を吊り下げ降下する吊り架構と吊り下げ装置を設け、別個に吊り下げ保持や吊り下げ降下する装置等を設ける必要がなく、切断作業と連携させて吊り下げ降下撤去の一連の作業を円滑に能率良く行い、かつゴンドラ装置と側板部の相互の重量を安定支持しバランスを保って上述の一連の作業を安全に行うようにした吊り装置兼用の移動足場とする
ものである。
【００１０】
請求項２記載の発明に係る円筒形貯槽の解体工法は、上記請求項１記載の円筒形貯槽の解体用ゴンドラ装置を解体する貯槽の側板上端縁の所定範囲に螺旋状に傾斜して走行するように自走可能に懸架し、この自走可能なゴンドラ装置に作業足場を水平維持形成し、この作業足場を利用して、所定長の側板上部を吊り下げ保持した状態で螺旋状に部分切断し、この部分切断した側板部を吊り下げ降下撤去し、次いで上記切断した螺旋状の側板上端縁に沿わせてゴンドラ装置を次に部分切断する所定長だけ自走させて降下移動し、この所定長の側板部の吊り下げ保持とその吊り下げ保持状態での部分切断と吊り下げ降下撤去とゴンドラ装置の自走降下移動の順次繰り返しで、上方から下方に向けて螺旋状に沿って連続して解体する工法で、大掛かりで繁雑な総足場、貯槽周囲の広い作業場所、大掛かりな機械装置などを必要とすることなく、作業能率良く短期間に、かつ安全に施工するものである。
【００１１】
【発明の実施の形態】
この発明に係る円筒形貯槽の解体用ゴンドラ装置とこのゴンドラ装置を使用する解体工法の実施形態の一例の概要を、図１及至図３に基づいて説明する。例示した貯槽１は、鋼製側板２を有する有底直立円筒形に形成されている。
【００１２】
図１に示すように、貯槽１の側板２を解体するにあたり、側板２の上端縁部に解体作業用の作業足場４を有するゴンドラ装置３を自走可能に懸架する。このゴンドラ装置３の作業足場４上に乗って、ゴンドラ装置３を懸架した間の側板２上部所定長の側板部５を、予め吊り下げ保持し安定させた状態で、周方向螺旋状に沿って部分切断する。切断作業終了後は、切り離した側板部５の重量を吊り下げ支えた後、ゴンドラ装置３の懸架側と反対側の貯槽１の内部側に降下し撤去する。次に、上記切断した側板２上端縁部を走行用ガイドレールに使用し、この傾斜した螺旋状に沿わせてゴンドラ装置３をその自重と螺旋状側板上端部の傾斜角度を利用してローラーを介して自走させて降下移動し、再び側板２の切断と撤去を所定幅毎に順次繰り返しながら、図１の一点鎖線の螺旋状に沿って貯槽１の上方から下方に向かって側板２を順次解体していく。
【００１３】
ゴンドラ装置３は、型鋼材及びパイプ材等又はそれらを組合せて使用し、矩形立体格子状に組枠して支持架構本体６を形成する。この支持架構本体６の中央内部に作業足場４を設ける。この作業足場４は、上部に作業者が乗って切断作業などができるように、例えば幅０．３メートル〜２メートル程度、長さ１メートル〜６メートル程度の広さで水平な床面に形成する。また、支持架構本体６の両側から垂直上方向に延出するアーム７Ａ，７Ｂを設け、アーム７Ａ，７Ｂの先端部に側板２上端縁に係合し案内するガイド装置８Ａ，８Ｂを設ける。このアーム７Ａ，７Ｂは、例えば、パイプ材など二重管等で摺動し、ジャッキやネジ付ラック等で伸縮させ、所定長さ位置に調整し止めネジ等で固定する構造に形成して作業足場４が常時水平状態に維持されるようにする。
【００１４】
なお、上記ゴンドラ装置３の支持架構本体６及び作業足場４の側板２に対向する側面は、側板２の曲率に合うように弧状に湾曲させて形成しておくと、側板２の曲がりが大きい場合やゴンドラ装置３の長さが長い場合にゴンドラ装置３と側板２との間に大きな隙間を生じることがなく、この隙間から物が落下する心配や作業者がこの隙間に足を挟まれる心配などがなくなり安全である。また、ゴンドラ装置３の側面が側板２と平行に沿っているため、ゴンドラ装置３の自走降下移動の際に、ゴンドラ装置３の側面を側板２に局部的に当てることがなく、また異常に摩擦などすることがなく移動が円滑かつ安全である。
【００１５】
上記ゴンドラ装置３の作業足場４を利用して、図１の斜線で示すように、貯槽１の側板２の切断開始から１周目は、水平の側板１上端縁から所定角度傾斜した螺旋状に沿って、徐々に切断高さを増しながら切断していく。この際に、作業足場４が水平状態を維持するように、この高さ増加分だけ、上記したゴンドラ装置３の前方のアーム７Ａを徐々に伸出させていく。
【００１６】
なお、図示しないが、側板の上部外周にウィンドガーダーを有する貯槽の場合には、ゴンドラ装置３を使用することなく、そのウィンドガーダーを作業足場に利用しその上に作業者が乗って、上記１周目の切断を行うようにしてもよい。また、屋根上部外周の歩廊が利用できる場合や、クレーン等が一時的に使用できる場合にも、ゴンドラ装置３を使用することなく、上記１周目の切断を行うようにしてもよい。
【００１７】
次いで２周目からは、図１及び図２のように、上下段差を生じた切断個所の始端部は、上下両方の側板２上端縁ともに、所定角度に傾斜した螺旋状になるため、ゴンドラ装置３のアーム７Ａ，７Ｂの伸縮度合いを一定に固定した状態で使用する。
【００１８】
なお、上記螺旋状に傾斜させて切断する切断高さ、つまり傾斜角度を、上方から下方に行くに従って徐々に増加、又は減少させ切断量を変化させるようにしてもよい。例えば、上方の高所位置では作業の安全性を図るために、切断する大きさを小さくし重量を少なくするとともに、下方の低所位置に行くに従って作業能率を高めるために、切断する大きさと重量を増加させるようにしてもよい。この場合には、上記ゴンドラ装置３の前方のアーム７Ａは、下方に行くに従って徐々に伸出させて、作業足場４の水平状態を常に維持しながらゴンドラ装置３を降下移動させていくようにする。
【００１９】
上記アーム７Ａ，７Ｂの先端部に設けるガイド装置８Ａ，８Ｂについて、図２及び図３に基づいて説明する。ガイド装置８Ａ，８Ｂは、回転自在に取り付けた上端ローラー９Ａ，９Ｂと側面ローラー１０Ａ，１０Ｂとから形成し、それぞれ、螺旋状に切断する始端位置の段差部に、切断する側板部５を中間部に跨ぐように掛け渡して係合する。この上端ローラー９Ａ，９Ｂは、ゴンドラ装置３の自重及び作業時の積載荷重を支持し、脱輪することなく円滑に回転するように、側板２の上端縁部に垂直に当接させて取付ける。また、側面ローラー１０Ａ，１０Ｂは、ゴンドラ装置３が側板２から離れないように、上端ローラー９Ａ，９Ｂの軸心から延出させ、側板２の上端縁を超えて、ゴンドラ装置３と反対側に位置する貯槽１の内部方向から側面に強く当接し、螺旋方向と平行する方向に回転するように取付ける。
【００２０】
また、ゴンドラ装置３の支持架構本体６の下側面部に、側板２側面に当接し螺旋方向と平行方向に回転するようにサイドローラー１１Ａ，１１Ｂを取付ける。
このサイドローラー１１Ａ，１１Ｂによって、ゴンドラ装置３は摩擦抵抗を受けることなく、側板２に沿って円滑に移動することができる。
【００２１】
上述のように懸架したゴンドラ装置３は、側板２の傾斜した螺旋状の切断上端縁を走行用のガイドレールにして、側板２側面に沿って上方から下方に向かって、自らの重量によって上記各ローラーが円滑に回転することにより、別個に駆動装置を設ける必要がなく、自走させて容易に降下移動することができる。
【００２２】
また、螺旋状の切断始端位置の段差部に上端ローラー９Ａ，９Ｂを掛け渡した状態でゴンドラ装置３を懸架しているため、後方の上端ローラー９Ｂがこの段差部に遮られるため、ゴンドラ装置３は所定長以上に移動や暴走する心配がなく、移動操作の際に安全性が保たれる。
【００２３】
なお、このゴンドラ装置３には、図示省略したが、切断作業中は移動することなく停止させ、かつ自走移動時には停止を解除するように、上端ローラー９の回転を直接止める構造又は上端ローラー９の走行を阻害する構造などの停止機構及びその解除機構を設ける。
【００２４】
このように形成したゴンドラ装置３は、作業足場４を常に水平状態に維持しながら、側板２の傾斜した螺旋状の切断上端縁に沿って、複数のローラーに円滑に案内され、揺れたり断続的になることなく円滑で安全に上方から下方に向かって自走により降下移動する。
【００２５】
なお、上述のように貯槽１の側板２の外側にゴンドラ装置３を自走可能に懸架して、貯槽１の外側から内側に向けて切断作業を行った場合は、切断火花や切断片等は貯槽１内部に向けて落ち、貯槽１外部周辺に切断火花等が飛散することがないため、例え貯槽１の周囲に他の設備等が隣接していても、より安全な解体作業を行うことができる。
【００２６】
図２及び図３のゴンドラ装置３は、吊り架構１２と吊り下げ装置１６を一体に設けた吊り装置兼用のゴンドラ装置３の場合を示す。この吊り下げ装置１６は、ゴンドラ装置３の支持架構本体６の上部から貯槽１内方に向けて延出する吊り架構１２を設け、この吊り架構１２に、例えば、複数の滑車１４，１４を設けてワイヤ１３，１３を索架し、このワイヤ１３，１３を巻き揚げる索引機１５を作業足場４上に設けて形成した場合を示す。この吊り下げ装置１６を使用して、上述の切断した側板部５の吊り下げ降下撤去を行う。なお、この吊り下げ装置１６は、図３に示すような電動式、或は手動式の巻揚げ機１７を使用してもよい。
【００２７】
上述のような吊り装置兼用のゴンドラ装置３を使用して、図２の斜線又は図３の一点鎖線で示すように予め側板部５を吊り下げ保持した状態で側板部５の切断作業を行い、次いで、図２の二点鎖線又は図３の実線で示すように上記吊り下げ装置１６を操作し、側板部５を貯槽１内部に吊り下げ降下撤去する。続いて、ゴンドラ装置３を次に切断する側板部５に向けて所定長だけ移動し、順次連続してこれら一連の作業を継続する。このように、吊り下げ保持と吊り下げ降下の作業は、吊り下げ保持するための装置や、吊り下げ降下するための装置などを別個に設ける必要がなく、この吊り装置兼用のゴンドラ装置３を使って連続して作業能率良く円滑に行うことができる。
【００２８】
なお、切断する側板部５は、切断時に予め吊り下げ保持されているため安定性が保たれ安全であり、また、切断後の側板部５を吊り下げ支持した状態のゴンドラ装置３は、貯槽１の外側の作業足場４等の重量と、反対側に位置する貯槽１内側の切断側板部５の重量との間で、重量のバランスが得られるため傾いたり不安定になる心配がない。
【００２９】
【発明の効果】
叙述のように、請求項１記載の発明に係る円筒形貯槽の解体用ゴンドラ装置は、型鋼材等を矩形立体格子状に組枠して形成した支持架構本体と、この支持架構本体の両側から垂直上方向に延出するアームの上部に設けたローラーよりなり、側板上端縁の所定範囲に自走可能に懸架するガイド装置とを備えているので、構造が簡単で、自走させる操作が容易で、移動が円滑で安定し、かつ外れる心配がなく安全である。
【００３０】
また、螺旋状切断の始端段差部に懸架した上記ゴンドラ装置は、螺旋状の傾斜角度を変化させた場合でも、上記アームの伸縮調整によって容易に作業足場を水平に調整できるため、支持架構本体中央部に設けた作業足場は移動によって傾斜することなく常に水平状態が維持されて、安全な作業用移動足場として使用することができる。
【００３１】
また、上記ゴンドラ装置の支持架構本体の上部に、切断時は側板部を吊り下げ保持し、切断後は側板部を吊り下げ降下する吊り架構と吊り下げ装置を設けて、吊り装置兼用の移動足場としたので、別個に吊り装置を必要とすることなく、また、予め吊り下げ保持した状態で側板部を切断するため、切断の際の安定性が確保され安全である。また、切断側板部を吊り下げてその重量を支持した状態のゴンドラ装置は、作業足場と切断側板部との間で重量のバランスが得られるため、不安定になることがない。
【００３２】
また、切断作業と連携させて吊り下げ保持と吊り下げ降下撤去等の一連の作業を行うため、作業能率良く解体作業を施工することができる。
【００３３】
請求項２記載の発明に係る円筒形貯槽の解体工法は、上記請求項１記載の円筒形貯槽の解体用ゴンドラ装置を解体する貯槽の側板上端縁の所定範囲に螺旋状に傾斜して走行するように自走可能に懸架し、この自走可能なゴンドラ装置に作業足場を水平維持形成し、この作業足場を利用して、所定長の側板上部を吊り下げ保持した状態で螺旋状に部分切断し、この部分切断した側板部を吊り下げ降下撤去し、この切断した螺旋状の側板上端縁の所定範囲を走行用のガイドに使用しゴンドラ装置を自走させて移動しながら、順次貯槽側板を螺旋状に連続して解体していくので、ゴンドラ装置が傾斜する側板上端縁の所定範囲を傾斜方向に自走するにも拘らず、作業足場は常に水平に維持されるため、切断作業が安全に行われ、作業能率良く、解体施工を短期間に行うことができる。
【００３４】
また、ゴンドラ装置が移動する際にも、傾斜した螺旋状の側板上端縁に沿って連続して装置自体の重量とローラーにより自走させて降下移動するために、別個に駆動装置を必要とすることなく移動作業も容易である。また、螺旋状の切断始端位置の段差部に掛け渡してゴンドラ装置を設けているため、ゴンドラ装置は段差部に遮られて所定長以上に移動や暴走する心配もなく安全性が保たれる。
【００３５】
また、螺旋状方向にゴンドラ装置を連続移動しながら解体作業を行うため、作業が連続し円滑でやり易く、かつ上下位置に作業が重複しないので作業の安全性が図れる。また、作業足場を固定するための治具等の仮設、解体撤去などの繁雑な作業がないので、作業能率良くかつ安全に移動して解体作業ができる。
【００３６】
上述のように、請求項２記載の発明に係る円筒形貯槽の解体工法は、解体する貯槽周壁の全周に亙って大掛かりで繁雑な総足場を仮設する必要がない。また、解体用の大型機械装置を常設する必要がないので、仮設機材の費用が少ない上、作業能率が良く解体施工が短期間にできる。また、貯槽の全周に亙って広い作業場所を必要としない。なお、上記側板の切断作業は、貯槽の外側にゴンドラ装置を懸架して貯槽の外側から行った場合は、切断火花等は貯槽内部に落ちて貯槽外部の周辺に飛散することがないため、例え周囲に他の設備等が隣接していても、安全な切断解体撤去作業を行うことができる。
【００３７】
【図面の簡単な説明】
【図１】この発明に係る円筒形貯槽の解体用ゴンドラ装置とこのゴンドラ装置を使用する解体工法の実施形態例の概要を示す正面説明図である。
【図２】この発明に係る円筒形貯槽の解体用ゴンドラ装置の実施形態例を示す正面説明図である。
【図３】この発明に係る円筒形貯槽の解体用ゴンドラ装置の一部を省略して示す側断面概略説明図である。
【符号の説明】
１貯槽
２側板
３ゴンドラ装置
４作業足場
５側板部
６支持架構本体
７，７Ａ，７Ｂアーム
８，８Ａ，８Ｂガイド装置
９，９Ａ，９Ｂ上端ローラー
１０，１０Ａ，１０Ｂ側面ローラー
１１，１１Ａ，１１Ｂサイドローラー
１２吊り架構
１３ワイヤ
１４滑車
１５索引機
１６吊り下げ装置
１７巻揚げ機[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gondola apparatus for disassembling a large-sized storage tank having a steel cylindrical side plate peripheral wall, for example, a cylindrical storage tank for storing gasoline, crude oil, and the like, and a dismantling method using the gondola apparatus .
[0002]
[Prior art]
A large storage tank having a steel cylindrical side plate peripheral wall needs to be dismantled for safety after a long period of time after construction. In addition, there is a need for rebuilding and dismantling due to changes in storage tank usage and location conditions.
[0003]
When disassembling these storage tanks, as the first general dismantling method of the conventional dismantling method, illustration is omitted, but first, a total scaffold is temporarily installed on the entire outer periphery of the side wall of the cylindrical storage tank, Then, the worker cuts the side plate peripheral wall by gas cutting or the like to block it, descends the blocked side plate peripheral wall with a heavy machine such as a suspension device or crane, and repeatedly disassembles from the high place toward the lower part, The temporary scaffolds are temporarily dismantled and removed according to this dismantling work.
[0004]
In addition, as the second conventional dismantling method, although not shown in the figure, a cutting step of sequentially cutting the peripheral wall to a predetermined width along a spiral line from the top of the peripheral wall on a crane or the like, and cutting After the process or in parallel with this, the elongated cutting band continuous in a spiral shape from the upper peripheral wall of the cut part is sequentially lowered downward, and the continuous elongated cutting band at a predetermined position on the ground is formed into a strip having a predetermined length. It is a method of dismantling the surrounding wall as if peeling the apple skin by the cutting process.
[0005]
[Problems to be solved by the invention]
However, in the first general conventional dismantling method as described above, the total scaffolding must be temporarily installed over the entire circumference of the storage tank to be dismantled, and the side plate peripheral wall must be cut and dismantled. Complicated scaffolding with a large number of members is required, assembly and temporary work of the total scaffolding and dismantling / removing work are complicated, time-consuming work is required to be reduced, work of dismantling the peripheral wall of the tank and dismantling / removing work of the scaffolding, etc. Because of this, considerable consideration was required for work safety.
[0006]
In addition, the conventional dismantling method that cuts like the second apple skinning requires a large area where heavy equipment such as cranes moves around the entire circumference of the storage tank when cutting work on a crane or the like. If the surroundings are narrow or if other equipment is adjacent to the surroundings, the construction will be difficult, the cost will be high because the crane etc. will be resident, and the unstable cutting work on the crane etc. Therefore, there are problems of safety, and it takes time and effort to cut the cutting band into an elongated width that can be pulled down to the ground, and the work of extending and lowering it is difficult and the work efficiency is reduced.
[0007]
The present invention has been made in view of the above-described problems of the prior art, and is a large scale over the entire circumference of the peripheral wall of the tank to be dismantled, and it is not necessary to temporarily set up a total scaffold that is complicated to assemble and dismantle. The side plate of the storage tank to be dismantled so that there is no need for a large place for moving heavy equipment such as cranes all around the storage tank, there is no unstable work on heavy equipment such as cranes, and work efficiency is not reduced. A gondola device that can move along the spiral direction is suspended at the upper edge, and a working scaffold is formed horizontally on this gondola device, and the side plate of the storage tank is continuously connected from the top using this working scaffold. The present invention provides a gondola device that can be partly cut in a spiral shape, and then suspended and removed to perform efficient and safe dismantling, and a method for dismantling a cylindrical storage tank using the gondola device .
[0008]
[Means for Solving the Problems]
A gondola device for disassembling a cylindrical storage tank according to a first aspect of the present invention includes a support frame body formed by assembling shaped steel materials or the like in a rectangular three-dimensional grid, and extending vertically upward on both sides of the support frame body Arm, a guide device provided with a roller provided on the upper part of the arm so as to be able to run on a predetermined range of the starting step of the spiral cutting, and a support frame main body framed in the rectangular solid lattice shape. It is provided with a work platform that can be maintained and adjusted horizontally, provided in the center, and has a simple structure, smooth and stable self-propelled movement, easy operation, and a safe moving platform for work.
[0009]
The cylindrical storage tank dismantling gondola device suspends and holds the side plate on the upper part of the supporting frame body during the cutting operation, and suspends and drops the separated side plate after the cutting operation. There is no need to provide a suspension device, separate suspension holding and suspension devices, etc., and a series of operations for removing and removing suspensions can be performed smoothly and efficiently in conjunction with cutting work, and the gondola device and side plate part Thus, the above-described series of operations can be safely performed while stably supporting and maintaining the mutual weights of the mobile device.
[0010]
The method for disassembling a cylindrical storage tank according to the invention described in claim 2 runs in a spiral manner in a predetermined range of the upper edge of the side plate of the storage tank for disassembling the gondola device for disassembly of the cylindrical storage tank according to claim 1. Suspend so that it can be self-propelled, and a working scaffold is formed horizontally on this self-propelled gondola device. Using this work scaffold, the upper part of the side plate of a predetermined length is suspended and held in a spiral shape. Then, the side plate part that has been partially cut is suspended and removed, and then the gondola device is moved along the upper end edge of the spiral side plate that has been cut, and then moved downward by a predetermined length for partial cutting. Continuously along the spiral from the top to the bottom by repeating the suspension holding of the long side plate part, the partial cutting in the suspension holding state, the suspension descent removal and the self-propelled descent movement of the gondola device Is the construction method to dismantle In complicated total scaffolding, wide work locations around the reservoir, without the need for such large-scale machinery equipment, to work efficiently a short period of time, and is intended to safely construction.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An outline of one embodiment of a cylindrical storage tank dismantling gondola device and a dismantling method using the gondola device according to the present invention will be described with reference to FIGS. The illustrated storage tank 1 is formed in a bottomed upright cylindrical shape having a steel side plate 2.
[0012]
As shown in FIG. 1, when disassembling the side plate 2 of the storage tank 1, a gondola device 3 having a work scaffold 4 for disassembling work is suspended on the upper edge of the side plate 2 so as to be able to run. Along the working platform 4 of the gondola device 3, the side plate 5 of a predetermined length on the side plate 2 while the gondola device 3 is suspended is suspended and held in advance, along the circumferential spiral. Partially cut. After the cutting operation is completed, the weight of the separated side plate portion 5 is suspended and supported, and then lowered to the inner side of the storage tank 1 opposite to the suspension side of the gondola device 3 and removed. Next, the cut edge of the side plate 2 is used as a guide rail for traveling, and the gondola device 3 is moved along the inclined spiral shape by using its own weight and the inclination angle of the upper end portion of the spiral side plate. The side plate 2 is sequentially moved downward from the upper side of the storage tank 1 along the alternate long and short dash line of FIG. 1 while sequentially repeating the cutting and removal of the side plate 2 every predetermined width again. Dismantling.
[0013]
The gondola device 3 uses a mold steel material, a pipe material, or the like, or a combination thereof, and forms a support frame main body 6 by forming a frame in a rectangular solid lattice shape. A work scaffold 4 is provided inside the center of the support frame body 6. This work scaffold 4 is formed on a horizontal floor surface with a width of, for example, about 0.3 to 2 meters and a length of about 1 to 6 meters so that an operator can get on the upper part and perform cutting work. To do. Also, arms 7A and 7B extending vertically upward from both sides of the support frame body 6 are provided, and guide devices 8A and 8B for engaging and guiding the upper edge of the side plate 2 are provided at the distal ends of the arms 7A and 7B. The arms 7A and 7B are formed by, for example, a structure that slides with a double pipe or the like such as a pipe material, expands and contracts with a jack or a rack with screws, adjusts to a predetermined length position, and fixes with a set screw or the like. The scaffold 4 is always kept horizontal.
[0014]
When the side surface of the gondola device 3 that faces the support frame main body 6 and the side plate 2 of the work scaffold 4 is curved in an arc shape so as to match the curvature of the side plate 2, the side plate 2 has a large bend. When the length of the gondola device 3 is long, a large gap is not generated between the gondola device 3 and the side plate 2, and there is a fear that an object will fall from this gap or that an operator may get a foot caught in the gap. There is no safety. In addition, since the side surface of the gondola device 3 is parallel to the side plate 2, the side surface of the gondola device 3 is not locally applied to the side plate 2 when the gondola device 3 moves by itself. Smooth and safe movement without friction.
[0015]
Using the work scaffold 4 of the gondola device 3, as shown by the oblique lines in FIG. 1, the first round from the start of cutting of the side plate 2 of the storage tank 1 is spirally inclined at a predetermined angle from the upper edge of the horizontal side plate 1. Along the cutting, the cutting height is gradually increased. At this time, the arm 7A in front of the gondola device 3 is gradually extended by this height increase so that the work scaffold 4 maintains a horizontal state.
[0016]
Although not shown, in the case of a storage tank having a wind girder on the upper outer periphery of the side plate, the girder device 3 is used without using the gondola device 3 and the operator rides on the work scaffold to You may make it perform the cutting | disconnection of the circumference. Further, the first round of cutting may be performed without using the gondola device 3 even when a corridor on the outer periphery of the upper part of the roof can be used or when a crane or the like can be temporarily used.
[0017]
Next, from the second round, as shown in FIG. 1 and FIG. 2, the starting end portion of the cut portion where the upper and lower steps are formed becomes a spiral shape that is inclined at a predetermined angle at both upper and lower side plate 2 upper end edges. 3 is used in a state where the degree of expansion / contraction of the arms 7A and 7B is fixed.
[0018]
It should be noted that the cutting height, that is, the cutting height, that is, the cutting angle, that is, the cutting angle, may be gradually increased or decreased from the upper side to the lower side to change the cutting amount. For example, in order to increase the safety of work in the upper high position, the size and weight to be cut in order to reduce the size to cut and reduce the weight, and to increase the work efficiency as going to the lower low position May be increased. In this case, the arm 7A in front of the gondola device 3 is gradually extended as it goes downward, and the gondola device 3 is moved downward while constantly maintaining the horizontal state of the work scaffold 4. .
[0019]
The guide devices 8A and 8B provided at the distal ends of the arms 7A and 7B will be described with reference to FIGS. The guide devices 8A and 8B are formed of upper end rollers 9A and 9B and side rollers 10A and 10B that are rotatably mounted, and the side plate part 5 to be cut is an intermediate part at the step part at the starting end position to be cut in a spiral shape. Engage across the bridge. The upper end rollers 9A and 9B support the dead weight of the gondola device 3 and the loaded load at the time of operation, and are attached in contact with the upper end edge of the side plate 2 so as to rotate smoothly without being removed. Further, the side rollers 10A and 10B are extended from the axis of the upper end rollers 9A and 9B so that the gondola device 3 is not separated from the side plate 2, beyond the upper end edge of the side plate 2 and on the opposite side to the gondola device 3. It attaches so that it may contact | abut to a side surface strongly from the internal direction of the storage tank 1 located, and may rotate in the direction parallel to a spiral direction.
[0020]
Further, the side rollers 11A and 11B are attached to the lower side surface portion of the support frame main body 6 of the gondola device 3 so as to contact the side surface of the side plate 2 and rotate in a direction parallel to the spiral direction.
The side rollers 11A and 11B allow the gondola device 3 to move smoothly along the side plate 2 without receiving frictional resistance.
[0021]
The gondola device 3 suspended as described above has the inclined cut upper end edge of the side plate 2 as a guide rail for traveling, and each of the above-mentioned weights by its own weight from the upper side to the lower side along the side surface of the side plate 2. By smoothly rotating the roller, it is not necessary to provide a separate drive device, and the roller can be moved down and moved easily.
[0022]
Further, since the gondola device 3 is suspended in a state where the upper end rollers 9A and 9B are stretched over the stepped portion at the spiral cutting start position, the rear upper end roller 9B is blocked by the stepped portion, so that the gondola device 3 There is no fear of moving or running out of control over a predetermined length, and safety is maintained during the moving operation.
[0023]
Although not shown in the figure, the gondola device 3 has a structure in which the rotation of the upper end roller 9 is directly stopped or the upper end roller 9 so as to stop without moving during the cutting operation and to release the stop during the self-running movement. A stop mechanism such as a structure that hinders the traveling of the vehicle and a release mechanism thereof are provided.
[0024]
The gondola apparatus 3 formed in this way is smoothly guided by a plurality of rollers along the inclined spiral cutting upper edge of the side plate 2 while maintaining the work scaffold 4 in a horizontal state, and swings or intermittently. It moves smoothly and safely from the top to the bottom without moving.
[0025]
As described above, when the gondola device 3 is suspended on the outside of the side plate 2 of the storage tank 1 so as to be able to run on its own and the cutting operation is performed from the outside of the storage tank 1 to the inside, Since it does not fall toward the inside of the storage tank 1 and the sparks are not scattered around the outside of the storage tank 1, even if other equipment is adjacent to the periphery of the storage tank 1, it is possible to perform safer dismantling work. it can.
[0026]
The gondola device 3 in FIGS. 2 and 3 shows a case of the gondola device 3 that also serves as a suspension device in which the suspension frame 12 and the suspension device 16 are integrally provided. The suspension device 16 is provided with a suspension frame 12 extending from the upper portion of the support frame body 6 of the gondola device 3 toward the inside of the storage tank 1, and the suspension frame 12 is provided with, for example, a plurality of pulleys 14, 14. In this example, the wires 13 and 13 are laid and the indexing machine 15 for winding the wires 13 and 13 is provided on the work scaffold 4. Using this suspending device 16, the above-mentioned cut side plate portion 5 is suspended and removed. The suspension device 16 may use an electric or manual hoisting machine 17 as shown in FIG.
[0027]
Using the gondola device 3 also serving as a suspension device as described above, the side plate portion 5 is cut and held in a state where the side plate portion 5 is suspended and held in advance as shown by the oblique lines in FIG. 2 or the one-dot chain line in FIG. Next, as shown by the two-dot chain line in FIG. 2 or the solid line in FIG. 3, the suspension device 16 is operated to suspend and remove the side plate portion 5 inside the storage tank 1. Subsequently, the gondola device 3 is moved by a predetermined length toward the side plate portion 5 to be cut next, and these series of operations are continued successively. As described above, the suspension holding and descent operations do not require a separate device for hanging and holding, a device for hanging and dropping, and the like. Can be carried out continuously and efficiently.
[0028]
The side plate part 5 to be cut is suspended and held in advance at the time of cutting, so that the stability is maintained and safe, and the gondola device 3 in a state of supporting the suspended side plate part 5 by hanging is the storage tank 1. Since the weight balance is obtained between the weight of the outer working scaffold 4 and the like and the weight of the cut-side plate portion 5 inside the storage tank 1 located on the opposite side, there is no fear of tilting or becoming unstable.
[0029]
【The invention's effect】
As described above, the dismantling gondola device for the cylindrical storage tank according to the first aspect of the present invention includes a support frame body formed by assembling mold steel materials in a rectangular three-dimensional grid, and both sides of the support frame body. It consists of a roller provided on the upper part of the arm that extends vertically upward, and is equipped with a guide device that can be suspended in a predetermined range on the upper edge of the side plate, so that the structure is simple and the operation for self-propelling is easy. Therefore, the movement is smooth and stable, and there is no worry of coming off and it is safe.
[0030]
In addition, the above-mentioned gondola device suspended on the stepped end portion of the helical cutting can easily adjust the work scaffold horizontally by adjusting the expansion and contraction of the arm even when the helical inclination angle is changed. The working scaffold provided in the section is always maintained in a horizontal state without being tilted by movement, and can be used as a safe working moving scaffold.
[0031]
In addition, a suspension scaffold and a suspension device are provided on the upper part of the support frame body of the gondola device so that the side plate portion is suspended and held at the time of cutting and the side plate portion is suspended and lowered after the cutting. Therefore , the side plate portion is cut without requiring a separate suspension device and in a state of being suspended and held in advance, so that stability at the time of cutting is ensured and safe. In addition, the gondola device in a state where the cutting side plate portion is suspended and the weight thereof is supported is not unstable because the weight balance is obtained between the work scaffold and the cutting side plate portion.
[0032]
In addition, since a series of operations such as suspension holding and suspension descent removal are performed in cooperation with the cutting operation, the dismantling operation can be performed with high work efficiency.
[0033]
The method for disassembling a cylindrical storage tank according to the invention described in claim 2 runs in a spiral manner in a predetermined range of the upper edge of the side plate of the storage tank for disassembling the gondola device for disassembly of the cylindrical storage tank according to claim 1. Suspend so that it can be self-propelled, and a working scaffold is formed horizontally on this self-propelled gondola device. Using this work scaffold, the upper part of the side plate of a predetermined length is suspended and held in a spiral shape. Then, the partially cut side plate portion is suspended and removed, and a predetermined range of the upper edge of the cut spiral side plate is used as a traveling guide, and the gondola device is moved by itself to move the storage tank side plate sequentially. Since the work is continuously disassembled in a spiral shape, the work platform is always kept horizontal even though the gondola device is self-propelled in the inclined direction within the predetermined range of the upper edge of the side plate where the side is inclined. Done efficiently, dismantling It is possible to perform a factory in a short period of time.
[0034]
Also, when the gondola device moves, a separate drive device is required to move down and move by the weight of the device itself and a roller continuously along the upper edge of the inclined spiral side plate. The moving work is also easy without any problems. In addition, since the gondola device is provided over the stepped portion at the spiral cutting start position, the gondola device is shielded by the stepped portion, and safety is maintained without fear of moving or running away beyond a predetermined length.
[0035]
Further, since the disassembly work is performed while continuously moving the gondola device in the spiral direction, the work is continuous and smooth and easy, and the work is not overlapped in the vertical position, so that the work safety can be achieved. In addition, since there is no complicated work such as temporary installation of a jig or the like for fixing the work scaffold and dismantling and removal, the dismantling work can be performed efficiently and safely.
[0036]
As described above, the dismantling method for the cylindrical storage tank according to the invention described in claim 2 does not require a temporary and complicated total scaffolding over the entire circumference of the peripheral wall of the storage tank to be disassembled. In addition, since there is no need to permanently install a large machine for dismantling, the cost of temporary equipment is low, the work efficiency is good, and dismantling can be done in a short time. In addition, there is no need for a large work area over the entire circumference of the storage tank. Note that when the above-mentioned side plate cutting operation is performed from outside the storage tank with a gondola device suspended outside the storage tank, cutting sparks etc. will not fall inside the storage tank and scatter around the outside of the storage tank. Even if other equipment is adjacent to the surroundings, safe cutting and dismantling work can be performed.
[0037]
[Brief description of the drawings]
FIG. 1 is an explanatory front view showing an outline of an embodiment of a gondola device for dismantling a cylindrical storage tank and a dismantling method using the gondola device according to the present invention.
FIG. 2 is an explanatory front view showing an embodiment of a gondola device for dismantling a cylindrical storage tank according to the present invention.
FIG. 3 is a schematic side sectional explanatory view showing a cylindrical storage tank dismantling gondola device according to the present invention with a part thereof omitted.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage tank 2 Side plate 3 Gondola device 4 Working scaffold 5 Side plate part 6 Support frame main body 7, 7A, 7B Arm 8, 8A, 8B Guide device 9, 9A, 9B Upper end roller 10, 10A, 10B Side roller 11, 11A, 11B Side Roller 12 Suspension frame 13 Wire 14 Pulley 15 Indexing machine 16 Suspension device 17 Lifter

Claims

The gondola device used for dismantling the cylindrical storage tank is composed of a supporting frame body formed by assembling shaped steel materials in a rectangular three-dimensional grid, arms extending vertically upward on both sides of the supporting frame body, and this arm A guide device provided by suspending a roller provided on the upper end of the spiral cutting so as to be capable of self-propelling in a predetermined range of the stepped end portion of the spiral cutting, and a horizontal provided in the central portion of the support frame main body framed in the rectangular three-dimensional lattice shape. A work scaffold that can be maintained and adjusted , and a suspension frame and a suspension device that suspends and holds the side plate when cutting and suspends and lowers the side plate after cutting. Gondola device for dismantling the cylindrical storage tank .

The gondola device for disassembling a cylindrical storage tank according to claim 1 is suspended so as to be able to run in a spiral manner within a predetermined range of the upper edge of the side plate of the storage tank to be disassembled, and this self-propelled gondola device The working scaffold is maintained horizontally, and using this working scaffold, the upper part of the side plate of a predetermined length is suspended and held in a spiral shape, and the partially cut side plate part is suspended and removed. The gondola device moves along the upper edge of the cut spiral side plate by a predetermined length to move, and the side plate portion of the predetermined length is suspended and held, partially cut, suspended and removed, and the gondola device is self-propelled. A dismantling method for a cylindrical storage tank, wherein the dismantling method is performed using the above-mentioned gondola device continuously and spirally from the top to the bottom by sequentially repeating the movement.