JP4197833B2 - Steel welding and press-fitting equipment and welding and press-fitting methods - Google Patents

Steel welding and press-fitting equipment and welding and press-fitting methods Download PDF

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JP4197833B2
JP4197833B2 JP2000229645A JP2000229645A JP4197833B2 JP 4197833 B2 JP4197833 B2 JP 4197833B2 JP 2000229645 A JP2000229645 A JP 2000229645A JP 2000229645 A JP2000229645 A JP 2000229645A JP 4197833 B2 JP4197833 B2 JP 4197833B2
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steel member
press
welding
fitting
steel
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JP2002038478A (en
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章 梅国
秀雄 佐藤
春夫 星野
敏明 土屋
貴司 松丸
雅典 護
潔士 金山
和義 渡辺
勇 矢作
充 藤井
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Takenaka Corp
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Takenaka Corp
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Description

【0001】
【発明の属する技術分野】
この発明は、空間的制限、特に上方の構造体により高さ制限を受ける場所において、単位長さの鋼製部材を順次溶接して地盤へ圧入する装置および溶接・圧入工法の技術分野に属する。
【0002】
【従来の技術】
従来、鉄道橋や道路橋、或いは一般の既存建築物の改修・補強などで使用される鋼管杭等の鋼製部材は、上方の空間的制約のため部材長を一定の単位長さに短尺化して施工されるので、主に溶接により鋼製部材同士の接合を行い、油圧ジャッキ等の圧入装置を使用して地盤中へ圧入する圧入工法が実施されている。
【0003】
圧入装置を使用する従来の圧入工法を図11に示す。上部構造Bに反力をとった油圧ジャッキJを使用して最初の鋼製部材Wを圧入し、この鋼製部材Wの上に次の鋼製部材Wを積み重ねて接合部Kを溶接し、更に圧入を進める。そして、油圧ジャッキJのストロークが最大となった段階からは、順次スペーサSを継ぎ足して圧入を所望の深度まで行うのである。
【0004】
【発明が解決しようとする課題】
上述した鋼製部材の圧入装置を使用する圧入工法においては、次のような問題点がある。
【0005】
(a)鉄道橋や道路橋、或いは一般の既存建築物の改修・補強などで使用される鋼製部材は、上方に既存構造物があって高さ制限を受ける場合、上方の作業空間が制約され、必然的に部材長Lが一定の単位長さに短尺化されるので、接合部の数が多くなり、溶接作業のために工期が長くなる。
【0006】
(b)鋼製部材の接合は主に溶接で行われているが、溶接作業の回数を減らすためには、できるだけ部材長Lを長尺化した方が有利である。そのため鋼製部材同士の接合位置H(地上高さ)は極力低く抑えられるので、作業姿勢などの作業環境が厳しくなり、品質管理が非常に困難になる。
【0007】
(c)上方の既存構造物Bまたは既存構造物に取り付けた部材を反力として使用する場合には、既存構造物Bの下に油圧ジャッキJを取り付けて施工するので、油圧ジャッキの長さ分だけ、部材長Lが更に短尺化され、接合部の数が多くなる。
【0008】
(d)圧入工程においては、油圧ジャッキのストロークの限界から、ジャッキストロークが最大となった後は、複数の圧入用スペーサを順次継ぎ足しながら圧入する必要があり、圧入工程および溶接接合工程ともに空間的制約がない場合に比して大幅に工数と工期が増大する。
【0009】
(e)溶接接合作業と圧入作業を交互に行う必要があるため、作業が交錯し、工程が長期化すると共に作業効率が上がらず、不合理な作業が行われていた。
【0010】
(f)溶接接合作業は、一般的には溶接工によるアーク溶接法により行われている。省力化のために溶接ロボットを使用する場合もあるが、溶接ロボットもアーク溶接部分のみを行うので接合作業の工期はあまり改善されず、工事全体の工期短縮にはあまり寄与しない。
【0011】
本発明の目的は、上述した従来技術の問題点を解決すること、即ち、上方に存在する既存構造物などにより空間的制約を受ける場所で、一定の単位長さに製作された鋼製部材の溶接工程と圧入工程を、両方の工程に共通に使用でき段取り替えを要しないで速やかに合理的に連続施工できる溶接・圧入装置と、同装置を使用して実施する溶接・圧入工法を提供することである。
【0012】
【課題を解決するための手段】
上記課題を解決するための手段として、請求項1に記載した発明に係る鋼製部材の溶接・圧入装置は、
平面方向に見ると一辺を開放された略コ字形状とされた剛性フレーム1の底面にキャスタ4を取り付けて移動可能とされた可動フレーム体に下記の構成要素を搭載して構成され、上方の上部構造体Bにより高さ制限を受ける場所で使用される装置であり、
前記略コ字形状の剛性フレーム1において相対向する腕部の内側面にそれぞれガイド2、3が上下方向に設けられ、鋼製部材Wを把持する上下に一対をなす環状のクランプ機構10、20が前記ガイド2、3に沿って昇降可能に配置されており、
前記上下一対をなすクランプ機構10、20はそれぞれ、鋼製部材Wの外周を包囲する環体を二分したに等しい半環状の固定部11、21と可動部12、22の組み合わせで構成され、固定部11、21は上記相対峙する二つのガイド2、3に支持され案内される構成で、前記略コ字形状とされた剛性フレーム1の開放された辺側に位置する可動部12、22はその一端を固定部11、21の一端へ回転自在にピン13、23にて止められ、他端は同じ固定部11、21の他端へ着脱自在なピン14、24で開閉自在に取り付けられており、この上下一対をなす環状のクランプ機構10、20には包囲した鋼製部材Wを掴み又は解放するクランプ用油圧ジャッキ15、25が複数内向きに設置されており、
前記上下一対をなすクランプ機構10、20の間に、同一対のクランプ機構10、20を相互に接近させ又は離間させるアプセット用アクチュエータ5が上記ガイド2、3と平行な配置に複数連結され、上位のクランプ機構10において前記アプセット用アクチュエータ5が連結された直上位置ないしその近傍位置に、上方の上部構造体Bに反力をとる反力受け部7が上向きに設けられ、更に前記上下一対のクランプ機構10、20を全体として支持し、上下方向へ移動させる昇降手段6の一端が剛性フレーム1の前記ガイド2、3に取り付けられ、他端は一方のクランプ機構10又は20に連結されており、
上下に積み重ね当接させた二つの鋼製部材W 、W の接合位置Kの上下に近接した位置に接続される溶接用電極8を具備した構成とされ、
単位長さの鋼製部材Wは上下一対のクランプ機構10、20の可動部12、22を開いて横方向に受け入れ、同可動部12、22を閉じ、上記昇降手段6とアプセット用アクチュエータ5を作動させて反力受け部7が上部構造体Bに反力をとり、下位のクランプ機構20で鋼製部材Wを掴ませたクランプ状態にし、アプセット用アクチュエータ5の駆動で鋼製部材Wの圧入を行い、次順位の鋼製部材W も同様に上下一対のクランプ機構10、20の可動部12、22を開いて横方向に受け入れ、同鋼製部材W を先行の鋼製部材W の上に積み重ねて当接させ、上下二つの鋼製部材W 、W それぞれの接合位置Kの近傍に溶接用電極8を接続し、アプセット用アクチュエータ5を作動させて加圧を伴うフラッシュ溶接法で接合し、つづいて反力受け部7で上部構造体Bに反力をとり、下位のクランプ機構20で鋼製部材W を掴ませたクランプ状態にし , アプセット用アクチュエータ5の駆動で鋼製部材の圧入を行うものである。
【0016】
請求項に記載した発明に係る鋼製部材の溶接・圧入工法は、
上記請求項1に記載した鋼製部材の溶接・圧入装置を使用して、上方の上部構造体Bにより高さ制限を受ける場所で、単位長さの鋼製部材Wを順次積み重ね、その接合位置Kを溶接して前記単位長さづ鋼製部材Wを圧入する溶接・圧入工法であって、
上記溶接・圧入装置のクランプ機構10、20の可動部12、22を開いて鋼製部材Wを横方向に受け入れ、同鋼製部材Wを先行の鋼製部材W の上に積み重ねて当接させ、上下二つの鋼製部材W 、W をそれぞれ上下に一対をなすクランプ機構10、20で掴ませたクランプ状態とし、且つ二つの鋼製部材 、W 前記接合位置Kの近傍に溶接用電極8を接続し、この溶接用電極8を通じて鋼製部材 、W の接合位置Kへ大電流を断続的に流すことにより加熱し、アプセット用アクチュエータ5で鋼製部材 、W の接合位置Kを加圧するフラッシュ溶接法で二つの鋼製部材W 、W を接合する段階と、
下に一対をなすクランプ機構10、20をアンクランプ状態とし、上記昇降手段6とアプセット用アクチュエータ5を作動させて、反力受け部7が上方の上部構造体B反力をとり、下位のクランプ機構20で鋼製部材Wを掴ませたクランプ状態として、前記アプセット用アクチュエータ5で下位のクランプ機構20を下向きに駆動して鋼製部材W圧入を行い、更に下位のクランプ機構20をアンクランプ状態にして昇降手段5で一定ストローク引き上げ、再度下位のクランプ機構20で鋼製部材Wを掴ませたクランプ状態とし、前記アプセット用アクチュエータ5の駆動により鋼製部材Wの圧入を行う工程を繰り返して鋼製部材Wの圧入を進める段階とから成る。
【0017】
請求項記載した発明は、請求項に記載した鋼製部材の溶接・圧入工法において、
前記アプセット用アクチュエータ5による鋼製部材Wの圧入は、上下方向に加振しながら圧入を進めることを特徴とする。
【0018】
【発明の実施の形態】
請求項1〜に記載した発明に係る鋼製部材の溶接・圧入装置及び溶接・圧入工法の実施形態を、図1〜図10に基づいて説明する。
【0019】
図1、図2に示す鋼製部材の溶接・圧入装置は、図2のように平面方向に見ると右側部分の一辺が開放されたコ字形状とされた剛性フレーム1の底面にキャスタ4を取付けて移動可能とした可動フレーム体に各構成要素を搭載して構成され、可搬性を有している。前記剛性フレーム1の相対向する腕部の内側面部にガイド2、3が上下方向に設けられており、このガイド2、3に形成されたコ字状のガイド溝に沿って昇降可能に、鋼製部材Wを把持するクランプ手段を備えた上下一対の環状のクランプ機構10、20が配置されている。
【0020】
上位のクランプ機構10と下位のクランプ機構20はそれぞれ、前記一対のガイド2、3により案内される半環状の固定部11、21と、同じく半環状の可動部12、22とから成り、両者は図2に示したように鋼製部材Wの外周を包囲する環体を二分したに等しい形態である。前記可動部12、22はそれぞれの一端を固定ピン13、23により固定部11、21の一端へ回転自在に止めて支持され、他端開閉ピン14、24着脱することにより同じ固定部11、21の他端へ開閉可能に取り付けられている。環状をなす上下のクランプ機構10、20には、鋼製部材Wを掴み又は解放するクランプ用油圧ジャッキ15、25が内向きの求心配置に設置されている。
【0021】
上下一対のクランプ機構10、20の間に、上記ガイド2、3と平行な配置で複数のアプセット用アクチュエータ5、5・・が各々絶縁材を介して連結されている。アプセット用アクチュエータ5は、後述するフラッシュ溶接時に鋼製部材Wの接合部Kを加圧(アプセット)する機能と、その後鋼製部材Wを地盤に圧入する機能を兼ねるものであり、油圧により伸縮動作する油圧式往復形ジャッキが使用されている。但し、アプセット用アクチュエータ5は、記の機能を奏するかぎり、油圧により作動する油圧ジャッキに限らない。変位・加重制御を行うことが可能なアクチュエータであれば良い。図示例の場合、アプセット用アクチュエータ5のシリンダ部5aが上位のクランプ機構10に固定され、ロッド部5bが下位のクランプ機構20に取り付けられているが、上下逆の態様で実施することもできる。前記の各アプセット用アクチュエータ5の直上部位又はその近傍位置であって、上位のクランプ機構10の上面部にそれぞれ反力受け部7が突設されている。但し、反力受け部7は、上部構造体Bの傾きその他の原因でレベルの不統一が発生しても対応できるようにピン機構などで自在状態に取付けて実施することもある。
【0022】
上記構成のアプセット用アクチュエータ5は、アプセット時に必要とされる断面積あたり30〜50N/mmの加圧能力を備えている。例えば、鋼製部材Wの断面積が20000mmであれば、600KN〜1000KNの加圧能力を持つように実施される。このアプセット用アクチュエータ5は、アプセット時に必要な30mm/SECの動作速度を実現する機構とされている。
【0023】
上記したガイド2、3の上部には、シリンダ取り付け部2a、3aが水平な腕状に形成され、油圧により駆動される昇降手段である昇降用シリンダ6のシリンダ上端部が取り付けられている。昇降シリンダ6の出力ロッドの下端部6aは下位のクランプ機構20に取り付けられている。
【0024】
前記上位のクランプ機構10に附属する要素として鋼製部材の接合位置K(図9b)の上下に近接する配置で、後述するフラッシュ溶接時に溶接電流を流すための溶接用電極8、及びこの溶接用電極8に低圧大電流を供給する溶接用トランス9が配設されている(図9)。溶接用トランス9は図示しない電源装置と接続されている。
【0025】
次に、上述のように構成された鋼製部材の圧入装置を用いて実施する溶接・圧入工法を説明する。
【0026】
先ず図3は、溶接・圧入装置へ鋼製部材Wをセットするため、上下一対のクランプ機構10、20の可動部12、22を約180°開き、図示しないクレーンなどの建設機械を使用して吊った鋼製部材Wを、横方向へ移動して溶接・圧入位置へ吊り込み定置する段階を示している。
【0027】
図4は、上下のクランプ機構10、20の可動部12、22を閉じ、昇降用シリンダ6を限度まで収縮動作させて下位のクランプ機構20を引き上げ(上昇させ)、更にアプセット用アクチュエータ5のロッド部5bを伸長作動させて、上位のクランプ機構10と反力受け部7を上昇させ、反力受け部7を上方の上部構造Bへ密着させて反力をとった段階を示している。この段階で、下位のクランプ機構20の複数のクランプ用油圧ジャッキ25(図2参照)を作動させて鋼製部材Wを掴ませクランプ状態とする。
【0028】
図5は、アプセット用アクチュエータ5を下向きに伸長動作させることにより、鋼製部材Wの圧入作業を1ステップ進めた段階を示す。このとき昇降用シリンダ6は遊動状態とする。圧入作業は、静的に行う場合と、アプセット用アクチュエータ5を上下方向に振動させる加振状態で動的に行う場合とがある(請求項記載の発明)。加振しながら圧入作業を行う場合には、圧入するための出力を低減することができる。
【0029】
鋼製部材の圧入作業の1ステップは、アプセット用アクチュエータ5のストロークが最大になるまで行う。しかる後、下位のクランプ機構20のクランプ用油圧ジャッキ25を解放してアンクランプ状態とし、昇降用シリンダ6を上方へ収縮動作させることにより下位のクランプ機構20を上昇させて盛り替えを行う。再度アプセット用アクチュエータ5が最も収縮した状態で、再び下位のクランプ機構20のクランプ用油圧ジャッキ25を作動させて鋼製部材Wをクランプさせ、2ステップ目の圧入作業を行う。こうした圧入作業を数回繰り返すことにより、鋼製部材Wを所定の深さ位置まで圧入する。
【0030】
図6は、次順位の鋼製部材Wをセットするために、上下のクランプ機構10、20を再び開状態とし、接合部Kのフラッシュ溶接に適切なクランプ位置及びアプセット用アクチュエータ5のストロークに調整した後、鋼製部材Wを装置内へ吊り込む段階を示す。図7は、上下のクランプ機構10、20を閉じてセッティングを完了し、上下のクランプ機構10、20のクランプ用油圧ジャツキ15、25で鋼製部材W、Wをクランプ状態とし、鋼製部材Wの所定位置に後述する溶接用電極8(図9参照)を接続してフラッシュ溶接を行う段階を示す。フラッシュ溶接の工程を図9に示した。
【0031】
図9(a)は、上下に対向配置した二つの鋼製部材W、Wをそれぞれ上下のクランプ機構10、20でクランプし、溶接用トランス9に接続された溶接用電極8、8を鋼製部材W、Wの接合部近傍位置に接続した状態を示す。
【0032】
図9(b)は、上下二つの鋼製部材W、Wを積み重ねて当接させ、二つの鋼製部材W、Wを接合部Kで突き合わせ、溶接用トランス9から溶接用電極8、8に大電流を断続的に流し、フラッシュ加熱を行う段階を示している。
【0033】
図9(c)は、アプセット用アクチュエータ5を作動させて二つの鋼製部材W、Wの接合部Kを加圧し、フラッシュ溶接を完成した段階を示す。
【0034】
フラッシュ溶接が終了すると、再び図4で説明した様に、上下のクランプ機構10、20をアンクランプ状態とし、昇降用シリンダ6で下位のクランプ機構20を上限まで上昇させる。次いでアプセット用アクチュエータ5を伸長動作させて、上位のクランプ機構10の反力受け部7が上部構造Bに反力をとる状態にする。そして、図8に示した様に、下部のクランプ機構20で鋼製部材Wをクランプし、圧入工程を開始するのである。
【0035】
その後、必要があれば上述した圧入工程とフラッシュ溶接工程を必要数の鋼製部材について繰り返し、所定長さの鋼管杭などを構築し、圧入作業を完了する。フラッシュ溶接によると、特有のバリが発生するので、外観や構造上このバリが不都合な場合は、上下のクランプ機構10、20の接合面側に取り付けた、図示しないダイス等を用いて切削することも行う。
【0036】
図10は、本発明の溶接・圧入工法と、従来工法による場合の鋼製部材の長さの比較を左右に対比して示す。右側に示す従来工法は、圧入用のジャッキJの長さと、溶接施工可能な接合部Kの下限位置によって鋼製部材の単位長さ(部材長L)を短く制約されている。しかし、左側に示した本発明の工法によれば、鋼製部材の下部を下位のクランプ機構20でクランプして圧入を行い、圧入用アクチュエータ5は鋼製部材と平行に並列配置とされるので、鋼製部材の単位長さLを大きくできる。
【0037】
接合部Kの溶接にフラッシュ溶接を採用しているので、アーク溶接のように溶接技能者が溶接状況を監視する必要は全くなく、自動的に溶接が行われるので、下位のクランプ機構20を地面直前まで下げることが可能となり、鋼製部材の部材長Lを増大することができる。
【0038】
但し、本発明は、上述した実施形態に限定されるものではなく、当業者が通常行う設計、応用の範囲内で様々な実施態様が可能である。例えば、クランプ機構の形状の変更により、鋼製部材の形状は円筒形状だけでなく、H形断面形状や箱形断面形状、或いはコルゲート形部材等、各種の断面形状の鋼製部材にも適用可能なことは勿論である。端部に鋼製部分を有するPC杭などのコンクリート部材にも適用可能である。
【0039】
【発明の効果】
本発明によれば、鋼製部材の溶接・圧入を繰り返す作業において、下記の効果が得られる。
(a)鋼製部材の単位長さを大きくして接合箇所を低減できる。
(b)フラッシュ溶接による溶接時間を低減できる。
(c)溶接・圧入工程における盛り替え作業を省略ないし低減できる。
(d)加振しながら圧入することにより圧入荷重の低減と、杭の場合は支持力を増大することができる。
【図面の簡単な説明】
【図1】 本発明に係る鋼製部材の溶接・圧入装置を示す立面図である。
【図2】 図1のA−A矢視図である。
【図3】 鋼製部材の溶接・圧入装置において鋼製部材をセットする状態を示す説明図である。
【図4】 鋼製部材の溶接・圧入装置においてクランプ機構を閉じた状態を示す説明図である。
【図5】 鋼製部材の溶接・圧入装置において圧入状態を示す説明図である。
【図6】 鋼製部材の溶接・圧入装置において次の鋼製部材をセットする状態を示す説明図である。
【図7】 鋼製部材の溶接・圧入装置においてクランプ機構を閉じた状態を示す説明図である。
【図8】 鋼製部材の溶接・圧入装置によるフラッシュ溶接後の鋼製部材圧入状態を示す説明図である。
【図9】 a、b、cはフラッシュ溶接の工程を示す説明図である。
【図10】 鋼製部材の溶接・圧入工法の効果を説明する比較図である。
【図11】 従来の鋼製部材の圧入工法を示す説明図である。
【符号の説明】
1 フレーム
2、3 ガイド
5 アプセット用アクチュエータ
6 昇降用シリンダ
7 反力受け部
8 溶接用電極
10、20 クランプ機構
11、21 固定部
12 22 可動部
15 25 クランプ用油圧ジャッキ
B 上部構造体
W、 、W 鋼製部材
[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of an apparatus and a welding / press-in method for welding a steel member of a unit length in order and press-fitting into a ground in a place where a space restriction, particularly a height restriction is imposed by an upper structure .
[0002]
[Prior art]
Conventionally, steel members such as steel pipe piles used for the repair and reinforcement of railway bridges, road bridges, or general existing buildings have been shortened to a certain unit length due to the upper spatial constraints. Therefore, a press-fitting method in which steel members are joined mainly by welding and press-fitted into the ground using a press-fitting device such as a hydraulic jack has been implemented.
[0003]
FIG. 11 shows a conventional press-fitting method using a press-fitting device. The first steel member W 1 is press-fitted using a hydraulic jack J which took a reaction force to the upper structure B, and joint K stacking the following steel member W 2 on the steel member W 1 Weld and further press fit. Then, from the stage where the stroke of the hydraulic jack J becomes maximum, the spacers S are sequentially added to perform press-fitting to a desired depth.
[0004]
[Problems to be solved by the invention]
The press-fitting method using the steel member press-fitting device described above has the following problems.
[0005]
(A) When steel members used in railway bridges, road bridges, and general existing buildings are renovated and reinforced, the upper working space is constrained when there is an existing upper structure and the height is restricted. Inevitably, the member length L is shortened to a certain unit length, so that the number of joints increases and the work period becomes longer due to the welding operation.
[0006]
(B) Although joining of steel members is mainly performed by welding, in order to reduce the number of welding operations, it is advantageous to make the member length L as long as possible. Therefore, since the joining position H (height above the ground) between the steel members can be suppressed as low as possible, the working environment such as the working posture becomes severe and quality control becomes very difficult.
[0007]
(C) When the upper structure B or a member attached to the existing structure is used as a reaction force, the hydraulic jack J is installed under the existing structure B. Only the member length L is further shortened and the number of joints is increased.
[0008]
(D) In the press-fitting process, due to the limit of the stroke of the hydraulic jack, after the jack stroke reaches the maximum, it is necessary to press-fit several press-fitting spacers while sequentially adding them. Compared to the case where there are no restrictions, the man-hours and the construction period are greatly increased.
[0009]
(E) Since it is necessary to alternately perform welding joining work and press-fitting work, the work is mixed, the process is prolonged, work efficiency is not improved, and an irrational work is performed.
[0010]
(F) The welding joining work is generally performed by an arc welding method by a welder. In some cases, a welding robot is used for labor saving, but since the welding robot also performs only the arc welding part, the work period of the joining work is not improved so much and the work period of the whole work is not greatly reduced.
[0011]
An object of the present invention is to solve the above-mentioned problems of the prior art , that is, in a place where a steel member manufactured to a certain unit length is subjected to a spatial restriction due to an existing structure existing above . We provide welding and press-fitting methods that can be used in common for both the welding process and press-fitting process, and that can be carried out quickly and reasonably without the need for setup change, and the welding and press-fitting methods that are performed using this equipment. It is to be.
[0012]
[Means for Solving the Problems]
As means for solving the above problems, a welding / press-in apparatus for steel members according to the invention described in claim 1 is:
The following components are mounted on a movable frame body that is movable by attaching a caster 4 to the bottom surface of the rigid frame 1 that is substantially U-shaped with one side open when viewed in the plane direction. It is a device used in a place where the height is restricted by the upper structure B,
In the substantially U-shaped rigid frame 1, guides 2 and 3 are provided in the vertical direction on the inner side surfaces of the opposing arm portions, respectively, and a pair of upper and lower annular clamp mechanisms 10 and 20 that grip the steel member W. Are arranged along the guides 2 and 3 so as to be movable up and down.
Each of the upper and lower clamp mechanisms 10 and 20 is composed of a combination of semi-annular fixed portions 11 and 21 and movable portions 12 and 22 that are equivalent to halves of the ring surrounding the outer periphery of the steel member W. The parts 11 and 21 are supported and guided by the two guides 2 and 3 facing each other, and the movable parts 12 and 22 positioned on the opened side of the substantially U-shaped rigid frame 1 are One end thereof is rotatably fixed to one end of the fixing portions 11 and 21 by pins 13 and 23, and the other end is attached to the other end of the same fixing portions 11 and 21 by detachable pins 14 and 24 so as to be freely opened and closed. In addition, a plurality of clamping hydraulic jacks 15 and 25 for gripping or releasing the enclosed steel member W are installed inward in the annular clamp mechanisms 10 and 20 that form a pair of upper and lower sides,
A plurality of upset actuators 5 for bringing the same pair of clamp mechanisms 10 and 20 closer to or away from each other between the pair of upper and lower clamp mechanisms 10 and 20 are connected in parallel with the guides 2 and 3. In the clamping mechanism 10, a reaction force receiving portion 7 that takes a reaction force on the upper upper structure B is provided upward at a position immediately above or near the position where the upset actuator 5 is coupled, and the pair of upper and lower clamps One end of an elevating means 6 that supports the mechanisms 10 and 20 as a whole and moves in the vertical direction is attached to the guides 2 and 3 of the rigid frame 1, and the other end is connected to one clamp mechanism 10 or 20,
It is configured to include a welding electrode 8 connected to a position close to the top and bottom of the joining position K of the two steel members W 1 and W 2 that are stacked and contacted vertically.
The steel member W having a unit length opens the movable portions 12 and 22 of the pair of upper and lower clamp mechanisms 10 and 20 and receives them in the lateral direction, closes the movable portions 12 and 22, and moves the elevating means 6 and the upset actuator 5 together. The reaction force receiving portion 7 is actuated to exert a reaction force on the upper structure B, and the steel member W is clamped by the lower clamp mechanism 20, and the steel member W is press-fitted by driving the upset actuator 5. was carried out, receiving laterally open movable portion 12 and 22 having the next order of the steel member W 2 similarly a pair of upper and lower clamping mechanisms 10 and 20, the steel member W 1 of the preceding the steel member W 2 The welding electrode 8 is connected in the vicinity of the joint position K between the two upper and lower steel members W 1 and W 2 , and the upset actuator 5 is operated to perform flash welding with pressurization. Joining There are taking a reaction force receiving unit 7 in the reaction force to the upper structure B, the clamped state in which gripped the steel member W 2 in the lower clamping mechanism 20, performing a press-fitting of the steel member by driving the upset actuator 5 Is.
[0016]
The welding / press-in method for steel members according to the invention described in claim 2 is:
Using the steel member welding and press-fitting device according to claim 1, the steel members W of unit length are sequentially stacked at a place where the height is restricted by the upper structure B above, and the joining position thereof by welding a K a welding and press-fit method of press-fitting the unit length Dzu one steel member W,
Accept the steel member W in the transverse direction to open the movable portion 12 and 22 of the clamping mechanism 10, 20 of the welding and the press-fitting device, contact by stacking the steel member W on the steel member W 2 of the prior is allowed, and a clamping state in which the gripped by the clamp mechanism 10, 20 forming a pair up and down two steel member W 1, W 2 and up and down respectively, and the two steel members W 1, W 2 of the joining position K connect the welding electrodes 8 in the vicinity, was heated by passing a high current intermittently to the joining position K of the steel member W 1, W 2 through the welding electrodes 8, the steel member W by upsetting actuator 5 a method of joining two steel member W 1, W 2 in 1, W flash welding method that pressurize joining position K of 2,
A clamping mechanism 10, 20 forming a pair up or down to an unclamped state, by operating the lifting means 6 and upset actuator 5, the reaction force receiving section 7 takes the reaction force above the upper structure B, the lower As a clamped state in which the steel member W is gripped by the clamp mechanism 20, the lower clamp mechanism 20 is driven downward by the upset actuator 5 to press-fit the steel member W , and the lower clamp mechanism 20 is A step of pulling up a fixed stroke by the lifting means 5 in the unclamped state, setting the clamped state in which the steel member W is gripped by the lower clamping mechanism 20 again , and pressing the steel member W by driving the upset actuator 5 is performed . And the step of repeatedly press-fitting the steel member W.
[0017]
The invention described in claim 3 is a method of welding and press-fitting steel members according to claim 2 ,
The press-fitting of the steel member W by upsetting actuator 5, vibration Shinano vertically, characterized in that the advancing et pressure input.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the welding and the press-fitting devices and welding and press-fitting method of a steel member according to the invention described in claim 1 3 will be described with reference to FIGS. 1 to 10.
[0019]
The steel member welding and press-fitting device shown in FIGS. 1 and 2 has a caster 4 on the bottom surface of a rigid frame 1 having a U-shape with one side opened on the right side when viewed in a plane direction as shown in FIG. constructed by mounting each component to the mobile frame which is movable mounted, that have portability. Guides 2 and 3 are provided in the vertical direction on the inner side surfaces of the arm portions facing each other of the rigid frame 1, and can be moved up and down along the U-shaped guide grooves formed in the guides 2 and 3. A pair of upper and lower annular clamping mechanisms 10 and 20 having clamping means for gripping the manufactured member W are disposed.
[0020]
The upper clamp mechanism 10 and the lower clamp mechanism 20 are each composed of semi-annular fixed portions 11 and 21 guided by the pair of guides 2 and 3, and semi-annular movable portions 12 and 22, respectively. As shown in FIG. 2, the ring body surrounding the outer periphery of the steel member W has a form equivalent to a half. The movable portion 12 and 22 is supported by stop rotatably to one end of the fixing portion 11 and 21 respectively at one end by fixing pins 13 and 23, the same fixing unit 11 by the other end to attach and detach the closing pin 14, 24 , Ru Tei attached openably to the other end of 21. In the upper and lower clamping mechanisms 10 and 20 that form an annular shape, hydraulic jacks 15 and 25 for clamping that grip or release the steel member W are installed in an inward centripetal arrangement.
[0021]
A plurality of upset actuators 5, 5,... Are connected between the pair of upper and lower clamp mechanisms 10, 20 in parallel with the guides 2, 3 , via insulating materials. Actuator 5 for upset, which upon flash welding to be described later serves also as a function of pressure (upset) the junction K of the steel member W, then the ability to press fit the steel member W in the ground, the hydraulically hydraulic reciprocating type jack for expansion and contraction is being used. However, the upset actuator 5 as long to achieve the previous SL functions, not limited to the hydraulic jack operated by hydraulic pressure. Any actuator that can perform displacement / weight control may be used. In the case of the illustrated example, the cylinder portion 5a of the upset actuator 5 is fixed to the upper clamp mechanism 10 and the rod portion 5b is attached to the lower clamp mechanism 20, but it can also be implemented in an upside down manner. The reaction force receiving portions 7 project from the upper portion of the upper clamping mechanism 10 at a position immediately above each upset actuator 5 or in the vicinity thereof. However, the reaction force receiving portion 7 may be mounted and implemented in a free state by a pin mechanism or the like so as to be able to cope with level inconsistency due to the inclination of the upper structure B or other causes.
[0022]
The upset actuator 5 configured as described above has a pressurizing capacity of 30 to 50 N / mm 2 per cross-sectional area required at the time of upset. For example, when the cross-sectional area of the steel member W is 20000 mm 2 , the pressing is performed so as to have a pressure capacity of 600 KN to 1000 KN. The upset actuator 5 is a mechanism that realizes an operation speed of 30 mm / SEC required during upset.
[0023]
Cylinder mounting portions 2a and 3a are formed in a horizontal arm shape on the upper part of the guides 2 and 3 described above, and a cylinder upper end portion of a lifting cylinder 6 which is a lifting means driven by hydraulic pressure is attached. The lower end portion 6 a of the output rod of the elevating cylinder 6 is attached to the lower clamping mechanism 20.
[0024]
A welding electrode 8 for passing a welding current at the time of flash welding, which will be described later, in an arrangement close to the top and bottom of the joining position K (FIG. 9b) of the steel member as an element belonging to the upper clamping mechanism 10, and for this welding A welding transformer 9 for supplying a low voltage and large current to the electrode 8 is disposed (FIG. 9). The welding transformer 9 is connected to a power supply device (not shown).
[0025]
Next, the welding and press-fitting method implemented using the steel member press-fitting device configured as described above will be described.
[0026]
First, FIG. 3, for setting the steel member W 1 to the welding-indentation device, the movable portion 12 and 22 of the pair of upper and lower clamping mechanisms 10, 20 open approximately 180 °, using a construction machine such as a crane (not shown) the steel member W 1 that hung Te, moved in the horizontal direction indicates a step to position hanging to the welding-pressed position.
[0027]
FIG. 4 closes the movable parts 12 and 22 of the upper and lower clamp mechanisms 10 and 20, retracts the elevating cylinder 6 to the limit, lifts (raises) the lower clamp mechanism 20, and then rods the upset actuator 5. the part 5b by extending action, the clamping mechanism 10 of the upper increased the reaction force receiving section 7 shows the step of taking the reaction force by intimate contact with the reaction force receiving section 7 above the superstructure B. In this step, the plurality of clamping hydraulic jack 25 clamped thereby grasp the steel member W 1 is actuated (see FIG. 2) of the lower clamping mechanism 20.
[0028]
5, by extending operating the actuator 5 for upsetting downwards, shows the steps of advancing one step press-fitting operation of the steel member W 1. At this time, the elevating cylinder 6 is in a floating state. The press-fitting operation may be performed statically or may be performed dynamically in an oscillating state in which the upset actuator 5 is vibrated in the vertical direction (the invention according to claim 3 ). When the press-fitting operation is performed while vibrating, the output for press-fitting can be reduced.
[0029]
One step of the press-fitting work of the steel member is performed until the stroke of the upset actuator 5 is maximized. Thereafter, the clamping hydraulic jack 25 of the lower clamping mechanism 20 is released to an unclamped state, and the lower clamping mechanism 20 is moved upward by contracting the raising / lowering cylinder 6 to perform reordering. In a state where the upsetting actuator 5 again the most contracted to clamp the steel member W 1 by operating the clamping hydraulic jacks 25 of the lower clamping mechanism 20 again performs the press-fitting work of the second step. By repeating several times this press-fitting operation, press-fitting the steel member W 1 to a predetermined depth position.
[0030]
6, to set the steel member W 2 having the next order, and upper and lower re-opened the clamping mechanism 10 and 20, the appropriate stroke of the clamping position and upset actuator 5 to the flash welding joint K after adjusting shows a stage Komu hanging steel member W 2 into the device. In FIG. 7, the upper and lower clamping mechanisms 10 and 20 are closed to complete the setting, and the steel members W 1 and W 2 are clamped by the clamping hydraulic jacks 15 and 25 of the upper and lower clamping mechanisms 10 and 20 to make the steel. connect the welding electrodes 8 to be described later to a predetermined position of the member W 2 (see FIG. 9) shows a step of performing a flash welding. The flash welding process is shown in FIG.
[0031]
In FIG. 9A, two steel members W 1 and W 2 that are vertically opposed to each other are clamped by upper and lower clamping mechanisms 10 and 20, respectively, and welding electrodes 8 and 8 connected to a welding transformer 9 are connected. showing a state of connecting the junction vicinity of the steel member W 1, W 2.
[0032]
FIG. 9B shows that the two steel members W 1 and W 2 are stacked and brought into contact with each other, the two steel members W 1 and W 2 are butted at the joint K, and the welding transformer 9 to the welding electrode. 8 and 8 show a stage in which a large current is intermittently applied to perform flash heating.
[0033]
FIG. 9C shows a stage where the upsetting actuator 5 is operated to pressurize the joints K of the two steel members W 1 and W 2 to complete flash welding.
[0034]
When the flash welding is finished, as described with reference to FIG. 4 again, the upper and lower clamp mechanisms 10 and 20 are put into an unclamped state, and the lower clamp mechanism 20 is raised to the upper limit by the lifting cylinder 6. Then the actuator 5 for upset by expansion operation, the reaction force receiving portion 7 of the clamping mechanism 10 of the upper to the state taking the reaction force to the upper structure B. Then, as shown in FIG. 8, clamp the steel member W 2 at the bottom of the clamping mechanism 20 is to initiate the stuffing step.
[0035]
Thereafter, if necessary, the press-fitting process and the flash welding process described above are repeated for a required number of steel members, a steel pipe pile having a predetermined length is constructed, and the press-fitting work is completed. When flash welding is used, a specific burr is generated. If this burr is inconvenient in terms of appearance or structure, it is cut using a die (not shown) attached to the joint surface side of the upper and lower clamp mechanisms 10 and 20. Also do.
[0036]
FIG. 10 shows a comparison of the lengths of steel members in the case of using the welding / press-in method according to the present invention and the conventional method in comparison with the left and right. In the conventional method shown on the right side, the unit length (member length L) of the steel member is restricted to be short by the length of the jack J for press-fitting and the lower limit position of the joint portion K that can be welded. However, according to the method of the present invention shown on the left side, the lower part of the steel member is clamped by the lower clamp mechanism 20 to perform press-fitting, and the press-fitting actuator 5 is arranged in parallel with the steel member. The unit length L of the steel member can be increased.
[0037]
Since flash welding is used for welding the joint K, the welding technician does not need to monitor the welding situation as in arc welding, and welding is performed automatically. It can be lowered to just before, and the member length L of the steel member can be increased.
[0038]
However, the present invention is not limited to the above-described embodiments, and various embodiments are possible within the scope of design and application normally performed by those skilled in the art. For example, by changing the shape of the clamp mechanism, the steel member shape can be applied not only to the cylindrical shape but also to steel members with various cross-sectional shapes, such as H-shaped cross-sectional shape, box-shaped cross-sectional shape, or corrugated shape member. Of course. The present invention can also be applied to a concrete member such as a PC pile having a steel portion at the end.
[0039]
【The invention's effect】
According to the present invention, the following effects can be obtained in the operation of repeatedly welding and press-fitting steel members.
(A) The unit length of the steel member can be increased to reduce the number of joints.
(B) The welding time by flash welding can be reduced.
(C) The refilling operation in the welding / pressing process can be omitted or reduced.
(D) By press-fitting while vibrating, the press-fitting load can be reduced, and in the case of a pile, the supporting force can be increased.
[Brief description of the drawings]
FIG. 1 is an elevational view showing a steel member welding and press-fitting device according to the present invention.
FIG. 2 is an AA arrow view of FIG.
FIG. 3 is an explanatory view showing a state in which a steel member is set in a welding / press-in apparatus for a steel member.
FIG. 4 is an explanatory view showing a state in which a clamp mechanism is closed in a welding / press-fitting device for steel members.
FIG. 5 is an explanatory view showing a press-fitted state in a steel member welding / press-fitting device.
FIG. 6 is an explanatory view showing a state in which the next steel member is set in the welding / press-in apparatus for steel members.
FIG. 7 is an explanatory view showing a state in which a clamp mechanism is closed in a welding / press-fitting device for steel members.
FIG. 8 is an explanatory diagram showing a steel member press-fitted state after flash welding by a steel member welding / press-fitting device.
FIGS. 9A, 9B and 9C are explanatory diagrams showing flash welding processes. FIGS.
FIG. 10 is a comparative view for explaining the effect of a welding / press-in method for steel members.
FIG. 11 is an explanatory view showing a conventional method for press-fitting steel members.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Frame 2, 3 Guide 5 Upset actuator 6 Lifting cylinder 7 Reaction force receiving part 8 Welding electrode 10, 20 Clamp mechanism 11, 21 Fixed part 12 22 Movable part 15 25 Hydraulic jack for clamp
B Upper structure W, W 1 , W 2 steel member

Claims (3)

平面方向に見ると一辺を開放された略コ字形状とされた剛性フレームの底面にキャスタを取り付けて移動可能とされた可動フレーム体に下記の構成要素を搭載して構成され、上方の上部構造体により高さ制限を受ける場所で使用される装置であり、
前記略コ字形状の剛性フレームにおいて相対向する腕部の内側面にそれぞれガイドが上下方向に設けられ、鋼製部材を把持する上下に一対をなす環状のクランプ機構が前記ガイドに沿って昇降可能に配置されており、
前記上下一対をなすクランプ機構はそれぞれ、鋼製部材の外周を包囲する環体を二分したに等しい半環状の固定部と可動部の組み合わせで構成され、固定部は上記相対峙する二つのガイドに支持され案内される構成で、前記略コ字形状とされた剛性フレームの開放された辺側に位置する可動部はその一端を固定部の一端へ回転自在にピン止めされ、他端は同じ固定部の他端へ着脱自在なピンで開閉自在に取り付けられており、この上下一対をなす環状のクランプ機構には包囲した鋼製部材を掴み又は解放するクランプ用油圧ジャッキが複数内向きに設置されており、
前記上下一対をなすクランプ機構の間に、同一対のクランプ機構を相互に接近させ又は離間させるアプセット用アクチュエータが上記ガイドと平行な配置に複数連結され、上位のクランプ機構において前記アプセット用アクチュエータが連結された直上位置ないしその近傍位置に、上方の上部構造体に反力をとる反力受け部が上向きに設けられ、更に前記上下一対のクランプ機構を全体として支持し、上下方向へ移動させる昇降手段の一端が剛性フレームの前記ガイドに取り付けられ、他端は一方のクランプ機構に連結されており、
上下に積み重ね当接させた二つの鋼製部材の接合位置の上下に近接した位置に接続される溶接用電極を具備した構成とされ、
単位長さの鋼製部材は上下一対のクランプ機構の可動部を開いて横方向に受け入れ、同可動部を閉じ、上記昇降手段とアプセット用アクチュエータを作動させて反力受け部が上方の上部構造体に反力をとり、下位のクランプ機構で鋼製部材を掴ませたクランプ状態にしてアプセット用アクチュエータの駆動で鋼製部材の圧入を行い、次順位の鋼製部材も同様に上下一対のクランプ機構の可動部を開いて横方向に受け入れ、同鋼製部材を先行の鋼製部材の上に積み重ねて当接させ、上下二つの鋼製部材それぞれの接合位置近傍に溶接用電極を接続し、アプセット用アクチュエータを作動させて加圧を伴うフラッシュ溶接法で接合し、つづいて反力受け部で上部構造体に反力をとり、下位のクランプ機構で鋼製部材を掴ませたクランプ状態にしてアプセット用アクチュエータの駆動で鋼製部材の圧入を行うものであることを特徴とする、鋼製部材の溶接・圧入装置。
The upper structure above is constructed by mounting the following components on a movable frame body that can be moved by attaching a caster to the bottom of a rigid frame that has an approximately U shape with one side open when viewed in the plane direction. A device used in places where the body is subject to height restrictions,
In the substantially U-shaped rigid frame, guides are provided in the vertical direction on the inner side surfaces of the opposing arms, and a pair of upper and lower annular clamp mechanisms that grip the steel member can be moved up and down along the guides. Are located in
Each of the pair of upper and lower clamping mechanisms is composed of a combination of a semi-annular fixed portion and a movable portion, which is equal to a ring body that surrounds the outer periphery of the steel member, and the fixed portion is connected to the two guides facing each other. In the supported and guided configuration, the movable part located on the open side of the substantially U-shaped rigid frame is rotatably pinned at one end to one end of the fixed part, and the other end is fixed the same. It is attached to the other end of the part by a detachable pin so that it can be freely opened and closed, and a plurality of hydraulic jacks for clamping that grip or release the enclosed steel member are installed inward in this pair of upper and lower annular clamp mechanisms And
Between the upper and lower clamp mechanisms, a plurality of upset actuators for bringing the same pair of clamp mechanisms closer to or away from each other are connected in parallel with the guide, and the upset actuators are connected in the upper clamp mechanism. A reaction force receiving portion that exerts a reaction force on the upper structure at the upper position or in the vicinity thereof is provided upward, and further supports the pair of upper and lower clamp mechanisms as a whole, and moves up and down to move up and down. One end of which is attached to the guide of the rigid frame, the other end is connected to one clamp mechanism,
It is configured to have a welding electrode connected to a position close to the top and bottom of the joining position of the two steel members stacked and abutted up and down,
The steel member of unit length opens the movable part of the pair of upper and lower clamp mechanisms and accepts it in the lateral direction, closes the movable part, operates the above lifting means and upset actuator and the upper part of the reaction force receiving part is the upper structure The reaction force is applied to the body, the steel member is gripped by the lower clamp mechanism, and the steel member is press-fitted by driving the upset actuator. Open the movable part of the mechanism and accept it in the horizontal direction, stack the steel members on the preceding steel member and contact them, connect the welding electrodes near the joining position of each of the two upper and lower steel members, Actuate the upset actuator to join by flash welding with pressurization, then apply the reaction force to the upper structure at the reaction force receiving part, and clamp the steel member with the lower clamping mechanism Characterized in that performs a press-fitting of the steel member by driving the chipset actuator, welding and press-fitting apparatus of the steel member.
上記請求項1に記載した鋼製部材の溶接・圧入装置を使用して、上方の上部構造体により高さ制限を受ける場所で、単位長さの鋼製部材を順次積み重ね、その接合位置を溶接し前記単位長さづ鋼製部材を圧入する溶接・圧入工法であって、
上記溶接・圧入装置のクランプ機構の可動部を開いて鋼製部材を横方向に受け入れ、同鋼製部材を先行の鋼製部材の上に積み重ねて当接させ、上下二つの鋼製部材をそれぞれ上下に一対をなすクランプ機構で掴ませたクランプ状態とし、且つ二つの鋼製部材の前記接合位置の近傍に溶接用電極を接続し、この溶接用電極を通じて鋼製部材の接合位置へ大電流を断続的に流すことにより加熱し、前記アプセット用アクチュエータで鋼製部材の接合位置を加圧するフラッシュ溶接法で二つの鋼製部材を接合する段階と、
一対をなすクランプ機構をアンクランプ状態とし、上記昇降手段とアプセット用アクチュエータを作動させて、反力受け部が上方の上部構造体反力をとり、下位のクランプ機構鋼製部材を掴ませたクランプ状態として、前記アプセット用アクチュエータで下位のクランプ機構を下向きに駆動して鋼製部材の圧入を行い、更に下位のクランプ機構をアンクランプ状態とし昇降手段で一定ストローク引き上げ、再度下位のクランプ機構で鋼製部材を掴ませたクランプ状態とし、前記アプセット用アクチュエータの駆動により鋼製部材の圧入を行う工程を繰り返して鋼製部材の圧入を進める段階とから成ることを特徴とする、鋼製部材の溶接・圧入工法。
Using the steel member welding and press-fitting device according to claim 1 above, steel members of unit length are sequentially stacked at a place where the height is restricted by the upper structure above , and the joining positions are welded. a welding and press-fit method of press-fitting the unit length Dzu one steel member and,
Open the movable part of the clamp mechanism of the welding and press-fitting device to receive the steel member in the lateral direction, stack the steel member on the preceding steel member and bring them into contact with each other, and attach the two upper and lower steel members respectively vertically and clamped state in which the gripped by the clamp mechanism forming a pair, and to connect the welding electrodes in the vicinity of the joining position of the two steel members, a large current through the welding electrode to the bonding position of the steel member heated by passing intermittently, the steps of joining the two steel members with flash welding method that pressurize the joint position of the steel member by the upsetting actuator,
The clamping mechanism forming a pair up or down to an unclamped state, by operating the elevating means and upset actuator, the reaction force receiving portion takes a reaction force on the upper structure of the upper, the steel member at a lower clamping mechanism as a clamp state in which grabbed the drives clamping mechanism subordinate downwardly upset actuator performs press-fitting of the steel member, further the lower clamping mechanism and unclamped constant stroke pulling in lifting means, again It is a clamped state in which a steel member is gripped by a lower clamp mechanism, and the step of press-fitting the steel member by repeating the step of press-fitting the steel member by driving the upset actuator is characterized in that , Welding and press-fitting methods for steel members.
前記アプセット用アクチュエータによる鋼製部材の圧入は、上下方向に加振しながら圧入を進めることを特徴とする、請求項に記載した鋼製部材の溶接・圧入工法。The press-fitting of the steel member by upsetting actuator is vertically vibrating article is characterized in that the advancing et pressure input, welding and press-fitting method of a steel member according to claim 2.
JP2000229645A 2000-07-28 2000-07-28 Steel welding and press-fitting equipment and welding and press-fitting methods Expired - Fee Related JP4197833B2 (en)

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