JP2004337951A - Arc shielding body for joining reinforcing bar used for arc stud welding method and reinforcing bar welding method using the same - Google Patents

Arc shielding body for joining reinforcing bar used for arc stud welding method and reinforcing bar welding method using the same Download PDF

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JP2004337951A
JP2004337951A JP2003140338A JP2003140338A JP2004337951A JP 2004337951 A JP2004337951 A JP 2004337951A JP 2003140338 A JP2003140338 A JP 2003140338A JP 2003140338 A JP2003140338 A JP 2003140338A JP 2004337951 A JP2004337951 A JP 2004337951A
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arc
shield body
reinforcing bar
stud welding
heat
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Kazuki Nishinosono
一樹 西之園
Hideo Sato
秀雄 佐藤
Akira Umekuni
章 梅国
Masahiro Sugata
昌宏 菅田
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Takenaka Komuten Co Ltd
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Takenaka Komuten Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an arc shielding body used for arc stud welding of butted reinforcing bars to each other and an arc stud welding method for the reinforcing bars using the same. <P>SOLUTION: The arc shielding body is constituted to a cylindrical body which can be inserted with the ends of the reinforcing bars to be joined from both sides and can butt these ends. Annular or cylindrical heat resistant members which absorb the ruggedness of the reinforcing bar surfaces are fitted into the through-hole thereof apart spacing near their intermediate positions. The internal diameter of the heat resistant members is made approximately the same as the external diameter of the reinforcing bars. The spacing portions opened between the heat resistant members are formed as groove sections for forming the reinforcement of weld of a junction and a plurality of gas vent holes are disposed on the outer peripheral walls of the groove sections. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、突き合わせた鉄筋相互をアークスタッド溶接するために用いるアークシールド体、及びそれを用いた鉄筋のアークスタッド溶接方法の技術分野に属する。
【０００２】
【従来の技術】
アークスタッド溶接法に用いるアークシールド体は、棒鋼のスタッド材を板状の母材へ溶接するのに適した形状とされている。具体的には、前記アークシールド体はスタッド材の端部を挿入できる筒状体の耐熱性磁器で構成され、その貫通孔の内径は前記鉄筋の外径と略同径とされている。前記貫通孔の下端部には円周方向に接合部の余盛形成用の溝部が形成され、該溝部の外周にアークシールドガスを側方へ排出するガス抜き孔が設けられている。そして、前記アークシールド体の下端面は、母材の上面に設置してスタッド材との接合部を囲むことによって溶融金属の飛散を防ぎ、接合部の余盛を形成できるように、水平面状に形成されている。
【０００３】
上記構成のアークシールド体は、突き合わせた鉄筋相互をアークスタッド溶接する際にも転用されるが、鉄筋相互の接合部を囲めるように工夫を施す必要がある。
【０００４】
（Ｉ）前記アークシールド体を用いて鉄筋相互の接合部を囲む技術としては、例えば、以下のものが開示されている。
（ｉ）特許文献１には、一方の鉄筋の端部に金属又は非金属性の輪を嵌め込み、その上面にアークシールド体を設置することで、上述したスタッド材と母材との配置を再現し、前記アークシールド体で接合部を囲む技術が開示されている。
（ｉｉ）特許文献２には、一方の鉄筋の端部の外周に支持部材を嵌め込み、その上面にアークシールド体の受金属板を設置し、該受金属板の上面にアークシールド体を設置することで、上記（ｉ）の技術と同様に、スタッド材と母材との配置を再現し、前記アークシールド体で接合部を囲む技術が開示されている。
（ｉｉｉ）特許文献３には、鉄筋相互の端部に嵌め込まれたアークシールド体の端面同士を接着剤で接着することで、アークシールド体で接合部を囲む技術が開示されている。
【０００５】
（ＩＩ）アークシールド体を鉄筋の端部に簡単に固定する技術としては、例えば、以下のものが開示されている。
特許文献４には、鉄筋相互の端部にアークシールド体の固定用クリップを嵌め込み、そのクリップへアークシールド体を差し込んで固定する技術が開示されている。
【０００６】
（ＩＩＩ）鉄筋相互をアークスタッド溶接する方法の技術としては、例えば、以下のものが開示されている。
特許文献５及び特許文献６には、上記構成のアークシールド体を用いて鉄筋相互をアークスタッド溶接する方法が開示されている。
【０００７】
【特許文献１】
特公昭３４−１２５９号公報
【特許文献２】
特開昭５８−６７８０号公報
【特許文献３】
実公昭３６−２５５３６号公報
【特許文献４】
特開昭５８−７４２８４号公報
【特許文献５】
特開平１０−１７５０７５号公報
【特許文献６】
特開２００２−１２００６９号公報
【０００８】
【本発明が解決しようとする課題】
通例、上記構成のアークシールド体は、挿入されるスタッド材表面の凹凸を吸収できる構成とされていない。そのため、前記スタッド材が異形棒鋼から成るときは、アークシールド体の貫通孔の内周面や孔縁と棒鋼の節やリブが引っ掛からないように、予め棒鋼表面を滑らかに切削する必要がある。この点は、上記（Ｉ）及び（ＩＩ）の技術でも例外ではない。接合する鉄筋が異形棒鋼から成るときは、鉄筋表面を滑らかに切削する必要があり、そのための手間が掛かりコストが嵩む問題点がある。
【０００９】
上記（ＩＩＩ）の特許文献５及び特許文献６の溶接方法も同様に、上記構成のアークシールド体を用いているため、鉄筋が異形棒鋼から成るときは、やはり鉄筋表面を滑らかに切削する必要がある。
【００１０】
本発明の目的は、鉄筋表面を滑らかに切削することなく、そのまま用いて溶接することができるアークシールド体、及びそれを用いた鉄筋のアークスタッド溶接方法を提供することである。
【００１１】
【課題を解決するための手段】
上記従来技術の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アークスタッド溶接法に用いる鉄筋接合用アークシールド体は、
突き合わせた鉄筋相互をアークスタッド溶接するために用いるアークシールド体において、
アークシールド体は、接合する鉄筋の端部を両側から挿入して突き合わせ可能な筒状体に構成され、その貫通孔には中間位置近傍に間隔を開けて、鉄筋表面の凹凸を吸収するリング状又は円筒状の耐熱性部材が嵌め込まれており、該耐熱性部材の内径は鉄筋の外径と略同径とされていること、
前記耐熱性部材の相互間に開けた間隔部分は接合部の余盛形成用の溝部とされ、同溝部の外周壁に複数のガス抜き孔が設けられていることを特徴とする。
【００１２】
請求項２記載の発明は、請求項１に記載したアークスタッド溶接法に用いる鉄筋接合用アークシールド体において、
耐熱性部材相互の間隔、及び耐熱性部材の内側端面の形状は、接合部の余盛形状の厚さ及び形状によって定めることを特徴とする。
【００１３】
請求項３記載の発明は、請求項１又は２に記載したアークスタッド溶接法に用いる鉄筋接合用アークシールド体において、
耐熱性部材はセラミックウール、耐熱ゴム、金属製部材等で構成されていることを特徴とする。
【００１４】
請求項４記載の発明は、請求項１に記載したアークスタッド溶接法に用いる鉄筋接合用アークシールド体において、
貫通孔に嵌め込まれた耐熱性部材の内側端面の近傍位置に、アルミニウムを主成分とするフラックスが設置されていることを特徴とする。
【００１５】
請求項５記載の発明は、請求項１記載したアークスタッド溶接法に用いる鉄筋接合用アークシールド体において、
ガス抜き孔は、溝部の半周より狭い範囲に設けられていることを特徴とする。
【００１６】
請求項６に記載した発明に係る鉄筋のアークスタッド溶接方法は、
突き合わせた鉄筋相互をアークスタッド溶接する方法において、
鉄筋接合用アークシールド体は筒状体に形成し、その貫通孔には中間位置近傍に間隔を開けて、鉄筋表面の凹凸を吸収する、鉄筋の外径と略等しい内径のリング状又は円筒状の耐熱性部材を嵌め込み、前記耐熱性部材の相互間に開けた間隔部分を接合部の余盛形成用の溝部として、同溝部の外周壁に複数のガス抜き孔を設けた構成とすること、
接合する一方の鉄筋の端部にフラックスを取り付け、上記アークシールド体の貫通孔の両側から鉄筋の端部を挿入し相対峙させること、
前記鉄筋の軸心と平行に溶接装置の本体部を配置し、該溶接装置の電極兼チャックでアークシールド体の両側の鉄筋をそれぞれ支持させ、前記電極兼チャックを接近する方向へ移動させて、各鉄筋の先端部を突き合わせると共に通電して鉄筋相互をアークスタッド溶接することを特徴とする。
【００１７】
請求項７に記載した発明に係る鉄筋のアークスタッド溶接方法は、
突き合わせた鉄筋相互をアークスタッド溶接する方法において、
鉄筋接合用アークシールド体は筒状体に形成し、その貫通孔には中間位置近傍に間隔を開けて、鉄筋表面の凹凸を吸収する、鉄筋の外径と略等しい内径のリング状又は円筒状の耐熱性部材を嵌め込むと共に、一方の耐熱性部材の内側端面の近傍位置にアルミニウムを主成分とするフラックスを設置し、前記耐熱性部材の相互間に開けた間隔部分を接合部の余盛形成用の溝部として、同溝部の外周壁に複数のガス抜き孔を設けた構成とすること、
前記アークシールド体の貫通孔の両側から鉄筋の端部を挿入し相対峙させること、
前記鉄筋の軸心と平行に溶接装置の本体部を配置し、該溶接装置の電極兼チャックでアークシールド体の両側の鉄筋をそれぞれ支持させ、前記電極兼チャックを接近する方向へ移動させて、各鉄筋の先端部を突き合わせると共に通電して鉄筋相互をアークスタッド溶接することを特徴とする。
【００１８】
【本発明の実施形態、及び実施例】
先ず、請求項１〜請求項５に記載した発明に係るアークスタッド溶接法に用いる鉄筋接合用アークシールド体（以下、アークシールド体と云う。）の実施形態を、図１〜図７に基づいて説明する。なお、図１〜図５のアークシールド体１を用いる際には、予め鉄筋２又は３のいずれか一方の端部にフラックス４が取り付けられることを前提としている（図４を参照）。
【００１９】
このアークシールド体１は、通例のアークシールド体と同様に耐熱性磁器からなる。図４に示すように、接合する２本の鉄筋２と３の端部２ａと３ａが両側から挿入され突き合わせ可能な筒状体に構成され、その貫通孔５には、図２に示すように中間位置近傍に間隔Ｔを開けて、鉄筋２、３表面の節やリブなどの凹凸を吸収するリング状又は円筒状の耐熱性部材６が嵌め込まれている。前記耐熱性部材６の内径ｒは鉄筋２（３）の外径Ｒと略同径とされ、挿入された鉄筋表面の凹凸に馴染み、且つ鉄筋２（３）の押し込み、又は引き上げの支障とならないセラミックウールや耐熱ゴム、若しくは金属製部材等で構成され、貫通孔５の両側から嵌め込まれている（図３及び図４を参照、請求項３記載の発明）。前記耐熱性部材６、６の相互間に開けた間隔部分は、接合部の余盛形成用の溝部７とされ、その溝部７の外周壁の全域に複数のガス抜き孔８…が設けられている。前記アークシールド体１の貫通孔５の両側から挿入される鉄筋表面の凹凸は耐熱性部材６によって吸収される。よって、前記鉄筋２、３の端部表面を滑らかに切削する必要がなく、加工の手間を省略でき、コストの削減にも寄与する。また、前記アークシールド体１の貫通孔５へ挿入された鉄筋相互は、図４に示すように確実に同一軸心上に配置されるので、該鉄筋相互を簡単、確実に同一軸心上で接合することができる。
【００２０】
前記耐熱性部材６、６相互の間隔Ｔ、及び耐熱性部材６、６の内側端面６ａ、６ａの形状は、接合部の余盛形状の厚さ及び形状によって定められる（請求項２記載の発明）。そのため、発現させるべき接合部の強度等に応じて、簡単に接合部の余盛形状の厚さ及び形状を変えることができる。また、厚みの異なる耐熱性部材６を嵌め込むだけで、直径の異なる鉄筋に対応することができる。
【００２１】
なお、本実施形態のアークシールド体１はガス抜き孔８が溝部７の外周全域に設けられているが、この限りではない。鉄筋相互を水平配置で接合する際に用いるアークシールド体１のガス抜き孔８は、同ガス抜き孔８から溶融金属が垂れ落ちないように、溝部７の半周（上半分）より狭い範囲にのみ設けられる（図５を参照、請求項５記載の発明）。
【００２２】
また、図６及び図７に示すように、アークシールド体１の貫通孔５に嵌め込まれた耐熱性部材６の内側端面６ａの近傍位置に、アルミニウムを主成分とするフラックス９を設置すると更に良い（請求項４記載の発明）。具体的には、前記フラックス９は、貫通孔５内へ嵌め込まれた状態で拘束されるように、前記貫通孔５の内径と略等しい外径を有する板状体に成形されており、一方（図６では上方）の耐熱性部材６の内側端面６ａの近傍位置まで嵌め込まれ、溝部７で拘束されている。つまり、前記アークシールド体１の貫通孔５へ鉄筋２の端部２ａを挿入しフラックス９に当接させるだけで、簡単にフラックス９の設置（取付）作業は完了する。そのため、予め鉄筋端部にフラックスを取り付ける必要がなく、取り付け作業の手間を省略でき、やはりコストの削減にも寄与する。
【００２３】
次に、請求項６に記載した発明に係る鉄筋のアークスタッド溶接方法の実施形態を、図８及び図９に基づいて説明する。
【００２４】
この溶接方法では、図１〜図４に示したアークシールド体１を用いる。すなわち、前記アークシールド体１は筒状体に形成し、その貫通孔５には中間位置近傍に間隔を開けて、鉄筋表面の凹凸を吸収する、鉄筋の外径Ｒと略等しい内径ｒのリング状又は円筒状の耐熱性部材６、６を嵌め込み、前記耐熱性部材６、６の相互間に設けた間隔部分を接合部の余盛形成用の溝部７として、同溝部７の外周に複数のガス抜き孔８…を設けた構成としている。
【００２５】
本実施形態で用いる溶接装置１０は、油圧シリンダ等で構成され伸縮可能な本体部１１と、該油圧シリンダ（以下、本体部と同一符号１１を使用する。）のシリンダ部１１ａへ連結された電極兼チャック１２と、油圧シリンダ１１のロッド１１ｂの先端部へ連結された電極兼チャック１３とを有する。前記２個の電極兼チャック１２、１３は、図９に示すように同形、同大のＵ字形状に形成しており、その内部（凹部）が鉄筋嵌入部１２ａ、１３ａとし、該嵌入部１２ａ、１３ａを嵌めた鉄筋２、３を同一方向から固定する複数本（本実施形態では２本）のボルト１６、１６を有する。つまり、前記溶接装置１０は、アークシールド体１へ挿入された鉄筋２と３を同一軸線上に配置した状態で支持でき、しかもその状態を維持して鉄筋２、３を軸線方向に相対的に移動させることができる構成としている。
【００２６】
上記アークシールド体１と溶接装置１０を用いて、鉄筋２、３相互は以下の手順で接合する。
接合する一方の鉄筋２の端部２ａにフラックス４を取り付け、上記アークシールド体１の貫通孔５の両側から鉄筋２、３の端部２ａ、３ａを挿入する。次に、前記鉄筋２、３の軸心Ｎと平行に溶接装置１０の本体部１１を配置し、アークシールド体１の両側の鉄筋２、３へ、電極兼チャック１２、１３の嵌入部１２ａ、１３ａを嵌めボルト１６で固定する。そして、前記溶接装置１０の本体部１１を収縮させて鉄筋２と３の端面同士を突き合わせると共に、電極兼チャック１２（又は１３）から通電し、前記本体部１１を伸長させて鉄筋２と３の端面間にアークを発生させ、所定の時間経過後に、再び前記本体部１１を収縮させて鉄筋２と３の端部同士を押し込む。最後に、アークシールド体１と溶接装置１０を撤去すると接合作業は完了する。
【００２７】
上記アークスタッド溶接方法は、図１〜図４に示したアークシールド体１を用いるので、鉄筋２、３が異形棒鋼から成るときでも、鉄筋表面を滑らかに切削する必要がなく、加工の手間を省略でき、コストの削減にも寄与する。また、鉄筋相互を簡単、確実に同一軸心上で接合することができる。
【００２８】
更に、請求項７に記載した発明に係るアークスタッド溶接方法の実施形態を説明する。なお、前記溶接方法は図８及び図９に示した溶接方法と略同様であるので、当該図面を引用しながら説明する。
【００２９】
この溶接方法では、図６及び図７に示したアークシールド体１を用いる。すなわち、前記アークシールド体１は筒状体に形成し、その貫通孔５には中間位置近傍に間隔を開けて、鉄筋表面の凹凸を吸収する、鉄筋の外径Ｒと略等しい内径ｒのリング状又は円筒状の耐熱性部材６、６を嵌め込むと共に、一方の耐熱性部材６の内側端面６ａの近傍位置にアルミニウムを主成分とするフラックス９を設置し、前記耐熱性部材６、６の相互間に開けた間隔部分を接合部の余盛形成用の溝部７として、同溝部７の外周に複数のガス抜き孔８…を設けた構成としている。
【００３０】
本実施形態で用いる溶接装置は、図８及び図９に示した溶接装置１０を用いるが、構成は既に説明したので省略する。
【００３１】
上記アークシールド体１と溶接装置１０を用いて、鉄筋２、３相互は以下の手順で接合する。
上記アークシールド体１の貫通孔５の両側から、前記鉄筋２、３の端部２ａ、３ａを挿入する。その後は、図８及び図９に示した溶接方法と同様に、鉄筋２、３の軸心Ｎと平行に溶接装置１０の本体部１１を配置し、該溶接装置１０の電極兼チャック１２、１３でアークシールド体１の両側の鉄筋２、３をそれぞれ支持させ、前記電極兼チャック１２、１３を接近する方向へ移動させて、各鉄筋２、３相互の先端部を突き合わせると共に通電して鉄筋２、３相互をアークスタッド溶接する。
【００３２】
上記アークスタッド溶接方法は、図６及び図７に示したアークシールド体１を用いるので、予め鉄筋端部にフラックスを取り付ける必要がなく、取り付け作業を省略でき、コストの削減にも寄与する。また、鉄筋２、３が異形棒鋼から成るときでも、鉄筋表面を滑らかに切削する必要がなく、加工の手間を省略でき、やはりコストの削減にも寄与する。もちろん、鉄筋相互を簡単、確実に同一軸心上で接合することができる。
【００３３】
なお、上記実施形態に用いた溶接装置１０は、本体部１１を伸縮させることで電極兼チャック１２、１３を移動させる構成としているが、これに限らない。すなわち、電極兼チャック１２、１３の少なくとも一方が鉄筋の軸心方向に移動する構成の溶接装置であれば、同様に用いることができる。
【００３４】
【本発明の奏する効果】
請求項１〜請求項５に記載した発明に係るアークスタッド溶接法に用いる鉄筋接合用アークシールド体は、貫通孔内に鉄筋表面の凹凸を吸収する耐熱性部材が嵌め込まれているので、接合する鉄筋が異形棒鋼から成るときでも、該鉄筋の端部表面を滑らかに切削する必要がなく、加工の手間を省略でき、コストの削減にも寄与する。また、貫通孔の両側から鉄筋の端部をそれぞれ挿入する構成とされているので、当該接合する鉄筋相互を簡単、確実に同一軸心上に配置でき、該鉄筋相互を簡単に同一軸線上で接合することができる。
【００３５】
請求項６及び請求項７に記載した発明に係る鉄筋のアークスタッド溶接方法は、貫通孔内に鉄筋表面の凹凸を吸収する耐熱性部材を嵌め込んだアークシールド体を用いるので、接合する鉄筋が異形棒鋼から成るときでも、該鉄筋の端部表面を滑らかに切削する必要がなく、加工の手間を省略でき、やはりコストの削減に寄与する。
【図面の簡単な説明】
【図１】本発明に係るアークスタッド溶接法に用いる鉄筋接合用アークシールド体の実施形態を示した正面図である。
【図２】図１の縦断面図である。
【図３】図１の水平断面図である。
【図４】鉄筋の端部が挿入された鉄筋接合用アークシールド体を示した縦断面図である。
【図５】図１に示した鉄筋接合用アークシールド体の異なる実施形態を示した正面図である。
【図６】図１に示した鉄筋接合用アークシールド体の更に異なる実施形態を示した縦断面図である。
【図７】図６のＡ−Ａ断面図である。
【図８】請求項６に記載した発明に係る鉄筋のアークシールド溶接方法の実施形態を概略的に示した正面図である。
【図９】図８の縦断面図である。
【符号の説明】
１ 鉄筋接合用アークシールド体
２、３ 鉄筋
２ａ、３ａ 鉄筋の端部
４ フラックス
５ 貫通孔
６ 耐熱性部材
７ 溝部
８ ガス抜き孔
Ｒ 鉄筋の外径
ｒ 耐熱性部材の内径
９ フラックス
１０ 溶接装置
１１ 本体部
１２、１３ 電極兼チャック
Ｎ 鉄筋の軸心[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of an arc shield body used for arc stud welding of butted rebars, and a method for arc stud welding of rebar using the same.
[0002]
[Prior art]
The arc shield body used in the arc stud welding method has a shape suitable for welding a bar steel stud material to a plate-shaped base material. Specifically, the arc shield body is formed of a cylindrical heat-resistant porcelain into which an end of a stud material can be inserted, and the inner diameter of the through hole is substantially the same as the outer diameter of the rebar. At the lower end of the through-hole, a groove is formed in the circumferential direction for forming an extra portion of the joint, and a gas vent hole for discharging the arc shield gas to the side is provided on the outer periphery of the groove. And the lower end surface of the arc shield body is placed on the upper surface of the base material to prevent the molten metal from scattering by surrounding the joint with the stud material, so that a margin of the joint can be formed. Is formed.
[0003]
The arc shield body having the above configuration is also diverted when arc stud welding is performed between butted rebars, but it is necessary to devise a method so as to surround the joint between the rebars.
[0004]
(I) The following is disclosed as a technique for surrounding a joint between rebars using the arc shield body, for example.
(I) According to Patent Literature 1, a metal or non-metallic ring is fitted to one end of a reinforcing bar, and an arc shield body is installed on the upper surface thereof, thereby reproducing the above-described arrangement of the stud material and the base material. In addition, a technique for surrounding a joint with the arc shield body is disclosed.
(Ii) In Patent Literature 2, a support member is fitted around the end of one reinforcing bar, a metal receiving plate of an arc shield is installed on the upper surface, and the arc shield is installed on the upper surface of the metal receiving plate. Thus, similarly to the technique (i), a technique is disclosed in which the arrangement of the stud material and the base material is reproduced, and the joint is surrounded by the arc shield body.
(Iii) Patent Literature 3 discloses a technique in which end faces of arc shield bodies fitted to ends of rebars are adhered to each other with an adhesive, thereby surrounding a joint with an arc shield body.
[0005]
(II) As a technique for simply fixing the arc shield body to an end of a reinforcing bar, for example, the following is disclosed.
Patent Literature 4 discloses a technique in which a clip for fixing an arc shield body is fitted to ends of rebars, and the arc shield body is inserted into the clip and fixed.
[0006]
(III) As a technique of a method of arc stud welding rebars, for example, the following is disclosed.
Patent Literature 5 and Patent Literature 6 disclose a method of arc stud welding rebars using the arc shield body having the above-described configuration.
[0007]
[Patent Document 1]
JP-B-34-1259 [Patent Document 2]
JP-A-58-6780 [Patent Document 3]
Japanese Utility Model Publication No. 36-25536 [Patent Document 4]
JP-A-58-74284 [Patent Document 5]
JP-A-10-175075 [Patent Document 6]
JP, 2002-120069, A
[Problems to be solved by the present invention]
Usually, the arc shield body having the above configuration is not configured to be able to absorb irregularities on the surface of the stud material to be inserted. Therefore, when the stud material is made of deformed steel bar, it is necessary to smoothly cut the surface of the steel bar in advance so that the inner peripheral surface and hole edge of the through hole of the arc shield body and the nodes and ribs of the steel bar are not caught. This point is no exception in the techniques (I) and (II). When the reinforcing bar to be joined is made of a deformed bar, it is necessary to cut the surface of the reinforcing bar smoothly, which is troublesome and increases the cost.
[0009]
Similarly, in the welding methods of Patent Document 5 and Patent Document 6 of the above (III), since the arc shield body having the above configuration is used, when the reinforcing bar is made of deformed steel bar, the surface of the reinforcing bar also needs to be cut smoothly. is there.
[0010]
SUMMARY OF THE INVENTION An object of the present invention is to provide an arc shield body that can be used as it is without smoothly cutting the surface of a reinforcing bar, and an arc stud welding method for a reinforcing bar using the same.
[0011]
[Means for Solving the Problems]
As means for solving the above-mentioned problems of the prior art, an arc shield body for rebar joining used in an arc stud welding method according to the invention described in claim 1 is:
In an arc shield body used for arc stud welding of butted rebars,
The arc shield body is a cylindrical body that can be joined by inserting the ends of the reinforcing bar to be joined from both sides and has a through hole with a space near the middle position to absorb irregularities on the reinforcing bar surface. Or a cylindrical heat-resistant member is fitted, the inner diameter of the heat-resistant member is substantially the same diameter as the outer diameter of the rebar,
The space portion formed between the heat-resistant members is a groove for forming an extra bank of a joint portion, and a plurality of gas vent holes are provided on an outer peripheral wall of the groove.
[0012]
According to a second aspect of the present invention, there is provided an arc shield body for reinforcing steel joint used in the arc stud welding method according to the first aspect,
The distance between the heat-resistant members and the shape of the inner end face of the heat-resistant member are determined by the thickness and shape of the extra shape of the joint.
[0013]
According to a third aspect of the present invention, there is provided an arc shield body for rebar joining used in the arc stud welding method according to the first or second aspect,
The heat resistant member is made of ceramic wool, heat resistant rubber, metal member, or the like.
[0014]
According to a fourth aspect of the present invention, there is provided an arc shield body for rebar joining used in the arc stud welding method according to the first aspect,
A flux mainly composed of aluminum is provided at a position near the inner end face of the heat-resistant member fitted into the through hole.
[0015]
According to a fifth aspect of the present invention, there is provided an arc shield body for rebar joining used in the arc stud welding method according to the first aspect,
The gas vent hole is provided in a range narrower than a half circumference of the groove.
[0016]
An arc stud welding method for a reinforcing bar according to the invention described in claim 6,
In the method of arc stud welding butted rebars,
The arc shield body for rebar joining is formed in a cylindrical body, and its through hole is spaced near the middle position to absorb irregularities on the rebar surface, and has a ring shape or cylindrical shape with an inside diameter approximately equal to the outside diameter of the rebar. The heat-resistant member is fitted, and a gap formed between the heat-resistant members is provided as a groove for forming an extra portion of the joint, and a plurality of gas vent holes are provided on the outer peripheral wall of the groove.
Attach flux to the end of one of the reinforcing bars to be joined, insert the ends of the reinforcing bars from both sides of the through hole of the arc shield body, and face each other,
Arranging the main body of the welding device in parallel with the axis of the reinforcing bar, supporting the reinforcing bars on both sides of the arc shield body with the electrode / chuck of the welding device, and moving the electrode / chuck in the approaching direction, Arc stud welding is performed between the rebars by abutting the ends of the rebars and energizing the rebars.
[0017]
An arc stud welding method for a reinforcing bar according to the invention described in claim 7,
In the method of arc stud welding butted rebars,
The arc shield body for rebar joining is formed in a cylindrical body, and its through hole is spaced near the middle position to absorb irregularities on the rebar surface, and has a ring shape or cylindrical shape with an inside diameter approximately equal to the outside diameter of the rebar. And a flux mainly composed of aluminum is installed at a position near the inner end face of one of the heat resistant members, and an interval between the heat resistant members is filled with a margin of the joint. As a forming groove, a plurality of gas vent holes are provided on the outer peripheral wall of the groove,
Inserting the ends of the reinforcing bar from both sides of the through hole of the arc shield body and facing each other,
Arranging the main body of the welding device in parallel with the axis of the reinforcing bar, supporting the reinforcing bars on both sides of the arc shield body with the electrode / chuck of the welding device, and moving the electrode / chuck in the approaching direction, Arc stud welding is performed between the rebars by abutting the ends of the rebars and energizing the rebars.
[0018]
[Embodiments and Examples of the Present Invention]
First, an embodiment of an arc shield body for reinforcing steel joint (hereinafter, referred to as an arc shield body) used for an arc stud welding method according to the invention described in claims 1 to 5 will be described with reference to FIGS. 1 to 7. explain. When using the arc shield body 1 of FIGS. 1 to 5, it is assumed that the flux 4 is attached to one end of the reinforcing bar 2 or 3 in advance (see FIG. 4).
[0019]
This arc shield body 1 is made of heat-resistant porcelain similarly to a usual arc shield body. As shown in FIG. 4, the ends 2a and 3a of the two rebars 2 and 3 to be joined are formed into a tubular body that can be inserted and butt from both sides, and the through hole 5 has a through hole 5 as shown in FIG. A ring-shaped or cylindrical heat-resistant member 6 that absorbs irregularities such as nodes and ribs on the surfaces of the rebars 2 and 3 is fitted at intervals T near the intermediate position. The inner diameter r of the heat-resistant member 6 is substantially the same as the outer diameter R of the reinforcing bar 2 (3), so that it fits into the unevenness of the surface of the inserted reinforcing bar, and does not hinder the pushing or pulling of the reinforcing bar 2 (3). It is made of ceramic wool, heat-resistant rubber, a metal member, or the like, and is fitted from both sides of the through hole 5 (see FIGS. 3 and 4, the invention according to claim 3). The space between the heat-resistant members 6, 6 is formed as a groove 7 for forming an extra portion of the joint, and a plurality of gas vent holes 8 are provided in the entire outer peripheral wall of the groove 7. I have. Irregularities on the surface of the reinforcing bar inserted from both sides of the through hole 5 of the arc shield body 1 are absorbed by the heat resistant member 6. Therefore, it is not necessary to cut the end surfaces of the rebars 2 and 3 smoothly, so that the labor for processing can be omitted and the cost can be reduced. Further, as shown in FIG. 4, the rebars inserted into the through holes 5 of the arc shield body 1 are surely arranged on the same axis, so that the rebars can be easily and reliably coaxially arranged on the same axis. Can be joined.
[0020]
The distance T between the heat-resistant members 6, 6 and the shape of the inner end surfaces 6a, 6a of the heat-resistant members 6, 6, are determined by the thickness and shape of the excess shape of the joint (the invention according to claim 2). ). Therefore, it is possible to easily change the thickness and the shape of the extra shape of the joint according to the strength and the like of the joint to be developed. Further, it is possible to cope with rebars having different diameters only by fitting heat-resistant members 6 having different thicknesses.
[0021]
In addition, in the arc shield body 1 of the present embodiment, the gas vent holes 8 are provided in the entire outer periphery of the groove 7, but the gas vent hole 8 is not limited to this. The gas vent hole 8 of the arc shield body 1 used when joining the rebars in a horizontal arrangement is provided only in a range narrower than a half circumference (upper half) of the groove 7 so that molten metal does not drop from the gas vent hole 8. (See FIG. 5, the invention according to claim 5).
[0022]
Further, as shown in FIGS. 6 and 7, it is more preferable to install a flux 9 containing aluminum as a main component at a position near the inner end face 6 a of the heat resistant member 6 fitted into the through hole 5 of the arc shield body 1. (The invention according to claim 4). Specifically, the flux 9 is formed into a plate-like body having an outer diameter substantially equal to the inner diameter of the through hole 5 so as to be restrained while being fitted into the through hole 5. It is fitted to a position near the inner end face 6a of the heat-resistant member 6 (upper in FIG. 6) and is restrained by the groove 7. That is, the installation (attachment) of the flux 9 is completed simply by inserting the end 2 a of the reinforcing bar 2 into the through hole 5 of the arc shield body 1 and making the end 2 a contact the flux 9. For this reason, it is not necessary to attach the flux to the end of the reinforcing bar in advance, so that it is possible to omit the work of attaching the flux, which also contributes to cost reduction.
[0023]
Next, an embodiment of an arc stud welding method for a reinforcing bar according to the invention described in claim 6 will be described based on FIGS. 8 and 9.
[0024]
In this welding method, the arc shield body 1 shown in FIGS. 1 to 4 is used. That is, the arc shield body 1 is formed in a cylindrical body, and a ring having an inner diameter r substantially equal to the outer diameter R of the reinforcing bar is provided in the through hole 5 at an interval near the intermediate position to absorb irregularities on the reinforcing bar surface. Or cylindrical heat-resistant members 6, 6 are fitted into each other, and an interval provided between the heat-resistant members 6, 6 is used as a groove 7 for forming an extra portion of a joint portion. Gas vent holes 8 are provided.
[0025]
The welding apparatus 10 used in the present embodiment includes a telescopic main body 11 composed of a hydraulic cylinder or the like, and an electrode connected to a cylinder part 11a of the hydraulic cylinder (hereinafter, the same reference numeral 11 is used as the main body). It has a combined chuck 12 and an electrode and chuck 13 connected to the tip of the rod 11 b of the hydraulic cylinder 11. As shown in FIG. 9, the two electrodes and chucks 12 and 13 are formed in the same shape and the same U-shape, and the insides (recesses) thereof are rebar fitting portions 12a and 13a. , 13a are fitted with a plurality of (two in this embodiment) bolts 16, 16 for fixing the reinforcing bars 2, 3 from the same direction. That is, the welding device 10 can support the reinforcing bars 2 and 3 inserted into the arc shield body 1 in a state where they are arranged on the same axis, and maintain the state to relatively move the reinforcing bars 2 and 3 in the axial direction. It can be moved.
[0026]
Using the arc shield body 1 and the welding device 10, the reinforcing bars 2, 3 are joined to each other in the following procedure.
The flux 4 is attached to the end 2 a of one reinforcing bar 2 to be joined, and the ends 2 a and 3 a of the reinforcing bars 2 and 3 are inserted from both sides of the through hole 5 of the arc shield body 1. Next, the main body 11 of the welding device 10 is arranged in parallel with the axis N of the reinforcing bars 2 and 3, and the fitting portions 12 a of the electrode / chuck 12 and 13 are inserted into the reinforcing bars 2 and 3 on both sides of the arc shield body 1. 13 a is fixed with a fitting bolt 16. Then, the main body 11 of the welding device 10 is contracted so that the end faces of the reinforcing bars 2 and 3 are abutted with each other, and electricity is supplied from the electrode / chuck 12 (or 13) to extend the main body 11 and rebar 2 and 3 An arc is generated between the end surfaces of the reinforcing bars 2, and after a predetermined time has elapsed, the main body 11 is contracted again to push the ends of the reinforcing bars 2 and 3 together. Finally, when the arc shield body 1 and the welding device 10 are removed, the joining operation is completed.
[0027]
Since the arc stud welding method uses the arc shield body 1 shown in FIGS. 1 to 4, even when the reinforcing bars 2 and 3 are formed of deformed bars, it is not necessary to cut the surface of the reinforcing bars smoothly, and the processing time is reduced. It can be omitted and contributes to cost reduction. Further, the rebars can be easily and reliably joined on the same axis.
[0028]
Further, an embodiment of the arc stud welding method according to the invention described in claim 7 will be described. Since the welding method is substantially the same as the welding method shown in FIGS. 8 and 9, the description will be made with reference to the drawings.
[0029]
In this welding method, the arc shield body 1 shown in FIGS. 6 and 7 is used. That is, the arc shield body 1 is formed in a cylindrical body, and a ring having an inner diameter r substantially equal to the outer diameter R of the reinforcing bar is provided in the through hole 5 at an interval near the intermediate position to absorb irregularities on the reinforcing bar surface. Or a cylindrical heat-resistant member 6, and a flux 9 mainly composed of aluminum is installed at a position near the inner end face 6 a of one of the heat-resistant members 6. The space formed between the grooves is used as a groove 7 for forming an extra portion of the joint, and a plurality of gas vent holes 8 are provided on the outer periphery of the groove 7.
[0030]
As the welding device used in the present embodiment, the welding device 10 shown in FIGS. 8 and 9 is used.
[0031]
Using the arc shield body 1 and the welding device 10, the reinforcing bars 2, 3 are joined to each other in the following procedure.
The ends 2a, 3a of the reinforcing bars 2, 3 are inserted from both sides of the through hole 5 of the arc shield body 1. Thereafter, similarly to the welding method shown in FIGS. 8 and 9, the main body 11 of the welding device 10 is arranged parallel to the axis N of the reinforcing bars 2, 3, and the electrodes and chucks 12, 13 of the welding device 10 are provided. To support the rebars 2 and 3 on both sides of the arc shield body 1 respectively, move the electrode and chucks 12 and 13 in the approaching direction, abut the ends of the rebars 2 and 3, and energize the rebar. Two or three arc stud welding is performed.
[0032]
In the arc stud welding method, since the arc shield body 1 shown in FIGS. 6 and 7 is used, there is no need to attach a flux to the end of the reinforcing bar in advance, and the attaching operation can be omitted, which also contributes to cost reduction. Further, even when the reinforcing bars 2 and 3 are made of deformed steel bars, it is not necessary to cut the surface of the reinforcing bars smoothly, so that the labor for processing can be omitted, which also contributes to cost reduction. Of course, the rebars can be easily and reliably joined on the same axis.
[0033]
The welding device 10 used in the above embodiment is configured to move the electrode and chucks 12 and 13 by expanding and contracting the main body 11, but is not limited thereto. That is, a welding apparatus having a configuration in which at least one of the electrode and chucks 12 and 13 moves in the axial direction of the reinforcing bar can be used in the same manner.
[0034]
[Effects of the present invention]
In the arc shield body for rebar joining used in the arc stud welding method according to the first to fifth aspects of the present invention, since a heat-resistant member for absorbing irregularities on the surface of the rebar is fitted in the through hole, the joining is performed. Even when the reinforcing bar is made of deformed steel bar, it is not necessary to cut the end surface of the reinforcing bar smoothly, so that it is possible to save labor for processing and contribute to cost reduction. In addition, since the ends of the reinforcing bars are inserted from both sides of the through hole, the reinforcing bars to be joined can be easily and reliably arranged on the same axis, and the reinforcing bars can be easily aligned on the same axis. Can be joined.
[0035]
In the arc stud welding method of the reinforcing bar according to the invention described in claim 6 and claim 7, since the arc shield body in which the heat-resistant member that absorbs the unevenness of the reinforcing bar surface is inserted in the through hole, the reinforcing bar to be bonded is used. Even when the bar is made of a deformed steel bar, it is not necessary to cut the end surface of the reinforcing bar smoothly, so that the labor for processing can be omitted, which also contributes to cost reduction.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of an arc shield body for reinforcing bars used in an arc stud welding method according to the present invention.
FIG. 2 is a longitudinal sectional view of FIG.
FIG. 3 is a horizontal sectional view of FIG. 1;
FIG. 4 is a vertical cross-sectional view showing a reinforcing-bar joining arc shield body into which ends of reinforcing bars are inserted.
FIG. 5 is a front view showing a different embodiment of the arc shield body for reinforcing steel joint shown in FIG. 1;
FIG. 6 is a longitudinal sectional view showing still another embodiment of the arc shield body for reinforcing steel joint shown in FIG. 1;
FIG. 7 is a sectional view taken along line AA of FIG. 6;
FIG. 8 is a front view schematically showing an embodiment of an arc shield welding method for reinforcing steel according to the invention described in claim 6;
FIG. 9 is a longitudinal sectional view of FIG.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 arc shield body 2 for reinforcing bar joining, 3 reinforcing bar 2 a, 3 a end of reinforcing bar 4 flux 5 through hole 6 heat resistant member 7 groove portion 8 gas vent hole R outer diameter r of reinforcing bar inner diameter 9 of heat resistant member flux 10 welding device 11 Main part 12, 13 Electrode and chuck N Shaft center of rebar

Claims (7)

突き合わせた鉄筋相互をアークスタッド溶接するために用いるアークシールド体において、
アークシールド体は、接合する鉄筋の端部を両側から挿入して突き合わせ可能な筒状体に構成され、その貫通孔には中間位置近傍に間隔を開けて、鉄筋表面の凹凸を吸収するリング状又は円筒状の耐熱性部材が嵌め込まれており、該耐熱性部材の内径は鉄筋の外径と略同径とされていること、
前記耐熱性部材の相互間に開けた間隔部分は接合部の余盛形成用の溝部とされ、同溝部の外周壁に複数のガス抜き孔が設けられていることを特徴とする、アークスタッド溶接法に用いる鉄筋接合用アークシールド体。In an arc shield body used for arc stud welding of butted rebars,
The arc shield body is a cylindrical body that can be joined by inserting the ends of the reinforcing bar to be joined from both sides and has a through hole with a space near the middle position to absorb irregularities on the reinforcing bar surface. Or a cylindrical heat-resistant member is fitted, the inner diameter of the heat-resistant member is substantially the same diameter as the outer diameter of the rebar,
Arc stud welding, characterized in that the heat-resistant member is provided with a space portion formed between the heat-resistant members as a groove portion for forming an extra bank of a joint portion, and a plurality of gas vent holes are provided on an outer peripheral wall of the groove portion. Arc shield body for joining steel bars used in the method. 耐熱性部材相互の間隔、及び耐熱性部材の内側端面の形状は、接合部の余盛形状の厚さ及び形状によって定めることを特徴とする、請求項１に記載したアークスタッド溶接法に用いる鉄筋接合用アークシールド体。The reinforcing bar used in the arc stud welding method according to claim 1, wherein the distance between the heat-resistant members and the shape of the inner end surface of the heat-resistant member are determined by the thickness and shape of the extra shape of the joint. Arc shield body for joining. 耐熱性部材はセラミックウール、耐熱ゴム、金属製部材等で構成されていることを特徴とする、請求項１又は２に記載したアークスタッド溶接法に用いる鉄筋接合用アークシールド体。The arc shield body for rebar joining used in the arc stud welding method according to claim 1 or 2, wherein the heat resistant member is made of ceramic wool, heat resistant rubber, a metal member, or the like. 貫通孔に嵌め込まれた耐熱性部材の内側端面の近傍位置に、アルミニウムを主成分とするフラックスが設置されていることを特徴とする、請求項１に記載したアークスタッド溶接法に用いる鉄筋接合用アークシールド体。2. A reinforcing steel joint for use in an arc stud welding method according to claim 1, wherein a flux containing aluminum as a main component is installed at a position near the inner end face of the heat resistant member fitted into the through hole. Arc shield body. ガス抜き孔は、溝部の半周より狭い範囲に設けられていることを特徴とする、請求項１に記載したアークスタッド溶接法に用いる鉄筋接合用アークシールド体。The arc shield body for reinforcing bar joints used in the arc stud welding method according to claim 1, wherein the gas vent hole is provided in a range narrower than a half circumference of the groove. 突き合わせた鉄筋相互をアークスタッド溶接する方法において、
鉄筋接合用アークシールド体は筒状体に形成し、その貫通孔には中間位置近傍に間隔を開けて、鉄筋表面の凹凸を吸収する、鉄筋の外径と略等しい内径のリング状又は円筒状の耐熱性部材を嵌め込み、前記耐熱性部材の相互間に開けた間隔部分を接合部の余盛形成用の溝部として、同溝部の外周壁に複数のガス抜き孔を設けた構成とすること、
接合する一方の鉄筋の端部にフラックスを取り付け、上記アークシールド体の貫通孔の両側から鉄筋の端部を挿入し相対峙させること、
前記鉄筋の軸心と平行に溶接装置の本体部を配置し、該溶接装置の電極兼チャックでアークシールド体の両側の鉄筋をそれぞれ支持させ、前記電極兼チャックを接近する方向へ移動させて、各鉄筋の先端部を突き合わせると共に通電して鉄筋相互をアークスタッド溶接することを特徴とする、鉄筋のアークスタッド溶接方法。In the method of arc stud welding butted rebars,
The arc shield body for rebar joining is formed in a cylindrical body, and its through hole is spaced near the middle position to absorb irregularities on the rebar surface, and has a ring shape or cylindrical shape with an inside diameter approximately equal to the outside diameter of the rebar. The heat-resistant member is fitted, and a gap formed between the heat-resistant members is provided as a groove for forming an extra portion of the joint, and a plurality of gas vent holes are provided on the outer peripheral wall of the groove.
Attach flux to the end of one of the reinforcing bars to be joined, insert the ends of the reinforcing bars from both sides of the through hole of the arc shield body, and face each other,
Arranging the main body of the welding device in parallel with the axis of the reinforcing bar, supporting the reinforcing bars on both sides of the arc shield body with the electrode / chuck of the welding device, and moving the electrode / chuck in the approaching direction, An arc stud welding method for reinforcing bars, characterized in that the ends of the reinforcing bars are abutted and energized to perform arc stud welding between the reinforcing bars. 突き合わせた鉄筋相互をアークスタッド溶接する方法において、
鉄筋接合用アークシールド体は筒状体に形成し、その貫通孔には中間位置近傍に間隔を開けて、鉄筋表面の凹凸を吸収する、鉄筋の外径と略等しい内径のリング状又は円筒状の耐熱性部材を嵌め込むと共に、一方の耐熱性部材の内側端面の近傍位置にアルミニウムを主成分とするフラックスを設置し、前記耐熱性部材の相互間に開けた間隔部分を接合部の余盛形成用の溝部として、同溝部の外周壁に複数のガス抜き孔を設けた構成とすること、
前記アークシールド体の貫通孔の両側から鉄筋の端部を挿入し相対峙させること、
前記鉄筋の軸心と平行に溶接装置の本体部を配置し、該溶接装置の電極兼チャックでアークシールド体の両側の鉄筋をそれぞれ支持させ、前記電極兼チャックを接近する方向へ移動させて、各鉄筋の先端部を突き合わせると共に通電して鉄筋相互をアークスタッド溶接することを特徴とする、鉄筋のアークスタッド溶接方法。In the method of arc stud welding butted rebars,
The arc shield body for rebar joining is formed in a cylindrical body, and its through hole is spaced near the middle position to absorb irregularities on the rebar surface, and has a ring shape or cylindrical shape with an inside diameter approximately equal to the outside diameter of the rebar. And a flux mainly composed of aluminum is installed at a position near the inner end face of one of the heat resistant members, and an interval between the heat resistant members is filled with a margin of the joint. As a forming groove, a plurality of gas vent holes are provided on the outer peripheral wall of the groove,
Inserting the ends of the reinforcing bar from both sides of the through hole of the arc shield body and facing each other,
Arranging the main body of the welding device in parallel with the axis of the reinforcing bar, supporting the reinforcing bars on both sides of the arc shield body with the electrode / chuck of the welding device, and moving the electrode / chuck in the approaching direction, An arc stud welding method for reinforcing bars, characterized in that the ends of the reinforcing bars are abutted and energized to perform arc stud welding between the reinforcing bars.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019198891A1 (en) * 2018-04-09 2019-10-17 황영태 Fusion bonding type rebar coupler

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JPS4330034Y1 (en) * 1964-11-21 1968-12-09
JPS5127618B1 (en) * 1965-07-24 1976-08-13
JPS5874284A (en) * 1981-10-29 1983-05-04 Nippon Sutatsudouerudeingu Kk Butt welding of rod-like member
JPS5954166U (en) * 1982-09-30 1984-04-09 アイシン精機株式会社 arc butt welding machine
JPS61200666U (en) * 1985-06-01 1986-12-16
JPH0924472A (en) * 1995-07-12 1997-01-28 Kajima Corp Stud welding method
JPH09108859A (en) * 1995-10-06 1997-04-28 Junsei Sha Reinforcing bar welding method and reinforcing bar pinching device that is used for it
JPH09201676A (en) * 1996-01-24 1997-08-05 Kajima Corp Stud welding method

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Publication number Priority date Publication date Assignee Title
JPS4330034Y1 (en) * 1964-11-21 1968-12-09
JPS5127618B1 (en) * 1965-07-24 1976-08-13
JPS5874284A (en) * 1981-10-29 1983-05-04 Nippon Sutatsudouerudeingu Kk Butt welding of rod-like member
JPS5954166U (en) * 1982-09-30 1984-04-09 アイシン精機株式会社 arc butt welding machine
JPS61200666U (en) * 1985-06-01 1986-12-16
JPH0924472A (en) * 1995-07-12 1997-01-28 Kajima Corp Stud welding method
JPH09108859A (en) * 1995-10-06 1997-04-28 Junsei Sha Reinforcing bar welding method and reinforcing bar pinching device that is used for it
JPH09201676A (en) * 1996-01-24 1997-08-05 Kajima Corp Stud welding method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019198891A1 (en) * 2018-04-09 2019-10-17 황영태 Fusion bonding type rebar coupler

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