JP3566188B2

JP3566188B2 - Sealing material for electron beam welding

Info

Publication number: JP3566188B2
Application number: JP2000214907A
Authority: JP
Inventors: 秋雄西田
Original assignee: Kawasaki Jukogyo KK
Current assignee: Kawasaki Motors Ltd
Priority date: 2000-07-14
Filing date: 2000-07-14
Publication date: 2004-09-15
Anticipated expiration: 2020-07-14
Also published as: JP2002035957A

Description

【０００１】
【発明の属する技術分野】
本発明は、端面が相互に突き合わされた２本の管の外周面とシール押さえリングとの間に介在され、管外周面上に気密な外部空間を形成するために用いられる電子ビーム溶接用シール材に関する。
【０００２】
【従来の技術】
図１６は、２本の管１，２を溶接する電子ビーム溶接の従来技術のシール材１４，１５を備える管外周側シール装置６を示す断面図であり、図１７は管外周側シール装置６の分解斜視図である。高圧のガスなどの流体が流れるパイプラインの敷設工事では、予め敷設された既設管１の一端面に、新設管２の他端面を突き合わせ、この既設管１と新設管２との突き合わせ部４に、突き合わせ部４の内側に配置された電子銃３から電子ビーム５を照射することによって、既設管１と新設管２とを突き合わせ溶接する。この作業を順次繰り返して、新設管２を継ぎ足していくことによって、パイプラインが敷設される。この既設管１および新設管２は、たとえば管径が６００ｍｍφ以上の鋼管が使用され、継ぎ足される新設管２の長さはたとえば１２ｍ程度である。
【０００３】
上記の既設管１と新設管２とを、電子ビーム溶接によって良好に溶接するためには、突き合わせ部４の管軸方向両側の各管１，２の内側を管内周側シール装置（図示せず）によってシールして、気密な内部空間２２を形成し、外側を管外周側シール装置６によってシールして、気密な外部空間２１を形成し、この内部空間２２と外部空間２１とを減圧して真空状態にする必要がある。
【０００４】
管外周側シール装置６は、既設管１および新設管２の各突き合わせ端部７，８を外囲する一対のクランプリング９，１０と、この各クランプリング９，１０を既設管１および新設管２に取り外し可能に固定するクランプ手段１１と、各クランプリング９，１０を相互に近接する方向（図１６の左右方向）に引き寄せる引き付けシリンダ１３と、一対の環状のシール材１４，１５と、この一対のシール材１４，１５を押え込む一つのシール押さえリング１６と、電子ビーム５を遮蔽する遮蔽部材１８とを含んで構成される。
【０００５】
シール押さえリング１６は、半径方向内方（図１６の下方）に臨んで開口する環状の部材である。シール押さえリング１６の管軸方向（図１６の左右方向）両側壁の内周面１９，２０と、既設管１および新設管２の外周面との間に、シール材１４，１５が介在される。このシール材１４，１５は、無端環状または部材軸方向の１カ所で切断され、連結手段がない部材であり、ゴムなどの弾発性および可撓性を有する材料からなる。上記のように各部材が装着されることによって、シール押さえリング１６と、各管１，２の外周面とによって囲まれた外部空間２１が、大気に対して気密に遮断される。この外部空間２１の空気を真空ポンプ（図示せず）によって排気することによって、外部空間２１が真空状態となる。
【０００６】
【発明が解決しようとする課題】
既設管１と新設管２とを突き合わせ溶接した後、管外周側シール装置６が突き合わせ部４から取り外す必要がある。前述したように、各シール材１４，１５は環状であるため、各シール材１４，１５は、作業者が手作業で各シール材１４，１５を新設管２の突き合わせ端部８とは反対側の開口端部２７まで移動させ、この開口端部２７から引き抜くことによって、取り外される。しかしながら、新設管２は１２ｍもの長さを有するために、このように手作業でシール材１４，１５を引き抜く作業は、大きな労力を必要とし、作業者にとって負担が大きいという問題がある。また各シール材１４，１５は、自己の弾性力によって、既設管１および新設管２の外周面に密着しているので、これによっても引き抜き作業が困難であり、作業者にとって負担が大きいという問題がある。また部材軸方向の１カ所で切断され連結手段がないシール材においては、シール材本体の部材軸方向一端部の端面および他端部の端面を対向させた状態にしても、その両端面を密着させた状態を保持することが持続せず、真空排気中に大気に対する気密な遮断が損なわれ、必要な真空状態に到達することができない。したがってシール材の装着状況の再調整を行うという非能率的な問題がある。
【０００７】
したがって本発明の目的は、管から容易に取り外すことができ、大気に対する気密な遮断が可能な電子ビーム溶接用のシール材を提供することである。
【０００８】
【課題を解決するための手段】
請求項１記載の本発明は、端面が相互に突き合わされた２本の管の外周面と、各管を外囲するシール押さえリングの内周面との間に介在して、突き合わせ部の外周側に気密な外部空間を形成し、この外部空間および内部空間を減圧した状態で、突き合わせ部に内側から電子ビームを照射して、２本の管を突き合わせ溶接する電子ビーム溶接で用いられる電子ビーム溶接用シール材において、
各管の外周面上に全周にわたって巻き掛けられる長さを有し、可撓性および弾発性を有するシール材本体と、
このシール材本体の部材軸方向両端部に設けられ、両端部を相互に着脱可能に連結する連結手段とを含み、
前記シール材本体の部材軸方向一端部の端面および他端部の端面は、部材軸方向両端部を前記部材軸が共通な一直線を成すようにして対向させた状態で、前記共通な一直線を成す部材軸に対して垂直な第１の仮想一平面に交差する第２の仮想一平面に平行であることを特徴とする電子ビーム溶接用シール材である。
【０００９】
本発明に従えば、シール材は、可撓性および弾発性を有するシール材本体と、シール材本体の部材軸方向両端部に設けられる連結手段とを含んで構成される。突き合わせ部の両側の各管の外周面上に、シール材本体を全周にわたって巻き掛けた状態で、連結手段がシール材本体の部材軸方向両端部を連結することによって、突き合わせ部の外周面上に、環状のシール材が取り付けられる。この環状のシール材をシール押さえリングによって外囲することによって、シール押さえリングと突き合わせ部の外周面との間に気密な外部空間が形成される。この外部空間と突き合わせ部の内側の内部空間とを減圧した状態で、突き合わせ部に内側から電子ビームを照射することによって、２本の管が突き合わせ溶接される。
【００１０】
上述したように、連結手段はシール材本体の部材軸方向両端部に着脱可能に設けられているので、２本の管を突き合わせ溶接した後に、連結手段によるシール材本体の部材軸方向両端部の連結状態を解除することによって、シール材本体の部材軸方向両端部は管外周面上の装着位置で分離されるので、その装着位置で管の外周面上から、容易に取り外すことができる。したがって、従来技術のようにシール材を管の突き合わせ端部とは反対側の開口端部側に、手作業で移動させて引き抜く作業を必要としないので、作業者の負担が軽減する。また、シール材を各管に装着する前に各管を突き合わせたとしても、各管の外周面上に、シール材を容易に装着することができる。そしてシール材本体の部材軸方向一端部の端面および他端部の端面は、部材軸方向両端部を部材軸が共通な一直線を成すようにして対向させた状態で、前記共通な一直線を成す部材軸に対して、部材軸に垂直な第１の仮想一平面に交差する第２の仮想一平面に平行となるように形成される。つまり、シール材本体の各端面は、連結時に相互に平行であり、かつ部材軸に対して斜めになるように形成される。このように、部材軸に対して斜めに形成された各端面の面積は、部材軸に対して垂直に形成したときの各端面の面積よりも大きいので、シール材本体の両端部を連結したとき、相互に接触する各端面の接触面積が大きく、各端面の密着性が良好となり、従来技術のシール材に比べてシール性が損なわれることがない。また、各端面を斜めに形成することによって、シール材本体の部材軸方向両端部同士を容易に連結させることができ、また容易に連結解除することができる。
【００１１】
請求項２記載の本発明は、請求項１記載の構成において、前記連結手段は、前記シール材本体の部材軸方向一端部の端面から突出する突出部を有する係合部材と、
前記突出部に係合し、かつシール材本体の部材軸方向他端部の端面から露出する係止部を有し、シール材本体の部材軸方向他端部に埋設される係止部材とを含むことを特徴とする。
【００１２】
本発明に従えば、連結手段は、シール材本体の部材軸方向一端部の端面から、部材軸方向一方側に突出する突出部を有する係合部材と、シール材本体の部材軸方向他端部に埋設される係止部材とによって構成される。係合部材の突出部が係止部材の係止部に係合することによって、シール材本体の部材軸方向一端部と他端部とが連結され、シール材本体が環状となる。このとき、係止部材がシール材本体の他端部に埋設され、係合部材を係止する係止部がシール材本体の部材軸方向他端部の端面から露出しているので、シール材本体の一端部と他端部とが連結されたとき、シール材本体の部材軸方向一端部に設けられる係合部材の突出部は、シール材本体の部材軸方向他端部に完全に挿入された状態で係止部に係止される。したがって連結状態において、シール材本体の一端面と他端面とは、弾発的に当接し、シール材本体の両端部を隙間なく密着させ、２本の管の突き合わせ部を含む両側の管の外周面上に気密に遮断された外部空間を、確実に形成することができる。
【００１５】
【発明の実施の形態】
図１は、電子ビーム溶接で既設管５１と新設管５２とを突き合わせ溶接することによって、パイプラインを敷設する方法を示す図であり、図２は図１の切断面線ＩＩ−ＩＩから見た断面図であり、図３は図２の切断面線ＩＩＩ−ＩＩＩから見た断面図であり、図４は各管５１，５２の外周面上を外囲する外周側シール装置５４の分解斜視図である。
【００１６】
高圧のガスまたは液体などの流体が流れるパイプラインは、予め敷設された既設管５１の一端面（図３の左方）に、新設管５２の他端面（図３の右方）を突き合わせ、この各管５１，５２の突き合わせ部５３のＩ開先５７に、内周面全周にわたって、管内部に配置された電子銃５６から、たとえば０．５〜１．０ｍｍφの電子ビーム５８を照射することによって、各管５１，５２とを突き合わせ溶接して敷設される。この作業を順次繰り返して、新設管５２を継ぎ足していくことによって、パイプラインが敷設される。パイプラインを構成する各管５１，５２は、たとえば管径が５００〜１０００ｍｍφ、管の厚さが１５〜８０ｍｍ、かつ管の長さが５〜１２ｍ程度の丸鋼管が使用される。
【００１７】
上記のように、電子ビーム溶接によって既設管５１と新設管５２とを突き合わせ溶接するとき、各管５１，５２の内側を管内周側シール装置（図示せず）によってシールして、大気に対して気密な内部空間５９を形成し、各管５１，５２のの外側を管外周側シール装置５４によってシールして、大気に対して気密な外部空間６０を形成し、この内部空間５９および外部空間６０の空気を真空ポンプ（図示せず）によって排気して、内部空間５９および外部空間６０を、たとえば５×１０^−２ｔｏｒｒ程度にまで減圧して、真空状態にする必要がある。
【００１８】
管外周側シール装置５４は、既設管５１および新設管５２の各突き合わせ端部６９，７０を外囲し、各突き合わせ端部６９，７０の断面形状を真円形状に矯正する一対のクランプリング６１，６２と、この各クランプリング６１，６２を各管５１，５２に取り外し可能に固定する複数のクランプ手段６３と、各クランプリング６１，６２を相互に近接する方向に引き寄せる複数の引き付けシリンダ６５と、一対の本発明のシール材６６，６７と、この一対のシール材６６，６７を押さえ込む一つのシール押さえリング６４と、電子ビーム５８を遮蔽する遮蔽部材６８とによって構成される。
【００１９】
各クランプリング６１，６２は、周方向に等間隔に複数（本実施形態では３つ）に分断可能に構成され、連接部７１で相互に取り外し可能である。クランプ手段６３は、各クランプリング６１，６２に、周方向に所定の間隔を開けて配置され、直径線方向（図３の上下方向）に貫通する複数の貫通孔７２に、それぞれ個別に螺合する複数本のボルト７３によって実現される。この各ボルト７３を、直径線方向内方（図３の下方）にねじ込んで、先端部７４を各管５１，５２の突き合わせ端部６９，７０の外周面１０１，１０８に当接させることによって、各クランプリング６１，６２を各管５１，５２に固定する。さらに、周方向に所定の間隔を開けて配置された引き付けシリンダ６５が、各クランプリング６１，６２を相互に近接する方向に引き付け合わせる。
【００２０】
シール押さえリング６４は、半径方向内方（図３の下方）に臨んで開口する金属製の環状の部材であり、周方向に等間隔に複数（本実施形態では３つ）に分断可能に構成され、連接部８０で相互に取り外し可能である。このシール押さえリング６４の管軸方向（図３の左右方向）両側壁の内周部には、各管５１，５２の突き合わせ端面寄りに傾斜するシール支持面７５，７６が形成される。このシール支持面７５，７６と、各クランプリング６１，６２の相互に対向する対向表面７７，７８と、各管５１，５２の突き合わせ端部６９，７０の外周面１０１，１０８との間に、本発明の環状のシール材６６，６７が介在される。また、シール支持面７５，７６に当接するシール材６６，６７の当接面９９，１００は、周方向全周にわたって、各管５１，５２の各突き合わせ端面寄りになるにつれて、半径方向内方（図３の下方）に傾斜している。
【００２１】
上記のように、各管５１，５２にシール押さえリング６４と各シール材６６，６７とを装着することによって、シール押さえリング６４と、各管５１，５２の各突き合わせ端部６９，７０の外周面１０１，１０８とによって囲まれて形成される外部空間６０が、大気に対して気密に遮断され、この外部空間６０の空気を真空引き孔７９に接続された真空ポンプ（図示せず）によって排気することによって、この外部空間６０を５×１０^−２ｔｏｒｒ程度の真空状態とする。また環状の遮蔽部材６８が、シール押さえリング６４の周壁の内周面側に設けられる。
【００２２】
次に、本発明の実施の一形態のシール材６６，６７について説明する。なお、既設管５１の外周面１０１に取り付けられるシール材６６と、新設管５２の外周面１０８に取り付けられるシール材６７とは、同一の構造を有するため、既設管５１に取り付けられるシール材６６についてのみ説明し、新設管６７に取り付けられるシール材６７については、説明を省略する。
【００２３】
図５は、シール材６６を示す図であり、図６は図５の仮想線で示す領域８６を矢符８８方向から見た拡大図であり、図７は図５の仮想線で示す領域８６を図５の紙面の手前側から見た拡大図であり、図８（ａ）は図６の切断面線Ａ−Ａから見た断面図であり、図８（ｂ）は図５の切断面線Ｂ−Ｂから見た断面図である。なお、図６および図７では、シール材本体８１の一部を破断して示す。図５に示すように、シール材６６は、弾発性および可撓性を有するシール材本体８１と、シール材本体８１の部材軸８２方向両端部８５，８６に設けられ、一端部８５および他端部８６を相互に着脱可能に連結する連結手段８４とによって構成される。図６に示すように、連結手段８６は、シール材本体８１の一端部８５に設けられる係合部材９５と、シール材本体８１の他端部８６に設けられる係止部材９６とによって構成される。
【００２４】
次に、シール材本体８１について説明する。図６に示すように、シール材本体８１は、ゴムなどから成る円環状の部材を、周方向に沿う部材軸８２方向の一ヶ所で、切断することによって形成される。さらに詳しく述べると、部材軸８２に垂直な第１の仮想一平面８９に交差する第２の仮想一平面９０に平行に切断されて形成される。つまり、図６に示すように、シール材本体８１の一端部８５の端面９３と、他端部８６の端面９４とは、部材軸８２方向両端部を部材軸８２が共通な一直線を成すように対向させた状態で、共通な一直線を成す部材軸８２に対して、垂直な第１の仮想一平面８９に交差する第２の仮想一平面９０に平行である。なお、この第２の仮想一平面９０と共通な部材軸８２とによって成す角度θは、たとえば３０〜６０°が好ましく、本実施形態では４５°である。
【００２５】
シール材本体８１は、一端面９３から部材軸８２を通り、一方側（図６の右方）に延びる第１挿通孔９１と、他端面９４から部材軸８２を通り、他方側（図６の左方）に延びる第２挿通孔９２とを有する。これらの第１，第２挿通孔９１，９２とは、たとえばドリルによって形成される。係合部材９５の突出部９７を端面９３から突出させた状態で、第１挿通孔９１に係合部材９５が挿通され、同軸に固定される。係止部材９６が完全に埋設された状態で、第２挿通孔９２に係止部材９６が挿通され、同軸に固定される。なお、係止部材９６の係止部９８は、シール材本体８１の他端面９４から外部に臨んで露出している。
【００２６】
図８（ａ），（ｂ）に示すように、シール押さえ部材６４のシール支持面７５に当接するシール材本体８１の当接面９９と、既設管５１の外周面１０１に当接するシール材本体８１の内周面１０２とには、部材軸８２方向全長にわたって延びる突条１０３が、所定の間隔を開けて複数本形成される。これによって、シール材６６の当接面９９とシール押さえ部材６４のシール支持面７５との間が気密に遮断され、かつシール材６６の内周面１０２と既設管５１の外周面１０１との間が気密に遮断される。
【００２７】
次に、連結手段８４について説明する。図９は、連結手段８４の断面図である。図１０は、係合部材９５のナット部材１０４を示す図であり、図１１は、図１０の切断面線Ｃ−Ｃから見た断面図である。図１２は、係止部材９６の断面図であり、図１３は図１２の右方から見た係止部材９６を示す図であり、図１４は図１２の上方から見た係止部材９６を示す図であり、図１５は図１２の下方から見た係止部材９６を示す図である。
【００２８】
連結手段８４は、シール材本体８１の部材軸８２方向一端部８５に設けられる係合部材９５と、シール材本体８１の部材軸８２方向他端部８６に設けられる係止部材９６とによって構成される。
【００２９】
図９に示すように、係合部材９５は、シール材本体８１の第１挿通孔９１に完全に埋設する短円筒状のナット部材１０４と、ナット部材１０４のねじ孔１０６に螺合するボルト部材１０５とによって構成される。ナット部材１０４の外周面は、おねじ加工が施されており、外周面全体に接着材を塗布した状態で、ナット部材１０４を第１挿通孔９１にねじ込むことによって、ナット部材１０４がシール材本体８１の一端部８５に固定される。また、ナット部材１０４の中心軸線１０７とシール材本体８１の部材軸８２とは同軸である。
【００３０】
ねじ孔１０６は、ナット部材１０４の中心軸線１０７に対して偏心した状態で、ナット部材１０４を貫通する。このねじ孔１０６に、突出部９７となるボルト部材１０５が螺合する。上記のように係止部材９５が構成されるので、ボルト部材１０６のねじ込み深さを調節することによって、係合部材９５のシール材本体８１の一端面９４から突出する突出部９７の突出長さを、任意に設定することができる。
【００３１】
図１２および図１３に示すように、係止部材９６は、短円筒状の円筒部１１０と係止部９８とによって構成され、係止部９８は、円筒部１１０の中心軸線１１１に垂直な軸線１１２に関して対称に配置された一対の係止片１１３ａ，１１３ｂによって構成される。各係止片１１３ａ，１１３ｂは、円弧状の側壁部１１４ａ，１１４ｂを介して円筒部１１０の一端面１１５に連なる。各係止片１１３ａ，１１３ｂは、軸線１１２方向一方側（図１３の下方）の基部１１７ａ，１１７ｂと、基部１１７ａ，１１７ｂの他方側に連なり、軸線１１２方向他方側になるにつれて先細となる尖端部１１６ａ，１１６ｂとによって構成される。なお、対向する各尖端部１１６ａ，１１６ｂに挟まれて形成された空間である挿通部１１８の幅Ｌ１（図１５参照）は、係止部材９５のボルト部材１０５の頭部１１７の直径Ｄ１（図９参照）よりも大きく、対向する各基部１１７ａ，１１７ｂに挟まれて形成された空間である嵌合部１１９の幅Ｌ２（図１４参照）は、上記頭部１１７の直径よりも小さい。つまり、挿通部１１８の幅Ｌ１＜頭部１１７の直径Ｄ１＜嵌合部１１９の幅Ｌ２である。
【００３２】
また、円筒部１１０および係止部９８の外周面には、おねじ加工が施されており、外周面全体に接着剤を塗布し、円筒部１１０および係止部９８を第２挿通孔９２にねじ込むことによって、係止部材９６がシール材本体８１の他端部８６に完全に埋設した状態で固定される。つまり、係止部材９６の円筒部１１０および係止部９８は第２挿通孔９２内に完全に埋設し、かつ係止部９８は、第２挿通孔９２から外部に臨んで露出している。
【００３３】
以上のように構成されるシール材６６を装着するとき、シール材本体８１の内周面１０２を既設管５１の突き合わせ端部６９の外周面１０１に当接させながら、シール材本体８１を外周面１０１の全周にわたって巻き掛けた後、シール材本体８１の両端部８５，８６を連結手段８４によって連結する。さらに詳しく述べると、シール材本体８１を既設管５１に巻き掛けた後、係合部材９５の頭部１１７を、挿通部１１８から係止部９８に挿通し、頭部１１７を係止部９８に挿通したまま、軸部を、嵌合部１１９側にスライド移動させる。これによって、係合部材９５の頭部１１７が係止部９８から抜けることが阻止される。このようにして、シール材６６が既設管５１に装着される。
【００３４】
前述したように、シール材本体８１の各端面９３，９４は連結時に相互に平行であり、かつ部材軸８２に対して斜めとなるように形成されているので、各端面９３，９４の面積は、部材軸８２に対して垂直に形成された各端面の面積よりも大きい。したがって、シール材本体８１の両端部８５，８６の連結状態では、相互に接触する各端面９３，９４の接触面積が大きく、各端面９３，９４の密着性が良好であり、従来技術のシール材に比較してもシール性が損なわれない。また、このように各端面９３，９４を斜めに形成することによって、シール材本体８１を容易に連結させることができる。
【００３５】
また前述したように、係止部材９６はシール材本体８１の他端部８６に完全に埋設され、係合部材９５のナット部材１０４もシール材本体８１の一端部８５に完全に埋設されているので、シール材本体８１の両端部８５，８６の連結状態において、係合部材９５の突出部９７は、シール材本体８１の他端部８６に完全に挿入される。したがって、連結状態において、シール材本体８１の両端面９３，９４は弾発的に当接し、隙間なく密着する。
【００３６】
また同様にして、シール材６７を新設管５２の突き合わせ端部７０の外周面１０８に装着する。このように、各シール材６６，６７を、各管５１，５２の突き合わせ部５７の外周面１０１，１０８に装着することによって、突き合わせ部５７の外周側の外部空間６０を、大気に対して気密に遮断することができる。
【００３７】
シール材６６を既設管５１から取り外すとき、嵌合部１１９に嵌合している係合部材９５の頭部１１７を、挿通部１１８側にスライド移動させ、頭部１１７を係止部材９６から抜き取る。すると、シール材本体８１の一端部８５と他端部８６との連結状態が解除され、シール材６６は各管５１，５２の外周面１０１，１０８の装着位置で分離される。したがって、シール材６６を、その装着位置から移動させることなく、既設管５１から取り外すことができる。また同様にして、シール材６７を、その装着位置において、新設管５２から取り外すことができる。したがって、従来技術のように、シール材６６，６７を新設管５２の突き合わせ端部７０とは反対側の開口端部１２０まで、手作業で移動させて引き抜く作業を必要としないので、作業者の負担が低減する。
【００３８】
また、本発明のシール材６６，６７は、シール材６６，６７を突き合わせ部５７に装着する前に各管５１，５２を突き合わせたしても、突き合わせ部５７の外周面上に、シール材６６，６７を装着することができる。
【００３９】
【発明の効果】
請求項１記載の本発明によれば、連結手段はシール材本体の部材軸方向両端部に着脱可能に設けられているので、２本の管の突き合わせ溶接した後に、連結手段によるシール材本体の部材軸方向両端部の連結状態を解除することによって、シール材本体の部材軸方向両端部は管外周面上の装着位置で分離されるので、その装着位置で管の外周面上から、容易に取り外すことができる。したがって、従来技術のようにシール材を管の突き合わせ端部とは反対側の開口端部側に、手作業で移動させて引き抜く作業を必要としないので、作業者の負担が軽減する。そしてシール材本体の各端面は、連結時に相互に平行であり、かつ部材軸に対して斜めになるように形成されるので、各端面の面積は、部材軸に対して垂直に形成したときの各端面の面積よりも大きく、シール材本体の両端部を連結したとき、相互に接触する各端面の接触面積が大きく、各端面の密着性が良好となり、従来技術のシール材に比べてシール性が損なわれることがない。
【００４０】
請求項２記載の本発明によれば、係合部材の突出部が係止部材の係止部に係合することによって、シール材本体の部材軸方向一端部と他端部とが連結され、シール材本体が環状となる。このとき、係止部材がシール材本体の他端部に埋設され、係合部材を係止する係止部がシール材本体の部材軸方向他端部の端面から露出しているので、シール材本体の一端部と他端部とが連結されたとき、シール材本体の部材軸方向一端部に設けられる係合部材の突出部は、シール材本体の部材軸方向他端部に完全に挿入された状態で係止部に係止される。したがって連結状態において、シール材本体の一端面と他端面とは、弾発的に当接し、シール材本体の両端部が隙間なく密着する。
【図面の簡単な説明】
【図１】電子ビーム溶接で既設管５１と新設管５２とを突き合わせ溶接することによって、パイプラインを敷設する方法を示す図である。
【図２】図１の切断面線ＩＩ−ＩＩから見た断面図である。
【図３】図２の切断面線ＩＩＩ−ＩＩＩから見た断面図である。
【図４】既設管５１および新設管５２の突き合わせ部５３を外囲する外周側シール装置５４の分解斜視図である。
【図５】シール材６６を示す図である。
【図６】図５の仮想線で示す領域８６を矢符８８方向から見た拡大図である。
【図７】図５の仮想線で示す領域８６を図５の紙面手前から見た拡大図である。
【図８】（ａ）は、図６の切断面線Ａ−Ａから見た断面図であり、（ｂ）は図５の切断面線Ｂ−Ｂから見た断面図である。
【図９】連結手段８４の断面図である。
【図１０】係止部材９５のナット部材１０４を示す図である。
【図１１】図１０の切断面線Ｃ−Ｃから見た断面図である。
【図１２】係合部材９６の断面図である。
【図１３】図１２の右方から見た係合部材９６を示す図である。
【図１４】図１２の上方から見た係合部材９６を示す図である。
【図１５】図１２の下方から見た係合部材９６を示す図である。
【図１６】従来技術の２本の管１，２を溶接する電子ビーム溶接の管外周側シール装置６を示す断面図である。
【図１７】管外周側シール装置６の分解斜視図である。
【符号の説明】
５１既設管
５２新設管
５３突き合わせ部
５４外周側シール装置
８１シール材本体
８２部材軸
８３切断位置
８６連結手段
９５係合部材
９６係止部材
９８係止部
１０４ナット部材
１０５ボルト部材
１１０円筒部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seal for electron beam welding, which is interposed between the outer peripheral surfaces of two tubes whose end faces abut each other and a seal holding ring and is used to form an airtight external space on the outer peripheral surfaces of the tubes. About materials.
[0002]
[Prior art]
FIG. 16 is a cross-sectional view showing a tube outer peripheral sealing device 6 provided with conventional electron beam welding sealing materials 14 and 15 for welding two tubes 1 and 2, and FIG. It is an exploded perspective view of. In the laying work of a pipeline through which a fluid such as a high-pressure gas flows, the other end of the new pipe 2 is abutted against one end of the existing pipe 1 previously laid, and the butt 4 between the existing pipe 1 and the new pipe 2 is joined. The existing tube 1 and the new tube 2 are butt-welded by irradiating the electron beam 5 from the electron gun 3 disposed inside the butt portion 4. By repeating this operation sequentially and adding new pipes 2, a pipeline is laid. For the existing pipe 1 and the new pipe 2, for example, a steel pipe having a pipe diameter of 600 mmφ or more is used, and the length of the new pipe 2 to be added is, for example, about 12 m.
[0003]
In order to satisfactorily weld the existing pipe 1 and the new pipe 2 by electron beam welding, the inside of each of the pipes 1 and 2 on both sides in the pipe axis direction of the butt portion 4 is sealed with a pipe inner peripheral side sealing device (not shown). ) To form an air-tight inner space 22, and seal the outside with a tube outer-side sealing device 6 to form an air-tight outer space 21, and depressurize the inner space 22 and the outer space 21. It is necessary to make a vacuum.
[0004]
The pipe outer peripheral sealing device 6 includes a pair of clamp rings 9, 10 surrounding the butted ends 7, 8 of the existing pipe 1 and the new pipe 2, and the clamp rings 9, 10 are connected to the existing pipe 1 and the new pipe 2. 2, a clamping cylinder 11 for pulling the clamp rings 9 and 10 in a direction approaching each other (left and right directions in FIG. 16), and a pair of annular seal members 14 and 15; It is configured to include one seal holding ring 16 for holding the pair of seal members 14 and 15 and a shielding member 18 for shielding the electron beam 5.
[0005]
The seal holding ring 16 is an annular member that opens inward in the radial direction (downward in FIG. 16). Sealing members 14 and 15 are interposed between the inner peripheral surfaces 19 and 20 of both side walls of the seal holding ring 16 in the pipe axis direction (left and right directions in FIG. 16) and the outer peripheral faces of the existing pipe 1 and the new pipe 2. . The seal members 14 and 15 are endless annular or cut at one point in the axial direction of the member, are members having no connecting means, and are made of a material having elasticity and flexibility such as rubber. By mounting each member as described above, the outer space 21 surrounded by the seal holding ring 16 and the outer peripheral surfaces of the tubes 1 and 2 is airtightly shut off from the atmosphere. By evacuating the air in the outer space 21 with a vacuum pump (not shown), the outer space 21 is brought into a vacuum state.
[0006]
[Problems to be solved by the invention]
After the existing pipe 1 and the new pipe 2 are butt-welded, it is necessary to remove the pipe outer-side sealing device 6 from the butt 4. As described above, since each of the seal members 14 and 15 is annular, the seal members 14 and 15 are manually placed on the side opposite to the butted end 8 of the new pipe 2 by the operator. Is moved to the open end portion 27 and pulled out from the open end portion 27 to be removed. However, since the new pipe 2 has a length of as much as 12 m, there is a problem in that the work of pulling out the sealing members 14 and 15 by hand requires a large amount of labor and a heavy burden on the operator. In addition, since the sealing members 14 and 15 are in close contact with the outer peripheral surfaces of the existing pipe 1 and the new pipe 2 by their own elastic force, it is difficult to pull out the sealing material and the burden on the operator is large. There is. In the case of a seal material cut at one point in the axial direction of the member and having no connecting means, even if the end surface of one end of the seal material body in the axial direction of the member and the end surface of the other end are opposed to each other, the both end surfaces are in close contact. The maintained state is not maintained, and the hermetic shutoff to the atmosphere during vacuum evacuation is impaired, so that the required vacuum state cannot be reached. Therefore, there is an inefficient problem of re-adjusting the mounting state of the sealing material.
[0007]
Accordingly, it is an object of the present invention to provide a sealing material for electron beam welding, which can be easily removed from a pipe and can be hermetically shut off to the atmosphere.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the outer peripheral surface of the butted portion is interposed between the outer peripheral surface of the two tubes whose end surfaces are butted against each other and the inner peripheral surface of the seal holding ring surrounding each tube. An electron beam used in electron beam welding in which a butt portion is irradiated with an electron beam from the inside while an airtight outer space is formed on the side and the outer space and the inner space are decompressed and the two tubes are butt welded. In welding sealing materials,
A sealing material body having a length that can be wound around the entire circumference on the outer peripheral surface of each tube, and having flexibility and elasticity;
Connecting means provided at both ends in the axial direction of the member of the sealing material main body for removably connecting the both ends to each other.See
The end face of one end in the member axial direction and the end face of the other end of the seal material main body form the common straight line in a state where both ends in the member axial direction face each other so that the member axes form a common straight line. Parallel to a second virtual plane intersecting a first virtual plane perpendicular to the member axisA sealing material for electron beam welding, characterized in that:
[0009]
According to the present invention, the seal member includes a seal member body having flexibility and elasticity, and connecting means provided at both ends of the seal member body in the member axial direction. On the outer peripheral surface of each pipe on both sides of the butting portion, in a state where the sealing material main body is wound around the entire circumference, the connecting means connects the both ends of the sealing material main body in the member axial direction, so that the outer peripheral surface of the butting portion is , An annular sealing material is attached. By surrounding the annular seal material with the seal holding ring, an airtight external space is formed between the seal holding ring and the outer peripheral surface of the butted portion. The two tubes are butt-welded by irradiating the butt with an electron beam from the inside while the outer space and the inner space inside the butt are decompressed.
[0010]
As described above, since the connecting means is detachably provided at both ends in the member axial direction of the sealing material body, after butt-welding the two pipes, the connecting means is used to connect both ends of the sealing material body in the member axial direction. By releasing the connection state, both ends in the member axial direction of the sealing material main body are separated at the mounting position on the outer peripheral surface of the pipe, and thus can be easily removed from the outer peripheral surface of the pipe at the mounting position. Therefore, it is not necessary to manually move and pull out the sealing material to the opening end side opposite to the butt end of the pipe unlike the prior art, so that the burden on the operator is reduced. Further, even if the pipes are butted against each other before the sealing material is mounted on each pipe, the sealing material can be easily mounted on the outer peripheral surface of each pipe.The end surface of the one end portion in the member axial direction and the end surface of the other end portion of the seal material main body are opposed to each other in such a manner that both end portions in the member axial direction form a straight line having the same member axis, and the member forming the common straight line is formed. The axis is formed so as to be parallel to a second virtual plane that intersects a first virtual plane that is perpendicular to the member axis. That is, the respective end faces of the sealing material main body are formed so as to be parallel to each other at the time of connection and to be oblique to the member axis. As described above, since the area of each end face formed obliquely with respect to the member axis is larger than the area of each end face when formed perpendicular to the member axis, when both ends of the sealing material main body are connected. In addition, the contact area of each end face that comes into contact with each other is large, the adhesion of each end face is improved, and the sealing performance is not impaired as compared with the conventional sealing material. Further, by forming each end surface obliquely, both ends in the member axial direction of the sealing material main body can be easily connected to each other, and the connection can be easily released.
[0011]
According to a second aspect of the present invention, in the configuration of the first aspect, the connecting means includes an engaging member having a projecting portion projecting from an end surface of the sealing member main body in the axial direction of the member.
A locking member that engages with the protruding portion and is exposed from an end surface of the other end of the sealing member body in the member axial direction, and a locking member embedded in the other end of the sealing member body in the member axial direction. It is characterized by including.
[0012]
According to the present invention, the connecting means includes an engaging member having a protruding portion protruding to one side in the member axial direction from an end surface of one end in the member axial direction of the seal material main body, and the other end of the seal material main body in the member axial direction. And a locking member embedded in the base member. When the projecting portion of the engaging member engages with the locking portion of the locking member, one end and the other end of the sealing material main body in the member axial direction are connected, and the sealing material main body becomes annular. At this time, the locking member is embedded in the other end of the sealing material main body, and the locking portion for locking the engaging member is exposed from the end surface of the other end of the sealing material main body in the member axial direction. When the one end and the other end of the main body are connected, the protrusion of the engaging member provided at one end in the member axial direction of the seal material main body is completely inserted into the other end of the seal material main body in the member axial direction. In the locked state. Therefore, in the connected state, the one end face and the other end face of the sealing material body abut resiliently, making both ends of the sealing material body closely contact with each other without any gap, and the outer circumference of the pipes on both sides including the butted portions of the two pipes. An external space that is hermetically shut off on the surface can be reliably formed.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a view showing a method of laying a pipeline by butt-welding an existing pipe 51 and a new pipe 52 by electron beam welding, and FIG. 2 is viewed from a section line II-II in FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2, and FIG. 4 is an exploded perspective view of an outer peripheral side sealing device 54 surrounding the outer peripheral surfaces of the pipes 51 and 52. It is.
[0016]
A pipeline through which a fluid such as a high-pressure gas or liquid flows, abuts one end face (left side in FIG. 3) of the existing pipe 51 laid in advance with the other end face (right side in FIG. 3) of the new pipe 52. Irradiating the I groove 57 of the butted portion 53 of each tube 51, 52 with an electron beam 58 of, for example, 0.5 to 1.0 mmφ from an electron gun 56 disposed inside the tube over the entire inner peripheral surface. Thus, the pipes 51 and 52 are laid by butt welding. By repeating this operation sequentially and adding new pipes 52, a pipeline is laid. As each of the pipes 51 and 52 constituting the pipeline, for example, a round steel pipe having a pipe diameter of 500 to 1000 mmφ, a pipe thickness of 15 to 80 mm, and a pipe length of about 5 to 12 m is used.
[0017]
As described above, when the existing pipe 51 and the new pipe 52 are butt-welded by electron beam welding, the inside of each of the pipes 51 and 52 is sealed by a pipe inner peripheral side sealing device (not shown) so as to be sealed against the atmosphere. An airtight internal space 59 is formed, and the outside of each of the pipes 51 and 52 is sealed by a pipe outer peripheral sealing device 54 to form an external space 60 airtight to the atmosphere. Is evacuated by a vacuum pump (not shown) so that the inner space 59 and the outer space 60 are^-2It is necessary to reduce the pressure to about torr to make a vacuum state.
[0018]
The pipe outer peripheral sealing device 54 surrounds the butted ends 69 and 70 of the existing pipe 51 and the new pipe 52 and corrects the cross-sectional shape of each of the butted ends 69 and 70 into a perfect circle. , 62, a plurality of clamping means 63 for detachably fixing the respective clamp rings 61, 62 to the respective tubes 51, 52, and a plurality of attracting cylinders 65 for attracting the respective clamp rings 61, 62 in directions approaching each other. , A pair of seal members 66, 67 of the present invention, one seal holding ring 64 for holding the pair of seal members 66, 67, and a shielding member 68 for shielding the electron beam 58.
[0019]
Each of the clamp rings 61 and 62 is configured to be able to be divided into a plurality (three in the present embodiment) at equal intervals in the circumferential direction, and is detachable from each other at the connecting portion 71. The clamping means 63 is disposed at predetermined intervals in the circumferential direction on each of the clamp rings 61 and 62, and is individually screwed into a plurality of through holes 72 penetrating in the diameter line direction (up and down direction in FIG. 3). This is realized by a plurality of bolts 73 which are used. Each of the bolts 73 is screwed inward in the diametrical direction (downward in FIG. 3), and the distal end 74 is brought into contact with the outer peripheral surfaces 101 and 108 of the butted ends 69 and 70 of the tubes 51 and 52, respectively. Each clamp ring 61, 62 is fixed to each pipe 51, 52. Furthermore, a pulling cylinder 65 arranged at a predetermined interval in the circumferential direction pulls the clamp rings 61 and 62 in a direction approaching each other.
[0020]
The seal holding ring 64 is a metal annular member that opens inward in the radial direction (downward in FIG. 3), and is configured to be divided into a plurality (three in the present embodiment) at equal intervals in the circumferential direction. It is detachable at the connecting part 80. Seal support surfaces 75 and 76 are formed on the inner peripheral portions of both side walls of the seal holding ring 64 in the tube axis direction (the left-right direction in FIG. 3) toward the abutting end surfaces of the tubes 51 and 52. Between the seal supporting surfaces 75 and 76, the opposing surfaces 77 and 78 of the clamp rings 61 and 62, and the outer peripheral surfaces 101 and 108 of the butt ends 69 and 70 of the tubes 51 and 52, respectively. The annular sealing members 66 and 67 of the present invention are interposed. The contact surfaces 99 and 100 of the seal members 66 and 67 that contact the seal support surfaces 75 and 76 are radially inward (inward in the radial direction as the pipes 51 and 52 are closer to the abutting end surfaces over the entire circumference). (Downward in FIG. 3).
[0021]
As described above, by attaching the seal holding ring 64 and the sealing members 66 and 67 to the tubes 51 and 52, the outer periphery of the seal holding ring 64 and the butted end portions 69 and 70 of the tubes 51 and 52, respectively. An outer space 60 formed by being surrounded by the surfaces 101 and 108 is airtightly shut off from the atmosphere, and the air in the outer space 60 is exhausted by a vacuum pump (not shown) connected to a vacuum hole 79. By doing so, this external space 60 is 5 × 10^-2A vacuum state of about torr is set. An annular shielding member 68 is provided on the inner peripheral surface side of the peripheral wall of the seal holding ring 64.
[0022]
Next, the seal members 66 and 67 according to one embodiment of the present invention will be described. The seal 66 attached to the outer peripheral surface 101 of the existing pipe 51 and the seal 67 attached to the outer peripheral face 108 of the new pipe 52 have the same structure. Only the description will be given, and the description of the sealing material 67 attached to the new pipe 67 will be omitted.
[0023]
FIG. 5 is a view showing the sealing material 66, FIG. 6 is an enlarged view of an area 86 shown by a virtual line in FIG. 5 viewed from the direction of the arrow 88, and FIG. 7 is an area 86 shown by a virtual line in FIG. 8 is an enlarged view as viewed from the front side of the paper surface of FIG. 5, FIG. 8A is a cross-sectional view as viewed from a section line AA of FIG. 6, and FIG. It is sectional drawing seen from line BB. 6 and 7, a part of the sealing material main body 81 is cut away. As shown in FIG. 5, the sealing material 66 is provided at a sealing material main body 81 having elasticity and flexibility, and at both ends 85 and 86 of the sealing material main body 81 in the member shaft 82 direction. And a connecting means 84 for removably connecting the ends 86 to each other. As shown in FIG. 6, the connecting means 86 includes an engaging member 95 provided at one end 85 of the sealing material main body 81 and a locking member 96 provided at the other end 86 of the sealing material main body 81. .
[0024]
Next, the sealing material main body 81 will be described. As shown in FIG. 6, the sealing material main body 81 is formed by cutting an annular member made of rubber or the like at one position in the member axis 82 along the circumferential direction. More specifically, it is formed by being cut in parallel to a second virtual plane 90 intersecting a first virtual plane 89 perpendicular to the member axis 82. That is, as shown in FIG. 6, the end surface 93 of the one end portion 85 of the sealing material main body 81 and the end surface 94 of the other end portion 86 are formed such that both ends in the direction of the member shaft 82 form a straight line in which the member shaft 82 is common. In the opposed state, it is parallel to a second virtual one plane 90 which intersects a first virtual one plane 89 perpendicular to the member axis 82 forming a common straight line. In addition, the angle θ formed by the second virtual one plane 90 and the common member axis 82 is preferably, for example, 30 to 60 °, and is 45 ° in the present embodiment.
[0025]
The sealing material main body 81 passes through the member shaft 82 from one end surface 93 and extends to one side (to the right in FIG. 6), and the other side (see FIG. 6) through the member shaft 82 from the other end surface 94. (Left side). These first and second through holes 91 and 92 are formed by, for example, a drill. With the protrusion 97 of the engagement member 95 protruding from the end face 93, the engagement member 95 is inserted through the first insertion hole 91 and is fixed coaxially. With the locking member 96 completely buried, the locking member 96 is inserted into the second insertion hole 92 and is fixed coaxially. The locking portion 98 of the locking member 96 is exposed from the other end surface 94 of the sealing material body 81 to the outside.
[0026]
As shown in FIGS. 8A and 8B, the contact surface 99 of the seal material body 81 that contacts the seal support surface 75 of the seal holding member 64 and the seal material body that contacts the outer peripheral surface 101 of the existing pipe 51. A plurality of protrusions 103 are formed on the inner peripheral surface 102 of the member 81 at predetermined intervals to extend over the entire length in the direction of the member axis 82. Thereby, the gap between the contact surface 99 of the seal member 66 and the seal support surface 75 of the seal holding member 64 is airtightly shut off, and the gap between the inner peripheral surface 102 of the seal member 66 and the outer peripheral surface 101 of the existing pipe 51 is formed. Is airtightly shut off.
[0027]
Next, the connecting means 84 will be described. FIG. 9 is a sectional view of the connecting means 84. FIG. 10 is a diagram showing the nut member 104 of the engagement member 95, and FIG. 11 is a cross-sectional view taken along the line CC of FIG. 12 is a cross-sectional view of the locking member 96, FIG. 13 is a diagram illustrating the locking member 96 viewed from the right in FIG. 12, and FIG. 14 is a diagram illustrating the locking member 96 viewed from above in FIG. FIG. 15 is a diagram showing the locking member 96 as viewed from below in FIG.
[0028]
The connecting means 84 includes an engaging member 95 provided at one end 85 of the sealing material main body 81 in the direction of the member axis 82 and a locking member 96 provided at the other end 86 of the sealing material main body 81 in the direction of the member axis 82. You.
[0029]
As shown in FIG. 9, the engaging member 95 includes a short cylindrical nut member 104 completely embedded in the first insertion hole 91 of the sealing material main body 81, and a bolt member screwed into the screw hole 106 of the nut member 104. 105. The outer peripheral surface of the nut member 104 is subjected to external thread processing, and the nut member 104 is screwed into the first insertion hole 91 in a state where an adhesive is applied to the entire outer peripheral surface. It is fixed to one end 85 of 81. Further, the central axis 107 of the nut member 104 and the member axis 82 of the sealing material main body 81 are coaxial.
[0030]
The screw hole 106 penetrates the nut member 104 in a state of being eccentric with respect to the center axis 107 of the nut member 104. A bolt member 105 serving as the protrusion 97 is screwed into the screw hole 106. Since the locking member 95 is configured as described above, by adjusting the screwing depth of the bolt member 106, the projecting length of the projecting portion 97 of the engaging member 95 projecting from the one end face 94 of the sealing member main body 81 is adjusted. Can be set arbitrarily.
[0031]
As shown in FIGS. 12 and 13, the locking member 96 includes a short cylindrical portion 110 and a locking portion 98, and the locking portion 98 has an axis perpendicular to the central axis 111 of the cylindrical portion 110. It is constituted by a pair of locking pieces 113a and 113b symmetrically arranged with respect to 112. The locking pieces 113a and 113b are connected to one end surface 115 of the cylindrical portion 110 via the arc-shaped side walls 114a and 114b. The locking pieces 113a and 113b are connected to the bases 117a and 117b on one side in the direction of the axis 112 (downward in FIG. 13) and the other side of the bases 117a and 117b, and are tapered toward the other side in the direction of the axis 112. 116a and 116b. The width L1 (see FIG. 15) of the insertion portion 118, which is a space formed between the opposed tips 116a and 116b, is the diameter D1 of the head 117 of the bolt member 105 of the locking member 95 (see FIG. 15). 9), and a width L2 (see FIG. 14) of the fitting portion 119, which is a space formed between the opposed bases 117a and 117b, is smaller than the diameter of the head 117. That is, the width L1 of the insertion portion 118 <the diameter D1 of the head 117 <the width L2 of the fitting portion 119.
[0032]
An external thread is applied to the outer peripheral surfaces of the cylindrical portion 110 and the locking portion 98, and an adhesive is applied to the entire outer peripheral surface, and the cylindrical portion 110 and the locking portion 98 are inserted into the second insertion hole 92. By screwing, the locking member 96 is fixed in a state of being completely embedded in the other end portion 86 of the sealing material main body 81. That is, the cylindrical portion 110 and the locking portion 98 of the locking member 96 are completely buried in the second insertion hole 92, and the locking portion 98 is exposed to the outside from the second insertion hole 92.
[0033]
When the sealing material 66 configured as described above is mounted, the sealing material main body 81 is moved to the outer circumferential surface 101 while the inner peripheral surface 102 of the sealing material main body 81 is brought into contact with the outer peripheral surface 101 of the butt end portion 69 of the existing pipe 51. After being wound around the entire periphery of 101, both ends 85 and 86 of the sealing material main body 81 are connected by connecting means 84. More specifically, after the sealing material main body 81 is wound around the existing pipe 51, the head 117 of the engaging member 95 is inserted from the insertion portion 118 into the locking portion 98, and the head 117 is inserted into the locking portion 98. The shaft portion is slid toward the fitting portion 119 while being inserted. As a result, the head 117 of the engagement member 95 is prevented from coming off from the locking portion 98. Thus, the sealing material 66 is attached to the existing pipe 51.
[0034]
As described above, the end surfaces 93 and 94 of the sealing material main body 81 are formed so as to be parallel to each other at the time of connection and to be inclined with respect to the member axis 82, so that the area of each end surface 93 and 94 is small. , Are larger than the area of each end face formed perpendicular to the member axis 82. Therefore, when the both ends 85 and 86 of the sealing material main body 81 are connected, the contact area of the end faces 93 and 94 that come into contact with each other is large, and the adhesion of the end faces 93 and 94 is good. The sealability is not impaired even when compared to Further, by forming the end surfaces 93 and 94 obliquely in this manner, the sealing material main body 81 can be easily connected.
[0035]
As described above, the locking member 96 is completely embedded in the other end 86 of the sealing material main body 81, and the nut member 104 of the engaging member 95 is also completely embedded in the one end 85 of the sealing material main body 81. Therefore, in a state where both ends 85 and 86 of the sealing material main body 81 are connected, the protruding portion 97 of the engaging member 95 is completely inserted into the other end 86 of the sealing material main body 81. Therefore, in the connected state, both end surfaces 93 and 94 of the sealing material main body 81 resiliently come into contact with each other without any gap.
[0036]
Similarly, the sealing material 67 is attached to the outer peripheral surface 108 of the butt end 70 of the new pipe 52. In this manner, by attaching the seal members 66 and 67 to the outer peripheral surfaces 101 and 108 of the butted portions 57 of the pipes 51 and 52, the outer space 60 on the outer peripheral side of the butted portions 57 is airtight to the atmosphere. Can be shut off.
[0037]
When removing the sealing material 66 from the existing pipe 51, the head 117 of the engaging member 95 fitted to the fitting part 119 is slid toward the insertion part 118, and the head 117 is removed from the locking member 96. . Then, the connection state between the one end portion 85 and the other end portion 86 of the sealing material main body 81 is released, and the sealing material 66 is separated at the mounting position of the outer peripheral surfaces 101 and 108 of the pipes 51 and 52. Therefore, the sealing member 66 can be removed from the existing pipe 51 without moving from the mounting position. Similarly, the seal member 67 can be removed from the new pipe 52 at the mounting position. Therefore, unlike the related art, there is no need to manually move and pull out the seal members 66 and 67 to the open end 120 opposite to the butt end 70 of the new pipe 52, so that it is not necessary for the operator. The burden is reduced.
[0038]
In addition, even if the pipes 51 and 52 are butted before the sealing members 66 and 67 are attached to the butting portion 57, the sealing members 66 and 67 of the present invention can be formed on the outer peripheral surface of the butting portion 57. , 67 can be mounted.
[0039]
【The invention's effect】
According to the first aspect of the present invention, since the connecting means is detachably provided at both ends in the member axial direction of the sealing material main body, after the two pipes are butt-welded, the connection of the sealing material main body by the connecting means is performed. By releasing the connection state of both ends in the member axial direction, both ends in the member axial direction of the sealing material main body are separated at the mounting position on the outer peripheral surface of the pipe. Can be removed. Therefore, it is not necessary to manually move and pull out the sealing material to the opening end side opposite to the butt end of the pipe unlike the prior art, so that the burden on the operator is reduced.And since each end face of the sealing material main body is parallel to each other at the time of connection, and is formed so as to be oblique with respect to the member axis, the area of each end face is equal to that when formed perpendicular to the member axis. Larger than the area of each end face, when the both ends of the sealing material body are connected, the contact area of each end face that comes into contact with each other is large, the adhesion of each end face is good, and the sealing performance is better than that of the conventional sealing material. Is not impaired.
[0040]
According to the second aspect of the present invention, one end and the other end of the sealing member main body in the member axial direction are connected by engaging the protrusion of the engagement member with the locking portion of the locking member, The sealing material body becomes annular. At this time, the locking member is embedded in the other end of the sealing material main body, and the locking portion for locking the engaging member is exposed from the end surface of the other end of the sealing material main body in the member axial direction. When the one end and the other end of the main body are connected, the protrusion of the engagement member provided at one end in the member axial direction of the seal material main body is completely inserted into the other end of the seal material main body in the member axial direction. In the locked state. Therefore, in the connected state, the one end face and the other end face of the sealing material main body resiliently contact, and both ends of the sealing material main body are in close contact with no gap.
[Brief description of the drawings]
FIG. 1 is a diagram showing a method of laying a pipeline by butt welding an existing pipe 51 and a new pipe 52 by electron beam welding.
FIG. 2 is a cross-sectional view taken along section line II-II in FIG.
FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2;
FIG. 4 is an exploded perspective view of an outer peripheral side sealing device that surrounds an abutting portion 53 of an existing pipe 51 and a new pipe 52.
FIG. 5 is a view showing a sealing material 66;
FIG. 6 is an enlarged view of a region 86 indicated by a virtual line in FIG.
FIG. 7 is an enlarged view of a region 86 indicated by a virtual line in FIG. 5 as viewed from the front of the paper of FIG. 5;
8A is a cross-sectional view taken along the line AA of FIG. 6; FIG. 8B is a cross-sectional view taken along the line BB of FIG. 5;
FIG. 9 is a sectional view of the connecting means 84.
FIG. 10 is a view showing a nut member 104 of a locking member 95.
FIG. 11 is a cross-sectional view taken along the line CC of FIG. 10;
FIG. 12 is a cross-sectional view of an engagement member 96.
FIG. 13 is a view showing the engagement member 96 as viewed from the right in FIG.
14 is a view showing the engagement member 96 as viewed from above in FIG.
FIG. 15 is a view showing the engagement member 96 as viewed from below in FIG. 12;
FIG. 16 is a cross-sectional view showing a tube outer peripheral side sealing device 6 of electron beam welding for welding two tubes 1 and 2 of the prior art.
FIG. 17 is an exploded perspective view of the tube outer peripheral sealing device 6.
[Explanation of symbols]
51 Existing pipe
52 New pipe
53 Butt
54 Outer side sealing device
81 Sealing material body
82 Member axis
83 Cutting position
86 Connecting means
95 Engagement member
96 Locking member
98 Locking part
104 Nut member
105 bolt member
110 cylindrical part

Claims

An airtight external space is formed on the outer peripheral side of the butt portion between the outer peripheral surfaces of the two pipes whose end faces are butted against each other and the inner peripheral face of the seal holding ring surrounding each pipe. In a state where the outer space and the inner space are decompressed, the butt portion is irradiated with an electron beam from the inside to butt-weld the two pipes.
A sealing material body having a length that can be wound around the entire circumference on the outer peripheral surface of each tube, and having flexibility and elasticity;
Provided member axial end portions of the sealing member main body, seen including a connecting means for mutually detachably connecting the end portions,
The end face of one end in the member axial direction and the end face of the other end of the seal material main body form the common straight line in a state where both ends in the member axial direction face each other so that the member axes form a common straight line. A sealing material for electron beam welding, wherein the sealing material is parallel to a second virtual one plane intersecting a first virtual one plane perpendicular to the member axis .

An engagement member having a protruding portion that protrudes from an end surface of one end of the sealing member main body in the member axial direction;
A locking member that engages with the protruding portion and is exposed from an end surface of the other end of the sealing member body in the member axial direction, and a locking member embedded in the other end of the sealing member body in the member axial direction. The sealing material for electron beam welding according to claim 1, wherein the sealing material is included.