【０００１】
【発明の属する技術分野】
この発明は、鋼製パイプや鉄筋のような軸状物の接続に用いるねじ継手に関する。
【０００２】
【従来の技術】
鋼製パイプで各種流体の管路を形成する場合に、鋼製パイプを接続するための継手が必要になり、また、建設現場において、鉄筋を同軸心に接続する場合にも継手が用いられる。
【０００３】
従来、鋼製パイプの接続に用いられるねじ継手は、継手部材の内部両端にテーパ雌ねじを形成し、鋼製パイプをこのテーパ雌ねじに両端部から螺合することにより接続するような構造になっている（特許文献１参照）。
【０００４】
また、鉄筋を直線状に接続する従来のねじ継手は、片側の鉄筋の端部に袋ナットを溶接し、反対側の鉄筋の端部にボルトを溶接し、上記袋ナットにボルトをねじ込んで両鉄筋を接続する構造になっている（特許文献２参照）。
【０００５】
【特許文献１】
特開平９−１１９５６５号公報（図１）
【特許文献２】
特開平８−２６１２１６号公報（図１）
【０００６】
【発明が解決しようとする課題】
ところで、上記した前者の鋼製パイプ用のねじ継手は、継手部材に対して鋼製パイプを回転させながらねじ込む必要があり、鋼製パイプが長尺や屈曲している場合に、接続作業が行いにくいだけでなく、鋼製パイプの端部を突き合わせた状態の接続を得るのが困難であるという問題がある。
【０００７】
また、上記した後者の鉄筋用ねじ継手は、両鉄筋の接続に鉄筋を回転させながらねじ込む必要があり、鉄筋が長尺や屈曲している場合に、接続作業が行いにくいだけでなく、鉄筋の端部を直接突き合わせた状態の接続を得ることができないので、軸方向の圧縮荷重に対する接続強度の点で不安がある。
【０００８】
そこで、この発明の課題は、鋼製パイプや鉄筋の接続において、鋼製パイプや鉄筋を回転させることなく接続が行え、現場の作業条件に左右されることなく接続作業が能率よく簡単に行えると共に、鋼製パイプや鉄筋の端部を直接突き合わせた接続が行え、軸方向の圧縮荷重に対して強度的に優れた接続が得られるねじ継手を提供することにある。
【０００９】
【課題を解決するための手段】
上記のような課題を解決するため、請求項１の発明は、外面にそれぞれ雄ねじが形成された被接続部材の一方に外嵌螺合する第１接続筒と、他方に外嵌螺合する第２接続筒とからなり、第１接続筒の外面に雄ねじを形成し、上記第２接続筒に第１接続筒へ外嵌する筒状延長部を設け、この筒状延長部の内面に第１接続筒の外面の雄ねじに螺合する雌ねじを形成した構成を採用したものである。
【００１０】
ここで、上記被接続部材は、鋼製パイプもしくはねじ節鉄筋であり、被接続部材の外面に形成された雄ねじは、鋼製パイプの場合、その外面に雄ねじを切削加工すると共に、ねじ節鉄筋の場合は、外面に設けられている雄ねじを直接使用し、第１接続筒と第２接続筒の内面に設けた雌ねじはこのねじ節鉄筋の雄ねじに螺合するように形成する。
【００１１】
請求項２の発明は、外面にそれぞれ雄ねじが形成された被接続部材のそれぞれに外嵌螺合する二つの内側接続筒と、両内側接続筒にわたって外嵌する外側接続筒とからなり、上記内側接続筒の外面にそれぞれ雄ねじを形成し、上記外側接続筒の内面に、両内側接続筒の雄ねじに螺合する雌ねじを形成した構成を採用したものである。
【００１２】
上記被接続部材は、鋼製パイプもしくはねじ節鉄筋であり、被接続部材の外面に形成された雄ねじは、鋼製パイプの場合、その外面に雄ねじを切削加工すると共に、ねじ節鉄筋の場合は、外面に設けられている雄ねじを直接使用し、両内側接続筒の内面に設けた雌ねじはこのねじ節鉄筋の雄ねじに螺合するように形成する。
【００１３】
請求項３の発明は、互いに接続せんとする被接続部材の端部に拡径部を設け、外面に雄ねじが形成され、一方の被接続部材に外嵌して拡径部で抜け止め状となる第１接続筒と、他方の被接続部材に拡径部で抜け止め状となるよう嵌合し、第１接続筒に対して外嵌する第２接続筒を有し、上記第２接続筒の内面に第１接続筒の外面の雄ねじに螺合する雌ねじを形成した構成を採用したものである。
【００１４】
この請求項３の発明において、被接続部材は鋼製パイプであり、端部の拡径部はフランジに形成され、第１接続筒の外径及び第２接続筒の内径は、拡径部よりも少し大径となっている。
【００１５】
請求項４の発明は、互いに接続せんとする被接続部材の端部に拡径部を設け、両被接続部材のそれぞれに拡径部で抜け止め状となるよう外嵌する二つの内側接続筒と、両内側接続筒にわたって外嵌する外側接続筒とを有し、上記内側接続筒の外面にそれぞれ雄ねじを形成し、上記外側接続筒の内面に、両内側接続筒の雄ねじに螺合する雌ねじを形成した構成を採用したものである。
【００１６】
上記請求項４の発明において、被接続部材は鋼製パイプであり、端部の拡径部はフランジで形成するほか、端部を弧状に膨出させることによって形成し、内側接続筒の外径及び外側接続筒の内径は、拡径部と同径かそれよりも少し大径となっている。
【００１７】
【発明の実施の形態】
以下、この発明の実施の形態を図示例と共に説明する。
【００１８】
図１に示す第１の実施の形態のねじ継手は、被接続部材が鋼製パイプの場合であり、互いに接続せんとする鋼製パイプ１、１の端部外面にそれぞれ雄ねじ２が切削によって形成され、一方の鋼製パイプ１に外嵌螺合する第１接続筒３と、他方の鋼製パイプ１に外嵌螺合する第２接続筒４とを備え、この第１接続筒３と第２接続筒４の内面に上記雄ねじ２と螺合する雌ねじ５がそれぞれ形成されている。
【００１９】
上記第１接続筒３の外面に雄ねじ６を形成し、上記第２接続筒４には第１接続筒３へ外嵌する筒状延長部７を設け、この筒状延長部７の内面に第１接続筒３の外面の雄ねじ６に螺合する雌ねじ８が形成されている。
【００２０】
なお、上記した雄ねじ２、６と雌ねじ５、８は共に右ねじに形成され、上記第２接続筒４の外形は、円形でもよいが回転操作が円滑に行えるように、多角形に形成するのが好ましく、また、第１接続筒３において、第２接続筒４を螺合するのと反対側の端部に、外形が多角形の回転操作用ナット部９が設けてある。
【００２１】
第１の実施の形態のねじ継手は、上記のような構成であり、鋼製パイプ１、１を接続するには、一方の鋼製パイプ１に第１接続筒３と他方の鋼製パイプ１に第２接続筒４をそれぞれ螺合し、一方の鋼製パイプ１の端部に第１接続筒３の端部を一致させ、一方の鋼製パイプ１と第１接続筒３の上記状態を固定化し、また、第２接続筒４は他方の鋼製パイプ１に対して内側の位置にまでねじ込んでおき、両鋼製パイプ１と１の端部を互いに当接させた状態で、第２接続筒４を右回転させてその筒状延長部７を第１接続筒３に螺合し、筒状延長部７の根元部分に形成した段部１０が第１接続筒３の端面に当接したねじ込み完了後に、第１接続筒３を一方の鋼製パイプ１と第２接続筒４に対して左回動させ、雄ねじ２、６と雌ねじ５、８の送り作用で一方の鋼製パイプ１に他方鋼製パイプ１へ向けての送りを与える。
【００２２】
上記接続時において、第２接続筒４は、第１接続筒３側へ回動しながら移動することによりその筒状延長部７が第１接続筒３側に雄ねじ６と雌ねじ８の螺合によって外嵌し、第２接続筒４の内部で筒状延長部７の根元部分に形成した段部１０が第１接続筒３の端面に当接した状態で、第１接続筒３を左回動させて、一方の鋼製パイプ１に他方鋼製パイプ１に向けて送りを与えることで、両鋼製パイプ１と１は互いの端部が圧着した圧縮荷重状態で接続されることになる。
【００２３】
次に、図２に示す第２の実施の形態のねじ継手は、被接続部材がねじ節鉄筋の場合の例であり、基本的な構造は第１の実施の形態のねじ継手と同一であるので、同一部分に同一符号を付して説明に代える。
【００２４】
上記ねじ節鉄筋１ａは、その外周面に比較的大きなピッチで右ねじの雄ねじ１１が設けられている既知の構造を有し、第１接続筒３と第２接続筒４の各雌ねじ５は、このねじ節鉄筋１ａの雄ねじ１１に螺合するように形成されている。
【００２５】
この第２の実施の形態のねじ継手でねじ節鉄筋１ａを接続するには、図２（Ａ）のように、一方のねじ節鉄筋１ａに第１接続筒３と他方のねじ節鉄筋１ａに第２接続筒４をそれぞれ螺合し、一方のねじ節鉄筋１ａの端部に第１接続筒３の端部を一致させ、この一方のねじ節鉄筋１ａと第１接続筒３の上記状態を固定化し、また、第２接続筒４は他方のねじ節鉄筋１ａに対して内側の位置にまでねじ込んでおき、両ねじ節鉄筋１ａの端部を互いに当接させた状態で、第２接続筒４を右回転させて筒状延長部７を第１接続筒３に螺合し、筒状延長部７の根元部分に形成した段部１０が第１接続筒３の端面に当接したねじ込み完了後に、第１接続筒３を一方のねじ節鉄筋１ａと第２接続筒４に対して左回動させ、雄ねじ６、１１と雌ねじ５、８の送り作用で一方のねじ節鉄筋１ａに他方ねじ節鉄筋１ａへ向けての送りを与える。
【００２６】
上記接続時において、第２接続筒４の内部で筒状延長部７の根元部分に形成した段部１０が第１接続筒３の端面に当接した状態で、第１接続筒３を左回動させて、一方のねじ節鉄筋１ａに他方ねじ節鉄筋１ａに向けて送りを与えることで、両ねじ節鉄筋１ａと１ａは互いの端部が圧着した圧縮荷重状態で接続されることになる。
【００２７】
図３に示す第３の実施の形態のねじ継手は、被接続部材が鋼製パイプの場合であり、互いに接続せんとする鋼製パイプ１、１の端部外面にそれぞれ雄ねじ２が切削によって形成され、両鋼製パイプ１、１のそれぞれに雌ねじ１２で外嵌螺合する二つの内側接続筒１３、１３と、両内側接続筒１３、１３にわたって外嵌する外側接続筒１４とからなり、上記内側接続筒１３、１３の外面にそれぞれ雄ねじ１５を形成し、上記外側接続筒１４の内面に、両内側接続筒１３、１３の雄ねじ１５に螺合する雌ねじ１６が形成されている。
【００２８】
なお、外側接続筒１４の外形は、円形でもよいが回転操作が円滑に行えるように、多角形に形成するのが好ましく、また、何れか一方の内側接続筒１３において、外側接続筒１４から突出する側の端部に、外形が多角形の回転操作用ナット部１７が設けてある。
【００２９】
この第３の実施の形態のねじ継手で鋼製パイプ１を接続するには、図３のように、両鋼製パイプ１、１にそれぞれ内側接続筒１３、１３を螺合し、両鋼製パイプ１、１の端部に内側接続筒１３の端部を一致させ、外側接続筒１４を一方の内側接続筒１３に、その端部がこの内側接続筒１３の端部から没入する位置にまでねじ込んでおき、両鋼製パイプ１、１と両内側接続筒１３、１３の端部を互いに当接させた状態で、外側接続筒１４を回動させて雄ねじ１５と雌ねじ１６の螺合で両内側接続筒１３、１３にわたって略均等に外嵌する位置に移動させる。
【００３０】
上記接続時において、外側接続筒１４は、回動しながら移動することにより両内側接続筒１３、１３にわたって外嵌し、両鋼製パイプ１、１と両内側接続筒１３、１３の端部を互いに当接させた状態で、両内側接続筒１３、１３の何れか一方を固定となる鋼製パイプ１と外側接続筒１４に対して左回動させると、雄ねじ２、１５と雌ねじ１２、１６の作用で一方の鋼製パイプ１に他方の鋼製パイプ１に向けて送りが与えられ、両鋼製パイプ１、１は互いの端部が圧着した圧縮荷重状態で接続されることになる。
【００３１】
図４に示す第４の実施の形態のねじ継手は、被接続部材がねじ節鉄筋の場合の例であり、基本的な構造は第３の実施の形態のねじ継手と同一であるので、同一部分に同一符号を付して説明に代える。
【００３２】
上記ねじ節鉄筋１ａは、その外面に比較的大きなピッチで雄ねじ１１が設けられている構造を有し、両内側接続筒１３、１３の雌ねじ１２は、このねじ節鉄筋１ａの雄ねじ１１に螺合するように形成されている。
【００３３】
この第４の実施の形態のねじ継手でねじ節鉄筋を接続するには、図４（Ａ）のように、両ねじ節鉄筋１ａ、１ａにそれぞれ内側接続筒１３、１３を螺合し、両ねじ節鉄筋１ａ、１ａの端部に内側接続筒１３、１３の端部を一致させ、外側接続筒１４を一方の内側接続筒１３に、その端部がこの内側接続筒１３の端部から没入する位置にまでねじ込んでおき、両ねじ節鉄筋１ａ、１ａと両内側接続筒１３、１３の端部を互いに当接させた状態で、外側接続筒１４を回動させて雄ねじ１５と雌ねじ１６の螺合で両内側接続筒１３、１３にわたって略均等に外嵌する位置に移動させる。
【００３４】
上記外側接続筒１４は、回動しながら移動することにより他方の内側接続筒１３に雄ねじ１５と雌ねじ１６の螺合によって、図４（Ｂ）の如く、外側接続筒１４が両内側接続筒１３、１３に対して略均等に嵌合し、この後、両内側接続筒１３、１３の何れか一方を固定となるねじ節鉄筋１ａと外側接続筒１４に対して左回動させると、雄ねじ１１、１５と雌ねじ１２、１６の作用で一方のねじ節鉄筋１ａが他方のねじ節鉄筋１ａに向けて送りを与えられ、両ねじ節鉄筋１ａ、１ａは互いの端部が圧着した圧縮荷重状態で接続されることになる。
【００３５】
図５に示す第５の実施の形態のねじ継手は、被接続部材が鋼製パイプの場合であり、互いに接続せんとする鋼製パイプ１、１の端部に拡径部であるフランジ１８を設け、一方の鋼製パイプ１に外嵌してフランジ１８で軸方向の抜け止め状となり、内面がねじ無しで、外面に雄ねじ１９が形成された第１接続筒２０と、他方の鋼製パイプ１にフランジ１８で抜け止め状となるよう嵌合し、第１接続筒２０に対して外嵌する第２接続筒２１を有し、上記第２接続筒２１の内面に第１接続筒２０の雄ねじ１９に螺合する雌ねじ２２が形成されている。
【００３６】
上記第１接続筒２０の外径及び第２接続筒２１の内径は、フランジ１８よりも少し大径となっていると共に、第２接続筒２１の一方端部はフランジ１８よりも小径で鋼製パイプ１に外嵌する内径の鍔壁２３を有し、他方の鋼製パイプ１に外嵌してフランジ１８で軸方向の抜け止め状となる。
【００３７】
この第５の実施の形態のねじ継手で鋼製パイプを接続するには、図５のように、一方の鋼製パイプ１に第１接続筒２０と他方の鋼製パイプ１に第２接続筒２１をそれぞれフランジ１８の取り付け又は加工前に嵌挿しておき、両鋼製パイプ１、１のフランジ１８を当接させた状態で、第１接続筒２０を一方の鋼製パイプ１のフランジ１８側に位置させ、第２接続筒２１をこの第１接続筒２０にねじ込むと、第１接続筒２０の端部と第２接続筒２１の鍔壁２３で両鋼製パイプ１、１のフランジ１８が挟み込まれ、両鋼製パイプ１、１は端部が互いに圧接する状態で接続されることになる。
【００３８】
図示の場合、両鋼製パイプ１、１のフランジ１８、１８の対向面間にパッキン材２４を介在させ、両鋼製パイプ１、１の接続部分のシール性を向上させた例を示している。
【００３９】
図６に示す第６の実施の形態のねじ継手は、被接続部材が鋼製パイプの場合であるが、構造的には、上述した第３の実施の形態のねじ継手と同一であるので、第３の実施の形態と同一符号を付して説明する。
【００４０】
図６において、互いに接続せんとする鋼製パイプ１の端部に拡径部であるフランジ１８を設け、両鋼製パイプ１のそれぞれに外嵌する二つの内側接続筒１３、１３と、両内側接続筒１３、１３にわたって外嵌する外側接続筒１４とからなり、上記内側接続筒１３、１３は、内面をねじ無しとし、外面にそれぞれ雄ねじ１５を形成し、上記外側接続筒１４の内面に、両内側接続筒１３、１３の雄ねじ１５に螺合する雌ねじ１６が形成されている。
【００４１】
上記内側接続筒１３、１３の外径及び外側接続筒１４の内径は、フランジ１８よりも少し大径となっていると共に、外側接続筒１４の外形は、円形でもよいが回転操作が円滑に行えるように、多角形に形成するのが好ましく、また、何れか一方の内側接続筒１３において、外側接続筒１４から突出する側の端部に、外形が多角形の回転操作用ナット部１７が設けてある。
【００４２】
この第６の実施の形態のねじ継手で鋼製パイプ１を接続するには、図６のように、両鋼製パイプ１、１にそれぞれ内側接続筒１３、１３をフランジ１８の取り付け又は加工前に嵌挿しておき、外側接続筒１４を一方の内側接続筒１３に、その端部がこの内側接続筒１３の端部から没入する位置にまでねじ込み、この状態で両鋼製パイプ１のフランジ１８を当接させ、両内側接続筒１３、１３をそれぞれの鋼製パイプ１、１のフランジ１８側に位置させた状態で、外側接続筒１４を回動させ、雄ねじ１５と雌ねじ１６の送り作用で他方の内側接続筒１３側に移動させる。
【００４３】
上記外側接続筒１４は、回動しながら移動することにより他方の内側接続筒１３に雄ねじ１５と雌ねじ１６の螺合によって外嵌し、外側接続筒１４が両内側接続筒１３、１３に対して略均等に嵌合させた後、両内側接続筒１３、１３の何れか一方を固定となる外側接続筒１４に対してねじ込むと、両フランジ１８、１８が両内側接続筒１３、１３で両側から挟まれ、両鋼製パイプ１、１は互いの端部が圧着した圧縮荷重状態で接続されることになる。
【００４４】
図示の場合、両フランジ１８の対向面間にパッキン材２４を介在させ、両鋼製パイプ１の接続部分のシール性を向上させている。
【００４５】
図７に示す第７の実施の形態のねじ継手は、上記第６の実施の形態の変形例であり、第６の実施の形態と同一部分には同一符号を付して説明に代える。
【００４６】
この第７の実施の形態は、鋼製パイプ１、１の互いに接続せんとする端部に設けた拡径部が、鋼製パイプ１の周壁を外方へ膨出させた弧状拡径部１８ａによって形成され、両内側接続筒１３、１３の弧状拡径部１８ａに臨む端部は、図示の場合、軸心に対して直角とし、上記弧状拡径部１８ａの端部対向面間にシール材２４を介在させたものであり、この第７の実施の形態のねじ継手による鋼製パイプ１の接続は、上述した第６の実施の形態と同様の手順と操作によって行うことができる。
【００４７】
なお、上記した第５乃至第７の実施の形態のねじ継手は、鋼製パイプ１の端部に拡径のフランジ１８や弧状拡径部１８ａが設けてあるので、第１接続筒２０や第２接続筒２１及び内側接続筒１３は、フランジ１８や弧状拡径部１８ａの加工前に鋼製パイプ１へ予め嵌挿しておくことが必要になる。
【００４８】
そこで、図８と図９は、フランジ１８や弧状拡径部１８ａを設けた後に、第１接続筒２０や第２接続筒２１及び内側接続筒１３を用い、所謂後付けによって接続することができる第８と第９の実施の形態のねじ継手を示している。
【００４９】
図８の第８の実施の形態は、構造的に第５の実施の形態に該当し、第１接続筒２０と第２接続筒２１に組合わせ使用する一対の分割抜け止め部材３１が用意されている。
【００５０】
外径に雄ねじ１９を設けた第１接続筒２０は、その内径がフランジ１８を通過することのできるように形成され、第２接続筒２１は、雌ねじ２２によって第１接続筒２０に外嵌螺合する筒部２１ａの一端に内側小径部２１ｂを設け、この内側小径部２１ｂがフランジ１８に対して通過できる内径となり、その内端に段部２１ｃを形成している。
【００５１】
上記分割抜け止め部材３１は、内径が鋼製パイプ１に嵌合し、外径が第１接続筒２０又は内側小径部２１ｂに嵌合する二つ割りの筒状に形成され、一方の端部に第２接続筒２１の筒部２１ａ内に収まる外径の鍔部３２が設けられている。
【００５２】
この第８の実施の形態のねじ継手で鋼製パイプ１を接続するには、両鋼製パイプ１、１にそれぞれフランジ１８を形成した後、一方の鋼製パイプ１に第１接続筒２０と他方の鋼製パイプ１に第２接続筒２１を嵌挿し、この状態で両鋼製パイプ１、１の端部フランジ１８を当接させ、両鋼製パイプ１、１に分割抜け止め部材３１をその鍔部３２がフランジ１８に当接するように外嵌し、第１接続筒２０を移動させて一方分割抜け止め部材３１にその端部が鍔部３２に当接するよう外嵌し、第２接続筒２１を移動させて内側小径部２１ｂを他方分割抜け止め部材３１の鍔部３２が段部２１ｃに当接するよう外嵌し、この第２接続筒２１の筒部２１ａを第１接続筒２０に螺合する。
【００５３】
上記第２接続筒２１の螺合後に、第１接続筒２０を更にねじ込むと、両鋼製パイプ１、１は互いのフランジ１８、１８が両側から挟圧され、両鋼製パイプ１、１は端部が圧着した圧縮荷重状態で接続されることになる。
【００５４】
図９の第９の実施の形態は、構造的に第６と７の実施の形態に該当し、二つの内側接続筒１３、１３と、両内側接続筒１３、１３にわたって外嵌する外側接続筒１４に組合わせ使用する一対の分割抜け止め部材３１が用意されている。
【００５５】
外径に雄ねじを設けた内側接続筒１３は、その内径がフランジ１８を通過することのできるように形成され、外側接続筒１４は、雌ねじ１６によって内側接続筒１３、１３に外嵌螺合するように形成されている。
【００５６】
上記分割抜け止め部材３１は、内径が鋼製パイプ１に嵌合し、外径が内側接続筒１３に嵌合する二つ割りの筒状に形成され、一方の端部に外側接続筒１４の内部に収まる外径の鍔部３２が設けられている。
【００５７】
この第９の実施の形態のねじ継手で鋼製パイプ１を接続するには、両鋼製パイプ１、１にそれぞれフランジ１８、１８を形成した後、両鋼製パイプ１、１に内側接続筒１３を嵌挿し、一方の内側接続筒１３に外側接続筒１４を外嵌螺合し、この状態で両鋼製パイプ１、１の端部フランジ１８を当接させ、両鋼製パイプ１、１に分割抜け止め部材３１をその鍔部３２がフランジ１８に当接するように外嵌し、内側接続筒１３を移動させて分割抜け止め部材３１にその端部が鍔部３２に当接するよう外嵌し、この状態で外側接続筒１４を回動させて他方内側接続筒１３に外嵌螺合する。
【００５８】
上記外側接続筒１４を両内側接続筒１３、１３にわたって螺合した後に、何れかの内側接続筒１３を更にねじ込むと、両鋼製パイプ１、１は互いのフランジ１８が両内側接続筒１３、１３で挟圧され、両鋼製パイプ１、１は端部が圧着した圧縮荷重状態で接続されることになる。
【００５９】
【発明の効果】
以上のように、この発明によると、上記のような構成としたので、鋼製パイプや鉄筋の接続において、鋼製パイプや鉄筋を回転させることなく接続が行え、現場の作業条件に左右されることなく接続作業が能率よく簡単に行えると共に、鋼製パイプや鉄筋の端部を直接突き合わせた圧縮荷重状態の接続が行え、軸方向の圧縮や引っ張り荷重に対して強度的に優れた接続が得られることになる。
【００６０】
また、被接続部材を端部に設けた拡径部を利用して接続する場合、拡径部にボルト締めのための孔加工が不要になり、拡径部の外径が小さくなることで、作業性の向上や材料コストの削減が図れる。
【図面の簡単な説明】
【図１】ねじ継手の第１の実施の形態を示す接続状態の縦断面図
【図２】（Ａ）はねじ継手の第２の実施の形態を示す接続前の状態の縦断面図、（Ｂ）は同接続状態の縦断面図
【図３】ねじ継手の第３の実施の形態を示す接続状態の縦断面図
【図４】（Ａ）はねじ継手の第４の実施の形態を示す接続前の状態の縦断面図、（Ｂ）は同接続状態の縦断面図
【図５】ねじ継手の第５の実施の形態を示す接続状態の縦断面図
【図６】ねじ継手の第６の実施の形態を示す接続状態の縦断面図
【図７】ねじ継手の第７の実施の形態を示す接続状態の縦断面図
【図８】ねじ継手の第８の実施の形態を示す接続状態の縦断面図
【図９】ねじ継手の第９の実施の形態を示す接続状態の縦断面図
【符号の説明】
１ 鋼製パイプ
２ 雄ねじ
３ 第１接続筒
４ 第２接続筒
５ 雌ねじ
６ 雄ねじ
７ 延長部
８ 雌ねじ
９ 回転操作用ナット部
１０ 段部
１１ 雄ねじ
１２ 雌ねじ
１３ 内側接続筒
１４ 外側接続筒
１５ 雄ねじ
１６ 雌ねじ
１７ 回転操作用ナット部
１８ フランジ
１９ 雄ねじ
２０ 第１接続筒
２１ 第２接続筒
２２ 雌ねじ
２３ 鍔壁
２４ パッキン材
３１ 分割抜け止め部材
３２ 鍔部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a threaded joint used for connecting a shaft-like object such as a steel pipe or a reinforcing bar.
[0002]
[Prior art]
Joints for connecting steel pipes are required when forming pipes for various fluids with steel pipes, and joints are also used when connecting rebars coaxially at construction sites.
[0003]
Conventionally, a threaded joint used for connecting a steel pipe has a structure in which tapered female threads are formed at both inner ends of a joint member, and the steel pipe is connected to the tapered female thread by screwing the same from both ends. (See Patent Document 1).
[0004]
In a conventional threaded joint for connecting rebars in a straight line, a cap nut is welded to one end of the rebar, a bolt is welded to the end of the rebar on the other side, and a bolt is screwed into the cap nut. It has a structure for connecting reinforcing bars (see Patent Document 2).
[0005]
[Patent Document 1]
JP-A-9-119565 (FIG. 1)
[Patent Document 2]
JP-A-8-261216 (FIG. 1)
[0006]
[Problems to be solved by the invention]
By the way, the former threaded joint for steel pipe needs to be screwed while rotating the steel pipe with respect to the joint member, and when the steel pipe is long or bent, the connection work is performed. Not only is it difficult, but also it is difficult to obtain a connection with the ends of the steel pipes abutting each other.
[0007]
In addition, the latter threaded joint for rebar needs to be screwed while rotating the rebar to connect both rebars, and when the rebar is long or bent, not only is the connection work difficult, but also the rebar Since it is not possible to obtain a connection in which the ends are directly abutted with each other, there is an anxiety in connection strength against an axial compressive load.
[0008]
Therefore, an object of the present invention is to connect steel pipes and rebars without rotating the steel pipes and rebars, and to perform connection work efficiently and easily without being affected by work conditions at the site. Another object of the present invention is to provide a threaded joint capable of performing a connection in which ends of steel pipes and reinforcing bars are directly abutted to each other and obtaining a connection excellent in strength against an axial compressive load.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 provides a first connection cylinder externally threadedly engaged with one of the connected members each having an external thread formed on the external surface, and a second connection cylinder externally threadedly engaged with the other. The first connection cylinder is formed with a male screw on the outer surface thereof, and the second connection cylinder is provided with a cylindrical extension that fits over the first connection cylinder. This adopts a configuration in which a female screw that is screwed to a male screw on the outer surface of the connection cylinder is formed.
[0010]
Here, the connected member is a steel pipe or a screw joint rebar, and in the case of a steel pipe, the external thread formed on the outer surface of the connected member is formed by cutting an external thread on the outer surface of the steel pipe and a screw joint rebar. In the case of (1), the male screw provided on the outer surface is directly used, and the female screw provided on the inner surface of the first connection cylinder and the second connection cylinder is formed so as to be screwed with the male screw of the thread-bar rebar.
[0011]
According to a second aspect of the present invention, there are provided two inner connection cylinders which are externally screwed into each of the connected members each having an external thread formed on the outer surface, and an outer connection cylinder which externally fits over both the inner connection cylinders. A male screw is formed on the outer surface of the connection tube, and a female screw is formed on the inner surface of the outer connection tube to be screwed with the male screw of both inner connection tubes.
[0012]
The connected member is a steel pipe or a threaded rebar, and the external thread formed on the outer surface of the connected member is a steel pipe. The male screw provided on the outer surface is directly used, and the female screw provided on the inner surface of both inner connecting cylinders is formed so as to be screwed with the male screw of the thread-bar rebar.
[0013]
According to the third aspect of the present invention, an enlarged diameter portion is provided at an end portion of the connected members to be connected to each other, a male screw is formed on an outer surface, and externally fitted to one of the connected members to form a retaining shape at the enlarged diameter portion. And a second connection tube fitted to the other connected member so as to prevent the first connection tube from falling off at the enlarged diameter portion, and the second connection tube externally fitted to the first connection tube. Of the first connection cylinder is formed with a female screw to be screwed to the male screw on the outer surface of the first connection cylinder.
[0014]
In the third aspect of the present invention, the member to be connected is a steel pipe, the enlarged diameter portion at the end is formed in a flange, and the outer diameter of the first connection cylinder and the inner diameter of the second connection cylinder are larger than those of the enlarged diameter portion. Also has a slightly larger diameter.
[0015]
According to a fourth aspect of the present invention, there is provided two inner connecting cylinders which are provided with enlarged diameter portions at ends of connected members which are to be connected to each other, and which are externally fitted to the respective connected members so as to be prevented from falling off at the enlarged diameter portions. And an outer connection cylinder that fits over both inner connection cylinders. An external thread is formed on the outer surface of the inner connection cylinder, and an internal thread is screwed on the inner surface of the outer connection cylinder. Is adopted.
[0016]
In the above invention, the member to be connected is a steel pipe, and the enlarged diameter portion at the end is formed by a flange, and the end is formed by bulging in an arc shape. The inner diameter of the outer connection cylinder is equal to or slightly larger than the diameter of the enlarged diameter portion.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
The threaded joint according to the first embodiment shown in FIG. 1 is a case where a member to be connected is a steel pipe, and external threads 2 are formed by cutting on end outer surfaces of steel pipes 1 and 1 to be connected to each other. A first connection tube 3 externally engaged with one of the steel pipes 1 and a second connection tube 4 externally engaged with the other steel pipe 1 are provided. A female screw 5 to be screwed with the male screw 2 is formed on the inner surface of the two connection cylinder 4.
[0019]
A male screw 6 is formed on the outer surface of the first connection tube 3, and a cylindrical extension 7 is provided on the second connection tube 4 so as to fit to the first connection tube 3. A female screw 8 that is screwed to the male screw 6 on the outer surface of the connection tube 3 is formed.
[0020]
The external threads 2 and 6 and the internal threads 5 and 8 are both formed as right-hand threads, and the external shape of the second connection cylinder 4 may be circular, but may be polygonal so that the rotation operation can be performed smoothly. In the first connection tube 3, a rotation operation nut portion 9 having a polygonal outer shape is provided at an end opposite to the side where the second connection tube 4 is screwed.
[0021]
The threaded joint according to the first embodiment is configured as described above. To connect the steel pipes 1 and 1, one steel pipe 1 is connected to the first connection cylinder 3 and the other steel pipe 1. The second connection tube 4 is screwed into each of the first connection tube 3 and the end of the first connection tube 3 is made to coincide with the end of one steel pipe 1. The second connecting cylinder 4 is screwed to a position inside the other steel pipe 1 so as to be fixed, and the second steel pipes 1 and 1 are brought into contact with each other in a state where the ends of the steel pipes 1 and 1 are in contact with each other. By rotating the connecting cylinder 4 clockwise, the cylindrical extension 7 is screwed into the first connection cylinder 3, and the step 10 formed at the base of the cylindrical extension 7 contacts the end face of the first connection cylinder 3. After the completion of the screwing, the first connection tube 3 is rotated leftward with respect to the one steel pipe 1 and the second connection tube 4, and the feed operation of the male screws 2, 6 and the female screws 5, 8 is performed. Give square of the steel pipe 1 the feed toward to the other steel pipe 1.
[0022]
At the time of the connection, the second connection cylinder 4 moves while rotating toward the first connection cylinder 3, so that the cylindrical extension 7 is screwed into the first connection cylinder 3 with the male screw 6 and the female screw 8. The first connecting cylinder 3 is turned leftward while the step 10 formed at the base of the cylindrical extension 7 inside the second connecting cylinder 4 is in contact with the end face of the first connecting cylinder 3. Then, by feeding one steel pipe 1 toward the other steel pipe 1, the two steel pipes 1 and 1 are connected in a compressed load state in which the ends of the two steel pipes 1 are pressed.
[0023]
Next, the threaded joint of the second embodiment shown in FIG. 2 is an example in which the connected member is a threaded bar, and the basic structure is the same as the threaded joint of the first embodiment. Therefore, the same portions are denoted by the same reference numerals, and description will be omitted.
[0024]
The screw joint reinforcing bar 1a has a known structure in which a right-handed male screw 11 is provided on the outer peripheral surface at a relatively large pitch. Each female screw 5 of the first connection cylinder 3 and the second connection cylinder 4 The threaded bar 1a is formed so as to be screwed with the male thread 11 of the threaded bar 1a.
[0025]
In order to connect the threaded bar 1a with the threaded joint according to the second embodiment, as shown in FIG. 2A, one threaded bar 1a is connected to the first connection cylinder 3 and the other threaded bar 1a. The second connection cylinders 4 are screwed into each other, the end of the first connection cylinder 3 is matched with the end of one screw joint reinforcement 1a, and the above-mentioned state of the one screw joint reinforcement 1a and the first connection cylinder 3 is changed. The second connection tube 4 is fixed, and the second connection tube 4 is screwed up to an inner position with respect to the other threaded bar 1a, and the ends of the two threaded bars 1a are brought into contact with each other. 4 is rotated clockwise to screw the cylindrical extension 7 into the first connection cylinder 3, and the stepped portion 10 formed at the root of the cylindrical extension 7 comes into contact with the end face of the first connection cylinder 3. Thereafter, the first connection tube 3 is rotated leftward with respect to one of the screw joint reinforcing bars 1a and the second connection tube 4, and the male screws 6, 11 and the female screws 5, 8 are fed. It gives the feeding of the one threaded section rebar 1a toward the other threaded section reinforcing bars 1a by the action.
[0026]
At the time of the above connection, the first connection tube 3 is turned counterclockwise in a state where the step 10 formed at the root portion of the cylindrical extension 7 inside the second connection tube 4 is in contact with the end surface of the first connection tube 3. By moving one screw joint reinforcing bar 1a toward the other screw joint reinforcing bar 1a, the two screw joint reinforcing bars 1a and 1a are connected in a compression load state in which their ends are crimped to each other. .
[0027]
The threaded joint according to the third embodiment shown in FIG. 3 is a case where the connected members are steel pipes, and external threads 2 are formed by cutting on the outer surfaces of the ends of the steel pipes 1 and 1 to be connected to each other. The inner connection pipes 13 and 13 are externally fitted to the steel pipes 1 and 1 with the female screw 12 respectively, and the outer connection pipes 14 are externally fitted over the inner connection pipes 13 and 13. A male screw 15 is formed on the outer surface of each of the inner connection tubes 13, 13, and a female screw 16 is formed on the inner surface of the outer connection tube 14 to be screwed with the male screw 15 of each of the inner connection tubes 13, 13.
[0028]
The outer shape of the outer connection tube 14 may be circular, but is preferably formed in a polygonal shape so that the rotation operation can be performed smoothly. In addition, in any one of the inner connection tubes 13, the outer connection tube 14 protrudes from the outer connection tube 14. A rotation operation nut 17 having a polygonal outer shape is provided at the end on the side of the rotation.
[0029]
To connect the steel pipe 1 with the screw joint of the third embodiment, as shown in FIG. The ends of the inner connecting tube 13 are made to coincide with the ends of the pipes 1 and 1, and the outer connecting tube 14 is inserted into one of the inner connecting tubes 13 until the end of the inner connecting tube 13 is immersed from the end of the inner connecting tube 13. With the steel pipes 1 and 1 and the ends of both inner connecting tubes 13 and 13 being in contact with each other, the outer connecting tube 14 is rotated to screw the male screw 15 and the female screw 16 together. The inner connecting cylinders 13 are moved to a position where they are fitted almost uniformly over the inner connecting cylinders 13.
[0030]
At the time of the above connection, the outer connecting cylinder 14 is fitted over the inner connecting cylinders 13 and 13 by rotating and moving, and the ends of both the steel pipes 1 and 1 and the inner connecting cylinders 13 and 13 are connected. When one of the inner connection tubes 13 and 13 is rotated counterclockwise with respect to the fixed steel pipe 1 and the outer connection tube 14 in a state where they are in contact with each other, the male screws 2 and 15 and the female screws 12 and 16 are rotated. The feed is given to one steel pipe 1 toward the other steel pipe 1 by the action of the above, and the two steel pipes 1 and 1 are connected to each other in a compressed load state in which the ends of the steel pipes 1 and 1 are pressed.
[0031]
The threaded joint according to the fourth embodiment shown in FIG. 4 is an example in which the connected member is a threaded bar, and the basic structure is the same as the threaded joint according to the third embodiment. The same reference numerals are given to the parts, and the description is replaced.
[0032]
The screw joint reinforcing bar 1a has a structure in which male threads 11 are provided on the outer surface thereof at a relatively large pitch, and the internal threads 12 of the inner connection tubes 13, 13 are screwed into the male threads 11 of the screw joint reinforcing bar 1a. It is formed so that.
[0033]
In order to connect the threaded bar with the threaded joint of the fourth embodiment, as shown in FIG. 4 (A), the inner connection cylinders 13 and 13 are screwed to the two threaded bars 1a and 1a, respectively. The ends of the inner connection tubes 13 and 13 are made to coincide with the ends of the screw joint reinforcing bars 1a and 1a, and the outer connection tube 14 is inserted into one of the inner connection tubes 13 and the end thereof is immersed from the end of the inner connection tube 13. The outer connection tube 14 is rotated by rotating the outer connection tube 14 in a state in which the both threaded reinforcing bars 1a, 1a and the ends of the inner connection tubes 13, 13 are in contact with each other. The inner connection cylinders 13 are moved to a position where they are fitted almost uniformly over both inner connection cylinders 13 by screwing.
[0034]
The outer connecting cylinder 14 is moved while rotating, and the external connecting cylinder 14 is screwed into the other inner connecting cylinder 13 with the male screw 15 and the female screw 16 as shown in FIG. , 13 are fitted approximately evenly, and then one of the inner connection tubes 13, 13 is turned counterclockwise with respect to the fixed screw joint reinforcing bar 1 a and the outer connection tube 14. , 15 and the female screws 12, 16, one of the threaded reinforcing bars 1a is fed toward the other threaded reinforcing bar 1a, and the two threaded reinforcing bars 1a, 1a are compressed in a state where their ends are crimped. Will be connected.
[0035]
The threaded joint according to the fifth embodiment shown in FIG. 5 is a case where the connected members are steel pipes, and a flange 18 which is an enlarged diameter portion is provided at an end of the steel pipes 1 and 1 to be connected to each other. A first connecting cylinder 20 having an outer surface formed by external fitting on one of the steel pipes 1 and having a flange 18 so as to be prevented from coming off in the axial direction and having a male screw 19 on the outer surface; 1 has a second connection tube 21 fitted to the first connection tube 20 so as to prevent the first connection tube 20 from falling off, and has a first connection tube 20 on the inner surface of the second connection tube 21. A female screw 22 screwed to the male screw 19 is formed.
[0036]
The outer diameter of the first connection cylinder 20 and the inner diameter of the second connection cylinder 21 are slightly larger than the flange 18 and one end of the second connection cylinder 21 is smaller in diameter than the flange 18 and made of steel. It has a flange wall 23 having an inner diameter that fits externally to the pipe 1, and is fitted externally to the other steel pipe 1 so that the flange 18 forms an axial stopper.
[0037]
To connect a steel pipe with the threaded joint of the fifth embodiment, as shown in FIG. 5, a first connection pipe 20 is connected to one steel pipe 1 and a second connection pipe is connected to the other steel pipe 1. 21 are fitted and inserted before the flange 18 is attached or machined, and the first connecting cylinder 20 is connected to the flange 18 of one steel pipe 1 in a state where the flanges 18 of both steel pipes 1 and 1 are in contact with each other. When the second connection tube 21 is screwed into the first connection tube 20, the flanges 18 of both steel pipes 1, 1 are formed by the end of the first connection tube 20 and the flange wall 23 of the second connection tube 21. The two steel pipes 1, 1 are sandwiched, and are connected with their ends pressed against each other.
[0038]
In the case shown in the drawing, an example is shown in which a packing material 24 is interposed between the facing surfaces of the flanges 18 and 18 of the steel pipes 1 and 1 to improve the sealing performance of the connection portion between the steel pipes 1 and 1. .
[0039]
The screw joint of the sixth embodiment shown in FIG. 6 is a case where the connected member is a steel pipe, but is structurally the same as the screw joint of the third embodiment described above. The description is given with the same reference numerals as in the third embodiment.
[0040]
In FIG. 6, a flange 18 which is an enlarged diameter portion is provided at an end of the steel pipes 1 to be connected to each other, and two inner connection cylinders 13 and 13 fitted to each of the steel pipes 1 are provided. An outer connection cylinder 14 is fitted over the connection cylinders 13, 13. The inner connection cylinders 13, 13 have no screws on the inner surface and form external threads 15 on the outer surfaces. A female screw 16 that is screwed to the male screw 15 of each of the inner connection tubes 13 and 13 is formed.
[0041]
The outer diameter of the inner connecting cylinders 13 and the inner diameter of the outer connecting cylinder 14 are slightly larger than the diameter of the flange 18, and the outer shape of the outer connecting cylinder 14 may be circular, but the rotation operation can be performed smoothly. Thus, it is preferable to form a polygon, and in one of the inner connection tubes 13, a rotation operation nut portion 17 having a polygonal outer shape is provided at the end protruding from the outer connection tube 14. It is.
[0042]
In order to connect the steel pipe 1 with the threaded joint according to the sixth embodiment, as shown in FIG. And the outer connection tube 14 is screwed into one of the inner connection tubes 13 until the end of the outer connection tube 14 is immersed from the end of the inner connection tube 13. Are brought into contact with each other, and the outer connection tube 14 is rotated in a state where the inner connection tubes 13 and 13 are positioned on the flange 18 side of the respective steel pipes 1 and 1, and the feeding operation of the male screw 15 and the female screw 16 is performed. It is moved to the other inner connection cylinder 13 side.
[0043]
The outer connection cylinder 14 is fitted to the other inner connection cylinder 13 by screwing the male screw 15 and the female screw 16 to the other inner connection cylinder 13 by rotating and moving. After fitting approximately equally, either one of the inner connection tubes 13 and 13 is screwed into the outer connection tube 14 to be fixed. The two steel pipes 1, 1 are sandwiched, and are connected in a compressed load state in which the ends of the steel pipes 1, 1 are pressed.
[0044]
In the case shown in the figure, a packing material 24 is interposed between the opposing surfaces of the two flanges 18 to improve the sealing performance of the connection portion between the two steel pipes 1.
[0045]
The threaded joint of the seventh embodiment shown in FIG. 7 is a modification of the sixth embodiment, and the same parts as those of the sixth embodiment are denoted by the same reference numerals and description thereof will be omitted.
[0046]
The seventh embodiment is different from the seventh embodiment in that the enlarged diameter portion provided at the ends of the steel pipes 1 and 1 to be connected to each other is an arc-shaped enlarged diameter portion 18a in which the peripheral wall of the steel pipe 1 bulges outward. The ends of the inner connecting cylinders 13, 13 facing the arc-shaped enlarged portion 18a are perpendicular to the axis in the drawing, and the sealing material is provided between the end-facing surfaces of the arc-shaped enlarged portion 18a. 24, and the connection of the steel pipe 1 by the threaded joint of the seventh embodiment can be performed by the same procedure and operation as in the above-described sixth embodiment.
[0047]
In the threaded joints of the fifth to seventh embodiments described above, since the flange 18 and the arc-shaped enlarged portion 18a are provided at the end of the steel pipe 1, the first connection cylinder 20 and the The two-connection tube 21 and the inner connection tube 13 need to be fitted into the steel pipe 1 before processing the flange 18 and the arc-shaped enlarged-diameter portion 18a.
[0048]
Therefore, FIGS. 8 and 9 show that the first connection tube 20, the second connection tube 21, and the inner connection tube 13 can be connected by so-called retrofitting after providing the flange 18 and the arc-shaped enlarged portion 18a. 9 shows threaded joints of the eighth and ninth embodiments.
[0049]
The eighth embodiment shown in FIG. 8 structurally corresponds to the fifth embodiment, and a pair of divided retaining members 31 used in combination with the first connection cylinder 20 and the second connection cylinder 21 are prepared. ing.
[0050]
The first connection cylinder 20 provided with the external thread 19 on the outer diameter is formed so that the inner diameter can pass through the flange 18, and the second connection cylinder 21 is externally screwed to the first connection cylinder 20 by the female screw 22. An inner small-diameter portion 21b is provided at one end of the combined cylindrical portion 21a, and the inner small-diameter portion 21b has an inner diameter capable of passing through the flange 18, and a step portion 21c is formed at the inner end.
[0051]
The split retaining member 31 is formed in a two-part cylindrical shape whose inner diameter is fitted to the steel pipe 1 and whose outer diameter is fitted to the first connection tube 20 or the inner small-diameter portion 21b. A flange portion 32 having an outer diameter that fits within the tube portion 21a of the two connection tube 21 is provided.
[0052]
In order to connect the steel pipe 1 with the threaded joint according to the eighth embodiment, a flange 18 is formed on each of the steel pipes 1, 1, and then the first connection pipe 20 is connected to one of the steel pipes 1. The second connecting cylinder 21 is fitted into the other steel pipe 1 and the end flanges 18 of the two steel pipes 1 and 1 are brought into contact with each other in this state. The flange 32 is externally fitted so as to abut against the flange 18, the first connection cylinder 20 is moved, and the one split retaining member 31 is externally fitted so that its end abuts on the flange 32, and the second connection The cylinder 21 is moved so that the inner small-diameter portion 21b is externally fitted so that the flange portion 32 of the other divided retaining member 31 comes into contact with the step portion 21c, and the cylinder portion 21a of the second connection cylinder 21 is fitted to the first connection cylinder 20. Screw together.
[0053]
When the first connection tube 20 is further screwed in after the second connection tube 21 is screwed, the two steel pipes 1 and 1 are pressed by the flanges 18 and 18 from both sides, and the two steel pipes 1 and 1 The ends are connected in a compressed load state in which the ends are crimped.
[0054]
The ninth embodiment shown in FIG. 9 structurally corresponds to the sixth and seventh embodiments, and has two inner connection tubes 13, 13 and an outer connection tube fitted over both inner connection tubes 13, 13. A pair of split retaining members 31 used in combination with 14 are prepared.
[0055]
The inner connection tube 13 provided with an external thread on the outer diameter is formed so that the inner diameter thereof can pass through the flange 18, and the outer connection tube 14 is externally screwed to the inner connection tubes 13, 13 by the female screw 16. It is formed as follows.
[0056]
The split retaining member 31 is formed in a two-part tubular shape whose inner diameter is fitted to the steel pipe 1 and whose outer diameter is fitted to the inner connecting tube 13, and has one end inside the outer connecting tube 14. A flange 32 having an outer diameter that can be accommodated is provided.
[0057]
In order to connect the steel pipe 1 with the screw joint of the ninth embodiment, after forming the flanges 18 and 18 on the both steel pipes 1 and 1, respectively, the inner connecting pipe is connected to the both steel pipes 1 and 1. 13 and the outer connection tube 14 is externally screwed into one of the inner connection tubes 13. In this state, the end flanges 18 of the both steel pipes 1 and 1 are brought into contact with each other, and the two steel pipes 1 and 1 are connected. The split retaining member 31 is externally fitted so that the flange 32 abuts against the flange 18, and the inner connecting tube 13 is moved so that the end of the split retaining member 31 abuts the flange 32. Then, in this state, the outer connection tube 14 is rotated and externally fitted to the other inner connection tube 13.
[0058]
After the outer connection cylinder 14 is screwed over both inner connection cylinders 13 and 13, when any one of the inner connection cylinders 13 is further screwed, the flanges 18 of both steel pipes 1 and 1 are connected to each other by the two inner connection cylinders 13 and 13. 13, both steel pipes 1 and 1 are connected in a compressed load state in which the ends are crimped.
[0059]
【The invention's effect】
As described above, according to the present invention, since the above-described configuration is employed, in connecting steel pipes and rebars, connection can be performed without rotating the steel pipes and rebars, and the connection depends on work conditions at the site. The connection work can be performed efficiently and easily without any trouble, and the connection of the compressed load state where the ends of the steel pipe and the rebar are directly abutted can be achieved, resulting in a connection with excellent strength against axial compression and tensile load. Will be done.
[0060]
Also, when connecting the connected member using the enlarged diameter portion provided at the end portion, it is not necessary to drill holes for bolting the enlarged diameter portion, and the outer diameter of the enlarged diameter portion is reduced, Workability can be improved and material costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a connection state of a threaded joint according to a first embodiment; FIG. 2 (A) is a longitudinal sectional view showing a state before connection showing a second embodiment of the threaded joint; FIG. 3B is a longitudinal sectional view of the same connection state. FIG. 3 is a longitudinal sectional view of a connection state showing a third embodiment of the threaded joint. FIG. 4A is a fourth embodiment of the threaded joint. FIG. 5B is a longitudinal sectional view of a state before connection, FIG. 5B is a longitudinal sectional view of the same state of connection, FIG. 5 is a longitudinal sectional view of a state of connection showing a fifth embodiment of the threaded joint, FIG. FIG. 7 is a longitudinal sectional view of a connection state showing an embodiment of the present invention. FIG. 7 is a longitudinal sectional view of a connection state showing a seventh embodiment of the threaded joint. FIG. 8 is a connected state showing an eighth embodiment of the threaded joint. FIG. 9 is a longitudinal sectional view of a connection state showing a ninth embodiment of a threaded joint.
DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Male screw 3 First connection cylinder 4 Second connection cylinder 5 Female screw 6 Male screw 7 Extension 8 Female screw 9 Nut part 10 for rotation operation Step 11 Male screw 12 Female screw 13 Inner connection cylinder 14 Outer connection cylinder 15 Male screw 16 Female screw 17 Nut part for rotation operation 18 Flange 19 Male screw 20 First connection cylinder 21 Second connection cylinder 22 Female screw 23 Flange wall 24 Packing material 31 Split retaining member 32 Flange
