JP3949034B2

JP3949034B2 - Columnar joint structure

Info

Publication number: JP3949034B2
Application number: JP2002245355A
Authority: JP
Inventors: 隆森; 明男相和; 扶樹岡; 優任高木
Original assignee: Kubota Corp; Nippon Steel Corp
Current assignee: Kubota Corp; Nippon Steel Corp
Priority date: 2002-08-26
Filing date: 2002-08-26
Publication date: 2007-07-25
Anticipated expiration: 2022-08-26
Also published as: JP2004084251A

Description

【０００１】
【発明の属する技術分野】
本発明は、軸心方向で互いに隣接する一方の柱状体に軸状継手部が設けられ、他方の柱状体に前記軸状継手部に外嵌自在な筒状継手部が設けられて、その筒状継手部を前記軸状継手部に外嵌し、かつ、両継手部間に設けられた接合機構により両継手部を接合することによって、両柱状体が、ほぼ同一軸心上に位置して互いに抜き差し不能に接合されている柱状体の接合構造に関する。
【０００２】
【従来の技術】
このような接合構造は、杭または矢板として地中に建て込まれる鋼管（柱状体の一例）と、その鋼管を地中に建て込む際に使用する建て込み用治具（柱状体の一例）との間での接合、あるいは、地中に建て込まれる鋼管どうしの接合などに採用されるもので、従来、図１４に示すような構造が多用されていた。
すなわち、鋼管１と建て込み用治具２の場合であれば、鋼管１の端部に取り付けた軸状継手部７の外側全周にわたって軸側キー溝３１を設け、軸状継手部７に外嵌自在な筒状継手部９を建て込み用治具２の端部に取り付け、その筒状継手部９の内周に複数の筒側キー溝３２を所定間隔置きに設けるとともに、各筒側キー溝３２内にリングキー３３を挿入し、筒状継手部９のねじ孔３４に螺合したセットボルト３５の先端に逆ねじを設けて、その逆ねじをリングキー３３に設けたねじ孔３６に螺合した構造であった。
そして、軸状継手部７に筒状継手部９を外嵌した状態で、筒状継手部９の外側からセットボルト３５を回転操作することにより、リングキー３３を内方へ押し込んで筒側キー溝３２と軸側キー溝３１との間に跨るように配置して、鋼管１と建て込み用軸２とをほぼ同一の軸心上に位置させて互いに抜き差し不能に接合するものであった。
【０００３】
【発明が解決しようとする課題】
上述した従来構造によれば、リングキー３３による接合は、筒状継手部９の外側からセットボルト３５を回転操作して行うのであるが、セットボルト３５の介在によって、リングキー３３が所定の位置にまで確実に嵌入されたか否かの確認がむずかしいという問題点があった。
さらに、鋼管１と建て込み用治具２の場合であれば、建て込み用治具２については何度も繰り返して使用するため、リングキー３３を所定の位置にまで押し込んだり引き抜いたりするためのセットボルト３５やねじ孔３４，３６などに負担がかかり、セットボルト３５やねじ孔３４，３６のねじが潰れて回転操作不能になる可能性があり、特に、鋼管１を地中に建て込む際、鋼管１内にセメントミルクなどがあると、セメントミルクが溢れてねじ孔３４，３６内に侵入したりセットボルト３５に付着する虞があって回転操作不能になる可能性が一層高かった。
【０００４】
本発明は、このような従来の問題点に着目したもので、その目的は、両柱状体間での接合操作を確実に行うことができ、たとえ鋼管と建て込み用治具の場合であっても、その建て込み用治具を何度も支障なく使用することのできる柱状体の接合構造を提供することである。
【０００５】
【課題を解決するための手段】
請求項１の発明の特徴構成は、図１を参照して図１１〜図１３に例示するごとく、軸心Ｌ方向で互いに隣接する一方の柱状体１に軸状継手部７が設けられ、他方の柱状体２に前記軸状継手部７に外嵌自在な筒状継手部９が設けられて、その筒状継手部９を前記軸状継手部７に外嵌し、かつ、両継手部７，９間に設けられた接合機構２３により両継手部７，９を接合することによって、両柱状体１，２が、ほぼ同一軸心Ｌ上に位置して互いに抜き差し不能に接合されている柱状体の接合構造であって、前記接合機構２３が、前記軸状継手部７の外周および前記筒状継手部９の内周に設けられたキー溝８，２８と、その軸状継手部７と筒状継手部９のキー溝８，２８にわたって嵌入自在なキー１６を備えた接合部材１４で構成され、その接合部材１４の前記キー１６が、前記筒状継手部９の外側からその筒状継手部９に設けられたスリット１１を挿通して前記キー溝８，２８に嵌入した状態で、前記接合部材１４が筒状継手部９に対して固定解除可能に固定されて、前記筒状継手部９から抜け止めされているところにある。
【０００６】
請求項１の発明の特徴構成によれば、軸状継手部とその軸状継手部に外嵌自在な筒状継手部との間に設けられた接合機構が、軸状継手部の外周および筒状継手部の内周に設けられたキー溝と、その軸状継手部と筒状継手部のキー溝にわたって嵌入自在なキーを備えた接合部材で構成されていて、接合部材のキーが、筒状継手部の外側からその筒状継手部に設けられたスリットを挿通して前記キー溝に嵌入されているので、キー溝へのキーの嵌入操作を筒状継手部の外側から行うことができ、かつ、その嵌入操作は、キー自体により直接的に、かつ、そのキーを筒状継手部のスリットに挿通して行うことになり、したがって、接合部材のキーが軸状継手部と筒状継手部のキー溝に嵌入したか否かの確認も比較的容易で、しかも、その接合部材が、筒状継手部に対して固定解除可能に固定されて、筒状継手部から抜け止めされているので、軸状継手部を有する柱状体と筒状継手部を有する柱状体との接合を確実に維持して両柱状体間での抜き差しを確実に防止することができる。
さらに、両柱状体が、例えば、地中に建て込まれる鋼管とその建て込みに使用する建て込み用治具のように、接合と接合解除とを何度も繰り返すような場合であっても、上述した従来構造のように、接合や接合解除のためにボルトやねじ孔を使用することがないので、比較的長年月にわたって何度も支障なく使用することができる。
【０００７】
請求項２の発明の特徴構成は、図１１〜図１３に例示するごとく、前記接合部材１４が、前記筒状継手部９の外周に設けられた凹入部１０と前記スリット１１に嵌入する嵌入部１５を備え、その嵌入部１５が、前記筒状継手部９の凹入部１０とスリット１１に嵌入した状態で、前記筒状継手部９に螺合するボルト１２によって筒状継手部９に対して固定解除可能に固定されているところにあり、請求項３の発明の特徴構成は、図１１〜図１３に例示するごとく、前記キー１６が頭部１６ｃを有するキーであり、前記嵌入部１５が前記筒状継手部９のスリット１１と凹入部１０に嵌入した状態で、その嵌入部１５に設けられた切欠き１５ｂに前記キー１６の頭部１６ｃが嵌合して抜け止めされているところにある。
【０００８】
請求項２の発明の特徴構成によれば、接合部材が、筒状継手部の外周に設けられた凹入部とスリットに嵌入する嵌入部を備え、その嵌入部が、筒状継手部の凹入部とスリットに嵌入した状態で、筒状継手部に螺合するボルトによって筒状継手部に固定解除可能に固定されるので、軸状継手部を有する柱状体と筒状継手部を有する柱状体との接合がより一層確実となる。
請求項３の発明の特徴構成によれば、前記キーが頭部を有するキーで、嵌入部が筒状継手部のスリットと凹入部に嵌入した状態で、その嵌入部に設けられた切欠きにキーの頭部が嵌合して抜け止めされるので、キーの抜け止めが確実となる。
【０００９】
請求項４の発明の特徴構成は、図１〜図６に例示するごとく、軸心Ｌ方向で互いに隣接する一方の柱状体１に軸状継手部７が設けられ、他方の柱状体２に前記軸状継手部７に外嵌自在な筒状継手部９が設けられて、その筒状継手部９を前記軸状継手部７に外嵌し、かつ、両継手部７，９間に設けられた接合機構２３により両継手部７，９を接合することによって、両柱状体１，２が、ほぼ同一軸心Ｌ上に位置して互いに抜き差し不能に接合されている柱状体の接合構造であって、前記接合機構２３が、前記軸状継手部７の外周に設けられたキー溝８と、そのキー溝８に嵌入自在なキー１６を一体的に備えた接合部材１４で構成され、その接合部材１４の前記キー１６が、前記筒状継手部９の外側からその筒状継手部９に設けられたスリット１１を挿通して前記キー溝８に嵌入した状態で、前記接合部材１４が筒状継手部９に螺合するボルト１２により筒状継手部９に対して固定解除可能に固定されて、前記筒状継手部９から抜け止めされているところにある。
【００１０】
請求項４の発明の特徴構成によれば、軸状継手部とその軸状継手部に外嵌自在な筒状継手部との間に設けられた接合機構が、軸状継手部の外周に設けられたキー溝と、そのキー溝に嵌入自在なキーを一体的に備えた接合部材で構成されていて、接合部材のキーが、筒状継手部の外側からその筒状継手部に設けられたスリットを挿通して前記キー溝に嵌入されているので、キー溝へのキーの嵌入操作を筒状継手部の外側から行うことができ、かつ、その嵌入操作は、キーを一体的に備えた接合部材により直接的に、かつ、そのキーを筒状継手部のスリットに挿通して行うことになり、したがって、接合部材のキーが軸状継手部側のキー溝に嵌入したか否かの確認も比較的容易で、しかも、その接合部材が筒状継手部に螺合するボルトにより抜け止めされているので、軸状継手部を有する柱状体と筒状継手部を有する柱状体との接合を確実に維持して両柱状体間での抜き差しを確実に防止することができる。
【００１１】
請求項５の発明の特徴構成は、図１〜図６に例示するごとく、前記接合部材１４が、前記筒状継手部９の外周に設けられた凹入部１０に嵌入する嵌入部１５とその嵌入部１５に一体的に突設された前記キー１６で構成され、前記嵌入部１５が、前記筒状継手部９の凹入部１０に嵌入した状態で筒状継手部９に対して固定解除可能に固定されているところにある。
【００１２】
請求項５の発明の特徴構成によれば、接合部材が、筒状継手部の外周に設けられた凹入部に嵌入する嵌入部とその嵌入部に一体的に突設されたキーで構成され、嵌入部が、筒状継手部の凹入部に嵌入した状態で筒状継手部に対して固定解除可能に固定されるので、軸状継手部を有する柱状体と筒状継手部を有する柱状体との接合がより一層確実となる。
【００１５】
なお、上述のように、図面との対照を便利にするために符号を記したが、該記入により本発明は添付図面の構成に限定されるものではない。
【００１６】
【発明の実施の形態】
本発明による柱状体の接合構造につき、その実施の形態を図面に基づいて説明する。
図１および図２は、第１の実施形態による柱状体の接合構造を示し、例えば、杭または矢板として地中に建て込まれる柱状体の一例である円形の鋼管１と、その鋼管１を地中に建て込む際に使用する柱状体の一例である円形の建て込み用治具２とをほぼ同一の軸心Ｌ上に位置させて互いに抜き差し不能に接合するためのものである。
そのため、鋼管１の上端には、軸状継手３が溶接により接続され、建て込み用治具２の下端には、軸状継手３に外嵌自在な筒状継手４が溶接により接続されていて、鋼管１の外周には、吊り下げ用の孔５ａを有する吊り下げ用金具５が一対突設され、建て込み用治具２の外周には、図外の杭施工機からの回転力を受ける回転用金具６が一対突設されて、各回転用金具６にも吊り下げ用の孔６ａが設けられている。
【００１７】
前記軸状継手３は、鋳造や鍛造により、あるいは、鋼管を機械加工することにより形成されていて、その下方部は鋼管１とほぼ同じ外径を有する円筒状に構成され、その上方部は鋼管１の外径よりも径の小さな円筒状の軸状継手部７に構成され、その軸状継手部７の外周には、図２に詳細に示すように、断面形状が矩形のキー溝８が、その全周にわたって連続的に設けられている。
前記筒状継手４も、鋳造や鍛造により、あるいは、鋼管を機械加工することにより形成され、その下端部は前記軸状継手部７に外嵌する筒状継手部９に構成されて、その筒状継手部９の外周には、例えば、合計４つの凹入部１０が、外周方向に等間隔に設けられている。各凹入部１０の上下方向中央部には、前記キー溝８とほぼ同じ上下幅を有するスリット１１が、凹入部１０に連通して凹入部１０の横幅方向の全長にわたって設けられ、スリット１１の上下には、ボルト１２が螺合するねじ孔１３が２つずつ設けられている。
【００１８】
筒状継手部９の各凹入部１０には、接合部材１４が嵌入自在に設けられ、各接合部材１４は、凹入部１０に嵌入する嵌入部１５と、その嵌入部１５の内面に一体的に突設されたキー１６により構成され、筒状継手部９を軸状継手部７に外嵌した状態で、接合部材１４の嵌入部１５を凹入部１０に嵌入すると、嵌入部１５の内面に突設のキー１６が、スリット１１を挿通して軸状継手部７のキー溝８に嵌入するとともに、嵌入部１５の外側面が、筒状継手部９の外周面と面一となって、筒状継手部９の外周面から突出しないように構成されている。
そして、各接合部材１４の嵌入部１５には、前記ボルト１２が貫通する座ぐり付きの貫通孔１７がキー１６の上下に２つずつ設けられ、かつ、各嵌入部１５の内面における上下の貫通孔１７とキー１６との間には、ゴムや合成樹脂からなるシール材１８が取り付けられていて、図２の（ロ）に示すように、筒状継手部９と接合部材１４との間に挟持されるように構成されている。
【００１９】
さらに、筒状継手４における筒状継手部９の外周には、各凹入部１０の間に位置する状態で合計４つの回り止め用の筒側凹入部１９が設けられ、軸状継手３の下方円筒部の外周にも、各筒側凹入部１９に対応して、合計４つの回り止め用の軸側凹入部２０が設けられている。
そして、筒状継手４側の筒側凹入部１９と軸状継手３側の軸側凹入部２０に跨って回り止めキー２１を嵌入して、ボルト２２などで固定することにより、筒状継手４と軸状継手３との相対回転が阻止されて、杭施工機からの回転力が、筒状継手４を介して軸状継手３側に伝達されるように構成されている。
【００２０】
つぎに、鋼管１と建て込み用治具２とを互いに接合する手順について説明すると、図外のクレーンなどを使用して、例えば、建て込み用治具２を吊り下げ保持しながら、建て込み用治具２側の筒状継手部９を鋼管１側の軸状継手部７に外嵌し、回り止め用の筒側凹入部１９と軸側凹入部２０とが互いに対向するように位置合わせを行う。
この嵌合状態において、軸状継手部７側のキー溝８と筒状継手部９側の各スリット１１とが互いに対向するように設定されているので、接合部材１４のキー１６をスリット１１に挿入するとともに、接合部材１４の嵌入部１５を凹入部１０に嵌入すると、キー１６がスリット１１を挿通してキー溝８に嵌入される。
つまり、軸状継手部７側のキー溝８と、そのキー溝８に嵌入自在なキー１６を一体的に備えた接合部材１４により接合機構２３が構成されていて、その接合機構２３によって、鋼管１と建て込み用治具２とが、ほぼ同一の軸心Ｌ上に位置して互いに抜き差し不能に接合される。
【００２１】
その後、各嵌入部１５の貫通孔１７にボルト１２をそれぞれ挿通して、筒状継手部９側のねじ孔１３に螺合することにより、各接合部材１４を筒状継手部９側に固定する。
さらに、互いに対向している筒側凹入部１９と軸側凹入部２０に跨るように回り止めキー２１を嵌入しボルト２２により固定して、筒状継手部９と軸状継手部７との相対回転、換言すると、建て込み用治具２と鋼管１との相対回転を阻止して、両者の接合作業を完了する。
その後、鋼管１の吊り下げ用金具５を使用して、クレーンなどで鋼管１と建て込み用治具２を吊り下げて所定の位置に保持し、図外の杭施工機により鋼管１を回転させながら地中に建て込むのであり、必要な場合には、同じ作業を繰り返して、複数本の鋼管１を互いに接続しながら順次建て込むのである。
【００２２】
つぎに、第２〜第６の実施形態について説明するが、重複説明を避けるため、先の実施形態で説明した構成や同じ作用を有する構成については、同じ符号を付すことでその説明を省略し、主として先の実施形態と異なる構成についてのみ説明する。
【００２３】
図３および図４は、第２の実施形態による柱状体の接合構造を示し、凹入部１０の横幅方向の中間部にのみスリット１１が設けられている。
すなわち、第１の実施形態では、接合部材１４のキー１６が挿通するスリット１１が、凹入部１０の横幅方向の全長にわたって設けられていたが、第２の実施形態では、凹入部１０の横幅方向の中間部にのみスリット１１が設けられ、それに対応して、接合部材１４のキー１６は、嵌入部１５の横幅方向の中間部にのみ突設されて、シール材１８は、キー１６の全周にわたって連続して取り付けられている。
【００２４】
図５および図６は、第３の実施形態による柱状体の接合構造を示し、筒状継手部９にスリット１１が直接設けられている。
すなわち、第１および第２の実施形態では、筒状継手部９の外周に凹入部１０を設け、その凹入部１０に連通する状態でスリット１１が設けられていたが、第３の実施形態では、筒状継手部９の外周に凹入部を設けることなく、スリット１１が直接設けられている。
この第３の実施形態では、比較的厚みの薄い接合部２４と、その接合部２４の内面から一体的に突設されたキー１６によって接合部材１４を構成するのが好ましく、接合部２４を筒状継手部９の外周に当て付け、筒状継手部９と接合部材１４との間にシール材１８を挟持してボルト１２により固定することになる。
【００２５】
図７および図８は、第４の実施形態による柱状体の接合構造を示し、これまでの実施形態と異なり、キー１６が、幅狭のキー部分１６ａと幅広のキー部分１６ｂを有する断面形状Ｔ字状のキーで構成され、さらに、そのキー１６と嵌合部材１５が別体に構成されている。つまり、図１〜図４に示した第１と第２の実施形態では、軸状継手部７側のキー溝８と筒状継手部９側のスリット１１が、ほぼ同じ上下幅を有する構成とされていたが、第４の実施形態では、スリット１１の上下幅が、キー溝８の上下幅よりも幅広に構成されて、その幅広のスリット１１と幅狭のキー溝８にわたって断面Ｔ字状のキー１６が嵌入自在に構成され、スリット１１の上下に跨って凹入部１０が設けられている。
そして、接合部材１４を構成するキー１６と嵌入部１５が別体に構成され、キー１６をキー溝８とスリット１１にわたって嵌入した状態で、上下の凹入部１０に跨る嵌入部１５をその外側に位置させ、嵌入部１５の座ぐり付き貫通孔１７にボルト１２を挿通して筒状継手部９側のねじ孔１３に螺合することにより、嵌入部１５の外側面が筒状継手部９の外周面と面一となって、接合部材１４を筒状継手部９に固定できるように構成され、さらに、幅広キー部分１６ｂの内面と軸状継手部７の外周面によりシール材１８を挟持するように構成されている。
【００２６】
図９および図１０は、第５の実施形態による柱状体の接合構造を示し、第４の実施形態と同様に、幅狭のキー部分１６ａと幅広のキー部分１６ｂを有する断面形状Ｔ字状のキー１６が、軸状継手部７側のキー溝８と筒状継手部９側のスリット１１にわたって嵌入自在に構成され、さらに、スリット１１の上方には、筒状継手部９を貫通する凹入部１０が設けられている。
接合部材１４を構成する嵌入部１５は、第４の実施形態と同様に、キー１６とは別体に構成されているのであるが、第４の実施形態とは異なり、嵌入部１５が、一対の脚部１５ａを有するコの字状に構成されている。
そして、キー１６をキー溝８とスリット１１にわたって嵌入した状態で、凹入部１０を挿通するコの字状の嵌入部１５をキー１６と軸状継手部７とにわたって跨るように位置させ、軸状継手部７の内側に位置する脚部１５ａに螺合するボルト２７の先端を軸状継手部７の内周面に押し付けることにより、嵌入部１５が凹入部１０内に入り込んだ状態で、接合部材１４を筒状継手部９と軸状継手部７とに固定できるように構成され、さらに、幅広キー部分１６ｂの内面と軸状継手部７の外周面によりシール材１８を挟持するように構成されている。
【００２７】
図１１〜図１３は、第６の実施形態による柱状体の接合構造を示し、第４および第５の実施形態と同様に、筒状継手部９を貫通する幅広のスリット１１が設けられ、そのスリット１１の上下に有底の凹入部１０が設けられるとともに、筒状継手部９の内周面には、軸状継手部７のキー溝８に対応するキー溝２８が、スリット１１の左右両側部に開口するように設けられている。
接合部材１４は、頭部１６ｃを有する左右一対のキー１６と、左右に切欠き１５ｂを有してスリット１１と凹入部１０に嵌入する嵌入部１５により構成されている。つまり、嵌入部１５の上下には、前記凹入部１０に嵌入する舌片１５ｃが一体的に突設され、スリット１１が凹入部１０の一部を兼用する状態で、舌片１５ｃを備えた十字状の嵌入部１５が、凹入部１０に嵌入自在に構成されている。
【００２８】
この第６の実施形態においては、筒状継手部９を軸状継手部７に外嵌した状態で、図１２の（イ）、（ロ）に模式的に示すように、スリット１１から左右一対のキー１６のうちのいずれか一方、例えば、右側のキー１６を挿通して軸状継手部７のキー溝８に挿入し、そのキー１６を右側に打ち込んで、図１３の（ロ）に示すように、軸状継手部７のキー溝８と筒状継手部９のキー溝２８とにわたって嵌入する。その後、同じように左側のキー１６を両キー溝８，２８に嵌入して、凹入部の一部を兼用するスリット１１と凹入部１０とにわたって嵌入部１５を嵌入する。
すると、嵌入部１５の切欠き１５ｂ内に左右のキー１６の頭部１６ｃが嵌合し、かつ、嵌入部１５の舌片１５ｃがスリット１１の上下に位置する凹入部１０に嵌入する。その後、嵌入部１５の舌片１５ｃに設けられた座ぐり付き貫通孔１７にボルト１２を挿通して筒状継手部９側のねじ孔１３に螺合することにより、図１３の（イ）に示すように、嵌入部１５の外側面が筒状継手部９の外周面と面一となって、嵌入部１５と左右一対のキー１６からなる接合部材１４を筒状継手部９に固定できるように構成されている。
この第６の実施形態によれば、軸状継手部７と筒状継手部９のキー溝８，２８と接合部材１４が接合機構２３として機能することになり、ひとつのスリット１１から２本のキー１６を嵌入することができるので、両キー溝８，２８に対して、スリット１１の横幅の２倍近い長さのキー１６を嵌入することが可能となる。
【００２９】
なお、これまでの実施形態では、互いに抜き差し不能に接合する柱状体の例として、地中に建て込む鋼管１と建て込み用治具２を示したが、鋼管１どうしの接合にも適用することができる。
【図面の簡単な説明】
【図１】第１の実施形態による柱状体の接合構造を示す分解斜視図
【図２】第１の実施形態による接合構造の要部を示す断面図
【図３】第２の実施形態による接合構造の要部を示す分解斜視図
【図４】第２の実施形態による接合構造の要部を示す断面図
【図５】第３の実施形態による接合構造の要部を示す分解斜視図
【図６】第３の実施形態による接合構造の要部を示す断面図
【図７】第４の実施形態による接合構造の要部を示す分解斜視図
【図８】第４の実施形態による接合構造の要部を示す断面図
【図９】第５の実施形態による接合構造の要部を示す分解斜視図
【図１０】第５の実施形態による接合構造の要部を示す断面図
【図１１】第６の実施形態による接合構造の要部を示す分解斜視図
【図１２】第６の実施形態による接合構造の接合手順を示す模式図
【図１３】第６の実施形態による接合構造の要部を示す断面図
【図１４】従来の接合構造の要部を示す断面図
【符号の説明】
１，２柱状体
７軸状継手部
８軸状継手部外周のキー溝
９筒状継手部
１０凹入部
１１スリット
１２ボルト
１４接合部材
１５嵌入部
１５ｂ嵌入部の切欠き
１６キー
１６ｃキーの頭部
１８シール材
２３接合機構
２８筒状継手部内周のキー溝
Ｌ軸心[0001]
BACKGROUND OF THE INVENTION
In the present invention, one columnar body adjacent to each other in the axial direction is provided with a shaft-like joint portion, and the other columnar body is provided with a cylindrical joint portion that can be fitted over the shaft-like joint portion. The two columnar bodies are positioned on substantially the same axial center by fitting the joints to the shaft-like joints and joining the joints by a joining mechanism provided between the joints. The present invention relates to a joining structure of columnar bodies that are joined together so as not to be inserted and removed.
[0002]
[Prior art]
Such a joint structure consists of a steel pipe (an example of a columnar body) built into the ground as a pile or a sheet pile, and an erection jig (an example of a columnar body) used when the steel pipe is built into the ground. The structure as shown in FIG. 14 has been widely used in the past.
That is, in the case of the steel pipe 1 and the erection jig 2, the shaft-side key groove 31 is provided over the entire outer periphery of the shaft-like joint portion 7 attached to the end of the steel pipe 1, and the shaft-like joint portion 7 is externally attached. A tubular joint portion 9 that can be fitted is attached to the end of the erection jig 2, and a plurality of tubular side key grooves 32 are provided at predetermined intervals on the inner periphery of the tubular joint portion 9. A ring key 33 is inserted into the groove 32, a reverse screw is provided at the tip of a set bolt 35 screwed into the screw hole 34 of the cylindrical joint portion 9, and the reverse screw is inserted into a screw hole 36 provided in the ring key 33. It was a screwed structure.
Then, in a state where the cylindrical joint portion 9 is fitted on the shaft-shaped joint portion 7, the ring key 33 is pushed inward by rotating the set bolt 35 from the outside of the cylindrical joint portion 9. It arrange | positions so that it may straddle between the groove | channel 32 and the axial key groove 31, and the steel pipe 1 and the erection axis | shaft 2 are located on the substantially the same shaft center, and are mutually joined so that it cannot be inserted or removed.
[0003]
[Problems to be solved by the invention]
According to the above-described conventional structure, the ring key 33 is joined by rotating the set bolt 35 from the outside of the cylindrical joint portion 9. The ring key 33 is moved to a predetermined position by the intervention of the set bolt 35. There was a problem that it was difficult to confirm whether or not it was securely inserted.
Further, in the case of the steel pipe 1 and the erection jig 2, the erection jig 2 is used repeatedly over and over, so that the ring key 33 is pushed into and pulled out to a predetermined position. There is a possibility that the set bolt 35 and the screw holes 34 and 36 are burdened, and the screws of the set bolt 35 and the screw holes 34 and 36 may be crushed and become unable to rotate. Especially, when the steel pipe 1 is built in the ground. When there is cement milk or the like in the steel pipe 1, there is a possibility that the cement milk overflows and enters the screw holes 34 and 36 or adheres to the set bolt 35, which makes rotation operation impossible.
[0004]
The present invention pays attention to such a conventional problem, and its purpose is to perform the joining operation between both columnar bodies reliably, even in the case of a steel pipe and a built-in jig. Furthermore, it is to provide a joining structure of columnar bodies that can be used many times without any trouble.
[0005]
[Means for Solving the Problems]
As illustrated in FIGS . 11 to 13 with reference to FIG. 1, the characteristic configuration of the first aspect of the invention is that the shaft-like joint portion 7 is provided in one columnar body 1 adjacent to each other in the axial center L direction, and the other The columnar body 2 is provided with a cylindrical joint portion 9 that can be fitted over the shaft-like joint portion 7, and the cylindrical joint portion 9 is fitted over the shaft-like joint portion 7. , 9 by joining the joint portions 7, 9 together, the columnar bodies 1, 2 are positioned substantially on the same axis L and are joined together so that they cannot be inserted and removed. A body joint structure, in which the joint mechanism 23 includes key grooves 8 and 28 provided on an outer periphery of the shaft-like joint portion 7 and an inner periphery of the tubular joint portion 9 , and the shaft-like joint portion 7 a cemented member 14 having a tubular fitting portion 9 of the keyway 8, fitted freely keys 16 over 28, the joint It said key 16 of 14, in a state in which by inserting the slit 11 provided from the outside to the tubular fitting portion 9 of the tubular fitting portion 9 fitted in the key groove 8, 28, the joining member 14 is cylindrical The cylindrical joint portion 9 is fixed to the tubular joint portion 9 so as to be unreleasable and is prevented from coming off from the cylindrical joint portion 9.
[0006]
According to the characteristic configuration of the first aspect of the present invention, the joining mechanism provided between the shaft-like joint portion and the cylindrical joint portion that can be fitted onto the shaft-like joint portion includes the outer periphery of the shaft-like joint portion and the cylinder. and the key groove provided on the inner periphery of the Jo joint, be constituted by a bonding member having a fitting closable key over the key groove of the shaft-shaped joint portion and the cylindrical fitting portion, the key of the joining members Since the slit is provided in the cylindrical joint portion from the outside of the cylindrical joint portion and is inserted into the key groove, the key is inserted into the key groove from the outside of the cylindrical joint portion. can be, and the fitting operation, more directly to the key itself, and will be done by inserting the key into the slit of the tubular joint portion, therefore, the key of the junction member is shaft-like coupling portion and confirms whether or not fitted into the key groove of the tubular joint also relatively easy, moreover, the joint material Is fixed releasably secured to the tubular fitting portion, because it is retained by the tubular coupling portion, securely bonding between the columnar body having a columnar body and the tubular joint portion having a shaft-like coupling portion It is possible to reliably prevent the insertion and removal between both columnar bodies.
Furthermore, even when both columnar bodies repeat joining and unbonding many times, such as a steel pipe built in the ground and an erection jig used for erection, Since the bolts and screw holes are not used for joining and unjoining as in the conventional structure described above, they can be used without any trouble over a relatively long period of time.
[0007]
The characteristic configuration of the invention of claim 2 is that, as illustrated in FIGS. 11 to 13, the joining member 14 is fitted into the recessed portion 10 provided on the outer periphery of the cylindrical joint portion 9 and the slit 11. 15 , with the fitting portion 15 being fitted into the concave fitting portion 10 and the slit 11 of the cylindrical joint portion 9, with respect to the cylindrical joint portion 9 by a bolt 12 screwed into the cylindrical joint portion 9. It is in the place which is fixed releasably secured, the characteristic configuration of the invention of claim 3, as illustrated in FIGS. 11 to 13, a key for the key 16 has a head portion 16c, the fitting portion 15 In a state where the slits 11 and the recessed portions 10 of the cylindrical joint portion 9 are fitted, the heads 16c of the keys 16 are fitted into the notches 15b provided in the fitted portions 15 and are prevented from being detached. is there.
[0008]
According to a feature configuration of the invention of claim 2, junction member is provided with a fitting portion to be fitted into the recess and the slit provided on the outer periphery of the tubular fitting portion, the fitting portion is concave cylindrical joint portion Since it is fixed to the cylindrical joint portion by a bolt screwed to the cylindrical joint portion while being fitted in the insertion portion and the slit, the columnar body having the axial joint portion and the columnar body having the cylindrical joint portion are fixed. Bonding with is even more reliable.
According to the characteristic configuration of the invention of claim 3, the key is a key having a head, and the insertion portion is inserted into the slit and the recess of the cylindrical joint portion, and the notch provided in the insertion portion is provided. Since the head of the key is fitted and retained, the key can be securely retained.
[0009]
As shown in FIGS. 1 to 6 , the characteristic configuration of the invention of claim 4 is that the columnar joints 7 are provided in one columnar body 1 adjacent to each other in the axial center L direction, and the other columnar body 2 has the above-mentioned configuration. A cylindrical joint portion 9 that can be fitted onto the shaft-shaped joint portion 7 is provided. The tubular joint portion 9 is fitted onto the shaft-shaped joint portion 7 and provided between the joint portions 7 and 9. By joining the joint portions 7 and 9 with the joining mechanism 23, the columnar bodies 1 and 2 are positioned on the substantially same axis L and are joined to each other so that they cannot be inserted and removed. The joining mechanism 23 is composed of a key groove 8 provided on the outer periphery of the shaft-like joint portion 7 and a joining member 14 integrally provided with a key 16 that can be fitted into the key groove 8. The key 16 of the member 14 is a slit 1 provided in the cylindrical joint portion 9 from the outside of the cylindrical joint portion 9. 1 is inserted into the key groove 8 and the joining member 14 is fixed to the tubular joint portion 9 by a bolt 12 screwed to the tubular joint portion 9 so as to be unlockable. It is in a place where it is prevented from coming off from the joint 9 .
[0010]
According to the characteristic configuration of the invention of claim 4, the joining mechanism provided between the shaft-like joint portion and the cylindrical joint portion that can be fitted onto the shaft-like joint portion is provided on the outer periphery of the shaft-like joint portion. And a key that can be freely inserted into the key groove. The key of the bonding member is provided on the cylindrical joint portion from the outside of the cylindrical joint portion. Since the slit is inserted into the key groove, the key can be inserted into the key groove from the outside of the cylindrical joint portion, and the insertion operation is integrally provided with the key. It will be performed directly by the joining member and the key is inserted into the slit of the cylindrical joint part, so check whether the key of the joining member has been inserted into the key groove on the shaft joint part side Is relatively easy, and the joining member is removed by a bolt screwed into the cylindrical joint. Since the fit, it is possible to reliably prevent the insertion and removal between the joining of the columnar body to maintain reliably both columnar body having a columnar body and the tubular joint portion having a shaft-like coupling portion.
[0011]
As shown in FIGS. 1 to 6, the characteristic configuration of the invention of claim 5 is a fitting portion 15 in which the joining member 14 is fitted into a recessed portion 10 provided on the outer periphery of the cylindrical joint portion 9 and its fitting. The key 16 is provided integrally with the portion 15 so that the fitting portion 15 can be unlocked from the tubular joint portion 9 while being fitted in the recessed portion 10 of the tubular joint portion 9. It is in a fixed place.
[0012]
According to the characteristic configuration of the invention of claim 5, the joining member is composed of a fitting portion that fits into a recessed portion provided on the outer periphery of the cylindrical joint portion and a key that is integrally projected from the fitting portion, Since the fitting portion is fixed to the cylindrical joint portion so as to be unlockable in a state where the fitting portion is fitted in the concave portion of the cylindrical joint portion, the columnar body having the axial joint portion and the columnar body having the cylindrical joint portion, The joining becomes even more reliable.
[0015]
In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the columnar joint structure according to the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 show a joint structure of columnar bodies according to the first embodiment. For example, a circular steel pipe 1 which is an example of a columnar body built into the ground as a pile or a sheet pile, and the steel pipe 1 are grounded. A circular erection jig 2, which is an example of a columnar body used for erection inside, is positioned on substantially the same axis L and joined to each other so as not to be inserted and removed.
Therefore, the shaft-shaped joint 3 is connected to the upper end of the steel pipe 1 by welding, and the cylindrical joint 4 that can be fitted to the shaft-shaped joint 3 is connected to the lower end of the erection jig 2 by welding. On the outer periphery of the steel pipe 1, a pair of hanging metal fittings 5 having hanging holes 5 a are projected, and the outer periphery of the erection jig 2 receives a rotational force from a pile construction machine (not shown). A pair of rotating metal fittings 6 are provided so that each rotating metal fitting 6 is provided with a hanging hole 6a.
[0017]
The shaft-like joint 3 is formed by casting or forging, or by machining a steel pipe, and its lower part is formed in a cylindrical shape having substantially the same outer diameter as the steel pipe 1, and its upper part is a steel pipe. 1 is formed into a cylindrical shaft joint portion 7 having a diameter smaller than the outer diameter of 1. As shown in detail in FIG. 2, a key groove 8 having a rectangular cross section is formed on the outer periphery of the shaft joint portion 7. , Continuously provided over the entire circumference.
The tubular joint 4 is also formed by casting or forging, or by machining a steel pipe, and its lower end portion is configured as a tubular joint portion 9 that is fitted around the shaft-shaped joint portion 7, and the tube For example, a total of four recessed portions 10 are provided on the outer periphery of the joint portion 9 at equal intervals in the outer peripheral direction. A slit 11 having substantially the same vertical width as that of the key groove 8 is provided in the central portion in the vertical direction of each concave portion 10 so as to communicate with the concave portion 10 over the entire length in the lateral width direction of the concave portion 10. Two screw holes 13 into which the bolts 12 are screwed are provided.
[0018]
Each concave insertion portion 10 of the tubular joint portion 9 is provided with a joining member 14 so as to be freely fitted therein. The respective joining members 14 are integrally formed with an insertion portion 15 that fits into the concave insertion portion 10 and an inner surface of the insertion portion 15. When the fitting portion 15 of the joining member 14 is fitted into the recessed portion 10 with the tubular joint portion 9 being externally fitted to the shaft-like joint portion 7, the protruding portion 16 projects into the inner surface of the fitting portion 15. The key 16 is inserted into the key groove 8 of the shaft-like joint portion 7 through the slit 11, and the outer surface of the fitting portion 15 is flush with the outer peripheral surface of the tubular joint portion 9. It is comprised so that it may not protrude from the outer peripheral surface of the shape joint part 9. FIG.
The insertion portions 15 of the respective joining members 14 are provided with two through holes 17 with counterbore through which the bolts 12 pass, and upper and lower penetrations on the inner surface of each insertion portion 15. A sealing material 18 made of rubber or synthetic resin is attached between the hole 17 and the key 16, and as shown in FIG. 2 (B), between the cylindrical joint portion 9 and the joining member 14. It is comprised so that it may be clamped.
[0019]
Further, a total of four non-rotating cylinder side recessed portions 19 are provided on the outer periphery of the tubular joint portion 9 in the tubular joint 4 so as to be positioned between the recessed portions 10. A total of four shaft-side recessed portions 20 for preventing rotation are provided on the outer periphery of the cylindrical portion in correspondence with the respective cylindrical-side recessed portions 19.
Then, a locking key 21 is fitted over the cylindrical side recessed portion 19 on the cylindrical joint 4 side and the axial side recessed portion 20 on the axial joint 3 side, and is fixed with a bolt 22 or the like, thereby fixing the cylindrical joint 4. And the shaft joint 3 are prevented from rotating relative to each other, and the rotational force from the pile construction machine is transmitted to the shaft joint 3 side via the tubular joint 4.
[0020]
Next, the procedure for joining the steel pipe 1 and the erection jig 2 to each other will be described. For example, the erection jig 2 is suspended and held by using a crane or the like not shown. The cylindrical joint portion 9 on the jig 2 side is externally fitted to the shaft-shaped joint portion 7 on the steel pipe 1 side, and alignment is performed so that the tube-side recessed portion 19 and the shaft-side recessed portion 20 for preventing rotation face each other. Do.
In this fitted state, the key groove 8 on the shaft joint 7 side and the respective slits 11 on the tubular joint portion 9 side are set to face each other. When the insertion portion 15 of the joining member 14 is inserted into the recess portion 10, the key 16 is inserted into the key groove 8 through the slit 11.
That is, a joining mechanism 23 is constituted by a joint member 14 integrally provided with a key groove 8 on the shaft-like joint portion 7 side and a key 16 that can be fitted into the key groove 8, and the joining mechanism 23 forms a steel pipe. 1 and the mounting jig 2 are positioned on substantially the same axis L and are joined together so as not to be inserted and removed.
[0021]
Thereafter, the bolts 12 are respectively inserted into the through holes 17 of the respective insertion portions 15 and screwed into the screw holes 13 on the cylindrical joint portion 9 side, whereby the respective joining members 14 are fixed to the cylindrical joint portion 9 side. .
Further, the rotation key 21 is fitted so as to straddle the cylinder-side recessed portion 19 and the shaft-side recessed portion 20 facing each other, and is fixed by the bolts 22, so that the tubular joint portion 9 and the shaft-shaped joint portion 7 are relative to each other. The rotation, in other words, the relative rotation between the erection jig 2 and the steel pipe 1 is prevented, and the joining operation of both is completed.
Thereafter, the steel pipe 1 and the erection jig 2 are suspended by a crane or the like using the metal fitting 5 for suspending the steel pipe 1 and held in place, and the steel pipe 1 is rotated by a pile construction machine not shown. However, if necessary, the same operation is repeated, and a plurality of steel pipes 1 are sequentially built while being connected to each other.
[0022]
Next, the second to sixth embodiments will be described. In order to avoid duplication, the configurations described in the previous embodiments and the configurations having the same functions are denoted by the same reference numerals and the description thereof is omitted. Only the configuration different from the previous embodiment will be mainly described.
[0023]
3 and 4 show the columnar body joining structure according to the second embodiment, and the slit 11 is provided only in the intermediate portion of the recessed portion 10 in the lateral width direction.
That is, in the first embodiment, the slit 11 through which the key 16 of the joining member 14 is inserted is provided over the entire length in the width direction of the recessed portion 10, but in the second embodiment, the width direction of the recessed portion 10. The slit 11 is provided only at the intermediate portion of the key, and the key 16 of the joining member 14 is correspondingly protruded only at the intermediate portion of the fitting portion 15 in the lateral width direction. It is attached continuously over.
[0024]
FIG. 5 and FIG. 6 show the joining structure of columnar bodies according to the third embodiment, and a slit 11 is directly provided in the tubular joint portion 9.
That is, in 1st and 2nd embodiment, although the recessed part 10 was provided in the outer periphery of the cylindrical coupling part 9, and the slit 11 was provided in the state connected to the recessed part 10, in 3rd Embodiment, it is. The slit 11 is directly provided without providing a recessed portion on the outer periphery of the cylindrical joint portion 9.
In the third embodiment, it is preferable that the joining member 14 is constituted by the joint portion 24 having a relatively thin thickness and the key 16 integrally projecting from the inner surface of the joint portion 24. It is applied to the outer periphery of the joint portion 9, and the sealing member 18 is sandwiched between the tubular joint portion 9 and the joining member 14 and fixed with the bolts 12.
[0025]
FIGS. 7 and 8 show the columnar joint structure according to the fourth embodiment. Unlike the previous embodiments, the key 16 has a cross-sectional shape T having a narrow key portion 16a and a wide key portion 16b. The key 16 and the fitting member 15 are formed separately. That is, in the first and second embodiments shown in FIGS. 1 to 4, the key groove 8 on the shaft joint portion 7 side and the slit 11 on the tubular joint portion 9 side have substantially the same vertical width. However, in the fourth embodiment, the vertical width of the slit 11 is configured to be wider than the vertical width of the key groove 8, and the cross-section is T-shaped across the wide slit 11 and the narrow key groove 8. The key 16 is configured to be freely inserted, and a recessed portion 10 is provided across the slit 11.
And the key 16 and the insertion part 15 which comprise the joining member 14 are comprised separately, and in the state which inserted the key 16 over the key groove 8 and the slit 11, the insertion part 15 straddling the up-and-down recessed part 10 on the outer side The bolt 12 is inserted into the through hole 17 with counterbore of the insertion part 15 and screwed into the screw hole 13 on the cylindrical joint part 9 side, so that the outer surface of the insertion part 15 is The joining member 14 is configured to be flush with the outer peripheral surface and can be fixed to the cylindrical joint portion 9, and the sealing material 18 is sandwiched between the inner surface of the wide key portion 16 b and the outer peripheral surface of the shaft-like joint portion 7. It is configured as follows.
[0026]
FIG. 9 and FIG. 10 show the joining structure of the columnar bodies according to the fifth embodiment. Like the fourth embodiment, FIG. 9 and FIG. 10 have a T-shaped cross section having a narrow key portion 16a and a wide key portion 16b. The key 16 is configured to be able to be fitted over the key groove 8 on the shaft joint 7 side and the slit 11 on the tube joint 9 side, and further above the slit 11 is a recessed portion penetrating the tube joint 9. 10 is provided.
Like the fourth embodiment, the insertion portion 15 constituting the joining member 14 is configured separately from the key 16, but unlike the fourth embodiment, the insertion portion 15 includes a pair of insertion portions 15. It is comprised in the U-shape which has the leg part 15a.
Then, in a state where the key 16 is fitted over the key groove 8 and the slit 11, the U-shaped fitting portion 15 that passes through the recessed portion 10 is positioned so as to straddle the key 16 and the shaft-like joint portion 7, By pressing the tip of the bolt 27 screwed into the leg portion 15a located inside the joint portion 7 against the inner peripheral surface of the shaft-like joint portion 7, the fitting member 15 enters the recessed portion 10 in a state where 14 is configured to be fixed to the cylindrical joint portion 9 and the shaft-shaped joint portion 7, and is further configured to sandwich the sealing material 18 between the inner surface of the wide key portion 16 b and the outer peripheral surface of the shaft-shaped joint portion 7. ing.
[0027]
FIGS. 11-13 shows the joining structure of the columnar body by 6th Embodiment, and the wide slit 11 which penetrates the cylindrical joint part 9 is provided similarly to 4th and 5th embodiment, A bottomed recess 10 is provided above and below the slit 11, and a key groove 28 corresponding to the key groove 8 of the shaft joint 7 is formed on the left and right sides of the slit 11 on the inner peripheral surface of the cylindrical joint 9. It is provided so as to open in the part.
The joining member 14 includes a pair of left and right keys 16 having a head portion 16c and a fitting portion 15 having notches 15b on the left and right sides and fitting into the slit 11 and the recessed portion 10. In other words, a tongue piece 15c fitted into the recessed portion 10 is integrally provided above and below the fitting portion 15 so that the slit 11 also serves as a part of the recessed portion 10, and the cross provided with the tongue piece 15c. A shaped fitting portion 15 is configured to be freely fitted into the recessed portion 10.
[0028]
In the sixth embodiment, a pair of left and right sides from the slit 11 are schematically shown in FIGS. 12A and 12B in a state in which the cylindrical joint portion 9 is externally fitted to the shaft-like joint portion 7. 13, for example, the right key 16 is inserted into the key groove 8 of the shaft-like joint portion 7, and the key 16 is driven to the right, as shown in FIG. As described above, it is fitted over the key groove 8 of the shaft joint portion 7 and the key groove 28 of the tubular joint portion 9. Thereafter, the left key 16 is similarly inserted into both the key grooves 8 and 28, and the insertion portion 15 is inserted over the slit 11 that also serves as a part of the recess and the recess 10.
Then, the heads 16 c of the left and right keys 16 are fitted into the notches 15 b of the fitting part 15, and the tongue pieces 15 c of the fitting part 15 are fitted into the recessed parts 10 positioned above and below the slit 11. Thereafter, the bolt 12 is inserted into the through hole 17 with counterbore provided in the tongue piece 15c of the fitting portion 15 and screwed into the screw hole 13 on the cylindrical joint portion 9 side, so that FIG. As shown, the outer surface of the fitting portion 15 is flush with the outer peripheral surface of the cylindrical joint portion 9 so that the joining member 14 including the fitting portion 15 and the pair of left and right keys 16 can be fixed to the cylindrical joint portion 9. It is configured.
According to the sixth embodiment, the key grooves 8 and 28 of the shaft-like joint portion 7 and the cylindrical joint portion 9 and the joining member 14 function as the joining mechanism 23, and two slits 11 are connected to the two slits 11. Since the key 16 can be inserted, the key 16 having a length nearly twice the width of the slit 11 can be inserted into both the key grooves 8 and 28.
[0029]
In the embodiments described so far, the steel pipe 1 and the erection jig 2 that are built into the ground are shown as examples of the columnar bodies that are joined so as not to be inserted and removed. However, the present invention is also applicable to joining the steel pipes 1 to each other. Can do.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a joint structure of columnar bodies according to a first embodiment. FIG. 2 is a cross-sectional view showing a main part of the joint structure according to the first embodiment. FIG. 4 is a cross-sectional view showing the main part of the joint structure according to the second embodiment. FIG. 5 is an exploded perspective view showing the main part of the joint structure according to the third embodiment. 6 is a cross-sectional view showing the main part of the joint structure according to the third embodiment. FIG. 7 is an exploded perspective view showing the main part of the joint structure according to the fourth embodiment. FIG. 9 is an exploded perspective view showing the main part of the joint structure according to the fifth embodiment. FIG. 10 is a cross-sectional view showing the main part of the joint structure according to the fifth embodiment. FIG. 12 is an exploded perspective view showing the main part of the joint structure according to the sixth embodiment. Schematic diagram illustrating a procedure 13 is a sectional view showing a main part of a sixth cross-sectional view [FIG. 14] conventional joining structure showing the main portion of the joint structure according to an embodiment of the REFERENCE NUMERALS]
1 and 2 Columnar body 7 Axial joint part 8 Key groove on the outer periphery of the 8 axis joint part 9 Tubular joint part 10 Recessed part 11 Slit 12 Bolt 14 Joining member 15 Fitting part
15b Notch 16 key
16c key head 18 sealing material 23 joining mechanism
28 Keyway L on the inner circumference of the cylindrical joint

Claims

One columnar body adjacent to each other in the axial direction is provided with a shaft joint portion, and the other columnar body is provided with a cylindrical joint portion that can be fitted over the shaft joint portion. The two columnar bodies are positioned substantially on the same axis and cannot be inserted or removed by being externally fitted to the shaft-like joint portion and joining the joint portions by a joining mechanism provided between the joint portions. It is a joining structure of joined columnar bodies,
The joining mechanism, and the key groove provided on the inner periphery of the outer and the tubular joint portion of the shaft-like coupling portion, a fitting freely key over the key groove of the shaft-shaped joint portion and the cylindrical fitting portion In the state where the key of the joining member is inserted into the key groove through the slit provided in the tubular joint portion from the outside of the tubular joint portion. Is a columnar joint structure that is fixed to the cylindrical joint portion so as to be unlockable and is prevented from coming off from the cylindrical joint portion.

The joining member includes a recessed portion provided on the outer periphery of the cylindrical joint portion and a fitting portion to be fitted into the slit , and the fitted portion is fitted into the recessed portion and the slit of the cylindrical joint portion, The joining structure of the columnar bodies according to claim 1, wherein the columnar body is fixed to the cylindrical joint portion so as to be unlockable by a bolt that is screwed into the cylindrical joint portion .

The key is a key having a head part, and the head part of the key is fitted into a notch provided in the fitting part in a state where the fitting part is fitted into the slit and the recessed part of the cylindrical joint part. bonding structure for pillars according to claim 2 which is retained Te.

One columnar body adjacent to each other in the axial direction is provided with a shaft joint portion, and the other columnar body is provided with a cylindrical joint portion that can be fitted over the shaft joint portion. The two columnar bodies are positioned substantially on the same axis and cannot be inserted or removed by being externally fitted to the shaft-like joint portion and joining the joint portions by a joining mechanism provided between the joint portions. It is a joining structure of joined columnar bodies,
The joining mechanism includes a key groove provided on the outer periphery of the shaft-like joint portion and a joining member integrally provided with a key that can be fitted into the key groove, and the key of the joining member is the cylinder. In a state where the slit provided in the cylindrical joint portion is inserted from the outside of the cylindrical joint portion and is inserted into the key groove, the joint member is attached to the cylindrical joint portion by a bolt that is screwed into the cylindrical joint portion. A joining structure of columnar bodies that are fixed so as to be unlockable and are prevented from coming off from the cylindrical joint portion .

The joining member includes an insertion portion that fits into a recessed portion provided on an outer periphery of the cylindrical joint portion, and the key that protrudes integrally with the insertion portion, and the insertion portion is the cylindrical joint. The joining structure of the columnar bodies according to claim 4, wherein the columnar body is fixed so as to be able to be fixedly released with respect to the cylindrical joint portion in a state of being fitted into the recessed portion of the portion .