JP2004036251A

JP2004036251A - Joint structure and joining method for steel cylinder

Info

Publication number: JP2004036251A
Application number: JP2002195512A
Authority: JP
Inventors: Yutaka Kano; 鹿野　裕
Original assignee: Sumitomo Metal Industries Ltd
Current assignee: Nippon Steel Corp
Priority date: 2002-07-04
Filing date: 2002-07-04
Publication date: 2004-02-05

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure and a joining method therefor, which enable steel cylinders such as steel pipe piles to be joined together without welding in a short period of time, and can provide great joining strength. <P>SOLUTION: A male joint 22 with an outer peripheral tapered part 22b is provided at the end of one 21 of the steel cylinders for being mutually joined, and a female joint 12 with an inner peripheral tapered part 12a is provided at the end of the other steel cylinder 11. The tapered part 22b of the the male joint 22 is externally fitted into the tapered part 12a of the female joint 12, and an annular locking part 13 of the tapered part 12a and an annular locking part 23 of the tapered part 22b are engaged with each other. An annular body 32, whose inner peripheral surface has an inner peripheral tapered part 32a, is externally fitted into an outer peripheral tapered part 12b which is formed on the outer peripheral surface of the end of the female joint 12, and a joint part, in which both the joints 12 and 22 are joined together, is fastened by virtue of a wedge effect. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本願発明は、鋼製円柱体の継手構造および接合方法に関するもので、鋼管杭等の杭や、建築物・構築物の構造材、長柱等の接続に利用することができる。
【０００２】
なお、本願でいう鋼製円柱体は、部材としての柱に限定される意味ではなく、外形が円柱状であることを意味し、中実の場合に限らず、一部または全長が中空の筒状である場合も含む。また、鋼製円柱体の全体が鋼製である必要はなく、一部が鋼製で他の部分が鋼以外であってもよい。
【０００３】
【従来の技術】
長尺の鋼管杭を地盤中に設置する場合、現場に運搬可能な長さに制限があるため、短い鋼管杭を現場において継ぎ合わせる必要がある。従来、この継ぎ杭作業は溶接が一般的であった。
【０００４】
しかしながら、作業環境の悪い現場で行う溶接には優れた溶接技術と慎重な施工管理が必要であり、また厚さの大きい鋼管杭が用いられる地滑り抑止工事等においては、鋼管杭の継ぎ合わせ溶接部の品質の確保が問題となっている。
【０００５】
その上、近年、優秀な溶接工の確保がますます困難な状況にあり、このようなことから、溶接をしないで簡単に鋼管杭を接続できる継手（以下、無溶接継手と称す）の開発が求められていた。
【０００６】
このような無溶接継手として、既に多くの技術が開発されており、代表的な方式として以下に述べるようなものがある。
【０００７】
（１）　雄ねじと雌ねじを螺合する方式
特開平１０−３１１０２８号公報には、図１１に示すように、接合すべき鋼管杭５１ａ，５１ｂの端部に雄ねじ５３ａを有する下端部金物５２ａと雌ねじ５３ｂを有する上端部金物５２ｂを溶接し、雄ねじ５３ａと雌ねじ５３ｂの螺合により接合する継手が記載されている。
この他、雄ねじと雌ねじを螺合する方式としては、特開平９−２５６３５７号公報記載の鋼管杭の継手等がある。
【０００８】
（２）　テーパ管どうしを嵌合する方式
特開平５−２９５７２５号公報には、図１２に示すように、接合すべき鋼管杭６１ａ，６１ｂの端部に互いに嵌合する複数の段差のテーパ６２ａ，６２ｂを形成した印籠継手が記載されている。
この他、テーパ管どうしを嵌合する方式としては、特開平７−１５０５５３号公報記載の鋼管杭の継手構造等がある。
【０００９】
（３）　管端に接合したつば状突起どうしを接続金物で結合する方式
特開平８−１４４３８４号公報には、図１３に示すように、鋼管柱の継手構造として、上下の管体７１ａ，７１ｂの端部につば状突起（フランジ）７２ａ，７２ｂを取り付け、これらを半割金物７３ａ，７３ｂで挟み込み、その外面をスリーブ７４で締め付けた構造が記載されている。
【００１０】
（４）　内挿管と外挿管をピンや突起で接合する方式
特開２００１−１１８５０号公報には、鋼管杭の接合構造として、図１４に示すように、接合すべき一方の鋼管杭８１ｂに内挿管８２ｂを溶接し、他方の鋼管杭８１ａの端部に外挿管８２ａを溶接し、外挿管８２ａに内挿管８２ｂを嵌合させ、両者を貫通するピン８３により上下の鋼管杭８１ａ，８１ｂどうしを接合した構造が記載されている。
この他、特開平８−２７７８１号公報には、係合スリットと係合突起の組み合わせにより上下の鋼管杭を接合する継手構造が記載されている。
【００１１】
（５）　その他の接合方式
その他の接合方式として、特開平５−１５６６２８号公報には内挿管と外挿管の間隙に接着剤を注入して接合する方法、特開２００２−６１１７４号公報には特殊な形状に機械加工された継手どうしを嵌合する方法、特開平９−１１９１３２号公報には鋼管杭の突合せ部外周にテーパスリーブを設け、テーパリングで該テーパスリーブを締め付けて接合する継手構造、特開平１０−２４６３６８号公報や特開平１０−２４６３６８号公報には外周面に円錐テーパ面を有する雄テーパ筒体を内周面に円錐テーパ面を有する雌テーパ筒体に押し込んで係合する円環継手が記載されている。
さらに、実開平２−１２０５２５号公報には、図１５に示すように、円筒形鋼管をコンクリート杭９１ａ，９１ｂに固着して継手とし、それらに設けられた嵌合用溝９２ｂと先端突起９２ａを係合させ、その外側に締付用バンド９３を設けた継手構造が記載されている。
【００１２】
【発明が解決しようとする課題】
上記した従来の無溶接継手には、それぞれいくつかの問題点や技術的課題がある。
【００１３】
図１１のような雄ねじ５３ａと雌ねじ５３ｂを螺合する方式の接合構造では、接続に時間がかかるほか、接続した後に鋼管杭を回転圧入する際、地中の障害物に当たった時には、逆方向に回転して障害物に対処する場合があり、この逆方向の回転により雄ねじ５３ａと雌ねじ５３ｂの螺合部が緩むことがある。
【００１４】
図１２のようなテーパー管どうしを嵌合するタイプの継手においては、一方の鋼管６１ａ端部を他方の鋼管６１ｂ端部に挿入する印籠構造としたのが特徴であるが、このような構造は継手に引張力が作用した際に容易に離脱する欠点を有している。
【００１５】
図１３のような管端のつば状突起７２ａ，７２ｂどうしを、半割金物７３ａ，７３ｂおよびスリーブ７４で接合する構造では、スリーブ７４の内面と半割金物７３ａ，７３ｂの外面との隙間が小さいとスリーブ７４の外挿が難しくなり、時間を要し作業性が低下するほか、逆に隙間が大きいと半割金物７３ａ，７３ｂの締め付けが弱くなるため接合強度が低下するといった問題がある。
【００１６】
図１４のような内挿管８２ｂと外挿管８２ａをピン８３や突起で接合する構造においては、ピンや突起とこれらが嵌合する孔との隙間の管理方法によっては、接合部にガタが生じて十分な接合剛性が得られないという問題がある。また、上記隙間が小さすぎたり、孔の加工精度によってはピンや突起の嵌合に必要以上に時間を要して作業性が悪くなるといった問題がある。
【００１７】
その他の接合方式についても、それぞれ課題を有し、図１５の嵌合用溝９２ｂと先端突起９２ａを係合させる構造では、先端突起９２ａが大きい場合には接合時にコンクリート杭の端部に固着した円筒形鋼管が大きく拡開しなければならず、先端突起が小さい場合には十分な接合強度が得られないという問題がある。また、締付用バンド９３を外側に打ち込んで固定するので、打ち込みの作業に手間がかかるほか、打ち込み力により緩みや抜けが生じたり、杭に亀裂が生じるという問題もある。
【００１８】
本願発明は、鋼管杭その他の鋼製円柱体の継手について、テーパ締め付けを利用し、現場における溶接作業を排除した技術であって、鋼製円柱体の特性に合致した改善・改良により、短時間で接合でき、かつ強固な接合強度が得られる無溶接継手構造およびその接合方法を提供することを目的としている。
【００１９】
【課題を解決するための手段】
本願の請求項１に係る発明は、鋼製円柱体どうしの継手構造であって、接続される第１の鋼製円柱体の接続端部の外周面に円錐テーパ状の外周テーパ部が形成され、少なくとも端部が筒状である第２の鋼製円柱体の接続端部の内周面に前記第１の鋼製円柱体の外周テーパ部に外嵌される円錐テーパ状の内周テーパ部が形成されているとともに、前記外周テーパ部と前記内周テーパ部には互いに係合するそれぞれ少なくとも１つの環状係止部が設けられており、かつ前記第２の鋼製円柱体の接続端部の外周面には円錐テーパ状の外周テーパ部が形成され、前記第２の鋼製円柱体の外周テーパ部に、内周面に前記第２の鋼製円柱体の外周テーパ部と嵌合可能な円錐テーパ状の内周テーパ部が形成された環状体が外嵌されるようになっていることを特徴とするものである。
【００２０】
本願発明の継手構造の適用対象となる鋼製円柱体としては、鋼管杭等の杭の他、建築物・構築物の構造材、長柱等が挙げられる。ここで構造材とは、柱、梁、桁、ブレース、スラブ、屋根またはこれらを構成する部材を言い、長柱とはポール、電柱、マスト等を言う。
【００２１】
また、本願でいう鋼製円柱体には、鋼管などの中空のものや、中間が中実で端部のみ筒状のものも含む。さらに、鋼製円柱体の内周テーパ部や外周テーパ部が形成されている接続端部は、鋼製円柱体本体部分と一体成形されたものであってもよいし、別途、製作した継手部を鋼製円柱体本体部分の端部に溶接等により接合したものでもよい。
【００２２】
上記のような構成において、本願発明では、テーパを利用して押し込み係合する継手構造の、嵌合しやすい反面、離脱しやすいという課題に対し、さらにその外周に外嵌され強固な楔効果を発揮する環状体を設けることで、嵌合しやすく、かつ離脱し難いという一見相反する性能を両立させたものである。
【００２３】
請求項２は、請求項１に係る鋼製円柱体の継手構造において、前記環状体の内周面には前記内周テーパ部と別に雌ねじが形成されており、前記第１または第２の鋼製円柱体の外周の前記雌ねじと対峙する位置に、前記雌ねじに螺合可能な雄ねじが形成されていることを特徴とするものである。
【００２４】
環状体側の雌ねじと鋼製円柱体側の雄ねじの螺合により、継手部の係合がさらに強固なものとなり、また環状体が鋼製円柱体の軸方向に摺動して係合状態が弛緩するのを防ぐことができる。
【００２５】
請求項３は、請求項１に係る鋼製円柱体の継手構造において、前記環状体には前記内周テーパ部と別に貫通孔または内周面に内面溝が形成されており、前記第１または第２の鋼製円柱体の外周の前記貫通孔または内面溝と対峙する位置に、前記貫通孔または内面溝に嵌合または係合する突起が設けられていることを特徴とするものである。
【００２６】
この突起と貫通孔または内面溝との嵌合または係合によっても、継手部の係合状態を強固なものとすることができ、また環状体の鋼製円柱体軸方向の摺動を抑制し係合状態の弛緩を防止することができる。
【００２７】
請求項４は、請求項１、２または３に係る鋼製円柱体の継手構造において、前記第１の鋼製円柱体の外周テーパ部と前記第２の鋼製円柱体の内周テーパ部のいずれか１方に軸方向に延びる１以上の溝または貫通孔が形成され、他方に前記溝または貫通孔に嵌合する回転止めのキーが設けられていることを特徴とするものである。
【００２８】
キーが溝または貫通孔に嵌合されることで、接合された鋼製円柱体どうしの相対的な回転が抑止され、いずれか一方の鋼製円柱体が回転トルクを受けた際、回転トルクをもう一方の鋼製円柱体にスムーズに伝達することができる。
【００２９】
請求項５は、請求項１、２、３または４に係る鋼製円柱体の継手構造において、前記第２の鋼製円柱体の内周テーパ部の周方向複数個所に、軸方向に延びるスリットが形成されていることを特徴とするものである。
【００３０】
スリットが形成されていることで、内周テーパ部を形成した部分が鋼製円柱体の断面半径方向外側に変形しやすくなり、継手部における嵌合あるいは係合が容易になる。
【００３１】
本願の請求項６に係る発明は、鋼製円柱体どうしの接合方法であって、第１の鋼製円柱体の接続端部の外周面に形成された円錐テーパ状の外周テーパ部に、少なくとも端部が円筒状の第２の鋼製円柱体の接続端部の内周面に形成された円錐テーパ状の内周テーパ部を外嵌し、前記外周テーパ部と前記内周テーパ部のそれぞれに設けられた環状係止部どうしを係合させた後、前記第２の鋼製円柱体の接続端部の外周面に形成された円錐テーパ状の外周テーパ部に、内周面に前記第２の鋼製円柱体の外周テーパ部に嵌合可能な円錐テーパ状の内周テーパ部が形成された環状体を外嵌することにより、該環状体で前記第２の鋼製円柱体の外周テーパ部を締め付け、前記第１および第２の鋼製円柱体どうしを接続することを特徴とするものである。
【００３２】
このように接合することにより、現場における溶接作業がほとんど必要なく、短時間で２つの鋼製円柱体を強固に接合させることができる。また、この方法により鋼製円柱体の離脱しにくい接合構造を得ることができる。
【００３３】
【発明の実施の形態】
図１は、本願発明の継手構造の一実施形態を示したもので、（ａ）　は継手係合部分の縦断面図、（ｂ）　は係合部の拡大断面図、（ｃ）　は鋼製円柱体本体を除く継手部の斜視図である。
【００３４】
図１の上部に位置する一方の鋼製円柱体２１の端部には、軸方向端部外周面を円錐テーパ状にした外周テーパ部２２ｂを有する雄継手２２が溶接されており、雄継手２２の外周テーパ部２２ｂには鋸歯状の環状係止部２３が形成されている。
【００３５】
一方、図の下部に位置するもう一方の鋼製円柱体１１の端部には、軸方向端部内周面を円錐テーパ状にした内周テーパ部１２ａを有する雌継手１２が溶接されており、雌継手１２の内周テーパ部１２ａにも雄継手２２に設けられた環状係止部２３と係合するよう鋸歯状の環状係止部１３が形成されている。
【００３６】
さらに、雌継手１２の端部外周面には円錐テーパ状の外周テーパ部１２ｂが形成されており、その外周にはこの外周テーパ部１２ｂに外嵌され、楔効果によって締め付ける円錐テーパ状の内周テーパ部３２ａを有する環状体３２が、雄継手１１の外周から雌継手１２の外周にかけて配設されており、この環状体３２は鋼製円柱体１１，２１の軸方向（図の上下方向）に摺動可能な構造となっている。
【００３７】
なお、図の雄継手２２の外周テーパ部２２ｂと反対側の端部近傍の外周面には雄ねじ２４が形成されており、環状体３２の内周テーパ部３２ａと反対側の端部近傍の内周面には前記雄ねじ２４と螺合するよう雌ねじ３４が形成されている。
【００３８】
図２は、本願発明の継手構造の他の実施形態を示したもので、図１の継手構造に対し、上下の鋼製円柱体１１，２１が接続された状態でいずれか一方の円柱体が回転トルクを受けた際に、継手を介してもう一方の円柱体に回転トルクが伝達されるように改良を施したものである。
【００３９】
図においては、雄継手２２の外周テーパ部２２ｂならびに雌継手１２の内周テーパ部１２ａの軸方向にキー溝１５，２５を設け、これらのキー溝１５，２５に回転止めキー３５を嵌入することで、雌雄両継手１２，２２が相互に回転しないような構造としている。
【００４０】
回転止めキー３５ならびにキー溝１５，２５は雌雄両継手１２，２２の円周方向に複数個所設けてもよい。
【００４１】
また、雌継手１２の内周テーパ部１２ａと雄継手２２の外周テーパ部２２ａのいずれか一方に突起を設け、他方に該突起と嵌合する凹部を設けても同様の回転止め効果が得られる。
【００４２】
図３は、図１および図２の実施形態における継手構造を介して２つの鋼製円柱体１１，２１を接続する方法を説明するための縦断面図である。
【００４３】
まず、図３（ａ）　に示すように、接続すべき２つの鋼製円柱体１１，２１のうち、一方の鋼製円柱体２１の雄継手２２の軸方向端部の外周テーパ部２２ｂにに、もう一方の鋼製円柱体１１の雌継手１２の軸方向端部の内周テーパ部１２ａを外嵌し、環状係止部１３，２３どうしを係合させる（図１（ｂ）　参照）。
【００４４】
次に、図３（ｂ）　に示すように、雌継手１２の軸方向端部の外周テーパ部１２ｂに、内周テーパ部３２ａを有する環状体３２を外嵌し、テーパ面での楔効果を利用して締め付けることにより、鋼製円柱体１１，２１どうしを接続する。
【００４５】
この際、環状体３２の端部内面に設けられた雌ねじ３４と、この雌ねじ３４と対峙する雄継手２２の外面に設けられた雄ねじ２４とを、環状体３２を回転させて螺合させることにより、雌雄両継手１２，２２の係合を強固にするとともに、環状体３２が雌雄両継手１２，２２の軸方向に容易に摺動し、係合状態が弛緩してしまわないような構造となっている。
【００４６】
なお、図示しないが、上記環状体３２を回転しやすいように、該環状体３２の外面に凹凸を施し、該凹凸部に回転補助用治具を取り付け、あるいは嵌め込むことで、現場作業が容易となる構造としてもよい。
【００４７】
また、雌雄両継手１２，２２を接続した後、前記環状体３２が不用意に回転して雌雄両継手１２，２２の係合が弛緩しないような構造、例えば点溶接で環状体３２と雄継手２２、あるいは環状体３２と雌継手１２とを一体化するようにしてもよいし、環状体３２を貫通するボルトを雄継手２２あるいは雌継手１２にねじ込んで一体化させるようにしてもよい。
【００４８】
図４は、本願発明の継手構造のさらに他の実施形態について、鋼製円柱体本体を除く継手部を示したもので、図１の実施形態のように環状体３２と雄継手２２を螺合させることで環状体３２を継手の軸方向に摺動させる構造に代わり、環状体３２の内周テーパ部３２ａと軸方向反対側に貫通孔３６を設け、貫通孔３６と対峙する雄継手２２の外周面に該貫通孔３６に嵌合する突起２６を設けた構造としている。
【００４９】
図４では突起２６を棒状体で示しているが、環状体３２の貫通孔３６に嵌合する構造であればどのような形状であってもよい。また、図４では貫通孔３６になっているが、環状体３２の内面に形成された貫通しない溝であってもよい。
【００５０】
さらに、図４では環状体３２に形成された貫通孔３６の形状が階段状になっているが、これは棒状体の突起２６を貫通孔３６に係止させることにより、環状体３２が継手の軸方向に容易に摺動して雌雄両継手１２，２２の係合が弛緩してしまうことがないようにするためである。
【００５１】
したがって、図示しないが、貫通孔３６を階段状とせずに、例えば継手軸方向に斜めに設けた長孔とし、該長孔に嵌合する棒状体をねじを有するボルトにし、該ボルトを図４に示した雄継手２２の外周面にねじ込む構造とし、該ボルトの頭部で前記環状体３２の外周面を締め付けることにより、同様の効果を有する構造としてもよい。
【００５２】
図５は、本願発明の継手構造のさらに他の実施形態について、鋼製円柱体本体を除く継手部を示したもので、図１の実施形態に対し、雌継手１２の軸方向端部の内周テーパ部１２ａを形成した部分の周方向複数個所に、軸方向のスリット１７を形成したものである。
【００５３】
これにより、雄継手２２の外周テーパ部２２ｂに、雌継手１２の内周テーパ部１２ａを外嵌する際に、雌継手１２の内周テーパ部１２ａを形成した部分が半径方向外側に変形しやすくなり、環状係止部１３，２３どうしを容易に係合させることができる。
【００５４】
また、継手構造における接合強度を大きくするために環状係止部１３，２３の突出高さを大きくする場合にも、スリット１７があることで係合させやすいという利点がある。なお、雌継手１２の内周テーパ部１２ａを形成した部分をさらに変形しやすくするために、この部分の肉厚を薄くしてもよい。
【００５５】
また、環状係止部１３，２３どうしの係合の際、雌継手１２の内周テーパ部１２ａの部分は、弾性変形のみならず塑性変形をしてもよい。なぜなら、雌継手１２の内周テーパ部１２ａが半径方向外側に多少塑性変形したとしても、環状体３２で雌継手１２の外周から締め付けることにより、雄雌両継手１２，２２の環状係止部１３，２３どうしの係合は可能となるからである。
【００５６】
図６は、本願発明における環状係止部１３，２３の形状例として、継手軸方向縦断面を示したものである。（ａ）　，（ｂ）　のいずれも断面形状が鋸歯形状であるが、図６（ｂ）　では個々の係止部の断面形状を台形状としたことにより、図６（ａ）　の場合に比べて係合時に係止部が損耗するのを抑制する効果がある。
【００５７】
本願発明の継手構造における環状係止部に関しては、図６のような多数の連続した環状係止部１３，２３を有するものに限定されず、少なくとも１つの環状係止部があればよい。また、個々の係止部の形状も図６に示すものに限らず、互いに係合可能なものであれば、形状も特に限定されない。例えば、周方向に連続するものに限らず、断続的な係止部でもよいし、ねじのように螺旋状に複数巻き連続しているものでもよい。
【００５８】
図７は、本願発明の継手構造のさらに他の実施形態における継手係合部分の縦断面を示したもので、図の上部に位置する一方の鋼製円柱体２１の端部には、軸方向端部外周面を円錐テーパ状にした外周テーパ部２２ｂを有する雄継手２２が溶接されており、雄継手２２の外周テーパ部２２ｂには環状係止部（図示せず）が設けられている。
【００５９】
一方、図の下部に位置するもう一方の鋼製円柱体１１の端部には、軸方向端部内周面を円錐テーパ状にした内周テーパ部１２ａを有する雌継手１２が溶接されており、雌継手１２の内周テーパ部１２ａにも雄継手２２に設けられた環状係止部と係合するよう環状係止部（図示せず）が設けられている。
【００６０】
雌継手１２の端部外周面は、図１の実施形態とは異なり、図の下方向に先細りの円錐テーパ状の外周テーパ部１２ｂを有し、この外周テーパ部１２ｂに外嵌され楔効果を利用して締め付ける円錐テーパ状の内周テーパ部３２ａを有する環状体３２が雌継手１２の外周に配設されており、この環状体３２は、鋼製円柱体１１，１２の軸方向（図の上下方向）に摺動可能な構造となっている。
【００６１】
なお、図の雌継手１２の外周テーパ部１２ｂと反対側の端部近傍の外周面には雄ねじ１８が形成されており、環状体の内周テーパ部１３ａと反対側の端部近傍の内周面には前記雄ねじ１８と螺合するよう雌ねじ３８が形成されている。
【００６２】
図８は、図７の実施形態における継手構造を介して２つの鋼製円柱体１１，２１を接続する方法を説明するための縦断面図である。
【００６３】
まず、図８（ａ）　に示すように、接続すべき２つの鋼製円柱体１１，２１のうち、一方の鋼製円柱体２１の雄継手２２の軸方向端部の外周テーパ部２２ｂに、もう一方の鋼製円柱体１１の雌継手１２の軸方向端部の内周テーパ部１２ａを外嵌し、環状係止部どうしを係合させる（例えば図６、図９の環状係止部１３，２３参照）。
【００６４】
次に、図８（ｂ）　に示すように、雌継手１２の軸方向端部の外周テーパ部１２ｂに、内周テーパ部３２ａを有する環状体３２を外嵌し、テーパ面での楔効果を利用して締め付けることにより、鋼製円柱体１１，２１どうしを接続する。
【００６５】
この際、環状体３２の端部内面に設けられた雌ねじ３８と、この雌ねじ３８と対峙する雌継手１２の外面に設けられた雄ねじ１８とを、環状体３２を回転させて螺合させることにより、雌雄両継手１２，２２の係合を強固にするとともに、環状体３２が雌雄両継手１２，２２の軸方向に容易に摺動し、係合状態が弛緩してしまわないような構造となっている。
【００６６】
なお、図示しないが、上記環状体３２を回転しやすいように、該環状体３２の外面に凹凸を施し、該凹凸部に回転補助用治具を取り付け、あるいは嵌め込むことで、現場作業が容易となる構造としてもよい。
【００６７】
図９は、上述した図７の実施形態における鋼製円柱体本体部分を除く継手部の斜視図である。
【００６８】
図示しないが、図４と同様、環状体３２と雌継手１２を螺合する雌ねじ３８（図７参照）と雄ねじ１８の代わりに、環状体３２に貫通孔または内面溝を設け、雌継手１２の外面に突起を設け、これらを互いに嵌合させる構造としてもよい。
【００６９】
さらには、図５と同様、雌継手１２の軸方向端部の内周テーパ部１２ａを形成した部分の周方向複数個所に軸方向のスリットを形成することにより、雄継手２２の外周テーパ部２２ｂに雌継手１２の内周テーパ部１２ａを外嵌する際に、雌継手１２の内周テーパ部１２ａを形成した部分が半径方向外側に変形しやくなるようにすれば、環状係止部どうしを容易に係合させることができる。
【００７０】
なお、この場合も、雌継手１２の内周テーパ部１２ａを形成した部分が変形しやすくなるように、その部分の肉厚を薄くしてもよい。
【００７１】
また、上下の鋼製円柱体が接続状態であり、現場施工時にいずれか一方の柱体が回転トルクを受けた際に、継手を介してもう一方の柱体に回転トルクが伝達されるように、図２と同様、雄継手２２の外周テーパ部２２ｂならびに雌継手１２の内周テーパ部１２ａの軸方向にキー溝を設け、これらのキー溝に回転止めキーを嵌入することで、雌雄両継手１２，２２が相互に回転しないような構造、あるいは、雌継手１２の内周テーパ部１２ａと雄継手２２の外周テーパ部２２ａのいずれか一方に突起を設け、他方に該突起と嵌合する凹部を設ける構造としてもよい。
【００７２】
図１０は、本願発明の継手構造のさらに他の実施形態を示したもので、雌雄両継手１２，２２係合後の耐離脱性をさらに向上させるため、雄継手２２の外周テーパ部２２ｂの反対に位置する内周面に、鋼製の補剛材２９を環状に取り付けたものである。
【００７３】
これにより、係合後の継手に軸方向引張荷重や曲げモーメントが作用した際に、雄継手２２の外周テーパ部２２ｂが形成されている部分が半径方向内側に変形しにくくなるので、雌雄両継手１２，２２が離脱するのを防止することができる。
【００７４】
なお、雄継手２２の外周テーパ部２２ｂが形成されている部分の肉厚を厚くすることでも同様の効果が期待できる。
【００７５】
以上の説明では主として鋼管杭の場合を説明したが、本願発明は杭以外、例えば建築物、橋、その他の構築物の柱、梁、桁、斜材、支柱等、あるいは電柱、ポール、マスト等の長柱などにも適用することができる。また、本願発明の継手構造は、端部に鋼製の継手部材を取り付けるなどして、コンクリート杭等の継手として利用することもできる。
【００７６】
【発明の効果】
本願発明の継手構造および接合方法によれば、継手の嵌合を施工現場において短時間で容易に行うことができ、かつ強固な継手性能が得られる。
【００７７】
また、杭に限らず、構造材や長柱に適用した場合においても、合理的な無溶接継手として、安価で高性能、省力的な構造およびその接合方法を得ることができる。
【００７８】
請求項２、３に係る発明によれば、継手部の接合強度をさらに高め、かつ環状体の鋼製円柱体軸方向への摺動による係合状態が弛緩を防止することができる。
【００７９】
請求項４に係る発明によれば、キーが溝または貫通孔に嵌合されることで、鋼製円柱体どうしの相対的な回転が抑止され、鋼製円柱体に作用する回転トルクの伝達もスムーズとなる。
【００８０】
請求項５に係る発明によれば、スリットが形成された部分が接合に際し、鋼製円柱体の断面半径方向外側に変形しやすくなり、継手部における嵌合あるいは係合が容易になる。
【図面の簡単な説明】
【図１】本願発明の継手構造の一実施形態を示したもので、（ａ）　は継手係合部分の縦断面図、（ｂ）　は係合部の拡大断面図、（ｃ）　は鋼製円柱体本体を除く継手部の斜視図である。
【図２】本願発明の継手構造の他の実施形態を示す縦断面図である。
【図３】図１、図２の実施形態における２つの鋼製円柱体の接続手順を示す縦断面図である。
【図４】本願発明の継手構造のさらに他の実施形態における鋼製円柱体本体を除く継手部の斜視図である。
【図５】本願発明の継手構造のさらに他の実施形態における鋼製円柱体本体を除く継手部の斜視図である。
【図６】本願発明における環状係止部の形状例を示す継手軸方向縦断面図である。
【図７】本願発明の継手構造のさらに他の実施形態を示す縦断面図である。
【図８】図７の実施形態における２つの鋼製円柱体の接続手順を示す縦断面図である。
【図９】図７の実施形態における鋼製円柱体本体を除く継手部の斜視図である。
【図１０】本願発明の継手構造のさらに他の実施形態を示す縦断面図である。
【図１１】従来の継手構造の一例を示す継手部の正面図（右側は断面図）である。
【図１２】従来の継手構造の他の例を示す継手部の正面図である。
【図１３】従来の継手構造の他の例を示す継手部の斜視図である。
【図１４】従来の継手構造の他の例を示す継手部の断面図である。
【図１５】従来の継手構造の他の例を示す継手部の正面図（左側は断面図）である。
【符号の説明】
１１…鋼製円柱体、１２…雌継手、１２ａ…内周テーパ部、１２ｂ…外周テーパ部、１３…環状係止部、１５…キー溝、１７…スリット、１８…雄ねじ、
２１…鋼製円柱体、２２…雄継手、２２ｂ…外周テーパ部、２３…環状係止部、２４…雄ねじ、２５…キー溝、２６…突起、２９…補剛材、
３２…環状体、３２ａ…内周テーパ部、３４…雌ねじ、３５…回転止めキー、３６…貫通孔、３８…雌ねじ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joint structure and a joining method for a steel cylindrical body, and can be used for connecting a pile such as a steel pipe pile, a structural material of a building or a building, a long column, or the like.
[0002]
In addition, the steel column body referred to in the present application is not limited to a column as a member, but means that the outer shape is a column shape, and is not limited to a solid case, and a part or the entire length is a hollow cylinder. It includes the case of the shape. Further, it is not necessary that the entirety of the steel columnar body is made of steel, and a part may be made of steel and other parts may be made of other than steel.
[0003]
[Prior art]
When installing a long steel pipe pile in the ground, it is necessary to splice short steel pipe piles on the site because there is a limit to the length that can be transported to the site. Conventionally, this joint pile work was generally performed by welding.
[0004]
However, welding performed in a poor work environment requires excellent welding techniques and careful construction management. Also, in landslide prevention work where thick steel pipe piles are used, welding of steel pipe piles is required. Quality assurance is a problem.
[0005]
In addition, in recent years, it has become increasingly difficult to secure excellent welders, and for these reasons, the development of joints that can easily connect steel pipe piles without welding (hereinafter referred to as non-welded joints) has been developed. Was sought.
[0006]
Many technologies have already been developed for such a non-welded joint, and the following are typical systems.
[0007]
(1) Method of screwing male screw and female screw
In Japanese Patent Application Laid-Open No. H10-311028, as shown in FIG. 11, a lower metal fitting 52a having a male screw 53a at an end of a steel pipe pile 51a, 51b to be joined and an upper metal fitting 52b having a female screw 53b are welded. A joint which is joined by screwing the male screw 53a and the female screw 53b is described.
In addition, as a method of screwing a male screw and a female screw, there is a joint of a steel pipe pile described in Japanese Patent Application Laid-Open No. 9-256357.
[0008]
(2) Method of fitting tapered tubes together
Japanese Unexamined Patent Publication No. Hei 5-295725 describes an ingot joint having a plurality of stepped tapers 62a and 62b fitted to the ends of steel pipe piles 61a and 61b to be joined, as shown in FIG. I have.
In addition, as a method of fitting taper pipes to each other, there is a joint structure of a steel pipe pile described in JP-A-7-150553.
[0009]
(3) A method in which brim-shaped projections joined to the pipe end are joined together with connecting hardware
In Japanese Patent Application Laid-Open No. 8-144384, as shown in FIG. 13, flanges (flanges) 72a and 72b are attached to ends of upper and lower pipes 71a and 71b as joint structures of steel pipe columns, and these are half-finished. A structure is described in which the outer surface is sandwiched between split pieces 73a and 73b and the outer surface thereof is fastened with a sleeve 74.
[0010]
(4) Method of joining the intubation and the outer intubation with pins or protrusions
Japanese Patent Application Laid-Open No. 2001-11850 discloses a joining structure for steel pipe piles, as shown in FIG. 14, in which an inner pipe 82b is welded to one steel pipe pile 81b to be joined and an outer pipe 82b is attached to an end of the other steel pipe pile 81a. A structure is described in which the intubation 82a is welded, the inner intubation 82b is fitted to the outer intubation 82a, and the upper and lower steel pipe piles 81a and 81b are joined by pins 83 penetrating both.
In addition, JP-A-8-27781 discloses a joint structure in which upper and lower steel pipe piles are joined by a combination of an engagement slit and an engagement projection.
[0011]
(5) Other joining methods
As another joining method, Japanese Patent Application Laid-Open No. 5-156628 discloses a method in which an adhesive is injected into a gap between an inner tube and an outer tube to perform bonding, and Japanese Patent Application Laid-Open No. 2002-61174 machined a special shape. Japanese Patent Laid-Open No. Hei 9-119132 discloses a joint structure in which a tapered sleeve is provided on the outer periphery of a butt portion of a steel pipe pile, and the tapered sleeve is tightened and joined by tapering. And Japanese Patent Application Laid-Open No. 10-246368 describe an annular joint in which a male tapered cylindrical body having a conical tapered surface on the outer peripheral surface is pushed into and engaged with a female tapered cylindrical body having a conical tapered surface on the inner peripheral surface. .
Further, in Japanese Utility Model Laid-Open No. 2-120525, as shown in FIG. 15, a cylindrical steel pipe is fixed to concrete piles 91a and 91b to form a joint, and a fitting groove 92b and a tip projection 92a provided in the pipe are engaged. There is described a joint structure in which a fastening band 93 is provided on the outside thereof.
[0012]
[Problems to be solved by the invention]
Each of the above-mentioned conventional non-welded joints has several problems and technical problems.
[0013]
In the joint structure of the method in which the male screw 53a and the female screw 53b are screwed together as shown in FIG. 11, it takes a long time to connect, and when the steel pipe pile is rotationally press-fitted after the connection and hits an underground obstacle, the reverse direction is used. In some cases, the threaded portion of the male screw 53a and the female screw 53b may be loosened by the reverse rotation.
[0014]
The joint of the type in which tapered pipes are fitted to each other as shown in FIG. 12 is characterized by an intaglio structure in which the end of one steel pipe 61a is inserted into the end of the other steel pipe 61b. It has the disadvantage that it easily comes off when tensile force acts on the joint.
[0015]
In the structure in which the flange-like projections 72a and 72b at the pipe ends are joined by the half metal pieces 73a and 73b and the sleeve 74 as shown in FIG. 13, the gap between the inner surface of the sleeve 74 and the outer surface of the half metal pieces 73a and 73b is small. In addition, it is difficult to extrapolate the sleeve 74, and it takes time to reduce the workability. Conversely, if the gap is large, the fastening of the half metal pieces 73a and 73b is weakened, so that the joint strength is reduced.
[0016]
In the structure in which the inner tube 82b and the outer tube 82a are joined by the pins 83 and the projections as shown in FIG. 14, play may occur at the joints depending on the method of managing the gap between the pins and the projections and the holes into which these fit. There is a problem that sufficient joining rigidity cannot be obtained. Further, there is a problem that the gap is too small, and depending on the processing accuracy of the hole, it takes more time than necessary to fit the pin or the projection, and the workability deteriorates.
[0017]
The other joining methods also have problems, and in the structure in which the fitting groove 92b and the tip protrusion 92a are engaged with each other in the structure shown in FIG. 15, when the tip protrusion 92a is large, the cylinder fixed to the end of the concrete pile at the time of joining. There is a problem that when the shape steel pipe has to be greatly expanded and the tip projection is small, sufficient joining strength cannot be obtained. In addition, since the fastening band 93 is driven in and fixed to the outside, it takes time and effort for the driving, and there is also a problem that the driving force causes loosening or pulling out and a pile is cracked.
[0018]
The present invention is a technology that eliminates welding work at the site by using taper tightening for joints of steel pipe piles and other steel cylinders, and improves and improves the characteristics of steel cylinders in a short time. It is an object of the present invention to provide a non-welded joint structure that can be joined at a high temperature and can obtain strong joining strength, and a joining method thereof.
[0019]
[Means for Solving the Problems]
The invention according to claim 1 of the present application is a joint structure between steel cylinders, wherein a conical tapered outer peripheral taper is formed on an outer peripheral surface of a connection end of a first steel cylinder to be connected. A conical tapered inner peripheral taper part which is externally fitted to an outer peripheral taper part of the first steel cylindrical body on an inner peripheral surface of a connection end part of a second steel cylindrical body having at least an end part being cylindrical. Is formed, and the outer peripheral taper portion and the inner peripheral taper portion are provided with at least one annular locking portion that engages with each other, and a connection end portion of the second steel columnar body. A conical tapered outer peripheral taper portion is formed on the outer peripheral surface of the second steel cylindrical body, and the outer peripheral taper portion of the second steel cylindrical body can be fitted on the inner peripheral surface of the second steel cylindrical body. That an annular body having a conical tapered inner peripheral taper is formed. It is an butterfly.
[0020]
Examples of the steel cylinder to which the joint structure of the present invention is applied include piles such as steel pipe piles, structural materials of buildings and structures, long columns, and the like. Here, the structural material refers to a pillar, a beam, a girder, a brace, a slab, a roof, or a member constituting these, and the long pillar refers to a pole, a utility pole, a mast, or the like.
[0021]
In addition, the steel cylindrical body referred to in the present application includes a hollow cylindrical body such as a steel pipe and a cylindrical body having a solid middle portion and only an end portion. Further, the connection end portion of the steel cylindrical body where the inner peripheral taper portion and the outer peripheral taper portion are formed may be integrally formed with the steel cylindrical body main portion, or a separately manufactured joint portion. May be joined to the end of the steel cylindrical body by welding or the like.
[0022]
In the configuration as described above, in the present invention, the joint structure that pushes and engages using a taper has a strong wedge effect that is externally fitted to the outer periphery of the joint structure, while the fitting structure is easy to be fitted, but is easily detached. The provision of the annular body that exerts both seemingly contradictory performances of being easily fitted and difficult to be separated.
[0023]
According to a second aspect of the present invention, in the joint structure for a steel cylinder according to the first aspect, a female screw is formed on an inner peripheral surface of the annular body separately from the inner peripheral taper portion, and the first or second steel is formed. A male screw which can be screwed to the female screw is formed at a position facing the female screw on the outer periphery of the cylindrical body.
[0024]
The screwing of the female screw on the annular body and the male screw on the steel cylindrical body further strengthens the engagement of the joint, and the annular body slides in the axial direction of the steel cylindrical body to loosen the engaged state. Can be prevented.
[0025]
According to a third aspect of the present invention, in the joint structure for a steel cylinder according to the first aspect, an inner surface groove is formed in a through hole or an inner peripheral surface separately from the inner peripheral taper portion in the annular body, and A projection which fits or engages with the through-hole or the inner groove is provided at a position on the outer periphery of the second steel cylindrical body facing the through-hole or the inner groove.
[0026]
The engagement or engagement between the projection and the through hole or the inner surface groove can also strengthen the engagement state of the joint portion, and also suppresses the sliding of the annular body in the axial direction of the steel cylindrical body. Relaxation of the engaged state can be prevented.
[0027]
According to a fourth aspect of the present invention, in the joint structure for a steel cylinder according to the first, second or third aspect, an outer peripheral taper portion of the first steel cylinder and an inner peripheral taper portion of the second steel cylinder are formed. One or more grooves or through-holes extending in the axial direction are formed on one of the sides, and a key for preventing rotation which fits into the groove or the through-hole is provided on the other side.
[0028]
When the key is fitted into the groove or through hole, the relative rotation of the joined steel cylinders is suppressed, and when one of the steel cylinders receives the rotation torque, the rotation torque is reduced. It can be transmitted smoothly to the other steel cylinder.
[0029]
According to a fifth aspect of the present invention, in the joint structure for a steel cylinder according to the first, second, third or fourth aspect, slits extending in the axial direction are provided at a plurality of positions in the circumferential direction of the inner peripheral taper portion of the second steel cylinder. Are formed.
[0030]
Since the slit is formed, the portion where the inner peripheral taper portion is formed is easily deformed outward in the radial direction of the cross section of the steel cylindrical body, and fitting or engagement at the joint portion is facilitated.
[0031]
The invention according to claim 6 of the present application is a method of joining steel cylinders, wherein at least a conical tapered outer peripheral taper formed on an outer peripheral surface of a connection end of the first steel cylinder has at least An end portion of the conical tapered inner peripheral taper portion formed on the inner peripheral surface of the connection end portion of the cylindrical second steel cylinder having an outer end is fitted to the outer peripheral taper portion and the inner peripheral taper portion, respectively. After engaging the annular locking portions provided on the outer peripheral surface of the conical taper formed on the outer peripheral surface of the connection end portion of the second steel cylindrical body, The outer periphery of the second steel cylindrical body is formed with the annular body by externally fitting an annular body having a conical tapered inner peripheral taper portion that can be fitted to the outer peripheral taper portion of the second steel cylindrical body. The first and second steel cylinders are connected by tightening a taper portion.
[0032]
By joining in this manner, the two steel cylinders can be firmly joined in a short time with almost no welding work on site. Further, by this method, it is possible to obtain a joint structure in which the steel cylinder is difficult to be detached.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
1A and 1B show one embodiment of the joint structure of the present invention, in which FIG. 1A is a longitudinal sectional view of a joint engaging portion, FIG. 1B is an enlarged sectional view of an engaging portion, and FIG. It is a perspective view of the joint part except a cylinder main body.
[0034]
A male joint 22 having an outer peripheral taper portion 22b having an outer peripheral surface in a conical taper shape is welded to an end of one steel cylindrical body 21 located at the upper part of FIG. The outer peripheral tapered portion 22b is formed with a sawtooth-shaped annular locking portion 23.
[0035]
On the other hand, a female joint 12 having an inner peripheral taper portion 12a having an inner peripheral surface in a conical taper shape is welded to an end of the other steel cylindrical body 11 located at the lower part of the figure, A serrated annular locking portion 13 is also formed on the inner peripheral taper portion 12 a of the female joint 12 so as to engage with an annular locking portion 23 provided on the male joint 22.
[0036]
Further, a conical tapered outer peripheral tapered portion 12b is formed on the outer peripheral surface of the end portion of the female joint 12, and an outer peripheral tapered portion 12b is fitted around the outer peripheral tapered portion 12b and tightened by a wedge effect. An annular body 32 having a tapered portion 32a is disposed from the outer periphery of the male joint 11 to the outer periphery of the female joint 12, and the annular body 32 extends in the axial direction (vertical direction in the figure) of the steel cylindrical bodies 11, 21. It has a slidable structure.
[0037]
A male screw 24 is formed on the outer peripheral surface of the male joint 22 in the figure near the end opposite to the outer tapered portion 22b, and the inner thread near the end opposite to the inner tapered portion 32a of the annular body 32 is formed. A female screw 34 is formed on the peripheral surface so as to screw with the male screw 24.
[0038]
FIG. 2 shows another embodiment of the joint structure of the present invention, in which one of the upper and lower steel cylinders 11 and 21 is connected to the joint structure of FIG. It is an improvement that the torque is transmitted to the other cylindrical body via the joint when the torque is received.
[0039]
In the figure, key grooves 15 and 25 are provided in the axial direction of the outer peripheral taper portion 22b of the male joint 22 and the inner peripheral taper portion 12a of the female joint 12, and the detent key 35 is fitted into these key grooves 15 and 25. The structure is such that the male and female joints 12, 22 do not rotate with each other.
[0040]
The rotation stop key 35 and the key grooves 15, 25 may be provided at a plurality of positions in the circumferential direction of the male and female joints 12, 22.
[0041]
Also, a similar rotation stopping effect can be obtained by providing a projection on one of the inner peripheral taper portion 12a of the female joint 12 and the outer peripheral taper portion 22a of the male joint 22, and providing a concave portion fitted with the projection on the other. .
[0042]
FIG. 3 is a longitudinal sectional view for explaining a method of connecting two steel cylinders 11 and 21 via the joint structure in the embodiment of FIGS. 1 and 2.
[0043]
First, as shown in FIG. 3 (a), of the two steel cylinders 11 and 21 to be connected, the outer peripheral taper portion 22b at the axial end of the male joint 22 of one steel cylinder 21 is formed. Then, the inner peripheral tapered portion 12a at the axial end of the female joint 12 of the other steel cylinder 11 is externally fitted, and the annular locking portions 13, 23 are engaged with each other (see FIG. 1B).
[0044]
Next, as shown in FIG. 3 (b), an annular body 32 having an inner peripheral tapered portion 32a is externally fitted to the outer peripheral tapered portion 12b at the axial end of the female joint 12, and the wedge effect on the tapered surface is reduced. By using and tightening, the steel cylinders 11 and 21 are connected to each other.
[0045]
At this time, the female screw 34 provided on the inner surface of the end portion of the annular body 32 and the male screw 24 provided on the outer surface of the male joint 22 facing the female screw 34 are screwed together by rotating the annular body 32. In addition, the engagement between the male and female joints 12, 22 is strengthened, and the annular body 32 is easily slid in the axial direction of the male and female joints 12, 22 so that the engagement state is not loosened. ing.
[0046]
Although not shown, irregularities are formed on the outer surface of the annular body 32 so that the annular body 32 can be easily rotated, and a rotation assisting jig is attached or fitted to the irregularities, thereby facilitating on-site work. The structure may be as follows.
[0047]
Further, after the male and female joints 12, 22 are connected, the annular body 32 is rotated carelessly so that the engagement of the male and female joints 12, 22 is not loosened. 22, or the annular body 32 and the female joint 12 may be integrated, or a bolt penetrating the annular body 32 may be screwed into the male joint 22 or the female joint 12 to be integrated.
[0048]
FIG. 4 shows a joint portion of a joint structure according to still another embodiment of the present invention except for a steel cylindrical body. As shown in FIG. 1, the annular body 32 and the male joint 22 are screwed together. By doing so, instead of the structure in which the annular body 32 is slid in the axial direction of the joint, a through hole 36 is provided on the side opposite to the inner circumferential tapered portion 32a of the annular body 32 in the axial direction, and the male joint 22 facing the through hole 36 is formed. The outer peripheral surface is provided with a projection 26 that fits into the through hole 36.
[0049]
In FIG. 4, the projection 26 is shown as a rod-shaped body, but may have any shape as long as it fits into the through-hole 36 of the annular body 32. Although the through hole 36 is shown in FIG. 4, a non-penetrating groove formed on the inner surface of the annular body 32 may be used.
[0050]
Further, in FIG. 4, the shape of the through-hole 36 formed in the annular body 32 is step-shaped, but this is achieved by locking the projection 26 of the rod-shaped body into the through-hole 36 so that the annular body 32 This is to prevent the engagement between the male and female joints 12 and 22 from being loosened by easily sliding in the axial direction.
[0051]
Therefore, although not shown, the through-hole 36 is not formed in a stepped shape, but is formed, for example, as a long hole obliquely provided in the joint axis direction, and a rod-like body fitted into the long hole is formed as a bolt having a screw. May be screwed into the outer peripheral surface of the male joint 22 shown in FIG. 4 and the same effect may be obtained by tightening the outer peripheral surface of the annular body 32 with the head of the bolt.
[0052]
FIG. 5 shows a joint portion of a joint structure according to still another embodiment of the present invention except for a steel cylindrical body, and is different from the embodiment of FIG. An axial slit 17 is formed at a plurality of positions in the circumferential direction at a portion where the circumferential tapered portion 12a is formed.
[0053]
Accordingly, when the inner peripheral taper portion 12a of the female joint 12 is fitted to the outer peripheral taper portion 22b of the male joint 22, the portion where the inner peripheral taper portion 12a of the female joint 12 is formed is easily deformed radially outward. Thus, the annular locking portions 13 and 23 can be easily engaged with each other.
[0054]
In addition, even when the protrusion height of the annular locking portions 13 and 23 is increased to increase the joining strength in the joint structure, there is an advantage that the engagement is easy due to the presence of the slit 17. In order to further facilitate deformation of the portion of the female joint 12 where the inner peripheral tapered portion 12a is formed, the thickness of this portion may be reduced.
[0055]
Further, when the annular locking portions 13 and 23 are engaged with each other, the portion of the inner peripheral tapered portion 12a of the female joint 12 may undergo not only elastic deformation but also plastic deformation. This is because even if the inner peripheral taper portion 12a of the female joint 12 is slightly plastically deformed outward in the radial direction, the annular body 32 is tightened from the outer periphery of the female joint 12 by the annular body 32 to thereby form the annular locking portions 13 of the male and female joints 12, 22. , 23 can be engaged with each other.
[0056]
FIG. 6 shows a longitudinal section in the joint axial direction as an example of the shape of the annular locking portions 13 and 23 in the present invention. Both (a) and (b) have a saw-tooth cross-sectional shape. Thus, there is an effect that the engaging portion is prevented from being worn out at the time of engagement.
[0057]
The annular locking portion in the joint structure of the present invention is not limited to one having a large number of continuous annular locking portions 13 and 23 as shown in FIG. Further, the shape of each locking portion is not limited to that shown in FIG. 6, and the shape is not particularly limited as long as it can engage with each other. For example, it is not limited to the one continuous in the circumferential direction, but may be an intermittent locking part, or may be one continuous spirally like a screw.
[0058]
FIG. 7 shows a longitudinal section of a joint engaging portion in still another embodiment of the joint structure of the present invention, and one end of one steel cylindrical body 21 located at the top of the figure has an axial direction. A male joint 22 having an outer peripheral taper portion 22b having an end outer peripheral surface in a conical taper shape is welded, and the outer peripheral taper portion 22b of the male joint 22 is provided with an annular locking portion (not shown).
[0059]
On the other hand, a female joint 12 having an inner peripheral taper portion 12a having an inner peripheral surface in a conical taper shape is welded to an end of the other steel cylindrical body 11 located at the lower part of the figure, An annular locking portion (not shown) is also provided on the inner peripheral taper portion 12 a of the female joint 12 so as to engage with the annular locking portion provided on the male joint 22.
[0060]
Unlike the embodiment of FIG. 1, the outer peripheral surface of the end of the female joint 12 has an outer tapered portion 12b having a conical taper shape tapered downward in the figure, and is fitted to the outer tapered portion 12b to have a wedge effect. An annular body 32 having a conical tapered inner peripheral taper portion 32a to be tightened by use is disposed on the outer periphery of the female joint 12, and the annular body 32 is formed in the axial direction of the steel cylindrical bodies 11, 12 (in the figure). (Up and down direction).
[0061]
A male screw 18 is formed on the outer peripheral surface near the end opposite to the outer peripheral taper portion 12b of the female joint 12 in the figure, and the inner periphery near the end opposite to the inner peripheral taper portion 13a of the annular body. A female screw 38 is formed on the surface so as to screw with the male screw 18.
[0062]
FIG. 8 is a longitudinal sectional view for explaining a method of connecting two steel cylinders 11 and 21 via the joint structure in the embodiment of FIG.
[0063]
First, as shown in FIG. 8A, of two steel cylinders 11 and 21 to be connected, an outer peripheral taper portion 22b at an axial end of the male joint 22 of one of the steel cylinders 21 is provided. The inner peripheral tapered portion 12a at the axial end of the female joint 12 of the other steel columnar body 11 is externally fitted to engage the annular locking portions (for example, the annular locking portion 13 in FIGS. 6 and 9). , 23).
[0064]
Next, as shown in FIG. 8B, an annular body 32 having an inner peripheral tapered portion 32a is externally fitted to an outer peripheral tapered portion 12b at an axial end of the female joint 12, and a wedge effect on the tapered surface is obtained. By using and tightening, the steel cylinders 11 and 21 are connected to each other.
[0065]
At this time, the female screw 38 provided on the inner surface of the end portion of the annular body 32 and the male screw 18 provided on the outer surface of the female joint 12 facing the female screw 38 are screwed together by rotating the annular body 32. In addition, the engagement between the male and female joints 12, 22 is strengthened, and the annular body 32 is easily slid in the axial direction of the male and female joints 12, 22 so that the engagement state is not loosened. ing.
[0066]
Although not shown, irregularities are formed on the outer surface of the annular body 32 so that the annular body 32 can be easily rotated, and a rotation assisting jig is attached or fitted to the irregularities, thereby facilitating on-site work. The structure may be as follows.
[0067]
FIG. 9 is a perspective view of the joint portion excluding the steel cylindrical body main portion in the embodiment of FIG. 7 described above.
[0068]
Although not shown, similar to FIG. 4, a through hole or an inner surface groove is provided in the annular body 32 in place of the female screw 38 (see FIG. 7) and the male screw 18 for screwing the annular body 32 and the female joint 12 together. Protrusions may be provided on the outer surface, and these may be fitted to each other.
[0069]
Further, similarly to FIG. 5, by forming axial slits at a plurality of positions in the circumferential direction at a portion where the inner circumferential tapered portion 12 a is formed at the axial end of the female joint 12, the outer circumferential tapered portion 22 b of the male joint 22 is formed. When the inner peripheral taper portion 12a of the female joint 12 is externally fitted to the female joint 12, if the portion where the inner peripheral taper portion 12a of the female joint 12 is formed is easily deformed radially outward, the annular locking portions can be connected to each other. It can be easily engaged.
[0070]
Also in this case, the thickness of the female joint 12 at which the inner peripheral tapered portion 12a is formed may be reduced so that the portion is easily deformed.
[0071]
Also, the upper and lower steel cylinders are connected, so that when one of the columns receives rotational torque during construction on site, the rotational torque is transmitted to the other column via the joint. 2, key grooves are provided in the axial direction of the outer peripheral tapered portion 22b of the male joint 22 and the inner peripheral tapered portion 12a of the female joint 12, and the rotation preventing keys are fitted into these key grooves, thereby forming the male and female joints. A structure in which the projections 12 and 22 do not rotate with respect to each other, or a protrusion provided on one of the inner peripheral taper portion 12a of the female joint 12 and the outer peripheral taper portion 22a of the male joint 22, and the other engaging with the protrusion. May be provided.
[0072]
FIG. 10 shows still another embodiment of the joint structure of the present invention. In order to further improve the detachment resistance after the engagement of the male and female joints 12, 22, the outer peripheral tapered portion 22b of the male joint 22 is opposed to the male and female joints 12. A steel stiffener 29 is attached in an annular shape to the inner peripheral surface located at.
[0073]
Accordingly, when an axial tensile load or a bending moment acts on the joint after engagement, the portion of the male joint 22 where the outer peripheral tapered portion 22b is formed is less likely to be deformed inward in the radial direction. 12 and 22 can be prevented from being detached.
[0074]
The same effect can be expected by increasing the thickness of the portion of the male joint 22 where the outer peripheral tapered portion 22b is formed.
[0075]
In the above description, the case of steel pipe piles has been mainly described. It can be applied to long pillars and the like. Further, the joint structure of the present invention can be used as a joint such as a concrete pile by attaching a steel joint member to an end.
[0076]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the joint structure and joining method of this invention of this application, fitting of a joint can be performed easily in a short time in a construction site, and strong joint performance is obtained.
[0077]
Further, even when the invention is applied not only to a pile but also to a structural material or a long column, an inexpensive, high-performance, labor-saving structure and a joining method thereof can be obtained as a reasonable weldless joint.
[0078]
According to the second and third aspects of the present invention, the joint strength of the joint portion can be further increased, and the engagement state due to the sliding of the annular body in the axial direction of the steel cylindrical body can be prevented from relaxing.
[0079]
According to the invention as set forth in claim 4, since the key is fitted into the groove or the through hole, the relative rotation between the steel cylinders is suppressed, and the transmission of the rotational torque acting on the steel cylinder is also suppressed. Become smooth.
[0080]
According to the invention according to claim 5, the portion where the slit is formed is easily deformed outward in the radial direction of the cross section of the steel cylindrical body at the time of joining, and fitting or engagement at the joint portion is facilitated.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a joint structure according to the present invention, in which (a) is a longitudinal sectional view of a joint engaging portion, (b) is an enlarged sectional view of an engaging portion, and (c) is a steel product. It is a perspective view of the joint part except a cylinder main body.
FIG. 2 is a longitudinal sectional view showing another embodiment of the joint structure of the present invention.
FIG. 3 is a longitudinal sectional view showing a procedure for connecting two steel cylinders in the embodiment of FIGS. 1 and 2;
FIG. 4 is a perspective view of a joint portion of a joint structure according to still another embodiment of the present invention, excluding a steel cylindrical body.
FIG. 5 is a perspective view of a joint portion excluding a steel cylindrical body in still another embodiment of the joint structure of the present invention.
FIG. 6 is a longitudinal sectional view in the axial direction of the joint showing an example of a shape of an annular locking portion according to the present invention.
FIG. 7 is a longitudinal sectional view showing still another embodiment of the joint structure of the present invention.
8 is a longitudinal sectional view showing a connection procedure of two steel cylinders in the embodiment of FIG. 7;
FIG. 9 is a perspective view of a joint portion excluding a steel cylindrical body in the embodiment of FIG. 7;
FIG. 10 is a longitudinal sectional view showing still another embodiment of the joint structure of the present invention.
FIG. 11 is a front view (a right side is a cross-sectional view) of a joint portion showing an example of a conventional joint structure.
FIG. 12 is a front view of a joint part showing another example of the conventional joint structure.
FIG. 13 is a perspective view of a joint part showing another example of the conventional joint structure.
FIG. 14 is a sectional view of a joint portion showing another example of the conventional joint structure.
FIG. 15 is a front view (left side is a sectional view) of a joint portion showing another example of the conventional joint structure.
[Explanation of symbols]
11: steel cylindrical body, 12: female joint, 12a: inner peripheral taper portion, 12b: outer peripheral taper portion, 13: annular locking portion, 15: key groove, 17: slit, 18: male screw,
21: steel cylindrical body, 22: male joint, 22b: outer peripheral taper portion, 23: annular locking portion, 24: male screw, 25: key groove, 26: projection, 29: stiffener,
32: annular body, 32a: inner peripheral taper portion, 34: female screw, 35: rotation stop key, 36: through hole, 38: female screw

Claims

A joint structure between steel cylinders, wherein a conical tapered outer peripheral taper is formed on an outer peripheral surface of a connection end of a first steel cylinder to be connected, and at least an end is cylindrical. The inner peripheral surface of the connection end of the second steel cylindrical body is formed with an inner peripheral taper having a conical taper shape fitted to the outer peripheral taper of the first steel cylindrical body. The portion and the inner peripheral taper portion are provided with at least one annular engaging portion that engages with each other, and the outer peripheral surface of the connection end of the second steel cylinder has a conical tapered outer periphery. A tapered portion is formed, and an inner tapered portion of a conical taper shape that can be fitted to an outer tapered portion of the second steel cylinder on an inner peripheral surface of the outer tapered portion of the second steel column. A joint structure of a steel cylindrical body, wherein the formed annular body is fitted to the outside. .

An internal thread is formed on the inner peripheral surface of the annular body separately from the inner peripheral taper portion. The joint structure for a steel cylinder according to claim 1, wherein a possible external thread is formed.

The annular body has a through hole or an inner surface groove formed in the inner peripheral surface separately from the inner peripheral taper portion, and faces the through hole or the inner surface groove on the outer periphery of the first or second steel cylindrical body. The joint structure for a steel cylindrical body according to claim 1, wherein a projection is provided at a position to be fitted or engaged with the through hole or the inner surface groove.

One or more grooves or through holes extending in the axial direction are formed in one of the outer peripheral taper portion of the first steel cylinder and the inner peripheral taper portion of the second steel cylinder, and the other is formed in the other. 4. The joint structure for a steel cylindrical body according to claim 1, further comprising a rotation stop key fitted into the groove or the through hole.

The steel cylinder according to claim 1, 2, 3 or 4, wherein slits extending in the axial direction are formed at a plurality of circumferential positions of the inner peripheral taper portion of the second steel cylinder. Joint structure.

A method of joining steel cylinders to each other, wherein at least one end of the second steel cylinder is formed in a conical tapered outer peripheral taper formed on an outer peripheral surface of a connection end of a first steel cylinder. The conical tapered inner peripheral taper formed on the inner peripheral surface of the connection end of the cylindrical body is externally fitted, and the outer peripheral taper and the inner peripheral taper are provided with each other. After the engagement, the outer peripheral taper of the second steel cylindrical body is formed on the inner peripheral surface of the outer peripheral taper of a conical taper shape formed on the outer peripheral surface of the connection end of the second steel cylindrical body. By externally fitting an annular body having a conical tapered inner peripheral taper that can be fitted to the outer peripheral taper part of the second steel cylindrical body, the first and second steel cylinders are tightened by the annular body. 2. A method for joining steel cylinders, wherein the steel cylinders are connected to each other.