JP3678676B2

JP3678676B2 - Steel pipe connection structure and steel pipe and steel pipe connection joint

Info

Publication number: JP3678676B2
Application number: JP2001173866A
Authority: JP
Inventors: 隆森; 明男相和; 陽一横山; 宏幸江口; 隆上原
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2001-06-08
Filing date: 2001-06-08
Publication date: 2005-08-03
Anticipated expiration: 2021-06-08
Also published as: JP2002363971A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、鋼管柱列土留工法や鋼管杭に使用される鋼管連結構造及び鋼管及び鋼管連結継手に関し、詳しくは、径方向に並設する鋼管本体どうしの並設継手部材を、前記鋼管本体の外側面にその長手方向に沿わせて溶接して鋼管を形成し、前記鋼管の複数をその長手方向に連結してある鋼管連結構造及び鋼管及び鋼管連結継手に関する。
【０００２】
【従来の技術】
従来、鋼管を鋼管柱列土留壁や鋼管杭として用いるには、埋設に際し、隣接する鋼管の長手方向に沿って案内及び互いを結合する必要性があることから、鋼管本体の対向する両外側面に案内結合用の並設継手部材を設けた鋼管が使用されている。
また、これら鋼管は、所定長さの鋼管を沈設するために、複数の定尺鋼管を長手方向で隣接させて互いの鋼管端部を突合せ、その突合せ箇所を溶接接続することで所定の長さの鋼管を形成するが、この溶接作業には、埋設孔に挿入した下鋼管に対して上鋼管をクレーンで吊り下げて互いの鋼管端部を突合せ、その突合せ箇所を人為操作により溶接接続する構成であった。
【０００３】
【発明が解決しようとする課題】
しかし、施工現場で複数の定尺鋼管の管端部を長手方向で突合せ、その突合せ箇所を溶接接続して連結するには、互いの管端部を正確に位置合わせして突合せながら精度良く溶接作業を行う必要性があるため、連結接続作業が困難なものとなっていた。
また、溶接作業を人為操作により行う場合、熟練した溶接工が必要であると共に、溶接部の品質が天候に左右され易く、溶接に伴う裏当てリング等の金具を使用する等面倒で多くの費用を要するだけでなく、多大な手間を要するものであった。
特に、現場溶接であるため足場の問題等で一層熟練と手間を要するものとなり、作業に多くの時間を要するものとなっていた。
このとき、外側面に並設継手部材を設けてある鋼管では、図１３に示すように、前記並設継手部材３が溶接作業の邪魔にならないように鋼管１の突合せ端部の溶接箇所より長手方向内方側にわたる範囲（約３００ｍｍ）を除いて取付けた構造に製作されている。
そして、並設継手部材３が連続していないと、他の並設継手部材３を係合させて案内させる際に、その箇所で引っ掛かりを生じ、案内できなくなる可能性があるから、鋼管１の管端部どうしを溶接接続して連結した後に、両鋼管１の並設継手部材３間に、別途用意しておいた補助並設継手部材９を挿入して、対向する並設継手部材３に対して位置合わせを行いながらの溶接により前記並設継手部材３間を連続させる作業が必要となるため、多大な手間を要するものとなっていた。
そこで、互いの管端部を容易に、正確かつ精度良く接続するために、例えば、機械的に連結される連結機構を備えた筒状継手部と軸状継手部とを、鋼管の管端部に設けて両者を連結接続する構成が考えられているが、外側面に並設継手部材を設けてある鋼管では、前記軸状継手部及び筒状継手部の外側面に前記並設継手部材を溶接接続すると、溶接による熱歪みによって筒状継手部や軸状継手部に備えた連結機構が変形してしまい、両継手部を接続できなくなる可能性があるため、前記軸状継手部及び筒状継手部に位置する箇所の並設継手部材を除いておき、施工現場で前記筒状継手部と軸状継手部とを機械連結した後に、両鋼管の位置合わせをしながら並設継手部材間に補助並設継手部材を挿入して溶接し、並設継手部材間を連続させる作業が必要となるため、熟練した溶接工が必要であると共に、溶接部の品質が天候に左右され易く、溶接に伴う裏当てリング等の金具を使用する等面倒で多くの費用を要するだけでなく、多大な手間を要するものとなっていた。
【０００４】
従って、本発明の目的は、上記問題点を解消し、管端部どうしを簡単に正確かつ精度良く接続することが容易に行えると共に、両鋼管の並設継手部材間に補助並設継手部材を取付けて前記並設継手部材間を連続させるのに要する手間を軽減することが可能な鋼管及び鋼管連結構造及び鋼管連結継手を提供するところにある。
【０００５】
【課題を解決するための手段】
〔構成〕
請求項１の発明の特徴構成は図１，２に例示するごとく、径方向に並設する鋼管本体２どうしの並設継手部材３を、前記鋼管本体２の外側面にその長手方向に沿わせて溶接して鋼管１を形成し、前記鋼管１の複数をその長手方向に連結してある鋼管連結構造であって、長手方向に隣接する前記鋼管本体２の端部夫々に、互いに嵌合し合う一対の筒状継手部７と軸状継手部８とを各別に設け、互いに嵌合した前記筒状継手部と前記軸状継手部とが機械的に連結される連結機構６を前記両継手部７，８に備え、前記鋼管１における前記筒状継手部７と前記軸状継手部８との連結する部分に、長手方向で隣接する前記並設継手部材３夫々に連続するように補助並設継手部材３を、機械的に取付けてあるところにある。
【０００６】
請求項２の発明の特徴構成は図１，２，４に例示するごとく、前記補助並設継手部材９に、前記鋼管１における前記筒状継手部７と前記軸状継手部８との連結する部分に、長手方向で隣接する前記並設継手部材３夫々に連続するように前記補助並設継手部材９を機械的に取付けるための取付部材挿通用の挿通孔１２を設けてあるところにある。
【０００７】
請求項３の発明の特徴構成は図７〜９に例示するごとく、前記補助並設継手部材９に、長手方向で隣接する前記並設継手部材３間に介在させたときに前記並設継手部材３内に内嵌係合する内嵌突出部２５を設けてあるところにある。
【０００８】
請求項４の発明の特徴構成は図１０に例示するごとく、前記連結機構６を、前記筒状継手部７の内周面に周方向に沿う内向き溝部１４を形成すると共に、前記軸状継手部８の外周面に周方向に沿う外向き溝部１５を形成して、前記内向き溝部１４と外向き溝部１５とに跨って嵌入させることにより前記一対の鋼管１を抜け止め状態に接続可能なキー部材２２を設け、前記筒状継手部７の外周面に開口すると共に前記内向き溝部１４に連通するボルト孔１６と、前記ボルト孔１６を介した螺入により前記キー部材２２を出退操作可能な操作ボルト１７を設け、前記筒状継手部７と軸状継手部８とを嵌合させた状態で前記ボルト孔１６への前記操作ボルト１７の螺入により前記内向き溝部１４と外向き溝部１５とに跨る状態にキー部材２２を操作して前記鋼管１の一対を長手方向に連結する構成にすると共に、前記補助並設継手部材９を機械的に取付けるための取付部材を取付ボルト２６により形成し、前記ボルト孔１６を、前記取付ボルト２６の取付孔として兼用してあるところにある。
【０００９】
請求項５の発明の特徴構成は図１１に例示するごとく、前記操作ボルト１７を、ネジ軸体により形成すると共に、前記ボルト孔１６への前記操作ボルト１７の螺入により前記内向き溝部１４と前記外向き溝部１５とに前記キー部材２２を跨らせた状態で、前記操作ボルト１７のネジ軸体端部が前記筒状継手部７の外周面より外方に突出するように形成し、前記ネジ軸体端部に前記補助並設継手部材９に設けた挿通孔１２を挿通させ、前記ネジ軸体端部に対するナット２７の締め付けにより前記補助並設継手部材９を固定してあるところにある。
【００１０】
請求項６の発明の特徴構成は図１２に例示するごとく、隣接する前記並設継手部材３夫々に連続するように前記補助並設継手部材３を機械的に取付けるに際し、前記補助並設継手部材９を前記並設継手部材３に連結固定してあるところにある。
【００１１】
請求項７の発明の特徴構成は、径方向に並設する鋼管本体どうしの並設継手部材を、前記鋼管本体の外側面にその長手方向に沿わせて溶接して取付けると共に、前記鋼管本体の複数をその長手方向に連結接続自在に構成してある鋼管であって、互いに嵌合自在で機械的に連結される連結機構を備えた筒状継手部と軸状継手部のうち少なくとも前記筒状継手部を前記鋼管本体の端部に設け、前記並設継手部材に連続するように補助並設継手部材を機械的に取付ける取付部を、前記筒状継手部に設けてあるところにある。
【００１２】
請求項８の発明の特徴構成は、径方向に並設する鋼管本体どうしの並設継手部材を、前記鋼管本体２の外側面にその長手方向に沿わせて溶接してなる鋼管の複数を、それらの長手方向に連結自在な鋼管連結継手であって、互いに嵌合し合うと共に、機械的に連結される連結機構を備えた筒状継手部と軸状継手部とから構成し、鋼管本体の端部に連結した状態で前記並設継手部材に連続するように設けられる補助並設継手部材を、前記筒状継手部と前記軸状継手部のうちの少なくとも一方に取付け自在な機械連結部を設けてあるところにある。
【００１３】
請求項９の発明の特徴構成は図１０に例示するごとく、前記連結機構６を構成するに、前記筒状継手部７の内周面に周方向に沿う内向き溝部１４を形成すると共に、前記軸状継手部８の外周面に周方向に沿う外向き溝部１５を形成して、前記内向き溝部１４と外向き溝部１５とに跨って嵌入させることにより前記一対の鋼管１を抜け止め状態に接続可能なキー部材２２を設け、前記筒状継手部７の外周面に開口すると共に前記内向き溝部１４に連通するボルト孔１６と、前記ボルト孔１６を介した螺入により前記キー部材２２を出退操作可能な操作ボルト１７を設けて、前記筒状継手部７と軸状継手部８とを嵌合させた状態で前記ボルト孔１６への前記操作ボルト１７の螺入により前記内向き溝部１４と外向き溝部１５とに跨る状態にキー部材２２を操作して前記鋼管１の一対を長手方向に連結自在に構成し、前記補助並設継手部材９を機械的に取付けるための取付部材を取付ボルト２６により形成し、前記ボルト孔１６を、前記取付ボルト２６の取付孔として兼用してあるところにある。
【００１４】
請求項１０の発明の特徴構成は図１１に例示するごとく、前記操作ボルト１７を、ネジ軸体２０により形成すると共に、前記ボルト孔１６への前記操作ボルト１７の螺入により前記内向き溝部１４と前記外向き溝部１５とに前記キー部材２２を跨らせた状態で、前記操作ボルト１７のネジ軸体端部が前記筒状継手部７の外周面より外方に突出するように形成し、前記ネジ軸体端部に前記補助並設継手部材９に設けた挿通孔１２を挿通させ、前記ネジ軸体端部に対するナット２７の締め付けにより前記補助並設継手部材９を固定してあるところにある。
【００１５】
尚、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】
〔作用及び効果〕
請求項１の発明により、管端部どうしを簡単に正確かつ精度良く接続することが容易に行えると共に、両鋼管の並設継手部材間に補助並設継手部材を取付けて前記並設継手部材間を連続させるのに要する手間を軽減することができる。
つまり、従来例のものだと、管端部を突き合わせ、その突合せ箇所を施工現場で溶接する必要があったから、突合せ箇所が横方向に位置ズレを起こし易いだけでなく、溶接に手間のかかるものとなっていたが、本件のものだと、管端部どうしを接続するに際し、鋼管本体の端部夫々に設けた筒状継手部と軸状継手部とを嵌合させるから横方向への位置ズレを防止でき、正確に位置合わせすることが可能となると共に、両継手部に備えた機械的に連結される連結機構により連結接続するから、溶接接続する従来例のものに比して、管端部どうしの接続が容易となる。
また、補助並設継手部材を、筒状継手部と軸状継手部との連結する部分に、長手方向で隣接する並設継手部材夫々に連続するように機械的に取付ける構成を採用してあるため、従来例のように、補助並設継手部材を取付固定するための溶接が不要となるのに伴って、熟練した溶接工を不要にできるだけでなく溶接に必要な機材及び溶接作業に要する手間を軽減することができる。
さらに、補助並設継手部材を機械的に取付ける構成を採用したことによって、取付けに際して熱が発生することがなく、溶接により取付ける構成のもののように、熱歪みによって筒状継手部や軸状継手部に備えた連結機構が変形してしまうのを防止することができるから、前記両継手部を連結する前に筒状継手部と軸状継手部の何れか一方に補助並設継手部材を取付けておくことが可能となる。そのため、工場等で予め補助並設継手部材を取付けておくことによって、現場での並設継手部材間を連続させるのに要する手間を軽減することができる。
その結果、鋼管本体の長手方向に沿う並設継手部材を外側面に設けた鋼管どうしを連結するための作業性を向上させることができる鋼管連結構造を提供できるようになった。
【００１７】
請求項２の発明によれば、請求項１の発明による作用効果を叶えることができるのに加えて、補助並設継手部材を、鋼管における筒状継手部と軸状継手部との連結する部分に取付け易くなる。
つまり、例えば、取付部材をボルトにより構成すると共に、筒状継手部と軸状継手部との連結する部分に前記ボルト螺合用のボルト孔を形成し、補助並設継手部材の挿通孔を介してボルトを挿通させて前記ボルト孔に螺合させるだけで、長手方向で隣接する並設継手部材夫々に連続するように補助並設継手部材を取付けることができるから、溶接工等の熟練工が不要である。
その結果、筒状継手部と軸状継手部との連結する部分に、補助並設継手部材を取付けるための作業性を向上させることができる鋼管連結構造を提供できるようになった。
【００１８】
請求項３の発明によれば、請求項１又は２の発明による作用効果を叶えることができるのに加えて、長手方向で隣接する並設継手部材夫々に連続するように、補助並設継手部材を位置ズレなく取付けることができる。
つまり、例えば、補助並設継手部材を並設継手部材間に取付けたときに前記並設継手部材に対して前記補助並設継手部材が位置ズレを生じていると、複数の鋼管を径方向に並設するために、互いの並設継手部材を介して長手方向に沿って案内するときに、前記位置ズレ箇所で引っ掛かりを生じて案内できなくなる可能性を生じるが、本件のものだと、長手方向で隣接する並設継手部材間に補助並設継手部材を介在させるに際し、補助並設継手部材に設けた内嵌突出部を、並設継手部材内に内嵌させることにより、並設継手部材に対する補助並設継手部材の位置合わせを行い易くなると共に、横方向への位置ズレを防止できるから、並設継手部材間を位置ズレなく連続させることが可能となる。
その結果、補助並設継手部材を、並設継手部材間に介在させる際の取付精度を向上させることができ、位置ズレによる引っ掛かりを防止可能な鋼管連結構造を提供できるようになった。
【００１９】
請求項４の発明によれば、請求項１〜３の発明による作用効果を叶えることができるのに加えて、管端部どうしを正確かつ精度良く接続することが容易に行えると共に、補助並設継手部材を取付けるための取付孔を減らすことができる。
つまり、管端部どうしを接続するに際し、鋼管本体の端部夫々に設けた筒状継手部と軸状継手部とを嵌合させるから横方向への位置ズレを防止でき、正確に位置合わせすることが可能となると共に、両継手部に備えた内向き溝部と外向き溝部とにキー部材を跨って嵌入させる連結機構により連結接続するから、溶接接続する従来例のものに比して、管端部どうしの接続が容易となる。
また、操作ボルトの螺入により前記キー部材を出退操作可能なボルト孔を、補助並設継手部材取付用ボルトのボルト孔として兼用するため、別に補助並設継手部材取付用のボルト孔を設ける必要がなくなるので、鋼管に設けるボルト孔を減らすことができる。
その結果、鋼管本体の長手方向に沿う並設継手部材を外側面に設けた鋼管どうしを連結するための作業性を向上させることができると共に、鋼管に設けるボルト孔を減らすことができるので、欠損部の増加による鋼管の強度低下を抑制することができる鋼管連結構造を提供できるようになった。
【００２０】
請求項５の発明によれば、請求項４の発明による作用効果を叶えることができるのに加えて、管端部どうしを簡単に正確かつ精度良く接続することが容易に行えると共に、補助並設継手部材を取付けるための取付孔を減らすことができる。
つまり、管端部どうしを接続するに際し、鋼管本体の端部夫々に設けた筒状継手部と軸状継手部とを嵌合させるから横方向への位置ズレを防止でき、正確に位置合わせすることが可能となると共に、両継手部に備えた内向き溝部と外向き溝部とにキー部材を跨って嵌入させる連結機構により連結接続するから、施工現場で溶接接続する従来例のものに比して、管端部どうしの接続が容易となる。
また、操作ボルトを、ネジ軸体により形成すると共に、ボルト孔への操作ボルトの螺入により内向き溝部と前記外向き溝部とに前記キー部材を跨らせた状態で、操作ボルトのネジ軸体端部が筒状継手部の外周面より外方に突出するように形成し、ネジ軸体端部に補助並設継手部材に設けた挿通孔を挿通させ、ネジ軸体端部に対するナットの締め付けにより補助並設継手部材を固定するから、別に補助並設継手部材取付用のボルト孔を設ける必要がなく、鋼管に設けるボルト孔を減らすことができるだけでなく、ナットを締め付けて補助並設継手部材を固定するまでの間、前記ネジ軸体端部に前記挿通孔を引っ掛けて補助並設継手部材を保持させることができる。
その結果、鋼管本体の長手方向に沿う並設継手部材を外側面に設けた鋼管どうしを連結するための作業性を向上させることができると共に、補助並設継手部材の取付作業の作業性を向上させることができ、かつ、鋼管に設けるボルト孔を減らすことができるので、欠損部の増加による鋼管の強度低下を抑制することができる鋼管連結構造を提供できるようになった。
【００２１】
請求項６の発明によれば、請求項１〜４の発明による作用効果を叶えることができるのに加えて、例え、鋼管径方向に奥行きの深い補助並設継手部材であっても取付け易いものとなる。
つまり、例えば、鋼管どうしの間隔を広くとって並設するような鋼管柱列土留壁を形成する場合、径方向に隣接する鋼管どうしを互いに案内係合する並設継手部材は、鋼管径方向に奥行きの深いものが使われる。
そのため、長手方向で隣接する並設継手部材夫々に連続するように取付けられる補助並設継手部材も同様に径方向に奥行きの深いものが使われるが、この奥行きの深い補助並設継手部材を径方向からボルト等の取付具により鋼管に対して取付固定しようとした場合、前記取付具操作用の長い操作具が必要となるため、その取付作業が行い難いものとなり易い。
ところが、本発明のものだと、長手方向の上下に位置する夫々の並設継手部材に補助並設継手部材を連結固定する構成を採用してあるため、例えば、補助並設継手部材の上下に取付ブラケットを延設しておいて、そのブラケットを上下の並設継手部材に接当させ、ボルト等の取付具を介して取付固定することにより、補助並設継手部材の奥行きに関係なく取付固定することができるから、長い操作具が不要となる。
その結果、鋼管径方向に奥行きの深い補助並設継手部材であっても、長手方向で隣接する並設継手部材夫々に連続するように取付けるための作業性を向上させることができる鋼管連結構造を提供できるようになった。
【００２２】
請求項７の発明によれば、管端部どうしを簡単に正確かつ精度良く接続することが容易に行えると共に、筒状継手部に予め補助並設継手部材を取付けておくことができる。
つまり、従来例のものだと、管端部を突き合わせ、その突合せ箇所を施工現場で溶接する必要があったから、突合せ箇所が横方向に位置ズレを起こし易いだけでなく、溶接に手間のかかるものとなっていたが、本件のものだと、管端部どうしを接続するに際し、鋼管本体の端部夫々に設けた筒状継手部と軸状継手部とを嵌合させるから横方向への位置ズレを防止でき、正確に位置合わせすることが可能となると共に、両継手部に備えた機械的に連結される連結機構により連結接続するから、溶接接続する従来例のものに比して、管端部どうしの接続が容易となる。
また、補助並設継手部材を長手方向で隣接する並設継手部材夫々に連続するように、筒状継手部に機械的に取付ける構成を採用してあるため、従来例のように、補助並設継手部材を取付固定するための溶接が不要となるのに伴って、熟練した溶接工を不要にできるだけでなく溶接に必要な機材及び溶接作業に要する手間を軽減することができる。
さらに、補助並設継手部材を機械的に筒状継手部に設けた取付部に取付ける構成を採用したことによって、取付けに際して熱が発生することがなく、溶接により取付ける構成のもののように、熱歪みによって筒状継手部に備えた連結機構が変形してしまうのを防止することができるから、補助並設継手部材を、工場等で予め筒状継手部に設けた取付部に取付けておくことが可能となり、現場での並設継手部材間を連続させるのに要する手間を軽減することができる。
その結果、鋼管本体の長手方向に沿う並設継手部材を外側面に設けた鋼管どうしを連結するための作業性を向上させることができる鋼管を提供できるようになった。
【００２３】
請求項８の発明によれば、管端部どうしを簡単に正確かつ精度良く接続することが容易に行えると共に、両鋼管の並設継手部材間に補助並設継手部材を取付けて前記並設継手部材間を連続させるのに要する手間を軽減することができる。
つまり、従来例のものだと、管端部を突き合わせ、その突合せ箇所を施工現場で溶接する必要があったから、突合せ箇所が横方向に位置ズレを起こし易いだけでなく、溶接に手間のかかるものとなっていたが、本件のものだと、管端部どうしを接続するに際し、鋼管本体の端部夫々に設けた筒状継手部と軸状継手部とを嵌合させるから横方向への位置ズレを防止でき、正確に位置合わせすることが可能となると共に、両継手部に備えた機械的に連結される連結機構により連結接続するから、溶接接続する従来例のものに比して、管端部どうしの接続が容易となる。
また、補助並設継手部材を、筒状継手部と軸状継手部のうちの少なくとも一方に、長手方向で隣接する並設継手部材夫々に連続するように機械的に取付ける構成を採用してあるため、従来例のように、補助並設継手部材を取付固定するための溶接が不要となるのに伴って、熟練した溶接工を不要にできるだけでなく、溶接に必要な機材及び溶接作業に要する手間を軽減することができる。
さらに、補助並設継手部材を機械的に取付ける構成を採用したことによって、取付けに際して熱が発生することがなく、溶接により取付ける構成のもののように、熱歪みによって筒状継手部や軸状継手部に備えた連結機構が変形してしまうのを防止することができるから、前記両継手部を連結する前に筒状継手部と軸状継手部の何れか一方に補助並設継手部材を取付けておくことが可能となる。そのため、工場等で予め補助並設継手部材を取付けておくことによって、現場での並設継手部材管を連続させるのに要する手間を軽減することができる。
その結果、鋼管本体の長手方向に沿う並設継手部材を外側面に設けた鋼管どうしを連結するための作業性を向上させることができる鋼管連結継手を提供できるようになった。
【００２４】
請求項９の発明によれば、請求項８の発明による作用効果を叶えることができるのに加えて、管端部どうしを簡単に正確かつ精度良く接続することが容易に行えると共に、補助並設継手部材を取付けるための取付孔を減らすことができる。つまり、管端部どうしを接続するに際し、鋼管本体の端部夫々に設けた筒状継手部と軸状継手部とを嵌合させるから横方向への位置ズレを防止でき、正確に位置合わせすることが可能となると共に、両継手部に備えた内向き溝部と外向き溝部とにキー部材を跨って嵌入させることにより一対の鋼管を抜け止め状態に接続可能な連結機構により連結接続するから、施工現場で溶接接続する従来例のものに比して、管端部どうしの接続が容易となる。
また、操作ボルトの螺入により前記キー部材を出退操作可能なボルト孔を、補助並設継手部材取付用ボルトのボルト孔として兼用するから、別に補助並設継手部材取付用のボルト孔を設ける必要がなくなるので、鋼管に設けるボルト孔を減らすことができる。
その結果、鋼管本体の長手方向に沿う並設継手部材を外側面に設けた鋼管どうしを連結するための作業性を向上させることができると共に、鋼管に設けるボルト孔を減らすことができるので、欠損部の増加による鋼管の強度低下を抑制することができる鋼管連結継手を提供できるようになった。
【００２５】
請求項１０の発明によれば、請求項９の発明による作用効果を叶えることができるのに加えて、管端部どうしを簡単に正確かつ精度良く接続することが容易に行えると共に、補助並設継手部材を取付けるための取付孔を減らすことができる。
つまり、管端部どうしを接続するに際し、鋼管本体の端部夫々に設けた筒状継手部と軸状継手部とを嵌合させるから横方向への位置ズレを防止でき、正確に位置合わせすることが可能となると共に、両継手部に備えた内向き溝部と外向き溝部とにキー部材を跨って嵌入させることにより一対の鋼管を抜け止め状態に接続可能な連結機構により連結接続するから、施工現場で溶接接続する従来例のものに比して、管端部どうしの接続が容易となる。
また、操作ボルトを、ネジ軸体により形成すると共に、ボルト孔への操作ボルトの螺入により内向き溝部と前記外向き溝部とに前記キー部材を跨らせた状態で、操作ボルトのネジ軸体端部が筒状継手部の外周面より外方に突出するように形成し、ネジ軸体端部に補助並設継手部材に設けた挿通孔を挿通させ、ネジ軸体端部に対するナットの締め付けにより補助並設継手部材を固定するから、別に補助並設継手部材取付用のボルト孔を設ける必要がなく、鋼管に設けるボルト孔を減らすことができるだけでなく、ナットを締め付けて補助並設継手部材を固定するまでの間、前記ネジ軸体端部に前記挿通孔を引っ掛けて補助並設継手部材を保持させることができる。
その結果、鋼管本体の長手方向に沿う並設継手部材を外側面に設けた鋼管どうしを連結するための作業性を向上させることができると共に、補助並設継手部材の取付作業の作業性を向上させることができ、かつ、鋼管に設けるボルト孔を減らすことができるので、欠損部の増加による鋼管の強度低下を抑制することができる鋼管連結継手を提供できるようになった。
【００２６】
【発明の実施の形態】
以下に本発明の実施の形態を図面に基づいて説明する。尚、図面において従来例と同一の符号で表示した部分は、同一又は相当の部分を示している。
【００２７】
鋼管柱列土留工法に使用される鋼管１を対象として説明する。
前記鋼管１は、径方向に並設する鋼管本体２どうしの並設継手部材３を、鋼管本体２の外側面にその長手方向に沿わせて溶接により取付けてあると共に、互いに嵌合自在で機械的に連結される連結機構６を備えた筒状継手部７と軸状継手部８の少なくとも一方を鋼管本体２の端部に設け、その複数を長手方向に連結接続自在に構成してある。
具体例として、図１，２に示すように、鋼管本体２の下端に鋳鋼製の筒状継手部７を、その軸芯を下鋼管１Ｂの軸芯と同軸芯にして溶接により接続して上鋼管１Ａを形成すると共に、鋼管本体２の上端に鋳鋼製の軸状継手部８を、その軸芯を上鋼管１Ａの軸芯と同軸芯にして溶接により接続して下鋼管１Ｂを形成し、下鋼管１Ｂの軸状継手部８に上鋼管１Ａの筒状継手部７を嵌合接続することにより上下の鋼管１Ａ，１Ｂを連結接続自在に構成してある。
【００２８】
前記筒状継手部７は、図３に示すように、その外径が上下の鋼管本体２の外径と同径に構成され、内径の方は、基端部である上方部分が内側に向かって環状に膨出され、その膨出部に環状の係合凹部１３が設けられると共に、膨出部より下方においては、その内径が上下の鋼管本体２の内径と同径に構成されていて、その内周面には、内側に向かって開口する環状の内向き溝部１４が周方向に沿って上下に２条設けられている。
また、筒状継手部７には、上下２条の内向き溝部１４に沿って、筒状継手部７の外周面に開口し、かつ、各内向き溝部１４に連通するボルト孔１６が夫々複数個設けられ、各ボルト孔１６に対して、操作ボルトの一例としてのセットボルト１７の大径ネジ部１７ａが螺合可能に構成されると共に、筒状継手部７の下端面の外周部には、環状の係合段部１８が設けられている。
【００２９】
前記軸状継手部８は、上鋼管１Ａの筒状継手部７に内嵌可能なように、その外径が筒状継手部７の内径よりも若干小径に構成されて、その先端部には、筒状継手部７の係合凹部１３に係合する環状の係合凸部１９が設けられると共に、軸状継手部８の基端側、つまり、筒状継手部７の下端面に対向する段部面より下方側は、その外径が上下の鋼管１Ａ，１Ｂの外径と同形に構成されている。
また、軸状継手部８の外周面には、外側に向かって開口する環状の外向き溝部１５が周方向に沿って上下に２条設けられ、端部面の外周面には、環状の係合突起２１が設けられていて、この軸状継手部８を上鋼管１Ａの筒状継手部７に内嵌して、係合凸部１９を係合凹部１３に、係合突起２１を係合段部１８に係合させた状態で、筒状継手部７側の内向き溝部１４と軸状継手部８側の外向き溝部１５とが互いに対向して位置し、両溝部１４，１５間に跨ってキー部材２２が嵌め込まれることにより抜け止め状態で互いに機械的に連結される連結機構６が設けられている。
【００３０】
前記キー部材２２は、図４に示すように、両溝部１４，１５の長手方向に複数、この実施形態では６つに分割されていて、その円弧状の分割キー部材２３の数に対応するようにボルト孔１６の数が決められ、その複数のボルト孔１６が、筒状継手部７の周りに等間隔に配置され、かつ、各分割キー部材２３の長手方向の中央には、セットボルト１７の小径ネジ部１７ｂが螺合するボルト孔２４が設けられている。
前記セットボルト１７の大径ネジ部１７ａと小径ネジ部１７ｂとは、互いに逆方向のネジで構成され、したがって、筒状継手部に設けられたボルト孔１６と各分割キー部材２３に設けられたボルト孔２４も、互いに逆方向のネジで構成されている。
【００３１】
かかる構成からなる鋼管１を互いに接続するには、図３（イ）に示すように、各分割キー部材２３を筒状継手部７の内向き溝部１４内に退避させた状態で、下鋼管１Ｂの軸状継手部８に対して上鋼管１Ａの筒状継手部７を外嵌する。そして、筒状継手部７側の係合凹部１３及び係合段部１８と軸状継手部８の係合凸部１９及び係合突起２１とを互いに係合させると、筒状継手部７側の２条の内向き溝部１４と軸状継手部８側の２条の外向き溝部１５とが互いに対向して位置することになる。
その状態で筒状継手部７の外側から各セットボルト１７を操作し、大径ネジ部１７ａが筒状継手部７のボルト孔１６に螺合する方向に回転させる。すると、大径ネジ部１７ａがボルト孔１６に螺合すると同時に、分割キー部材２３が小径ネジ部１７ｂから離脱する方向に移動して、各分割キー部材２３が、図３（ロ）に示すように、筒状継手部７の内向き溝部１４と軸状継手部８の外向き溝部１５とに跨って嵌め込まれ、両鋼管１Ａ，１Ｂが抜け止め状態で接続される。
【００３２】
前記並設継手部材３は、図１，２，５に示すように、鋼管本体２の外側面長手方向に一対設けられた断面Ｏ形の雄部材４と断面Ｃ形の雌部材５とから構成されており、鋼管本体２の外側面にその長手方向に沿わせて溶接により取付け固定されている。
ところが、並設継手部材３を溶接により鋼管本体２の外側面に取付け固定する際に、溶接による熱歪みによって筒状継手部７や軸状継手部８に備えた連結機構６が変形してしまって両継手部７，８を接続できなくなる可能性があるため、筒状継手部７及び軸状継手部８に位置する箇所の並設継手部材３は取り除かれて形成されている。
そして、鋼管本体２の端部夫々に設けた筒状継手部７と軸状継手部８とを嵌合させて連結機構６により連結接続した後に、筒状継手部７と軸状継手部８との連結する部分に、ボルト１１を介して長手方向で隣接する並設継手部材３夫々に連続するように補助並設継手部材９が取付けられる。
【００３３】
前記補助並設継手部材９は、雄部材４と雌部材５夫々に対応する形状に形成された雄継手部材９ａと雌継手部材９ｂとからなり、図１，４に示すように、夫々に筒状継手部７及び軸状継手部８に設けたボルト孔１０に取付自在なボルト１１（取付部材の一例）挿通用の挿通孔１２が設けられており、挿通孔１２を介したボルト孔１０へのボルト１１の螺合操作により、長手方向で隣接する並設継手部材３夫々に連続するように補助並設継手部材９を取付けることができる。
そして、鋼管柱列土留壁として鋼管１を管径方向に並設するには、鋼管本体２夫々に取付け固定してある一方の雄部材４に他方の雌部材５を嵌係合させ、隣接する鋼管１の長手方向に沿って案内させて沈設する。
【００３４】
次に、連結機構６を介して長手方向で連結接続し、所定の長さに形成した鋼管１の複数を土中に並設して鋼管柱列土留壁として形成する工程について説明する。
１）先ず、図６（イ）に示すように、最初の鋼管１を建て込む箇所に、オーガスクリュー２５により縦穴２６を削孔すると共に、オーガスクリュー２５先端からソイルセメント２７を注入して攪拌する。
２）次に、図６（ロ）に示すように、所定長さに連結接続した鋼管１を、クレーンを介して縦穴２６に挿入して建込む。
３）図６（ハ）に示すように、縦穴２６に建込んだ鋼管１の一方の並設継手部材３である雄部材４に、オーガスクリュー２５に取付固定してあるスタビライザー２８（雌部材５の一例）を係合させ、鋼管１の長手方向に沿ってオーガースクリュー２５を案内させて、次に並設する鋼管１の建込み箇所を削孔すると共に、オーガスクリュー２５先端からソイルセメント２７を注入して攪拌する。
４）そして、オーガスクリュー２５を引揚げた後、図６（ニ），（ホ）に示すように、次に建込む鋼管１の他方の並設継手部材３である雌部材５を、先に建込んだ鋼管１の雄部材４に係合案内させながらクレーンを介して鋼管１を建込んで並設する。
その後、必要な回数だけ上記３）、４）の工程を繰り返して鋼管柱列土留壁を形成する。
【００３５】
〔別実施形態〕
以下に他の実施形態を説明する。
【００３６】
〈１〉補助並設継手部材の形状は、補助並設継手部材に、長手方向で隣接する並設継手部材間に介在させたときに並設継手部材内に内嵌係合する内嵌突出部を設けてあるものであっても良い。
これだと、長手方向で隣接する並設継手部材間に補助並設継手部材を介在させるに際し、補助並設継手部材に設けた内嵌突出部を並設継手部材内に内嵌させることにより、並設継手部材に対する補助並設継手部材の位置合わせを行い易くなると共に、横方向への位置ズレを防止できるから、並設継手部材間を位置ズレなく連続させることが可能となり、互いの並設継手部材を介して長手方向に沿って案内するときに位置ズレによる引っ掛かりを防止することができる。
【００３７】
前記補助並設継手部材９の取付けは、図７に示すように、補助並設継手部材９の上下に設けた内嵌突出部２５をバネ３０により出退自在に構成し、内嵌突出部２５を内側にスライドさせて引退させた補助並設継手部材９を並設継手部材３間に位置させて前記上下の内嵌突出部２５を補助並設継手部材３内から突出させ、上下の並設継手部材３内に内嵌係合させた後に、ボルト挿通孔１２を介した取付ボルト１１の螺合により取付固定するものや、図８に示すように、上下の内嵌突出部２５のうち上内嵌突出部２５ａの方を下内嵌突出部２５ｂよりも長く形成し、取付けに際して上内嵌突出部２５ａを先に上方に位置する並設継手部材３内に挿入し、下方向へのスライド移動により下内嵌突出部２５ｂを下方に位置する並設継手部材３内に内嵌係合させた後、ボルト挿通孔１２を介した取付ボルト１１の螺合により取付固定するものであっても良い。
また、前記内嵌突出部２５の形状は、図９（イ）に示すように、円柱形状のものや、図９（ロ）に示すように、一対の板部材を十字に組み付けて形成したものであっても良い。
要するに、並設継手部材内に内嵌係合可能な形状であれば、その形状は任意である。
【００３８】
〈２〉前記補助並設継手部材を取付けるためのボルト孔を、筒状継手部及び軸状継手部に新たに設ける構成のものに限るものではなく、操作ボルトの螺入によりキー部材を出退操作可能なボルト孔を、補助並設継手部材取付用ボルトのボルト孔として兼用させる構成のものであっても良い。
ボルト孔を兼用する際の具体例を示すと、図１０に示すように、セットボルト１７の大径ネジ部１７ａと同径のネジ部を有した取付用ボルト２６を用意し、セットボルト１７を操作して各分割キー部材２３が内向き溝部１４と外向き溝部１５とに跨って嵌め込まれ、両鋼管１が抜け止め状態で接続されたときに、セットボルト１７の大径ネジ部１７ａがボルト孔１６内に引退するように形成し、大径ネジ部１７ａのボルト孔１６への引退により螺合可能となったボルト孔１６に、取付用ボルト２６を螺合して補助並設継手部材９を取付固定する。
これだと、筒状継手部及び軸状継手部に設けるボルト孔を増加させることなく補助並設継手部材を取付けることができるので、ボルト孔による欠損部を増加させなくて済むため、筒状継手部及び軸状継手部における強度の低下を抑制することが可能となる。
（尚、図面では、補助並設継手部材９における雄部材４を例として説明しているが、雌部材５における取付固定も同様であるので、その説明を省略する。）
【００３９】
〈３〉また、ボルト孔だけでなく、ネジ軸を兼用する構成のものであっても良い。
具体例を示すと、図１１に示すように、セットボルト１７を操作して各分割キー部材２３が内向き溝部１４と外向き溝部１５とに跨って嵌め込まれ、両鋼管１が抜け止め状態で接続されたときに、セットボルト１７の大径ネジ部１７ａ端部が筒状継手部７の外周面より外方に突出するように形成し、大径ネジ部１７ａ端部に、補助並設継手部材９に設けた挿通孔１２を挿通させ、大径ネジ部１７ａ端部に対するナット２７の締め付けにより補助並設継手部材９を取付固定する。
これだと、筒状継手部及び軸状継手部に設けるボルト孔を増加させることなく補助並設継手部材を取付けることができるので、ボルト孔による欠損部を増加させなくて済むため筒状継手部及び軸状継手部における強度の低下を抑制することが可能となるだけでなく、ナットを締め付けて補助並設継手部材を固定するまでの間、大径ネジ部端部に挿通孔を引っ掛けて補助並設継手部材を保持させることができるため、補助並設継手部材の取付作業の作業性を向上させることができる。
（尚、図面では、補助並設継手部材９における雄部材４を例として説明しているが、雌部材５における取付固定も同様であるので、その説明を省略する。）
【００４０】
〈４〉前記補助並設継手部材の取付けは、先の実施形態で説明した筒状継手部及び軸状継手部に連結固定するものに限るものではなく、例えば、補助並設継手部材を、長手方向で隣接する並設継手部材に連結固定する構成のものであっても良い。
具体例を示すと、図１２に示すように、補助並設継手部材９の上下に取付ブラケット２８を延設しておいて、そのブラケット２８を上下の並設継手部材３に接当させ、ブラケット２８に形成してあるボルト孔３１（挿通孔の一例）を介して並設継手部材３の取付孔３２にボルト２９を締め付けることにより補助並設継手部材９を並設継手部材３に取付固定する。
これだと、鋼管の径方向に深い補助並設継手部材を採用していたとしても、奥行きの深い補助並設継手部材を径方向からボルト等の取付具により筒状継手部又は軸状継手部に対して取付固定するものに比して、取付具操作用の長い操作具が不要となるので、その取付作業を行い易いものとなる。
【００４１】
〈５〉先の実施形態では鋼管本体の端部夫々に設けた筒状継手部と軸状継手部とを嵌合させて連結機構により連結接続した後に、並設継手部材夫々に連続するように補助並設継手部材を取付ける構成について説明したが、例えば、前記両継手部を連結する前に、筒状継手部と軸状継手部の何れか一方に補助並設継手部材を取付けておく構成のものであっても良い。
つまり、補助並設継手部材を機械的に取付ける構成を採用したことによって、取付けに際して熱が発生することがなく、溶接により取付ける構成のもののように、熱歪みによって筒状継手部や軸状継手部に備えた連結機構が変形してしまうのを防止することができるから、前記両継手部の何れか一方に補助並設継手部材を取付けておくことが可能となる。そのため、工場等で予め補助並設継手部材を取付けておくことができ、現場での並設継手部材間を連続させるのに要する手間を軽減することができるようになる。
【図面の簡単な説明】
【図１】本発明に係る鋼管を示す分解説明斜視図
【図２】本発明に係る鋼管の接続状態を示す斜視図
【図３】連結機構を示す要部拡大断面説明図であり、（イ）は連結前、（ロ）は連結後を示す。
【図４】鋼管の並設状態を示す横断平面図
【図５】鋼管の並設状態を示す平面図
【図６】鋼管の埋設手順を示す工程図
【図７】別実施形態の補助並設継手部材を示す取付け説明図
【図８】別実施形態の補助並設継手部材を示す取付け説明図
【図９】別実施形態の補助並設継手部材を示す要部拡大斜視図
【図１０】別実施形態の補助並設継手部材を示す取付け説明図
【図１１】別実施形態の補助並設継手部材を示す取付け説明図
【図１２】別実施形態の補助並設継手部材を示す取付け説明図
【図１３】従来例の鋼管を示す分解説明斜視図
【符号の説明】
１鋼管
２鋼管本体
３並設継手部材
６連結機構
７筒状継手部
８軸状継手部
９補助並設継手部材
１０ボルト孔
１１ボルト
１４内向き溝部
１５外向き溝部
１６ボルト孔
１７操作ボルト
２０ネジ軸体
２０ａネジ軸体端部
２２キー部材
２５内嵌突出部
２７ナット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel pipe connection structure and a steel pipe and a steel pipe connection joint used in, for example, a steel pipe column row earth retaining method and a steel pipe pile, and more specifically, a parallel joint member between steel pipe bodies arranged in parallel in the radial direction is connected to the steel pipe. The present invention relates to a steel pipe connection structure, a steel pipe, and a steel pipe connection joint in which a steel pipe is formed by welding along the longitudinal direction of the outer surface of a main body, and a plurality of the steel pipes are connected in the longitudinal direction.
[0002]
[Prior art]
Conventionally, in order to use a steel pipe as a steel pipe column retaining wall or a steel pipe pile, it is necessary to guide and bond each other along the longitudinal direction of adjacent steel pipes when embedding. A steel pipe provided with a parallel joint member for guide coupling is used.
Further, in order to set a steel pipe of a predetermined length, these steel pipes have a predetermined length by welding a plurality of fixed-length steel pipes adjacent to each other in the longitudinal direction, butting the ends of the steel pipes, and welding the joints. In this welding operation, the upper steel pipe is suspended by a crane against the lower steel pipe inserted into the buried hole, the ends of each steel pipe are butted, and the butted parts are welded and connected by human operation. Met.
[0003]
[Problems to be solved by the invention]
However, in order to butt pipe ends of multiple standard steel pipes in the longitudinal direction at the construction site and to connect and connect the butt joints with each other, the pipe ends are accurately aligned and welded with precision while butting. Since there is a need to perform work, the connecting and connecting work has been difficult.
In addition, when performing the welding work manually, a skilled welder is required, the quality of the welded part is easily affected by the weather, and it is cumbersome and expensive to use fittings such as a backing ring accompanying welding. In addition, it requires a lot of work.
In particular, since it is on-site welding, it requires more skill and labor due to problems such as scaffolding, and the work requires much time.
At this time, in the steel pipe in which the side-by-side joint member is provided on the outer surface, as shown in FIG. 13, the side-by-side joint member 3 is longer than the welded portion of the butt end of the steel pipe 1 so as not to interfere with the welding operation. It is manufactured in a structure that is attached except for a range extending inward in the direction (about 300 mm).
If the side-by-side joint member 3 is not continuous, when the other side-by-side joint member 3 is engaged and guided, there is a possibility that the part will be caught and cannot be guided. After the pipe ends are connected by welding, an auxiliary parallel joint member 9 prepared separately is inserted between the parallel joint members 3 of both steel pipes 1, so that the opposing parallel joint member 3 is inserted. On the other hand, since the operation | work which continues between the said parallel joint members 3 by the welding which aligns with respect to it is required, a lot of labor was required.
Therefore, in order to easily and accurately connect the pipe ends to each other, for example, a tubular joint portion and a shaft-like joint portion provided with a mechanically coupled connection mechanism are connected to the pipe end portion of the steel pipe. However, in the case of a steel pipe in which a parallel joint member is provided on the outer surface, the parallel joint member is provided on the outer surface of the shaft joint portion and the tubular joint portion. When the welding connection is made, the connecting mechanism provided in the cylindrical joint part or the shaft joint part may be deformed due to thermal distortion caused by welding, and the joint part may not be connected. After removing the joint member located at the joint part and mechanically connecting the tubular joint part and the shaft joint part at the construction site, the steel pipes are aligned between the joint members while aligning the steel pipes. Auxiliary parallel joint members are inserted and welded, and the parallel joint members are continuous. In addition to requiring a skilled welder, the quality of the welded part is easily affected by the weather, and not only is it cumbersome and expensive to use fittings such as a backing ring that accompanies welding. , It took a lot of work.
[0004]
Therefore, the object of the present invention is to solve the above-mentioned problems, easily connect the pipe ends to each other easily and accurately, and provide an auxiliary parallel joint member between the parallel joint members of both steel pipes. The present invention is to provide a steel pipe, a steel pipe connection structure, and a steel pipe connection joint that can reduce the labor required for mounting and connecting the parallel joint members.
[0005]
[Means for Solving the Problems]
〔Constitution〕
As shown in FIGS. 1 and 2, the characteristic configuration of the first aspect of the invention is that the juxtaposed joint members 3 of the steel pipe main bodies 2 juxtaposed in the radial direction are arranged along the longitudinal direction on the outer surface of the steel pipe main body 2. Are welded to form a steel pipe 1, and a plurality of the steel pipes 1 are connected in the longitudinal direction thereof, and are fitted to each other at the ends of the steel pipe body 2 adjacent in the longitudinal direction. A pair of matching tubular joint portions 7 and a shaft joint portion 8 are provided separately, and the coupling mechanism 6 in which the tubular joint portion and the shaft joint portion that are fitted to each other are mechanically connected to each other is connected to the both joints. Provided in the portions 7 and 8, auxiliary parallel lines are provided so as to be continuous with the juxtaposed joint members 3 adjacent to each other in the longitudinal direction at a portion where the tubular joint portion 7 and the shaft joint portion 8 are connected in the steel pipe 1. The joint member 3 is mechanically attached.
[0006]
As shown in FIGS. 1, 2, and 4, the characteristic configuration of the invention of claim 2 connects the auxiliary joint member 9 to the cylindrical joint portion 7 and the shaft-like joint portion 8 in the steel pipe 1. The part is provided with an insertion hole 12 for inserting an attachment member for mechanically attaching the auxiliary parallel joint member 9 so as to be continuous with each of the parallel joint members 3 adjacent in the longitudinal direction.
[0007]
The characteristic configuration of the invention of claim 3 is as shown in FIGS. 7 to 9, when the auxiliary joint member 9 is interposed between the juxtaposed joint members 3 adjacent to each other in the longitudinal direction. 3 is provided with an internal fitting protrusion 25 for internal fitting engagement.
[0008]
The characteristic configuration of the invention of claim 4 is as shown in FIG. 10, wherein the coupling mechanism 6 is formed with an inward groove portion 14 along the circumferential direction on the inner peripheral surface of the cylindrical joint portion 7, and the shaft-like joint. A pair of steel pipes 1 can be connected in a retaining state by forming an outward groove portion 15 along the circumferential direction on the outer peripheral surface of the portion 8 and fitting it in between the inward groove portion 14 and the outward groove portion 15. A key member 22 is provided, and a bolt hole 16 that opens to the outer peripheral surface of the cylindrical joint portion 7 and communicates with the inward groove portion 14 and an operation of withdrawing and retracting the key member 22 by screwing through the bolt hole 16 are provided. A possible operation bolt 17 is provided, and the operation bolt 17 is screwed into the bolt hole 16 in a state where the cylindrical joint portion 7 and the shaft-shaped joint portion 8 are fitted to each other. Operate the key member 22 so as to straddle the groove 15 The pair of steel pipes 1 are connected to each other in the longitudinal direction, a mounting member for mechanically mounting the auxiliary parallel joint member 9 is formed by a mounting bolt 26, and the bolt hole 16 is formed by the mounting bolt. 26 is also used as a mounting hole.
[0009]
The characteristic configuration of the invention of claim 5 is as shown in FIG. 11, wherein the operation bolt 17 is formed by a screw shaft body, and the inward groove portion 14 is formed by screwing the operation bolt 17 into the bolt hole 16. In a state where the key member 22 is straddled across the outward groove portion 15, the screw shaft body end portion of the operation bolt 17 is formed to protrude outward from the outer peripheral surface of the cylindrical joint portion 7, An insertion hole 12 provided in the auxiliary parallel joint member 9 is inserted into the end portion of the screw shaft body, and the auxiliary parallel joint member 9 is fixed by tightening a nut 27 with respect to the end portion of the screw shaft body. is there.
[0010]
The characteristic configuration of the invention of claim 6 is, as illustrated in FIG. 12, when the auxiliary parallel joint member 3 is mechanically attached so as to be continuous with the adjacent parallel joint members 3. 9 is connected and fixed to the juxtaposed joint member 3.
[0011]
According to the seventh aspect of the present invention, the steel pipe main bodies are arranged in parallel in the radial direction, and the joint members are attached to the outer surface of the steel pipe main body by welding along the longitudinal direction thereof. A plurality of steel pipes configured to be connectable and connectable in the longitudinal direction thereof, and at least the cylindrical shape of a cylindrical joint portion and a shaft joint portion provided with a coupling mechanism that can be fitted and mechanically connected to each other A joint portion is provided at the end of the steel pipe main body, and an attachment portion for mechanically attaching the auxiliary parallel joint member so as to be continuous with the parallel joint member is provided in the cylindrical joint portion.
[0012]
The characteristic configuration of the invention of claim 8 is that a plurality of steel pipes formed by welding parallel joint members of steel pipe main bodies arranged side by side along the longitudinal direction to the outer surface of the steel pipe main body 2 are provided. These are steel pipe connection joints that can be connected in the longitudinal direction, and are composed of a cylindrical joint part and a shaft joint part that are fitted together and mechanically connected to each other. An auxiliary parallel joint member provided so as to be continuous with the parallel joint member in a state of being connected to an end portion is provided with a mechanical connection portion that can be attached to at least one of the cylindrical joint portion and the shaft joint portion. It is in place.
[0013]
As illustrated in FIG. 10, the characteristic configuration of the invention of claim 9 is to form the connecting mechanism 6 by forming an inward groove portion 14 along the circumferential direction on the inner peripheral surface of the cylindrical joint portion 7, and An outward groove portion 15 is formed on the outer peripheral surface of the shaft-like joint portion 8 along the circumferential direction, and is fitted over the inward groove portion 14 and the outward groove portion 15 so as to prevent the pair of steel pipes 1 from coming off. A connectable key member 22 is provided, and a bolt hole 16 that opens to the outer peripheral surface of the cylindrical joint portion 7 and communicates with the inward groove portion 14, and the key member 22 is screwed through the bolt hole 16. The inward groove portion is provided by screwing the operation bolt 17 into the bolt hole 16 in a state where the operation bolt 17 that can be withdrawn and retracted is provided and the cylindrical joint portion 7 and the shaft joint portion 8 are fitted. 14 and the key part in a state straddling the outward groove 15 22, the pair of steel pipes 1 are configured to be connectable in the longitudinal direction, an attachment member for mechanically attaching the auxiliary parallel joint member 9 is formed by an attachment bolt 26, and the bolt hole 16 is The mounting bolt 26 is also used as a mounting hole.
[0014]
The characteristic configuration of the invention of claim 10 is as shown in FIG. 11, wherein the operation bolt 17 is formed by a screw shaft body 20 and the inward groove portion 14 is formed by screwing the operation bolt 17 into the bolt hole 16. In addition, the end portion of the screw shaft body of the operation bolt 17 protrudes outward from the outer peripheral surface of the tubular joint portion 7 in a state where the key member 22 is straddled across the outward groove portion 15. The insertion end 12 of the auxiliary parallel joint member 9 is inserted into the end of the screw shaft body, and the auxiliary parallel joint member 9 is fixed by tightening the nut 27 to the end of the screw shaft body. It is in.
[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]
[Action and effect]
According to the invention of claim 1, the pipe end portions can be easily and accurately connected with high accuracy, and an auxiliary parallel joint member is attached between the parallel joint members of both steel pipes. It is possible to reduce the time and effort required to continue the operation.
In other words, in the case of the conventional example, it was necessary to abut the pipe ends and weld the abutted part at the construction site, so that the abutted part is not only easily displaced in the lateral direction but also takes time for welding. However, in this case, when connecting the pipe ends, the tubular joint provided on each end of the steel pipe body and the shaft joint are fitted together, so that the position in the lateral direction is It is possible to prevent misalignment and accurately align, and since the connection is made by a mechanically connected connection mechanism provided at both joints, the pipe is compared with the conventional example that is welded. Connection between the ends becomes easy.
Moreover, the structure which mechanically attaches an auxiliary | assistant parallel joint member to the part which connects a cylindrical joint part and a shaft-shaped joint part so that it may each continue in parallel in the longitudinal direction is employ | adopted. For this reason, as in the conventional example, welding for attaching and fixing the auxiliary parallel joint members is not necessary, so that not only a skilled welder is unnecessary, but also the equipment required for welding and the labor required for welding work Can be reduced.
Furthermore, by adopting a structure that mechanically attaches auxiliary side-by-side joint members, heat is not generated at the time of installation, and a cylindrical joint part or a shaft-like joint part is caused by thermal strain as in a structure that is attached by welding. Therefore, before connecting the two joint portions, an auxiliary parallel joint member is attached to either the cylindrical joint portion or the shaft joint portion. It becomes possible to leave. Therefore, by attaching the auxiliary parallel joint member in advance at a factory or the like, it is possible to reduce the effort required to make the parallel joint members continuous in the field.
As a result, it is possible to provide a steel pipe connection structure capable of improving workability for connecting steel pipes provided with parallel joint members on the outer surface along the longitudinal direction of the steel pipe main body.
[0017]
According to the second aspect of the invention, in addition to being able to achieve the effects of the first aspect of the invention, the auxiliary parallel joint member is connected to the tubular joint portion and the shaft joint portion of the steel pipe. Easy to install.
That is, for example, the mounting member is constituted by a bolt, and a bolt hole for screwing the bolt is formed in a portion where the cylindrical joint portion and the shaft-like joint portion are connected, and the auxiliary parallel joint member is inserted through the insertion hole. By simply inserting the bolt and screwing it into the bolt hole, the auxiliary parallel joint member can be attached so as to be continuous with the adjacent parallel joint members in the longitudinal direction. is there.
As a result, it is possible to provide a steel pipe connection structure that can improve the workability for attaching the auxiliary parallel joint member to the portion where the cylindrical joint portion and the shaft joint portion are connected.
[0018]
According to the invention of claim 3, in addition to being able to achieve the operation and effect of the invention of claim 1 or 2, the auxiliary juxtaposed joint member is continuous with each of the juxtaposed joint members adjacent in the longitudinal direction. Can be installed without misalignment.
That is, for example, if the auxiliary parallel joint member is displaced with respect to the parallel joint member when the auxiliary parallel joint member is attached between the parallel joint members, a plurality of steel pipes are radially arranged. In order to arrange in parallel, when guiding along the longitudinal direction through each other's juxtaposed joint members, there is a possibility that it becomes impossible to guide due to being caught at the position of the misalignment. When an auxiliary parallel joint member is interposed between adjacent parallel joint members in the direction, the internal fitting protrusions provided in the auxiliary parallel joint member are internally fitted in the parallel joint member. Therefore, it is possible to easily align the auxiliary parallel joint members with respect to each other and to prevent a lateral displacement, so that it is possible to continue between the parallel joint members without positional deviation.
As a result, it is possible to improve the mounting accuracy when interposing the auxiliary juxtaposed joint member between the juxtaposed joint members, and to provide a steel pipe connection structure capable of preventing catching due to displacement.
[0019]
According to the invention of claim 4, in addition to being able to achieve the operational effects of the inventions of claims 1 to 3, it is possible to easily connect the pipe end portions accurately and accurately, and to provide auxiliary parallel arrangement. Mounting holes for mounting the joint member can be reduced.
In other words, when connecting the pipe ends, the cylindrical joint provided at each end of the steel pipe main body and the shaft joint are fitted together, so that it is possible to prevent lateral misalignment and accurately align. In addition, the pipes are connected and connected by the connecting mechanism in which the key member is fitted over the inward groove part and the outward groove part provided in both joint parts. Connection between the ends becomes easy.
In addition, since the bolt hole that allows the key member to be retracted and retracted by screwing the operation bolt is also used as the bolt hole of the auxiliary parallel joint member mounting bolt, a separate auxiliary parallel joint member mounting bolt hole is provided. Since it becomes unnecessary, the bolt hole provided in a steel pipe can be reduced.
As a result, it is possible to improve workability for connecting the steel pipes provided on the outer surface with the side-by-side joint members along the longitudinal direction of the steel pipe main body, and the bolt holes provided in the steel pipe can be reduced. The steel pipe connection structure which can suppress the strength fall of the steel pipe by the increase in a part can be provided now.
[0020]
According to the invention of claim 5, the claim Item 4 In addition to being able to achieve the effects of the present invention, it is possible to easily connect the pipe ends to each other easily and accurately, and to reduce the number of mounting holes for mounting the auxiliary parallel joint members. it can.
In other words, when connecting the pipe ends, the cylindrical joint provided at each end of the steel pipe main body and the shaft joint are fitted together, so that it is possible to prevent lateral misalignment and accurately align. In addition, it is connected by a connecting mechanism that fits the key member between the inward groove part and the outward groove part provided in both joint parts. Thus, the pipe ends can be easily connected.
In addition, the operation bolt is formed by a screw shaft body, and the screw shaft of the operation bolt is in a state where the key member is straddled between the inward groove portion and the outward groove portion by screwing the operation bolt into the bolt hole. The body end is formed so as to protrude outward from the outer peripheral surface of the cylindrical joint, and the insertion hole provided in the auxiliary parallel joint member is inserted into the end of the screw shaft body. Since the auxiliary parallel joint member is fixed by tightening, it is not necessary to separately provide bolt holes for attaching the auxiliary parallel joint member, and not only can the bolt holes provided in the steel pipe be reduced, but also the auxiliary parallel joint by tightening the nut. Until the member is fixed, the auxiliary parallel joint member can be held by hooking the insertion hole to the end of the screw shaft body.
As a result, it is possible to improve the workability for connecting the steel pipes provided on the outer surface with the parallel joint members along the longitudinal direction of the steel pipe body, and improve the workability of the auxiliary parallel joint member mounting work. Since the number of bolt holes provided in the steel pipe can be reduced, it is possible to provide a steel pipe connection structure that can suppress a reduction in strength of the steel pipe due to an increase in the number of defective parts.
[0021]
According to the sixth aspect of the invention, in addition to being able to achieve the effects of the first to fourth aspects of the invention, for example, an auxiliary parallel joint member having a deep depth in the steel pipe radial direction can be easily mounted. It becomes.
That is, for example, when forming a steel tube column row retaining wall that is arranged side by side with a large interval between steel pipes, a parallel joint member that guides and engages steel pipes that are adjacent to each other in the radial direction is arranged in the radial direction of the steel pipe. Deep depth is used.
For this reason, auxiliary parallel joint members that are attached so as to be continuous with the adjacent parallel joint members in the longitudinal direction are also used in the same way as those having a deep depth in the radial direction. When it is going to be fixed to a steel pipe with a mounting tool such as a bolt from the direction, a long operating tool for operating the mounting tool is required, and the mounting work tends to be difficult.
However, in the case of the present invention, since the auxiliary parallel joint member is connected and fixed to the parallel joint members positioned vertically in the longitudinal direction, for example, above and below the auxiliary parallel joint member. The mounting bracket is extended, and the bracket is brought into contact with the upper and lower side joint members, and is fixed by mounting using bolts or other fixtures, regardless of the depth of the auxiliary side joint member. This makes it unnecessary to use a long operation tool.
As a result, even if it is an auxiliary parallel joint member having a deep depth in the steel pipe radial direction, a steel pipe connection structure capable of improving workability for continuous attachment to the parallel joint members adjacent in the longitudinal direction is provided. Now available.
[0022]
According to the seventh aspect of the present invention, the pipe end portions can be easily and accurately connected with high accuracy, and the auxiliary parallel joint member can be attached in advance to the cylindrical joint portion.
In other words, in the case of the conventional example, it was necessary to abut the pipe ends and weld the abutted part at the construction site, so that the abutted part is not only easily displaced in the lateral direction but also takes time for welding. However, in this case, when connecting the pipe ends, the tubular joint provided on each end of the steel pipe body and the shaft joint are fitted together, so that the position in the lateral direction is It is possible to prevent misalignment and accurately align, and since the connection is made by a mechanically connected connection mechanism provided at both joints, the pipe is compared with the conventional example that is welded. Connection between the ends becomes easy.
In addition, since the auxiliary parallel joint member is mechanically attached to the cylindrical joint portion so as to be continuous with the adjacent parallel joint members in the longitudinal direction, the auxiliary parallel joint member is provided as in the conventional example. As welding for mounting and fixing the joint member becomes unnecessary, not only a skilled welder is unnecessary, but also the equipment required for welding and the labor required for welding work can be reduced.
Furthermore, by adopting a configuration in which the auxiliary parallel joint member is mechanically attached to the attachment portion provided in the cylindrical joint portion, heat is not generated at the time of installation, and heat distortion is caused as in the configuration of attachment by welding. Therefore, it is possible to prevent the connecting mechanism provided in the cylindrical joint part from being deformed, so that the auxiliary parallel joint member can be attached to the attachment part provided in advance in the cylindrical joint part at a factory or the like. It becomes possible, and the effort which is required to continue between the joint members on the site can be reduced.
As a result, it is possible to provide a steel pipe capable of improving workability for connecting steel pipes provided with parallel joint members on the outer surface along the longitudinal direction of the steel pipe main body.
[0023]
According to the eighth aspect of the present invention, the pipe end portions can be easily and accurately connected with high accuracy, and an auxiliary parallel joint member is attached between the parallel joint members of the two steel pipes. It is possible to reduce the labor required to make the members continuous.
In other words, in the case of the conventional example, it was necessary to abut the pipe ends and weld the abutted part at the construction site, so that the abutted part is not only easily displaced in the lateral direction but also takes time for welding. However, in this case, when connecting the pipe ends, the tubular joint provided on each end of the steel pipe body and the shaft joint are fitted together, so that the position in the lateral direction is It is possible to prevent misalignment and accurately align, and since the connection is made by a mechanically connected connection mechanism provided at both joints, the pipe is compared with the conventional example that is welded. Connection between the ends becomes easy.
Further, the auxiliary parallel joint member is mechanically attached to at least one of the cylindrical joint portion and the shaft joint portion so as to be continuous with each of the parallel joint members adjacent in the longitudinal direction. Therefore, as in the conventional example, not only the welding for attaching and fixing the auxiliary parallel joint member becomes unnecessary, but not only a skilled welder is unnecessary, but also necessary equipment and welding work necessary for welding. Time and effort can be reduced.
Furthermore, by adopting a structure that mechanically attaches auxiliary side-by-side joint members, heat is not generated at the time of installation, and a cylindrical joint part or a shaft-like joint part is caused by thermal strain as in a structure that is attached by welding. Therefore, before connecting the two joint portions, an auxiliary parallel joint member is attached to either the cylindrical joint portion or the shaft joint portion. It becomes possible to leave. Therefore, by attaching the auxiliary parallel joint member in advance at a factory or the like, it is possible to reduce the labor required to continue the parallel joint member pipes in the field.
As a result, it has become possible to provide a steel pipe coupling joint capable of improving workability for coupling steel pipes provided with parallel joint members on the outer surface along the longitudinal direction of the steel pipe main body.
[0024]
According to the ninth aspect of the invention, in addition to being able to achieve the operational effect of the eighth aspect of the invention, it is possible to easily connect the pipe end portions easily and accurately, and to provide auxiliary parallel arrangement. Mounting holes for mounting the joint member can be reduced. In other words, when connecting the pipe ends, the cylindrical joint provided at each end of the steel pipe main body and the shaft joint are fitted together, so that it is possible to prevent lateral misalignment and accurately align. Since it is possible to connect and connect a pair of steel pipes in a retaining state by fitting the key member between the inward groove portion and the outward groove portion provided in both joint portions, Compared with the conventional example which is welded and connected at the construction site, the pipe ends can be easily connected to each other.
In addition, since the bolt hole that allows the key member to be retracted and retracted by screwing the operation bolt is also used as the bolt hole of the auxiliary parallel joint member mounting bolt, another bolt hole for attaching the auxiliary parallel joint member is provided. Since it becomes unnecessary, the bolt hole provided in a steel pipe can be reduced.
As a result, it is possible to improve workability for connecting the steel pipes provided on the outer surface with the side-by-side joint members along the longitudinal direction of the steel pipe main body, and the bolt holes provided in the steel pipe can be reduced. It has become possible to provide a steel pipe coupling joint that can suppress a decrease in strength of the steel pipe due to an increase in the number of parts.
[0025]
According to the invention of claim 10, Item 9 In addition to being able to achieve the effects of the present invention, it is possible to easily connect the pipe ends to each other easily and accurately, and to reduce the number of mounting holes for mounting the auxiliary parallel joint members. it can.
In other words, when connecting the pipe ends, the cylindrical joint provided at each end of the steel pipe main body and the shaft joint are fitted together, so that it is possible to prevent lateral misalignment and accurately align. Since it is possible to connect and connect a pair of steel pipes in a retaining state by fitting the key member between the inward groove portion and the outward groove portion provided in both joint portions, The pipe ends can be easily connected to each other as compared with the conventional example that is welded at the construction site.
In addition, the operation bolt is formed by a screw shaft body, and the screw shaft of the operation bolt is in a state where the key member is straddled between the inward groove portion and the outward groove portion by screwing the operation bolt into the bolt hole. The body end is formed so as to protrude outward from the outer peripheral surface of the cylindrical joint, and the insertion hole provided in the auxiliary parallel joint member is inserted into the end of the screw shaft body. Since the auxiliary parallel joint member is fixed by tightening, it is not necessary to separately provide bolt holes for attaching the auxiliary parallel joint member, and not only can the bolt holes provided in the steel pipe be reduced, but also the auxiliary parallel joint by tightening the nut. Until the member is fixed, the auxiliary parallel joint member can be held by hooking the insertion hole to the end of the screw shaft body.
As a result, it is possible to improve the workability for connecting the steel pipes provided on the outer surface with the parallel joint members along the longitudinal direction of the steel pipe body, and improve the workability of the auxiliary parallel joint member mounting work. Since it is possible to reduce the number of bolt holes provided in the steel pipe, it is possible to provide a steel pipe coupling joint that can suppress a reduction in the strength of the steel pipe due to an increase in the number of defects.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.
[0027]
The steel pipe 1 used for the steel pipe column row earth retaining method will be described as an object.
The steel pipe 1 has a joint member 3 between two steel pipe main bodies 2 arranged side by side in the radial direction, and is attached to the outer surface of the steel pipe main body 2 along the longitudinal direction by welding. At least one of the cylindrical joint part 7 and the shaft-like joint part 8 provided with the connection mechanism 6 to be connected to each other is provided at the end of the steel pipe main body 2, and a plurality of them can be connected and connected in the longitudinal direction.
As a specific example, as shown in FIGS. 1 and 2, a tubular joint portion 7 made of cast steel is connected to the lower end of the steel pipe body 2 by welding with its axial core coaxial with the axial core of the lower steel pipe 1B. While forming the steel pipe 1A, the shaft-shaped joint portion 8 made of cast steel is connected to the upper end of the steel pipe main body 2 by welding with the axial core of the upper steel pipe 1A being the coaxial core, and the lower steel pipe 1B is formed. The upper and lower steel pipes 1A and 1B are configured to be freely connected by connecting the cylindrical joint part 7 of the upper steel pipe 1A to the shaft-like joint part 8 of the lower steel pipe 1B.
[0028]
As shown in FIG. 3, the cylindrical joint portion 7 has an outer diameter that is the same as the outer diameter of the upper and lower steel pipe main bodies 2, and the inner portion has an upper portion that is a base end portion facing inward. The annular engagement recess 13 is provided in the bulging portion, and the inner diameter is configured to be the same as the inner diameter of the upper and lower steel pipe main bodies 2 below the bulging portion, On the inner circumferential surface, two annular inward groove portions 14 that open inward are provided in the vertical direction along the circumferential direction.
The cylindrical joint portion 7 has a plurality of bolt holes 16 that open to the outer peripheral surface of the cylindrical joint portion 7 along the two upper and lower inward groove portions 14 and communicate with each inward groove portion 14. A large-diameter threaded portion 17 a of a set bolt 17 as an example of an operation bolt is configured to be screwable into each bolt hole 16, and the outer peripheral portion of the lower end surface of the cylindrical joint portion 7 An annular engagement step 18 is provided.
[0029]
The outer diameter of the shaft-shaped joint portion 8 is slightly smaller than the inner diameter of the cylindrical joint portion 7 so that the shaft-shaped joint portion 8 can be fitted into the cylindrical joint portion 7 of the upper steel pipe 1A. An annular engagement convex portion 19 that engages with the engagement concave portion 13 of the cylindrical joint portion 7 is provided, and is opposed to the proximal end side of the shaft-shaped joint portion 8, that is, the lower end surface of the cylindrical joint portion 7. On the lower side of the step surface, the outer diameter is configured to be the same as the outer diameter of the upper and lower steel pipes 1A, 1B.
Further, the outer circumferential surface of the shaft-like joint portion 8 is provided with two annular outward groove portions 15 that open outwardly in the circumferential direction, and the outer circumferential surface of the end surface has an annular engagement. A mating protrusion 21 is provided, and this shaft-like joint portion 8 is fitted into the tubular joint portion 7 of the upper steel pipe 1A, and the engagement protrusion 19 is engaged with the engagement recess 13 and the engagement protrusion 21 is engaged. In an engaged state with the stepped portion 18, the inward groove portion 14 on the cylindrical joint portion 7 side and the outward groove portion 15 on the shaft joint portion 8 side are positioned to face each other, and between the groove portions 14, 15. A coupling mechanism 6 is provided that is mechanically coupled to each other in a retaining state by the key member 22 being fitted over the bridge.
[0030]
As shown in FIG. 4, the key member 22 is divided into a plurality of, in this embodiment, six in the longitudinal direction of both the groove portions 14 and 15, so as to correspond to the number of arc-shaped divided key members 23. The number of the bolt holes 16 is determined, and the plurality of bolt holes 16 are arranged at equal intervals around the cylindrical joint portion 7, and a set bolt 17 is provided at the center in the longitudinal direction of each divided key member 23. A bolt hole 24 into which the small-diameter screw portion 17b is screwed is provided.
The large-diameter screw portion 17a and the small-diameter screw portion 17b of the set bolt 17 are composed of screws in opposite directions, and are therefore provided in the bolt hole 16 provided in the cylindrical joint portion and each divided key member 23. The bolt hole 24 is also composed of screws in opposite directions.
[0031]
In order to connect the steel pipes 1 having such a configuration to each other, as shown in FIG. 3 (a), the lower steel pipe 1B is formed in a state where each divided key member 23 is retracted into the inward groove portion 14 of the cylindrical joint portion 7. The cylindrical joint portion 7 of the upper steel pipe 1A is externally fitted to the shaft-shaped joint portion 8. Then, when the engagement concave portion 13 and the engagement step portion 18 on the cylindrical joint portion 7 side and the engagement convex portion 19 and the engagement protrusion 21 of the shaft joint portion 8 are engaged with each other, the cylindrical joint portion 7 side The two inward groove portions 14 and the two outward groove portions 15 on the shaft-like joint portion 8 side are positioned to face each other.
In this state, each set bolt 17 is operated from the outside of the cylindrical joint portion 7 and is rotated in a direction in which the large-diameter screw portion 17 a is screwed into the bolt hole 16 of the cylindrical joint portion 7. Then, at the same time that the large-diameter screw portion 17a is screwed into the bolt hole 16, the split key member 23 moves in a direction to be detached from the small-diameter screw portion 17b, and each split key member 23 is as shown in FIG. Are fitted over the inward groove portion 14 of the tubular joint portion 7 and the outward groove portion 15 of the shaft joint portion 8, and the steel pipes 1 </ b> A and 1 </ b> B are connected in a retaining state.
[0032]
As shown in FIGS. 1, 2, and 5, the juxtaposed joint member 3 includes a male member 4 having an O-shaped section and a female member 5 having a C-shaped section, which are provided in a pair in the longitudinal direction of the outer surface of the steel pipe body 2. It is attached and fixed to the outer surface of the steel pipe body 2 by welding along its longitudinal direction.
However, when the juxtaposed joint member 3 is attached and fixed to the outer surface of the steel pipe body 2 by welding, the connecting mechanism 6 provided in the tubular joint portion 7 and the shaft joint portion 8 is deformed by thermal strain due to welding. Since the joint portions 7 and 8 may not be connected to each other, the side-by-side joint member 3 located at the cylindrical joint portion 7 and the shaft joint portion 8 is removed.
And after fitting the cylindrical joint part 7 and the shaft-shaped joint part 8 which were provided in each edge part of the steel pipe main body 2, and connecting and connecting by the connection mechanism 6, the cylindrical joint part 7, the shaft-shaped joint part 8, and The auxiliary juxtaposed joint members 9 are attached to the connecting portions of the joint joint members 9 so as to be continuous with the juxtaposed joint members 3 adjacent in the longitudinal direction via the bolts 11.
[0033]
The auxiliary joint member 9 includes a male joint member 9a and a female joint member 9b formed in shapes corresponding to the male member 4 and the female member 5, respectively. As shown in FIGS. A bolt 11 (an example of a mounting member) that can be attached to a bolt hole 10 provided in the joint 7 and the shaft-like joint 8 is provided, and an insertion hole 12 for insertion is provided to the bolt hole 10 through the insertion hole 12. By the screwing operation of the bolts 11, the auxiliary parallel joint members 9 can be attached so as to be continuous with the parallel joint members 3 adjacent in the longitudinal direction.
In order to arrange the steel pipes 1 in parallel in the pipe radial direction as the steel pipe column retaining wall, the other female member 5 is fitted and engaged with one male member 4 attached and fixed to each of the steel pipe main bodies 2 and adjacent to each other. It guides along the longitudinal direction of the steel pipe 1, and is set.
[0034]
Next, the process of connecting and connecting in the longitudinal direction via the connecting mechanism 6 and arranging a plurality of steel pipes 1 having a predetermined length in the soil to form steel pipe column row retaining walls will be described.
1) First, as shown in FIG. 6 (a), the vertical hole 26 is drilled by the auger screw 25 at the place where the first steel pipe 1 is built, and the soil cement 27 is injected from the tip of the auger screw 25 and stirred. .
2) Next, as shown in FIG. 6B, the steel pipe 1 connected and connected to a predetermined length is inserted into the vertical hole 26 through a crane and built.
3) As shown in FIG. 6 (c), a stabilizer 28 (female member 5) attached and fixed to an auger screw 25 on a male member 4 which is one side-by-side joint member 3 of a steel pipe 1 built in a vertical hole 26. 1) is engaged, the auger screw 25 is guided along the longitudinal direction of the steel pipe 1, and a place where the steel pipe 1 to be arranged next is drilled, and the soil cement 27 is inserted from the tip of the auger screw 25. Pour and stir.
4) After lifting the auger screw 25, as shown in FIGS. 6 (d) and 6 (e), the female member 5, which is the other side-by-side joint member 3 of the steel pipe 1 to be built next, The steel pipe 1 is built and arranged in parallel through a crane while being engaged and guided to the male member 4 of the built steel pipe 1.
Thereafter, the steps 3) and 4) are repeated as many times as necessary to form a steel pipe column row retaining wall.
[0035]
[Another embodiment]
Other embodiments will be described below.
[0036]
<1> The shape of the auxiliary juxtaposed joint member is an internally fitted protrusion that fits in the juxtaposed joint member when the auxiliary juxtaposed joint member is interposed between the juxtaposed joint members adjacent in the longitudinal direction. May be provided.
Then, when interposing the auxiliary parallel joint member between the parallel joint members adjacent in the longitudinal direction, by internally fitting the internal fitting protrusion provided in the auxiliary parallel joint member, Since it is easy to align the auxiliary parallel joint member with the parallel joint member and it is possible to prevent lateral displacement, the parallel joint members can be connected without any positional deviation. When guiding along the longitudinal direction through the joint member, it is possible to prevent catching due to displacement.
[0037]
As shown in FIG. 7, the auxiliary juxtaposed joint member 9 is attached such that the inner fitting protrusions 25 provided on the upper and lower sides of the auxiliary juxtaposed joint member 9 are configured to be retractable by springs 30. The auxiliary juxtaposed joint member 9, which has been slid inwardly, is positioned between the juxtaposed joint members 3 so that the upper and lower inner fitting protrusions 25 project from the auxiliary juxtaposed joint member 3, After fitting and fitting in the joint member 3, it is mounted and fixed by screwing the mounting bolt 11 through the bolt insertion hole 12, or as shown in FIG. The inner fitting protruding portion 25a is formed longer than the lower inner fitting protruding portion 25b, and the upper inner fitting protruding portion 25a is first inserted into the juxtaposed joint member 3 at the time of mounting, and slides downward. The lower inner fitting protrusion 25b is fitted into the side-by-side joint member 3 located below by movement. After engaged, by screwing mounting bolts 11 through the bolt insertion hole 12 may be configured to attach fixed.
Further, the shape of the internal fitting protrusion 25 is a columnar shape as shown in FIG. 9 (a) or a shape in which a pair of plate members are assembled in a cross shape as shown in FIG. 9 (b). It may be.
In short, the shape is arbitrary as long as it is a shape that can be fitted into the side-by-side joint member.
[0038]
<2> The bolt hole for attaching the auxiliary parallel joint member is not limited to a structure newly provided in the cylindrical joint portion and the shaft joint portion, and the key member is retracted and retracted by screwing the operation bolt. A structure in which the operable bolt hole is also used as the bolt hole of the auxiliary parallel joint member mounting bolt may be used.
As shown in FIG. 10, a specific example when the bolt hole is also used is provided with a mounting bolt 26 having a screw portion having the same diameter as the large-diameter screw portion 17 a of the set bolt 17. When each of the divided key members 23 is fitted over the inward groove portion 14 and the outward groove portion 15 and the steel pipes 1 are connected in a retaining state, the large-diameter screw portion 17a of the set bolt 17 is bolted. The auxiliary parallel joint member 9 is formed by retreating into the hole 16 and screwing the mounting bolt 26 into the bolt hole 16 which can be screwed by retraction of the large-diameter screw portion 17a into the bolt hole 16. Is fixed.
In this case, since it is possible to attach the auxiliary parallel joint member without increasing the bolt holes provided in the cylindrical joint portion and the shaft joint portion, it is not necessary to increase the defective portion due to the bolt holes. It is possible to suppress a decrease in strength at the part and the shaft-like joint part.
(Note that in the drawings, the male member 4 in the auxiliary parallel joint member 9 is described as an example, but the mounting and fixing in the female member 5 is the same, and the description thereof is omitted.)
[0039]
<3> Further, not only bolt holes but also screw shafts may be used.
Specifically, as shown in FIG. 11, each split key member 23 is fitted over the inward groove portion 14 and the outward groove portion 15 by operating the set bolt 17, and both the steel pipes 1 are kept from coming off. When connected, the end of the large-diameter screw portion 17a of the set bolt 17 is formed so as to protrude outward from the outer peripheral surface of the cylindrical joint portion 7, and the auxiliary parallel-joint joint is formed at the end of the large-diameter screw portion 17a. The auxiliary parallel joint member 9 is attached and fixed by inserting the insertion hole 12 provided in the member 9 and tightening the nut 27 to the end of the large-diameter screw portion 17a.
In this case, since it is possible to attach the auxiliary parallel joint member without increasing the bolt holes provided in the cylindrical joint part and the shaft joint part, it is not necessary to increase the defective part due to the bolt hole, so the cylindrical joint part. In addition, it is possible not only to suppress a decrease in strength in the shaft-like joint part, but also to assist by hooking an insertion hole to the end of the large-diameter screw part until the nut is tightened and the auxiliary parallel joint member is fixed. Since the juxtaposed joint member can be held, the workability of the attaching operation of the auxiliary juxtaposed joint member can be improved.
(Note that in the drawings, the male member 4 in the auxiliary parallel joint member 9 is described as an example, but the mounting and fixing in the female member 5 is the same, and the description thereof is omitted.)
[0040]
<4> The mounting of the auxiliary parallel joint member is not limited to connecting and fixing to the cylindrical joint portion and the shaft joint portion described in the previous embodiment. It may be configured to be connected and fixed to parallel joint members adjacent in the direction.
Specifically, as shown in FIG. 12, mounting brackets 28 are extended above and below the auxiliary parallel joint member 9, and the brackets 28 are brought into contact with the upper and lower parallel joint members 3. The auxiliary parallel joint member 9 is attached and fixed to the parallel joint member 3 by tightening the bolt 29 in the mounting hole 32 of the parallel joint member 3 through a bolt hole 31 (an example of an insertion hole) formed in the joint 28. .
In this case, even if the auxiliary parallel joint member deep in the radial direction of the steel pipe is adopted, the auxiliary parallel joint member having a deep depth is connected to the tubular joint portion or the shaft joint portion from the radial direction with a fixture such as a bolt. Compared with the one that is attached and fixed, a long operating tool for operating the mounting tool is not necessary, and the mounting work can be easily performed.
[0041]
<5> In the previous embodiment, the tubular joint portion provided at each end of the steel pipe body and the shaft-like joint portion are fitted and connected by a connecting mechanism, and then connected to the parallel joint members. The configuration for attaching the auxiliary parallel joint member has been described. For example, before connecting the two joint portions, the auxiliary parallel joint member is attached to either the cylindrical joint portion or the shaft joint portion. It may be a thing.
In other words, by adopting a structure that mechanically attaches auxiliary parallel joint members, heat is not generated during the installation, and a cylindrical joint part or a shaft joint part is caused by thermal strain as in a structure that is attached by welding. It is possible to prevent the connecting mechanism provided in the above from being deformed, and therefore it is possible to attach an auxiliary parallel joint member to either one of the two joint parts. Therefore, the auxiliary parallel joint member can be attached in advance at a factory or the like, and the labor required to make the parallel joint members continuous in the field can be reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a steel pipe according to the present invention.
FIG. 2 is a perspective view showing a connection state of steel pipes according to the present invention.
FIGS. 3A and 3B are enlarged cross-sectional explanatory views showing a main part of the connection mechanism, where FIG. 3A shows before connection, and FIG.
FIG. 4 is a cross-sectional plan view showing a state in which steel pipes are juxtaposed.
FIG. 5 is a plan view showing the juxtaposed state of steel pipes
FIG. 6 is a process diagram showing the procedure for embedding steel pipes.
FIG. 7 is a mounting explanatory view showing an auxiliary parallel joint member of another embodiment.
FIG. 8 is a mounting explanatory view showing an auxiliary parallel joint member according to another embodiment;
FIG. 9 is an enlarged perspective view of a main part showing an auxiliary parallel joint member according to another embodiment.
FIG. 10 is a mounting explanatory view showing an auxiliary parallel joint member of another embodiment.
FIG. 11 is an explanatory view of installation showing an auxiliary parallel joint member according to another embodiment;
FIG. 12 is an explanatory view of attachment showing an auxiliary parallel joint member according to another embodiment;
FIG. 13 is an exploded perspective view showing a conventional steel pipe.
[Explanation of symbols]
1 Steel pipe
2 Steel pipe body
3 Parallel joint members
6 Linking mechanism
7 Tubular joint
8 Shaft joint
9 Auxiliary parallel joint members
10 Bolt hole
11 volts
14 Inward groove
15 outward groove
16 bolt holes
17 Operation bolt
20 Screw shaft
20a Screw shaft end
22 Key members
25 Internal fitting protrusion
27 nuts

Claims

A steel pipe body is welded along the longitudinal direction of parallel joint members between steel pipe bodies arranged in parallel in the radial direction along the longitudinal direction of the steel pipe body, and a plurality of the steel pipes are connected in the longitudinal direction. A steel pipe connection structure, wherein a pair of cylindrical joint portions and a shaft joint portion, which are fitted to each other, are provided on each end portion of the steel pipe main body adjacent to each other in the longitudinal direction. A connecting mechanism for mechanically connecting the tubular joint portion and the shaft-like joint portion is provided in the joint portions, and a portion of the steel pipe where the tubular joint portion and the shaft-like joint portion are connected to each other in the longitudinal direction. A steel pipe connection structure in which auxiliary side-by-side joint members are mechanically attached so as to be continuous with the adjacent side-by-side joint members.

The auxiliary side-by-side joint member is connected to the side-by-side joint member adjacent to the auxiliary side-by-side joint member in the longitudinal direction at a portion where the tubular joint portion and the shaft-like joint portion of the steel pipe are connected. The steel pipe connection structure according to claim 1, wherein an insertion hole for inserting the attachment member for mechanically attaching the member is provided.

The internal fitting protrusion part which carries out an internal fitting engagement in the said parallel joint member when the said auxiliary parallel joint member is interposed between the said parallel joint members adjacent in a longitudinal direction is provided. Steel pipe connection structure described in 1.

The connecting mechanism is formed with an inward groove portion along the circumferential direction on the inner peripheral surface of the cylindrical joint portion, and with an outward groove portion along the circumferential direction on the outer peripheral surface of the shaft joint portion, A key member capable of connecting the pair of steel pipes in a retaining state is provided by being fitted across the facing groove portion and the outward groove portion, and opens to the outer peripheral surface of the cylindrical joint portion and communicates with the inward groove portion. A bolt hole and an operation bolt that can be operated to be withdrawn and retracted by screwing through the bolt hole are provided, and the cylindrical joint portion and the shaft-like joint portion are fitted to the bolt hole in a state of being fitted. The operation bolt is screwed to operate the key member so as to straddle the inward groove portion and the outward groove portion to connect the pair of steel pipes in the longitudinal direction, and the auxiliary parallel joint member is mechanically connected. The mounting member for mounting to the Formed, the steel pipe connection structure according to claims 1 to 3, the bolt holes, are also used as a mounting hole of the mounting bolt.

The operation bolt is formed by a screw shaft body, and the operation bolt is straddled across the inward groove portion and the outward groove portion by screwing the operation bolt into the bolt hole. The screw shaft body end portion protrudes outward from the outer peripheral surface of the cylindrical joint portion, and the screw shaft body end portion is inserted through an insertion hole provided in the auxiliary parallel joint member, and the screw The steel pipe connection structure according to claim 4 , wherein the auxiliary parallel joint member is fixed by tightening a nut with respect to an end portion of the shaft body.

5. The auxiliary parallel joint member is connected and fixed to the parallel joint member when the auxiliary parallel joint member is mechanically attached so as to be continuous with the adjacent joint members adjacent to each other. Steel pipe connection structure as described.

The joint members of the steel pipe main bodies arranged in parallel in the radial direction are attached to the outer surface of the steel pipe main body by welding along the longitudinal direction, and a plurality of the steel pipe main bodies can be connected and connected in the longitudinal direction. It is a configured steel pipe, and at least the cylindrical joint portion of the tubular joint portion and the shaft joint portion provided with a coupling mechanism that is mechanically connected to each other can be fitted to the end portion of the steel pipe body. A steel pipe in which an attachment portion for mechanically attaching an auxiliary parallel joint member so as to be continuous with the parallel joint member is provided in the cylindrical joint portion.

A steel pipe coupling joint capable of connecting a plurality of steel pipes formed by welding parallel joint members of steel pipe main bodies arranged in parallel in the radial direction along the longitudinal direction of the outer surface of the steel pipe main body. The parallel joint is composed of a cylindrical joint portion and a shaft-like joint portion that are fitted to each other and mechanically connected to each other, and are connected to the end of the steel pipe body. A steel pipe coupling joint in which an auxiliary parallel coupling member provided so as to be continuous with the member is provided with a mechanical coupling portion that can be attached to at least one of the cylindrical coupling portion and the shaft coupling portion.

To constitute the coupling mechanism, an inward groove portion along the circumferential direction is formed on the inner peripheral surface of the cylindrical joint portion, and an outward groove portion along the circumferential direction is formed on the outer peripheral surface of the shaft joint portion. A key member that can be connected to the pair of steel pipes in a retaining state by being fitted over the inward groove portion and the outward groove portion, and opens to the outer peripheral surface of the cylindrical joint portion, and the inward groove portion A bolt hole that communicates with the bolt member, and an operation bolt that can be operated to retract the key member by screwing in through the bolt hole, and the tubular joint portion and the shaft-like joint portion are fitted in the state described above. A pair of the steel pipes are configured to be freely connectable in the longitudinal direction by operating the key member so as to straddle the inward groove portion and the outward groove portion by screwing the operation bolt into the bolt hole, and the auxiliary parallel joint member. Mounting bolts for mechanical mounting More form, the bolt holes, the steel pipe connection joint according to claim 8 that is also used as a mounting hole of the mounting bolt.

The operation bolt is formed by a screw shaft body, and the operation bolt is straddled across the inward groove portion and the outward groove portion by screwing the operation bolt into the bolt hole. The screw shaft body end portion protrudes outward from the outer peripheral surface of the cylindrical joint portion, and the screw shaft body end portion is inserted through an insertion hole provided in the auxiliary parallel joint member, and the screw The steel pipe coupling joint according to claim 9 , wherein the auxiliary parallel joint member is fixed by tightening a nut with respect to an end of the shaft body.