JP4254376B2

JP4254376B2 - Joint for connection

Info

Publication number: JP4254376B2
Application number: JP2003183886A
Authority: JP
Inventors: 茂樹金尾
Original assignee: Kanaflex Corp Co Ltd
Current assignee: Kanaflex Corp Co Ltd
Priority date: 2003-06-27
Filing date: 2003-06-27
Publication date: 2009-04-15
Anticipated expiration: 2023-06-27
Also published as: JP2005020921A

Description

【０００１】
【発明の属する技術分野】
本願発明は、ハンドホールやマンホール等の接続部に凸部と凹部とが管軸芯方向で交互に位置する地中埋設管を接続するための接続用継手に関する。
【０００２】
【従来の技術】
従来の接続用継手としては、螺旋波形状のＦＥＰ管（本願で言う地中埋設管）の外側に螺合可能な内径寸法を有し、かつ、一端に接続部の外面に接当する偏平なフランジを備えた円筒状の締め付け用部材と、一端に接続部の内面に接当する平型フランジを備え、かつ、前記ＦＥＰ管の内側に螺合することにより該平型フランジと前記締め付け用部材のフランジとの共働でＦＥＰ管を接続部に内外両側から挟持固定する平型フランジ付きベルマウスとから主に構成され、前記締め付け用部材のフランジの接続部との接当面に、接続部外面とのシールを行う他、ＦＥＰ管の外面とのシールを行うために締め付け用部材の内径よりも小さな内径の中心孔を有する伸縮性のあるスポンジ状合成ゴムからなる止水層を備えさせ、前記平型フランジ付きベルマウスの平型フランジの裏側（接続部との接当部分）に止水用のパッキンを備えさせている。そして以下に示すようにして接続用継手としてＦＥＰ管を接続部に接続している。まず、接続部に接続するＦＥＰ管の先端に前記締め付け用部材をそれのフランジとは反対側端から螺進させながら外装させていく。そして、フランジがＦＥＰ管の端部よりも螺進方向上手側に位置するまで締め付け用部材を回転させることにより、ＦＥＰ管の外面に前記フランジから食み出した部分の止水層が乗り上げると同時に管径方向外方側へ押しやられることによる反力でＦＥＰ管の外面に食い込み、止水層のスポンジ状合成ゴムにてＦＥＰ管の外面とのシールを行うことができる。そしてこの外装された締め付け用部材の止水層にて止水処理された状態のＦＥＰ管を接続部の貫通孔に接続部の外部から挿入して止水層を接続部の外面に接当させた状態で、前記平型フランジ付きベルマウスを接続部の内部からＦＥＰ管の内部に螺入させることにより、接続部を平型フランジ付きベルマウスと締め付け用部材とで両側から締め付けて、ＦＥＰ管を接続部の貫通孔に２つのフランジにて内外両側から挟持固定することができるようにしている（例えば、特許文献１参照。）。
【０００３】
【特許文献１】
特開２００１−９０８８４号公報（第２−４頁、第１図）
【０００４】
【発明が解決しようとする課題】
しかしながら、２つの偏平なフランジにて挟持している接続部は、コンクリート製のものがほとんどであり、そのようなコンクリート製の接続部の内面及び外面は、成型上の精度の点から完全な平面である場合が少なく、しかも表面には凹凸が多数存在している場合が多い。また、壁の厚さは部分によって異なっていることが多く、例えば貫通孔の上側に位置する壁の厚みと下側に位置する壁の厚みとでは異なることがある。つまり、壁面の凹凸や壁の厚みの差によって、従来の接続用継手では、接続部の内面と外面のそれぞれに止水用のパッキン及び止水層を接当面全域に渡って隙間の無い状態で均一に接当させることができず、場合によっては十分な止水効果を発揮させることができないことがあった。
また、長期間の使用に伴って部材の伸びや地震などの振動を受けて、前記締め付け用部材と平型フランジ付きベルマウスによる締め付けが緩くなってしまい、前記パッキン及び止水層による止水効果が弱くなり、外部から水等が侵入するおそれもあり、改善の余地があった。
【０００５】
本願発明は、接続部の壁面の凹凸や厚みに関係することなく止水性能を十分に発揮させることができると共に、長期間にわたって所望の止水効果を持続することができる接続用継手を提供することを目的とする。
【０００６】
【課題を解決するための手段】
前記目的を達成するために、ハンドホールやマンホール等の接続部に凸部と凹部とが管軸芯方向で交互に位置する地中埋設管を接続するための接続用継手であって、前記接続部の貫通孔に挿入可能な外径寸法を有し、かつ、前記地中埋設管を内挿可能な内径寸法を有する筒状体を設け、前記筒状体の挿入方向両側に前記接続部の内面及び外面にそれぞれ接当して該筒状体を貫通孔へ挿入した状態で固定するための一対の挟持部材を備えさせ、前記挟持部材のうちの少なくとも一方を該筒状体の外面に設けられた螺子部に沿って挿入方向に螺進自在に構成し、前記筒状体の外面に、前記接続部の貫通孔の周面と接触して該筒状体の外面と該接続部の貫通孔の周面との間をシール処理するためのパッキン部材を設け、前記筒状体に内挿された地中埋設管の凹部に入り込む突出部を備えて抜け止めを行うロック部材を設け、前記地中埋設管の筒状体への挿入側先端部外面に、該筒状体への挿入に伴って筒状体とのシール処理が可能となる環状の管用パッキン部材を備えさせて接続用継手を構成した。
したがって、地中埋設管を挿入する筒状体を一対の挟持部材によって接続部の内外から挟持すると共に、ロック部材によって地中埋設管の抜け止めを行うので、接着剤などを使用することが無く、地中埋設管と接続部を短時間に固定することができる。
前記接続部の貫通孔は、ドリルなどを用いて切削して形成することになるため、その貫通孔の周面は、貫通方向どの部位においても凹凸の無いほぼフラットな面に形成することが可能になる。しかも、このように形成された貫通孔の周面と挿入された筒状体の外面との距離を貫通方向のどの部位においてもほぼ同一になっていることから、本願発明のように筒状体の外面と接続部の貫通孔の周面との間にパッキン部材を設けることによって、貫通孔の周面に対してパッキン部材の接当面をどの部位においても隙間のない密着した状態でほぼ均一に接当させることができるだけでなく、貫通方向においてパッキン部材が移動しても、該接当関係が変化することがない。従って、従来のように貫通孔付近の内面及び外面の凹凸や壁の厚みの違いに関係すること無く止水性能を十分発揮させることができる。また長時間が経過して挟持状態が弱く（緩く）なっても、該パッキン部材による止水状態が変化することがない又は少なく、十分な止水効果を得ることができる。
【０００８】
また、前記接続部の内面に一端が接当する前記挟持部材の他端に前記筒状体の内面よりも管軸芯側に延びる延出部を形成し、この延出部の管軸芯側端部に前記地中埋設管内に通線される電線やケーブルを接当案内するための湾曲面を備えさせてもよい。
【０００９】
また、前記螺子部を前記筒状体の外面に管軸芯方向に沿って所定間隔を置いて複数備えさせ、前記筒状体の管軸芯方向で隣り合う螺子部間に、前記接続部の厚みに応じて切断して前記筒状体の該接続部への挿入方向の長さを調節するための切断部を視認可能に設けて、接続部の壁の厚さに応じて筒状体の長さを調節してもよい。したがって、接続部の壁の厚さに対応した適宜の箇所で切断することができる。
【００１０】
また、前記地中埋設管が、凹部と凸部とが管軸芯方向で交互に螺旋状に形成された螺旋管でなり、前記ロック部材を、前記筒状体の径方向外側に位置する環状の外側部と、前記筒状体の内面と地中埋設管の外面との間に位置する環状の内側部と、前記外側部と内側部の前記接続部の挿入方向で同一側となる端部同士を連結する環状の連結部とからなる断面形状がほぼコの字状のロック本体と、このロック本体の外側部の周方向で所定間隔を隔てて接続部側へ延出され、かつ、前記筒状体の接続部外部側端部に径方向外側に突出させた被係止部に係止可能な複数の係止爪と、前記ロック本体の内側部の径方向内面に径方向内側へ突出して前記地中埋設管の凹部に入り込む螺旋状の前記突出部とから構成してもよい。
【００１１】
また、前記地中埋設管が、凹部と凸部とが管軸芯方向で交互に螺旋状に形成された螺旋管でなり、前記ロック部材を、前記筒状体の内面と地中埋設管の外面との間に位置する環状のロック本体と、このロック本体の周方向で所定間隔を隔てて接続部側へ延出され、かつ、前記筒状体の接続部外部側端部に径方向内側に環状の凹部からなる被係止部に開始可能な複数の係止爪と、前記ロック本体の径方向内面に径方向内側へ突出して前記地中埋設管の凹部に入り込む螺旋状の突出部と、前記ロック本体の径方向外側に突出され、かつ、前記筒状体と前記地中埋設管の間に該ロック本体全体が入り込むことを抑止する抑止部とから構成してもよい。
【００１２】
また、前記パッキン部材を入り込ませるための環状凹部を前記筒状体に備えさせてもよい。
【００１３】
【発明の実施の形態】
図１は、ハンドホールやマンホール等のコンクリート製の接続部１に形成されたほぼ円形の貫通孔（図では１個のみ示しているが、２個以上であってもよい）１Ａに接続用継手２を介して地中埋設管３を接続したものが示されている。図では、接続部１の側壁に地中埋設管３を接続したものを示しているが、底壁や天壁に接続したものであってもよい。
前記貫通孔１Ａは、ドリルなどの工具を用いて削り、削った周面に凹凸が形成されないと共に貫通方向においてほぼフラット面となるように仕上げることになる。
【００１４】
前記地中埋設管３は、可撓性及び伸縮性をある程度有するようにポリエチレン等の合成樹脂でなり、図１で示すように、半円状に突出形成された山形状の凸部３Ａと半円状に盛り下がった凹部３Ｂとが管軸芯方向において交互に位置する螺旋状に形成されたものから構成しているが、凸部３Ａ及び凹部３Ｂの形状は半円状の他、正方形、三角形状、楕円形状、台形状等、どのような形状に形成してもよい。また地中埋設管３は凸部３Ａと凹部３Ｂとが管軸芯方向において交互に環状に位置するリング状に形成されたものであってもよい。
【００１５】
前記接続用継手２の各部材は、図１から図８（ａ），（ｂ）で示すように、前記接続部１の貫通孔１Ａに挿入可能な外形寸法を有し、かつ、前記地中埋設管３を内挿可能な内径寸法を有すると共に、径方向の寸法よりも管軸芯方向の寸法が長くなっている円形の筒状体４と、この筒状体４の挿入方向両側に備えさせると共に前記筒状体４を貫通孔１Ａへ挿入した状態で固定するための一対の挟持部材５Ａ，５Ｂ（５，５）と、前記筒状体４の外面の少なくとも一部に、前記接続部１の貫通孔１Ａの周面との間をシール処理するためのパッキン部材６と、前記筒状体４に内挿された地中埋設管３の抜け止めを行うロック部材７とからなっている。このうち、前記筒状体４、挟持部材５、ロック部材７は、前記地中埋設管３と同様にポリエチレン等の合成樹脂からなっている。前記ロック部材７による地中埋設管３の抜け止めが不要である場合には、ロック部材７を省略してもよい。
【００１６】
前記筒状体４の外面には、図１及び図２で示すように、管軸芯方向（長手方向）に沿ってほぼ同一長さを有する複数の螺子部８，…，８を備えている。そして、前記一対の挟持部材５Ａ，５Ｂは、管軸芯方向両端に位置する螺子部８，８（残る螺子部は後述する）に沿って筒状体４の挿入方向に螺進自在となっており、各螺子部８の長さを変更することによって、挟持部材５Ａ，５Ｂの螺進範囲を調節することができ、接続部１の厚み変動を螺子部８でもある程度吸収することができる利点がある。また、貫通孔１Ａに貫通した状態の筒状体４の両側に螺合されている該挟持部材５Ａ，５Ｂをそれぞれ接続部側に螺進させることにより、接続部１の内部の挟持部材５Ａを壁の内面１Ｂに接当させると共に、接続部１の外部の挟持部材５Ｂを壁の外面１Ｃに接当させ、該筒状体４を接続部１に固定している。さらに、筒状体４は前記パッキン部材６を入り込ませるための環状凹部９を備えている。したがって、この環状凹部９にパッキン部材６を備えた筒状体４を接続部１の貫通孔１Ａに挿入することによって、凹部の無い筒状体４の外面に直接外装させる場合に筒状体４に対してパッキン部材６が不測に移動することを阻止することができるだけでなく、筒状体４に対する貫通孔１Ａの大きさをできる限り小さく抑えることができながらも、管径方向に厚みのあるパッキン部材を用いることが可能になり、貫通孔１Ａの周面と筒状体４の外面との間のシール性能を十分発揮させて（貫通孔１Ａの周面から径方向内側への力を受けて）、強固なシール処理を行うことができる。また、筒状体４を接続部１の外部から内部に挿入作業を行っているときには、パッキン部材６は貫通孔１Ａの周面と接当により径方向内側に向かう力を受けて前記環状凹部９に強固に入り込み、この環状凹部９から外れることがない。なお、パッキン部材６としては、吸水膨張性を有するゴムを使用すると、筒状体４の挿入作業を容易に行うことができると共に、作業終了後はより高い止水効果を得ることができる。また、前記のように管径方向内側に凹んだ凹部９を形成することによって備えられる径方向に突出する壁部９Ａが、筒状体４に挿入される地中埋設管３の挿入先端に接当して挿入深さを制限するための位置決め部に構成することができる利点がある。又、前記２つの挟持部材５Ａ，５Ｂの両方を螺進自在に構成しているが、パッキン部材６を挟んでロック部材７側に位置する挟持部材５Ｂを筒状体４の所定位置に固定したものであってもよい。この場合、筒状体４に別体形成された挟持部材５Ｂを接着剤などにより固定したり、筒状体４を成型するときに挟持部材５Ｂも一緒に成型して構成したものであってもよい。
【００１７】
また、前記筒状体４の接続部の外部側の端部には、図１で示しているように貫通孔１Ａよりも径方向外側に突出させた被係止部１０を備え、前記ロック部材７を係止可能としている。この被係止部１０は、接続部１の外部側に位置し、筒状体４に円環状に備えられている。前記貫通孔１Ａの直径よりも被係止部１０の外径が大きいことから、被係止部１０の無い端部から接続部１の貫通孔１Ａに外部側から挿入することになるが、筒状体４に対する貫通孔１Ａの大きさをできる限り小さく抑えることができ、外径の小さな挟持部材５Ａ，５Ｂにすることができるだけでなく、ガタツキ難い状態で地中埋設管３を接続することができる。
【００１８】
また、前記地中埋設管３の筒状体４への挿入側先端部３Ｃの外面には、該筒状体４への挿入に伴って筒状体４の内面とのシール処理を行う環状の管用パッキン部材１１を備えている。この管用パッキン部材１１は、吸水膨張性を有したゴムの方が、接続作業中は地中埋設管３を筒状体４に内挿しやすく、接続作業後は地中埋設管３と筒状体４との間に高い止水効果を得ることができる。又、前記管用パッキン部材１１の内面は、それを地中埋設管３に螺合することでシール処理可能になるように螺旋状の凹凸部を備えさせており、前記管用パッキン部材１１を地中埋設管３に螺合させるだけで装着させることができるようになっているが、接着剤などを用いて装着させてもよい。
【００１９】
このように、パッキン部材６によって接続部１の貫通孔１Ａの周面と筒状体４の外面との間の止水を行い、管用パッキン部材１１によって地中埋設管３の外面と筒状体４の内面との間の止水を行うことができ、接続部１の止水を確実に行うことができる。また、接続作業終了後、長期間経過して前記挟持部材５Ａ，５Ｂの挟持状態が緩くなり、パッキン部材６が貫通孔１Ａ内で移動した場合でも、パッキン部材６が貫通孔１Ａ内にあれば、その止水能力に変化はない又は殆ど無く、接続作業直後と同様の止水効果を得ることができる。同様に、管用パッキン部材１１も、挟持部材５Ａ，５Ｂによる挟持状態に関係することなく、地中埋設管３の外面と筒状体４の内面との間の止水能力が変化することは殆ど無いので、長期間経過後も、高い止水能力を持続することができる。
【００２０】
前記ロック部材７は、図１及び図３に示しているように、前記筒状体４の径方向外側に位置する円形で環状の外側部１２と、前記筒状体４の内面と地中埋設管３の外面との間に位置すると共に外側部１２よりも管軸芯方向において短い寸法を有する円形で環状の内側部１３と、前記外側部１２と前記内側部１３の前記接続部１の挿入方向で同一側となる端部同士を連結する環状の連結部１４とからなる断面形状がほぼコの字状のロック本体と、このロック本体の外側部１２の周方向で所定間隔を隔てて接続部１側へ延出され、かつ、前記筒状体４に備えられる前記被係止部１０に係止する係止爪１５と、前記ロック本体の内側部１３の径方向内面に径方向内側へ突出して地中埋設管３の凹部３Ｂに入り込む螺旋状の突出部１６とから構成されている。また、前記係止爪１５の周方向の長さ（幅）は、隣り合う係止爪１５間の長さに対して短く形成されていることから、撓み易くなっており、より小さな力で係止状態とすることができる利点があるが、同一又は長く形成してもよい。また、前記被係止部１０の筒状体４の軸芯方向外側部分はテーパ面１０Ａに形成されている。したがって、ロック部材を回転させるだけで、前記螺旋状の突出部１６は前記地中埋設管３の螺旋状の凹部３Ｂに沿って接続部側に螺進する。そして、前記係止爪１５がテーパ面１０Ａに乗り上げ、この係止爪１５が係止する管軸芯方向と直交するほぼ垂直な被係止面１０Ｂに移動して、ロック部材７をスムーズに係止させることができるようにしている。したがって、ロック部材７を回転させるだけで、ロック部材を接続部側に移動させることができ、かつ、被係止部１０のテーパ面１０Ａを利用して係止爪１５を徐々に径方向外方側へ変形させることができ、小さな操作力で係止爪１５を乗り上げさせて係止状態とすることができる。また、係止状態を解除するときには、ドライバーやバール等の工具で係止爪１５を破断することで係止状態を解除することができるが、係止爪１５の周方向の長さが他の係止爪１５との間に対して短いので、破断させやすく、係止状態を解除しやすくなっている。
【００２１】
図１及び図２で示しているように、前記筒状体４の外面には、管軸芯方向（長手方向）に沿って複数の螺子部８，８，…（少なくとも挟持部材５Ａを螺合させる螺子部８以外は省略して実施することもできる）が所定間隔を置いて連続しない状態で備えられている。前記筒状体４は、それの管軸芯方向中間部に形成した前記環状凹部９と被係止部１０が形成された側とは反対側の一端（接続部１の内部側先端）との間に備えられている螺子部８，…，８の隣り合う螺子部間に、視認可能な切断部１７（１７Ａ，１７Ｂ，１７Ｃ）を備え、接続部１の厚み（貫通孔１Ａの長さ）に応じて特定の切断部１７Ａ又は１７Ｂ又は１７Ｃを切断して、該筒状体４の挿入方向（管軸芯方向）の長さを調節することが可能になっている。そして、前記のようにどの切断部を切断して筒状体４の長さを変更した場合でも、前記貫通孔１Ａの周面の適宜の箇所にパッキン部材６を接当させてシールすることができると共に、前記一対の挟持部材５Ａ，５Ｂによって筒状体４を接続部１に固定することができるようになっている。例えば、接続部１の厚みが３０〜６５ｍｍの場合には、図７（ａ）に示すように前記環状凹部９から最も近い切断部１７Ａで切断して使用し、又接続部１の厚みが６５〜１００ｍｍの場合には、図７（ｂ）に示すように前記環状凹部９から二番目に近い切断部１７Ｂで切断して使用し、又接続部１の厚みが１００〜１３５ｍｍの場合には、図７（ｃ）に示すように前記環状凹部９から最も遠い切断部１７Ｃで切断して使用し、又接続部１の厚みが１３５〜１７０ｍｍの場合には、図１で示すように切断部１７で切断をしないでそのまま使用することになる。従って、単一（１種類）の筒状体４を使用しながらも、接続部１の厚みに合わせて切断部１７（１７Ａ，１７Ｂ，１７Ｃ）を切断することによって、４種類の寸法（長さ）の筒状体４を構成することができる。尚、前記切断部１７は、１つ又は２つあるいは４つ以上であってもよいし、場合によっては切断部１７を省略して実施することもできる。
前記切断部１７は、Ｖ字型若しくはＵ字型に形成された環状の凹部であり、その深さは切断刃が入り込んで切断がし易いように位置決めできる程度の浅い（例えば、０．９ｍｍ）深さに設定しているため、その部分における筒状体４の強度が低下するようなことがない。このように、それら凹部（切断部）１７を形成することによって、切断位置を視認可能とする他、塗料やマジックなどを用いて印すことにより切断位置を視認可能としてもよい。
【００２２】
前記挟持部材５Ａ，５Ｂ（５，５）は、図１及び図８（ａ），（ｂ）で示すように、内面に螺子部を備えた円筒状の本体の一端に接続部１の内面１Ｂに接当する円形で環状のフランジ５ａを備えた内部側挟持部材５Ａと、内面に螺子部を備えた円筒状の本体の一端に接続部１の外面１Ｃに接当する円形で環状のフランジ５ｂを備えた外部側挟持部材５Ｂとからなり、前記内部側挟持部材５Ａは、その外周面に把持部２７を備え、筒状体４に備えられている螺子部８に沿って螺進させるために内部側挟持部材５Ａを回転操作させる場合に、把持部２７が指の引っ掛かり部として利用することができ、滑ることなく内部側挟持部材５Ａを確実に回転操作することができるようにしている。また、内部側挟持部材５Ａは、管軸芯側（管径方向内方側）に延びる延出部１８を形成し、この延出部１８の管軸芯側端部に湾曲面１９を備えさせ、地中埋設管３内に通線される電線やケーブルを傷付けることなく接当案内することができるようにしてあり、内部側挟持部材５Ａをベルマウスに兼用構成することができるようにしている。
前記外部側挟持部材５Ｂは、内部側挟持部材５Ａと同様に外周面に把持部２７を備え、筒状体４を螺進させるときに外部側挟持部材５Ｂを把持し易く、回転を確実に行えるようにしている。
【００２３】
接続用継手２を用いて、地中埋設管３を接続部１に接続する手順を説明するが、説明する手順以外で行ってもよい。尚、接続部１の厚みに応じて、筒状体４の管軸芯方向（長手方向）の長さ調節が必要である場合には、前記切断部１７（１７Ａ，１７Ｂ，１７Ｃ）で切断し長さを予め調節しておくことになる。
まず、図４に示すように、筒状体４の接続部１への挿入側先端部、つまり被係止部１０から離間する側の端部から前記外部側挟持部材５Ｂを回転させながら、前記被係止部１０付近まで螺進させて外装させる。続いて、前記パッキン部材６を、前記と同様に筒状体４の接続部１への挿入側先端部から外挿しながら前記環状凹部９に挿入する。さらに、図５に示すように、接続部１の外部から貫通孔１Ａに、外部側挟持部材５Ｂ及びパッキン部材６を備えた筒状体４を挿入する。そして、貫通孔１Ａを通して内部に突出した筒状体４の挿入側先端部（内部側先端部）に前記内部側挟持部材５Ａを接続部１の内面１Ｂに接当する位置まで螺進させる。その後、図６に示すように、前記外部側挟持部材５Ｂを接続部１側に螺進させて、接続部１の外面１Ｃに接当させることにより、該接続部１を挟持部材５Ａ，５Ｂにて内外で挟持し、該筒状体４を接続部１に固定する。
そして、図６に示すように、前記地中埋設管３にそれの筒状体への挿入側先端部３Ｃから前記ロック部材７を回転させながら筒状体４へ地中埋設管３を挿入可能な位置まで外挿した後、地中埋設管３の筒状体４への挿入側先端部外面に、前記管用パッキン部材１１を前記のように備えさせる。つぎに、この管用パッキン部材１１及びロック部材７を備えた地中埋設管３を前記接続部１に固定された筒状体４に接続部１の外部から挿入する。その後、前記ロック部材７を接続部側に螺進するように回転させて、ロック部材７の係止爪１５を前記筒状体４の被係止部１０に係止させて、地中埋設管３を接続部１に抜け止め処理された状態で接続することができるのである。ここでは、螺旋状凹凸部を備えた地中埋設管３を用いた場合を示したが、環状の凹凸部を備えた地中埋設管３を用いる場合には、地中埋設管３の抜け止めのためのロック部材を例えば上下又は左右に２分割された２つの半割部材から構成し、それら２つの半割部材を地中埋設管３が内挿された筒状体４を覆うと共にそれら両部材を係止などにより連結することで地中埋設管３を筒状体４から抜けることを阻止するようにすることになる。
【００２４】
なお、図１及び図８（ａ）で示している内部側挟持部材５Ａの湾曲面１９は、筒状体４の管軸芯方向の外側に向かって突出させた突出部１９Ｔの内面に形成しているが、図９で示すように、筒状体４の管軸芯方向の内側に向かって突出させた延出部１８Ａの内面に湾曲面１９Ａを備える挟持部材５Ｃを該筒状体４に備えさせ、前記電線やケーブルなどを接当案内可能としてもよい。
また、図１及び図９では、接続部１の内部に備えられる挟持部材５Ａ，５Ｃによって、前記電線やケーブルなどを接当案内しているが、図１０に示すように、筒状体４の接続部１の内部側端部に、径方向の内側に向かってＵの字状に湾曲した凹部の内面に筒状体湾曲面２０を備えさせて、前記電線やケーブルなどを接当案内可能としてもよい。この場合、接続部１の内部で挟持する挟持部材５Ｄと接続部１の外部で挟持する挟持部材５Ｂとは、同一の挟持部材５（５Ｂ，５Ｄ）を使用することができ、部品点数の削減化を図ることができる。
【００２５】
さらに、図１１で示すように、前記パッキン部材６Ａを入り込ませる環状凹部９Ｂを径方向内側に向かってＵの字状（山型状）となる凹部に形成することによって、環状凹部９Ｂの内面を湾曲面９Ｃに形成し、この湾曲面９Ｃを電線やケーブルなどを接当案内するベルマウスとして兼用構成してもよい。なお、筒状体４の内部側端部に地中埋設管３内に通線される電線やケーブルなどが、前記筒状体４の内部側端部に接触することが無いように、接続部１の内部側の挟持部５Ｅは、その内部側端部に筒状体４よりも管軸芯側に延びる延出部２１を備え、該延出部２１の管軸芯側端部を筒状体４の管軸芯方向中央部（長手方向中央部）が頂部となる円弧状に形成して、電線やケーブルなどを傷付けることなく接当案内することができるようにしている。
【００２６】
また、図１、図９〜図１１では、前記筒状体４の外面に被係止部１０を突出させ、該被係止部１０にロック部材７を係止して、地中埋設管の抜け止めを行っているが、図１２で示すように、筒状体４Ａの管軸芯方向一端側でかつ径方向内面に環状の溝からなる被係止部２２を形成し、この被係止部２２に係止する係止爪２３を先端に備えたロック部材７Ａを、該筒状体４Ａと前記地中埋設管３の間に挿入可能で、かつ、筒状体４の内径寸法とほぼ同一の外径寸法を有する円筒状に構成し、ロック部材７Ａの係止爪２３を筒状体４の内面に備えた被係止部２２に係止させて、抜け止めを行うこともできる。図１２では、被係止部２２を筒状体４の内面に形成し、これに係止する係止爪２３をロック部材７Ａに備えさせたが、図１３に示すように被係止部２２をロック部材７Ａに備えさせ、これに係止する係止爪２３をこれに係止する係止爪２３を形成して実施することもできる。
前記ロック部材７Ａは、前記係止爪２３を先端に備えた円筒状のロック本体２４と、ロック本体２４の周方向で所定間隔を隔てて接続部側へ延出され、前記被係止部２２に係止する複数の係止爪２３と、該ロック本体２４の径方向内面に径方向内側に突出して前記地中埋設管３の凹部３Ｂに入り込む螺旋状の突出部１６と、該ロック本体２４の径方向外側に突出され、かつ前記筒状体４Ａと前記地中埋設管３との間に該ロック本体２４の全体が入り込むことを抑止する抑止部２５を備えている。なお、その他の部材などは図１で示している部材と同様の部材を使用している。図１等で示している筒状体４は、前記被係止部１０が筒状体４の外面に備えられているが、図１２及び図１３で示している筒状体４Ａは、前記被係止部２２を筒状体４Ａの内面に備えている。したがって、図１２及び図１３で示している筒状体４Ａの厚さは、図１〜図１１で示している筒状体４より厚く形成することによって、筒状体４の被係止部２２の部分における強度が大きく低下することがないようにしている。被係止部２２が内面に備えられている筒状体４Ａは、その外面に突出部分（被係止部）を備えていないので、接続部１の貫通孔１Ａに接続部１の内部側から外部側に向かって、筒状体４Ａを挿入することができる。要するに、筒状体４をどちらの端部からでも貫通孔１Ａに挿入することができ、接続作業面において有利になる。
【００２７】
なお、図１２で示しているロック部材７Ａは、接続部側の端部に前記係止爪２３を備えているが、図１３で示しているロック部材７は、テーパ状のロック本体２４と、このロック本体２４の径方向内側に地中埋設管３の凹部３Ｂに入り込む突出部１６と、該ロック本体２４の全体が筒状体４Ａの内部に入り込むのを抑止する抑止部２５と、前記被係止部２２に係止する係止部２６を備えている。
【００２８】
【発明の効果】
以上の如く、接続部の内部と外部の双方に備えられる挟持部材によって筒状体が固定されることにより、短時間で接続作業を行うことができる。しかも、凹凸面がないように削られてフラット面に形成される接続部の貫通孔の周面と接触して筒状体の外面と貫通孔の周面との間をシール処理するパッキン部材を筒状体に備えさせることによって、従来のように貫通孔の壁面で止水を行わないので、接続部の壁面の凹凸や厚みの差に関係することがなく、止水性能を十分に発揮させることができる。又、長時間経過して挟持部材による挟持が緩くなったときでも、止水効果が変化することはない又は殆ど無く、信頼性の高い接続用継手を提供することができる。
【００２９】
また、地中埋設管の筒状体への挿入側先端部外面に、筒状体と該地中埋設管間のシール処理が可能な環状の管用パッキン部材を備えているので、筒状体に地中埋設管を挿入するだけで、筒状体と地中埋設管との間の止水処理（シール処理）を行うことができる。
【００３０】
また、接続部の内部に位置する挟持部材は、内部側端末部に筒状体よりも管軸芯側に延びる延出部と、この延出部の管軸芯側端部に湾曲面を備えて、地中埋設管に通線される電線やケーブルなどを接当案内することができるので、該挟持部材が、ベルマウスと同様の効果を得ることができ、電線やケーブルなどを滑らかに曲げることができるようになり、部材点数の削減化を図ることができる。
【００３１】
また、筒状体の外面には複数の螺子部を備え、この筒状体の管軸芯方向の隣り合う螺子部間に、接続部の厚みに応じて切断可能な切断部を備えているので、接続部の厚みに応じて、筒状体の挿入方向（管軸芯方向）の長さを調節することができる。したがって、単一の筒状体を使用しながらも、接続部の厚みに合わせて切断部を切断することによって、多数の長さの筒状体を作製することができ、製造面及び在庫管理面のいずれにおいても有利になる。
【００３２】
また、地中埋設管が螺旋管の場合には、ロック部材に備えられた突出部が地中埋設管の凹部に入り込むので、ロック部材を回転させるだけの小さな力でロック部材を筒状体に容易に係止させることができる。
また、係止爪は筒状体の径方向外側に位置し、かつ、ロック部材の周方向で所定間隔を隔てて接続部側へ延出されているので、係止爪を破断することで抜け止め状態を容易に解除することができる。
【００３３】
また、係止爪が筒状体の内面と地中埋設管の外面の間に位置する場合には、筒状体の外面に被係止部を備える必要が無いので、筒状体を接続部の内部から外部に向かって挿入することができる。
【００３４】
また、筒状体にパッキン部材を入り込ませる環状凹部を備えているので、貫通孔に筒状体を挿入するときには、この環状凹部がパッキン部材を入り込ませて移動を防ぐことができると共に地中埋設管の挿入深さを規制する位置決め部材として利用することができる。
【図面の簡単な説明】
【図１】厚肉な壁を有する接続部に地中埋設管を接続用継手を介して接続した状態で、接続用継手の上半分のみを断面にした分解断面図である。
【図２】地中埋設管及び接続用継手の分解側面図である。
【図３】ロック部材の正面図である。
【図４】外部側挟持部とパッキン部材を筒状体に外挿した状態で、接続用継手の上半分のみを断面にした分解断面図である。
【図５】筒状体を接続部に挿入し、内部側挟持部材が接続部の内面に接当している状態で、接続用継手の上半分のみを断面にした分解断面図である。
【図６】接続部を挟持部材にて内外で挟持し、筒状体に地中埋設管を内挿した状態で、接続用継手の上半分のみを断面にした分解断面図である。
【図７】３種類の厚さの壁を有する接続部のそれぞれに接続用継手を介して地中埋設管を接続した状態を示した側面図である。
【図８】挟持部材を示し、（ａ）は接続部の内部に備えられる挟持部材の正面図であり、（ｂ）は接続部の外部に備えられる挟持部材の正面図である。
【図９】接続部内部側の挟持部材の別実施状態を示す、接続用継手の上半分のみを断面にした分解断面図である。
【図１０】筒状体の接続部内部側先端部に湾曲面を備えた接続用継手の上半分のみを断面にした分解断面図である。
【図１１】筒状体の環状凹部に湾曲面を備えた接続用継手の上半分のみを断面にした分解断面図である。
【図１２】筒状体の内面と地中埋設管の外面の間にロック部材が位置すると共に、係止爪がロック部材の接続部側先端に備えられている接続用継手の断面図である。
【図１３】筒状体の内面と地中埋設管の外面の間にロック部材が位置すると共に、被係止部が筒状体の接続部外側先端部に備えられているときの接続用継手の断面図である。
【符号の説明】
１接続部１Ａ貫通孔
１Ｂ内面１Ｃ外面
２接続用継手３地中埋設管
３Ａ凸部３Ｂ凹部
３Ｃ挿入側先端部
４，４Ａ筒状体
５，５Ａ，５Ｂ，５Ｃ，５Ｄ，５Ｅ挟持部材
５ａ，５ｂフランジ
６，６Ａパッキン部材
７，７Ａロック部材８螺子部
９環状凹部９Ａ壁部
９Ｂ環状凹部９Ｃ湾曲面
１０被係止部１０Ａテーパ面
１０Ｂ被係止面１１管用パッキン部材
１２外側部１３内側部
１４連結部１５係止爪
１６突出部
１７，１７Ａ，１７Ｂ，１７Ｃ切断部
１８，１８Ａ延出部
１９，１９Ａ湾曲面
１９Ｔ突出部
２０筒状体湾曲面２１延出部
２２被係止部２３係止爪
２４ロック本体２５抑止部
２６係止部２７把持部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection joint for connecting underground buried pipes in which convex parts and concave parts are alternately positioned in the axial direction of the pipe axis to connecting parts such as hand holes and manholes.
[0002]
[Prior art]
As a conventional joint for connection, it has an inner diameter dimension that can be screwed to the outside of a spiral-wave shaped FEP pipe (underground pipe referred to in the present application), and has a flat surface that comes into contact with the outer surface of the connection portion at one end. A cylindrical clamping member provided with a flange, a flat flange that contacts one end of the inner surface of the connecting portion, and the flat flange and the clamping member that are screwed into the FEP pipe It is mainly composed of a bell mouth with a flat flange that clamps and fixes the FEP pipe to the connecting part from both the inside and outside by cooperating with the flange of the connecting part, and on the contact surface with the connecting part of the flange of the fastening member, In addition to sealing with the outer surface of the FEP tube, a waterproof layer made of a stretchable sponge-like synthetic rubber having a center hole with an inner diameter smaller than the inner diameter of the fastening member is provided, Flat flanged base And let includes a packing for sealing water (Setto portion between the connecting part) back side of the flat flanges of the mice. And as shown below, the FEP pipe | tube is connected to the connection part as a connection coupling. First, the fastening member is externally attached to the tip of the FEP pipe connected to the connecting portion while being screwed from the opposite end to the flange. Then, by rotating the fastening member until the flange is positioned on the upper side in the screwing direction with respect to the end of the FEP pipe, the water stop layer of the portion protruding from the flange rides on the outer surface of the FEP pipe. The reaction force caused by being pushed outward in the radial direction of the pipe can bite into the outer surface of the FEP pipe, and the outer surface of the FEP pipe can be sealed with a sponge-like synthetic rubber of the water-stopping layer. Then, the FEP pipe, which has been water-stopped in the water-stopping layer of the external fastening member, is inserted into the through-hole of the connecting portion from the outside of the connecting portion so that the water-stopping layer contacts the outer surface of the connecting portion. In this state, the flat mouth flanged bell mouth is screwed into the FEP tube from the inside of the connecting portion, whereby the connecting portion is fastened from both sides with the flat flange bell mouth and the fastening member. Can be clamped and fixed from both inside and outside by two flanges in the through hole of the connecting portion (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-90884 A (page 2-4, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, most of the connecting portions sandwiched between two flat flanges are made of concrete, and the inner and outer surfaces of such a connecting portion made of concrete are completely flat in terms of molding accuracy. In many cases, there are many irregularities on the surface. Further, the thickness of the wall is often different depending on the portion, and for example, the thickness of the wall located above the through hole may be different from the thickness of the wall located below. In other words, due to the unevenness of the wall surface and the difference in wall thickness, in the conventional joint for connection, there is no gap across the entire contact surface between the sealing surface and the waterproof layer on the inner surface and outer surface of the connection part. The contact cannot be made uniformly, and in some cases, a sufficient water-stopping effect cannot be exhibited.
In addition, due to the elongation of the member and the vibrations such as earthquake with long-term use, the fastening by the fastening member and the bell mouth with the flat flange becomes loose, and the waterproofing effect by the packing and the waterproof layer There was room for improvement since water and the like could enter from the outside.
[0005]
The invention of the present application provides a joint for connection that can sufficiently exhibit water-stopping performance regardless of the unevenness and thickness of the wall surface of the connection part and can maintain a desired water-stopping effect over a long period of time. For the purpose.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, a connection joint for connecting underground pipes in which convex parts and concave parts are alternately positioned in the axial direction of the pipe axis in connection parts such as hand holes and manholes, A cylindrical body having an outer diameter dimension that can be inserted into the through-hole of the section and an inner diameter dimension capable of inserting the underground pipe is provided on both sides of the cylindrical body in the insertion direction. A pair of clamping members are provided for contacting the inner surface and the outer surface and fixing the cylindrical body in a state inserted into the through-hole, and at least one of the clamping members is attached to the cylindrical body. Along the screw part provided on the outer surface It is configured to be capable of screwing in the insertion direction, and is in contact with the peripheral surface of the through hole of the connection portion on the outer surface of the cylindrical body, between the outer surface of the cylindrical body and the peripheral surface of the through hole of the connection portion. A sealing member for sealing the surface of the underground pipe inserted in the cylindrical body. With protrusions that go into the recesses A locking member is provided to prevent it from coming off. And an annular tube packing member capable of being sealed with the tubular body as it is inserted into the tubular body on the outer surface of the distal end portion on the insertion side of the underground pipe into the tubular body. Connecting joints were constructed.
Therefore, the tubular body into which the underground pipe is inserted is clamped from inside and outside of the connecting portion by the pair of clamping members, and the underground pipe is prevented from coming off by the lock member, so that no adhesive or the like is used. The underground pipe and the connecting portion can be fixed in a short time.
Since the through hole of the connecting portion is formed by cutting using a drill or the like, the peripheral surface of the through hole can be formed on a substantially flat surface without any irregularities in any part in the through direction. become. Moreover, since the distance between the circumferential surface of the through hole formed in this way and the outer surface of the inserted cylindrical body is almost the same in any part in the penetration direction, the cylindrical body as in the present invention. By providing a packing member between the outer surface of the through hole and the peripheral surface of the through hole of the connecting portion, the contact surface of the packing member is almost uniformly adhered to the peripheral surface of the through hole at any part without any gap. Not only can the contact be made, but even if the packing member moves in the penetration direction, the contact relationship does not change. Therefore, the water stop performance can be sufficiently exhibited without being related to the unevenness of the inner surface and the outer surface near the through hole and the difference in the wall thickness as in the prior art. Further, even when the clamping state becomes weak (relaxed) after a long time, the water stop state by the packing member does not change or is small, and a sufficient water stop effect can be obtained.
[0008]
In addition, an extension portion extending to the tube axis side than the inner surface of the cylindrical body is formed at the other end of the holding member whose one end contacts the inner surface of the connection portion. You may equip an edge with the curved surface for carrying out contact guidance of the electric wire and cable which are penetrated in the said underground pipe | tube.
[0009]
Also, The screw part Along the outer surface of the cylindrical body along the tube axis direction Place At regular intervals Multiple In order to adjust the length of the cylindrical body in the insertion direction by cutting according to the thickness of the connection section between adjacent screw sections in the tube axis direction of the cylindrical body The length of the cylindrical body may be adjusted according to the thickness of the wall of the connection portion. Therefore, it can cut | disconnect in the suitable location corresponding to the thickness of the wall of a connection part.
[0010]
Further, the underground tube is a spiral tube in which concave portions and convex portions are formed in a spiral shape alternately in the axial direction of the tube, and the lock member is an annular shape positioned on the radially outer side of the cylindrical body. An outer side portion of the cylindrical body, an annular inner portion located between the inner surface of the cylindrical body and the outer surface of the underground tube, and an end portion on the same side in the insertion direction of the connecting portion of the outer side portion and the inner side portion A lock body having a substantially U-shaped cross section composed of an annular coupling portion that couples each other, and is extended to the connection portion side at a predetermined interval in the circumferential direction of the outer portion of the lock body, and A plurality of locking claws that can be locked to the locked portion that protrudes radially outward at the outer end of the connecting portion of the cylindrical body, and protrudes radially inward on the radially inner surface of the inner side of the lock body. A spiral that enters the recess of the underground pipe Above You may comprise from a protrusion part.
[0011]
Further, the underground tube is a spiral tube in which concave portions and convex portions are alternately formed in a spiral shape in the tube axis direction, and the lock member is connected to the inner surface of the cylindrical body and the underground tube. An annular lock body positioned between the outer surface and a circumferentially extending direction of the lock body, extending to the connection portion side at a predetermined interval, and radially inward at the connection portion outside end portion of the cylindrical body A plurality of locking claws that can start at a locked portion formed of an annular recess, a spiral protrusion that protrudes radially inwardly into the radial inner surface of the lock body and enters the recess of the underground pipe Further, the lock body may be configured to include a restraining portion that protrudes radially outward of the lock body and prevents the entire lock body from entering between the tubular body and the underground pipe.
[0012]
Moreover, you may make the said cylindrical body equip the annular recessed part for making the said packing member enter.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a connection joint in a substantially circular through hole (only one is shown in the figure, but two or more may be provided) 1A formed in a concrete connection portion 1 such as a handhole or a manhole. 2 shows the underground pipe 3 connected through 2. In the figure, the underground pipe 3 is connected to the side wall of the connecting portion 1, but it may be connected to the bottom wall or the top wall.
The through-hole 1A is cut using a tool such as a drill and finished so that no irregularities are formed on the cut peripheral surface and a substantially flat surface is formed in the penetration direction.
[0014]
The underground pipe 3 is made of synthetic resin such as polyethylene so as to have some flexibility and stretchability. As shown in FIG. 1, as shown in FIG. Concave portions 3B raised in a circular shape are formed in a spiral shape alternately positioned in the tube axis direction, but the shapes of the convex portions 3A and the concave portions 3B are semicircular, square, You may form in any shape, such as a triangle shape, an ellipse shape, and a trapezoid shape. The underground pipe 3 may be formed in a ring shape in which the convex portions 3A and the concave portions 3B are alternately positioned in the annular direction in the tube axis direction.
[0015]
As shown in FIGS. 1 to 8 (a) and 8 (b), each member of the connection joint 2 has an outer dimension that can be inserted into the through hole 1A of the connection portion 1, and the underground A circular cylindrical body 4 having an inner diameter dimension capable of inserting the embedded pipe 3 and having a dimension in the tube axis direction longer than a radial dimension, and both sides of the cylindrical body 4 in the insertion direction are provided. And a pair of clamping members 5A and 5B (5, 5) for fixing the cylindrical body 4 in a state of being inserted into the through-hole 1A, and at least a part of the outer surface of the cylindrical body 4 It comprises a packing member 6 for sealing between the peripheral surface of one through hole 1A and a lock member 7 for preventing the underground tube 3 inserted in the cylindrical body 4 from coming off. . Among these, the said cylindrical body 4, the clamping member 5, and the locking member 7 consist of synthetic resins, such as polyethylene, similarly to the said underground pipe | tube 3. As shown in FIG. When it is not necessary to prevent the underground buried pipe 3 from being removed by the lock member 7, the lock member 7 may be omitted.
[0016]
As shown in FIGS. 1 and 2, a plurality of screw portions 8,..., 8 having substantially the same length along the tube axis direction (longitudinal direction) are provided on the outer surface of the cylindrical body 4. . The pair of sandwiching members 5A and 5B can be screwed in the insertion direction of the tubular body 4 along screw portions 8 and 8 (remaining screw portions will be described later) located at both ends in the tube axis direction. In addition, by changing the length of each screw portion 8, the screwing range of the clamping members 5A and 5B can be adjusted, and the thickness variation of the connecting portion 1 can be absorbed to some extent by the screw portion 8. is there. Further, the clamping members 5A and 5B screwed to both sides of the cylindrical body 4 in a state of penetrating through the through hole 1A are respectively screwed to the connection part side, whereby the clamping member 5A inside the connection part 1 is moved. While making contact with the inner surface 1B of the wall, the holding member 5B outside the connection portion 1 is in contact with the outer surface 1C of the wall, and the cylindrical body 4 is fixed to the connection portion 1. Furthermore, the cylindrical body 4 includes an annular recess 9 for allowing the packing member 6 to enter. Therefore, when the cylindrical body 4 provided with the packing member 6 in the annular recess 9 is inserted into the through hole 1A of the connecting portion 1, the cylindrical body 4 is directly attached to the outer surface of the cylindrical body 4 without the recess. In contrast, the packing member 6 can be prevented from unexpectedly moving, and the size of the through hole 1A with respect to the tubular body 4 can be suppressed as small as possible, but the thickness is increased in the tube diameter direction. A packing member can be used, and the sealing performance between the peripheral surface of the through-hole 1A and the outer surface of the cylindrical body 4 is sufficiently exerted (received a force radially inward from the peripheral surface of the through-hole 1A). And a strong sealing process can be performed. When the cylindrical body 4 is inserted from the outside to the inside of the connecting portion 1, the packing member 6 receives a force directed radially inward by contacting the peripheral surface of the through hole 1 A and receives the annular recess 9. And does not come off from the annular recess 9. In addition, when the rubber | gum which has a water absorption expansibility is used as the packing member 6, while being able to perform the insertion operation | work of the cylindrical body 4 easily, the higher water stop effect can be acquired after completion | finish of an operation | work. Further, the radially projecting wall portion 9A provided by forming the concave portion 9 recessed inward in the tube radial direction as described above is in contact with the insertion tip of the underground tube 3 inserted into the tubular body 4. There is an advantage that a positioning part for limiting the insertion depth can be configured. Further, both of the two holding members 5A and 5B are configured to be freely screwed, but the holding member 5B located on the lock member 7 side is fixed at a predetermined position of the cylindrical body 4 with the packing member 6 interposed therebetween. It may be a thing. In this case, the sandwiching member 5B formed separately on the tubular body 4 may be fixed with an adhesive or the like, or the sandwiching member 5B may be molded together when the tubular body 4 is molded. Good.
[0017]
Further, as shown in FIG. 1, an end portion on the outside of the connecting portion of the cylindrical body 4 is provided with a locked portion 10 that protrudes radially outward from the through hole 1A, and the locking member 7 can be locked. The locked portion 10 is located outside the connecting portion 1 and is provided in an annular shape on the cylindrical body 4. Since the outside diameter of the locked portion 10 is larger than the diameter of the through hole 1A, the end portion without the locked portion 10 is inserted into the through hole 1A of the connecting portion 1 from the outside. The size of the through-hole 1A with respect to the shaped body 4 can be suppressed as small as possible, and the holding members 5A and 5B having a small outer diameter can be used, and the underground pipe 3 can be connected in a state in which rattling is difficult. it can.
[0018]
In addition, the outer surface of the insertion-side distal end portion 3C of the underground tube 3 to the cylindrical body 4 is sealed with an inner surface of the cylindrical body 4 along with the insertion into the cylindrical body 4. A tube packing member 11 is provided. In the pipe packing member 11, the rubber having water absorbability is easier to insert the underground pipe 3 into the cylindrical body 4 during the connection work, and after the connection work, the underground pipe 3 and the cylindrical body are connected. A high water stop effect can be obtained. Also, the inner surface of the pipe packing member 11 is provided with a spiral uneven portion so that it can be sealed by screwing it into the underground pipe 3, and the pipe packing member 11 is placed in the ground. Although it can be attached simply by being screwed into the buried pipe 3, it may be attached using an adhesive or the like.
[0019]
In this way, the packing member 6 is used to stop water between the peripheral surface of the through hole 1A of the connecting portion 1 and the outer surface of the tubular body 4, and the outer surface of the underground tube 3 and the tubular body are sealed by the tube packing member 11. The water stop between the inner surfaces of the four parts can be performed, and the water stop of the connecting portion 1 can be reliably performed. Further, after the connection work is completed, the clamping member 5A, 5B is loosened after a long period of time, and even if the packing member 6 moves in the through hole 1A, the packing member 6 remains in the through hole 1A. The water stopping ability is not changed or hardly changed, and the same water stopping effect as that immediately after the connection work can be obtained. Similarly, the water packing capacity between the outer surface of the underground tube 3 and the inner surface of the tubular body 4 is hardly changed in the tube packing member 11 without being related to the holding state by the holding members 5A and 5B. Because there is no, high water stopping ability can be maintained even after a long period of time.
[0020]
As shown in FIGS. 1 and 3, the locking member 7 includes a circular and annular outer portion 12 positioned radially outside the cylindrical body 4, an inner surface of the cylindrical body 4, and an underground burial. A circular and annular inner portion 13 positioned between the outer surface of the tube 3 and having a shorter dimension in the tube axis direction than the outer portion 12, and insertion of the connecting portion 1 between the outer portion 12 and the inner portion 13 A lock body having a substantially U-shaped cross section composed of end portions that are on the same side in the direction and connected to each other at a predetermined interval in the circumferential direction of the outer portion 12 of the lock body. A locking claw 15 that extends to the portion 1 side and that engages with the locked portion 10 provided in the cylindrical body 4 and a radially inner surface of the inner side portion 13 of the lock body radially inward. It is comprised from the helical protrusion part 16 which protrudes and penetrates into the recessed part 3B of the underground pipe 3 There. Further, the circumferential length (width) of the locking claw 15 is formed to be shorter than the length between the adjacent locking claws 15, so that it is easy to bend and can be engaged with a smaller force. Although there exists an advantage which can be set as a stop state, you may form the same or long. Moreover, the axial center direction outer side part of the cylindrical body 4 of the said to-be-latched part 10 is formed in the taper surface 10A. Therefore, only by rotating the lock member, the spiral projecting portion 16 is screwed to the connection portion side along the spiral recessed portion 3B of the underground tube 3. Then, the locking claw 15 rides on the taper surface 10A and moves to a substantially vertical locked surface 10B perpendicular to the tube axis direction in which the locking claw 15 locks, thereby smoothly engaging the lock member 7. It can be stopped. Therefore, it is possible to move the lock member to the connecting portion only by rotating the lock member 7 and to gradually move the locking claw 15 radially outward using the tapered surface 10A of the locked portion 10. The locking claw 15 can be ridden with a small operating force to be in a locked state. Further, when releasing the locked state, the locked state can be released by breaking the locking claw 15 with a tool such as a screwdriver or a burl. Since it is short with respect to the locking claw 15, it is easy to be broken and the locked state is easily released.
[0021]
As shown in FIGS. 1 and 2, a plurality of screw portions 8, 8,... (At least a clamping member 5A are screwed onto the outer surface of the cylindrical body 4 along the tube axis direction (longitudinal direction). (It can also be carried out by omitting the screw portion 8 other than the screw portion 8 to be provided) in a state where it is not continuous at a predetermined interval. The cylindrical body 4 has an annular recess 9 formed at an intermediate portion in the tube axis direction thereof and an end opposite to the side on which the locked portion 10 is formed (an inner tip of the connecting portion 1). Between the adjacent screw parts of the screw parts 8,..., 8 provided between them, a visible cut part 17 (17A, 17B, 17C) is provided, and the thickness of the connecting part 1 (the length of the through hole 1A). Accordingly, it is possible to adjust the length of the cylindrical body 4 in the insertion direction (tube axis core direction) by cutting the specific cutting portion 17A, 17B or 17C. And even if it cut | disconnects any cutting part as mentioned above and the length of the cylindrical body 4 is changed, the packing member 6 can be contacted and sealed to the appropriate location of the surrounding surface of the said through-hole 1A. In addition, the cylindrical body 4 can be fixed to the connecting portion 1 by the pair of clamping members 5A and 5B. For example, when the thickness of the connecting portion 1 is 30 to 65 mm, as shown in FIG. 7A, it is cut and used at the cutting portion 17A closest to the annular recess 9, and the thickness of the connecting portion 1 is 65. In the case of ˜100 mm, as shown in FIG. 7 (b), it is cut and used at the cutting portion 17 B that is second closest to the annular recess 9, and when the thickness of the connecting portion 1 is 100 to 135 mm, As shown in FIG. 7C, when the cutting portion 17C farthest from the annular recess 9 is used for cutting, and when the thickness of the connecting portion 1 is 135 to 170 mm, the cutting portion 17 as shown in FIG. It will be used as is without cutting. Accordingly, while using a single (one type) cylindrical body 4, by cutting the cutting portion 17 (17A, 17B, 17C) in accordance with the thickness of the connection portion 1, four types of dimensions (lengths) are obtained. ) Of the cylindrical body 4. In addition, the said cutting | disconnection part 17 may be 1 or 2 or 4 or more, and the cutting part 17 may be abbreviate | omitted depending on the case.
The cutting portion 17 is an annular concave portion formed in a V shape or U shape, and the depth thereof is shallow enough to be positioned so that the cutting blade can enter and be easily cut (for example, 0.9 mm). Since the depth is set, the strength of the cylindrical body 4 at that portion does not decrease. In this way, by forming these recesses (cutting portions) 17, the cutting position can be made visible, and the cutting position may be made visible by marking with paint or magic.
[0022]
As shown in FIG. 1 and FIGS. 8A and 8B, the clamping members 5A and 5B (5, 5) are connected to the inner surface 1B of the connecting portion 1 at one end of a cylindrical body having a screw portion on the inner surface. An inner-side clamping member 5A having a circular annular flange 5a that contacts the outer surface 1C, and a circular and annular flange 5b that contacts the outer surface 1C of the connecting portion 1 at one end of a cylindrical body having a screw portion on the inner surface. The inner side clamping member 5A is provided with a grip portion 27 on the outer peripheral surface thereof, and is screwed along the screw portion 8 provided in the cylindrical body 4. When the internal holding member 5A is rotated, the grip portion 27 can be used as a finger catching portion, and the internal holding member 5A can be reliably rotated without slipping. Further, the inner clamping member 5A forms an extending portion 18 extending toward the tube axis side (inner side in the tube diameter direction), and a curved surface 19 is provided at the end of the extending portion 18 on the tube axis side. In addition, contact and guidance can be performed without damaging the electric wires and cables that are passed through the underground buried pipe 3, and the internal clamping member 5A can also be configured as a bell mouth. .
The outer side clamping member 5B has a grip portion 27 on the outer peripheral surface like the inner side clamping member 5A, and can easily grip the outer side clamping member 5B when the cylindrical body 4 is screwed and can reliably rotate. I am doing so.
[0023]
Although the procedure for connecting the underground buried pipe 3 to the connecting portion 1 using the connection joint 2 will be described, the procedure may be performed other than the procedure described. When the length of the tubular body 4 in the tube axis direction (longitudinal direction) needs to be adjusted according to the thickness of the connecting portion 1, the tube 4 is cut at the cutting portion 17 (17A, 17B, 17C). The length is adjusted in advance.
First, as shown in FIG. 4, while rotating the external holding member 5B from the distal end portion on the insertion side of the cylindrical body 4 to the connection portion 1, that is, the end portion on the side away from the locked portion 10, It is screwed to the vicinity of the locked portion 10 and is externally mounted. Subsequently, the packing member 6 is inserted into the annular recess 9 while being extrapolated from the distal end portion on the insertion side to the connection portion 1 of the cylindrical body 4 in the same manner as described above. Further, as shown in FIG. 5, the cylindrical body 4 including the external clamping member 5 B and the packing member 6 is inserted into the through hole 1 A from the outside of the connection portion 1. Then, the inner clamping member 5A is screwed to a position where it comes into contact with the inner surface 1B of the connecting portion 1 to the insertion side tip (inner side tip) of the cylindrical body 4 protruding inside through the through hole 1A. After that, as shown in FIG. 6, the external holding member 5B is screwed to the connecting portion 1 side and brought into contact with the outer surface 1C of the connecting portion 1 to thereby connect the connecting portion 1 to the holding members 5A and 5B. Then, the cylindrical body 4 is fixed to the connecting portion 1.
Then, as shown in FIG. 6, the underground tube 3 can be inserted into the tubular body 4 while rotating the lock member 7 from the insertion-side distal end portion 3 C to the tubular body 3. After extrapolating to a certain position, the pipe packing member 11 is provided on the outer surface of the distal end portion on the insertion side of the underground pipe 3 into the cylindrical body 4 as described above. Next, the underground pipe 3 including the pipe packing member 11 and the lock member 7 is inserted into the cylindrical body 4 fixed to the connection portion 1 from the outside of the connection portion 1. Thereafter, the locking member 7 is rotated so as to be screwed to the connection portion side, and the locking claw 15 of the locking member 7 is locked to the locked portion 10 of the cylindrical body 4, so that the underground pipe 3 can be connected to the connecting portion 1 in a state in which it is prevented from being detached. Here, although the case where the underground pipe 3 provided with the spiral concavo-convex part was used was shown, when the underground pipe 3 provided with the annular concavo-convex part is used, the retaining pipe of the underground pipe 3 is prevented. For example, the lock member is composed of two halved members that are divided into two parts vertically and horizontally, and these two halved members cover the cylindrical body 4 in which the underground tube 3 is inserted and both of them. By connecting the members by locking or the like, the underground buried pipe 3 is prevented from coming off the cylindrical body 4.
[0024]
The curved surface 19 of the inner clamping member 5A shown in FIGS. 1 and 8A is formed on the inner surface of the protruding portion 19T that protrudes toward the outer side in the tube axis direction of the cylindrical body 4. However, as shown in FIG. 9, a sandwiching member 5 C having a curved surface 19 A on the inner surface of the extending portion 18 A that protrudes inward in the tube axis direction of the tubular body 4 is attached to the tubular body 4. It is good also as making it possible to contact and guide the said electric wire, a cable, etc.
Further, in FIGS. 1 and 9, the electric wires, cables and the like are contacted and guided by the clamping members 5 A and 5 C provided inside the connection portion 1, but as shown in FIG. A cylindrical curved surface 20 is provided on the inner side end of the connecting portion 1 on the inner surface of the concave portion that is curved in a U shape toward the inside in the radial direction so that the electric wire, the cable, and the like can be guided by contact. Also good. In this case, the same clamping member 5 (5B, 5D) can be used for the clamping member 5D that is clamped inside the connection part 1 and the clamping member 5B that is clamped outside the connection part 1, and the number of parts is reduced. Can be achieved.
[0025]
Further, as shown in FIG. 11, the inner surface of the annular recess 9 B is formed by forming an annular recess 9 B into which the packing member 6 A is inserted into a U-shaped recess (mountain shape) radially inward. The curved surface 9C may also be formed as a bell mouth that guides and contacts an electric wire or cable. It should be noted that the connecting portion is arranged so that an electric wire, a cable, or the like passed through the underground buried pipe 3 does not contact the inner side end of the cylindrical body 4 at the inner side end of the cylindrical body 4. 1 is provided with an extending portion 21 extending toward the tube axis side of the cylindrical body 4 at the inner end portion thereof, and the tube axis side end portion of the extending portion 21 is formed into a cylindrical shape. The central part of the body 4 in the tube axis direction (the central part in the longitudinal direction) is formed in an arc shape having a top, so that contact guidance can be performed without damaging an electric wire or cable.
[0026]
Moreover, in FIG. 1, FIG. 9-FIG. 11, the to-be-latched part 10 protrudes from the outer surface of the said cylindrical body 4, and the locking member 7 is latched by this to-be-latched part 10, and an underground pipe | tube is carried out. Although retaining is performed, as shown in FIG. 12, a locked portion 22 formed of an annular groove is formed on one end side in the tube axis direction of the cylindrical body 4A and on the radially inner surface. A locking member 7A provided with a locking claw 23 to be engaged with the portion 22 can be inserted between the cylindrical body 4A and the underground pipe 3 and is substantially the same as the inner diameter of the cylindrical body 4. It can be configured in a cylindrical shape having the same outer diameter, and the locking claw 23 of the lock member 7 A can be locked to the locked portion 22 provided on the inner surface of the cylindrical body 4 to prevent the locking member 7 A from coming off. In FIG. 12, the locked portion 22 is formed on the inner surface of the cylindrical body 4, and the locking claw 23 locked to this is provided on the lock member 7A. However, as shown in FIG. The locking member 7A can be provided with the locking claw 23 locked to the locking member 7A, and the locking claw 23 locked to the locking claw 23 can be formed.
The lock member 7 A extends to the connecting portion side at a predetermined interval in the circumferential direction of the lock body 24, and a cylindrical lock body 24 having the locking claw 23 at the tip, and the locked portion 22. A plurality of locking claws 23 to be engaged with each other, a spiral projecting portion 16 projecting radially inwardly into the radially inner surface of the lock body 24 and entering the recess 3B of the underground tube 3, and the lock body 24 And a restraining portion 25 that prevents the entire lock body 24 from entering between the cylindrical body 4A and the underground pipe 3. The other members are the same as those shown in FIG. In the cylindrical body 4 shown in FIG. 1 and the like, the locked portion 10 is provided on the outer surface of the cylindrical body 4, but the cylindrical body 4A shown in FIGS. The locking portion 22 is provided on the inner surface of the cylindrical body 4A. Therefore, the thickness of the cylindrical body 4A shown in FIGS. 12 and 13 is made thicker than that of the cylindrical body 4 shown in FIGS. The strength in this portion is not greatly reduced. Since the cylindrical body 4A in which the locked portion 22 is provided on the inner surface does not include a protruding portion (locked portion) on the outer surface, the through hole 1A of the connecting portion 1 is inserted into the through hole 1A from the inner side of the connecting portion 1. The cylindrical body 4A can be inserted toward the outside. In short, the cylindrical body 4 can be inserted into the through hole 1A from either end, which is advantageous in terms of connection work.
[0027]
The lock member 7A shown in FIG. 12 includes the locking claw 23 at the end on the connection portion side, but the lock member 7 shown in FIG. A protrusion 16 that enters the recess 3B of the underground tube 3 inside the lock body 24 in the radial direction, a restraining portion 25 that prevents the entire lock body 24 from entering the inside of the cylindrical body 4A, and the cover A locking portion 26 that locks to the locking portion 22 is provided.
[0028]
【The invention's effect】
As described above, the connection work can be performed in a short time by fixing the cylindrical body by the clamping members provided both inside and outside the connection portion. In addition, a packing member that seals between the outer surface of the cylindrical body and the peripheral surface of the through-hole by contacting with the peripheral surface of the through-hole of the connecting portion that is cut so as not to have an uneven surface and is formed on a flat surface. By providing to the cylindrical body, water stoppage is not performed on the wall surface of the through hole as in the conventional case, so that the water stop performance is fully exhibited without being related to the unevenness or thickness difference of the wall surface of the connection part. be able to. In addition, even when the clamping by the clamping member becomes loose after a long time, the water stop effect does not change or hardly changes, and a highly reliable connection joint can be provided.
[0029]
In addition, the outer surface of the distal end portion on the insertion side of the underground tube is provided with an annular tube packing member capable of sealing between the tube and the underground tube. By simply inserting the underground pipe, a water stop process (sealing process) between the tubular body and the underground pipe can be performed.
[0030]
In addition, the clamping member located inside the connecting portion includes an extending portion extending toward the tube axis side of the tubular body at the inner side end portion, and a curved surface at the end portion of the extending portion on the tube axis side. Therefore, the holding member can obtain the same effect as the bell mouth, and can smoothly bend the electric wire and cable. As a result, the number of members can be reduced.
[0031]
In addition, since the outer surface of the cylindrical body is provided with a plurality of screw portions, a cutting portion that can be cut according to the thickness of the connecting portion is provided between adjacent screw portions in the tube axis direction of the cylindrical body. The length of the cylindrical body in the insertion direction (tube axis direction) can be adjusted according to the thickness of the connecting portion. Therefore, while using a single cylindrical body, it is possible to produce a cylindrical body having a large number of lengths by cutting the cutting portion in accordance with the thickness of the connecting portion, and in terms of manufacturing and inventory management. Either of these is advantageous.
[0032]
In addition, when the underground pipe is a spiral pipe, the protrusion provided on the lock member enters the concave portion of the underground pipe, so that the lock member is formed into a cylindrical body with a small force enough to rotate the lock member. It can be easily locked.
In addition, since the locking claw is located on the outer side in the radial direction of the cylindrical body and extends toward the connecting portion with a predetermined interval in the circumferential direction of the locking member, the locking claw can be removed by breaking the locking claw. The stopped state can be easily released.
[0033]
In addition, when the locking claw is located between the inner surface of the cylindrical body and the outer surface of the underground tube, it is not necessary to provide a locked portion on the outer surface of the cylindrical body. It can be inserted from the inside to the outside.
[0034]
In addition, since the annular recess for allowing the packing member to enter the cylindrical body is provided, when the cylindrical body is inserted into the through-hole, the annular recess can enter the packing member to prevent the movement and be buried in the ground. It can be used as a positioning member for regulating the insertion depth of the tube.
[Brief description of the drawings]
FIG. 1 is an exploded cross-sectional view in which only the upper half of a connection joint is sectioned in a state where an underground pipe is connected to a connection part having a thick wall through the connection joint.
FIG. 2 is an exploded side view of the underground pipe and the joint for connection.
FIG. 3 is a front view of a lock member.
FIG. 4 is an exploded cross-sectional view in which only the upper half of the joint for connection is cross-sectioned in a state in which the external clamping portion and the packing member are extrapolated into a cylindrical body.
FIG. 5 is an exploded cross-sectional view in which only the upper half of the connection joint is sectioned in a state in which the cylindrical body is inserted into the connection portion and the inner clamping member is in contact with the inner surface of the connection portion.
FIG. 6 is an exploded cross-sectional view in which only the upper half of the joint for connection is cross-sectioned in a state where the connecting portion is held inside and outside by a holding member and the underground pipe is inserted into the cylindrical body.
FIG. 7 is a side view showing a state in which a buried underground pipe is connected to each of connection portions having walls of three types of thickness via connection joints.
8A and 8B show a clamping member, in which FIG. 8A is a front view of the clamping member provided inside the connection portion, and FIG. 8B is a front view of the clamping member provided outside the connection portion.
FIG. 9 is an exploded cross-sectional view in which only the upper half of the joint for connection is shown in cross section, showing another implementation state of the clamping member inside the connection portion.
FIG. 10 is an exploded cross-sectional view in which only the upper half of the connection joint provided with a curved surface at the inner end of the connection part of the cylindrical body is shown in cross section.
FIG. 11 is an exploded cross-sectional view in which only the upper half of a connecting joint provided with a curved surface in an annular recess of a cylindrical body is shown in cross section.
FIG. 12 is a cross-sectional view of a connection joint in which a lock member is positioned between the inner surface of a cylindrical body and the outer surface of a buried underground pipe, and a locking claw is provided at the distal end of the connection portion side of the lock member. .
FIG. 13 is a joint for connection when a lock member is positioned between the inner surface of the cylindrical body and the outer surface of the underground pipe, and the locked portion is provided at the outer end of the connection portion of the cylindrical body. FIG.
[Explanation of symbols]
1 Connection 1A Through hole
1B inner surface 1C outer surface
2 Joint for connection 3 Underground pipe
3A Convex 3B Concave
3C Insertion end
4,4A Tubular body
5,5A, 5B, 5C, 5D, 5E Holding member
5a, 5b flange
6,6A packing material
7, 7A Locking member 8 Screw part
9 Annular recess 9A Wall
9B Annular recess 9C Curved surface
10 Locked part 10A Tapered surface
10B Locked surface 11 Pipe packing member
12 outer part 13 inner part
14 connecting part 15 locking claw
16 Projection
17, 17A, 17B, 17C Cutting part
18, 18A extension part
19, 19A Curved surface
19T protrusion
20 cylindrical curved surface 21 extension part
22 Locked part 23 Locking claw
24 Lock body 25 Deterrence section
26 Locking part 27 Gripping part

Claims

A joint for connecting underground pipes in which convex parts and concave parts are alternately positioned in the direction of the pipe axis to connecting parts such as hand holes and manholes, which can be inserted into the through holes of the connecting parts A cylindrical body having an outer diameter dimension and an inner diameter dimension capable of inserting the underground pipe is provided, and contacts the inner surface and the outer surface of the connection portion on both sides in the insertion direction of the cylindrical body. A pair of clamping members for fixing the cylindrical body in a state of being inserted into the through hole, and inserting at least one of the clamping members along a screw portion provided on an outer surface of the cylindrical body The outer surface of the cylindrical body is in contact with the peripheral surface of the through hole of the connecting portion and between the outer surface of the cylindrical body and the peripheral surface of the through hole of the connecting portion. a packing member for sealing treatment provided, enters the recess of the underground tubes inserted into the said tubular body projecting A locking member for retaining comprise providing, on the insertion side leading end portion outer surface of the tubular body of the underground pipe, enabling sealing process with the cylindrical body with the insertion into the tubular body A connecting joint comprising an annular tube packing member .

An extension portion extending to the tube axis side from the inner surface of the cylindrical body is formed at the other end of the clamping member whose one end contacts the inner surface of the connection portion, and the tube axis side end portion of the extension portion The connecting joint according to claim 1, further comprising a curved surface for guiding and guiding an electric wire or cable that is passed through the underground pipe.

Let a plurality of the screw portion at a Jo Tokoro intervals along the pipe axis direction of the tubular body, between threaded portion adjacent in pipe axis direction of the tubular body, depending on the thickness of the connecting portion The connection joint according to claim 1, wherein a cutting portion for adjusting the length of the cylindrical body in the insertion direction to the connection portion is provided so as to be visible.

The underground tube is a spiral tube in which concave portions and convex portions are formed in a spiral shape alternately in the tube axis direction, and the lock member is an annular outer side located on the radially outer side of the cylindrical body. A ring-shaped inner portion located between the inner surface of the cylindrical body and the outer surface of the underground tube, and the end portions on the same side in the insertion direction of the connecting portion of the outer portion and the inner portion. A lock body having a substantially U-shaped cross section comprising an annular connecting portion to be connected, and extending to the connecting portion side at a predetermined interval in the circumferential direction of the outer portion of the lock body, and the cylindrical shape A plurality of locking claws that can be locked to a locked portion that protrudes radially outward at the outer end of the connecting portion of the body, and that protrudes radially inward to the radially inner surface of the inner portion of the lock body. formed by composed of a spiral of the projecting portion entering the recess of the underground pipe according to claim 1 connection joint according.

The underground tube is a spiral tube in which concave portions and convex portions are alternately formed in a spiral shape in the tube axis direction, and the lock member includes an inner surface of the cylindrical body and an outer surface of the underground tube. An annular lock body located between the two and the outer circumferential end of the lock body and extending to the connecting portion side at a predetermined interval, and radially inwardly connected to the outer end of the connecting portion of the cylindrical body A plurality of locking claws that can be locked to the locked portion made of a concave portion, a spiral protruding portion that protrudes radially inwardly into the radial inner surface of the lock body and enters the concave portion of the underground tube, 2. The connection according to claim 1, further comprising a restraining portion that protrudes radially outward of the lock body and prevents the entire lock body from entering between the tubular body and the underground pipe. Fittings.

The joint for connection according to claim 1, wherein the cylindrical body is provided with an annular recess for allowing the packing member to enter.