JP4503732B2

JP4503732B2 - Continuous water branch joint

Info

Publication number: JP4503732B2
Application number: JP22279199A
Authority: JP
Inventors: 誠一人見; 和芳山本
Original assignee: Sekisui Chemical Co Ltd
Current assignee: Sekisui Chemical Co Ltd
Priority date: 1999-08-05
Filing date: 1999-08-05
Publication date: 2010-07-14
Anticipated expiration: 2019-08-05
Also published as: JP2001050461A

Description

【０００１】
【発明の属する技術分野】
本発明は、既設水道配管等に分岐を設ける際に、既設配管を断水することなく分岐工事を実施し得る不断水分岐継手に関する。
【０００２】
【従来の技術】
従来、既設水道配管に分岐を設ける場合、一定時間、当該分岐工事を行う系統の配管を既設配管網に設けられた直近のバルブを閉じ、当該系統の配管を断水して分岐工事が行われてきた。
しかしながら、分岐工事の実施箇所にもよるが、一般に可成り広範囲の家庭、事業場等の水道が断水するものであって、その影響は、単に不便であるという範囲を超え、種々の問題を惹起するものである。
そこで、いきおい、上記分岐工事に人材、資材、機器を大量投入して突貫工事を行うため、工事費が高騰するという問題があった。
【０００３】
【発明が解決しようとする課題】
本発明者らは、既設使用配管の分岐工事において、該既設使用配管を断水することなく分岐工事を行うための不断水分岐継手を発明し、特願平１１−１０２０９号として出願した。
本発明者らは、更に、上記発明の不断水分岐継手の構造を変更することによって、分岐工事における上記不断水分岐継手の取付け作業を迅速、且つ、容易に実施でき、しかも工事中並びに施工後の分岐部の高い水密性を達し得ることを見出し本発明を完成するに至ったのである。
【０００４】
本発明の目的とするところは、既設使用配管を断水することなく分岐工事を行う際の、取付け作業を迅速、且つ、容易に実施し得る不断水分岐継手を提供するものであり、当該分岐工事の工事費を低減させることにある。
【０００７】
【課題を解決するための手段】
本発明によれば、既設配管の外周面を短管部材で包囲し、該短管部材の管端部付近に設けられた既設配管掴持受口と、該既設配管掴持受口間に分岐すべき分岐管受口を突設してなる継手本体、止水パッキン及び離脱防止リングからなり、上記継手本体は、既設配管の管軸に沿って２分割され、既設配管掴持受口の内周面に離脱防止リング装着環状溝Ａを設け、分岐管受口が設けられている分割片の離脱防止リング装着環状溝Ａ間に止水パッキン装着環状溝Ｂを設けてなる不断水分岐継手であって、前記離脱防止リングは、既設配管の管軸に平行する２本の突条と、該突条の両側に、これと直交する少なくとも４本の突条が形成され、２分割されて、上記継手本体の分割片の環状溝Ａ内に装着され、継手本体の分割片同士をボルトとナットで緊締することで、既設配管の外周面に押圧され、前記止水パッキンは、分岐管開口部相当部分に貫通孔が設けられた一方の止水パッキンと、貫通孔が設けられていない他方の止水パッキンに２分割されて、一方の止水パッキンが、環状溝Ｂを有する側の継手本体の分割片に装着され、他方の分割片に装着された止水パッキンとともに既設配管の外周面を包囲することを特徴とする不断水分岐継手が提供される。
【００１１】
【発明の実施の形態】
以下に実施例を掲げて本発明を更に詳しく説明するが、本発明はこれら実施例のみに限定されるものではない。
【００１２】
図１は、本発明の不断水分岐継手を用いる既設配管の分岐工事の説明図であって、図１（イ）に示すように、ポリエチレン製管等の既設配管３０に、止水パッキン１及び離脱防止リング４を装着した金属製等の継手本体２を取付けられた構成の不断水分岐継手が用いられる。
先ず、既設配管の所定の分岐すべき位置に本発明の不断水分岐継手が取り付けられ、次いで、継手本体２に仕切弁３１を取り付け、仕切弁３１に穿孔機３２を取り付ける。この際、仕切弁３１の弁体３３は開けておく。
【００１３】
その後、図１（ロ）に示すように、穿孔機３２のカッター３４で既設配管３０の所定分岐箇所に穿孔する。この際、既設配管３０の被穿孔部３０ａは、カッター３４の錐部３５が貫通状に刺着され、被穿孔部３０ａが、既設配管３０内に流れ込むことはない。
【００１４】
その後、図１（ハ）に示すように、穿孔機３２のカッター３４を元に戻し、弁体３３を閉じ、既設配管３０からの流水を防ぐ。
そして、図１（ニ）に示すように、穿孔機３２を取り外し、分岐管３６を仕切弁３１に接合して分岐配管工事は既設配管３０断水することなく完了する。
分岐管３６の接合後、弁体３３を開ければ、新たに敷設された分岐管に通水することができる。
従って、従来のように断水し、既設配管の所定分岐箇所を切断して除去し、該切除された部分にＴ字管を接合する手間が無く、完工後の断水工事に伴う洗浄排水等の煩わしさが無く、工費の節減や工期の短縮が大幅に実現できる。
【００１５】
図２は、本発明の不断水分岐継手に用いられている止水パッキン１の一例を示す斜視図である。図３は、本発明の不断水分岐継手が取り付けられた既設配管３０を、既設配管３０の管軸に直交する面で不断水分岐継手の分岐管３６を縦断した断面図である。又、図４は、図３の本発明の不断水分岐継手が取り付けられた既設配管３０を、上記分岐管３６の管軸を含む面で横断した断面図である。図２の止水パッキン１は、図３及び図４の上記不断水分岐継手から止水パッキン１のみを管軸方向に抜き出した状態を示している。
【００１６】
即ち、図２の上側の止水パッキン１ａは、分岐管受口３が設けられている分割片２ａの環状溝Ｂに装着され、既設配管３０の外周面３０ｂに密着するものであるが、分岐管３６開口部相当部分には貫通孔１ｃが設けられ、分岐管３６の基部の一要素を構成するものであり、該貫通孔１ｃの周縁部に装着される止水パッキン１ａは、これを介して上記分岐管３６開口部の周りの分割片２ａ内周面と既設配管３０の外周面３０ｂとを水密に充填し、他方、分岐管受口３が設けられていない分割片２ｂの環状溝Ｂに装着される止水パッキン１ｂは、その全面において、既設配管３０の外周面に密着し、その側端縁において上記止水パッキン１ａの側端縁にに突き合わせられ、これらが一対となって既設配管３０の外周面３０ｂを包囲している。
【００１７】
次に、図３に示されるように、分割片２ａと２ｂが、各々の分割片２ａと２ｂに設けられたフランジにおいてボルト１１とナット１２で緊締されると、上記止水パッキン１ａ及び１ｂは、両者の側端の突き合わせ面において密着し、既設配管３０の外周面３０ｂを包囲し、分割片２ａと２ｂ内周面と既設配管３０の外周面３０ｂの間に挟着されて上記フランジ３ａ付分岐管受口３を既設配管３０に水密に形成することを可能にする。
【００１８】
このように止水パッキン１ａ及び１ｂが装着された分岐管受口３より分岐水が流れるようになると、継手本体２と既設配管３０の外周面３０ｂの間隙に露出している止水パッキン１ａに穿設されている貫通孔１ａ内側壁面に水圧が負荷され、上記間隙に押し込まれるので該間隙の水密性は一層高まり、止水の十全を期すことができる。
【００１９】
図４に示されるように、分割片２ａと２ｂからなる継手本体２の内周面には、上記フランジ３ａ付分岐管受口３を挟んで両側に既設配管３０の管軸に直交する方向に２個の環状溝Ａが設けられ、該環状溝Ａには、図５に示される、既設配管３０の管軸に平行する２本の突条４ａと該突条４ａの両側にこれと直交する少なくとも４本の突条４ｂが設けられた離脱防止リング４が２分割されて各々の分割片２ａと２ｂに装着され、２個の２分割離脱防止リング４が各々既設配管３０の外周面３０ｂを包囲し、継手本体２内周面と既設配管３０の外周面３０ｂの間に挟着されてなり、２本の上記突条４ａは、既設配管３０の周方向の応力に対するズレ防止に寄与し、少なくとも４本の上記突条４ｂは、既設配管３０の管軸方向の応力に対するズレ防止に寄与し、両者相俟って継手本体２の既設配管３０の外周面３０ｂからの離脱防止作用を発現するものである。
【００２０】
図６（イ）は、本発明の不断水分岐継手に用いられる止水パッキン１ａ及び１ｂを取り出して示す斜視図である。図６（イ）において、止水パッキン１ａは、図４に示される継手本体２の分割片２ａ内周面の設けられた２分割された環状溝Ａに嵌着され、止水パッキン１ｂは、同様に分割片２ｂ内周面の設けられた２分割された環状溝Ａに嵌着される止水パッキンである。上記止水パッキン１ａには、分岐管３６相当部分に貫通孔１ｃが設けられ、該貫通孔１ｃの周縁の内外両面に閉環状突条１ｄ及び１ｅが各々設けられている。
【００２１】
図６（ロ）は、図６（イ）に示された止水パッキン１のＶＩ−ＶＩ線における断面図であって、止水パッキン１の内外両面に設けられた閉環状突条１ｄ及び１ｅが、既設配管３０外周面３０ｂ及び継手本体２内周面の両面に突設されている状態を示している。
【００２２】
図６（ハ）は、図６（イ）に示された止水パッキン１のうち、止水パッキン１ａのみを取り出し、内周面の状態を示す斜視図であり、分岐管３６相当部分の貫通孔１ｃの周縁の内周面に突設されている閉環状突条１ｅが突設されている状態を概観し得るように描かれている。
【００２３】
図６（イ）〜（ハ）に示されるように閉環状突条１ｄ及び１ｅが止水パッキン１ａの内外両面に設けられているので、止水パッキン１ａの厚さのバラツキが少々大きいものであっても、又、止水パッキン１ａの表面に少々の傷が付いたりしていても、継手本体２の分割片２ａ及び２ｂが緊締され、止水パッキン１ａ及び１ｂが既設配管３０外周面３０ｂと継手本体２の内周面との間に挟着されれば、上記閉環状突条１ｄ及び１ｅが分岐管３６相当部分の貫通孔１ｃを既設配管３０外周面３０ｂ及び継手本体２内周面の両面において確実に止水し得るものとなる。
【００２４】
図７は、本発明の不断水分岐継手の参考例につき、分岐管受口３と既存配管３０に取り付けられる短管部材の直交する管軸を含む面における断面図であって、上記不断水分岐継手が取り付けられる既設配管３０の位置を二点鎖線で示した。図７において、分岐管受口３が設けられている分割片２ａの環状溝Ａの間に、分岐管３６開口部を除く周縁部内周面に止水パッキン装着湾曲溝Ｃが形成されされている。上記湾曲溝Ｃの周縁部は、環状溝Ａ及び湾曲溝Ｃ以外の内周面と同じ曲面で縁取りされてなるものであり、湾曲溝Ｃには、分岐管開口部相当部分の貫通孔１ｃが穿設されている止水パッキン１ａが装着される。
【００２５】
前記するように、分割片２ａと２ｂが、各々の分割片２ａと２ｂに設けられたフランジにおいてボルト１１とナット１２で緊締されると、上記止水パッキン１ａは、継手本体２と既設配管３０の外周面３０ｂとの間の隙間の内、湾曲溝Ｃの周縁部で縁取りされた内側の部分とその他の継手本体２と既設配管３０の外周面３０ｂの突合わせ面とを水密に絶縁し得るものとなる。従って、この不断水分岐継手においては、分岐管が設けられていない分割片内周面と既設配管３０の外周面３０ｂの突合わせ面には、必ずしも止水パッキンを介在させなくともよい。勿論、同様の性能を有するパッキンを緩衝材として分割片の緊締を確実にする目的等で使用されてもよい。
【００２６】
本発明の参考例における上記湾曲溝Ｃの周縁部の縁取りは、湾曲溝Ｃの周縁部で縁取りされた内側の部分とその他の継手本体２と既設配管３０の外周面３０ｂの突合わせ面とを水密に絶縁するためのものであって、分岐管受口３が設けられている分割片２ａの他の分割片２ｂと突合せ面部分の縁取りは、分岐管受口３が設けられている分割片２ａ側に前述するように設けられていてもよいが、図８に示されるように、分岐管受口３が設けられている分割片の湾曲溝Ｃは、分岐管受口３が設けられていない分割片との突合せ面側に上記縁取り面がなく開放されされており、分岐管受口３が設けられていない分割片２ｂに設けられ、突き合せによって両者が雄型雌型のように嵌合し合う形態であってもよい。いずれにしても環状溝Ｃに実質的に上記縁取りがなされるものは本発明の範囲外である。
【００２７】
図９は、本発明の不断水分岐継手の参考例につき、継手本体２の分岐管受口３が設けられていない分割片２ｂを示す図面であって、図９（イ）は、上記分割片２ｂの内周面を示す平面図、図９（ロ）は、図９（イ）に示される分割片２ｂのＩＸ−ＩＸ線における断面図である。尚、図９（ハ）は、環状溝等の構造を立体的に分かり易くするために描いた斜視図である。図９において、２本の環状溝Ａの間の内周面に互いに４５°をなして放射状に配列された突起５が設けられたものからなる。分岐管受口３が設けられていない分割片以外の部材は、本発明の不断水分岐継手と同じであるのでこれらの説明は省略する。
【００２８】
前記するように、分割片２ａと２ｂが、各々に設けられたフランジにおいてボルト１１とナット１２で緊締されると、上記止水パッキン１ａは、湾曲溝Ｃの周縁部で縁取りされた内側の部分において、分岐管（受口３）路と継手本体２と既設配管３０の外周面３０ｂの突合わせ面の隙間とを水密に絶縁し得るものとなり、既設配管３０の外周面３０ｂに取り付けられた分岐継手は、放射状に配列された突起５によって、既設配管３０の周方向及び管軸方向に集約される各種の応力に対するズレ防止に寄与し、これら放射状に配列された突起５が相俟って継手本体２の既設配管３０の外周面３０ｂからの離脱防止作用を発現するものである。
【００２９】
図１０は、本発明の不断水分岐継手の参考例につき、継手本体２の環状溝Ａに離脱防止リング４を装着する手段を模式的に示す説明図である。図１０において、継手本体２の内周面に設けられた環状溝Ａに、弾性体６を介して離脱防止リング４が装着されてなるものである。不断水分岐継手に用いられる弾性体６としては、特に限定されるものではないが、例えば、板バネやコイルバネ等のバネ弾性体、架橋ゴム等のゴム弾性体が挙げられる。
【００３０】
前記するように、分割片２ａと２ｂが、各々に設けられたフランジにおいてボルト１１とナット１２で緊締されると、上記弾性体６によって離脱防止リング４は既設配管３０の外周面３０ｂに押圧され、該離脱防止リング４内周面に設けられた前記既設配管３０の管軸及び周方向の突条５の作用と相俟って、既設配管３０の外周面３０ｂを確実に掴持し、既設配管３０の管軸及び周方向のズレを防止すると共に継手本体２の既設配管３０の外周面３０ｂからの離脱防止作用を顕著に発現するものである。
【００３１】
図１１は、本発明の不断水分岐継手の参考例につき、継手本体２の環状溝Ａ及び離脱防止リング４を、各々の周方向に直交する面で断面して示す部分断面図であって、上記環状溝Ａは、継手本体２の分岐管開口部に向かう既設配管３０の管軸方向に各々楔状に拡径された傾斜溝７からなり、環状溝Ａに装着される離脱防止リング４は、上記環状溝Ａの傾斜溝７内を移動可能に尖端部が切除され、楔状に拡径された２分割離脱防止リング４１からなるものである。
【００３２】
上記環状溝Ａの楔状に拡径される傾斜角度は、余り小さいと傾斜溝７の効果が現出さず、余り大きいと急激な応力に対して離脱防止リング４１が滑ってしまい離脱防止効果が失われてしまうので、好ましくは５°〜４５°、より好ましくは１５°〜３０°である。
又、上記環状溝Ａに装着される離脱防止リング４１の楔状に拡径される傾斜角度は、環状溝Ａと同様に、好ましくは５°〜４５°、より好ましくは１５°〜３０°である。
【００３３】
前記するように、分割片２ａと２ｂが、各々に設けられたフランジにおいてボルト１１とナット１２で緊締されると、離脱防止リングは既設配管３０の外周面３０ｂに押圧され、離脱防止リング４１内周面に設けられている前記既設配管３０の管軸及び周方向の突起４ａ及び４ｂの掴持作用と相俟って、互いに楔状に拡径される方向を異にする２個の環状溝Ａと２個の離脱防止リング４１の牽制作用によって、特に、既設配管３０の管軸方向の応力に対し、顕著な離脱防止効果を奏し得るものである。
【００３４】
（実施例１）
水道用ポリエチレン管に図２〜図５に示される本発明の不断水分岐継手を取り付け、分岐管３６路用の口径の穿孔を図１に示した方法で行った。
【００３５】
（比較例１）
図５に示される実施例１の離脱防止リング４の内周面に設けられた突条に替えて、水道用ポリエチレン管の管軸方向の２本の突条４ａが無く、周方向に連続した４本の環状の突条４ｂのみが設けられた離脱防止リングを用いたこと以外、実施例１と同様にして水道用ポリエチレン管に不断水分岐継手を取り付け、分岐管路用の口径の穿孔を図１に示した方法で行った。
【００３６】
（比較例２）
図５に示される実施例１の離脱防止リングの内周面に設けられた突条のうち、水道用ポリエチレン管の管軸に直交してその両側に設けられた突条４ｂを４本から２本に減じたこと以外、実施例１と同様にして水道用ポリエチレン管に不断水分岐継手を取り付け、分岐管路用の口径の穿孔を図１に示した方法で行った。
【００３７】
実施例１及び比較例１、２で得られた不断水分岐継手を取り付けた水道用ポリエチレン管について、原管引張試験、周動応力試験及び耐水圧試験を以下に示す方法で行った。試験結果は表１に示す。
【００３８】
１．原管引張試験：
水道用ポリエチレン管と不断水分岐継手との間に、引張速度１００ｍｍ／分で管軸方向の引張力を付加し、ズレの有無又は破壊形態を観察した。
【００３９】
２．周動応力試験：
水道用ポリエチレン管と不断水分岐継手間に、２０００ｋｇｆ−ｃｍのトルクを負荷したときの両者のズレの有無を観察した。
【００４０】
３．耐水圧試験：
得られた分岐管路に、常法に従い水圧試験を行い、漏水の有無又は破壊形態を観察した。
【００４１】
【表１】

【００４２】
実施例１の不断水分岐継手は、上記のいずれの試験に対しても、原管が材料破壊するまで、不断水分岐継手のズレもなく、漏水もないのに対して、水道用ポリエチレン管の管軸方向の２本の突条がない離脱防止リングを用いた比較例１の不断水分岐継手は、周方向の応力に対しズレてしまい、水道用ポリエチレン管の周方法の突条が４本未満である比較例１の不断水分岐継手は、水道用ポリエチレン管の管軸方向の応力に対しズレてしまうものであった。
【００４３】
（実施例２）
水道用ポリエチレン管に図６に示される止水パッキンを用いた本発明の不断水分岐継手を取り付け、分岐管路用の口径の穿孔を図１に示した方法で行った。
【００４４】
（比較例３）
図６に示される実施例２の止水パッキンに替えて、内外面の閉環状突起１ｄ及び１ｅが無く、厚さを１５％増大した止水パッキンを用いたこと以外、実施例２と同様にして水道用ポリエチレン管に不断水分岐継手を取り付け、分岐管路用の口径の穿孔を図１に示した方法で行った。
【００４５】
（比較例４）
図６に示される実施例２の止水パッキンに替えて、内外面の閉環状突起１ｄ及び１ｅが無い止水パッキンを用いたこと以外、実施例２と同様にして水道用ポリエチレン管に不断水分岐継手を取り付け、分岐管路用の口径の穿孔を図１に示した方法で行った。
【００４６】
実施例２及び比較例３、４で得られた不断水分岐継手を取り付けた水道用ポリエチレン管について、先に実施した耐水圧試験を以下に示す曲げ耐水圧試験に変更して原管引張試験、周動応力試験と共に行った。試験結果は表２に示す。
【００４７】
４．曲げ耐水圧試験：
水道用ポリエチレン管と不断水分岐継手間に、管軸に対して３５°の曲げ応力を負荷した状態で２．５ＭＰａの水圧を加え、漏水の有無を観察した。
【００４８】
【表２】

【００４９】
実施例２の不断水分岐継手は、上記のいずれの試験に対しても、原管が材料破壊するまで、不断水分岐継手のズレもなく、漏水もないのに対して、厚さを厚くした比較例３の不断水分岐継手は、施工できず評価不能であり、内外面の閉環状突起が無い止水パッキンを用いた比較例４の不断水分岐継手は、曲げ応力に弱く、曲げ耐水圧試験において漏水が認められた。
【００５０】
（実施例３）
水道用ポリエチレン管に図７及び図１０に示される不断水分岐継手を取り付け、分岐管路用の口径の穿孔を図１に示した方法で行った。上記離脱防止リングを環状溝Ａに装着する際の弾性体としては、スチレン−ブタジエン共重合ゴムを用いた。なお、実施例３は、参考例である。
【００５１】
（実施例４）
水道用ポリエチレン管に図８及び図１１に示される不断水分岐継手を取り付け、分岐管路用の口径の穿孔を図１に示した方法で行った。上記離脱防止リング及び環状溝Ａの傾斜溝の楔状に拡径する傾斜角度は２０°のものが各々用いられた。なお、実施例４は、参考例である。
【００５２】
実施例３（参考例）及び実施例４（参考例）で得られた不断水分岐継手を取り付けた水道用ポリエチレン管について、実施例１で行った原管引張試験、周動応力試験及び耐水圧試験を、−５℃の環境条件で行った。試験結果は表３に示す。
【００５３】
【表３】

【００５４】
実施例３（参考例）及び実施例４（参考例）の不断水分岐継手は、上記のいずれの試験に対しても、原管が材料破壊するまで、不断水分岐継手のズレもなく、漏水もなかった。
【００５５】
本発明の不断水分岐継手は、上述のように構成されているので、既設配管の管軸及び周方向のいずれの負荷に対してもズレることがなく、分岐管路からも、既設配管との接続部からも漏水はなく、確実な離脱防止効果を奏し得るものである。しかも、本発明の不断水分岐継手は、上述のように、２分割型の継手本体を、既設配管の外周面を挟み込むようにボルト、ナットで緊締するだけで、仕切弁と穿孔機を用いて不断水で分岐管路を既設配管に設けることができ、極めて効率的に施工できるものであり、且つ、施工後の当該配管系統の下流地域の配管施設の洗浄が不要である等、施工の前後を通じて、殆ど利用者に迷惑をかけることがない。
【００５６】
又、本発明の不断水分岐継手は、上述のように構成されているので、分岐管路の耐水圧試験に対して、特に顕著な効果を奏し得るものである。
【００５７】
本発明の不断水分岐継手は、上述のように構成されているので、分岐管路が設けられている分割片にのみ止水パッキンを嵌着すればよく、使用部材の節減ができ、且つ、部材点数を低減し得るものであるので、不断水分岐継手の組立て工数が節減でき、製品のコスト低減に大きく貢献し得るものであるばかりか、上述する優れたズレ防止性、漏水防止性を奏し得るものである。
【図面の簡単な説明】
【図１】図１は、本発明の不断水分岐継手を用いて既設配管に分岐管路を設ける工程の説明図であって、穿孔機を取り付ける準備工程から、分岐工事を終了して、穿孔機を取り外した状態までの代表的な段階を（イ）〜（ニ）に一部切欠断面図で示す。
【図２】本発明の不断水分岐継手で用いられる止水パッキンの一例を示す斜視図である。
【図３】本発明の不断水分岐継手の一例を示す断面図である。
【図４】図３に示される不断水分岐継手のＩＶ−ＩＶ線における断面図である。
【図５】本発明の不断水分岐継手で用いられる離脱防止リング（２分割型の分割片）の一例を示す斜視図である。
【図６】本発明の不断水分岐継手で用いられる止水パッキン（２分割型）の一例を示す図面であって、図６（イ）は、図２と同じ状態を示す斜視図、図６（ロ）は、図６（イ）に示される止水パッキンのＶＩ−ＶＩ線における断面図、図６（ハ）は、貫通孔が設けられた分割片の内周面側を示す斜視図である。
【図７】本発明の不断水分岐継手の参考例を示す断面図である。
【図８】本発明の不断水分岐継手の他の参考例を示す断面図である。
【図９】本発明の不断水分岐継手の分岐管路受口が設けられていない継手本体の参考例の分割片を示す図面であって、図９（イ）は、上記分割片の内周面を示す平面図、図９（ロ）は、図９（イ）に示される分割片のＩＸ−ＩＸ線における断面図、図９（ロ）は、図９（イ）に示される分割片の斜視図である。
【図１０】本発明の不断水分岐継手の参考例につき、継手本体の環状溝Ａ及び離脱防止リングを各々管軸方向に切断した断面形状を示し、且つ、継手本体の上記に離脱防止リングを弾性体を介して装着する手段を模式的に示す説明図である。
【図１１】本発明の不断水分岐継手の参考例につき、継手本体の環状溝Ａ及び離脱防止リングの管軸方向に切断した断面形状を示し、且つ、継手本体の上記環状溝Ａに離脱防止リングを装着する手段を模式的に示す説明図である。
【符号の説明】
１止水パッキン
１ａ分割片２ａに装着される止水パッキン
１ｂ分割片２ｂに装着される止水パッキン
１ｃ貫通孔
１ｄ、１ｅ閉環状突起
２継手本体（２分割型）
２ａ分岐管受口３が設けられている分割片
２ｂ分岐管受口３が設けられていない分割片
３分岐管受口
３ａフランジ
４、４１離脱防止リング（２分割型）
４ａ管軸に平行な突条
４ｂ管軸に直交する突条
５放射状突起
６弾性体
７傾斜溝
３０既設配管
３０ａ被穿孔部
３０ｂ外周面
３１仕切弁
３２穿孔機
３３弁体
３４カッター
３５錐部
３６分岐管
Ａ環状溝Ａ
Ｂ環状溝Ｂ
Ｃ環状溝Ｃ [0001]
BACKGROUND OF THE INVENTION
The present invention relates to an uninterrupted water branch joint capable of performing branching work without cutting off existing piping when branching is provided in existing water piping or the like.
[0002]
[Prior art]
Conventionally, when a branch is provided in an existing water pipe, the pipe of the system that performs the branching work for a certain period of time is closed by closing the nearest valve provided in the existing pipe network, and the pipe of the system is shut off to perform the branching work. It was.
However, although it depends on the location of the branch construction, the water supply in a wide range of homes, business establishments, etc. is generally cut off, and its influence exceeds the range of simply inconvenient and causes various problems. To do.
Therefore, there was a problem that the construction cost would rise because a large amount of human resources, materials, and equipment were put into the branching work to perform the rushing work.
[0003]
[Problems to be solved by the invention]
The inventors have invented an uninterrupted water branch joint for branching without breaking the existing used pipe in the branching work of the existing used pipe, and filed as Japanese Patent Application No. 11-10209.
Furthermore, the present inventors can change the structure of the continuous water branch joint according to the present invention to quickly and easily perform the installation work of the continuous water branch joint in branch work, and during and after the work. The present inventors have found that the high water tightness of the branched portion can be achieved, thereby completing the present invention.
[0004]
The object of the present invention is to provide an uninterrupted water branch joint that can be quickly and easily installed when performing branching work without shutting off existing pipes. It is to reduce the construction cost.
[0007]
[Means for Solving the Problems]
According to the present invention , the outer peripheral surface of the existing pipe is surrounded by the short pipe member, and the existing pipe holding receptacle provided near the pipe end of the short pipe member is branched between the existing pipe holding receptacle. It consists of a joint main body with a branch pipe receptacle to be projected, a water stop packing and a detachment prevention ring, and the joint body is divided into two along the pipe axis of the existing pipe, An uninterrupted water branch joint in which an annular groove A with a separation prevention ring is provided on the peripheral surface, and an annular groove B with a water blocking packing is provided between the separation prevention ring attachment annular grooves A of the split pieces provided with branch pipe receptacles. there, the detachment prevention ring, and two ridges parallel to the tube axis of the existing pipe, on either side of the projecting strip, at least four protrusions are formed perpendicular thereto, is divided into two, mounted in the annular groove a of the split pieces of the joint body, frettage the split pieces to each other of the fitting body with bolts and nuts Doing, is pressed against the outer peripheral surface of the existing pipe, the waterproofing packing, and one waterproof packing through-hole is provided in the branch pipe opening equivalent portions and the other of the water stop which through holes are not provided Divided into two packings, one water-stopping packing is attached to the split piece of the joint body on the side having the annular groove B, and surrounds the outer peripheral surface of the existing piping together with the water-stopping packing attached to the other split piece An uninterrupted water branch joint is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.
[0012]
FIG. 1 is an explanatory view of branch construction of an existing pipe using the continuous water branch joint of the present invention. As shown in FIG. 1 (a), the existing pipe 30 such as a polyethylene pipe is connected to the water-stopping packing 1 and A continuous water branch joint having a structure in which a metal joint body 2 fitted with a separation preventing ring 4 is attached is used.
First, the continuous water branch joint of the present invention is attached to a predetermined branching position of the existing piping, then the gate valve 31 is attached to the joint body 2, and the punch 32 is attached to the gate valve 31. At this time, the valve element 33 of the gate valve 31 is kept open.
[0013]
Thereafter, as shown in FIG. 1B, the cutter 34 of the punching machine 32 is used to punch a predetermined branch portion of the existing pipe 30. At this time, in the drilled portion 30 a of the existing pipe 30, the cone portion 35 of the cutter 34 is stuck in a penetrating manner, and the drilled portion 30 a does not flow into the existing pipe 30.
[0014]
Thereafter, as shown in FIG. 1C, the cutter 34 of the punching machine 32 is returned to the original position, the valve body 33 is closed, and flowing water from the existing pipe 30 is prevented.
Then, as shown in FIG. 1 (d), the perforator 32 is removed, the branch pipe 36 is joined to the gate valve 31, and the branch pipe work is completed without water leakage from the existing pipe 30.
If the valve element 33 is opened after joining the branch pipe 36, water can be passed through the newly laid branch pipe.
Therefore, the water is cut off as in the prior art, the predetermined branch portion of the existing piping is cut and removed, and there is no need to join the T-shaped tube to the excised part. Therefore, it is possible to achieve a significant reduction in construction costs and a shortened construction period.
[0015]
FIG. 2 is a perspective view showing an example of the water stop packing 1 used in the continuous water branch joint of the present invention. FIG. 3 is a cross-sectional view of the existing pipe 30 to which the continuous water branch joint of the present invention is attached, vertically cut through the branch pipe 36 of the continuous water branch joint on a plane orthogonal to the tube axis of the existing pipe 30. FIG. 4 is a cross-sectional view of the existing pipe 30 to which the continuous water branch joint of the present invention shown in FIG. The water stop packing 1 of FIG. 2 has shown the state which extracted only the water stop packing 1 from the said unaltered water branch joint of FIG.3 and FIG.4 in the pipe-axis direction.
[0016]
That is, the water-stop packing 1a on the upper side in FIG. 2 is attached to the annular groove B of the split piece 2a provided with the branch pipe receiving port 3, and is in close contact with the outer peripheral surface 30b of the existing pipe 30. A through hole 1c is provided in a portion corresponding to the opening of the pipe 36 and constitutes one element of the base of the branch pipe 36, and the water blocking packing 1a attached to the peripheral edge of the through hole 1c is interposed therethrough. Thus, the annular groove B of the divided piece 2b in which the inner peripheral surface of the divided piece 2a around the opening of the branch pipe 36 and the outer peripheral surface 30b of the existing pipe 30 are water-tightly filled and the branch pipe receiving port 3 is not provided. The entire surface of the water-stopping packing 1b is in close contact with the outer peripheral surface of the existing pipe 30, and the side edge of the water-stopping packing 1b is abutted against the side edge of the water-stopping packing 1a. The outer peripheral surface 30b of the pipe 30 is surrounded.
[0017]
Next, as shown in FIG. 3, when the

split pieces

2a and 2b are tightened with bolts 11 and nuts 12 at flanges provided on the

split pieces

2a and 2b, the water-stopping

packings

1a and 1b are The two flanges 3a are in close contact with each other at their abutting surfaces, surround the outer peripheral surface 30b of the existing pipe 30, and are sandwiched between the inner peripheral surface of the

split pieces

2a and 2b and the outer peripheral surface 30b of the existing pipe 30. The branch pipe receiving port 3 can be formed in the existing pipe 30 in a watertight manner.
[0018]
Thus, when branch water flows from the branch pipe receiving port 3 to which the

water stop packings

1a and 1b are attached, the water stop packing 1a exposed in the gap between the joint body 2 and the outer peripheral surface 30b of the existing pipe 30 is applied. loaded water pressure in the through hole 1 a inner wall surface being drilled, water-tightness of the gap so pushed into the gap further enhanced, it is possible to ensure the integrity of the waterproofing.
[0019]
As shown in FIG. 4, on the inner peripheral surface of the joint body 2 composed of the

split pieces

2 a and 2 b, on both sides of the branch pipe receiving port 3 with the flange 3 a in a direction perpendicular to the pipe axis of the existing pipe 30. Two annular grooves A are provided. In the annular groove A, two protrusions 4a parallel to the tube axis of the existing pipe 30 shown in FIG. 5 and both sides of the protrusions 4a are orthogonal to each other. The separation prevention ring 4 provided with at least four protrusions 4b is divided into two parts and attached to the respective divided

pieces

2a and 2b, and the two two-part separation prevention rings 4 each have an outer peripheral surface 30b of the existing pipe 30. Surrounding and sandwiched between the inner peripheral surface of the joint main body 2 and the outer peripheral surface 30b of the existing pipe 30, the two protrusions 4a contribute to prevention of displacement with respect to the stress in the circumferential direction of the existing pipe 30, At least four of the protrusions 4b prevent the displacement of the existing pipe 30 against stress in the tube axis direction. Contribute to, it is those which express anti-separation action from the outer peripheral surface 30b of the existing pipe 30 of the joint body 2 I both phases 俟.
[0020]
FIG. 6 (a) is a perspective view showing the water-stopping

packings

1a and 1b used in the continuous water branch joint of the present invention. In FIG. 6 (a), the water stop packing 1a is fitted into the two divided annular grooves A provided on the inner peripheral surface of the split piece 2a of the joint body 2 shown in FIG. Similarly, it is a water-stopping packing that is fitted into an annular groove A that is divided into two provided on the inner peripheral surface of the divided piece 2b. The waterstop packing 1a is provided with a through hole 1c in a portion corresponding to the branch pipe 36, and closed annular ridges 1d and 1e are provided on both inner and outer surfaces of the periphery of the through hole 1c.
[0021]
6 (b) is a cross-sectional view taken along line VI-VI of the water-stopping packing 1 shown in FIG. 6 (a), and the closed annular ridges 1d and 1e provided on both the inner and outer surfaces of the water-stopping packing 1. FIG. However, it has shown the state currently protruded by both surfaces of the existing piping 30 outer peripheral surface 30b and the joint main body 2 inner peripheral surface.
[0022]
FIG. 6 (c) is a perspective view showing the state of the inner peripheral surface of the water stop packing 1a shown in FIG. 6 (a), in which only the water stop packing 1a is taken out. It is drawn so that the state in which the closed annular ridge 1e protruding from the inner peripheral surface of the peripheral edge of the hole 1c is protruding can be seen.
[0023]
As shown in FIGS. 6 (a) to 6 (c), the closed annular ridges 1d and 1e are provided on both the inner and outer surfaces of the water-stopping packing 1a, so that the thickness variation of the water-stopping packing 1a is slightly larger. Even if there is a slight scratch on the surface of the water-stopping packing 1a, the

split pieces

2a and 2b of the joint body 2 are tightened, and the water-stopping

packings

1a and 1b are connected to the outer peripheral surface 30b of the existing pipe 30. And the inner peripheral surface of the joint body 2, the closed annular protrusions 1 d and 1 e pass through the through hole 1 c corresponding to the branch pipe 36 to the existing pipe 30 outer peripheral surface 30 b and the joint main body 2 inner peripheral surface. The water can be surely stopped on both sides.
[0024]
FIG. 7 is a cross-sectional view of a surface of the short pipe member attached to the branch pipe receiving port 3 and the existing pipe 30 and including the orthogonal pipe axis, according to a reference example of the continuous water branch joint of the present invention. The position of the existing pipe 30 to which the joint is attached is indicated by a two-dot chain line. In FIG. 7, a water stop packing mounting curved groove C is formed on the inner peripheral surface of the peripheral portion excluding the opening of the branch pipe 36 between the annular grooves A of the split piece 2 a provided with the branch pipe receiving port 3. . The peripheral edge of the curved groove C is edged with the same curved surface as the inner peripheral surface other than the annular groove A and the curved groove C. The curved groove C has a through hole 1c corresponding to the branch pipe opening. The water-stop packing 1a that has been drilled is attached.
[0025]
As described above, when the

split pieces

2a and 2b are tightened with bolts 11 and nuts 12 at the flanges provided on the

respective split pieces

2a and 2b, the water blocking packing 1a is connected to the joint body 2 and the existing pipe 30. Among the gaps between the outer peripheral surface 30b of the curved groove C, the inner portion bordered by the peripheral edge of the curved groove C, the other joint body 2 and the butted surface of the outer peripheral surface 30b of the existing pipe 30 can be watertightly insulated. It will be a thing. Therefore, in this continuous water branch joint, it is not always necessary to interpose a water-stopping packing between the inner peripheral surface of the split piece where the branch pipe is not provided and the outer peripheral surface 30b of the existing pipe 30. Of course, the packing having the same performance may be used as a cushioning material for the purpose of ensuring the tightness of the divided pieces.
[0026]
In the reference example of the present invention , the edge of the peripheral edge of the curved groove C includes an inner part edged by the peripheral edge of the curved groove C, the other joint body 2 and the butted surface of the outer peripheral surface 30b of the existing pipe 30. For the purpose of watertight insulation, the dividing piece 2b provided with the branch pipe receiving port 3 is bordered with the other divided piece 2b and the abutting surface portion of the divided piece provided with the branch pipe receiving port 3 Although it may be provided on the 2a side as described above, as shown in FIG. 8, the curved groove C of the split piece provided with the branch pipe receptacle 3 is provided with the branch pipe receptacle 3. It is open on the side of the abutting surface with the non-divided piece, without the border surface, and is provided on the divided piece 2b where the branch pipe receiving port 3 is not provided. It may be in the form of matching. In any case, it is outside the scope of the present invention that the annular groove C is substantially bordered.
[0027]
FIG. 9 is a drawing showing a divided piece 2b in which the branch pipe receiving port 3 of the joint body 2 is not provided according to a reference example of the continuous water branch joint of the present invention, and FIG. FIG. 9B is a cross-sectional view taken along the line IX-IX of the segment 2b shown in FIG. 9A. FIG. 9C is a perspective view drawn to make the structure of the annular groove and the like three-dimensionally easy to understand. In FIG. 9, the inner peripheral surface between two annular grooves A is provided with protrusions 5 arranged radially at 45 ° to each other. Since members other than the divided piece not provided with the branch pipe receiving port 3 are the same as the continuous water branch joint of the present invention, their description is omitted.
[0028]
As described above, when the

split pieces

2a and 2b are fastened with bolts 11 and nuts 12 at the flanges provided respectively, the water-stopping packing 1a is an inner portion edged at the peripheral edge of the curved groove C. 2, the branch pipe (receiving port 3) path, the joint body 2, and the gap between the butted surfaces of the outer peripheral surface 30 b of the existing pipe 30 can be watertightly insulated, and the branch attached to the outer peripheral surface 30 b of the existing pipe 30. The joint contributes to prevention of misalignment against various stresses concentrated in the circumferential direction and the pipe axis direction of the existing pipe 30 by the radially arranged projections 5, and the radially arranged projections 5 together The effect of preventing the separation from the outer peripheral surface 30b of the existing pipe 30 of the main body 2 is exhibited.
[0029]
FIG. 10 is an explanatory view schematically showing means for attaching the separation preventing ring 4 to the annular groove A of the joint body 2 according to a reference example of the continuous water branch joint of the present invention. In FIG. 10, a separation preventing ring 4 is attached to an annular groove A provided on the inner peripheral surface of the joint body 2 via an elastic body 6. The elastic body 6 used for the continuous water branch joint is not particularly limited, and examples thereof include a spring elastic body such as a leaf spring and a coil spring, and a rubber elastic body such as a crosslinked rubber.
[0030]
As described above, when the

split pieces

2a and 2b are fastened with bolts 11 and nuts 12 at flanges provided respectively, the separation preventing ring 4 is pressed against the outer peripheral surface 30b of the existing pipe 30 by the elastic body 6. In combination with the action of the pipe shaft of the existing pipe 30 and the circumferential protrusion 5 provided on the inner peripheral surface of the separation preventing ring 4, the outer peripheral surface 30 b of the existing pipe 30 is securely held, This prevents the displacement of the pipe 30 in the pipe axis and the circumferential direction, and remarkably expresses the effect of preventing the detachment from the outer peripheral surface 30 b of the existing pipe 30 of the joint body 2.
[0031]
FIG. 11 is a partial cross-sectional view showing the annular groove A and the separation preventing ring 4 of the joint main body 2 in a plane orthogonal to the respective circumferential directions, according to a reference example of the continuous water branch joint of the present invention , The annular groove A is composed of inclined grooves 7 each having a diameter increased in a wedge shape in the tube axis direction of the existing pipe 30 toward the branch pipe opening of the joint body 2, and the separation preventing ring 4 attached to the annular groove A is The ring-shaped groove A includes a two-part detachment preventing ring 41 having a pointed end that is movable so as to be movable in the inclined groove 7 and expanded in a wedge shape.
[0032]
If the inclination angle of the annular groove A expanded to a wedge shape is too small, the effect of the inclined groove 7 does not appear. If the inclination angle is too large, the separation preventing ring 41 slides against sudden stress and the separation preventing effect is lost. Therefore, it is preferably 5 ° to 45 °, more preferably 15 ° to 30 °.
Further, the inclination angle of the detachment prevention ring 41 attached to the annular groove A to be expanded in a wedge shape is preferably 5 ° to 45 °, more preferably 15 ° to 30 °, like the annular groove A. .
[0033]
As described above, when the

split pieces

2a and 2b are fastened with the bolts 11 and the nuts 12 at the flanges provided respectively, the separation preventing ring is pressed against the outer peripheral surface 30b of the existing pipe 30 and the inside of the separation preventing ring 41. Two annular grooves A that differ in the direction in which the diameter is expanded in a wedge shape together with the gripping action of the pipe shaft and the

circumferential projections

4a and 4b of the existing pipe 30 provided on the peripheral surface. By using the two detachment prevention rings 41, it is possible to exert a remarkable detachment prevention effect particularly on the stress in the pipe axis direction of the existing piping 30.
[0034]
Example 1
The continuous water branch joint of the present invention shown in FIGS. 2 to 5 was attached to a polyethylene pipe for water supply, and the diameter of the branch pipe for 36 passages was drilled by the method shown in FIG.
[0035]
(Comparative Example 1)
Instead of the ridges provided on the inner peripheral surface of the separation preventing ring 4 of Example 1 shown in FIG. 5, there are no two ridges 4a in the pipe axis direction of the polyethylene pipe for water supply, and they are continuous in the circumferential direction. A continuous water branch joint is attached to a polyethylene pipe for water supply in the same manner as in Example 1 except that a detachment prevention ring provided with only four annular protrusions 4b is used, and a bore for a branch pipe is drilled. This was performed by the method shown in FIG.
[0036]
(Comparative Example 2)
Of the ridges provided on the inner peripheral surface of the separation preventing ring of Example 1 shown in FIG. 5, four to two ridges 4b provided on both sides of the polyethylene pipe for water pipe perpendicular to the tube axis are provided. Except that it was reduced to a book, a continuous water branch joint was attached to a polyethylene pipe for water supply in the same manner as in Example 1, and the diameter of the branch pipe was perforated by the method shown in FIG.
[0037]
About the polyethylene pipe for water supplies which attached the unrestricted water branch joint obtained in Example 1 and Comparative Examples 1 and 2, the original pipe tensile test, the circumferential dynamic stress test, and the water pressure resistance test were done by the method shown below. The test results are shown in Table 1.
[0038]
1. Original pipe tensile test:
A tensile force in the direction of the pipe axis was applied between the polyethylene pipe for water supply and the continuous water branch joint at a tensile speed of 100 mm / min, and the presence or absence of displacement or the form of fracture was observed.
[0039]
2. Circumferential stress test:
The presence or absence of a shift between the polyethylene pipe for water supply and the continuous water branch joint when a torque of 2000 kgf-cm was applied was observed.
[0040]
3. Water pressure test:
The obtained branch pipe was subjected to a water pressure test according to a conventional method, and the presence or absence of water leakage or the form of destruction was observed.
[0041]
[Table 1]

[0042]
The continuous water branch joint of Example 1 has no misalignment of the continuous water branch joint and no leakage until the original pipe breaks the material for any of the above tests, The uninterrupted water branch joint of Comparative Example 1 using the separation preventing ring having no two protrusions in the pipe axis direction is displaced with respect to the stress in the circumferential direction, and there are four protrusions in the peripheral method of the polyethylene pipe for water supply. The uninterrupted water branch joint of Comparative Example 1 which is less than the above is misaligned with respect to the stress in the pipe axis direction of the polyethylene pipe for water supply.
[0043]
(Example 2)
The continuous water branch joint of the present invention using the water-stopping packing shown in FIG. 6 was attached to a polyethylene pipe for water supply, and the diameter of the branch pipe was perforated by the method shown in FIG.
[0044]
(Comparative Example 3)
In place of the water-stopping packing of the second embodiment shown in FIG. 6, the same procedure as in the second embodiment is used except that the water-stopping packing having no inner and outer closed annular projections 1 d and 1 e and having a thickness increased by 15% is used. A continuous water branch joint was attached to a polyethylene pipe for water supply, and the diameter of the branch pipe was pierced by the method shown in FIG.
[0045]
(Comparative Example 4)
In place of the water-stopping packing of the second embodiment shown in FIG. 6, water-free polyethylene pipes are continuously watered in the same manner as in the embodiment 2 except that the water-stopping packing without the closed annular projections 1d and 1e on the inner and outer surfaces is used. A branch joint was attached, and the diameter of the branch pipe was drilled by the method shown in FIG.
[0046]
For polyethylene pipes for waterworks to which the unrestricted water branch joints obtained in Example 2 and Comparative Examples 3 and 4 were attached, the previous water pressure test was changed to the bending water pressure test shown below, and the original pipe tensile test, Along with the circumferential stress test. The test results are shown in Table 2.
[0047]
4). Bending water pressure test:
A water pressure of 2.5 MPa was applied between a polyethylene pipe for water supply and a continuous water branch joint with a bending stress of 35 ° applied to the pipe axis, and the presence or absence of water leakage was observed.
[0048]
[Table 2]

[0049]
In any of the above tests, the continuous water branch joint of Example 2 was thickened while there was no displacement of the continuous water branch joint and no water leakage until the original pipe broke the material. The constant water branch joint of Comparative Example 3 cannot be constructed and cannot be evaluated, and the constant water branch joint of Comparative Example 4 using a water stop packing without a closed annular protrusion on the inner and outer surfaces is weak against bending stress and has a bending water pressure resistance. Water leakage was observed in the test.
[0050]
(Example 3)
The continuous water branch joint shown in FIGS. 7 and 10 was attached to a polyethylene pipe for water supply, and the diameter of the branch pipe was perforated by the method shown in FIG. Styrene-butadiene copolymer rubber was used as the elastic body when the above-mentioned separation preventing ring was mounted in the annular groove A. Example 3 is a reference example.
[0051]
Example 4
The continuous water branch joint shown in FIGS. 8 and 11 was attached to a polyethylene pipe for water supply, and the diameter of the branch pipe was perforated by the method shown in FIG. The inclination angle for expanding the wedge-shaped diameter of the above-described separation preventing ring and the inclined groove of the annular groove A was 20 °. Example 4 is a reference example.
[0052]
About the polyethylene pipe for water supply which attached the unrestricted water branch joint obtained in Example 3 (reference example) and Example 4 (reference example) , the original pipe tensile test, the circumferential dynamic stress test, and water pressure resistance which were performed in Example 1 The test was conducted at -5 ° C environmental conditions. The test results are shown in Table 3.
[0053]
[Table 3]

[0054]
The non-breaking water branch joints of Example 3 (reference example) and Example 4 (reference example) are free from any misalignment of the non-breaking water branch joint until the material of the original pipe breaks against any of the above tests. There was not.
[0055]
Since the continuous water branch joint of the present invention is configured as described above, it does not deviate with respect to any load in the pipe axis and the circumferential direction of the existing pipe, and from the branch pipe, There is no water leakage from the connecting portion, and a reliable detachment preventing effect can be achieved. In addition, the continuous water branch joint of the present invention, as described above, uses a gate valve and a perforator only by tightening the two-part joint body with bolts and nuts so as to sandwich the outer peripheral surface of the existing pipe. Before and after construction, branch pipes can be installed in existing pipes with unrestricted water, can be constructed very efficiently, and there is no need to clean piping facilities downstream of the piping system after construction. Through this, there is almost no inconvenience to users.
[0056]
In addition, since the continuous water branch joint of the present invention is configured as described above, it can exert a particularly remarkable effect on the water pressure resistance test of the branch pipe.
[0057]
Since the uninterrupted water branch joint of the present invention is configured as described above, it is only necessary to fit the water-stopping packing to the split piece provided with the branch pipe line, and the use member can be saved, and Since the number of parts can be reduced, it is possible not only to reduce the assembly man-hours of the continuous water branch joint, and to greatly contribute to the cost reduction of the product, but also exhibits the above-described excellent slip prevention and water leakage prevention properties. To get.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram of a process for providing a branch pipe to an existing pipe using the continuous water branch joint of the present invention. The typical steps up to the state where the machine is removed are shown in (a) to (d) in partially cutaway sectional views.
FIG. 2 is a perspective view showing an example of a water stop packing used in the continuous water branch joint of the present invention.
FIG. 3 is a cross-sectional view showing an example of a continuous water branch joint of the present invention.
4 is a cross-sectional view taken along line IV-IV of the continuous water branch joint shown in FIG.
FIG. 5 is a perspective view showing an example of a separation preventing ring (two-divided split piece) used in the continuous water branch joint of the present invention.
6 is a view showing an example of a water-stopping packing (two-split type) used in the continuous water branch joint of the present invention, and FIG. 6 (a) is a perspective view showing the same state as FIG. (B) is a cross-sectional view taken along the line VI-VI of the water blocking packing shown in FIG. 6 (A), and FIG. 6 (C) is a perspective view showing the inner peripheral surface side of the split piece provided with a through hole. is there.
FIG. 7 is a cross-sectional view showing a reference example of the continuous water branch joint of the present invention.
FIG. 8 is a cross-sectional view showing another reference example of the continuous water branch joint of the present invention.
FIG. 9 is a drawing showing a split piece of a reference example of a joint body that is not provided with a branch pipe port of the continuous water branch joint of the present invention, and FIG. 9 (a) shows the inner periphery of the split piece; 9B is a cross-sectional view taken along the line IX-IX of the divided piece shown in FIG. 9A, and FIG. 9B is a sectional view of the divided piece shown in FIG. It is a perspective view.
FIG. 10 shows a cross-sectional shape of the joint body according to a reference example of the continuous water branch joint of the present invention, in which the annular groove A and the separation prevention ring of the joint body are cut in the direction of the pipe axis, and the separation prevention ring is provided above the joint body. It is explanatory drawing which shows typically the means to mount | wear via an elastic body.
FIG. 11 shows a cross-sectional shape of the annular groove A of the joint main body and the pipe of the separation preventing ring cut in the pipe axis direction according to a reference example of the continuous water branch joint of the present invention, and prevention of separation in the annular groove A of the joint main body. It is explanatory drawing which shows the means to mount | wear a ring typically.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water stop packing 1a Water stop packing 1b attached to the division | segmentation piece 2a Water stop packing 1c attached to the division | segmentation piece 2b Through-hole 1d, 1e Closed annular protrusion 2 Joint main body (2 division type)
2a Divided piece 2b provided with branch pipe receiving port 3 Divided piece 3 provided with no branch pipe receiving port 3 Branch pipe receiving port 3a Flange 4, 41 Detachment prevention ring (two-split type)
4a Projection 4b parallel to tube axis Projection 5 orthogonal to tube axis 5 Radial projection 6 Elastic body 7 Inclined groove 30 Existing pipe 30a Perforated part 30b Outer peripheral surface 31 Gate valve 32 Perforator 33 Valve body 34 Cutter 35 Conical part 36 Branch pipe A Annular groove A
B annular groove B
C annular groove C

Claims

An existing pipe holding receptacle provided in the vicinity of the pipe end of the short pipe member, and a branch pipe receptacle to be branched between the existing pipe holding receptacle, which surrounds the outer peripheral surface of the existing pipe with a short pipe member The joint body consists of a joint body, a waterproof seal and a detachment prevention ring. The joint body is divided into two along the pipe axis of the existing pipe, and the detachment prevention ring is formed on the inner peripheral surface of the existing pipe grip receiving port. An uninterrupted water branch joint in which a mounting annular groove A is provided, and a water blocking packing mounting annular groove B is provided between the ring separation annular mounting annular grooves A of the split pieces provided with branch pipe receptacles ,
The detachment prevention ring, and two ridges parallel to the tube axis of the existing pipe, on either side of the projecting strip, at least four protrusions are formed perpendicular thereto, it is divided into two, the joint body mounted in the annular groove a of the split piece, by tightening the split pieces to each other of the fitting body with bolts and nuts, it is pressed against the outer peripheral surface of the existing pipe,
The water-stopping packing is divided into two parts, one water-stopping packing provided with a through hole in a portion corresponding to the branch pipe opening and the other water-stopping packing provided with no through-hole. An uninterrupted water branch joint , which is attached to the split piece of the joint body on the side having the annular groove B and surrounds the outer peripheral surface of the existing pipe together with the water stop packing attached to the other split piece .