JP2004084719A

JP2004084719A - Remainder pipe joining method and remainder pipe joining structure

Info

Publication number: JP2004084719A
Application number: JP2002243641A
Authority: JP
Inventors: Kotaro Morikawa; 森川　晃太郎
Original assignee: Waterworks Technology Development Organization Co Ltd
Current assignee: Waterworks Technology Development Organization Co Ltd
Priority date: 2002-08-23
Filing date: 2002-08-23
Publication date: 2004-03-18
Anticipated expiration: 2022-08-23
Also published as: JP4261842B2

Abstract

<P>PROBLEM TO BE SOLVED: To easily use a remainder pipe as a socket pipe of a pipe joint structure by carrying the remainder pipe in other execution site as it is by simplifying the remainder pipe control, and facilitating the working at an execution site. <P>SOLUTION: One end part of a remainder cut pipe 4 is inserted in and connected to a socket pipe part 3 having a connecting means 2 to a piping appliance 1 such as a fluid pipe. A space between an inner circumferential surface of the socket pipe part 3 and an outer circumferential surface 4a of an inserted pipe part 4A of the remainder pipe 4 is sealed by an elastic sealant 5 fitted to the socket pipe part 3. The inserted pipe part 4A of the remainder pipe 4 is lock-fixed to the socket pipe part 3 by a locking means 7 provided on the socket pipe part 3. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、水道工事等の配管工事現場に搬入された規定寸法の直管状の流体管を施工現場で実測された配管寸法に基づいて切断する際に発生する残管の再生技術に関する。
【０００２】
【従来の技術】
水道工事等の配管工事を考察すると、工事の大部分は、設計に基づいて現場に搬入された各種の配管器材を所定の手順で接続することにより行なわれるが、一部は、施工現場毎に異なる配管寸法差に基づいて、現場に搬入された直管状の流体管を切断し、この切り管を接続する工法が採られている。
【０００３】
そして、配管寸法に切断された使用対象の切り管の切断端部を、管継手構造の挿口管部に構成するためには、例えば、図９、図１０に示すように、施工現場において、切り管の切断端部に、先端側ほど小径となる挿入ガイド用のテーパー面５２と、受口管３の内周面に嵌合保持されているロックリング５３と管軸芯Ｘ方向から当接するＣ字状の抜止め用リング５４を装着するための環状の取付け溝５５とを切削加工したのち、この切り管の取付け溝５５に、拡径操作されたＣ字状の抜止め用リング５４を装着し、この抜止め用リング５４の両端部とそれらに亘って架け渡される外れ止め用の結合ピース５６とを、それぞれ冶具にて所定姿勢に固定した状態でリベット５７により固定連結する方法が採られている。
【０００４】
また、他方の残管は、切断加工箇所の施工現場では使用されることがなく、他の施工現場で使用するためには、その搬入先で上述と同様な加工を施す必要がある。
【０００５】
【発明が解決しようとする課題】
切り管に用いられる直管状の流体管としては、その管軸芯方向のいずれの位置で切断されても、切断箇所の外径及び厚みが許容値内に入る遠心鋳造により製作された鋳鉄管等の高級な流体管が用いられているが、残管の寸法が千差万別であり、しかも、残管には、取付け溝５５の切削加工に適した厚みの大きな第１種管とそれよりも厚みの薄い第３種管といった厚みの異なる複数種類のものが存在するため、各施工現場で要求されている継手構造に適した管種を選別する必要があり、その結果、残管管理が非常に煩雑化してコストが掛かるため、残管４を再利用せずにそのまま廃棄しているのが現状である。
また、残管に、抜止め用リング５４を装着するための環状の取付け溝５５を切削加工する場合では、施工現場で上述のような煩雑な加工を施す必要があり、特に、抜止め用リング５４の装着不良が生じると、所期の離脱防止効果が大きく低下するため、取付け溝５５を高精度に加工する必要があるとともに、抜止め用リング５４の装着にも多くの手間が必要であるため、残管４の再生コストが高騰化するとともに、加工期間も長くなり、この面においても残管４の再利用を妨げる要因になっている。
【０００６】
本発明は、上述の実状に鑑みて為されたものであって、その主たる課題は、残管管理の簡素化と施工現場での加工の容易化を図ることにより、残管を他の施工現場にそのまま搬入して管継手構造の挿口管として容易に用いることのできる有用な残管継手方法及び残管継手構造を提供する点にある。
【０００７】
【課題を解決するための手段】
本発明の請求項１による残管継手方法の特徴構成は、切断された残管の一側端部を、流体管等の配管機材に対する連結手段を備えた受口管部に挿入接続し、この受口管部の内周面と残管の挿入管部分の外周面との間を、受口管部に装着される弾性シール材で密封するとともに、前記受口管部に設けた抜止め手段により、残管の挿入管部分を受口管部に抜止め固定する点にある。
【０００８】
上記特徴構成によれば、流体管の切断に伴って発生した厚みの異なる複数種類直管状の残管を、管継手構造の挿口管として用いる場合でも、厚みに関係なく残管の一側端部を、流体管等の配管機材に対する連結手段を備えた受口管部に挿入接続したのち、受口管部に設けた抜止め手段により、残管の挿入管部分を受口管部に抜止め固定するだけであるため、従来のように残管をそれの厚みに応じて選別する必要が無く、しかも、残管に対する加工としても、受口管部に装着される弾性シール材が損傷しないように、また、残管の一側端部をスムースに挿入できるように、残管の一側端部に対してバリ取りや面取り等の簡易な加工を施すだけで済む。
【０００９】
従って、残管の管理が極めて簡素になり、しかも、残管に対する加工としてもバリ取りや面取り等の簡易な加工だけで済むので、他の施工現場にそのまま搬入して管継手構造の挿口管として用いることができ、残管の再利用をコスト面及び期間面で有利に実施することができる。
【００１０】
本発明の請求項２による残管継手方法の特徴構成は、前記残管の一側端部に、先端側ほど小径で、かつ、基端側が残管の外径と同一又はほぼ同一となるテーパー状の挿入ガイド面を備えた挿入ガイド部材を管軸芯方向から嵌合装着したのち、この挿入ガイド部材の装着側から残管を受口管部に挿入接続する点にある。
【００１１】
上記特徴構成によれば、残管の一側端部に対して挿入ガイド部材を管軸芯方向から嵌合装着することにより、この挿入ガイド部材の挿入ガイド面を利用して、受口管部への挿入接続操作をスムースに行うことができるから、残管の一側端部に面取り加工を施す必要がなく、残管の再利用コストの低廉化及び工期の短縮化を促進することができる。
【００１２】
本発明の請求項３による残管継手方法の特徴構成は、切断された残管に、受口管部の内周面と残管の外周面との間を密封する弾性シール材と、該弾性シール材を管軸芯方向から押圧して密封状態にまで圧縮する押輪とを外装し、残管の一側端部を受口管部に挿入接続するとともに、押輪と受口管部とを管軸芯方向から締付け固定し、更に、押輪の周方向複数箇所に装着された抜止め部材の各々を、残管の外周面に喰込む状態に設定し、各抜止め部材と押輪との間に設けた喰込み誘導手段により、両管部の相対離脱移動に連れて抜止め部材を管径方向内方側に喰込み移動させることを特徴とする点にある。
【００１３】
上記特徴構成によれば、流体管の切断に伴って発生した厚みの異なる複数種類の直管状の残管を、管継手構造の挿口管として用いる場合でも、厚みに関係なく受口管部に挿入接続された残管に、弾性シール材と押輪とを外装して、押輪と受口管部とを管軸芯方向から締付け固定操作することにより、受口管部の内周面と残管の外周面との間を密封する弾性シール材を密封状態にまで押圧圧縮させるとともに、押輪の周方向複数箇所に装着された抜止め部材の各々を、残管の外周面に喰込む状態に設定することにより、地震や不等沈下等に起因して両管部に引き抜き方向の外力が作用したときには、各抜止め部材と押輪との間に設けた喰込み誘導手段により、両管部の相対離脱移動に連れて抜止め部材が管径方向内方側に喰込み移動するから、両管部の離脱防止効果を高めることができる。
【００１４】
それ故に、従来のように残管をそれの厚みに応じて選別する必要が無く、しかも、残管に対する加工としても、残管に外装される弾性シール材が損傷しないように、また、残管の一側端部をスムースに挿入できるように、残管の一側端部に対してバリ取りや面取り等の簡易な加工を施すだけで済む。
【００１５】
従って、残管の管理が極めて簡素になり、しかも、残管に対する加工としても、バリ取りや面取り等の簡易な加工だけで済むので、他の施工現場にそのまま搬入して、耐震性のある管継手構造の挿口管として用いることができ、残管の再利用をコスト面及び期間面で有利に実施することができる。
【００１６】
本発明の請求項４による残管継手構造の特徴構成は、受口管部に、切断された残管の一側端部を挿入接続し、この残管に、受口管部の内周面と残管の外周面との間を密封する弾性シール材と、該弾性シール材を管軸芯方向から押圧して密封状態にまで圧縮する押輪とを外装し、押輪と受口管部とを管軸芯方向から締付け固定する締結手段を設けるとともに、押輪の周方向複数箇所の各々には、残管の外周面に喰込み可能な喰込み突起を備えた抜止め部材を装着するとともに、各抜止め部材と押輪との間には、両管部の相対離脱移動に連れて抜止め部材を管径方向内方側に喰込み移動させる喰込み誘導手段を設けた点にある。
【００１７】
上記特徴構成によれば、流体管の切断に伴って発生した厚みの異なる複数種類の直管状の残管を、管継手構造の挿口管として用いる場合でも、厚みに関係なく受口管部に挿入接続された残管に、弾性シール材と押輪とを外装して、締結手段による押輪と受口管部との管軸芯方向からの締付け固定操作により、受口管部の内周面と残管の外周面との間を密封する弾性シール材を密封状態にまで押圧圧縮させるとともに、押輪の周方向複数箇所に装着された抜止め部材の各々を、残管の外周面に喰込む状態に設定することにより、地震等に起因して両管部に引き抜き方向の外力が作用したときには、各抜止め部材と押輪との間に設けた喰込み誘導手段により、両管部の相対離脱移動に連れて抜止め部材が管径方向内方側に喰込み移動するから、両管部の離脱防止効果を高めることができる。
【００１８】
それ故に、従来のように残管をそれの厚みに応じて選別する必要が無く、しかも、残管に対する加工としても、残管に外装される弾性シール材が損傷しないように、また、残管の一側端部をスムースに挿入できるように、残管の一側端部に対してバリ取りや面取り等の簡易な加工を施すだけで済む。
【００１９】
従って、残管の管理が極めて簡素になり、しかも、残管に対する加工としても、バリ取りや面取り等の簡易な加工だけで済むので、他の施工現場にそのまま搬入して、耐震性のある管継手構造の挿口管として用いることができ、残管の再利用をコスト面及び期間面で有利に実施することができる。
【００２０】
本発明の請求項５による残管継手構造の特徴構成は、前記喰込み突起の喰込み先端縁が、管軸芯方向視において残管の挿入管部分の外周面の半径と同一又は略同一の半径で弧状に形成されている点にある。
【００２１】
上記特徴構成によれば、喰込み突起の喰込み先端縁が、残管の挿入管部分の外周面の半径と同一の半径で弧状に形成されている場合には、喰込み突起の喰込み先端縁全体が、残管の外周面に対して均等に喰込む。
【００２２】
また、喰込み突起の喰込み先端縁が、残管の挿入管部分の外周面の半径よりも僅かに大きな半径で弧状に形成されている場合には、喰込み突起の喰込み先端縁の周方向中央部が残管の挿入管部分の外周面に最初に喰込むものの、喰込み先端縁における周方向中央部での喰込み量と周方向両端部での喰込み量との差を小さくすることができる。
【００２３】
更に、喰込み突起の喰込み先端縁が、残管の挿入管部分の外周面の半径よりも僅かに小さな半径で弧状に形成されている場合には、喰込み突起の喰込み先端縁の周方向両端部が残管の挿入管部分の外周面に最初に喰込むため、喰込み先端縁の周方向中央部が挿口管部の外周面に最初に喰込む場合に比較して、喰込み力を周方向で分散させ易く、しかも、喰込み先端縁における周方向両端部での喰込み量と周方向中央部での喰込み量との差を小さくすることができる。
【００２４】
従って、各喰込み突起の喰込み先端縁の形状を残管の挿入管部分の外径に基づいて改造するだけの経済的な改造をもって、所定の離脱防止機能を確実に発揮させながらも、残管の内周面に施されている防蝕用ライニング層に割れや剥離等の損傷が発生することを良好に抑制することができる。
【００２５】
【発明の実施の形態】
〔第１実施形態〕
図１〜図３は、水道管やガス管等の流体管の配管系に用いられる残管継手構造を示し、流体管や仕切弁等の配管機材１に対する連結手段２を備えた鋳鉄製の受口管部３に、例えば、日本工業規格（ＪＩＳ）等で規定された遠心鋳造により製作された鋳鉄製の直管状の流体管を施工現場で切断加工することに伴って発生した残管４の一側端部を、管軸芯Ｘ方向から挿入接続するとともに、受口管部３の内周面３ａには、残管４の挿入管部分４Ａの外周面４ａとの間を密封するための合成樹脂製の弾性シール材５を嵌合保持する環状のシール保持溝６が形成され、更に、受口管部３には、残管４の挿入管部分４Ａを受口管部３に抜止め固定する抜止め手段７が設けられている。
【００２６】
前記連結手段２は、受口管部３の管軸芯Ｘ方向一端部に一体形成された連結フランジ部から構成されていて、この連結フランジ部２の周方向複数箇所には、他の流体管や仕切弁等の配管機材１側の連結フランジ部１Ａとボルト８・ナット９を介して固定連結するためのボルト挿通孔２ａが貫通形成されている。
【００２７】
前記抜止め手段７について説明すると、受口管部３のうち、シール保持溝６よりも受口側で、かつ、周方向に等間隔を隔てた複数箇所の各々には、管径方向に貫通する雌ネジ孔７Ａが形成されているとともに、各雌ネジ孔７Ａには、径方向内方への螺合操作に連れて残管４の外周面４ａに喰い込み可能な先鋭状の喰込み部７ａを備えた抜止め部材７Ｂが螺合装着され、更に、各抜止め部材７Ｂの径方向外方側の端部には、アレンレンチ等の人為操作具と径方向から相対回転不能な状態で脱着自在に嵌合する操作凹部７ｂが形成されている。
【００２８】
そして、流体管の切断に伴って発生した直管状の残管４の一側端部を受口管部３に連通接続する残管継手方法を説明すると、図１に示すように、受口管部３のシール保持溝６内に弾性シール材５を嵌合保持するとともに、抜止め手段７の各抜止め部材７Ｂを螺合操作して、各抜止め部材７Ｂの喰込み部７ａを受口管部３の内周面３ａよりも径方向外方に位置させる。
【００２９】
受口管部３の内周面３ａと残管４の挿入管部分４Ａの外周面４ａとの間を密封する円環状の弾性シール材５が損傷しないように、また、残管４の一側端部をスムースに挿入できるように、残管４の一側端部に、先端側ほど小径となるテーパー面４ｂを施工現場で面取り加工したのち、この残管４の一側端部を受口管部３内の所定位置にまで挿入し、抜止め手段７の各抜止め部材７Ｂを締付け側に螺合操作して、残管４の挿入管部分４Ａを受口管部３に抜止め固定する。
【００３０】
それ故に、流体管の切断に伴って発生した厚みの異なる複数種類の直管状の残管４を、離脱阻止機能を有する管継手構造の挿口管として用いる場合でも、残管４をそれの厚みに応じて選別する必要が無く、しかも、残管４の一側端部に対してバリ取りや面取り等の簡易な加工を施すだけで済むので、他の施工現場にそのまま搬入して、離脱阻止機能を有する管継手構造の挿口管として用いることができ、残管４の再利用をコスト面及び期間面で有利に実施することができる。
【００３１】
〔第２実施形態〕
図４は、上述の第１実施形態で説明した残管継手方法の改良を示し、　前記残管４の一側端部に、先端側ほど小径で、かつ、基端側が残管４の外径と同一又はほぼ同一となるテーパー状の挿入ガイド面１０ａを備えた金属製又は合成樹脂製の挿入ガイド部材１０を管軸芯Ｘ方向から圧入状態で嵌合装着したのち、この挿入ガイド部材１０が装着された残管４の一側端部を受口管部３に挿入接続し、この受口管部３の内周面３ａと残管４の挿入管部分４Ａの外周面４ａとの間を、受口管部３に装着される弾性シール材５で密封するとともに、受口管部３に設けた抜止め手段７により、残管４の挿入管部分４Ａを受口管部３に抜止め固定する。
【００３２】
そのため、挿入ガイド部材１０の挿入ガイド面１０ａを利用して、受口管部３への挿入接続操作をスムースに行うことができるから、残管４の一側端部に面取り加工を施す必要がなく、残管４の再利用コストの低廉化及び工期の短縮化を促進することができる。
【００３３】
尚、その他の構成は、第１実施形態で説明した構成と同一であるから、同一の構成箇所には、第１実施形態と同一の番号を付記してそれの説明は省略する。
【００３４】
〔第３実施形態〕
図５〜図８は、水道管やガス管等の流体管の配管系に用いられる残管継手構造及び残管継手方法を示し、流体管Ｐの受口管部３に、例えば、日本工業規格（ＪＩＳ）等で規定された遠心鋳造により製作された鋳鉄製の直管状の流体管を施工現場で切断加工することに伴って発生した残管４の一側端部を、管軸芯Ｘ方向から挿入接続するとともに、挿入接続された残管４に、受口管部３の内周面３ａと残管４の外周面４ａとの間を密封可能な円環状の合成ゴム製の弾性シール材１５と、該弾性シール材１５を管軸芯Ｘ方向から押圧して密封状態（水密状態）にまで圧縮可能な鋳鉄製の押輪１６とが外装されているとともに、押輪１６と受口管部３とを管軸芯Ｘ方向から脱着自在に固定連結する締結手段１７が設けられている。
【００３５】
前記締結手段１７は、受口管部３の端部に一体形成された連結フランジ部３Ａの円周方向複数箇所に形成されたボルト挿通孔３ｂ、及び、押輪１６の外周面の周方向複数箇所（当該実施形態では８箇所）に突出形成された連結突片１６Ａのボルト挿通孔１６ａとのうち、管軸芯Ｘ方向で相対向するボルト挿通孔３ｂ、１６ａに亘って挿入されるＴ字状のボルト１７Ａと、該ボルト１７Ａのネジ軸部に螺合されるナット１７Ｂとから構成されていて、このボルト１７Ａ・ナット１７Ｂの締付け操作に伴う押輪１６と受口管部３との管軸芯Ｘ方向での相対近接移動により、押輪１６の管軸芯Ｘ方向の一端部に形成された円環状のシール押圧部１６Ｂで弾性シール材１５を圧縮変形させ、受口管部３の内周面３ａと残管４の挿入管部分４Ａの外周面４ａとの間を密封する。
【００３６】
前記押輪１６は、残管４の挿入管部分４Ａに対して管軸芯Ｘ方向から外嵌装着自在な円環状に一体成形されていて、その内周面側の周方向に等間隔を隔てた複数箇所（当該実施形態では８箇所）には、管径方向内方に向って開口する凹部１６Ｃが形成され、各凹部１６Ｃ内には、残管４の外周面４ａに喰い込み可能な金属製の抜止め部材１８が装着されているとともに、各抜止め部材１８と押輪１６との間には、受口管部３と残管４との相対離脱移動に連れて抜止め部材１８を管径方向内方側に喰込み移動させる喰込み誘導手段Ａが設けられている。
【００３７】
前記喰込み誘導手段Ａは、抜止め部材１８の外側面の周方向中央部に形成された受口管部１側ほど大径となる傾斜受け面１８Ｃと、この傾斜受け面１８Ｃに対する直交方向（垂直方向）に沿って押輪１６の各凹部１６Ｃに臨む部位に形成されたネジ孔１６ｂ、及び、各ネジ孔１６ｂに対して径方向外方から螺合することにより、傾斜受け面１８Ｃを介して抜止め部材１８を、残管４の外周面４ａ側、つまり、径方向内方側に向って押圧する押圧ネジ部材の一例である押圧ボルト１９とから構成されている。
【００３８】
前記各抜止め部材１８の内側面（内周面）の管軸芯Ｘ方向両端部には、図８に示すように、周方向で連続する三角突条の喰込み突起１８Ａ、１８Ｂが一体形成され、各喰込み突起１８Ａ、１８Ｂの管周方向での長さが同一又は略同一に構成されているとともに、各喰込み突起１８Ａ、１８Ｂの喰込み先端縁が、管軸芯Ｘ方向視において残管４の外周面４ａの半径Ｒ１と同一又は略同一の半径Ｒで弧状に形成されている。
【００３９】
つまり、各喰込み突起１８Ａ、１８Ｂの喰込み先端縁を弧状に形成するための半径Ｒは、残管４の外周面４ａの半径をＲ１としたとき、（Ｒ１＋２ｍｍ未満）〜（Ｒ１−２ｍｍ）の範囲内に、好ましくは、（Ｒ１＋１ｍｍ）〜（Ｒ１−１ｍｍ）の範囲内に、最も好ましくはＲ１と同一径に構成されている。
【００４０】
そして、喰込み突起１８Ａ、１８Ｂの喰込み先端縁が、残管４の外周面４ａの半径Ｒ１よりも＋２ｍｍ未満の僅かに大きな半径Ｒで弧状に形成されている場合には、喰込み突起１８Ａ、１８Ｂの喰込み先端縁の周方向中央部が残管４の外周面４ａに最初に喰込むものの、喰込み先端縁における周方向中央部での喰込み量と周方向両端部での喰込み量との差を小さくすることができ、更に、喰込み突起１８Ａ、１８Ｂの喰込み先端縁が、残管４の外周面４ａの半径Ｒ１よりも＋１ｍｍ以内の僅かに大きな半径Ｒで弧状に形成されている場合には、喰込み先端縁における周方向中央部での喰込み量と周方向両端部での喰込み量との差を更に小さくすることができる。
【００４１】
また、喰込み突起１８Ａ、１８Ｂの喰込み先端縁が、残管４の外周面４ａの半径Ｒ１よりも−２ｍｍ以内の僅かに小さな半径Ｒで弧状に形成されている場合には、喰込み突起１８Ａ、１８Ｂの喰込み先端縁の周方向両端部が残管４の外周面４ａに最初に喰込むため、喰込み先端縁の周方向中央部が残管４の外周面４ａに最初に喰込む場合に比較して、喰込み力を周方向で分散させ易く、しかも、喰込み先端縁における周方向両端部での喰込み量と周方向中央部での喰込み量との差を小さくすることができ、更に、喰込み突起１８Ａ、１８Ｂの喰込み先端縁が、残管４の外周面４ａの半径Ｒ１よりも−１ｍｍ以内の僅かに小さな半径Ｒで弧状に形成されている場合には、喰込み先端縁における周方向両端部での喰込み量と周方向中央部での喰込み量との差を更に小さくすることができる。
【００４２】
更に、喰込み突起１８Ａ、１８Ｂの喰込み先端縁が、残管４の外周面４ａの半径Ｒ１と同一の半径Ｒで弧状に形成されている場合には、喰込み突起１８Ａ、１８Ｂの喰込み先端縁全体が、残管４の外周面４ａに対して均等に喰込むことになり、喰込み先端縁における周方向中央部での喰込み量と周方向両端部での喰込み量とを等しくすることができる。
【００４３】
それ故に、所定の離脱防止機能を確実に発揮させながらも、残管４の内周面に施される防蝕用ライニング層２０に割れや剥離等の損傷が発生することを良好に抑制することができる。
【００４４】
また、図８に示すように、前記押圧ボルト１９の螺合軸芯（ネジ軸芯）Ｚと管軸芯Ｘに対して直交する垂直線Ｙとの成す角度θ５が、１５〜１１度の傾斜角度範囲内に、好ましくは、１４〜１２度の傾斜角度範囲内に、最も好ましくは１３度の傾斜角度に構成されている。
【００４５】
そして、地震や不等沈下等に起因する離脱方向への外力によって、押輪１６に螺合装着された押圧ボルト１９の先端部と抜止め部材１８の傾斜受け面１８Ｃとが管軸芯Ｘ方向で相対移動したとき、この相対移動量に対する抜止め部材１８の径方向内方への喰込み量を適度に小さくすることができるから、押輪１６の管軸芯Ｘ方向での小型化（小幅化）を図りながらも、残管４の防蝕用ライニング層２０に割れや剥離等の損傷が発生することを良好に抑制することができる。
【００４６】
また、流体管Ｐの他端側に形成される挿口管部２１とそれに嵌合接続される配管機材の一例である他の流体管Ｐ１の受口管部２２との間には、両管部２１，２２が管軸芯Ｘ方向に沿って相対離脱移動したとき、管軸芯Ｘ方向から互いに接当してそれ以上の離脱移動を阻止する連結手段２と、挿口管部２１と受口管部２２とを同軸芯状態に維持する屈曲防止手段１１、及び、挿口管部２１の外周面と受口管部２２の内周面との間を密封可能な円環状の合成ゴム製の弾性シール材２６が設けられているとともに、挿口管部２１の外周面で、かつ、周方向に等間隔を隔てた複数箇所（当該実施形態では４箇所）には、受口管部２２の端面と管軸芯Ｘ方向から接当する接合用突起２３が形成されている。
【００４７】
前記連結手段２を構成するに、受口管部２２の内周面に形成された円環状の取付け溝２２ａに、管軸芯Ｘ方向視において略Ｃの字状に形成された拡径側に弾性変形可能なステンレス鋼製の係止部材２４と、これの拡径変形を許容する状態で該係止部材２４を受口管部２２と同軸心状態に保持する弾性保持リング２７とを装着するとともに、挿口管部２１の外周面の先端部には、地震や不等沈下等に起因して両管部２１，２２が一定以上に相対離脱移動したとき、係止部材２４に対して管軸芯Ｘ方向から接当してそれ以上の両管部２１，２２の相対離脱移動を阻止する円環状の抜止め突起２５が一体形成されている。
【００４８】
前記屈曲防止手段１１を構成するに、図５に示すように、挿口管部２１の外周面で、かつ、接合用突起２３に連続する部位及びそれらの周方向中間部位の各々には、接合用突起２３よりも突出代の小なる突起部２８を一体形成するとともに、受口管部２２には、挿口管部２１の複数の突起部２８に接触する拡径側に弾性変形可能なステンレス鋼製の屈曲防止用リング２９と、この屈曲防止用リング２９の周方向複数箇所を径方向内方に押圧して縮径変形させる複数本のセットボルト３０とから構成されている。
【００４９】
また、前記受口管部２２の内周面で、かつ、屈曲防止用リング２９と係止部材２４との間に位置する部位には、弾性シール材２６を保持する環状のシール保持溝２２ｂが形成されている。
【００５０】
尚、その他の構成は、第１実施形態で説明した構成と同一であるから、同一の構成箇所には、第１実施形態と同一の番号を付記してそれの説明は省略する。
【００５１】
〔その他の実施形態〕
（１）上述の第３実施形態で説明した残管４の一側端部に、図４に示す第２実施形態と同様に、　先端側ほど小径で、かつ、基端側が残管４の外径と同一又はほぼ同一となるテーパー状の挿入ガイド面１０ａを備えた金属製又は合成樹脂製の挿入ガイド部材１０を管軸芯Ｘ方向から圧入状態で嵌合装着したのち、この挿入ガイド部材１０が装着された残管４の一側端部を受口管部３に挿入接続するように構成してもよい。
【００５２】
（２）上述の第３実施形態では、前記喰込み誘導手段Ａを、抜止め部材１８の外側面に形成された受口管部３側ほど大径となる傾斜受け面１８Ｃと、この傾斜受け面１８Ｃに対する直交方向に沿って押輪１６の各凹部１６Ｃに臨む部位に形成されたネジ孔１６ｂ、及び、各ネジ孔１６ｂに対して径方向外方から螺合することにより、傾斜受け面１８Ｃを介して抜止め部材１８を残管４の外周面４ａ側に押圧する押圧ボルト１９とから構成したが、抜止め部材１８の傾斜受け面１８Ｃと押圧ボルト１９の先端部との間に、傾斜受け面１８Ｃに摺接する同一勾配の喰込みガイド面を備えた金属製の押え部材を介装して実施してもよい。
要するに、喰込み誘導手段Ａとしては、残管４と受口管部３との相対離脱移動に連れて抜止め部材１８を管径方向内方側に喰込み移動させることのできるものであれば、如何なる構造のものを用いてもよい。
【００５３】
（３）上述の第３実施形態では、前記押輪１６を、残管４の挿入管部分４Ａに対して管軸芯Ｘ方向から外嵌装着自在な円環状に一体成形したが、この押輪１６を円周方向で複数に分割された複数個の分割押輪体から構成してもよい。
【図面の簡単な説明】
【図１】本発明の第１実施形態を示す残管接続前の半断面側面図
【図２】残管接続後の半断面側面図
【図３】図２におけるＩＩ−ＩＩ線断面図
【図４】本発明の第２実施形態を示す残管接続後の半断面側面図
【図５】本発明の第３実施形態を示す残管接続後の断面側面図
【図６】図５におけるＶＩ−ＶＩ線拡大断面図
【図７】押輪の要部の拡大断面正面図
【図８】押輪の要部の拡大断面側面図
【図９】従来の残管継手構造を示す要部の断面側面図
【図１０】固定連結後の抜止め用リングと結合ピースとの正面図
【符号の説明】
Ａ　　　喰込み誘導手段
Ｘ　　　管軸芯
１　　　配管機材
２　　　連結手段（連結フランジ部）
３　　　受口管部
３ａ　　内周面
４　　　残管
４Ａ　　挿入管部分
４ａ　　外周面
７　　　抜止め手段
１０　　挿入ガイド部材
１０ａ　挿入ガイド面
１５　　弾性シール材
１６　　押輪
１７　　締結手段
１８　　抜止め部材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for regenerating residual pipes generated when a straight pipe-shaped fluid pipe having a specified size carried into a pipe work site such as a water supply works is cut based on a pipe size actually measured at the work site.
[0002]
[Prior art]
Considering plumbing work such as water works, most of the work is performed by connecting various piping equipment brought to the site based on the design according to a predetermined procedure, but a part is A method of cutting a straight tubular fluid pipe carried into a site and connecting the cut pipe is adopted based on different pipe dimension differences.
[0003]
Then, in order to configure the cut end portion of the cut pipe to be used cut to the pipe dimension into the insertion pipe portion of the pipe joint structure, for example, as shown in FIGS. The cut end of the cut tube comes into contact with the tapered surface 52 for insertion guide whose diameter becomes smaller toward the distal end, and the lock ring 53 fitted and held on the inner peripheral surface of the receiving tube 3 from the tube axis X direction. After cutting the annular mounting groove 55 for mounting the C-shaped retaining ring 54, the C-shaped retaining ring 54 whose diameter has been expanded is inserted into the mounting groove 55 of the cut tube. A method is adopted in which both ends of the retaining ring 54 and the connecting pieces 56 for retaining are bridged over the retaining ring 54 are fixedly connected to each other by rivets 57 in a state where they are fixed in a predetermined posture with a jig. Have been.
[0004]
Further, the other remaining pipe is not used at the construction site at the cutting processing location, and in order to use it at another construction site, it is necessary to perform the same processing as described above at the carry-in destination.
[0005]
[Problems to be solved by the invention]
As a straight-tube fluid pipe used for a cutting pipe, a cast iron pipe manufactured by centrifugal casting, in which the outer diameter and thickness of the cut point are within an allowable value, even if the pipe is cut at any position in the axial direction of the pipe. High-grade fluid pipes are used, but the dimensions of the remaining pipes vary widely, and the remaining pipes have a first-class pipe having a large thickness suitable for cutting the mounting groove 55 and a thicker first-class pipe. Since there are multiple types of pipes with different thicknesses, such as thin type 3 pipes, it is necessary to select pipe types suitable for the joint structure required at each construction site. At present, the remaining pipe 4 is discarded without reuse because it is very complicated and costly.
Further, when cutting the annular mounting groove 55 for mounting the retaining ring 54 on the remaining pipe, it is necessary to perform the above-mentioned complicated processing at the construction site, and in particular, the retaining ring 54 is required. When the mounting failure of the mounting 54 occurs, the expected detachment prevention effect is greatly reduced. Therefore, the mounting groove 55 needs to be processed with high precision, and the mounting of the retaining ring 54 requires much labor. Therefore, the cost of regenerating the remaining pipe 4 increases, and the processing period becomes longer. In this aspect, it is a factor that hinders the reuse of the remaining pipe 4.
[0006]
The present invention has been made in view of the above situation, and its main problem is to simplify residual pipe management and facilitate processing at a construction site, thereby reducing the residual pipe to another construction site. Another object of the present invention is to provide a useful residual pipe joint method and a residual pipe joint structure which can be easily carried into a pipe joint structure and used easily as an inlet pipe of the pipe joint structure.
[0007]
[Means for Solving the Problems]
The characteristic structure of the remaining pipe joint method according to claim 1 of the present invention is that one end of the cut remaining pipe is inserted and connected to a receiving pipe section provided with a connecting means for piping equipment such as a fluid pipe. A seal between an inner peripheral surface of the receiving tube portion and an outer peripheral surface of the insertion tube portion of the remaining tube is sealed by an elastic sealing material attached to the receiving tube portion, and a retaining means provided on the receiving tube portion. Thus, the insertion tube portion of the remaining tube is retained and fixed to the receiving tube portion.
[0008]
According to the above-mentioned characteristic configuration, even when a plurality of types of straight tubular residual pipes having different thicknesses generated by cutting the fluid pipe are used as the insertion pipe of the pipe joint structure, one end of the residual pipe regardless of the thickness. Is inserted and connected to a receiving pipe section provided with connecting means for piping equipment such as a fluid pipe, and then the insertion pipe portion of the remaining pipe is pulled out to the receiving pipe section by retaining means provided on the receiving pipe section. It is not necessary to sort the remaining pipe according to its thickness, unlike the conventional case, because the stopper pipe is only fixed and fixed, and the elastic sealing material attached to the receiving pipe section is not damaged even when processing the remaining pipe. Thus, it is only necessary to perform simple processing such as deburring or chamfering on one end of the remaining pipe so that one end of the remaining pipe can be smoothly inserted.
[0009]
Therefore, the management of the residual pipe becomes extremely simple, and the processing of the residual pipe requires only simple processing such as deburring and chamfering. And the reuse of the remaining pipe can be advantageously performed in terms of cost and time.
[0010]
A characteristic configuration of the residual pipe joint method according to claim 2 of the present invention is that a taper is provided at one end of the residual pipe such that the diameter is smaller toward the distal end and the outer diameter of the proximal end is the same or substantially the same as the outer diameter of the residual pipe. The present invention is characterized in that after the insertion guide member provided with the insertion guide surface having the shape of the fitting is fitted and mounted from the tube axis direction, the remaining tube is inserted and connected to the receiving tube from the mounting side of the insertion guide member.
[0011]
According to the above-mentioned characteristic configuration, by fitting the insertion guide member to one end of the remaining tube from the axial direction of the tube, the receiving tube portion is utilized by utilizing the insertion guide surface of the insertion guide member. Since the insertion connection operation to the pipe can be smoothly performed, it is not necessary to perform chamfering on one end of the remaining pipe, and it is possible to promote the reduction of the cost of reusing the remaining pipe and the shortening of the construction period. .
[0012]
The characteristic structure of the residual pipe joint method according to claim 3 of the present invention is that an elastic sealing material for sealing between the inner peripheral surface of the receiving pipe part and the outer peripheral surface of the residual pipe is provided on the cut residual pipe. A push ring that presses the sealing material from the axial direction of the pipe and compresses the seal material to a sealed state is provided, one end of the remaining pipe is inserted and connected to the receiving pipe section, and the pressing ring and the receiving pipe section are connected to each other. Tighten and fix from the axial direction, and further, set each of the retaining members attached at multiple locations in the circumferential direction of the pressing ring to a state where it bites into the outer peripheral surface of the remaining tube, and between each retaining member and the pressing ring. The present invention is characterized in that the retaining member is moved inwardly in the radial direction of the pipe by the provided biting guide means as the two pipe parts move away from each other.
[0013]
According to the above-mentioned characteristic configuration, even when using a plurality of types of straight tubular remaining pipes having different thicknesses caused by cutting of the fluid pipe as an inlet pipe of a pipe joint structure, regardless of the thickness, the receiving pipe section is used. An elastic sealing material and a pressing ring are provided on the remaining pipe inserted and connected, and the pressing ring and the receiving pipe section are tightened and fixed in the axial direction of the pipe, so that the inner peripheral surface of the receiving pipe section and the remaining pipe are fixed. While pressing and compressing the elastic sealing material that seals between the outer peripheral surfaces of the push rings to a sealed state, each of the retaining members mounted at a plurality of positions in the circumferential direction of the pressing ring is set in a state of biting into the outer peripheral surface of the remaining tube. By doing so, when an external force in the pulling direction acts on both pipes due to an earthquake, unequal settlement, etc., the bite guiding means provided between each retaining member and the pressing ring causes the relative As the retaining member moves inward in the pipe radial direction with the separation movement, It is possible to enhance the detachment preventing effect of the tube portion.
[0014]
Therefore, there is no need to sort the remaining pipes according to the thickness as in the prior art, and even when processing the remaining pipes, the elastic sealing material provided on the remaining pipes is not damaged. It is only necessary to perform simple processing such as deburring or chamfering on one end of the remaining tube so that the one end of the remaining pipe can be smoothly inserted.
[0015]
Therefore, the management of the residual pipe is extremely simple, and the processing of the residual pipe requires only simple processing such as deburring and chamfering. It can be used as an insertion tube of a joint structure, and the reuse of the remaining tube can be advantageously performed in terms of cost and period.
[0016]
The characteristic structure of the residual pipe joint structure according to claim 4 of the present invention is that one end of the cut residual pipe is inserted and connected to the receiving pipe section, and the inner peripheral surface of the receiving pipe section is connected to the remaining pipe. And an elastic sealing material for sealing between the outer peripheral surface of the remaining pipe and a pressing ring that presses the elastic sealing material from the tube axis direction and compresses the sealing material into a sealed state. Along with the fastening means for tightening and fixing from the pipe axis direction, each of a plurality of locations in the circumferential direction of the pressing ring is provided with a retaining member having a biting projection that can bite into the outer peripheral surface of the remaining pipe. There is provided between the retaining member and the pressing wheel a biting guide means for biting and moving the retaining member inward in the radial direction of the pipe with the relative detachment movement of the two pipe portions.
[0017]
According to the above-mentioned characteristic configuration, even when using a plurality of types of straight tubular remaining pipes having different thicknesses caused by cutting of the fluid pipe as an inlet pipe of a pipe joint structure, regardless of the thickness, the receiving pipe section is used. To the remaining pipe inserted and connected, an elastic sealing material and a pressing ring are externally provided, and the inner peripheral surface of the receiving pipe section is tightened and fastened by the fastening means from the tube axis direction of the pressing ring and the receiving pipe section. A state in which the elastic sealing material for sealing between the outer peripheral surface of the remaining pipe is pressed and compressed to a sealed state, and each of the retaining members mounted at a plurality of locations in the circumferential direction of the pressing ring is bitten into the outer peripheral surface of the remaining pipe. When an external force in the pulling direction acts on both pipes due to an earthquake or the like, the bite guiding means provided between each retaining member and the pressing ring causes the relative displacement of the two pipes. The retaining member moves into the pipe radially inward with Separation preventing effect of the parts can be enhanced.
[0018]
Therefore, there is no need to sort the remaining pipes according to the thickness as in the prior art, and even when processing the remaining pipes, the elastic sealing material provided on the remaining pipes is not damaged. It is only necessary to perform simple processing such as deburring or chamfering on one end of the remaining tube so that the one end of the remaining pipe can be smoothly inserted.
[0019]
Therefore, the management of the residual pipe is extremely simple, and the processing of the residual pipe requires only simple processing such as deburring and chamfering. It can be used as an insertion tube of a joint structure, and the reuse of the remaining tube can be advantageously performed in terms of cost and period.
[0020]
The characteristic configuration of the residual pipe joint structure according to claim 5 of the present invention is that the bite tip edge of the bite projection is the same or substantially the same as the radius of the outer peripheral surface of the insertion pipe portion of the residual pipe when viewed in the pipe axis direction. The point is that it is formed in an arc with a radius.
[0021]
According to the above-mentioned characteristic configuration, when the biting tip edge of the biting projection is formed in an arc with the same radius as the radius of the outer peripheral surface of the insertion tube portion of the remaining tube, the biting tip of the biting projection is formed. The entire rim is evenly cut into the outer peripheral surface of the remaining pipe.
[0022]
Further, when the biting tip edge of the biting projection is formed in an arc shape with a radius slightly larger than the radius of the outer peripheral surface of the insertion tube portion of the remaining pipe, the circumference of the biting tip edge of the biting projection is set. Although the central part in the direction bites into the outer peripheral surface of the insertion pipe part of the remaining pipe first, the difference between the bite amount at the central part in the circumferential direction and the bite amount at both ends in the circumferential direction at the bite tip edge is reduced. be able to.
[0023]
Further, when the biting tip edge of the biting projection is formed in an arc shape with a radius slightly smaller than the radius of the outer peripheral surface of the insertion tube portion of the remaining pipe, the circumference of the biting tip edge of the biting projection is set. Since the both ends of the insertion direction bite into the outer circumferential surface of the insertion tube portion of the remaining tube first, the circumferential center of the biting tip edge bites into the outer circumferential surface of the insertion tube portion first, so that It is easy to disperse the force in the circumferential direction, and it is possible to reduce the difference between the amount of biting at both ends in the circumferential direction at the leading edge of the bite and the amount of biting at the center in the circumferential direction.
[0024]
Therefore, with the economical remodeling that only remodels the shape of the biting tip edge of each biting projection based on the outer diameter of the insertion pipe portion of the remaining pipe, while ensuring the predetermined detachment prevention function, Damage such as cracking or peeling of the corrosion-resistant lining layer provided on the inner peripheral surface of the pipe can be favorably suppressed.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
FIGS. 1 to 3 show a remaining pipe joint structure used for a piping system of a fluid pipe such as a water pipe or a gas pipe, and a cast iron receiver provided with a connecting means 2 for a piping device 1 such as a fluid pipe and a gate valve. In the mouth tube section 3, for example, a cast iron straight tubular fluid pipe manufactured by centrifugal casting specified by Japanese Industrial Standards (JIS) or the like is cut off at a construction site by a cutting pipe. One side end is inserted and connected from the tube axis X direction, and the inner peripheral surface 3a of the receiving tube portion 3 is sealed with the outer peripheral surface 4a of the insertion tube portion 4A of the remaining tube 4. An annular seal holding groove 6 for fitting and holding an elastic sealing material 5 made of synthetic resin is formed. Further, the insertion tube portion 4A of the remaining tube 4 is prevented from being removed from the reception tube portion 3 in the reception tube portion 3. A retaining means 7 for fixing is provided.
[0026]
The connecting means 2 is composed of a connecting flange part integrally formed at one end in the pipe axis X direction of the receiving pipe part 3, and other fluid pipes are provided at a plurality of locations in the circumferential direction of the connecting flange part 2. A bolt insertion hole 2a for fixed connection with a connection flange 1A on the side of the piping equipment 1 such as a valve and a gate valve via bolts 8 and nuts 9 is formed therethrough.
[0027]
The retaining means 7 will be described. In the receiving pipe section 3, a plurality of locations at the receiving side of the seal holding groove 6 and at equal intervals in the circumferential direction penetrate in the pipe diameter direction. A female screw hole 7A is formed, and each female screw hole 7A has a sharp biting portion that can bite into the outer peripheral surface 4a of the remaining tube 4 with a screwing operation inward in the radial direction. A retaining member 7B provided with a retaining member 7a is screwed into the retaining member 7B. Further, a radially outward end of each retaining member 7B is in a state in which it cannot be rotated relative to a manual operation tool such as an Allen wrench from a radial direction. An operation concave portion 7b which is detachably fitted is formed.
[0028]
Then, a method for connecting the one end of the straight tubular residual pipe 4 generated along with the cutting of the fluid pipe to the receiving pipe section 3 will be described. As shown in FIG. The elastic sealing material 5 is fitted and held in the seal holding groove 6 of the portion 3 and each retaining member 7B of the retaining means 7 is screwed to receive the biting portion 7a of each retaining member 7B. It is located radially outward from the inner peripheral surface 3a of the tube portion 3.
[0029]
The annular elastic sealing member 5 for sealing between the inner peripheral surface 3a of the receiving tube portion 3 and the outer peripheral surface 4a of the insertion tube portion 4A of the remaining tube 4 is not damaged, and one side of the remaining tube 4 is not damaged. At one end of the remaining pipe 4, a tapered surface 4 b having a smaller diameter toward the distal end is chamfered at a construction site so that the end can be smoothly inserted. It is inserted to a predetermined position in the pipe part 3, and each of the retaining members 7B of the retaining means 7 is screwed into the tightening side, so that the inserted pipe part 4A of the remaining pipe 4 is retained and fixed to the receiving pipe part 3. I do.
[0030]
Therefore, even when a plurality of types of straight tubular remaining pipes 4 having different thicknesses caused by cutting the fluid pipes are used as an inlet pipe of a pipe joint structure having a detachment preventing function, the remaining pipes 4 are formed to have the same thickness. There is no need to sort according to the conditions, and only simple processing such as deburring or chamfering is performed on one end of the remaining pipe 4, so that it can be transported to another construction site as it is to prevent departure. It can be used as an insertion tube of a pipe joint structure having a function, and the reuse of the remaining tube 4 can be advantageously performed in terms of cost and period.
[0031]
[Second embodiment]
FIG. 4 shows an improvement of the residual pipe joint method described in the first embodiment. The one end of the residual pipe 4 has a smaller diameter toward the distal end, and the outer diameter of the residual pipe 4 at the proximal end. After a metal or synthetic resin insertion guide member 10 having a tapered insertion guide surface 10a that is the same as or substantially the same as the above, the insertion guide member 10 is fitted and mounted in a press-fit state from the pipe axis X direction. One end of the attached remaining tube 4 is inserted and connected to the receiving tube portion 3, and a gap between the inner peripheral surface 3 a of the receiving tube portion 3 and the outer peripheral surface 4 a of the insertion tube portion 4 A of the remaining tube 4 is formed. In addition to sealing with the elastic sealing material 5 attached to the receiving tube portion 3, the insertion tube portion 4A of the remaining tube 4 is prevented from being removed from the receiving tube portion 3 by the retaining means 7 provided on the receiving tube portion 3. Fix it.
[0032]
Therefore, the operation of inserting and connecting to the receiving tube portion 3 can be smoothly performed using the insertion guide surface 10a of the insertion guide member 10, and therefore, it is necessary to perform chamfering on one side end of the remaining tube 4. In addition, the cost of reusing the remaining pipe 4 can be reduced and the construction period can be shortened.
[0033]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0034]
[Third embodiment]
FIGS. 5 to 8 show a residual pipe joint structure and a residual pipe joint method used for a piping system of a fluid pipe such as a water pipe or a gas pipe. One side end of the remaining pipe 4 generated by cutting a straight pipe fluid pipe made of cast iron manufactured by centrifugal casting specified in (JIS) or the like at the construction site is taken along the pipe axis X direction. And an annular synthetic rubber elastic seal material capable of sealing between the inner peripheral surface 3a of the receiving tube portion 3 and the outer peripheral surface 4a of the remaining tube 4 to the inserted and connected remaining tube 4. 15 and a cast iron press ring 16 which presses the elastic sealing material 15 in the pipe axis X direction and compresses it to a sealed state (watertight state). And a fastening means 17 for detachably fixing the connection from the tube axis X direction.
[0035]
The fastening means 17 includes a plurality of bolt insertion holes 3b formed at a plurality of positions in a circumferential direction of a connection flange portion 3A integrally formed at an end portion of the receiving tube portion 3, and a plurality of positions in a circumferential direction of an outer peripheral surface of the pressing ring 16. A T-shape that is inserted across the bolt insertion holes 3b and 16a that are opposed to each other in the tube axis X direction among the bolt insertion holes 16a of the connection protrusion 16A protrudingly formed (eight places in the present embodiment). And a nut 17B screwed to a screw shaft portion of the bolt 17A, and a tube shaft center of the press ring 16 and the receiving tube portion 3 accompanying the tightening operation of the bolt 17A and the nut 17B. Due to the relative approach movement in the X direction, the elastic sealing material 15 is compressed and deformed by an annular seal pressing portion 16B formed at one end of the pressing ring 16 in the tube axis X direction, and the inner peripheral surface of the receiving tube portion 3 is compressed. 3a and outer peripheral surface of insertion tube portion 4A of remaining tube 4 To seal between the a.
[0036]
The pressing ring 16 is formed integrally with the insertion tube portion 4A of the remaining tube 4 in an annular shape that can be fitted to the outside from the tube axis X direction, and is equally spaced in the circumferential direction on the inner peripheral surface side. At a plurality of locations (eight locations in the present embodiment), recesses 16C that open inward in the pipe radial direction are formed, and each recess 16C is made of a metal that can bite into the outer peripheral surface 4a of the remaining pipe 4. The retaining member 18 is attached between the retaining member 18 and the pressing ring 16 and the retaining member 18 is moved between the receiving tube portion 3 and the remaining tube 4 by a relative diameter. A biting guide means A for biting and moving inward in the direction is provided.
[0037]
The biting guide means A includes a slope receiving surface 18C formed at the center in the circumferential direction of the outer surface of the retaining member 18 and having a larger diameter toward the receiving pipe 1 side, and a direction orthogonal to the slope receiving surface 18C ( (Perpendicular direction), and screw holes 16b formed at portions facing the concave portions 16C of the press wheel 16 and screwed into the screw holes 16b from outside in the radial direction, thereby via the inclined receiving surface 18C. The retaining member 18 includes a pressing bolt 19 that is an example of a pressing screw member that presses the retaining member 18 toward the outer peripheral surface 4a of the remaining tube 4, that is, toward the radially inward side.
[0038]
As shown in FIG. 8, circumferentially continuous triangular ridges 18A and 18B are integrally formed at both ends of the inner surface (inner peripheral surface) of each retaining member 18 in the pipe axis X direction. The lengths of the biting projections 18A and 18B in the circumferential direction of the pipe are the same or substantially the same, and the biting tip edges of the biting projections 18A and 18B are positioned in the pipe axis X direction. The remaining pipe 4 is formed in an arc shape with a radius R that is the same as or substantially the same as the radius R1 of the outer peripheral surface 4a.
[0039]
That is, when the radius of the outer peripheral surface 4a of the remaining tube 4 is R1, the radius R for forming the biting tip edges of the biting projections 18A and 18B in an arc shape is (R1 + 2 mm) to (R1-2 mm). , Preferably in the range of (R1 + 1 mm) to (R1-1 mm), and most preferably the same diameter as R1.
[0040]
When the biting tip edges of the biting projections 18A and 18B are formed in an arc shape with a slightly larger radius R less than +2 mm than the radius R1 of the outer peripheral surface 4a of the remaining pipe 4, the biting projection 18A is formed. , 18B bites into the outer peripheral surface 4a of the remaining pipe 4 first, but the bite amount at the circumferential center at the bite tip edge and bite at both circumferential ends In addition, the difference between the diameter and the depth can be reduced, and the biting tip edges of the biting projections 18A and 18B are formed in an arc shape with a slightly larger radius R within +1 mm than the radius R1 of the outer peripheral surface 4a of the remaining tube 4. In this case, it is possible to further reduce the difference between the amount of biting at the center in the circumferential direction at the leading edge of the bite and the amount of biting at both ends in the circumferential direction.
[0041]
If the biting tip edges of the biting projections 18A and 18B are formed in an arc shape with a slightly smaller radius R within -2 mm than the radius R1 of the outer peripheral surface 4a of the remaining pipe 4, Since the circumferential end portions of the biting tip edges of 18A and 18B bite into the outer peripheral surface 4a of the remaining tube 4 first, the circumferential center portion of the biting tip edge bites into the outer peripheral surface 4a of the remaining tube 4 first. In comparison with the case, it is easier to disperse the biting force in the circumferential direction, and to reduce the difference between the biting amount at both ends in the circumferential direction at the leading edge of the bite and the biting amount at the center in the circumferential direction. Further, when the biting tip edges of the biting projections 18A and 18B are formed in an arc shape with a slightly smaller radius R within -1 mm than the radius R1 of the outer peripheral surface 4a of the remaining tube 4, Biting amount at both ends in the circumferential direction at the leading edge and biting at the center in the circumferential direction It can further reduce the difference between the amount.
[0042]
Further, if the biting tip edges of the biting projections 18A, 18B are formed in an arc with the same radius R as the radius R1 of the outer peripheral surface 4a of the remaining pipe 4, the biting projections 18A, 18B are bitten. The entire distal end edge is evenly bitten into the outer peripheral surface 4a of the remaining pipe 4, and the bite amount at the central portion in the circumferential direction at the bite tip edge is equal to the bite amount at both ends in the circumferential direction. can do.
[0043]
Therefore, it is possible to satisfactorily suppress the occurrence of damage such as cracking and peeling in the corrosion-resistant lining layer 20 applied to the inner peripheral surface of the remaining pipe 4 while reliably exhibiting the predetermined separation prevention function. it can.
[0044]
As shown in FIG. 8, the angle θ5 between the screw axis (screw axis) Z of the pressing bolt 19 and a vertical line Y orthogonal to the pipe axis X is an inclination of 15 to 11 degrees. It is configured in an angle range, preferably in a tilt angle range of 14 to 12 degrees, and most preferably in a tilt angle of 13 degrees.
[0045]
Then, due to an external force in the detaching direction caused by an earthquake, uneven settlement, or the like, the tip end of the pressing bolt 19 screwed to the pressing wheel 16 and the inclined receiving surface 18C of the retaining member 18 are aligned in the pipe axis X direction. When the relative movement is made, the amount of the retaining member 18 that intrudes inward in the radial direction with respect to the relative movement amount can be appropriately reduced, so that the pressing wheel 16 can be reduced in size in the X axis direction (reduction in width). However, the occurrence of damage such as cracking or peeling in the corrosion-resistant lining layer 20 of the remaining pipe 4 can be satisfactorily suppressed.
[0046]
In addition, both pipes are provided between the insertion pipe section 21 formed on the other end side of the fluid pipe P and the reception pipe section 22 of another fluid pipe P1 which is an example of piping equipment fitted and connected thereto. When the portions 21 and 22 relatively move away from each other along the pipe axis X direction, the connecting means 2 contacts each other from the tube axis X direction to prevent further moving away, and the receiving pipe section 21 and the receiving means. Bending prevention means 11 for maintaining the mouth tube portion 22 in a coaxial core state, and an annular synthetic rubber capable of sealing between the outer peripheral surface of the insertion tube portion 21 and the inner peripheral surface of the receiving tube portion 22 Are provided on the outer peripheral surface of the insertion tube portion 21 and at a plurality of positions (four positions in this embodiment) at equal intervals in the circumferential direction. Are formed on the end surface of the tube and the joining protrusion 23 which comes into contact with the tube axis X in the X-axis direction.
[0047]
The connecting means 2 is configured such that an annular mounting groove 22a formed on the inner peripheral surface of the receiving pipe portion 22 is provided with a substantially C-shaped enlarged side when viewed in the pipe axis X direction. An elastically deformable locking member 24 made of stainless steel and an elastic holding ring 27 for holding the locking member 24 coaxially with the receiving tube portion 22 in a state of allowing the radial expansion deformation of the locking member 24 are mounted. At the same time, when the two pipe parts 21 and 22 are relatively displaced by a certain amount or more due to an earthquake, unequal settlement, etc., the tip of the outer peripheral surface of the insertion pipe part 21 is connected to the locking member 24 by a pipe. An annular retaining projection 25 is formed integrally with the tubular portion 21 and 22 that comes into contact with the axial center X direction and prevents further relative movement of the two pipe portions 21 and 22.
[0048]
As shown in FIG. 5, the bending prevention means 11 is formed by joining a portion of the outer peripheral surface of the insertion tube portion 21 which is continuous with the joining projection 23 and each of the circumferentially intermediate portions thereof. A projection 28 having a smaller protrusion margin than the projection 23 is integrally formed, and the receiving pipe 22 is made of stainless steel which is elastically deformable to an enlarged diameter side in contact with the plurality of projections 28 of the insertion pipe 21. It is composed of a steel bending prevention ring 29 and a plurality of set bolts 30 for radially inwardly pressing a plurality of circumferential portions of the bending prevention ring 29 to reduce the diameter.
[0049]
An annular seal holding groove 22b for holding the elastic seal material 26 is provided on the inner peripheral surface of the receiving tube portion 22 and at a position between the bending prevention ring 29 and the locking member 24. Is formed.
[0050]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0051]
[Other embodiments]
(1) As in the second embodiment shown in FIG. 4, the diameter of the remaining tube 4 is smaller at the one end of the remaining tube 4 described in the above-described third embodiment, and the base end is outside the remaining tube 4. A metal or synthetic resin insertion guide member 10 having a tapered insertion guide surface 10a having the same or almost the same diameter as the insertion guide member 10 is fitted and mounted in a press-fit state from the pipe axis X direction. May be configured to insert and connect one end of the remaining pipe 4 with the attached to the receiving pipe section 3.
[0052]
(2) In the above-described third embodiment, the biting guide means A is provided with an inclined receiving surface 18C formed on the outer surface of the retaining member 18 and having a larger diameter toward the receiving pipe portion 3; A screw hole 16b formed in a portion facing each concave portion 16C of the pressing wheel 16 along a direction orthogonal to the surface 18C, and a screw receiving surface 18C is screwed into each screw hole 16b from the outside in the radial direction. The retaining bolt 18 presses the retaining member 18 against the outer peripheral surface 4a side of the remaining pipe 4 through the interposition of the retaining bolt 18 between the inclined receiving surface 18C of the retaining member 18 and the tip end of the pressing bolt 19. The present invention may be implemented by interposing a metal pressing member provided with a biting guide surface of the same gradient that slides on the surface 18C.
In short, as the biting guide means A, any means capable of biting and moving the retaining member 18 inward in the pipe diameter direction with the relative detachment movement between the remaining pipe 4 and the receiving pipe part 3 can be used. Any structure may be used.
[0053]
(3) In the above-described third embodiment, the pressing ring 16 is formed integrally with the insertion tube portion 4A of the remaining tube 4 in an annular shape that can be externally fitted from the tube axis X direction. It may be constituted by a plurality of divided pressing ring bodies divided into a plurality in the circumferential direction.
[Brief description of the drawings]
FIG. 1 is a half cross-sectional side view showing a first embodiment of the present invention before connection of a residual pipe.
FIG. 2 is a side view of a half section after connection of a residual pipe.
FIG. 3 is a sectional view taken along line II-II in FIG. 2;
FIG. 4 is a half cross-sectional side view showing a second embodiment of the present invention after connection of a residual pipe.
FIG. 5 is a cross-sectional side view showing a third embodiment of the present invention after connection of a residual pipe.
6 is an enlarged sectional view taken along line VI-VI in FIG. 5;
FIG. 7 is an enlarged sectional front view of a main part of the pressing wheel.
FIG. 8 is an enlarged sectional side view of a main part of the pressing wheel.
FIG. 9 is a sectional side view of a main part showing a conventional residual pipe joint structure.
FIG. 10 is a front view of the retaining ring and the connecting piece after fixed connection.
[Explanation of symbols]
A biting guidance means
X pipe core
1 Piping equipment
2 Connection means (connection flange)
3 Receiving pipe section
3a Inner circumference
4 Remaining pipe
4A insertion tube part
4a Outer peripheral surface
7 Means of retaining
10 Insertion guide member
10a Insertion guide surface
15 Elastic sealing material
16 Pressing wheel
17 fastening means
18 Retaining member

Claims

切断された残管の一側端部を、流体管等の配管機材に対する連結手段を備えた受口管部に挿入接続し、この受口管部の内周面と残管の挿入管部分の外周面との間を、受口管部に装着される弾性シール材で密封するとともに、前記受口管部に設けた抜止め手段により、残管の挿入管部分を受口管部に抜止め固定することを特徴とする残管継手方法。One end of the cut remaining pipe is inserted and connected to a receiving pipe section provided with a connecting means for piping equipment such as a fluid pipe, and an inner peripheral surface of the receiving pipe section and an insertion pipe section of the remaining pipe are connected. The space between the outer pipe and the outer peripheral surface is sealed with an elastic sealing material attached to the receiving pipe section, and the insertion pipe portion of the remaining pipe is prevented from being removed from the receiving pipe section by the retaining means provided on the receiving pipe section. A residual pipe joint method characterized by being fixed.

前記残管の一側端部に、先端側ほど小径で、かつ、基端側が残管の外径と同一又はほぼ同一となるテーパー状の挿入ガイド面を備えた挿入ガイド部材を管軸芯方向から嵌合装着したのち、この挿入ガイド部材の装着側から残管を受口管部に挿入接続することを特徴とする請求項１記載の残管継手方法。At one end of the remaining pipe, the insertion guide member having a tapered insertion guide surface whose diameter is smaller toward the distal end and whose base end is the same or almost the same as the outer diameter of the remaining pipe is arranged in the axial direction of the pipe. 2. The method according to claim 1, further comprising: inserting the remaining guide from the mounting side of the insertion guide member into the receiving pipe portion after fitting.

切断された残管に、受口管部の内周面と残管の外周面との間を密封する弾性シール材と、該弾性シール材を管軸芯方向から押圧して密封状態にまで圧縮する押輪とを外装し、残管の一側端部を受口管部に挿入接続するとともに、押輪と受口管部とを管軸芯方向から締付け固定し、更に、押輪の周方向複数箇所に装着された抜止め部材の各々を、残管の外周面に喰込む状態に設定し、各抜止め部材と押輪との間に設けた喰込み誘導手段により、両管部の相対離脱移動に連れて抜止め部材を管径方向内方側に喰込み移動させることを特徴とする残管継手方法。An elastic sealing material that seals between the inner peripheral surface of the receiving tube portion and the outer peripheral surface of the remaining tube on the cut remaining tube, and the elastic sealing material is pressed from the tube axis direction and compressed to a sealed state. And connecting the one end of the remaining pipe to the receiving pipe section, tightening and fixing the pressing ring and the receiving pipe section from the pipe axis direction, and further, at a plurality of locations in the circumferential direction of the pressing ring. Each of the retaining members attached to the tube is set to bite into the outer peripheral surface of the remaining tube, and the bite guiding means provided between each retaining member and the pressing ring allows the relative disengagement movement of both tube parts. A remaining pipe joint method characterized by moving the retaining member into the pipe radially inward.

受口管部に、切断された残管の一側端部を挿入接続し、この残管に、受口管部の内周面と残管の外周面との間を密封する弾性シール材と、該弾性シール材を管軸芯方向から押圧して密封状態にまで圧縮する押輪とを外装し、押輪と受口管部とを管軸芯方向から締付け固定する締結手段を設けるとともに、押輪の周方向複数箇所の各々には、残管の外周面に喰込み可能な喰込み突起を備えた抜止め部材を装着するとともに、各抜止め部材と押輪との間には、両管部の相対離脱移動に連れて抜止め部材を管径方向内方側に喰込み移動させる喰込み誘導手段を設けてある残管継手構造。One end of the cut remaining pipe is inserted and connected to the receiving pipe, and an elastic sealing material for sealing between the inner peripheral surface of the receiving pipe and the outer peripheral surface of the remaining pipe is connected to the remaining pipe. A push ring that presses the elastic seal material from the tube axis direction to compress it into a sealed state, and provides fastening means for tightening and fixing the push ring and the receiving tube portion from the tube axis direction; At each of the plurality of locations in the circumferential direction, a retaining member having a biting projection that can bite into the outer peripheral surface of the remaining pipe is attached. A residual pipe joint structure provided with biting guide means for biting and moving the retaining member inward in the pipe diameter direction with the separation movement.

前記喰込み突起の喰込み先端縁が、管軸芯方向視において残管の挿入管部分の外周面の半径と同一又は略同一の半径で弧状に形成されている請求項４記載の残管継手構造。5. The residual pipe joint according to claim 4, wherein the bite tip edge of the bite projection is formed in an arc shape with the same or substantially the same radius as the radius of the outer peripheral surface of the insertion pipe portion of the residual pipe when viewed in the axial direction of the pipe. Construction.