JP4198453B2 - End structure of water pipe, water pipe having the same end structure, connection structure between water pipe and connecting body, and method of forming end structure of water pipe - Google Patents

End structure of water pipe, water pipe having the same end structure, connection structure between water pipe and connecting body, and method of forming end structure of water pipe Download PDF

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JP4198453B2
JP4198453B2 JP2002362316A JP2002362316A JP4198453B2 JP 4198453 B2 JP4198453 B2 JP 4198453B2 JP 2002362316 A JP2002362316 A JP 2002362316A JP 2002362316 A JP2002362316 A JP 2002362316A JP 4198453 B2 JP4198453 B2 JP 4198453B2
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pipe
connection
water pipe
peripheral surface
diameter
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JP2004225712A (en
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昭八 清水
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Mirai Kogyo KK
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Mirai Kogyo KK
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Priority to EP02793380A priority patent/EP1460324A4/en
Priority to PCT/JP2002/013509 priority patent/WO2003056227A1/en
Priority to CN028260414A priority patent/CN100406797C/en
Priority to KR10-2004-7010049A priority patent/KR20040071251A/en
Priority to AU2002360021A priority patent/AU2002360021A1/en
Priority to US10/499,836 priority patent/US7350831B2/en
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Description

【０００１】
【発明の属する技術分野】
本発明は、例えば継手に接続された通水管の管本体の端部における流体の漏れ出しを防止し、管本体と継手との間からの流体の漏れ出しを防止するために形成される通水管の端部構造、同端部構造を備えた通水管並びに同通水管と接続体との接続構造及び通水管の端部構造の形成方法に関するものである。
【０００２】
【従来の技術】
従来より、例えば継手等の接続体と、給水管として使用される合成樹脂材料製の通水管とは、両者の接続部分からの流体の漏れ出しが防止されるように接続されている（例えば、特許文献１参照。）。図２５に示すように、通水管１０１は管本体１０１ａよりなり、その管本体１０１ａが接続される前記継手１０２は、金属材料により略円筒状に形成されている。継手１０２の一端部には前記通水管１０１の内側に挿入されるインナー体としての接続筒部１０３が突設され、他端部には管体（図示せず）が接続可能に形成されている。前記接続筒部１０３の外周面には同接続筒部１０３の周方向に沿って外方へ突出する突条１０３ａが一定間隔をおいて複数箇所に形成されている。
【０００３】
上記継手１０２に通水管１０１を接続するには、まず、通水管１０１と継手１０２の接続状態で、管本体１０１ａの内径と、接続筒部１０３の内径とをほぼ同じにし、接続筒部１０３による流体の流量損失を小さくするため、管本体１０１ａの端部を拡径治具（図示せず）を使用して拡径する。そして、管本体１０１ａの拡径された端部が自己の収縮力により元の状態に復帰する前に管本体１０１ａの拡径部分を接続筒部１０３の外周面に装着する。すると、管本体１０１ａが前記収縮により縮径して管本体１０１ａの内周面が接続筒部１０３の外周面に圧接する。さらに、拡径された管本体１０１ａの端部に合成樹脂材料によりリング状に形成された固定リング１０４を外嵌する。
【０００４】
すると、前記固定リング１０４の収縮に伴う縮径により管本体１０１ａの端部が外周側から締め付けられ、管本体１０１ａの端部が固定リング１０４と接続筒部１０３との間に挟持される。その結果、管本体１０１ａの内周面に突条１０３ａが食い込み、管本体１０１ａが接続筒部１０３に抜け止めされ、通水管１０１が継手１０２に抜け止めされた状態に接続される。
【０００５】
前記通水管１０１と継手１０２との接続状態において、管本体１０１ａの縮径による締付及び固定リング１０４の管本体１０１ａの端部に対する締付により、管本体１０１ａの内周面が接続筒部１０３の外周面に圧接し、流体に対するシール構造が形成されている。そして、そのシール構造により管本体１０１ａの端部における流体の漏れ出しが防止され、通水管１０１と継手１０２との間から流体が漏れ出るのが防止されている。
【０００６】
【特許文献１】
特開２０００−２３８４号公報
【０００７】
【発明が解決しようとする課題】
ところが、上記従来の通水管１０１と継手１０２との接続構造において、管本体１０１ａの端部を接続筒部１０３の外周に装着するには、前記端部の内径が接続筒部１０３の外径より大きくなるように拡径しなければならない。即ち、管本体１０１ａの端部の内周面が接続筒部１０３の外周面に圧接する状態よりも、端部の内径が大きくなるように拡径しなければならなず、管本体１０１ａの端部には必要以上に大きな負荷が作用してしまう。従って、前記負荷により管本体１０１ａの端部が損傷を受けたり、変形したりして、通水管１０１と継手１０２との接続状態において、管本体１０１ａの端部から流体が漏れ出てしまうおそれがあるという問題があった。
【０００８】
また、固定リング１０４を拡径された管本体１０１ａの端部に外嵌するには、工具を使用して固定リング１０４を管本体１０１ａの拡径された端部側へ強制的にスライド移動させなければならない。そのため、管本体１０１ａを拡径する作業とは別に固定リング１０４をスライド移動させなければならず、管本体１０１ａの端部にシール構造を形成する作業が非常に煩雑であるという問題があった。
【０００９】
本発明は、上記従来技術に存在する問題点に着目してなされたものである。その目的とするところは、管本体の拡径作業時に端部に作用する負荷を最小限に抑えて管本体の端部の変形等を防止することができ、管本体と接続体との接続状態において、管本体の端部における流体の漏れ出しを防止することができる通水管の端部構造及び同端部構造を備えた通水管を提供することにある。その他の目的とするところは、管本体の拡径作業時に端部に作用する負荷を最小限に抑えて管本体の端部の変形等を防止することができ、管本体と接続体との接続状態において、管本体の端部における流体の漏れ出しを防止することができる通水管と接続体との接続構造を提供することにある。また、その他の目的とするところは、管本体の拡径作業時に端部に作用する負荷を最小限に抑えて管本体の端部の変形等を防止することができ、管本体と接続体との接続状態において、管本体の端部における流体の漏れ出しを防止することができる端部構造の形成方法を提供することにある。加えて、管本体の端部における流体の漏れ出しを防止するシール構造を容易に形成することができる通水管の接続端部の形成方法を提供することにある。
【００１０】
【課題を解決するための手段】
上記問題点を解決するために、請求項１に記載の発明は、接続体に接続された合成樹脂材料製の管本体の端部における流体の漏れ出しを防止する通水管の端部構造であって、前記管本体の端部の内側には環状をなす金属材料製のインナー体が挿入され、前記管本体の端部の外側にはアウター体が装着され、同インナー体が内側から拡径されて当該インナー体の外周面と管本体の内周面との間及びアウター体の内周面と管本体の外周面との間に管本体内を流通する流体の漏れ出しを防止するシール構造が形成されていることを要旨とする。
【００１２】
請求項２に記載の発明は、請求項１に記載の通水管の端部構造において、前記インナー体とアウター体とは一体形成されていることを要旨とする。
請求項３に記載の発明は、請求項１又は請求項２に記載の通水管の端部構造において、前記アウター体はインナー体の拡径とともに拡径されることを要旨とする。
【００１３】
請求項４に記載の発明は、請求項１に記載の通水管の端部構造において、前記アウター体は合成樹脂材料により形成され、拡径されたアウター体の拡径状態からの収縮によりアウター体が管本体の外周面に圧接していることを要旨とする。
【００１４】
請求項５に記載の発明は、請求項１〜請求項４のいずれか一項に記載の通水管の端部構造において、前記インナー体の拡径により管本体の端部には、当該管本体を接続体に接続させるための接続用膨出部が形成されていることを要旨とする。
【００１５】
請求項６に記載の発明は、接続体に接続された合成樹脂材料製の管本体の端部における流体の漏れ出しを防止する通水管の端部構造であって、前記管本体の端部の内側には環状をなす金属材料製のインナー体が挿入され、同インナー体が内側から拡径されて当該インナー体の外周面と管本体の内周面との間に管本体内を流通する流体の漏れ出しを防止するシール構造が形成され、前記インナー体は管本体内への挿入状態において、管本体の端面から延出する延出部を備え、当該延出部は管本体を接続体に接続するための固定部であることを要旨とする。
【００１６】
請求項７に記載の発明は、請求項１〜請求項６のいずれか一項に記載の端部構造を管本体の一端部又は両端部に備えたことを要旨とする。
請求項８に記載の発明は、請求項５に記載の端部構造を備えた通水管を、接続体に接続するために管本体の端部と接続体の接続筒部との間に形成される通水管と接続体との接続構造であって、前記管本体の接続用膨出部と、前記接続筒部に設けられた接続手段の係合部との係合により形成されていることを要旨とする。
【００１７】
請求項９に記載の発明は、請求項８に記載の端部構造を備えた通水管と接続体との接続構造において、前記接続手段は接続筒部に螺合して取り付けられ、その取付状態で接続用膨出部に係合する係合部を備えた抜脱防止スリーブにより形成されていることを要旨とする。
【００１８】
請求項１０に記載の発明は、請求項８に記載の端部構造を備えた通水管と接続体との接続構造において、前記接続手段は係合部を備えた係合体と、当該係合体と接続用膨出部との係合を維持すべく接続筒部に取り付けられる取着体とにより形成されていることを要旨とする。
【００１９】
請求項１１に記載の発明は、請求項１０に記載の端部構造を備えた通水管と接続体との接続構造において、前記取着体は前記係合体を内部に保持して接続筒部に螺合して取り付けられる固定スリーブにより形成されていることを要旨とする。
【００２０】
請求項１２に記載の発明は、請求項１１に記載の端部構造を備えた通水管と接続体との接続構造において、前記固定スリーブは管本体の接続用膨出部が形成された端部側から同接続用膨出部の外側を通過して管本体に装着されることを要旨とする。
【００２１】
請求項１３に記載の発明は、請求項１０に記載の端部構造を備えた通水管と接続体との接続構造において、前記取着体は接続筒部内に挿入された係合体の同接続筒部内からの抜脱を防止すべく接続筒部に取着されるピン体により形成されていることを要旨とする。
【００２２】
請求項１４に記載の発明は、請求項１０〜請求項１３のいずれか一項に記載の端部構造を備えた通水管と接続体との接続構造において、前記係合体は複数の分割体を組付けることにより形成され、前記接続用膨出部の形成後に、当該接続用膨出部に係合して取り付けられるように形成されていることを要旨とする。
【００２３】
請求項１５に記載の発明は、接続体に接続された合成樹脂材料製の管本体の端部における流体の漏れ出しを防止するため管本体の端部にシール構造を形成する通水管の端部構造の形成方法であって、前記管本体の端部の内側に環状をなす金属材料製のインナー体を挿入し、前記管本体の端部の外側にアウター体を装着し、同インナー体を内側から拡径して当該インナー体の外周面と管本体の内周面及びアウター体の内周面と管本体の外周面とを圧接させて管本体内を流通する流体の漏れ出しを防止するシール構造を形成することを要旨とする。
【００２４】
【発明の実施の形態】
（第１の実施形態）
以下、本発明を具体化した通水管の端部構造、同端部構造を備えた通水管並びに同通水管と接続体との接続構造及び通水管の端部構造の形成方法の一実施形態を図１〜図６に従って説明する。なお、第１の実施形態の以下の説明における上下左右は、図１及び図２における上下左右に対応する。
【００２５】
図１に示すように、通水管１１の端部構造１０は、合成樹脂材料製の管本体１１ａの右端部の内側に金属材料製のインナー体としての筒体１３が挿入されて形成されている。即ち、管本体１１ａ内の前記筒体１３が内側から拡径されて当該筒体１３の外周面と管本体１１ａの内周面との間に、管本体１１ａ内を流通する流体の漏れ出しを防止するシール構造が形成されて構成されている。
【００２６】
そして、図２に示すように、前記シール構造により、接続体としての継手１２に接続された管本体１１ａの端部における流体の漏れ出しが防止され、管本体１１ａと継手１２との間からの流体の漏れ出しが防止されるように構成されている。図３に示すように、前記筒体１３は金属材料により円筒状に形成され、拡径前の筒体１３の外径は、拡径前の管本体１１ａの内径よりわずかに小さく形成されている。
【００２７】
図２に示すように、前記継手１２は合成樹脂材料又は金属材料製の継手本体１４及び抜脱防止スリーブ２０により形成されている。なお、この第１の実施形態では、前記継手本体１４及び抜脱防止スリーブ２０を合成樹脂材料により形成した。前記継手本体１４は略円筒状に形成されている。その継手本体１４の左端には管本体１１ａを接続するための接続筒部１４ａが形成され、右端は管体（図示せず）に接続可能に形成されている。接続筒部１４ａの外周面には雄ネジ１５が螺刻されている。また、継手本体１４の内部には円環状をなす第１当接面１６が形成され、同第１当接面１６にはゴム材料によりリング状に形成されたシール部材１７が装着されている。前記シール部材１７より継手本体１４の左端側の内周面には、円環状をなし、前記第１当接面１６より内径及び外径が大きい第２当接面１８が形成されている。
【００２８】
図３に示すように、前記接続筒部１４ａに螺合されて取り付けられる接続手段を形成する取着体としての抜脱防止スリーブ２０は略円筒状をなし、抜脱防止スリーブ２０の左端部は抜脱防止スリーブ２０の左端に向かうに連れて内径及び外径が縮径するように形成されている。抜脱防止スリーブ２０の左端には管本体１１ａの外径よりわずかに大きい直径を有する内孔２０ａが形成されている。また、図２に示すように、抜脱防止スリーブ２０の右側の内周面には前記雄ネジ１５に螺合可能な雌ネジ２０ｂが螺刻されている。
【００２９】
次に、図４に示すように、前記筒体１３を拡径する金属材料製の拡径治具２１について説明する。なお、拡径治具２１の以下の説明における上下左右は、図５における上下左右に対応する。図４及び図５に示すように、拡径治具２１は略円筒状に形成されたメインスリーブ２２を備え、そのメインスリーブ２２の左端側には円盤状をなすスリーブキャップ２３が螺着され、図５に示すように、スリーブキャップ２３の中央部には円孔２３ａが形成されている。メインスリーブ２２内にはボルト状をなす可動ボルト２４が、同可動ボルト２４の頭部側が前記スリーブキャップ２３側を向くように挿入されている。
【００３０】
この可動ボルト２４の頭部側端面の中央部には、メインスリーブ２２内への挿入状態で前記円孔２３ａと対応するように雌ネジ孔２４ａが形成されている。また、可動ボルト２４の頭部の外側面には、可動ボルト２４の軸線に沿って延びる係合溝２４ｂが形成され、可動ボルト２４の軸部の外周面には雄ネジ２４ｃが形成されている。
【００３１】
そして、メインスリーブ２２内に挿入された可動ボルト２４の軸部がメインスリーブ２２の右端側から突出した状態で、スペーサ２５を介装して雄ネジ２４ｃにナット２６が螺合されて、メインスリーブ２２に可動ボルト２４が取り付けられている。メインスリーブ２２に可動ボルト２４が取り付けられた状態で、メインスリーブ２２の外面から可動ボルト２４の係合溝２４ｂに係合ピン２７が係合するように取り付けられ、その係合ピン２７の係合溝２４ｂに対する係合により可動ボルト２４のメインスリーブ２２内での回転が規制されている。
【００３２】
メインスリーブ２２内の可動ボルト２４の雌ネジ孔２４ａには拡径シャフト２８の右端側に形成された雄ネジ２８ａが螺合されて可動ボルト２４に拡径シャフト２８が取り付けられている。この拡径シャフト２８の左側は、同左側に向かうに連れて徐々に直径が拡径するように形成され、左端部は、一定の外径を有するように形成されている。その拡径シャフト２８の左端部の外径は管本体１１ａの内径よりわずかに小さく形成され、筒体１３の内径よりわずかに大きく形成されている。
【００３３】
次に、上記拡径治具２１を使用して通水管１１にシール構造及び接続用膨出部１１ｂを形成して端部構造１０を備えた通水管１１を形成し、その接続用膨出部１１ｂを使用して通水管１１と継手１２とを接続する方法について説明する。まず、図３に示すように、管本体１１ａに抜脱防止スリーブ２０を装着しておく。次に、拡径治具２１においてナット２６を可動ボルト２４から螺退させ同可動ボルト２４を頭部側端面がメインスリーブ２２のスリーブキャップ２３側内面に当接するまで移動させる。次いで、図４に示すように、拡径シャフト２８に筒体１３を装着した状態で、図５に示すように、拡径シャフト２８の雄ネジ２８ａを雌ネジ孔２４ａに螺合して、拡径シャフト２８を可動ボルト２４に取り付ける。
【００３４】
続いて、その筒体１３に管本体１１ａの端部を外嵌し、拡径シャフト２８に管本体１１ａを装着した状態で、ナット２６を可動ボルト２４に螺進させる。すると、図６に示すように、係合ピン２７と係合溝２４ｂとの係合により可動ボルト２４は回転しないため、係合ピン２７に係合溝２４ｂが沿うように可動ボルト２４はメインスリーブ２２の軸線に沿って同メインスリーブ２２内へ引き込まれていく。
【００３５】
その可動ボルト２４の移動と同時に、拡径シャフト２８がメインスリーブ２２内へ引き込まれていく。すると、筒体１３内に拡径シャフト２８の拡径部分が徐々に挿入されていき、その拡径部分により筒体１３が左側から右側に向かって徐々に外方へ押出されて拡径され、その拡径に伴い管本体１１ａも拡径される。このとき、管本体１１ａの内径よりわずかに小さい外径を有する拡径シャフト２８の左端部により拡径された筒体１３の内周面と管本体１１ａの非拡径部分における内径とがほぼ同じになる。
【００３６】
管本体１１ａと筒体１３とが同時に拡径されることにより、図１に示すように、筒体１３の外周面は管本体１１ａの端部の内周面に圧接し、筒体１３の外周面と管本体１１ａの端部の内周面との間に流体の漏れを防止するシール構造が形成される。また、管本体１１ａの端部には拡径された筒体１３により管本体１１ａの端部の外面に外方へ突出する接続用膨出部１１ｂが形成される。そして、管本体１１ａの端部に前記シール構造と接続用膨出部１１ｂとよりなる端部構造１０を備えた通水管１１が形成される。
【００３７】
さて、前記継手１２と通水管１１とを接続するには、まず、図２に示すように、管本体１１ａの接続用膨出部１１ｂが形成された側の端部を接続筒部１４ａ内に挿入し、管本体１１ａの右端面を第２当接面１８に当接させるとともに、管本体１１ａ及び筒体１３の右端面をシール部材１７に当接させる。続いて、抜脱防止スリーブ２０の雌ネジ２０ｂを雄ネジ１５に螺合して抜脱防止スリーブ２０を継手本体１４に取付けることにより、継手１２が形成される。このとき、抜脱防止スリーブ２０の内孔２０ａの直径は管本体１１ａの非拡径部分における外径とほぼ同じに形成されているため、拡径により形成された接続用膨出部１１ｂの外径より小さくなっている。
【００３８】
そのため、継手本体１４に対する抜脱防止スリーブ２０の取付状態で、係合部としての抜脱防止スリーブ２０の左側の内周縁に接続用膨出部１１ｂが係合して抜脱防止スリーブ２０から管本体１１ａが抜け出ることが防止される。その結果、接続筒部１４ａと抜脱防止スリーブ２０とにより通水管１１と継手１２との接続構造が形成される。そして、端部構造１０を備えた通水管１１を、継手１２に接続するために管本体１１ａの端部と継手１２の接続筒部１４ａとの間に形成された接続構造により、通水管１１が継手１２に抜け止めされた状態で接続される。
【００３９】
通水管１１と継手１２との接続状態において、シール部材１７により継手本体１４内へ流体が流入するのが防止され、前記シール構造により、管本体１１ａの内周面と筒体１３の外周面との間からの流体の漏れ出しが防止される。
【００４０】
従って、管本体１１ａと継手本体１４との間に流体が漏れ出ることが防止され、通水管１１と継手１２との間からの流体の漏れ出しを防止することができる。また、筒体１３の内径と管本体１１ａの非拡径部分における内径はほぼ同じに形成されているため、筒体１３による管本体１１ａ内を流通する流体の流量損失を小さくすることができる。
【００４１】
上記第１の実施形態によれば、以下のような特徴を得ることができる。
（１）接続筒部１４ａに接続された管本体１１ａの端部における流体の漏れ出しを防止するために、管本体１１ａと筒体１３とを同時に拡径して管本体１１ａの端部にシール構造が形成されている。そのため、接続体に接続された管本体の端部における流体の漏れ出しを防止するシール構造を形成するために管本体の内径を必要以上に拡径していた従来と異なり、管本体１１ａの端部に作用する負荷を最小限に抑えることができる。従って、管本体１１ａの端部が損傷を受けたり、変形したりする不具合を防止して通水管１１と継手１２との接続状態において、管本体１１ａの内周面と筒体１３の外周面との間からの流体の漏れ出しを防止することができる。
【００４２】
（２）筒体１３は内側から拡径されるため、筒体１３の外周面は管本体１１ａの内周面に圧接することになる。従って、管本体１１ａと筒体１３との間にシール構造を形成して流体の漏れ出しを防止することができ、通水管１１と継手１２との間からの流体の漏れ出しを防止することができる。
【００４３】
（３）筒体１３を拡径するとともに、管本体１１ａを拡径して通水管１１に端部構造１０を形成することができる。従って、管本体を拡径した後、工具を使用して固定リングを管本体の拡径された端部側へ強制的にスライド移動させていた従来と異なり、管本体１１ａにシール構造を容易に形成することができる。
【００４４】
（４）筒体１３及び管本体１１ａを同時に拡径することにより、管本体１１ａの外面に接続用膨出部１１ｂを形成することができ、その接続用膨出部１１ｂと抜脱防止スリーブ２０の内周面との係合により通水管１１を継手１２に抜け止めした状態に接続することができる。従って、管本体を接続体に接続するために、管本体を拡径して接続体に管本体の端部を外嵌し、固定リングにより管本体の端部を締付いていた従来と異なり、管本体１１ａと接続筒部１４ａとの接続、即ち、通水管１１と継手１２との接続を容易に行うことができる。
【００４５】
（５）管本体１１ａの端部は、筒体１３の内径と管本体１１ａの非拡径部分の内径とがほぼ同じになるように拡径されているため、管本体１１ａ内を流通する流体の筒体１３による流量損失を小さくすることができる。
【００４６】
（６）筒体１３は金属材料により形成されているため、筒体１３の拡径後に、筒体１３が縮径したり、変形したりするおそれをなくすことができ、管本体１１ａの内周面と筒体１３の外周面との間のシール機能及び接続用膨出部１１ｂを維持することができる。従って、管本体１１ａの内周面と筒体１３の外周面との間からの流体の漏れ出しを確実に防止することができるとともに、通水管１１と継手１２との接続を確実に維持することができる。また、円環状をなす筒体１３を拡径して接続用膨出部１１ｂを形成するため、拡径治具を使用して管本体を拡径していた従来と異なり、管本体１１ａの端部をほぼ真円に近い状態に拡径することができる。従って、接続用膨出部１１ｂと抜脱防止スリーブ２０の左側の内周縁とを確実に係合させることができ、通水管１１と継手１２との接続を確実に維持することができる。
【００４７】
（７）継手本体１４に螺合された抜脱防止スリーブ２０の左側の内周縁に接続用膨出部１１ｂが係合して抜脱防止スリーブ２０から管本体１１ａが抜け出ることが防止される。即ち、通水管１１を継手１２に抜け止めされた状態で容易に接続することができる。
【００４８】
（８）以下のような管本体１１ａの拡径用の工具を使用する場合に発生する不具合の発生を防止することができる。前記拡径用の工具は、４つの分割体の集合体を備え、前記集合体が管本体１１ａ内に挿入されて拡径作業が行われる。即ち、前記集合体の挿入状態で、集合体の中心に棒材が挿入されると、４つの分割体が外方へ押し出され、集合体全体が押し広げられることにより管本体１１ａの端部が各分割体によって直接的に拡径される。そのため、各分割体と対応する管本体１１ａの内周面は外方へ押し出されるが、分割体同士の隙間と対応する位置は拡径されない。その結果、拡径後の管本体１１ａの端部には、拡径部位と非拡径部位とが形成されて管本体１１ａが周方向に均一に拡径されず、通水管１１を継手１２に接続したとき、管本体１１ａの端面全体にシール部材１７全体が密接しなくなり通水管１１と継手１２との間から流体が漏れ出る不具合が発生してしまう。これに対し、本実施形態では、拡径シャフト２８により筒体１３は周方向全体に均一に拡径されるため、管本体１１ａの端部は周方向全体へ均一に拡径される。従って、上記工具を使用した場合と異なり、シール部材１７に対しほぼ真円状の管本体１１ａ及び筒体１３の端面が確実に密接して通水管１１と継手１２との間から流体が漏れ出る不具合の発生を防止することができる。また、上記工具を使用して管本体１１ａを直接的に拡径する場合のように、拡径治具の外面等によって管本体１１ａの内面が損傷を受ける不具合の発生も防止することができる。また、筒体１３により、その筒体１３が内嵌された管本体１１ａの内周面が保護されている。そのため、筒体１３により管本体１１ａの端部が熱変形等する虞を無くすことができる。
【００４９】
（第２の実施形態）
以下、本発明を具体化した通水管の端部構造、同端部構造を備えた通水管並びに同通水管と接続体との接続構造及び通水管の端部構造の形成方法の第２の実施形態を図７〜図１１に従って説明する。なお、第２の実施形態は、第１の実施形態の端部構造及び接続体を変更したのみの構成であるため、同様の部分についてはその詳細な説明を省略する。また、第２の実施形態の以下の説明における上下左右は、図７及び図８における上下左右に対応する。
【００５０】
図７に示すように、通水管１１の端部構造１０は、管本体１１ａの右端部に設けられたインナー体としてのインナースリーブ３１と、管本体１１ａの右端部の外側に装着されるアウター体としてのアウタースリーブ３２とより形成されている。そして、通水管１１の端部構造１０はインナースリーブ３１が拡径されることによりインナースリーブ３１の外周面と管本体１１ａの内周面との間及びアウタースリーブ３２の内周面と管本体１１ａの外周面との間にシール構造が形成されているものである。
【００５１】
図９（ａ）に示すように、金属材料製の前記インナースリーブ３１は円筒状をなすインナー部３１ａと、そのインナー部３１ａの右端縁に外方へ突出するように形成された係合鍔部３１ｂとより形成されている。インナー部３１ａの外径は管本体１１ａの内径よりわずかに小さく形成されて管本体１１ａ内に嵌入可能に形成されている。係合鍔部３１ｂにおける外径は管本体１１ａの内径より大きく形成され、管本体１１ａ内にインナー部３１ａが嵌入されたとき、管本体１１ａの端面が係合鍔部３１ｂに係合するように形成されている。
【００５２】
前記アウタースリーブ３２は架橋ポリエチレン等の合成樹脂材料により略円筒状に形成され、アウタースリーブ３２の軸線方向に沿った長さは前記インナースリーブ３１の軸線方向に沿った長さより長く形成されている。なお、第２の実施形態ではアウタースリーブ３２を合成樹脂材料により形成したが、銅等の軟質の金属材料により形成してもよい。
【００５３】
図８に示すように、アウタースリーブ３２の筒状部３２ａの右端の内周縁には同アウタースリーブ３２の周方向に沿って内方へ突出する内周鍔部３２ｂが形成され、外周縁にはアウタースリーブ３２の周方向に沿って外方へ突出する外周鍔部３２ｃが形成されている。なお、拡径前の筒状部３２ａの内径は拡径前の管本体１１ａの外径よりわずかに大きく形成され、拡径前の内周鍔部３２ｂの内径は拡径前の管本体１１ａの外径より小さく形成されている。
【００５４】
次に、第２の実施形態の接続体としての継手３０について説明する。図８及び図９（ａ）に示すように、継手３０は合成樹脂材料又は金属材料製の継手本体３４及び抜脱防止スリーブ３５より形成されている。この第２の実施形態では、前記継手本体３４及び抜脱防止スリーブ３５を合成樹脂材料により形成した。前記継手本体３４は筒状に形成され、両端側（図８では左端側のみ図示）にそれぞれ管本体１１ａを接続可能な接続筒部３４ａが形成されている。図８に示すように、接続筒部３４ａの内周面にはそれぞれ雌ネジ３４ｂが形成されている。また、継手本体３４内の中央部には継手本体３４の周方向に沿って内方へ突出する当接面３４ｃが形成され、その当接面３４ｃの両面（図８では一面のみ図示）にはそれぞれ一対ずつシール部材１７が装着されている。なお、シール部材１７は当接面３４ｃに一つだけ装着してもよい。
【００５５】
図９（ａ）に示すように、接続筒部３４ａに設けられる接続手段としての抜脱防止スリーブ３５は略ボルト状に形成され、図９（ｂ）に示すように、一対の分割体３５ａを組付けることにより形成されている。分割体３５ａ同士は一側縁同士が連結されて一体化され、その連結部を中心として分割体３５ａ同士を離間又は組付け可能に形成されている。
【００５６】
また、抜脱防止スリーブ３５の内周面には、抜脱防止スリーブ３５を管本体１１ａの外周面に装着したとき、管本体１１ａに形成される接続用膨出部１１ｂに係合する係合部としての係合段部３５ｂが抜脱防止スリーブ３５の周方向に沿って形成されている。さらに、図８に示すように、抜脱防止スリーブ３５の右端側の外周面には前記継手本体３４の雌ネジ３４ｂに螺合可能な雄ネジ３５ｃが螺刻されている。
【００５７】
次に、前記拡径治具２１を使用して通水管１１にシール構造及び接続用膨出部１１ｂを形成して端部構造１０を形成し、その接続用膨出部１１ｂを使用して通水管１１と継手３０とを接続する方法について説明する。まず、図１０に示すように、拡径シャフト２８にインナースリーブ３１を装着し、その拡径シャフト２８を可動ボルト２４に取付ける。続いて、管本体１１ａの端部の外側にアウタースリーブ３２を装着し、内周鍔部３２ｂを管本体１１ａの端面に係合させる。
【００５８】
さらに、拡径シャフト２８に装着された前記インナースリーブ３１に管本体１１ａを外嵌して、インナー部３１ａを管本体１１ａ内に挿入するとともに、管本体１１ａの端面を係合鍔部３１ｂに係合させる。続いて、図１１に示すように、前記拡径治具２１を使用してインナースリーブ３１の内径と管本体１１ａの非拡径部分における内径とが同じとなるように管本体１１ａの端部を拡径する。すると、インナースリーブ３１全体が拡径シャフト２８により拡径されると同時に、管本体１１ａ及びアウタースリーブ３２の右側が拡径される。
【００５９】
その結果、インナースリーブ３１の外周面は管本体１１ａの端部の内周面に圧接し、インナースリーブ３１の外周面と管本体１１ａの端部の内周面との間に流体の漏れを防止するシール構造が形成される。また、拡径された管本体１１ａの外周面はアウタースリーブ３２の内周面に圧接し、さらに、アウタースリーブ３２は拡径されると拡径状態からの自己の収縮に伴う縮径により管本体１１ａの外周面に圧接する。
【００６０】
そして、アウタースリーブ３２の内周面と管本体１１ａの外周面との間に流体の漏れを防止するシール構造が形成される。それと同時に、アウタースリーブ３２の右側が拡径されることにより、同アウタースリーブ３２の右側の外周面に外方へ突出する接続用膨出部１１ｂが形成される。即ち、管本体１１ａの右端部にシール構造及び接続用膨出部１１ｂを備えた通水管１１の端部構造１０が形成される。
【００６１】
次いで、図８に示すように、管本体１１ａの外面に一対の分割体３５ａを組付けて抜脱防止スリーブ３５を管本体１１ａに取り付ける。次に、管本体１１ａの接続用膨出部１１ｂが形成された側の端部を接続筒部３４ａ内に挿入し、さらに、抜脱防止スリーブ３５の雄ネジ３５ｃを継手本体３４の雌ネジ３４ｂに螺合して継手３０を形成する。
【００６２】
そして、抜脱防止スリーブ３５の右端面がアウタースリーブ３２の外周鍔部３２ｃに当接し、同外周鍔部３２ｃが抜脱防止スリーブ３５と当接面３４ｃとの間に挟持されてアウタースリーブ３２が継手本体３４内に位置決め固定される。このとき、アウタースリーブ３２の外面に形成された接続用膨出部１１ｂと抜脱防止スリーブ３５の係合段部３５ｂとが係合する。また、外周鍔部３２ｃが接続用膨出部１１ｂとして機能し、外周鍔部３２ｃに抜脱防止スリーブ３５の右端面が係合する。
【００６３】
その結果、接続用膨出部１１ｂに係合した係合段部３５ｂを備えた抜脱防止スリーブ３５が継手本体３４に取り付けられることにより、管本体１１ａの継手本体３４からの抜け出しが防止される。即ち、上記抜脱防止スリーブ３５と、継手本体３４の接続筒部３４ａとにより通水管１１と継手３０との接続構造が形成される。そして、端部構造１０を備えた通水管１１を、継手３０に接続するために管本体１１ａの端部と継手３０の接続筒部３４ａとの間に形成された接続構造により、通水管１１が継手３０に抜け止めされた状態で接続される。
【００６４】
通水管１１と継手３０との接続状態において、継手本体３４の内周側のシール部材１７により管本体１１ａ内から継手本体３４内へ流体が流入するのが防止される。同時に、管本体１１ａの内周面とインナースリーブ３１との間のシール構造により、流体が当接面３４ｃ側へ漏れ出ることが防止される。また、万一、流体が当接面３４ｃ側へ漏れ出たとしても、管本体１１ａの外周面とアウタースリーブ３２の内周面との間のシール構造により抜脱防止スリーブ３５の左端側へ流体が漏れ出ることが防止される。さらに、継手本体３４の外周側のシール部材１７により接続筒部３４ａの内周面とアウタースリーブ３２の外周面との間から流体が漏れ出ることが防止される。従って、通水管１１と継手３０との間からの流体の漏れ出しを防止することができる。さらに、インナースリーブ３１の係合鍔部３１ｂ及びアウタースリーブ３２の内周鍔部３２ｂにより、管本体１１ａの端面が斜状や凹凸状に切断されていても管本体１１ａの端面を保護することができる。そのため、管本体１１ａの接続筒部３４ａ内への挿入時にシール部材１７を損傷させてしまう虞を無くすことができる。
【００６５】
また、インナースリーブ３１の内径と管本体１１ａの非拡径部分における内径はほぼ同じに形成されているため、インナースリーブ３１による管本体１１ａ内を流通する流体の流量損失を小さくすることができる。また、インナースリーブ３１及びアウタースリーブ３２を同時に拡径するため、管本体１１ａにシール構造を形成する作業を速やかかつ容易に行うことができ、通水管１１と継手３０との接続作業の簡易化を図ることができる。さらに、アウタースリーブ３２が拡径されることにより、管本体１１ａには接続用膨出部１１ｂが形成される。そのため、管本体１１ａに接続用膨出部１１ｂを形成する作業を、管本体１１ａにシール構造を形成する作業と別に行う場合と比較して、管本体１１ａのシール構造の形成作業、さらには通水管１１と継手３０との接続作業を速やかかつ容易に行うことができる。
【００６６】
（第３の実施形態）
以下、本発明を具体化した通水管の端部構造、同端部構造を備えた通水管並びに同通水管と接続体との接続構造及び通水管の端部構造の形成方法の第３の実施形態を図１２及び図１３に従って説明する。なお、第３の実施形態は、第１の実施形態の端部構造及び接続体を変更したのみの構成であるため、同様の部分についてはその詳細な説明を省略する。また、第３の実施形態の以下の説明における上下左右は、図１２における上下左右に対応する。
【００６７】
図１２に示すように、通水管１１の端部構造１０は、管本体１１ａの右端部に設けられたインナー体としてのインナーリング３７と、管本体１１ａの右端部の外側に装着されるアウター体としてのアウターリング３８とより形成されている。そして、通水管１１の端部構造１０は、インナーリング３７が拡径されることによりインナーリング３７の外周面と管本体１１ａの内周面との間及びアウターリング３８の内周面と管本体１１ａの外周面との間にシール構造が形成されたものである。
【００６８】
図１３（ａ）に示すように、前記インナーリング３７は金属材料により円筒状に形成され、拡径前のインナーリング３７の外径は拡径前の管本体１１ａの内径よりわずかに小さく形成されている。前記アウターリング３８は合成樹脂材料により円筒状に形成され、拡径前のアウターリング３８の内径は拡径前の管本体１１ａの外径よりわずかに大きく形成されている。また、インナーリング３７とアウターリング３８の軸線方向に沿った長さはほぼ同じに形成されている。なお、第３の実施形態ではアウターリング３８を合成樹脂材料により形成したが、銅等の軟質の金属材料により形成してもよい。
【００６９】
図１２及び図１３（ａ）に示すように、前記継手３６は合成樹脂材料又は金属材料製の継手本体３９、係合スリーブ４０及び固定スリーブ４１より形成されている。この第３の実施形態では、前記継手本体３９、係合スリーブ４０及び固定スリーブ４１を合成樹脂材料により形成した。前記継手本体３９の左端には管本体１１ａを接続するための接続筒部３９ａが形成され、右端は管体（図示せず）に接続可能に形成されている。接続筒部３９ａの外周面には雄ネジ３９ｂが螺刻され、継手本体３９の内部には円環状をなす当接面３９ｃが形成されているとともに、同当接面３９ｃにはシール部材１７が装着されている。図１３（ａ）に示すように、前記接続筒部３９ａに設けられる接続手段を形成する係合体としての係合スリーブ４０は略円筒状に形成され、１３（ｂ）に示すように、一対の分割体４０ａを組付けることにより形成されている。
【００７０】
分割体４０ａ同士は各分割体４０ａの一側縁同士が連結されて一体化され、その連結部を中心として分割体４０ａ同士を離間又は組付け可能に形成されている。図１２に示すように、係合スリーブ４０は右側の内径及び外径が左側より大きく形成されて係合スリーブ４０内には係合部としての係合面４０ｂが形成されている。
【００７１】
前記接続筒部３９ａに設けられる接続手段を形成する取着体としての固定スリーブ４１は略円筒状をなし、左端側には前記係合スリーブ４０の左側における外径よりわずかに大きい直径を有する内孔４１ａが形成されている。さらに、固定スリーブ４１の右側の内周面には継手本体３９の雄ネジ３９ｂに螺合可能な雌ネジ４１ｂが螺刻されている。
【００７２】
次に、前記拡径治具２１を使用して通水管１１にシール構造及び接続用膨出部１１ｂを形成して端部構造１０を形成し、その接続用膨出部１１ｂを使用して通水管１１と継手３６とを接続する方法について説明する。まず、固定スリーブ４１を管本体１１ａに装着しておく。続いて、第２の実施形態と同様に、拡径シャフト２８にインナーリング３７を装着した後、アウターリング３８が装着された管本体１１ａを外嵌する。
【００７３】
続いて、前記拡径治具２１を使用してインナーリング３７の内径と管本体１１ａの非拡径部分における内径とがほぼ同一となるようにインナーリング３７、管本体１１ａ及びアウターリング３８を拡径する。すると、図１２に示すように、インナーリング３７が拡径されることにより同インナーリング３７の外周面は管本体１１ａの端部の内周面に圧接し、インナーリング３７の外周面と管本体１１ａの端部の内周面との間に流体の漏れを防止するシール構造が形成される。
【００７４】
また、拡径された管本体１１ａの外周面はアウターリング３８の内周面に圧接するとともに、そのアウターリング３８は自己の収縮に伴う縮径により管本体１１ａの外周面に圧接する。その結果、アウターリング３８の内周面と管本体１１ａの外周面との間に流体の漏れを防止するシール構造が形成される。加えて、アウターリング３８全体が拡径されることにより、管本体１１ａには管本体１１ａの外面より外方へ突出する接続用膨出部１１ｂが形成される。そして、管本体１１ａにシール構造及び接続用膨出部１１ｂよりなる端部構造１０を備えた通水管１１が形成される。
【００７５】
次いで、図１２に示すように、管本体１１ａの外面に一対の分割体４０ａを組付け、係合スリーブ４０を管本体１１ａに取り付ける。次に、管本体１１ａの接続用膨出部１１ｂが形成された側の端部を接続筒部３９ａ内に挿入し、さらに、固定スリーブ４１の雌ネジ４１ｂを継手本体３９の雄ネジ３９ｂに螺合することにより継手３６が形成される。
【００７６】
すると、係合スリーブ４０の外周面に固定スリーブ４１の内周縁部が係合して係合スリーブ４０が継手本体３９内方へ移動され、継手本体３９の左端面に係合スリーブ４０の右端面が当接する。そして、管本体１１ａの右端面がシール部材１７に圧接し、さらに、継手本体３９と固定スリーブ４１との間に係合スリーブ４０が挟持されるとともに、接続用膨出部１１ｂと係合スリーブ４０の係合面４０ｂとが係合する。
【００７７】
その結果、固定スリーブ４１内に係合スリーブ４０が保持され、係合スリーブ４０の係合面４０ｂと接続用膨出部１１ｂとの係合が維持される。即ち、継手３６内に位置決めされた係合スリーブ４０の係合面４０ｂに接続用膨出部１１ｂが係合するため、通水管１１が継手３６に抜け止めされた状態で接続される。そして、係合スリーブ４０と、固定スリーブ４１と、接続筒部３９ａとにより通水管１１と継手３６との接続構造が形成される。即ち、端部構造１０を備えた通水管１１を、継手３６に接続するために管本体１１ａの端部と継手３６の接続筒部３９ａとの間に形成された接続構造により、通水管１１が継手３６に抜け止めされた状態で接続される。
【００７８】
従って、第３の実施形態において、第２の実施形態と同様に、シール部材１７により継手本体３９内へ流体が流入するのが防止される。それと同時に、管本体１１ａの内周面とインナーリング３７の外周面との間のシール構造により、流体が当接面３９ｃ側へ漏れ出ることが防止される。万一、流体が当接面３９ｃ側へ漏れ出て、接続筒部３９ａ内周面側へ漏れ出たとしても、管本体１１ａの外周面とアウターリング３８の内周面との間のシール構造により、流体が係合スリーブ４０側へ漏れ出ることが防止される。その結果、通水管１１と継手３６との間からの流体の漏れ出しを防止することができる。また、インナーリング３７による管本体１１ａ内を流通する流体の流量損失を小さくすることができる。
【００７９】
さらに、管本体１１ａをわずかに拡径するだけでアウターリング３８により管本体１１ａに接続用膨出部１１ｂを形成することができる。従って、管本体１１ａと接続筒部３９ａとの接続作業、即ち通水管１１と継手３６との接続作業を速やかかつ容易に行うことができる。加えて、係合スリーブ４０は一対の分割体４０ａを組付けることにより形成されるため、管本体１１ａに接続用膨出部１１ｂが形成された後に通水管１１に係合スリーブ４０を取り付けることができる。従って、通水管１１に係合スリーブ４０を取り付けた後、係合面４０ｂに接続用膨出部１１ｂが係合するようにインナーリング３７を拡径する必要がなく、係合スリーブ４０の通水管１１に対する取付作業、さらには通水管１１と継手３６との接続作業を速やかに行うことができる。
【００８０】
なお、前記各実施形態は以下のように変更してもよい。
・ 第１の実施形態において、拡径された筒体１３の内径が管本体１１ａの非拡径部分における内径より小さい又は大きくなるように筒体１３を拡径してもよい。
【００８１】
・ 第１の実施形態において、管本体１１ａの外側に合成樹脂材料製若しくは軟質の金属材料製のアウター体として、第２の実施形態のアウタースリーブ３２又は第３の実施形態のアウターリング３８を装着して、管本体１１ａの内外両周面にシール構造を形成してもよい。
【００８２】
・ 第２の実施形態において、インナースリーブ３１の軸線方向への長さと、アウタースリーブ３２の軸線方向への長さがほぼ同じになるように形成する。そして、インナースリーブ３１、管本体１１ａ及びアウタースリーブ３２を拡径したとき、アウタースリーブ３２全体が拡径されてアウタースリーブ３２の端面により接続用膨出部１１ｂを形成してもよい。
【００８３】
・ 第２の実施形態において、拡径されたインナースリーブ３１の内径が管本体１１ａの非拡径部分における内径より小さい又は大きくなるようにインナースリーブ３１を拡径してもよい。
【００８４】
・ 第２の実施形態において、抜脱防止スリーブ３５を分割体３５ａに分割せず、一体形成してもよい。
・ 第２の実施形態において、アウタースリーブ３２を省略し、管本体１１ａの内周面のみにシール構造を形成してもよい。このとき、インナースリーブ３１及び管本体１１ａの拡径により、管本体１１ａの外面に形成された接続用膨出部１１ｂと抜脱防止スリーブ３５の係合段部３５ｂとを係合させてもよい。
【００８５】
・ 第２の実施形態において、インナースリーブ３１とアウタースリーブ３２とを一体化してもよい。
・ 第２の実施形態の継手３０の代わりに図１４及び図１５に示す継手４６を使用してもよい。この継手４６は合成樹脂材料又は金属材料製の継手本体４７、接続手段のうちの取着体を形成するピン体としての取付ピン４８及び係合体としての取付筒体４９より主に形成されている。この場合は、継手本体４７、取付ピン４８及び取付筒体４９を合成樹脂材料により形成した。なお、上記通水管１１、継手本体４７、取付ピン４８及び取付筒体４９の説明における上下左右は、図１４における上下左右に対応する。
【００８６】
図１４及び図１５に示すように、前記継手本体４７は略円筒状に形成され、継手本体４７の左端部には接続筒部４７ａが形成され、右端に管体（図示せず）を接続可能に形成されている。接続筒部４７ａの左端面の相対向する位置には収容凹部４７ｂが凹設されている。また、接続筒部４７ａの左端部の相対向する位置には前記収容凹部４７ｂを横断する状態で前記取付ピン４８を接続筒部４７ａに取付可能とする取付孔４７ｃが形成されている。
【００８７】
この取付孔４７ｃの内周面には雌ネジ（図示せず）が螺刻され、取付ピン４８に形成された雄ネジ４８ａと螺合可能に形成されている。図１４に示すように、継手本体４７の中央部の内周面には、同継手本体４７の周方向に沿って延びる係止面４７ｄが形成され、その係止面４７ｄにはシール部材１７が装着されている。図１５に示すように、前記取付筒体４９は略円筒状に形成され、その左側の外周縁の相対向する位置には、取付筒体４９の軸線に対して直交するように外方へ延び、さらに前記軸線に平行に延びる係合片４９ａが形成されている。
【００８８】
さて、上記継手４６に通水管１１を接続するには、まず、管本体１１ａに取付筒体４９を取り付けた後、第２の実施形態と同様に、管本体１１ａの端部にシール構造を形成する。このとき、アウタースリーブ３２の外周鍔部３２ｃにより管本体１１ａに接続用膨出部１１ｂが形成される。次に、管本体１１ａのシール構造が形成された側の端部を接続筒部４７ａ内に挿入し、さらに、取付筒体４９の係合片４９ａが形成されていない側を接続筒部４７ａ内に挿入し、係合片４９ａを収容凹部４７ｂに収容する。そして、各取付孔４７ｃに取付ピン４８を挿入し、取付孔４７ｃの雌ネジに雄ネジ４８ａを螺合して取付ピン４８を接続筒部４７ａに取り付けると継手４６が形成される。
【００８９】
図１４に示すように、取付ピン４８により係合片４９ａが接続筒部４７ａ内方へ押圧され、係合部としての取付筒体４９の右端面が、接続用膨出部１１ｂとしてのアウタースリーブ３２の外周鍔部３２ｃに係合するとともに、同外周鍔部３２ｃが取付筒体４９の右端面と接続筒部４７ａ内面との間に挟持される。その結果、取付ピン４８により取付筒体４９が継手本体４７内から抜脱しないように位置決めされ、その取付筒体４９によりアウタースリーブ３２が継手本体４７内に位置決め固定される。そのため、管本体１１ａが接続筒部４７ａに接続されて管本体１１ａの継手本体４７からの抜け出しが防止される。即ち、接続筒部４７ａと、取付筒体４９と、取付ピン４８とにより、通水管１１と４６との接続構造が形成される。そして、端部構造１０を備えた通水管１１を、継手４６に接続するために管本体１１ａの端部と継手４６の接続筒部４７ａとの間に形成された接続構造により、通水管１１が継手４６に抜け止めされた状態で接続される。
【００９０】
・ 第３の実施形態において、拡径されたインナーリング３７の内径が管本体１１ａの非拡径部分における内径より小さい又は大きくなるようにインナーリング３７を拡径してもよい。
【００９１】
・ 第３の実施形態において、管本体１１ａに装着され、接続用膨出部１１ｂを形成して拡径された状態のアウターリング３８の外径より固定スリーブ４１の内孔４１ａの直径を大きく形成してもよい。このように構成した場合、管本体１１ａに接続用膨出部１１ｂを形成した後にも固定スリーブ４１を接続用膨出部１１ｂが形成された側の端部から接続用膨出部１１ｂの外側を通過させて管本体１１ａに装着することができる。従って、内孔４１ａの直径がアウターリング３８により形成された接続用膨出部１１ｂの外径より小さく形成され、接続用膨出部１１ｂを形成する前に固定スリーブ４１を管本体１１ａに装着しておかなければならない場合と比較して通水管１１と継手３６との接続作業を速やかに行うことができる。
【００９２】
・ 第３の実施形態において、アウターリング３８を省略して管本体１１ａの内周面のみにシール構造を形成してもよい。このように構成した場合、インナーリング３７の拡径により管本体１１ａの外面に形成された接続用膨出部１１ｂと係合面４０ｂとの係合により通水管１１と継手３６とが接続される。
【００９３】
・ 第３の実施形態において、係合スリーブ４０を分割体４０ａに分割せず、一体形成してもよい。
・ 図１６に示す端部構造１０を備えた通水管１１と接続体としての継手５０とを接続してもよい。この継手５０は継手本体５１、接続手段の抜脱防止スリーブとしての取付スリーブ５２より主に形成されている。なお、上記通水管１１、継手本体５１及び取付スリーブ５２の説明における上下左右は、図１６における上下左右に対応する。管本体１１ａの右端部に設けられたインナー体としての接続筒体５３は、金属材料により円筒状に形成され、その右端縁の外周面には外方へ拡径しながら延びる延出部５３ａが固定部として形成されている。合成樹脂材料又は金属材料製の前記継手本体５１は略円筒状に形成され、継手本体５１の左端には接続筒部５１ａが形成され、右端に管体（図示せず）を接続可能に形成されている。接続筒部５１ａの左端面は継手本体５１の中央部側へ向かうに連れて拡径するようにテーパ状に形成され、接続筒部５１ａの外周面には雄ネジ５１ｂが螺刻されている。
【００９４】
前記取付スリーブ５２は合成樹脂材料又は金属材料により略円筒状に形成され、その取付スリーブ５２の中央部の内周面には周方向に沿って延びる係止段部５２ａが係合部として形成されている。また、取付スリーブ５２の右側の内周面には前記雄ネジ５１ｂに螺合可能な雌ネジ５２ｂが螺刻されている。
【００９５】
さて、上記継手５０に通水管１１を接続するには、まず、管本体１１ａに取付スリーブ５２を予め装着しておく。続けて、管本体１１ａの内側に挿入された接続筒体５３が拡径されて管本体１１ａの内周面にシール構造が形成されるとともに、管本体１１ａの外周面に接続用膨出部１１ｂが形成されて端部構造１０を備えた通水管１１が形成される。次に、延出部５３ａの内周面を継手本体５１の左端面に当接させ、その当接状態で取付スリーブ５２を継手本体５１に螺合して継手５０が形成される。
【００９６】
このとき、継手本体５１に取り付けられた取付スリーブ５２の係合部としての内周縁に接続用膨出部１１ｂが係合するため、継手５０から管本体１１ａが抜け出ることが防止される。即ち、端部構造１０を備えた通水管１１を、継手５０に接続するために管本体１１ａの端部と継手５０の接続筒部５１ａとの間に形成された接続構造により、通水管１１が継手５０に抜け止めされた状態で接続される。
【００９７】
通水管１１の継手５０に対する接続状態において、継手本体５１の左端面と取付スリーブ５２の係止段部５２ａとの間に延出部５３ａが挟持され、同延出部５３ａの内周面と継手本体５１の左端面とが互いに圧接してシール構造が形成されている。そのため、延出部５３ａと継手本体５１の左端面との間のシール構造により継手５０内への流体の漏れ出しを防止することができる。さらに、管本体１１ａの内周面と接続筒体５３の内周面との間のシール構造により管本体１１ａと接続筒体５３との間から管本体１１ａと継手本体５１との間への流体の漏れ出しを防止することができる。
【００９８】
・ 図１７に示すインナー体としての接続部材５４を管本体１１ａに取り付けて通水管１１にシール構造を形成してもよい。前記接続部材５４は金属材料により略円筒状に形成されている。接続部材５４の一端の外周縁には接続部材５４の周方向に沿って外方へ突出する接続鍔部５４ｂが固定部として形成され、その接続鍔部５４ｂにはボルト５５を挿通可能な挿通孔５４ｃが２箇所に形成されている。
【００９９】
さて、接続部材５４が管本体１１ａの右端部の内側に挿入された状態で、接続部材５４を拡径する。すると、管本体１１ａの内周面に接続部材５４が圧接し、管本体１１ａの内周面にシール構造が形成され、端部構造１０を備えた通水管１１が形成される。
【０１００】
上記通水管１１を接続体として接続部材５４を備えた別の通水管１１に接続するには、各接続部材５４の挿通孔５４ｃにボルト５５を挿通し、各ボルト５５にナット５６を螺合して接続部材５４同士を接続固定する。その結果、通水管１１同士を接続することができる。なお、シール構造が予め形成され、端部構造１０を備えた通水管１１を施工現場に搬入し、施工現場で通水管１１同士を接続してもよい。
【０１０１】
・ 第１〜第３の実施形態において、管本体１１ａの一端部にシール構造及び接続用膨出部１１ｂを形成したが、管本体１１ａの両端部にシール構造及び接続用膨出部１１ｂを形成してもよい。
【０１０２】
・ 第１〜第３の実施形態において、図１８に示す拡径工具６０を使用してインナー体を拡径してもよい。図１８に示すように、前記拡径工具６０は、例えば第１の実施形態の筒体１３と、管本体１１ａの端部内に挿入される引抜体６２とより主に形成されている。前記引抜体６２は金属材料により筒状に形成され、図１８において、引抜体６２の左端部には、同引抜体６２の軸線方向に沿って一定の外径を有する拡径部６２ａが形成されている。この拡径部６２ａの外径は筒体１３の内径より大きく形成されている。さらに、引抜体６２は、拡径部６２ａから同引抜体６２の右端側に向かうに連れて外径が縮径するようにテーパ状に形成されている。
【０１０３】
また、引抜体６２には同引抜体６２を管本体１１ａ内から引き抜く作業を行うための引抜ピン６３が取り付けられている。この引抜ピン６３は、引抜体６２内に配置された引抜ピン６３の頭部６３ａが引抜体６２の右端側の内周縁部に係止することにより引抜ピン６３が引抜体６２の右側から抜け外れないように取り付けられている。そして、前記引抜体６２が前記筒体１３の内側に挿入されて、同筒体１３と引抜体６２とが一体化されている。
【０１０４】
次に、前記拡径工具６０を使用して通水管１１にシール構造を形成する方法について説明する。まず、図１８に示すように、拡径工具６０の引抜体６２及び筒体１３を管本体１１ａ内に挿入する。続いて、専用の引抜き工具を使用し、引抜ピン６３を管本体１１ａから離れる方向へ引っ張ると、その引抜ピン６３の移動により頭部６３ａが係止した引抜体６２が管本体１１ａから離れる方向へ引っ張られる。すると、引抜体６２は、同引抜体６２の左端側へ向かうに連れて外周面の外径が拡径しているため、引抜体６２が移動するに連れて筒体１３の内周面に接触する引抜体６２の外径は大きくなり、筒体１３は拡径されていく。そして、筒体１３が内側から拡径されることにより、図１９に示すように、筒体１３の外周面と管本体１１ａの内周面との間にシール構造が形成される。さらに引抜ピン６３を引っ張ると、筒体１３は管本体１１ａの内周面に圧接しているため、筒体１３は管本体１１ａ内に残存し、引抜体６２が管本体１１ａ内から引抜かれる。その結果、筒体１３により管本体１１ａの端部にシール構造及び接続用膨出部１１ｂが形成され、端部構造１０を備えた通水管１１が形成される。
【０１０５】
・ 第１〜第３の実施形態では、接続体と通水管１１とを接続する際に、通水管１１にシール構造を形成したが、管本体１１ａにシール構造が予め形成された通水管１１を形成してもよい。そして、端部構造１０が形成された通水管１１を、その通水管１１の施工現場に搬入して、シール構造が予め形成された通水管１１と接続体とを接続してもよい。このとき、通水管１１には接続用膨出部１１ｂが形成されているため、その接続用膨出部１１ｂが接続の妨げとならないように形成された接続体を使用するのが好ましい。例えば、図２０に示すように、第１の実施形態の継手１２とほぼ同じ構造を有する継手７０を使用する。この継手７０は第１の実施形態の継手本体１４を備えるとともに、合成樹脂材料又は金属材料製の取着体としての固定スリーブ７１及び係合体としての係合スリーブ７２を備えている。
【０１０６】
前記係合スリーブ７２は、図示しないが、半筒状をなす一対の分割体を組付けることにより形成されている。分割体同士は一側縁同士が連結されることにより一体化され、その連結部を中心として分割体同士を離間又は組付け可能に形成されている。また、係合スリーブ７２の内周面には、係合スリーブ７２を管本体１１ａの外周面に装着したとき、前記接続用膨出部１１ｂが係合可能な係合部としての係合段部７２ｂが係合スリーブ７２の周方向に沿って形成されている。前記固定スリーブ７１の左端側には、前記係合スリーブ７２の左端側の外径よりわずかに大きい直径を有する内孔７１ａが形成されている。前記内孔７１ａの直径は、管本体１１ａに形成された接続用膨出部１１ｂの外径よりわずかに大きく設定されている。
【０１０７】
さて、管本体１１ａの端部にシール構造及び接続用膨出部１１ｂが形成され、端部構造１０を備えた通水管１１を継手７０に接続するため、まず、管本体１１ａの接続用膨出部１１ｂが形成された側の端部から固定スリーブ７１の内孔７１ａを通過させて管本体１１ａに固定スリーブ７１を装着する。このとき、固定スリーブ７１の内孔７１ａの直径は管本体１１ａの接続用膨出部１１ｂの外径より大きく設定されている。そのため、内孔７１ａの直径より接続用膨出部１１ｂの外径が小さくなり、接続用膨出部１１ｂと内孔７１ａの周縁部とが係止することなく固定スリーブ７１が管本体１１ａに装着される。
【０１０８】
次いで、係合スリーブ７２を一対の分割体に分割した状態で接続用膨出部１１ｂの外周側に配置する。そして、接続用膨出部１１ｂが係合段部７２ｂに係合するように一対の分割体を組付けて係合スリーブ７２を形成するとともに、管本体１１ａに係合スリーブ７２を取付ける。次に、係合スリーブ７２が取り付けられた管本体１１ａの端部を継手本体１４の接続筒部１４ａ内へ挿入する。
【０１０９】
そして、前記固定スリーブ７１の雌ネジ７１ｂを継手本体１４の雄ネジ１５に螺合する。すると、固定スリーブ７１が継手本体１４に螺進されるに連れて係合スリーブ７２の外周面に内孔７１ａの内周面が徐々に圧接していき係合スリーブ７２が縮径される。それと同時に、係合スリーブ７２が接続筒部１４ａ内奥方へ押圧され、その係合スリーブ７２の係合段部７２ｂが係合している管本体１１ａも接続筒部１４ａ内奥方へ押圧される。
【０１１０】
その結果、管本体１１ａの右端面が第２当接面１８に当接されるとともに、係合スリーブ７２の右端面が継手本体１４の端面に当接される。また、継手本体１４に取り付けられた固定スリーブ７１の内側に係合スリーブ７２が保持されて固定スリーブ７１からの抜脱が防止される。そして、継手本体１４、係合スリーブ７２及び固定スリーブ７１が組付けられて継手１２が形成される。それと同時に、係合スリーブ７２の係合段部７２ｂが接続用膨出部１１ｂに係合することにより管本体１１ａが接続筒部１４ａに抜け止めされた状態で接続され、端部構造１０を備えた通水管１１と継手１２とが接続される。
【０１１１】
従って、固定スリーブ７１の内孔７１ａが接続用膨出部１１ｂの外径より大きく形成されているため、通水管１１を継手７０に接続する際に接続用膨出部１１ｂが接続作業の妨げとなることを防止することができ、通水管１１と継手７０との接続作業を容易に行うことができる。その結果、通水管１１と継手７０との施工現場で、通水管１１にシール構造を形成する場合と比較して、端部構造１０を容易に形成することができるとともに、作業者の負担を軽減することができる。
【０１１２】
・ 図２１に示すように、インナー体とアウター体とが一体形成された端部形成部材８０を使用して通水管１１に端部構造１０を形成し、さらに、端部構造１０を備えた通水管１１と接続体とを接続してもよい。なお、通水管１１及び端部形成部材８０の上下左右は図２１における上下左右に対応する。金属材料製の前記端部形成部材８０は略円筒状をなし、端部形成部材８０の左側には、円環状をなすインナー体としてのインナー部８０ａと、同インナー部８０ａの外側に位置する円環状をなすアウター体としてのアウター部８０ｂとが形成されている。
【０１１３】
そして、端部形成部材８０の左側には前記インナー部８０ａとアウター部８０ｂとの間に、円環状をなす環状溝８０ｃが形成され、その環状溝８０ｃに、管本体１１ａの端部が挿入可能に形成されている。即ち、インナー部８０ａの内径は管本体１１ａの内径より小さく形成され、環状溝８０ｃ内に管本体１１ａが挿入されたとき、インナー部８０ａは管本体１１ａの内側に挿入され、アウター部８０ｂは管本体１１ａの外側に配置されるように形成されている。前記環状溝８０ｃの内周面と、同環状溝８０ｃ内に挿入された管本体１１ａの外周面との間に嵌入される合成樹脂製の介装部材８４は略円筒状をなす筒状体が軸線方向に沿って切り欠かれて断面Ｃ字状に形成されている。
【０１１４】
端部形成部材８０の右側には、インナー部８０ａ及びアウター部８０ｂから延びる延出部８０ｄが固定部として形成されている。延出部８０ｄの外周面には、２箇所にシール部材１７が装着され、延出部８０ｄの内径は管本体１１ａの内径とほぼ同じに形成されている。端部形成部材８０と接続される接続体としての継手８２は、図２２に示すように、合成樹脂材料又は金属材料により略円筒状に形成され、その左側に接続筒部８２ａが形成されている。
【０１１５】
さて、前記端部形成部材８０を使用して管本体１１ａにシール構造を形成するには、まず、管本体１１ａに介装部材８４を装着し、次に、図２１に示すように、端部形成部材８０のインナー部８０ａを拡径するための拡径部材８１を管本体１１ａ内に挿入する。なお、前記拡径部材８１は左端部に直径が管本体１１ａの内径とほぼ同じに形成された膨出部８１ａを備え、その膨出部８１ａから直線上に延びる把持部８１ｂを備えている。
【０１１６】
そして、管本体１１ａの端部が端部形成部材８０の環状溝８０ｃ内に挿入され、インナー部８０ａが管本体１１ａの内側に挿入されるとともに、アウター部８０ｂが管本体１１ａの外側に配置されるように端部形成部材８０を管本体１１ａに装着する。さらに、環状溝８０ｃの内周面と管本体１１ａの外周面との間に介装部材８４を嵌入し、続いて、前記把持部８１ｂを把持して拡径部材８１を管本体１１ａから離れる方向へ引っ張り、膨出部８１ａをインナー部８０ａ内を通過させる。
【０１１７】
すると、管本体１１ａの内径とほぼ同じ直径を有する膨出部８１ａによりインナー部８０ａ、管本体１１ａ、介装部材８４及びアウター部８０ｂが拡径されるとともに、インナー部８０ａの内周面及び介装部材８４の内周面が管本体１１ａの内外両周面に圧接してシール構造が形成される。その結果、管本体１１ａの端部にシール構造が形成され、端部構造１０を備えた通水管１１が形成される。インナー部８０ａの管本体１１ａ内への挿入状態において、延出部８０ｄは管本体１１ａの端面から延出している。
【０１１８】
端部構造１０が形成された通水管１１を継手８２に接続するには、図２２に示すように、延出部８０ｄを継手８２の接続筒部８２ａ内へ嵌入する。すると、一対のシール部材１７が接続筒部８２ａの内周面に圧接し、さらに、シール部材１７自身の弾性力により接続筒部８２ａの内周面を外方へ押圧する。そのため、端部形成部材８０が延出部８０ｄにより接続筒部８２ａに接続され、継手８２と通水管１１とが接続される。
【０１１９】
従って、端部形成部材８０を使用することにより、管本体１１ａにシール構造を形成することができるとともに、継手８２に対して通水管１１を容易に接続することができる。なお、通水管１１に端部形成部材８０が接続されてシール構造が形成され、端部構造１０を備えた通水管１１を施工現場に搬入して、継手８２と通水管１１とを接続してもよい。
【０１２０】
また、前記介装部材８４は省略してもよく、その場合には、環状溝８０ｃ内に管本体１１ａのみが嵌入されるように環状溝８０ｃの大きさが調整される。さらに、介装部材８４の代わりに管本体１１ａの外周面と環状溝８０ｃの内周面との間にコイルスプリングやバネ部材等の弾性部材を介装してもよい。このように構成した場合、弾性部材が管本体１１ａの外周面と環状溝８０ｃの内周面との両面をそれぞれ押圧して環状溝８０ｃからの通水管１１の抜け出しを規制することができる。
【０１２１】
・ 図２３に示すインナー体としてのスリーブ８６を管本体１１ａに取り付けて通水管１１にシール構造を形成してもよい。前記スリーブ８６は、金属材料により形成され、円筒状をなすインナー部８６ａと、そのインナー部８６ａの右端に外方へ突出するように形成された係合鍔部８６ｂとより形成されている。インナー部８６ａの外径は管本体１１ａの内径よりわずかに小さく形成されて管本体１１ａ内に嵌入可能に形成されている。係合鍔部８６ｂにおける外径は管本体１１ａの内径より大きく形成され、管本体１１ａ内にインナー部８６ａが嵌入されたとき、管本体１１ａの端面が係合鍔部８６ｂに係合するように形成されている。インナー部８６ａの先端の内周縁には、内方へ突出する内周突条８６ｃが一体形成されている。
【０１２２】
スリーブ８６を拡径するために、スリーブ８６の先端側の内側には前記引抜体６２及び引抜ピン６３が挿入され、スリーブ８６の基端側には略皿状をなすキャップ部材８５が内嵌されている。そして、このキャップ部材８５の中央には前記引抜ピン６３の軸部が貫通している。なお、キャップ部材８５がスリーブ８６に内嵌された状態において、前記内周突条８６ｃとキャップ部材８５との間の長さより引抜体６２の軸線方向への長さが短くなっている。そして、このキャップ部材８５により、引抜体６２とスリーブ８６とを安定した状態に組み付けることができ、さらに、引抜ピン６３の軸部をキャップ部材８５の開口の中心部に支持することができる。なお、キャップ部材８５は省略してもよい。
【０１２３】
そして、管本体１１ａの一端部にインナー部８６ａを内嵌するとともに、係合鍔部８６ｂを管本体１１ａの端面に係合させる。さらに、前記引抜体６２を使用して、内周突条８６ｃ及びインナー部８６ａを拡径させる。すると、図２４に示すように、管本体１１ａの内周面に内周突条８６ｃの外周面が圧接し、管本体１１ａの内周面にシール構造が形成され、端部構造１０を備えた通水管１１が形成される。また、内周突条８６ｃが拡径された部分に接続用膨出部１１ｂが形成される。なお、管本体１１ａの両端部にスリーブ８６を取付け、管本体１１ａの両端部にシール構造及び接続用膨出部１１ｂを形成してもよい。
【０１２４】
上記端部構造１０を備えた通水管１１は、図２４に示す接続体としての継手８７に抜け止めした状態に接続される。前記継手８７は通水管１１同士を接続するため又は分岐継手（ヘッダー）の一部として使用され、略筒状に形成された継手本体８８、固定スリーブ８９、割リング９０及びリング部材９１より主に形成されている。
【０１２５】
合成樹脂材料により略円筒状に形成された前記継手本体８８の両端（図２４では左端のみ図示）には、それぞれ接続筒部９２が形成されている。各接続筒部９２の奥方の内周面には第１載置面９３が形成され、その第１載置面９３より継手本体８８の左側に位置する接続筒部９２の内周面には、前記第１載置面９３より内径及び外径の大きい第２載置面９４が形成されている。前記第１載置面９３及び第２載置面９４には、それぞれゴム材料製のＯ−リング９５が配設されている。
【０１２６】
前記第２載置面９４より継手本体８８の左側に位置する接続筒部９２の内周面には、前記第２載置面９４より内径及び外径の大きい当接面９６が形成されている。また、接続筒部９２の外周面には雄ネジ９７が螺刻されている。前記固定スリーブ８９は接続手段を形成する取着体として設けられている。そして、固定スリーブ８９は、合成樹脂材料により略円筒状に形成され、固定スリーブ８９の右側内周面には、前記雄ネジ９７に螺合可能な雌ネジ８９ａが螺刻されている。また、固定スリーブ８９の内周面には内方へ突出する係止面８９ｂが形成されている。加えて、前記係止面８９ｂの内周縁に繋がる固定スリーブ８９の内周面には、係止面８９ｂ側から、固定スリーブ８９の左端に向かうに連れて縮径するテーパ面８９ｃが形成されている。さらに、固定スリーブ８９の左端の内周縁には、係止リブ８９ｄが内方へ向かって突設されている。
【０１２７】
前記割リング９０は接続手段を形成する係合体として設けられる。この割リング９０は合成樹脂材料製の筒状体が軸線方向に沿って切り欠かれて断面Ｃ字状に形成されている。この割リング９０は右端から左端に向かうに連れて外径が縮径するテーパ状に形成されている。また、割リング９０は接続筒部９２内に挿入された状態において、右端面が係合部として接続用膨出部１１ｂに係合するように形成されている。前記リング部材９１は合成樹脂材料により円環状に形成され、継手本体８８に固定スリーブ８９が螺合された状態で、右端が前記当接面９６に当接し、左端が前記係止面８９ｂに係止されて当接面９６と係止面８９ｂとの間に保持されるようになっている。
【０１２８】
リング部材９１が、当接面９６と係止面８９ｂとの間に保持された状態では、同リング部材９１の内周縁部と、前記第２載置面９４との間にＯ−リング９５が保持されるようになっている。そして、Ｏ−リング９５を第１及び第２載置面９３，９４に載置し、当接面９６にリング部材９１を載置した状態で、割リング９０が内部に収容された固定スリーブ８９を継手本体８８に螺着すると、継手８７が組み付けられる。このとき、割リング９０の左端面は固定スリーブ８９の係止リブ８９ｄに係止され、固定スリーブ８９内からの割リング９０の抜け出しが防止されている。
【０１２９】
さて、接続用膨出部１１ｂが形成された通水管１１と、上記継手８７とを接続するには、まず、固定スリーブ８９を継手本体８８から若干螺退させ、テーパ面８９ｃと割リング９０の外周面との間に間隙を形成し、割リング９０を拡径可能な状態としておく。そして、管本体１１ａの接続用膨出部１１ｂ側を固定スリーブ８９内を通過させて接続筒部９２内に挿入する。すると、係合鍔部８６ｂの外周面が割リング９０の内周面に当接し、さらに、割リング９０内に管本体１１ａが挿入されてその割リング９０が拡径されるとともに、接続用膨出部１１ｂの割リング９０内の通過が許容される。
【０１３０】
そして、係合鍔部８６ｂの端面が第１載置面９３に載置されたＯ−リング９５に当接するまで、通水管１１を継手８７内に挿入する。このとき、接続用膨出部１１ｂは割リング９０の右端面より継手本体８８内奥側に位置し、リング部材９１と対応する位置に配設されている。続いて、固定スリーブ８９を接続筒部９２に螺進させると、テーパ面８９ｃが割リング９０の外周面に圧接していき、割リング９０が徐々に縮径されていく。固定スリーブ８９が接続筒部９２に螺合されると、割リング９０の内面が管本体１１ａの外周面に圧接するとともに、割リング９０の右端面が接続用膨出部１１ｂに係合可能な位置に配置される。また、第１載置面９３に載置されたＯ−リング９５が係合鍔部８６ｂに圧接し、第２載置面９４に載置されたＯ−リング９５が管本体１１ａの外周面に圧接する。
【０１３１】
その結果、接続用膨出部１１ｂが、割リング９０に係合し、その割リング９０が固定スリーブ８９内から抜け出し不能に収容される。そのため、接続用膨出部１１ｂが割リング９０に係合した状態が維持され、管本体１１ａが接続筒部９２に抜け止めされ、通水管１１の継手８７からの抜け出しを防止することができる。
【０１３２】
また、内周突条８６ｃ及びインナー部８６ａの外周面が管本体１１ａの内周面に圧接してシール構造が形成され、そのシール構造により、管本体１１ａの内周面とスリーブ８６の外周面との間を止水することができる。加えて、一対のＯ−リング９５により管本体１１ａの外面と接続筒部９２の内周面との間を止水することができる。万一、管本体１１ａの内周面とスリーブ８６の外周面との間から水が漏れ出たとしても、第２載置面９４に載置されたＯ−リング９５により、管本体１１ａの外面と接続筒部９２の内周面との間を止水することができる。従って、継手８７から水が漏れ出る不具合の発生を防止することができる。
【０１３３】
さらに、管本体１１ａの端面には係合鍔部８６ｂが設けられているため、第１載置面９３に載置されたＯ−リング９５に対して係合鍔部８６ｂの端面の周方向全体が圧接し、係合鍔部８６ｂとＯ−リング９５との間を確実に止水することができる。従って、係合鍔部８６ｂが設けられず、管本体１１ａの端面が斜めに切断されている場合のように、Ｏ−リング９５と管本体１１ａの端面との間から水が漏れ出てしまうといった虞を無くすことができる。
【０１３４】
従って、継手８７から水が漏れ出る不具合の発生を防止することができる。その結果、管本体１１ａの端部を接続筒部９２内に挿入することにより、通水管１１と継手８７とをシール構造を備えた状態で接続することができ、シール構造を形成すべく接続筒部に管本体１１ａを外嵌していた従来と異なり、管本体１１ａに作用する負荷を抑えることができる。
【０１３５】
なお、上記では、継手本体８８、固定スリーブ８９、割リング９０及びリング部材９１を組み付けた状態で、通水管１１の接続作業を行ったが、以下のような接続作業としてもよい。即ち、接続用膨出部１１ｂが形成された通水管１１に固定スリーブ８９及び割リング９０を予め装着した状態で、リング部材９１が当接面９６に当接するように収容された接続筒部９２内に、通水管１１を挿入する。そして、固定スリーブ８９を接続筒部９２に螺合して継手８７を形成し、通水管１１を継手８７に接続してもよい。なお。前記継手８７は、継手本体８８及び固定スリーブ８９を金属材料により形成し、リング部材９１を継手本体８８に一体形成してもよい。なお、割リング９０は合成樹脂材料により成形する。
【０１３６】
・ 各実施形態では、通水管１１を合成樹脂材料のみによって形成したが、合成樹脂材料製の通水管１１として、管本体１１ａの厚み内に金属層を設けてもよい。このように構成した場合、金属層により酸素が通水管１１を通過するのを防止することができる。そのため、通水管１１内を流通する水等の流体に酸素が含有され、その酸素により金属製の接続体が錆びてしまうといった不具合の発生を防止することができる。
【０１３７】
・ 拡径治具２１において、メインスリーブ２２の内周形状を断面八角形状又は断面六角形状に形成し、可動ボルト２４の頭部を断面八角形状又は断面六角形状に形成してもよい。このように構成した場合、ナット２６を雄ネジ２４ｃに螺進又は螺退させたとき、可動ボルト２４の頭部とメインスリーブ２２の内周面とが干渉して、可動ボルト２４をメインスリーブ２２内で回転させることなく移動させることができる。従って、可動ボルト２４の回転を規制するための係合溝２４ｂと、係合ピン２７とを省略することができる。
【０１３８】
・ 各実施形態では、通水管１１と接続体とを接続する施工現場で、通水管１１に端部構造１０を形成したが、工場等で通水管１１に端部構造１０を予め形成しておいてもよい。そして、端部構造１０を備えた通水管１１を施工現場に搬入して、通水管１１と接続体との接続を行ってもよい。このとき、通水管１１の外面を保護するさや管等内に通水管１１を挿入した後、通水管１１と接続体とを即座に接続することができる。また、管本体の端部に固定リングを外嵌するために、管本体に固定リングを装着し、その固定リング及び通水管をさや管内を通過させた後に、通水管と接続体とを接続する必要があった従来と異なり、通水管１１と接続体との接続作業を容易に行うことができる。
【０１３９】
・ 端部構造１０を備えた通水管１１を接続体としての分岐継手、水栓器具等に接続してもよい。
・ 各実施形態で使用された拡径治具２１、拡径部材８１及び拡径工具６０の他の工具を使用してインナー体を拡径してもよい。
【０１４１】
【発明の効果】
以上、詳述したように、請求項１に記載の発明によれば、管本体の拡径作業時に端部に作用する負荷を最小限に抑えて管本体の端部の変形等を防止することができ、管本体と接続体との接続状態において、管本体の端部における流体の漏れ出しを防止することができる。
【０１４２】
加えて、管本体の端部の内周面及び外周面における流体の漏れ出しを効果的に防止することができる。
【０１４３】
請求項２に記載の発明によれば、請求項１に記載の発明の効果に加え、管本体の内周面及び外周面にシール構造を容易に形成することができる。
請求項３に記載の発明によれば、請求項１又は請求項２に記載の発明の効果に加え、管本体の内周面及び外周面にシール構造を容易に形成することができる。
【０１４４】
請求項４に記載の発明によれば、請求項１に記載の発明の効果に加え、アウター体の内周面と管本体の外周面との間における流体の漏れ出しを効果的に防止することができる。
【０１４５】
請求項５に記載の発明によれば、請求項１〜請求項４のいずれか一項に記載の発明の効果に加え、シール構造を備えた管本体を接続体に抜け止めした状態に容易に接続することができる。
【０１４６】
請求項６に記載の発明によれば、管本体の拡径作業時に端部に作用する負荷を最小限に抑えて管本体の端部の変形等を防止することができ、管本体と接続体との接続状態において、管本体の端部における流体の漏れ出しを防止することができる。加えて、管本体と接続体との接続を容易に行うことができる。
請求項７に記載の発明によれば、管本体の拡径作業時に端部に作用する負荷を最小限に抑えて管本体の端部の変形等を防止することができ、管本体と接続体との接続状態において、管本体の端部における流体の漏れ出しを防止することができる。
【０１４７】
請求項８〜請求項１４のいずれか一項に記載の発明によれば、管本体の拡径作業時に端部に作用する負荷を最小限に抑えて管本体の端部の変形等を防止することができ、管本体と接続体との接続状態において、管本体の端部における流体の漏れ出しを防止することができる通水管と接続体との接続構造を提供することができる。
【０１４８】
請求項１５に記載の発明によれば、管本体の拡径作業時に端部に作用する負荷を最小限に抑えて管本体の端部の変形等を防止することができ、管本体と接続体との接続状態において、管本体の端部における流体の漏れ出しを防止することができる端部構造の形成方法を提供することができる。加えて、管本体の端部における流体の漏れ出しを防止するシール構造を容易に形成することができる。
【図面の簡単な説明】
【図１】第１の実施形態の通水管の端部構造を示す部分側断面図。
【図２】第１の実施形態の通水管と継手との接続構造を示す部分側断面図。
【図３】第１の実施形態の通水管と継手とを示す分解斜視図。
【図４】拡径治具を示す斜視図。
【図５】拡径治具により筒体を拡径する前の状態を示す側断面図。
【図６】拡径治具により管本体及び筒体を拡径した状態を示す側断面図。
【図７】第２の実施形態の通水管の端部構造を示す部分側断面図。
【図８】第２の実施形態の通水管と継手との接続構造を示す部分側断面図。
【図９】（ａ）は第２の実施形態の通水管と継手とを示す分解斜視図、（ｂ）は抜脱防止スリーブを分割体に分解した状態を示す正面図。
【図１０】管本体にインナースリーブ及びアウタースリーブを装着した状態を示す部分側断面図。
【図１１】拡径治具により管本体を拡径した状態を示す側断面図。
【図１２】第３の実施形態の通水管と継手との接続構造の部分側断面図。
【図１３】（ａ）は第３の実施形態の通水管と継手とを示す分解斜視図、（ｂ）は係合スリーブを分割体に分解した状態を示す正面図。
【図１４】別例の継手と通水管との接続構造を示す部分側断面図。
【図１５】別例の継手と通水管とを示す分解斜視図。
【図１６】別例の継手と通水管との接続構造を示す部分側断面図。
【図１７】別例の通水管同士の接続構造を示す部分側断面図。
【図１８】別例の拡径工具を示す側断面図。
【図１９】拡径工具を使用して管本体を拡径した状態を示す側断面図。
【図２０】別例の継手と通水管との接続構造を示す部分側断面図。
【図２１】端部形成部材を示す側断面図。
【図２２】端部形成部材を使用した通水管と継手との接続構造を示す側断面図。
【図２３】別例のインナー体を示す部分側断面図。
【図２４】別例の継手と通水管との接続構造を示す部分側断面図。
【図２５】従来の通水管と継手との接続構造を示す部分側断面図。
【符号の説明】
１０…端部構造、１１…通水管、１１ａ…管本体、１１ｂ…接続用膨出部、１２，３０，３６，４６，５０，７０，８２，８７…接続体としての継手、１３…インナー体としての筒体、１４ａ，３４ａ，３９ａ，４７ａ，５１ａ，８２ａ，９２…接続筒部、２０，３５…接続手段を形成する抜脱防止スリーブ、３１…インナー体としてのインナースリーブ、３２…アウター体としてのアウタースリーブ、３５ａ，４０ａ…分割体、３５ｂ，７２ｂ…係合部としての係合段部、３７…インナー体としてのインナーリング、３８…アウター体としてのアウターリング、４０，７２…係合体としての係合スリーブ、４０ｂ…係合部としての係合面、４１，７１，８９…取着体としての固定スリーブ、４８…ピン体としての取付ピン、４９…係合体としての取付筒体、５２…接続手段としての取付スリーブ、５２ａ…係合部としての係止段部、５３…インナー体としての接続筒体、５３ａ，８０ｄ…固定部としての延出部、５４…インナー体としての接続部材、５４ｂ…固定部としての接続鍔部、８０ａ…インナー体としてのインナー部、８０ｂ…アウター体としてのアウター部、８６…インナー体としてのスリーブ、９０…係合体としての割リング。[0001]
BACKGROUND OF THE INVENTION
The present invention, for example, prevents a fluid from leaking out at an end portion of a pipe body of a water pipe connected to a joint, and prevents a fluid from leaking between the pipe body and the joint. The present invention relates to an end structure, a water pipe provided with the end structure, a connection structure between the water pipe and a connection body, and a method of forming the end structure of the water pipe.
[0002]
[Prior art]
Conventionally, for example, a connecting body such as a joint and a water pipe made of a synthetic resin material used as a water supply pipe are connected so as to prevent leakage of fluid from the connecting portion of both (for example, (See Patent Document 1). As shown in FIG. 25, the water flow pipe 101 includes a pipe main body 101a, and the joint 102 to which the pipe main body 101a is connected is formed in a substantially cylindrical shape by a metal material. A connecting tube portion 103 as an inner body inserted into the inside of the water flow pipe 101 is projected from one end portion of the joint 102, and a tubular body (not shown) is formed to be connectable to the other end portion. . On the outer peripheral surface of the connecting tube portion 103, ridges 103a projecting outward along the circumferential direction of the connecting tube portion 103 are formed at a plurality of positions at a predetermined interval.
[0003]
In order to connect the water pipe 101 to the joint 102, first, in the connected state of the water pipe 101 and the joint 102, the inner diameter of the pipe main body 101 a and the inner diameter of the connection cylinder portion 103 are made substantially the same. In order to reduce the flow loss of the fluid, the diameter of the end portion of the tube main body 101a is increased using a diameter expansion jig (not shown). Then, the diameter-enlarged portion of the tube main body 101 a is attached to the outer peripheral surface of the connection cylinder portion 103 before the end portion of the tube main body 101 a whose diameter has been increased is restored to its original state by its own contractive force. Then, the diameter of the tube main body 101 a is reduced by the contraction, and the inner peripheral surface of the tube main body 101 a is in pressure contact with the outer peripheral surface of the connection tube portion 103. Further, a fixing ring 104 formed in a ring shape with a synthetic resin material is fitted on the end of the expanded pipe body 101a.
[0004]
Then, the end portion of the tube main body 101 a is tightened from the outer peripheral side due to the reduced diameter accompanying the contraction of the fixing ring 104, and the end portion of the tube main body 101 a is sandwiched between the fixing ring 104 and the connecting tube portion 103. As a result, the protrusion 103a bites into the inner peripheral surface of the pipe main body 101a, the pipe main body 101a is prevented from being detached by the connection cylinder portion 103, and the water flow pipe 101 is connected to the joint 102 in a state of being prevented from being detached.
[0005]
In the connected state of the water flow pipe 101 and the joint 102, the inner peripheral surface of the pipe main body 101a is connected to the connecting tube 103 by tightening the pipe main body 101a with a reduced diameter and tightening the fixing ring 104 to the end of the pipe main body 101a. A seal structure against the fluid is formed in pressure contact with the outer peripheral surface of the fluid. The seal structure prevents the fluid from leaking out at the end of the tube main body 101a, and prevents the fluid from leaking out between the water conduit 101 and the joint 102.
[0006]
[Patent Document 1]
JP 2000-2384 A
[0007]
[Problems to be solved by the invention]
However, in the conventional connection structure between the water flow pipe 101 and the joint 102, in order to attach the end of the pipe body 101 a to the outer periphery of the connection cylinder 103, the inner diameter of the end is larger than the outer diameter of the connection cylinder 103. The diameter must be increased to be larger. That is, the inner peripheral surface of the end portion of the tube main body 101a must be expanded so that the inner diameter of the end portion becomes larger than the state where the inner peripheral surface of the tube main body 101a is in pressure contact with the outer peripheral surface of the connecting tube portion 103. An excessively large load acts on the part. Therefore, the end of the pipe main body 101a is damaged or deformed by the load, and there is a possibility that fluid leaks from the end of the pipe main body 101a when the water flow pipe 101 and the joint 102 are connected. There was a problem that there was.
[0008]
In order to externally fit the fixing ring 104 to the end of the expanded pipe body 101a, the fixing ring 104 is forcibly slid to the expanded end of the pipe body 101a using a tool. There must be. For this reason, the fixing ring 104 must be slid separately from the work of expanding the diameter of the pipe body 101a, and the work of forming the seal structure at the end of the pipe body 101a is very complicated.
[0009]
The present invention has been made paying attention to the problems existing in the above-described prior art. The purpose is to minimize the load acting on the end during diameter expansion work of the pipe body and prevent deformation of the end of the pipe body, and the connection state between the pipe body and the connection body. The purpose of the present invention is to provide a water pipe end structure and a water pipe having the same end structure that can prevent fluid from leaking out at the end of the pipe body. The other purpose is to minimize the load acting on the end during diameter expansion work of the pipe body and to prevent deformation of the end of the pipe body. An object of the present invention is to provide a connection structure between a water pipe and a connection body that can prevent fluid from leaking out at the end of the pipe body. Another object is to minimize the load acting on the end during diameter expansion work of the pipe main body and to prevent deformation of the end of the pipe main body. It is an object of the present invention to provide a method for forming an end structure that can prevent fluid from leaking out at the end of a tube body in the connected state. In addition, an object of the present invention is to provide a method for forming a connection end portion of a water pipe that can easily form a seal structure that prevents leakage of fluid at the end portion of the pipe body.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention described in claim 1 is a water pipe end structure for preventing fluid leakage at the end of a synthetic resin material pipe body connected to a connection body. An inner body made of an annular metal material is inserted inside the end of the tube body, An outer body is attached to the outside of the end of the tube body, The inner body is expanded from the inside, and between the outer peripheral surface of the inner body and the inner peripheral surface of the pipe body And between the inner peripheral surface of the outer body and the outer peripheral surface of the pipe body The gist of the present invention is that a seal structure for preventing leakage of fluid flowing in the pipe body is formed.
[0012]
Claim 2 The invention described in claim 1 The end portion structure of the water pipe according to claim 1, wherein the inner body and the outer body are integrally formed.
Claim 3 The invention described in claim 1 Or claims 2 In the end structure of the water pipe described in the paragraph, the outer body is enlarged in diameter together with the enlarged diameter of the inner body.
[0013]
Claim 4 The invention described in claim 1 In the end structure of the water pipe according to claim 1, the outer body is formed of a synthetic resin material, and the outer body is pressed against the outer peripheral surface of the pipe body by contraction from the expanded diameter state of the expanded outer body. Is the gist.
[0014]
Claim 5 The invention described in claim 1 to claim 1 4 In the end structure of the water pipe according to any one of the above, a bulging portion for connection for connecting the pipe body to the connection body is formed at the end of the pipe body due to the diameter expansion of the inner body. It is a summary.
[0015]
Claim 6 The invention described in An end structure of a water pipe that prevents leakage of fluid at an end of a tube body made of a synthetic resin material connected to a connection body, and made of an annular metal material inside the end of the tube body The inner body is inserted, and the inner body is expanded from the inside to prevent leakage of fluid flowing in the pipe body between the outer circumferential surface of the inner body and the inner circumferential surface of the pipe body. Formed, The inner body includes an extension portion extending from an end surface of the tube main body in an inserted state in the tube main body, and the extension portion is a fixing portion for connecting the tube main body to the connection body. To do.
[0016]
Claim 7 The invention described in claim 1 to claim 1 6 A gist is that the end structure according to any one of the above is provided at one end or both ends of the pipe body.
Claim 8 The invention described in claim 5 In order to connect the water pipe having the end structure described in 1. to the connection body, the connection structure between the water pipe and the connection body is formed between the end portion of the pipe body and the connection cylinder portion of the connection body. The gist of the present invention is that it is formed by engagement between the connecting bulge portion of the pipe body and the engaging portion of the connecting means provided in the connecting cylinder portion.
[0017]
Claim 9 The invention described in claim 8 In the connection structure between the water pipe having the end structure described in the above and the connection body, the connection means is screwed into the connection cylinder portion and engaged with the connection bulge portion in the attached state. The gist of the present invention is that it is formed by a removal prevention sleeve having a portion.
[0018]
Claim 10 The invention described in claim 8 In the connection structure between the water pipe having the end structure described in the above and the connection body, the connection means maintains the engagement between the engagement body having the engagement portion and the engagement body and the bulging portion for connection. The gist of the present invention is that it is formed by an attachment body attached to the connecting cylinder portion.
[0019]
Claim 11 The invention described in claim 10 In the connection structure between the water pipe having the end structure described in the above and the connection body, the attachment body is formed by a fixing sleeve that holds the engagement body inside and is screwed onto the connection cylinder portion. It is a summary.
[0020]
Claim 12 The invention described in claim 11 In the connection structure between the water pipe having the end structure according to claim 1 and the connection body, the fixing sleeve passes through the outside of the connection bulge portion from the end portion side where the connection bulge portion of the pipe body is formed. The gist is to be attached to the pipe body.
[0021]
Claim 13 The invention described in claim 10 In the connection structure between the water pipe and the connection body having the end structure according to claim 1, the attachment body is a connection cylinder portion for preventing the engagement body inserted into the connection cylinder portion from being detached from the connection cylinder portion. The gist of the present invention is that it is formed by a pin body attached to the surface.
[0022]
Claim 14 The invention described in claim 10 ~ Claim 13 In the connection structure between the water pipe and the connection body having the end structure according to any one of the above, the engagement body is formed by assembling a plurality of divided bodies, and after the formation of the connection bulging portion The gist is that it is formed so as to be engaged with and attached to the bulging portion for connection.
[0023]
Claim 15 According to the invention described in the above, the formation of the end structure of the water pipe that forms the seal structure at the end of the pipe body in order to prevent the fluid from leaking out at the end of the pipe body made of the synthetic resin material connected to the connection body A method, wherein an inner body made of a metal material having a ring shape is inserted inside an end portion of the pipe body, Attach the outer body to the outside of the end of the tube body, The inner body is expanded from the inside to increase the outer peripheral surface of the inner body and the inner peripheral surface of the pipe body. And the inner peripheral surface of the outer body and the outer peripheral surface of the pipe body And press Prevents leakage of fluid flowing through the pipe body The gist is to form a seal structure.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, an embodiment of a water pipe end structure embodying the present invention, a water pipe provided with the same end structure, a connection structure between the water pipe and a connection body, and a method of forming the water pipe end structure Description will be made with reference to FIGS. In the following description of the first embodiment, up, down, left, and right correspond to up, down, left, and right in FIGS. 1 and 2.
[0025]
As shown in FIG. 1, the end structure 10 of the water flow pipe 11 is formed by inserting a cylindrical body 13 as an inner body made of a metal material inside the right end portion of a pipe body 11a made of a synthetic resin material. . That is, the diameter of the cylinder 13 in the pipe body 11a is expanded from the inside, and leakage of fluid flowing in the pipe body 11a is caused between the outer peripheral surface of the cylinder 13 and the inner peripheral surface of the pipe body 11a. A sealing structure for preventing is formed and configured.
[0026]
As shown in FIG. 2, the seal structure prevents leakage of fluid at the end of the pipe body 11 a connected to the joint 12 as a connecting body, and from between the pipe body 11 a and the joint 12. The fluid is prevented from leaking out. As shown in FIG. 3, the cylindrical body 13 is formed in a cylindrical shape from a metal material, and the outer diameter of the cylindrical body 13 before diameter expansion is slightly smaller than the inner diameter of the tube body 11a before diameter expansion. .
[0027]
As shown in FIG. 2, the joint 12 is formed of a joint body 14 made of a synthetic resin material or a metal material and a removal prevention sleeve 20. In the first embodiment, the joint body 14 and the removal prevention sleeve 20 are made of a synthetic resin material. The joint body 14 is formed in a substantially cylindrical shape. A connecting cylinder part 14a for connecting the pipe main body 11a is formed at the left end of the joint main body 14, and the right end is formed to be connectable to a pipe body (not shown). A male screw 15 is threaded on the outer peripheral surface of the connecting tube portion 14a. A first contact surface 16 having an annular shape is formed inside the joint body 14, and a seal member 17 formed in a ring shape with a rubber material is attached to the first contact surface 16. On the inner peripheral surface on the left end side of the joint body 14 with respect to the seal member 17, a second contact surface 18 having an annular shape and having an inner diameter and an outer diameter larger than the first contact surface 16 is formed.
[0028]
As shown in FIG. 3, the removal prevention sleeve 20 as an attachment body that forms a connection means that is screwed onto the connection cylinder portion 14 a is substantially cylindrical, and the left end portion of the removal prevention sleeve 20 is The inner and outer diameters are formed so as to be reduced toward the left end of the removal prevention sleeve 20. An inner hole 20 a having a diameter slightly larger than the outer diameter of the tube main body 11 a is formed at the left end of the removal prevention sleeve 20. Further, as shown in FIG. 2, a female screw 20 b that can be screwed into the male screw 15 is threaded on the inner peripheral surface on the right side of the removal prevention sleeve 20.
[0029]
Next, as shown in FIG. 4, a metal material diameter expansion jig 21 for expanding the diameter of the cylindrical body 13 will be described. Note that the upper, lower, left, and right in the following description of the diameter expanding jig 21 correspond to the upper, lower, left, and right in FIG. As shown in FIGS. 4 and 5, the diameter expansion jig 21 includes a main sleeve 22 formed in a substantially cylindrical shape, and a disk-like sleeve cap 23 is screwed to the left end side of the main sleeve 22. As shown in FIG. 5, a circular hole 23 a is formed in the central portion of the sleeve cap 23. In the main sleeve 22, a bolt-shaped movable bolt 24 is inserted so that the head side of the movable bolt 24 faces the sleeve cap 23 side.
[0030]
A female screw hole 24 a is formed at the center of the end face on the head side of the movable bolt 24 so as to correspond to the circular hole 23 a when inserted into the main sleeve 22. Further, an engaging groove 24b extending along the axis of the movable bolt 24 is formed on the outer surface of the head of the movable bolt 24, and a male screw 24c is formed on the outer peripheral surface of the shaft portion of the movable bolt 24. .
[0031]
Then, with the shaft portion of the movable bolt 24 inserted into the main sleeve 22 protruding from the right end side of the main sleeve 22, a nut 26 is screwed into the male screw 24 c with the spacer 25 interposed therebetween, and the main sleeve A movable bolt 24 is attached to 22. In a state where the movable bolt 24 is attached to the main sleeve 22, the engagement pin 27 is attached from the outer surface of the main sleeve 22 to the engagement groove 24 b of the movable bolt 24, and the engagement pin 27 is engaged. The rotation of the movable bolt 24 within the main sleeve 22 is restricted by the engagement with the groove 24b.
[0032]
A male screw 28 a formed on the right end side of the enlarged shaft 28 is screwed into the female screw hole 24 a of the movable bolt 24 in the main sleeve 22, and the enlarged shaft 28 is attached to the movable bolt 24. The left side of the diameter-expanded shaft 28 is formed such that the diameter gradually increases toward the left side, and the left end portion is formed to have a constant outer diameter. The outer diameter of the left end portion of the diameter-expanded shaft 28 is formed slightly smaller than the inner diameter of the tube main body 11 a and slightly larger than the inner diameter of the cylindrical body 13.
[0033]
Next, a sealing structure and a connecting bulging portion 11b are formed in the water pipe 11 using the diameter expanding jig 21, thereby forming the water pipe 11 having the end structure 10, and the connecting bulging portion. A method of connecting the water conduit 11 and the joint 12 using 11b will be described. First, as shown in FIG. 3, an anti-extraction sleeve 20 is attached to the tube body 11a. Next, the nut 26 is screwed out of the movable bolt 24 in the diameter expanding jig 21 and the movable bolt 24 is moved until the head-side end surface comes into contact with the inner surface of the main sleeve 22 on the sleeve cap 23 side. Next, as shown in FIG. 4, with the cylindrical body 13 mounted on the diameter-expanded shaft 28, the male screw 28a of the diameter-expanded shaft 28 is screwed into the female screw hole 24a as shown in FIG. A diameter shaft 28 is attached to the movable bolt 24.
[0034]
Next, the nut 26 is screwed into the movable bolt 24 in a state where the end of the tube body 11 a is externally fitted to the cylinder 13 and the tube body 11 a is mounted on the diameter-expanded shaft 28. Then, as shown in FIG. 6, since the movable bolt 24 does not rotate due to the engagement between the engagement pin 27 and the engagement groove 24b, the movable bolt 24 is arranged so that the engagement groove 24b extends along the engagement pin 27. It is drawn into the main sleeve 22 along the axis 22.
[0035]
Simultaneously with the movement of the movable bolt 24, the diameter-expanded shaft 28 is drawn into the main sleeve 22. Then, the diameter-expanded portion of the diameter-expanded shaft 28 is gradually inserted into the cylinder 13, and the cylinder 13 is gradually pushed outward from the left side to the right side by the diameter-expanded part, and the diameter is expanded. As the diameter increases, the pipe body 11a is also expanded. At this time, the inner peripheral surface of the cylinder 13 expanded by the left end portion of the expanded shaft 28 having an outer diameter slightly smaller than the inner diameter of the tube main body 11a is substantially the same as the inner diameter of the non-expanded portion of the tube main body 11a. become.
[0036]
By expanding the diameter of the tube body 11a and the cylinder body 13 at the same time, as shown in FIG. 1, the outer peripheral surface of the cylinder body 13 is in pressure contact with the inner peripheral surface of the end of the tube body 11a. A seal structure for preventing fluid leakage is formed between the surface and the inner peripheral surface of the end portion of the tube main body 11a. Further, a bulging portion 11b for connection projecting outward is formed on the outer surface of the end portion of the tube main body 11a by the cylindrical body 13 having an enlarged diameter at the end portion of the tube main body 11a. And the water flow pipe 11 provided with the edge part structure 10 which consists of the said sealing structure and the bulging part 11b for a connection in the edge part of the pipe | tube main body 11a is formed.
[0037]
Now, in order to connect the joint 12 and the water pipe 11, first, as shown in FIG. 2, the end of the pipe body 11a on the side where the bulging part 11b for connection is formed is placed in the connecting cylinder part 14a. The tube body 11 a is brought into contact with the right end surface of the tube body 11 a against the second contact surface 18, and the tube body 11 a and the right end surface of the tube body 13 are brought into contact with the seal member 17. Subsequently, the joint 12 is formed by screwing the female screw 20 b of the removal prevention sleeve 20 into the male screw 15 and attaching the removal prevention sleeve 20 to the joint body 14. At this time, since the diameter of the inner hole 20a of the removal prevention sleeve 20 is formed to be substantially the same as the outer diameter of the non-expanded portion of the tube body 11a, the outer diameter of the connecting bulging portion 11b formed by the expanded diameter is increased. It is smaller than the diameter.
[0038]
For this reason, in the attached state of the anti-separation sleeve 20 with respect to the joint body 14, the connecting bulging portion 11 b engages with the inner peripheral edge on the left side of the anti-separation sleeve 20 as the engaging portion, and the tube is removed from the anti-extraction sleeve 20. The main body 11a is prevented from coming out. As a result, a connection structure between the water pipe 11 and the joint 12 is formed by the connection cylinder portion 14a and the removal prevention sleeve 20. And in order to connect the water flow pipe 11 provided with the edge part structure 10 to the joint 12, the water flow pipe 11 is formed by the connection structure formed between the end part of the pipe main body 11a and the connection cylinder part 14a of the joint 12. The joint 12 is connected in a state where it is prevented from coming off.
[0039]
In the connected state of the water flow pipe 11 and the joint 12, the fluid is prevented from flowing into the joint main body 14 by the seal member 17, and the seal structure allows the inner peripheral surface of the pipe main body 11 a and the outer peripheral surface of the cylindrical body 13 to Leakage of fluid from between is prevented.
[0040]
Therefore, the fluid is prevented from leaking between the pipe main body 11a and the joint main body 14, and the leakage of the fluid from between the water flow pipe 11 and the joint 12 can be prevented. Further, since the inner diameter of the cylindrical body 13 and the inner diameter of the non-expanded portion of the tube main body 11a are formed substantially the same, the flow loss of the fluid flowing through the tube main body 11a by the cylindrical body 13 can be reduced.
[0041]
According to the first embodiment, the following features can be obtained.
(1) In order to prevent leakage of fluid at the end of the tube main body 11a connected to the connection tube portion 14a, the diameter of the tube main body 11a and the tube body 13 is increased at the same time to seal the end of the tube main body 11a. A structure is formed. Therefore, unlike the conventional case where the inner diameter of the pipe body is increased more than necessary in order to form a seal structure that prevents leakage of fluid at the end of the pipe body connected to the connection body, the end of the pipe body 11a is increased. The load acting on the part can be minimized. Therefore, in the connection state of the water flow pipe 11 and the joint 12, the end of the pipe main body 11 a is prevented from being damaged or deformed, and the inner peripheral surface of the pipe main body 11 a and the outer peripheral surface of the cylindrical body 13 are connected. It is possible to prevent leakage of fluid from between the two.
[0042]
(2) Since the diameter of the cylindrical body 13 is increased from the inside, the outer peripheral surface of the cylindrical body 13 is in pressure contact with the inner peripheral surface of the tube main body 11a. Therefore, a seal structure can be formed between the pipe body 11a and the cylinder 13 to prevent fluid leakage, and fluid leakage from between the water pipe 11 and the joint 12 can be prevented. it can.
[0043]
(3) The diameter of the cylindrical body 13 and the diameter of the pipe main body 11 a can be increased to form the end structure 10 in the water flow pipe 11. Accordingly, unlike the conventional case in which the fixing ring is forcibly slid to the end portion of the pipe body whose diameter has been enlarged using a tool after the pipe body has been enlarged, the seal structure can be easily provided to the pipe body 11a. Can be formed.
[0044]
(4) By expanding the diameter of the cylindrical body 13 and the pipe main body 11a at the same time, the connecting bulging part 11b can be formed on the outer surface of the pipe main body 11a, and the connecting bulging part 11b and the removal preventing sleeve 20 can be formed. The water pipe 11 can be connected to the joint 12 by being engaged with the inner peripheral surface of the joint 12. Therefore, in order to connect the pipe body to the connection body, the diameter of the pipe body is expanded, the end of the pipe body is externally fitted to the connection body, and unlike the conventional case where the end of the pipe body is tightened by the fixing ring, The connection between the pipe body 11a and the connection cylinder portion 14a, that is, the connection between the water pipe 11 and the joint 12 can be easily performed.
[0045]
(5) Since the end of the tube main body 11a is expanded so that the inner diameter of the cylindrical body 13 and the inner diameter of the non-expanded portion of the tube main body 11a are substantially the same, the fluid flowing through the tube main body 11a The flow loss due to the cylindrical body 13 can be reduced.
[0046]
(6) Since the cylindrical body 13 is formed of a metal material, it is possible to eliminate the possibility that the cylindrical body 13 is reduced in diameter or deformed after the diameter of the cylindrical body 13 is increased. The sealing function between the surface and the outer peripheral surface of the cylindrical body 13 and the bulging portion 11b for connection can be maintained. Therefore, leakage of fluid from between the inner peripheral surface of the pipe main body 11a and the outer peripheral surface of the cylindrical body 13 can be reliably prevented, and the connection between the water pipe 11 and the joint 12 can be reliably maintained. Can do. Also, since the tubular body 13 having an annular shape is expanded to form the connecting bulge portion 11b, the end of the tube body 11a is different from the conventional case where the diameter of the tube body is expanded using a diameter expansion jig. The diameter of the portion can be expanded to a state close to a perfect circle. Therefore, the bulging portion 11b for connection and the left inner peripheral edge of the removal preventing sleeve 20 can be reliably engaged, and the connection between the water pipe 11 and the joint 12 can be reliably maintained.
[0047]
(7) The connection bulging portion 11b is engaged with the inner peripheral edge on the left side of the removal prevention sleeve 20 screwed into the joint body 14 to prevent the pipe body 11a from coming out of the removal prevention sleeve 20. That is, the water pipe 11 can be easily connected in a state in which the water pipe 11 is prevented from being detached from the joint 12.
[0048]
(8) It is possible to prevent the occurrence of problems that occur when using the tool for expanding the diameter of the pipe body 11a as described below. The diameter expansion tool includes an assembly of four divided bodies, and the assembly is inserted into the pipe body 11a to perform a diameter expansion operation. That is, when the rod is inserted into the center of the assembly in the state of insertion of the assembly, the four divided bodies are pushed outward, and the entire assembly is pushed and spread, so that the end of the tube body 11a is The diameter is directly expanded by each divided body. Therefore, although the inner peripheral surface of the pipe body 11a corresponding to each divided body is pushed outward, the position corresponding to the gap between the divided bodies is not expanded. As a result, the diameter-expanded portion and the non-diameter-expanded portion are formed at the end of the pipe main body 11a after the diameter expansion, and the pipe main body 11a is not uniformly expanded in the circumferential direction. When connected, the entire sealing member 17 does not come into close contact with the entire end surface of the tube main body 11a, and a problem of fluid leakage from between the water conduit 11 and the joint 12 occurs. On the other hand, in the present embodiment, the cylindrical body 13 is uniformly expanded in the entire circumferential direction by the expanded diameter shaft 28, so that the end portion of the tube body 11a is uniformly expanded in the entire circumferential direction. Therefore, unlike the case where the above tool is used, the substantially circular pipe body 11a and the end face of the cylindrical body 13 are surely in close contact with the seal member 17, and the fluid leaks from between the water pipe 11 and the joint 12. The occurrence of defects can be prevented. In addition, it is possible to prevent the occurrence of a problem that the inner surface of the tube main body 11a is damaged by the outer surface of the diameter expansion jig or the like, as in the case of directly expanding the diameter of the tube main body 11a using the tool. Further, the cylindrical body 13 protects the inner peripheral surface of the tube main body 11a in which the cylindrical body 13 is fitted. Therefore, there is no possibility that the end of the tube main body 11a is thermally deformed by the cylindrical body 13.
[0049]
(Second Embodiment)
Hereinafter, the second embodiment of the end structure of the water pipe embodying the present invention, the water pipe having the end structure, the connection structure between the water pipe and the connection body, and the method of forming the end structure of the water pipe A form is demonstrated according to FIGS. In addition, since 2nd Embodiment is a structure which only changed the edge part structure and connection body of 1st Embodiment, the detailed description is abbreviate | omitted about the same part. In addition, the top, bottom, left, and right in the following description of the second embodiment correspond to the top, bottom, left, and right in FIGS. 7 and 8.
[0050]
As shown in FIG. 7, the end structure 10 of the water pipe 11 includes an inner sleeve 31 as an inner body provided at the right end of the pipe main body 11a, and an outer body attached to the outside of the right end of the pipe main body 11a. The outer sleeve 32 is formed. And the end structure 10 of the water flow pipe 11 is formed between the outer peripheral surface of the inner sleeve 31 and the inner peripheral surface of the pipe main body 11a and the inner peripheral surface of the outer sleeve 32 and the pipe main body 11a by expanding the inner sleeve 31. A seal structure is formed between the outer peripheral surface of the two.
[0051]
As shown in FIG. 9 (a), the inner sleeve 31 made of a metal material has a cylindrical inner portion 31a and an engagement collar portion formed so as to protrude outward from the right end edge of the inner portion 31a. And 31b. The outer diameter of the inner portion 31a is formed slightly smaller than the inner diameter of the tube main body 11a so as to be fitted into the tube main body 11a. The outer diameter of the engagement flange 31b is formed larger than the inner diameter of the tube body 11a, and the end surface of the tube body 11a is engaged with the engagement flange 31b when the inner portion 31a is inserted into the tube body 11a. Is formed.
[0052]
The outer sleeve 32 is formed in a substantially cylindrical shape by a synthetic resin material such as cross-linked polyethylene, and the length of the outer sleeve 32 along the axial direction is longer than the length of the inner sleeve 31 along the axial direction. In the second embodiment, the outer sleeve 32 is formed of a synthetic resin material, but may be formed of a soft metal material such as copper.
[0053]
As shown in FIG. 8, an inner peripheral flange portion 32 b that protrudes inward along the circumferential direction of the outer sleeve 32 is formed on the inner peripheral edge of the right end of the cylindrical portion 32 a of the outer sleeve 32, and the outer peripheral edge has An outer peripheral flange portion 32 c is formed to protrude outward along the circumferential direction of the outer sleeve 32. The inner diameter of the cylindrical portion 32a before diameter expansion is formed slightly larger than the outer diameter of the tube body 11a before diameter expansion, and the inner diameter of the inner peripheral flange portion 32b before diameter expansion is the same as that of the tube body 11a before diameter expansion. It is formed smaller than the outer diameter.
[0054]
Next, the joint 30 as the connection body of the second embodiment will be described. As shown in FIG. 8 and FIG. 9A, the joint 30 is formed of a joint body 34 and a removal prevention sleeve 35 made of a synthetic resin material or a metal material. In the second embodiment, the joint body 34 and the removal prevention sleeve 35 are formed of a synthetic resin material. The joint body 34 is formed in a cylindrical shape, and connecting tube portions 34a to which the pipe body 11a can be connected are formed on both end sides (only the left end side is shown in FIG. 8). As shown in FIG. 8, female threads 34b are formed on the inner peripheral surface of the connecting tube portion 34a. Further, a contact surface 34c that protrudes inward along the circumferential direction of the joint body 34 is formed at the center of the joint body 34, and both surfaces of the contact surface 34c (only one surface is shown in FIG. 8). A pair of seal members 17 is attached to each pair. Note that only one seal member 17 may be attached to the contact surface 34c.
[0055]
As shown in FIG. 9A, the removal preventing sleeve 35 as the connecting means provided in the connecting cylinder portion 34a is formed in a substantially bolt shape, and as shown in FIG. It is formed by assembling. The divided bodies 35a are integrated with one side edge connected to each other, and the divided bodies 35a are formed so as to be separated or assembled around the connecting portion.
[0056]
Further, on the inner peripheral surface of the removal prevention sleeve 35, when the removal prevention sleeve 35 is mounted on the outer peripheral surface of the pipe main body 11a, the engagement engages with the connecting bulging portion 11b formed on the pipe main body 11a. An engagement step portion 35 b as a portion is formed along the circumferential direction of the removal prevention sleeve 35. Further, as shown in FIG. 8, a male screw 35 c that can be screwed into the female screw 34 b of the joint body 34 is threaded on the outer peripheral surface on the right end side of the removal prevention sleeve 35.
[0057]
Next, the end structure 10 is formed by forming the sealing structure and the connecting bulging portion 11b in the water pipe 11 using the diameter expanding jig 21, and the connecting bulging portion 11b is used to pass through the sealing structure and the connecting bulging portion 11b. A method for connecting the water pipe 11 and the joint 30 will be described. First, as shown in FIG. 10, the inner sleeve 31 is attached to the diameter-expanded shaft 28, and the diameter-expanded shaft 28 is attached to the movable bolt 24. Subsequently, the outer sleeve 32 is attached to the outside of the end portion of the tube main body 11a, and the inner peripheral flange portion 32b is engaged with the end surface of the tube main body 11a.
[0058]
Further, the tube main body 11a is externally fitted to the inner sleeve 31 mounted on the diameter-expanded shaft 28, the inner portion 31a is inserted into the tube main body 11a, and the end surface of the tube main body 11a is engaged with the engaging flange portion 31b. Combine. Subsequently, as shown in FIG. 11, the end portion of the tube main body 11a is adjusted so that the inner diameter of the inner sleeve 31 is equal to the inner diameter of the non-expanded portion of the tube main body 11a using the diameter expansion jig 21. Expand the diameter. Then, the entire inner sleeve 31 is expanded in diameter by the expanded shaft 28, and at the same time, the right side of the tube body 11a and the outer sleeve 32 is expanded.
[0059]
As a result, the outer peripheral surface of the inner sleeve 31 is pressed against the inner peripheral surface of the end portion of the tube body 11a, and fluid leakage is prevented between the outer peripheral surface of the inner sleeve 31 and the inner peripheral surface of the end portion of the tube main body 11a. A sealing structure is formed. Further, the outer peripheral surface of the expanded pipe body 11a is in pressure contact with the inner peripheral surface of the outer sleeve 32. Further, when the outer sleeve 32 is expanded, the diameter of the tube body is reduced due to the contraction of itself from the expanded state. It press-contacts to the outer peripheral surface of 11a.
[0060]
A seal structure that prevents fluid leakage is formed between the inner peripheral surface of the outer sleeve 32 and the outer peripheral surface of the tube body 11a. At the same time, the diameter of the right side of the outer sleeve 32 is increased, so that a connecting bulging portion 11 b that protrudes outward is formed on the outer peripheral surface of the right side of the outer sleeve 32. That is, the end structure 10 of the water pipe 11 having the seal structure and the connecting bulging portion 11b is formed at the right end of the pipe body 11a.
[0061]
Next, as shown in FIG. 8, a pair of split bodies 35a are assembled to the outer surface of the tube body 11a, and the removal prevention sleeve 35 is attached to the tube body 11a. Next, the end of the tube main body 11a on the side where the connecting bulging portion 11b is formed is inserted into the connecting tube portion 34a, and the male screw 35c of the removal prevention sleeve 35 is inserted into the female screw 34b of the joint main body 34. And the joint 30 is formed.
[0062]
The right end surface of the removal prevention sleeve 35 is in contact with the outer peripheral flange portion 32c of the outer sleeve 32, and the outer peripheral flange portion 32c is sandwiched between the removal prevention sleeve 35 and the contact surface 34c so that the outer sleeve 32 is It is positioned and fixed in the joint body 34. At this time, the connecting bulging portion 11 b formed on the outer surface of the outer sleeve 32 engages with the engaging step portion 35 b of the removal preventing sleeve 35. Further, the outer peripheral flange portion 32c functions as the connecting bulging portion 11b, and the right end surface of the removal preventing sleeve 35 is engaged with the outer peripheral flange portion 32c.
[0063]
As a result, the removal prevention sleeve 35 provided with the engaging step portion 35b engaged with the connection bulging portion 11b is attached to the joint main body 34, thereby preventing the pipe main body 11a from coming out of the joint main body 34. . That is, the connection structure between the water pipe 11 and the joint 30 is formed by the above-described removal prevention sleeve 35 and the connection cylinder portion 34 a of the joint body 34. And in order to connect the water flow pipe 11 provided with the edge part structure 10 to the joint 30, the water flow pipe 11 is formed by the connection structure formed between the end part of the pipe main body 11a and the connection cylinder part 34a of the joint 30. The joint 30 is connected in a state where it is prevented from coming off.
[0064]
In the connected state of the water flow pipe 11 and the joint 30, the fluid is prevented from flowing into the joint main body 34 from the pipe main body 11 a by the seal member 17 on the inner peripheral side of the joint main body 34. At the same time, the seal structure between the inner peripheral surface of the tube main body 11a and the inner sleeve 31 prevents fluid from leaking to the contact surface 34c side. Even if the fluid leaks to the contact surface 34c side, the fluid is moved to the left end side of the removal preventing sleeve 35 by the seal structure between the outer peripheral surface of the tube main body 11a and the inner peripheral surface of the outer sleeve 32. Is prevented from leaking out. Further, the seal member 17 on the outer peripheral side of the joint main body 34 prevents fluid from leaking from between the inner peripheral surface of the connection tube portion 34 a and the outer peripheral surface of the outer sleeve 32. Therefore, it is possible to prevent fluid from leaking between the water conduit 11 and the joint 30. Further, the end surface of the tube main body 11a can be protected by the engagement flange portion 31b of the inner sleeve 31 and the inner peripheral flange portion 32b of the outer sleeve 32 even if the end surface of the tube main body 11a is cut obliquely or unevenly. it can. Therefore, there is no possibility of damaging the seal member 17 when the tube main body 11a is inserted into the connecting cylinder portion 34a.
[0065]
Further, since the inner diameter of the inner sleeve 31 and the inner diameter of the non-expanded portion of the tube main body 11a are formed substantially the same, the flow loss of the fluid flowing through the tube main body 11a by the inner sleeve 31 can be reduced. Further, since the inner sleeve 31 and the outer sleeve 32 are simultaneously expanded in diameter, the work of forming the seal structure on the pipe body 11a can be performed quickly and easily, and the connection work between the water flow pipe 11 and the joint 30 can be simplified. You can plan. Further, the diameter of the outer sleeve 32 is increased, so that a bulging portion 11b for connection is formed in the tube main body 11a. Therefore, compared with the case where the work of forming the connecting bulging portion 11b on the pipe body 11a is performed separately from the work of forming the seal structure on the pipe body 11a, the work of forming the seal structure of the pipe body 11a, and further, Connection work between the water pipe 11 and the joint 30 can be performed quickly and easily.
[0066]
(Third embodiment)
Hereinafter, the third embodiment of the end structure of the water pipe embodying the present invention, the water pipe having the end structure, the connection structure between the water pipe and the connection body, and the method of forming the end structure of the water pipe A form is demonstrated according to FIG.12 and FIG.13. In addition, since 3rd Embodiment is a structure which only changed the edge part structure and connection body of 1st Embodiment, the detailed description is abbreviate | omitted about the same part. In addition, the top, bottom, left, and right in the following description of the third embodiment correspond to the top, bottom, left, and right in FIG.
[0067]
As shown in FIG. 12, the end structure 10 of the water conduit 11 includes an inner ring 37 as an inner body provided at the right end of the pipe body 11a, and an outer body attached to the outside of the right end of the pipe body 11a. As an outer ring 38, the outer ring 38 is formed. And the end structure 10 of the water flow pipe 11 is formed between the outer peripheral surface of the inner ring 37 and the inner peripheral surface of the pipe main body 11a and the inner peripheral surface of the outer ring 38 and the pipe main body by expanding the inner ring 37. A seal structure is formed between the outer peripheral surface of 11a.
[0068]
As shown in FIG. 13 (a), the inner ring 37 is formed of a metal material in a cylindrical shape, and the outer diameter of the inner ring 37 before diameter expansion is slightly smaller than the inner diameter of the tube body 11a before diameter expansion. ing. The outer ring 38 is formed in a cylindrical shape from a synthetic resin material, and the inner diameter of the outer ring 38 before diameter expansion is slightly larger than the outer diameter of the pipe body 11a before diameter expansion. Further, the inner ring 37 and the outer ring 38 are formed to have substantially the same length along the axial direction. In the third embodiment, the outer ring 38 is formed of a synthetic resin material, but may be formed of a soft metal material such as copper.
[0069]
As shown in FIGS. 12 and 13A, the joint 36 is formed of a joint body 39 made of a synthetic resin material or a metal material, an engagement sleeve 40, and a fixed sleeve 41. In the third embodiment, the joint body 39, the engagement sleeve 40, and the fixing sleeve 41 are formed of a synthetic resin material. A connecting tube portion 39a for connecting the pipe body 11a is formed at the left end of the joint body 39, and the right end is formed so as to be connectable to a pipe body (not shown). A male screw 39b is threaded on the outer peripheral surface of the connecting tube portion 39a. An annular contact surface 39c is formed inside the joint body 39, and a seal member 17 is formed on the contact surface 39c. It is installed. As shown in FIG. 13 (a), the engagement sleeve 40 as the engagement body forming the connection means provided in the connection cylinder portion 39a is formed in a substantially cylindrical shape, and as shown in FIG. 13 (b), a pair of It is formed by assembling the divided body 40a.
[0070]
The divided bodies 40a are integrated by connecting one side edge of each divided body 40a, and the divided bodies 40a are formed so as to be separated or assembled with the connecting portion as a center. As shown in FIG. 12, the engagement sleeve 40 has an inner diameter and an outer diameter on the right side that are larger than those on the left side, and an engagement surface 40 b as an engagement portion is formed in the engagement sleeve 40.
[0071]
A fixing sleeve 41 as an attachment forming the connecting means provided in the connecting cylinder portion 39a is substantially cylindrical, and has an inner diameter slightly larger than the outer diameter on the left side of the engaging sleeve 40 on the left end side. A hole 41a is formed. Further, a female screw 41 b that can be screwed into the male screw 39 b of the joint body 39 is threaded on the inner peripheral surface on the right side of the fixing sleeve 41.
[0072]
Next, the end structure 10 is formed by forming the sealing structure and the connecting bulging portion 11b in the water pipe 11 using the diameter expanding jig 21, and the connecting bulging portion 11b is used to pass through the sealing structure and the connecting bulging portion 11b. A method for connecting the water pipe 11 and the joint 36 will be described. First, the fixing sleeve 41 is attached to the pipe body 11a. Subsequently, as in the second embodiment, after the inner ring 37 is attached to the diameter-expanded shaft 28, the pipe body 11a to which the outer ring 38 is attached is externally fitted.
[0073]
Subsequently, the inner ring 37, the pipe body 11a, and the outer ring 38 are expanded using the diameter expansion jig 21 so that the inner diameter of the inner ring 37 and the inner diameter of the non-expanded portion of the pipe body 11a are substantially the same. Diameter. Then, as shown in FIG. 12, the inner ring 37 is expanded in diameter so that the outer peripheral surface of the inner ring 37 is in pressure contact with the inner peripheral surface of the end of the tube main body 11a. A seal structure for preventing fluid leakage is formed between the inner peripheral surface of the end portion of 11a.
[0074]
In addition, the outer peripheral surface of the expanded pipe main body 11a is in pressure contact with the inner peripheral surface of the outer ring 38, and the outer ring 38 is in pressure contact with the outer peripheral surface of the pipe main body 11a due to the reduced diameter accompanying its contraction. As a result, a seal structure that prevents fluid leakage is formed between the inner peripheral surface of the outer ring 38 and the outer peripheral surface of the tube main body 11a. In addition, by expanding the diameter of the outer ring 38 as a whole, a bulging portion 11b for connection that protrudes outward from the outer surface of the tube body 11a is formed in the tube body 11a. And the water flow pipe 11 provided with the edge part structure 10 which consists of a seal structure and the bulging part 11b for a connection in the pipe main body 11a is formed.
[0075]
Then, as shown in FIG. 12, a pair of division bodies 40a are assembled to the outer surface of the tube body 11a, and the engagement sleeve 40 is attached to the tube body 11a. Next, the end of the tube main body 11 a on the side where the connection bulging portion 11 b is formed is inserted into the connection cylinder portion 39 a, and the female screw 41 b of the fixing sleeve 41 is screwed onto the male screw 39 b of the joint main body 39. By joining, the joint 36 is formed.
[0076]
Then, the inner peripheral edge of the fixing sleeve 41 engages with the outer peripheral surface of the engagement sleeve 40 and the engagement sleeve 40 is moved inward of the joint main body 39, and the right end surface of the engagement sleeve 40 is moved to the left end surface of the joint main body 39. Abut. The right end surface of the tube main body 11a is in pressure contact with the seal member 17, and the engagement sleeve 40 is sandwiched between the joint main body 39 and the fixed sleeve 41, and the connection bulging portion 11b and the engagement sleeve 40 are also sandwiched. Is engaged with the engagement surface 40b.
[0077]
As a result, the engagement sleeve 40 is held in the fixed sleeve 41, and the engagement between the engagement surface 40b of the engagement sleeve 40 and the connecting bulging portion 11b is maintained. That is, since the connecting bulging portion 11 b engages with the engaging surface 40 b of the engaging sleeve 40 positioned in the joint 36, the water pipe 11 is connected to the joint 36 while being prevented from coming off. And the connection structure of the water flow pipe 11 and the coupling 36 is formed by the engagement sleeve 40, the fixing sleeve 41, and the connection cylinder part 39a. That is, in order to connect the water pipe 11 provided with the end structure 10 to the joint 36, the water pipe 11 is formed by the connection structure formed between the end of the pipe body 11 a and the connection cylinder part 39 a of the joint 36. The joint 36 is connected in a state where it is prevented from coming off.
[0078]
Therefore, in the third embodiment, the fluid is prevented from flowing into the joint main body 39 by the seal member 17 as in the second embodiment. At the same time, the seal structure between the inner peripheral surface of the pipe body 11a and the outer peripheral surface of the inner ring 37 prevents fluid from leaking to the contact surface 39c side. Even if the fluid leaks to the contact surface 39c side and leaks to the inner peripheral surface side of the connecting tube portion 39a, the seal structure between the outer peripheral surface of the pipe body 11a and the inner peripheral surface of the outer ring 38 Thus, the fluid is prevented from leaking to the engagement sleeve 40 side. As a result, leakage of fluid from between the water conduit 11 and the joint 36 can be prevented. Further, the flow loss of the fluid flowing through the pipe body 11a by the inner ring 37 can be reduced.
[0079]
Furthermore, the bulging part 11b for connection can be formed in the pipe main body 11a by the outer ring 38 only by slightly expanding the diameter of the pipe main body 11a. Therefore, the connection work between the pipe main body 11a and the connection cylinder portion 39a, that is, the connection work between the water flow pipe 11 and the joint 36 can be performed quickly and easily. In addition, since the engagement sleeve 40 is formed by assembling the pair of divided bodies 40a, the engagement sleeve 40 can be attached to the water flow pipe 11 after the connection bulging portion 11b is formed in the pipe body 11a. it can. Therefore, it is not necessary to expand the inner ring 37 so that the connecting bulge 11b engages with the engaging surface 40b after the engaging sleeve 40 is attached to the water conduit 11, and the water conduit of the engagement sleeve 40 is not required. 11 and the connection work of the water pipe 11 and the joint 36 can be quickly performed.
[0080]
In addition, you may change each said embodiment as follows.
In the first embodiment, the diameter of the cylinder 13 may be increased so that the inner diameter of the expanded cylinder 13 is smaller or larger than the inner diameter of the non-expanded portion of the tube main body 11a.
[0081]
In the first embodiment, the outer sleeve 32 of the second embodiment or the outer ring 38 of the third embodiment is mounted as an outer body made of a synthetic resin material or a soft metal material on the outside of the tube body 11a. Then, a seal structure may be formed on both the inner and outer peripheral surfaces of the tube main body 11a.
[0082]
-In 2nd Embodiment, it forms so that the length to the axial direction of the inner sleeve 31 and the length to the axial direction of the outer sleeve 32 may become substantially the same. Then, when the inner sleeve 31, the pipe body 11 a and the outer sleeve 32 are expanded in diameter, the entire outer sleeve 32 may be expanded in diameter to form the connection bulging portion 11 b by the end surface of the outer sleeve 32.
[0083]
In the second embodiment, the inner sleeve 31 may be expanded so that the inner diameter of the expanded inner sleeve 31 is smaller or larger than the inner diameter of the non-expanded portion of the pipe body 11a.
[0084]
In the second embodiment, the removal prevention sleeve 35 may be integrally formed without being divided into the divided bodies 35a.
-In 2nd Embodiment, the outer sleeve 32 may be abbreviate | omitted and a seal structure may be formed only in the internal peripheral surface of the pipe main body 11a. At this time, the bulge portion for connection 11b formed on the outer surface of the tube main body 11a and the engagement step portion 35b of the removal prevention sleeve 35 may be engaged by expanding the diameters of the inner sleeve 31 and the tube main body 11a. .
[0085]
In the second embodiment, the inner sleeve 31 and the outer sleeve 32 may be integrated.
-You may use the joint 46 shown in FIG.14 and FIG.15 instead of the joint 30 of 2nd Embodiment. The joint 46 is mainly formed from a joint body 47 made of a synthetic resin material or a metal material, an attachment pin 48 as a pin body that forms an attachment body of connection means, and an attachment cylinder 49 as an engagement body. . In this case, the joint main body 47, the mounting pin 48, and the mounting cylinder 49 were formed of a synthetic resin material. Note that the upper, lower, left, and right in the description of the water pipe 11, the joint body 47, the mounting pin 48, and the mounting cylinder 49 correspond to the upper, lower, left and right in FIG.
[0086]
As shown in FIGS. 14 and 15, the joint body 47 is formed in a substantially cylindrical shape, and a connecting cylinder part 47 a is formed at the left end of the joint body 47, and a pipe body (not shown) can be connected to the right end. Is formed. An accommodation recess 47b is formed in the opposite position on the left end surface of the connecting cylinder 47a. A mounting hole 47c is formed at a position opposite to the left end portion of the connecting tube portion 47a so that the mounting pin 48 can be mounted on the connecting tube portion 47a in a state of crossing the housing recess 47b.
[0087]
A female screw (not shown) is threaded on the inner peripheral surface of the mounting hole 47c so that it can be screwed into a male screw 48a formed on the mounting pin 48. As shown in FIG. 14, a locking surface 47d extending along the circumferential direction of the joint body 47 is formed on the inner peripheral surface of the central portion of the joint body 47, and the seal member 17 is formed on the locking surface 47d. It is installed. As shown in FIG. 15, the mounting cylinder 49 is formed in a substantially cylindrical shape, and extends outward so as to be orthogonal to the axis of the mounting cylinder 49 at the opposite position of the outer peripheral edge on the left side thereof. Further, an engagement piece 49a extending in parallel with the axis is formed.
[0088]
In order to connect the water pipe 11 to the joint 46, first, after attaching the mounting cylinder 49 to the pipe main body 11a, a seal structure is formed at the end of the pipe main body 11a as in the second embodiment. To do. At this time, the bulging portion 11b for connection is formed in the pipe body 11a by the outer peripheral flange portion 32c of the outer sleeve 32. Next, the end of the tube body 11a on the side where the seal structure is formed is inserted into the connection tube portion 47a, and the side of the mounting tube 49 where the engagement piece 49a is not formed is inserted into the connection tube portion 47a. The engaging piece 49a is accommodated in the accommodating recess 47b. Then, when the attachment pin 48 is inserted into each attachment hole 47c, the male screw 48a is screwed into the female screw of the attachment hole 47c, and the attachment pin 48 is attached to the connecting cylinder portion 47a, the joint 46 is formed.
[0089]
As shown in FIG. 14, the engaging piece 49a is pressed inward by the mounting pin 48 by the mounting pin 48, and the right end surface of the mounting cylindrical body 49 as the engaging portion is the outer sleeve as the connecting bulging portion 11b. The outer peripheral flange 32c is engaged with the outer peripheral flange 32c, and the outer peripheral flange 32c is sandwiched between the right end surface of the mounting cylinder 49 and the inner surface of the connecting cylinder 47a. As a result, the mounting cylinder 49 is positioned by the mounting pin 48 so as not to be removed from the joint body 47, and the outer sleeve 32 is positioned and fixed in the joint body 47 by the mounting cylinder 49. Therefore, the pipe body 11a is connected to the connection cylinder portion 47a, and the pipe body 11a is prevented from coming off from the joint body 47. That is, the connection structure between the water pipes 11 and 46 is formed by the connection cylinder portion 47 a, the attachment cylinder body 49, and the attachment pin 48. And in order to connect the water pipe 11 provided with the edge part structure 10 to the joint 46, the water pipe 11 is connected by the connection structure formed between the end part of the pipe main body 11a and the connection cylinder part 47a of the joint 46. The joint 46 is connected in a state where it is prevented from coming off.
[0090]
-In 3rd Embodiment, you may expand the inner ring 37 so that the internal diameter of the expanded inner ring 37 may become smaller than or larger than the internal diameter in the non-expanded part of the pipe main body 11a.
[0091]
In the third embodiment, the diameter of the inner hole 41a of the fixed sleeve 41 is made larger than the outer diameter of the outer ring 38 that is attached to the pipe body 11a and expanded to form the connecting bulge portion 11b. May be. In such a configuration, the fixing sleeve 41 is connected to the outside of the connecting bulging portion 11b from the end on the side where the connecting bulging portion 11b is formed even after the connecting bulging portion 11b is formed in the pipe body 11a. It can be passed through and attached to the tube body 11a. Accordingly, the diameter of the inner hole 41a is smaller than the outer diameter of the connecting bulging portion 11b formed by the outer ring 38, and the fixing sleeve 41 is attached to the pipe body 11a before forming the connecting bulging portion 11b. Compared with the case where it must be kept, the connection work of the water flow pipe 11 and the joint 36 can be performed quickly.
[0092]
-In 3rd Embodiment, the outer ring 38 may be abbreviate | omitted and a seal structure may be formed only in the internal peripheral surface of the pipe main body 11a. When configured in this manner, the water flow pipe 11 and the joint 36 are connected by the engagement of the connection bulging portion 11b formed on the outer surface of the pipe main body 11a and the engagement surface 40b by expanding the diameter of the inner ring 37. .
[0093]
In the third embodiment, the engagement sleeve 40 may be integrally formed without being divided into the divided bodies 40a.
-You may connect the water pipe 11 provided with the edge part structure 10 shown in FIG. 16, and the coupling 50 as a connection body. The joint 50 is mainly formed by a joint body 51 and an attachment sleeve 52 as a connection means removal prevention sleeve. Note that the upper, lower, left, and right in the description of the water flow pipe 11, the joint body 51, and the mounting sleeve 52 correspond to the upper, lower, left, and right in FIG. The connecting cylinder 53 as an inner body provided at the right end of the tube main body 11a is formed in a cylindrical shape by a metal material, and an extending portion 53a extending while expanding outward is formed on the outer peripheral surface of the right end edge. It is formed as a fixed part. The joint body 51 made of a synthetic resin material or a metal material is formed in a substantially cylindrical shape, a connection cylinder portion 51a is formed at the left end of the joint body 51, and a pipe body (not shown) is formed at the right end so as to be connectable. ing. The left end surface of the connecting tube portion 51a is formed in a taper shape so as to increase in diameter toward the central portion of the joint body 51, and a male screw 51b is threaded on the outer peripheral surface of the connecting tube portion 51a.
[0094]
The mounting sleeve 52 is formed in a substantially cylindrical shape from a synthetic resin material or a metal material, and an engaging step portion 52a extending along the circumferential direction is formed as an engaging portion on the inner peripheral surface of the central portion of the mounting sleeve 52. ing. A female screw 52b that can be screwed into the male screw 51b is threaded on the inner peripheral surface on the right side of the mounting sleeve 52.
[0095]
In order to connect the water pipe 11 to the joint 50, first, the mounting sleeve 52 is attached to the pipe body 11a in advance. Subsequently, the connecting cylinder 53 inserted inside the tube main body 11a is expanded in diameter to form a seal structure on the inner peripheral surface of the tube main body 11a, and the connecting bulging portion 11b is formed on the outer peripheral surface of the tube main body 11a. Is formed to form a water pipe 11 having an end structure 10. Next, the inner peripheral surface of the extending portion 53a is brought into contact with the left end surface of the joint main body 51, and the attachment sleeve 52 is screwed into the joint main body 51 in the contact state to form the joint 50.
[0096]
At this time, since the connecting bulging portion 11b engages with the inner peripheral edge as the engaging portion of the mounting sleeve 52 attached to the joint body 51, the pipe body 11a is prevented from coming out of the joint 50. That is, in order to connect the water pipe 11 provided with the end structure 10 to the joint 50, the water pipe 11 is formed by the connection structure formed between the end of the pipe body 11 a and the connection cylinder part 51 a of the joint 50. The joint 50 is connected in a state where it is prevented from coming off.
[0097]
In a connected state of the water pipe 11 to the joint 50, an extension portion 53a is sandwiched between the left end surface of the joint body 51 and the locking step portion 52a of the mounting sleeve 52, and the inner peripheral surface of the extension portion 53a and the joint The left end surface of the main body 51 is pressed against each other to form a seal structure. Therefore, the leakage of fluid into the joint 50 can be prevented by the seal structure between the extending portion 53a and the left end surface of the joint body 51. Furthermore, fluid from between the pipe body 11 a and the connection cylinder 53 to between the pipe body 11 a and the joint body 51 is provided by a seal structure between the inner periphery of the pipe body 11 a and the inner periphery of the connection cylinder 53. Can be prevented from leaking out.
[0098]
A connecting structure 54 as an inner body shown in FIG. 17 may be attached to the pipe body 11a to form a seal structure on the water pipe 11. The connecting member 54 is formed in a substantially cylindrical shape from a metal material. A connection flange 54b that protrudes outward along the circumferential direction of the connection member 54 is formed as a fixed portion on the outer peripheral edge of one end of the connection member 54, and an insertion hole into which the bolt 55 can be inserted into the connection flange 54b. 54c is formed in two places.
[0099]
Now, the diameter of the connecting member 54 is increased in a state where the connecting member 54 is inserted inside the right end portion of the tube main body 11a. Then, the connection member 54 press-contacts to the inner peripheral surface of the pipe body 11a, a seal structure is formed on the inner peripheral surface of the pipe body 11a, and the water flow pipe 11 including the end structure 10 is formed.
[0100]
In order to connect the water pipe 11 to another water pipe 11 provided with the connection member 54 using the water pipe 11 as a connection body, a bolt 55 is inserted into the insertion hole 54c of each connection member 54, and a nut 56 is screwed into each bolt 55. Then, the connection members 54 are connected and fixed. As a result, the water pipes 11 can be connected to each other. In addition, the water flow pipe 11 provided with the seal structure in advance and provided with the end structure 10 may be carried into the construction site, and the water flow pipes 11 may be connected to each other at the construction site.
[0101]
In the first to third embodiments, the seal structure and the connecting bulging portion 11b are formed at one end of the tube main body 11a, but the sealing structure and the connecting bulging portion 11b are formed at both ends of the tube main body 11a. May be.
[0102]
-In the 1st-3rd embodiment, you may enlarge an inner body using the diameter expansion tool 60 shown in FIG. As shown in FIG. 18, the diameter expansion tool 60 is mainly formed by, for example, the cylindrical body 13 of the first embodiment and a drawing body 62 inserted into the end portion of the tube main body 11a. The drawn body 62 is formed in a cylindrical shape from a metal material. In FIG. 18, an enlarged diameter portion 62 a having a constant outer diameter is formed at the left end portion of the drawn body 62 along the axial direction of the drawn body 62. ing. The outer diameter of the enlarged diameter portion 62 a is formed larger than the inner diameter of the cylindrical body 13. Further, the drawn body 62 is formed in a tapered shape so that the outer diameter is reduced from the enlarged diameter portion 62 a toward the right end side of the drawn body 62.
[0103]
Further, an extraction pin 63 for performing an operation of extracting the extraction body 62 from the inside of the tube main body 11a is attached to the extraction body 62. The pull-out pin 63 is detached from the right side of the pull-out body 62 when the head 63a of the pull-out pin 63 disposed in the pull-out body 62 is engaged with the inner peripheral edge on the right end side of the pull-out body 62. It is attached so that there is no. And the said extraction body 62 is inserted inside the said cylinder 13, and the same cylinder 13 and the extraction body 62 are integrated.
[0104]
Next, a method for forming a seal structure on the water conduit 11 using the diameter expansion tool 60 will be described. First, as shown in FIG. 18, the drawing body 62 and the cylinder 13 of the diameter expanding tool 60 are inserted into the pipe body 11a. Subsequently, when a pulling pin 63 is pulled away from the tube main body 11a using a dedicated pulling tool, the pulling body 62 locked by the head 63a is moved away from the tube main body 11a by the movement of the pulling pin 63. Be pulled. Then, since the outer diameter of the outer peripheral surface of the extracted body 62 increases toward the left end side of the extracted body 62, the extracted body 62 contacts the inner peripheral surface of the cylindrical body 13 as the extracted body 62 moves. The outer diameter of the drawn body 62 to be increased is increased, and the cylindrical body 13 is increased in diameter. Then, as the diameter of the cylindrical body 13 is increased from the inside, as shown in FIG. 19, a seal structure is formed between the outer peripheral surface of the cylindrical body 13 and the inner peripheral surface of the tube main body 11a. When the extraction pin 63 is further pulled, the cylinder 13 is in pressure contact with the inner peripheral surface of the tube main body 11a, so that the cylinder 13 remains in the tube main body 11a and the extraction body 62 is extracted from the tube main body 11a. As a result, the cylindrical body 13 forms the sealing structure and the connecting bulging portion 11 b at the end of the tube main body 11 a, and the water pipe 11 having the end structure 10 is formed.
[0105]
-In 1st-3rd embodiment, when connecting a connection body and the water flow pipe 11, the water flow pipe 11 formed the seal structure in the water flow pipe 11, However, the water flow pipe 11 by which the seal structure was previously formed in the pipe main body 11a is used. It may be formed. And the water flow pipe 11 in which the edge part structure 10 was formed may be carried in to the construction site of the water flow pipe 11, and the water flow pipe 11 in which the seal structure was formed previously, and a connection body may be connected. At this time, since the bulging portion 11b for connection is formed in the water pipe 11, it is preferable to use a connection body formed so that the bulging portion 11b for connection does not hinder the connection. For example, as shown in FIG. 20, a joint 70 having substantially the same structure as the joint 12 of the first embodiment is used. The joint 70 includes the joint body 14 of the first embodiment, and also includes a fixing sleeve 71 as an attachment body made of a synthetic resin material or a metal material, and an engagement sleeve 72 as an engagement body.
[0106]
Although not shown, the engagement sleeve 72 is formed by assembling a pair of divided bodies having a semi-cylindrical shape. The divided bodies are integrated by connecting one side edges thereof, and are formed so that the divided bodies can be separated or assembled around the connecting portion. Further, on the inner peripheral surface of the engagement sleeve 72, when the engagement sleeve 72 is mounted on the outer peripheral surface of the pipe body 11a, an engagement step portion as an engagement portion with which the connection bulging portion 11b can be engaged. 72 b is formed along the circumferential direction of the engagement sleeve 72. On the left end side of the fixed sleeve 71, an inner hole 71a having a diameter slightly larger than the outer diameter on the left end side of the engagement sleeve 72 is formed. The diameter of the inner hole 71a is set to be slightly larger than the outer diameter of the connecting bulging portion 11b formed in the pipe body 11a.
[0107]
Now, a seal structure and a connecting bulge 11b are formed at the end of the pipe body 11a. In order to connect the water pipe 11 provided with the end structure 10 to the joint 70, first, the bulge for connection of the pipe main body 11a is used. The fixing sleeve 71 is attached to the tube main body 11a through the inner hole 71a of the fixing sleeve 71 from the end on the side where the portion 11b is formed. At this time, the diameter of the inner hole 71a of the fixing sleeve 71 is set to be larger than the outer diameter of the connecting bulging portion 11b of the pipe body 11a. Therefore, the outer diameter of the connecting bulging portion 11b is smaller than the diameter of the inner hole 71a, and the fixing sleeve 71 is attached to the pipe body 11a without the connecting bulging portion 11b and the peripheral edge of the inner hole 71a being locked. Is done.
[0108]
Next, the engagement sleeve 72 is arranged on the outer peripheral side of the connecting bulging portion 11b in a state of being divided into a pair of divided bodies. Then, the pair of split bodies are assembled so that the connecting bulging portion 11b engages with the engaging stepped portion 72b to form the engaging sleeve 72, and the engaging sleeve 72 is attached to the tube main body 11a. Next, the end portion of the tube main body 11 a to which the engagement sleeve 72 is attached is inserted into the connecting tube portion 14 a of the joint main body 14.
[0109]
Then, the female screw 71 b of the fixed sleeve 71 is screwed into the male screw 15 of the joint body 14. Then, as the fixing sleeve 71 is screwed into the joint body 14, the inner peripheral surface of the inner hole 71 a gradually comes into pressure contact with the outer peripheral surface of the engaging sleeve 72, and the diameter of the engaging sleeve 72 is reduced. At the same time, the engagement sleeve 72 is pressed inwardly in the connecting cylinder part 14a, and the pipe body 11a with which the engaging step part 72b of the engaging sleeve 72 is engaged is also pressed inwardly in the connecting cylinder part 14a.
[0110]
As a result, the right end surface of the tube main body 11 a is in contact with the second contact surface 18, and the right end surface of the engagement sleeve 72 is in contact with the end surface of the joint body 14. Further, the engagement sleeve 72 is held inside the fixed sleeve 71 attached to the joint main body 14, and the removal from the fixed sleeve 71 is prevented. Then, the joint body 14, the engagement sleeve 72, and the fixed sleeve 71 are assembled to form the joint 12. At the same time, the engagement step portion 72b of the engagement sleeve 72 is engaged with the connection bulging portion 11b so that the tube main body 11a is connected in a state of being prevented from coming off from the connection cylinder portion 14a, and the end structure 10 is provided. The water pipe 11 and the joint 12 are connected.
[0111]
Accordingly, since the inner hole 71a of the fixing sleeve 71 is formed larger than the outer diameter of the connecting bulging portion 11b, the connecting bulging portion 11b prevents the connection work when the water pipe 11 is connected to the joint 70. Therefore, the connection work between the water conduit 11 and the joint 70 can be easily performed. As a result, the end structure 10 can be easily formed at the construction site of the water pipe 11 and the joint 70 as compared with the case where the seal structure is formed on the water pipe 11 and the burden on the operator is reduced. can do.
[0112]
As shown in FIG. 21, the end structure 10 is formed on the water pipe 11 using the end forming member 80 in which the inner body and the outer body are integrally formed, and the end structure 10 is further provided. You may connect the water pipe 11 and a connection body. Note that the vertical and horizontal directions of the water pipe 11 and the end forming member 80 correspond to the vertical and horizontal directions in FIG. The end portion forming member 80 made of a metal material has a substantially cylindrical shape. On the left side of the end portion forming member 80 is an inner portion 80a as an annular inner body, and a circle positioned outside the inner portion 80a. An outer portion 80b is formed as an annular outer body.
[0113]
An annular groove 80c having an annular shape is formed on the left side of the end portion forming member 80 between the inner portion 80a and the outer portion 80b, and the end portion of the pipe body 11a can be inserted into the annular groove 80c. Is formed. That is, the inner portion 80a has an inner diameter smaller than the inner diameter of the tube body 11a. When the tube body 11a is inserted into the annular groove 80c, the inner portion 80a is inserted inside the tube body 11a, and the outer portion 80b is formed of the tube. It is formed so as to be arranged outside the main body 11a. The synthetic resin interposing member 84 inserted between the inner peripheral surface of the annular groove 80c and the outer peripheral surface of the tube main body 11a inserted into the annular groove 80c is a cylindrical body having a substantially cylindrical shape. It is cut out along the axial direction and formed into a C-shaped cross section.
[0114]
On the right side of the end portion forming member 80, an extending portion 80d extending from the inner portion 80a and the outer portion 80b is formed as a fixed portion. Seal members 17 are mounted at two locations on the outer peripheral surface of the extension portion 80d, and the inner diameter of the extension portion 80d is formed to be substantially the same as the inner diameter of the tube body 11a. As shown in FIG. 22, the joint 82 connected to the end portion forming member 80 is formed in a substantially cylindrical shape by a synthetic resin material or a metal material, and a connecting cylinder portion 82a is formed on the left side thereof. .
[0115]
Now, in order to form a seal structure in the pipe body 11a using the end forming member 80, first, the interposing member 84 is attached to the pipe body 11a, and then, as shown in FIG. A diameter increasing member 81 for expanding the inner portion 80a of the forming member 80 is inserted into the pipe body 11a. The diameter-expanding member 81 includes a bulging portion 81a having a diameter substantially the same as the inner diameter of the tube main body 11a at the left end, and a gripping portion 81b extending linearly from the bulging portion 81a.
[0116]
The end portion of the tube body 11a is inserted into the annular groove 80c of the end portion forming member 80, the inner portion 80a is inserted inside the tube body 11a, and the outer portion 80b is disposed outside the tube body 11a. The end portion forming member 80 is attached to the tube main body 11a as described above. Furthermore, the interposition member 84 is fitted between the inner peripheral surface of the annular groove 80c and the outer peripheral surface of the tube main body 11a, and subsequently, the gripping portion 81b is gripped and the diameter-expanding member 81 is separated from the tube main body 11a. The bulging portion 81a is passed through the inner portion 80a.
[0117]
Then, the inner portion 80a, the tube main body 11a, the interposition member 84, and the outer portion 80b are expanded in diameter by the bulging portion 81a having substantially the same diameter as the inner diameter of the tube main body 11a, and the inner peripheral surface and the intermediate portion of the inner portion 80a. The inner peripheral surface of the mounting member 84 is pressed against both the inner and outer peripheral surfaces of the pipe body 11a to form a seal structure. As a result, a seal structure is formed at the end of the pipe body 11a, and the water flow pipe 11 including the end structure 10 is formed. When the inner portion 80a is inserted into the tube main body 11a, the extension portion 80d extends from the end surface of the tube main body 11a.
[0118]
In order to connect the water pipe 11 formed with the end structure 10 to the joint 82, the extending part 80 d is fitted into the connecting cylinder part 82 a of the joint 82 as shown in FIG. 22. Then, the pair of seal members 17 are in pressure contact with the inner peripheral surface of the connection tube portion 82a, and further, the inner peripheral surface of the connection tube portion 82a is pressed outward by the elastic force of the seal member 17 itself. Therefore, the end portion forming member 80 is connected to the connecting cylinder portion 82a by the extending portion 80d, and the joint 82 and the water pipe 11 are connected.
[0119]
Therefore, by using the end forming member 80, a seal structure can be formed in the pipe body 11a, and the water pipe 11 can be easily connected to the joint 82. The end forming member 80 is connected to the water pipe 11 to form a seal structure, the water pipe 11 provided with the end structure 10 is carried into the construction site, and the joint 82 and the water pipe 11 are connected. Also good.
[0120]
Further, the interposition member 84 may be omitted, and in this case, the size of the annular groove 80c is adjusted so that only the tube main body 11a is fitted into the annular groove 80c. Further, instead of the interposing member 84, an elastic member such as a coil spring or a spring member may be interposed between the outer peripheral surface of the tube main body 11a and the inner peripheral surface of the annular groove 80c. When comprised in this way, an elastic member can press both surfaces of the outer peripheral surface of the pipe | tube main body 11a, and the internal peripheral surface of the annular groove 80c, respectively, and can control | release the water flow pipe 11 from the annular groove 80c.
[0121]
A sleeve 86 as an inner body shown in FIG. 23 may be attached to the pipe body 11a to form a seal structure on the water pipe 11. The sleeve 86 is made of a metal material, and includes a cylindrical inner portion 86a and an engagement flange portion 86b formed to protrude outward at the right end of the inner portion 86a. The outer diameter of the inner portion 86a is slightly smaller than the inner diameter of the tube main body 11a, and is formed so as to be fitted into the tube main body 11a. The outer diameter of the engagement flange 86b is formed larger than the inner diameter of the tube body 11a, and when the inner portion 86a is inserted into the tube body 11a, the end surface of the tube body 11a is engaged with the engagement flange 86b. Is formed. An inner peripheral ridge 86c that protrudes inward is integrally formed at the inner peripheral edge of the tip of the inner portion 86a.
[0122]
In order to expand the diameter of the sleeve 86, the drawing body 62 and the drawing pin 63 are inserted inside the distal end side of the sleeve 86, and a substantially dish-shaped cap member 85 is fitted inside the base end side of the sleeve 86. ing. The shaft portion of the extraction pin 63 passes through the center of the cap member 85. In the state in which the cap member 85 is fitted in the sleeve 86, the length in the axial direction of the drawn body 62 is shorter than the length between the inner peripheral protrusion 86c and the cap member 85. The pull member 62 and the sleeve 86 can be assembled in a stable state by the cap member 85, and the shaft portion of the pull pin 63 can be supported at the center of the opening of the cap member 85. The cap member 85 may be omitted.
[0123]
And while fitting the inner part 86a in the one end part of the pipe | tube main body 11a, the engagement collar part 86b is engaged with the end surface of the pipe | tube main body 11a. Further, the inner peripheral protrusion 86c and the inner portion 86a are expanded in diameter using the drawn body 62. Then, as shown in FIG. 24, the outer peripheral surface of the inner peripheral protrusion 86c is pressed against the inner peripheral surface of the tube main body 11a, a seal structure is formed on the inner peripheral surface of the tube main body 11a, and the end structure 10 is provided. A water pipe 11 is formed. Further, the connecting bulging portion 11b is formed in a portion where the inner peripheral ridge 86c is expanded in diameter. The sleeve 86 may be attached to both ends of the tube main body 11a, and the seal structure and the connecting bulging portion 11b may be formed on both ends of the tube main body 11a.
[0124]
The water pipe 11 provided with the end structure 10 is connected to a joint 87 as a connection body shown in FIG. The joint 87 is used to connect the water pipes 11 to each other or as a part of a branch joint (header), and mainly includes a joint body 88, a fixing sleeve 89, a split ring 90, and a ring member 91 formed in a substantially cylindrical shape. Is formed.
[0125]
Connection tube portions 92 are respectively formed at both ends (only the left end is shown in FIG. 24) of the joint body 88 formed in a substantially cylindrical shape by a synthetic resin material. A first placement surface 93 is formed on the inner peripheral surface at the back of each connection tube portion 92, and on the inner peripheral surface of the connection tube portion 92 located on the left side of the joint body 88 from the first placement surface 93, A second placement surface 94 having an inner diameter and an outer diameter larger than those of the first placement surface 93 is formed. An O-ring 95 made of a rubber material is provided on each of the first placement surface 93 and the second placement surface 94.
[0126]
A contact surface 96 having an inner diameter and an outer diameter larger than those of the second mounting surface 94 is formed on the inner peripheral surface of the connecting tube portion 92 located on the left side of the joint body 88 with respect to the second mounting surface 94. . A male screw 97 is threaded on the outer peripheral surface of the connecting tube portion 92. The fixing sleeve 89 is provided as an attachment that forms connection means. The fixing sleeve 89 is formed in a substantially cylindrical shape from a synthetic resin material, and a female screw 89 a that can be screwed into the male screw 97 is threaded on the inner peripheral surface on the right side of the fixing sleeve 89. Further, a locking surface 89 b that protrudes inward is formed on the inner peripheral surface of the fixed sleeve 89. In addition, a tapered surface 89c is formed on the inner peripheral surface of the fixing sleeve 89 connected to the inner peripheral edge of the locking surface 89b, and the diameter of the taper surface 89c decreases from the locking surface 89b side toward the left end of the fixing sleeve 89. Yes. Further, a locking rib 89d is provided on the inner peripheral edge at the left end of the fixed sleeve 89 so as to project inward.
[0127]
The split ring 90 is provided as an engaging body that forms connection means. The split ring 90 is formed in a C-shaped cross section by cutting a cylindrical body made of a synthetic resin material along the axial direction. The split ring 90 is formed in a tapered shape whose outer diameter is reduced from the right end toward the left end. In addition, the split ring 90 is formed so that the right end surface engages with the connecting bulging portion 11b as an engaging portion in a state where the split ring 90 is inserted into the connecting cylinder portion 92. The ring member 91 is formed in an annular shape from a synthetic resin material. With the fixing sleeve 89 screwed to the joint body 88, the right end contacts the contact surface 96 and the left end engages with the locking surface 89b. It is stopped and held between the contact surface 96 and the locking surface 89b.
[0128]
In a state where the ring member 91 is held between the contact surface 96 and the locking surface 89b, an O-ring 95 is provided between the inner peripheral edge of the ring member 91 and the second mounting surface 94. It is supposed to be retained. The O-ring 95 is mounted on the first and second mounting surfaces 93 and 94, and the ring member 91 is mounted on the contact surface 96, and the fixing sleeve 89 in which the split ring 90 is accommodated. Is screwed to the joint body 88, and the joint 87 is assembled. At this time, the left end surface of the split ring 90 is locked to the locking rib 89d of the fixed sleeve 89, and the split ring 90 is prevented from coming out of the fixed sleeve 89.
[0129]
In order to connect the water pipe 11 formed with the connecting bulging portion 11b and the joint 87, first, the fixing sleeve 89 is slightly screwed off from the joint body 88, and the tapered surface 89c and the split ring 90 are formed. A gap is formed between the outer peripheral surface and the split ring 90 so that the diameter can be expanded. Then, the connecting bulging portion 11 b side of the tube main body 11 a is passed through the fixed sleeve 89 and inserted into the connecting tube portion 92. Then, the outer peripheral surface of the engagement flange 86b comes into contact with the inner peripheral surface of the split ring 90, and the pipe main body 11a is inserted into the split ring 90 to expand the diameter of the split ring 90. Passing through the split ring 90 of the protruding portion 11b is allowed.
[0130]
Then, the water conduit 11 is inserted into the joint 87 until the end surface of the engagement flange 86 b comes into contact with the O-ring 95 placed on the first placement surface 93. At this time, the connecting bulging portion 11 b is located on the inner side of the joint body 88 from the right end surface of the split ring 90 and is disposed at a position corresponding to the ring member 91. Subsequently, when the fixing sleeve 89 is screwed into the connecting tube portion 92, the tapered surface 89c is pressed against the outer peripheral surface of the split ring 90, and the diameter of the split ring 90 is gradually reduced. When the fixing sleeve 89 is screwed into the connecting tube portion 92, the inner surface of the split ring 90 is pressed against the outer peripheral surface of the pipe body 11a, and the right end surface of the split ring 90 is engageable with the connecting bulge portion 11b. Placed in position. Further, the O-ring 95 placed on the first placement surface 93 is in pressure contact with the engagement flange 86b, and the O-ring 95 placed on the second placement surface 94 is placed on the outer peripheral surface of the pipe body 11a. Press contact.
[0131]
As a result, the connecting bulging portion 11 b engages with the split ring 90, and the split ring 90 is accommodated so as not to come out of the fixed sleeve 89. Therefore, the state in which the connecting bulging portion 11b is engaged with the split ring 90 is maintained, and the pipe main body 11a is prevented from coming off by the connecting cylindrical portion 92, so that the water pipe 11 can be prevented from coming off from the joint 87.
[0132]
Further, the outer peripheral surfaces of the inner peripheral protrusion 86c and the inner portion 86a are pressed against the inner peripheral surface of the tube main body 11a to form a seal structure. With the seal structure, the inner peripheral surface of the tube main body 11a and the outer peripheral surface of the sleeve 86 are formed. The water can be stopped. In addition, the pair of O-rings 95 can stop water between the outer surface of the tube main body 11 a and the inner peripheral surface of the connection tube portion 92. Even if water leaks from between the inner peripheral surface of the tube main body 11a and the outer peripheral surface of the sleeve 86, the O-ring 95 mounted on the second mounting surface 94 causes the outer surface of the tube main body 11a. And the inner peripheral surface of the connecting cylinder 92 can be stopped. Therefore, it is possible to prevent the occurrence of a problem that water leaks from the joint 87.
[0133]
Furthermore, since the engagement flange 86b is provided on the end surface of the pipe body 11a, the entire circumferential direction of the end surface of the engagement flange 86b with respect to the O-ring 95 mounted on the first mounting surface 93 is achieved. , And the water can be reliably stopped between the engagement flange 86b and the O-ring 95. Therefore, water is leaked from between the O-ring 95 and the end surface of the tube main body 11a as in the case where the engagement flange 86b is not provided and the end surface of the tube main body 11a is cut obliquely. The fear can be eliminated.
[0134]
Therefore, it is possible to prevent the occurrence of a problem that water leaks from the joint 87. As a result, by inserting the end of the pipe main body 11a into the connecting cylinder 92, the water flow pipe 11 and the joint 87 can be connected with the seal structure, and the connecting cylinder is formed to form the seal structure. Unlike the conventional case where the tube main body 11a is externally fitted to the portion, the load acting on the tube main body 11a can be suppressed.
[0135]
In the above description, the water pipe 11 is connected in a state where the joint body 88, the fixing sleeve 89, the split ring 90, and the ring member 91 are assembled. However, the following connection work may be used. In other words, the connecting tube portion 92 accommodated so that the ring member 91 contacts the contact surface 96 in a state where the fixing sleeve 89 and the split ring 90 are mounted in advance on the water pipe 11 in which the connecting bulging portion 11 b is formed. The water pipe 11 is inserted into the inside. Then, the fixing sleeve 89 may be screwed into the connection cylinder portion 92 to form the joint 87, and the water pipe 11 may be connected to the joint 87. Note that. In the joint 87, the joint body 88 and the fixing sleeve 89 may be formed of a metal material, and the ring member 91 may be integrally formed with the joint body 88. The split ring 90 is molded from a synthetic resin material.
[0136]
-In each embodiment, although the water flow pipe 11 was formed only with the synthetic resin material, you may provide a metal layer in the thickness of the pipe main body 11a as the water flow pipe 11 made from a synthetic resin material. When comprised in this way, it can prevent that oxygen passes the water pipe 11 with a metal layer. Therefore, it is possible to prevent the occurrence of a problem that oxygen is contained in a fluid such as water flowing through the water flow pipe 11 and the metal connection body is rusted by the oxygen.
[0137]
In the diameter expansion jig 21, the inner peripheral shape of the main sleeve 22 may be formed in an octagonal cross section or a hexagonal cross section, and the head of the movable bolt 24 may be formed in an octagonal cross section or a hexagonal cross section. In this configuration, when the nut 26 is screwed or screwed into the male screw 24c, the head of the movable bolt 24 interferes with the inner peripheral surface of the main sleeve 22, and the movable bolt 24 is moved to the main sleeve 22. It can be moved without being rotated. Therefore, the engagement groove 24b for restricting the rotation of the movable bolt 24 and the engagement pin 27 can be omitted.
[0138]
-In each embodiment, although the end structure 10 was formed in the water pipe 11 in the construction site which connects the water pipe 11 and a connection body, the end structure 10 was previously formed in the water pipe 11 in the factory etc. May be. And the water flow pipe 11 provided with the edge part structure 10 may be carried in to a construction site, and the water flow pipe 11 and a connection body may be connected. At this time, after inserting the water pipe 11 into a sheath pipe or the like that protects the outer surface of the water pipe 11, the water pipe 11 and the connection body can be immediately connected. In addition, in order to externally fit the fixing ring to the end of the pipe body, the fixing ring is attached to the pipe body, and after passing the fixing ring and the water pipe through the sheath, the water pipe and the connecting body are connected. Unlike the conventional case where necessary, the connection work between the water pipe 11 and the connecting body can be easily performed.
[0139]
-You may connect the water flow pipe 11 provided with the edge part structure 10 to the branch joint, faucet fixture, etc. as a connection body.
-You may expand an inner body using the other tools of the diameter expansion jig | tool 21, the diameter expansion member 81, and the diameter expansion tool 60 which were used in each embodiment.
[0141]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, it is possible to minimize the load acting on the end during diameter expansion work of the pipe main body and prevent deformation of the end of the pipe main body. In the connected state between the tube body and the connection body, it is possible to prevent the fluid from leaking out at the end of the tube body.
[0142]
in addition, It is possible to effectively prevent the fluid from leaking from the inner peripheral surface and the outer peripheral surface of the end portion of the tube main body.
[0143]
Claim 2 According to the invention described in claim 1 In addition to the effects of the invention described in (1), a seal structure can be easily formed on the inner peripheral surface and the outer peripheral surface of the pipe body.
Claim 3 According to the invention described in claim 1 Or claims 2 In addition to the effects of the invention described in (1), a seal structure can be easily formed on the inner peripheral surface and the outer peripheral surface of the pipe body.
[0144]
Claim 4 According to the invention described in claim 1 In addition to the effects of the invention described in (1), it is possible to effectively prevent fluid leakage between the inner peripheral surface of the outer body and the outer peripheral surface of the tube body.
[0145]
Claim 5 According to the invention described in claim 1 to claim 1 4 In addition to the effect of the invention described in any one of the above, it is possible to easily connect the pipe body provided with the seal structure to the connection body in a state of being prevented from coming off.
[0146]
Claim 6 According to the invention described in It is possible to prevent the deformation of the end of the tube body by minimizing the load acting on the end during diameter expansion work of the tube body, and the end of the tube body in the connected state between the tube body and the connection body. The fluid can be prevented from leaking out. in addition, The pipe body and the connection body can be easily connected.
Claim 7 According to the invention described in the above, it is possible to prevent the deformation of the end of the pipe main body by minimizing the load acting on the end during the diameter expansion work of the pipe main body, and to connect the pipe main body and the connection body. In the state, it is possible to prevent fluid from leaking out at the end of the tube body.
[0147]
Claim 8 ~ Claim 14 According to the invention described in any one of the above, it is possible to prevent the deformation of the end of the tube main body by minimizing the load acting on the end during diameter expansion work of the tube main body, It is possible to provide a connection structure between a water pipe and a connection body that can prevent leakage of fluid at an end portion of the pipe body in a connection state with the connection body.
[0148]
Claim 15 According to the invention described in the above, it is possible to prevent the deformation of the end of the pipe main body by minimizing the load acting on the end during the diameter expansion work of the pipe main body, and to connect the pipe main body and the connection body. In this state, it is possible to provide a method for forming an end structure that can prevent fluid from leaking out at the end of the tube body. In addition, it is possible to easily form a seal structure that prevents fluid from leaking out at the end of the tube body.
[Brief description of the drawings]
FIG. 1 is a partial side sectional view showing an end structure of a water conduit according to a first embodiment.
FIG. 2 is a partial side sectional view showing a connection structure between a water conduit and a joint according to the first embodiment.
FIG. 3 is an exploded perspective view showing a water pipe and a joint according to the first embodiment.
FIG. 4 is a perspective view showing a diameter expansion jig.
FIG. 5 is a side sectional view showing a state before the diameter of the cylindrical body is expanded by a diameter expansion jig.
FIG. 6 is a side cross-sectional view showing a state in which the diameter of the tube main body and the cylinder is expanded by a diameter expansion jig.
FIG. 7 is a partial side sectional view showing an end structure of a water conduit according to a second embodiment.
FIG. 8 is a partial side sectional view showing a connection structure between a water pipe and a joint according to a second embodiment.
9A is an exploded perspective view showing a water pipe and a joint according to a second embodiment, and FIG. 9B is a front view showing a state in which the removal prevention sleeve is disassembled into divided bodies.
FIG. 10 is a partial side cross-sectional view showing a state where an inner sleeve and an outer sleeve are attached to a pipe body.
FIG. 11 is a side cross-sectional view showing a state in which the diameter of a pipe body is expanded by a diameter expansion jig.
FIG. 12 is a partial side sectional view of a connection structure between a water pipe and a joint according to a third embodiment.
FIG. 13A is an exploded perspective view showing a water pipe and a joint according to a third embodiment, and FIG. 13B is a front view showing a state in which an engagement sleeve is disassembled into divided bodies.
FIG. 14 is a partial side sectional view showing a connection structure between another example of a joint and a water pipe.
FIG. 15 is an exploded perspective view showing another example of a joint and a water pipe.
FIG. 16 is a partial side cross-sectional view showing a connection structure between another joint and a water pipe.
FIG. 17 is a partial side sectional view showing a connection structure between water pipes according to another example.
FIG. 18 is a side sectional view showing another example of the diameter expanding tool.
FIG. 19 is a side cross-sectional view showing a state where the diameter of the pipe body is expanded using a diameter expanding tool.
FIG. 20 is a partial side cross-sectional view showing a connection structure between another joint and a water pipe.
FIG. 21 is a side sectional view showing an end forming member.
FIG. 22 is a side sectional view showing a connection structure between a water pipe and a joint using an end forming member.
FIG. 23 is a partial side cross-sectional view showing another example of the inner body.
FIG. 24 is a partial side cross-sectional view showing a connection structure between another joint and a water pipe.
FIG. 25 is a partial side sectional view showing a connection structure between a conventional water pipe and a joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... End part structure, 11 ... Water pipe, 11a ... Pipe main body, 11b ... Expansion part for connection, 12, 30, 36, 46, 50, 70, 82, 87 ... Joint as connection body, 13 ... Inner body , 14a, 34a, 39a, 47a, 51a, 82a, 92... Connection cylinder, 20, 35... Detachable prevention sleeve forming connection means, 31. Outer sleeve, 35a, 40a ... divided body, 35b, 72b ... engagement step part as engagement part, 37 ... inner ring as inner body, 38 ... outer ring as outer body, 40, 72 ... engagement body 40b... Engaging surface as an engaging portion, 41, 71, 89... Fixing sleeve as attachment body, 48... Mounting pin as pin body, 49. , 52 ... an attachment sleeve as a connection means, 52a ... a locking step as an engagement part, 53 ... a connection cylinder as an inner body, 53a, 80d ... an extension part as a fixing part, 54 ... Connection member as inner body, 54b ... Connection flange as fixed part, 80a ... Inner part as inner body, 80b ... Outer part as outer body, 86 ... Sleeve as inner body, 90 ... As engagement body Split ring.

Claims (15)

接続体に接続された合成樹脂材料製の管本体の端部における流体の漏れ出しを防止する通水管の端部構造であって、
前記管本体の端部の内側には環状をなす金属材料製のインナー体が挿入され、前記管本体の端部の外側にはアウター体が装着され、同インナー体が内側から拡径されて当該インナー体の外周面と管本体の内周面との間及びアウター体の内周面と管本体の外周面との間に管本体内を流通する流体の漏れ出しを防止するシール構造が形成されていることを特徴とする通水管の端部構造。A water pipe end structure for preventing fluid leakage at the end of a pipe body made of a synthetic resin material connected to a connection body,
An inner body made of an annular metal material is inserted inside the end portion of the tube body, an outer body is attached to the outside of the end portion of the tube body, and the inner body is expanded in diameter from the inside. A seal structure is formed between the outer peripheral surface of the inner body and the inner peripheral surface of the tube main body and between the inner peripheral surface of the outer body and the outer peripheral surface of the tube main body to prevent leakage of fluid flowing in the pipe main body. The end structure of the water pipe characterized by having. 前記インナー体とアウター体とは一体形成されていることを特徴とする請求項１に記載の通水管の端部構造。The end structure of the water pipe according to claim 1, wherein the inner body and the outer body are integrally formed. 前記アウター体はインナー体の拡径とともに拡径されることを特徴とする請求項１又は請求項２に記載の通水管の端部構造。The end structure of a water pipe according to claim 1 or 2, wherein the outer body is enlarged together with the diameter of the inner body. 前記アウター体は合成樹脂材料により形成され、拡径されたアウター体の拡径状態からの収縮によりアウター体が管本体の外周面に圧接していることを特徴とする請求項１に記載の通水管の端部構造。2. The passage according to claim 1, wherein the outer body is formed of a synthetic resin material, and the outer body is in pressure contact with the outer peripheral surface of the pipe body by contraction from the expanded diameter state of the outer body. End structure of water pipe. 前記インナー体の拡径により管本体の端部には、当該管本体を接続体に接続させるための接続用膨出部が形成されていることを特徴とする請求項１〜請求項４のいずれか一項に記載の通水管の端部構造。5. A bulging portion for connection for connecting the tube main body to a connecting body is formed at the end of the tube main body due to the diameter expansion of the inner body. The end structure of the water pipe according to claim 1. 接続体に接続された合成樹脂材料製の管本体の端部における流体の漏れ出しを防止する通水管の端部構造であって、A water pipe end structure for preventing leakage of fluid at the end of a pipe body made of a synthetic resin material connected to a connection body,
前記管本体の端部の内側には環状をなす金属材料製のインナー体が挿入され、同インナー体が内側から拡径されて当該インナー体の外周面と管本体の内周面との間に管本体内を流通する流体の漏れ出しを防止するシール構造が形成され、前記インナー体は管本体内への挿入状態において、管本体の端面から延出する延出部を備え、当該延出部は管本体を接続体に接続するための固定部であることを特徴とする通水管の端部構造。An inner body made of an annular metal material is inserted inside the end portion of the tube body, and the inner body is expanded from the inside to be between the outer peripheral surface of the inner body and the inner peripheral surface of the tube body. A seal structure for preventing leakage of fluid flowing through the pipe body is formed, and the inner body includes an extension part extending from an end surface of the pipe body in the inserted state into the pipe body, and the extension part Is a fixed portion for connecting the pipe body to the connection body, and has a water pipe end structure. 請求項１〜請求項６のいずれか一項に記載の端部構造を管本体の一端部又は両端部に備えたことを特徴とする通水管。A water flow pipe comprising the end structure according to any one of claims 1 to 6 at one end or both ends of a pipe body. 請求項５に記載の端部構造を備えた通水管を、接続体に接続するために管本体の端部と接続体の接続筒部との間に形成される通水管と接続体との接続構造であって、前記管本体の接続用膨出部と、前記接続筒部に設けられた接続手段の係合部との係合により形成されていることを特徴とする端部構造を備えた通水管と接続体との接続構造。The connection between the water pipe and the connection body formed between the end of the pipe body and the connection cylinder part of the connection body in order to connect the water flow pipe having the end structure according to claim 5 to the connection body. A structure having an end structure characterized by being formed by engagement between a connecting bulge portion of the pipe body and an engaging portion of a connecting means provided in the connecting cylinder portion. Connection structure between water pipe and connector. 前記接続手段は接続筒部に螺合して取り付けられ、その取付状態で接続用膨出部に係合する係合部を備えた抜脱防止スリーブにより形成されていることを特徴とする請求項８に記載の端部構造を備えた通水管と接続体との接続構造。The connecting means is formed by a removal prevention sleeve provided with an engagement portion that is screwed onto a connection tube portion and engages with a connection bulge portion in the attached state. A connection structure between a water pipe having the end structure according to 8 and a connection body. 前記接続手段は係合部を備えた係合体と、当該係合体と接続用膨出部との係合を維持すべく接続筒部に取り付けられる取着体とにより形成されていることを特徴とする請求項８に記載の端部構造を備えた通水管と接続体との接続構造。The connection means is formed by an engagement body having an engagement portion, and an attachment body attached to the connection cylinder portion so as to maintain the engagement between the engagement body and the connection bulge portion. The connection structure of the water flow pipe provided with the edge part structure of Claim 8, and a connection body. 前記取着体は前記係合体を内部に保持して接続筒部に螺合して取り付けられる固定スリーブにより形成されていることを特徴とする請求項１０に記載の端部構造を備えた通水管と接続体との接続構造。11. The water conduit having an end structure according to claim 10, wherein the attachment body is formed by a fixing sleeve that holds the engagement body inside and is screwed to a connection cylinder portion. And connection structure. 前記固定スリーブは管本体の接続用膨出部が形成された端部側から同接続用膨出部の外側を通過して管本体に装着されることを特徴とする請求項１１に記載の端部構造を備えた通水管と接続体との接続構造。12. The end according to claim 11, wherein the fixing sleeve is attached to the pipe body through the outside of the connecting bulge part from an end side where the connecting bulge part of the pipe body is formed. Connection structure between a water pipe and a connecting body with a partial structure. 前記取着体は接続筒部内に挿入された係合体の同接続筒部内からの抜脱を防止すべく接続筒部に取着されるピン体により形成されていることを特徴とする請求項１０に記載の端部構造を備えた通水管と接続体との接続構造。The said attachment body is formed by the pin body attached to a connection cylinder part in order to prevent the engagement body inserted in the connection cylinder part from pulling out from the inside of the connection cylinder part. The connection structure of a water pipe and a connection body provided with the edge part structure of description. 前記係合体は複数の分割体を組付けることにより形成され、前記接続用膨出部の形成後に、当該接続用膨出部に係合して取り付けられるように形成されていることを特徴とする請求項１０〜請求項１３のいずれか一項に記載の端部構造を備えた通水管と接続体との接続構造。The engagement body is formed by assembling a plurality of divided bodies, and is formed so as to be engaged with and attached to the connection bulge portion after the connection bulge portion is formed. The connection structure of the water flow pipe provided with the edge part structure as described in any one of Claims 10-13, and a connection body. 接続体に接続された合成樹脂材料製の管本体の端部における流体の漏れ出しを防止するため管本体の端部にシール構造を形成する通水管の端部構造の形成方法であって、前記管本体の端部の内側に環状をなす金属材料製のインナー体を挿入し、前記管本体の端部の外側にアウター体を装着し、同インナー体を内側から拡径して当該インナー体の外周面と管本体の内周面及びアウター体の内周面と管本体の外周面とを圧接させて管本体内を流通する流体の漏れ出しを防止するシール構造を形成することを特徴とする通水管の端部構造の形成方法。A method of forming an end structure of a water pipe that forms a seal structure at the end of a pipe body in order to prevent leakage of fluid at the end of the pipe body made of a synthetic resin material connected to a connection body, Insert an annular inner body made of a metal material inside the end of the tube body, attach an outer body to the outside of the end of the tube body, expand the diameter of the inner body from the inside, and The outer peripheral surface and the inner peripheral surface of the pipe main body and the inner peripheral surface of the outer body and the outer peripheral surface of the pipe main body are brought into pressure contact with each other to form a seal structure that prevents leakage of fluid flowing through the pipe main body. A method for forming the end structure of a water pipe.
JP2002362316A 2001-12-25 2002-12-13 End structure of water pipe, water pipe having the same end structure, connection structure between water pipe and connecting body, and method of forming end structure of water pipe Expired - Fee Related JP4198453B2 (en)

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JP2002362316A JP4198453B2 (en) 2001-12-26 2002-12-13 End structure of water pipe, water pipe having the same end structure, connection structure between water pipe and connecting body, and method of forming end structure of water pipe
PCT/JP2002/013509 WO2003056227A1 (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structure of water passing tube
CN028260414A CN100406797C (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structu
KR10-2004-7010049A KR20040071251A (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structure of water passing tube
EP02793380A EP1460324A4 (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structure of water passing tube
AU2002360021A AU2002360021A1 (en) 2001-12-25 2002-12-25 End part structure of water passing tube, water passing tube with the end part structure, structure of connection between water passing tube and connection body, and method of forming end part structure of water passing tube
US10/499,836 US7350831B2 (en) 2001-12-25 2004-06-18 End structure of water pipe

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JP2002347705 2002-11-29
JP2002362316A JP4198453B2 (en) 2001-12-26 2002-12-13 End structure of water pipe, water pipe having the same end structure, connection structure between water pipe and connecting body, and method of forming end structure of water pipe

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