JP2004286180A - Branch lead-out joint for same-diameter live pipe - Google Patents

Branch lead-out joint for same-diameter live pipe Download PDF

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Publication number
JP2004286180A
JP2004286180A JP2003081861A JP2003081861A JP2004286180A JP 2004286180 A JP2004286180 A JP 2004286180A JP 2003081861 A JP2003081861 A JP 2003081861A JP 2003081861 A JP2003081861 A JP 2003081861A JP 2004286180 A JP2004286180 A JP 2004286180A
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Japan
Prior art keywords
pipe
branch
saddle
joint
main pipe
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JP2003081861A
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JP4200480B2 (en
Inventor
Takeshi Kato
健 加藤
Shinji Aoki
伸次 青木
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Proterial Ltd
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Hitachi Metals Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B29C65/3428—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding said at least a single wire having a waveform, e.g. a sinusoidal form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5224—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces
    • B29C66/52241—Joining tubular articles for forming fork-shaped connections, e.g. for making Y-shaped pieces with two right angles, e.g. for making T-shaped pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0009—Cutting out
    • B29C2793/0018—Cutting out for making a hole
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch lead-out joint for a same-diameter live pipe, allowing firm fusion of a saddle part to the outer peripheral face of a main pipe without greatly increasing the number of fabricating processes. <P>SOLUTION: The branch lead-out joint 1 for the same-diameter live pipe comprises the saddle part 2 wholly formed of a thermoplastic resin and provided straddling over the main pipe 10, a branch pipe receiving part 3 elongating from the saddle part 2 to the direction of intersecting the pipe axis of the main pipe 10 for receiving a branch pipe having an outer diameter the same as that of the main pipe 10, a drill pipe part 4 in which a cutter 7 for drilling a communication hole 23 is stored at a portion of the main pipe 10 opposite to the branch pipe receiving portion 3, and a heating wire 62 arranged on the inner peripheral face of the saddle portion 2 encircling a void 23. The heating wire 62 consists of a spiral wound portion 65 and a pair of zigzag wound portions 66 connected to it formed sandwiching the void 23 near the peak of the saddle part 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばガスが流通する樹脂製元管からそれと略同等の外径を有する樹脂製分岐管を取り出すために使用される同径活管分岐取り出し用継手に関する。
【０００２】
【従来の技術】
ガス配管等において、地中に埋設され、ガスが流通した状態の樹脂製元管から樹脂製分岐管を簡単に取り出せるようにするために、例えば電気融着式サドル型継手（以下ＥＦサドル型継手という）を元管に装着し、元管の中央部に上下方向に穿孔した穴から水平方向に分岐取り出しすることが行われている（特許文献１参照）。すなわちサドル部の上部に内周面に雌ねじが形成された円筒状本体部を設け、その雌ねじと螺合する雄ねじを有しかつその下部に切刃を有するホルソーを内装したサドル型継手を準備し、樹脂製元管の外周面にサドル型継手を融着した後、このホルソーを操作具で回転させることにより、樹脂製元管の外周面の側部をホルソーで切欠いて埋設元管に対して上下方向から穿孔することにより、樹脂製元管と樹脂製分岐管を連通させた構造とするものである。従来のＥＦサドル型継手は、特許文献１に記載されているように、その取出し口径が元管よりも小さいため、融着面積を比較的大きくすることができる。この広い融着面積と小さい取出し口径により、８０℃の熱水中で圧力を印加する熱間内圧クリープ試験（ＪＩＳ Ｋ ６７７５−３）を行っても、十分な余裕をもって規定値（例えば１０００時間）をクリアーすることが可能であった。しかして、近年、ガス需要量の増加に伴い、ＥＦサドル型継手により、樹脂製元管に対してそれと同等の大きさの樹脂製分岐管を接続し、大流量の分岐取り出しを行うことが要求されている（例えば特許文献２参照）。ＥＦサドル型継手においては、電熱線を螺旋状に巻回すること（特許文献１及び特許文献２参照）や、電熱線を蛇行状に巻回すること（特許文献３参照）が提案されている。
【０００３】
【特許文献１】
特開昭６３−２５４２９６号公報（第２〜３頁、図１、図３）
【特許文献２】
実開平３−１２０８７号公報（第１頁、図１、図３）
【特許文献３】
特開平３−７１８２４号公報（第３頁、図１〜図３）
【０００４】
【発明が解決しようとする課題】
しかし特許文献１及び２に記載された電気融着式サドル型継手は、電熱線を螺旋状に巻回するので、巻線を自動化することができ、継手の製作工数を低減できるが、次のような問題がある。同径活管分岐取り出し用継手においては、分岐管が大口径になった分、融着面積が狭くなり、加えて取り出し口径が大きくなる分だけ分岐管に作用する引張り力も増大するので、融着面に作用する力も大幅に増大し、上述した熱間内圧クリープ試験で規定値をクリアーできないという問題がある。
また真円である分岐管の周囲に同心円状に電熱線を巻回するためには、サドル部を平面に展開した状態で、楕円もしくは長円状に巻線することになる。そのため、短径方向には通電制御を行うために必要な温度検知センサーを設けるスペースが取れない。一方そのスペースを確保するために真円に巻回すると、分岐管直下に電熱線の無い部分が存在し、上記クリープ試験において、熱水が入り込み、分岐管の面積が大きいことと相俟って元管と分岐管との隙間を押し広げ、そこから融着界面に亀裂が進展し、短時間で漏れるという問題が発生する。さらに特許文献３に記載の如く電熱線を蛇行状に巻回することは、手動で巻線を行う必要があるので、継手の製作工数が大幅に増大し、実用的でない。
【０００５】
従って本発明の目的は、従来の電気融着式分岐取り出し用継手の問題点を解決し、継手の製作工数の大幅な増大を伴わずに、サドル部を元管の外周面に強固に融着することが可能な同径活管分岐取り出し用継手を提供することである。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、本発明の同径活管分岐取り出し用継手は、全体が熱可塑性樹脂で形成され、元管に跨設されるサドル部と、前記サドル部から前記元管の管軸と交叉する方向に伸長し、前記元管と同等の外径を有する分岐管を受取る分岐管受容部と、前記元管の前記分岐管受容部と対向する部位に空孔を穿孔するカッターが収容される穿孔管部と、前記サドル部の内周面に前記空孔を取り囲んで配設された電熱線を有する同径活管分岐取り出し用継手において、前記電熱線は、螺旋状の巻線部とそれに連なり前記サドル部の頂部付近に前記空孔を挟んで形成された一対の葛折り状の巻線部からなるという構成を有するものである。
本発明によれば、分岐管の口径が元管の口径と同等であっても、融着面積を大きくすることができるとともに、分岐管直下における電熱線の無い部分が少なくなり、融着界面の亀裂を防止することができる。そのため、長期にわたって継手の信頼性を向上することが可能となる。また巻線部のうち螺旋巻部の形成工程は、自動化できるので、継手の製作工数の増加もわずかである。
【０００７】
本発明において、前記葛折り状の巻線部は、前記空孔と前記螺旋状の巻線部との間に形成されかつ前記空孔に向かって段階的に巻線部の長さが短くなるように折り曲げられているか、又は前記葛折り状の巻線部は、前記螺旋状の巻線部の外周側に形成されかつ前記外周側に向かって段階的に巻線部の長さが短くなるように折り曲げられていることが好ましい。これにより、螺旋状の巻線部の内周側又は外周側には、略扇型状の巻線部が付加されるので、分岐管直下における電熱線が存在しない部分が極めて少なくなり、融着界面の亀裂をより確実に防止することができる。
【０００８】
本発明において、前記電熱線は、サドル部の内周面に直接巻付けることも可能であるが、製作工数を短縮するために、熱可塑性樹脂からなる樹脂シートの表面に形成され、その樹脂シートは、前記サドル部の内周面に固定されていることが好ましい。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。図１は本発明の実施の形態に係わる分岐取り出し用継手の断面図、図２は図１の継手に装着されるインナーを展開した平面図、図３はインナーの他の例を示す平面図、図４は図１の分岐取り出し用継手が元管に装着された状態を示す、継手の一部を破断した斜視図である。
【００１０】
図１において、１は地中に埋設された元管（不図示）の側部に装着される分岐取り出し用継手（以下分岐継手という）である。分岐継手１は、元管と同一又は同系統の熱可塑性樹脂（例えばポリエチレンに代表されるポレオレフィン系樹脂）で形成され、内周面が元管の外周面に密着するような曲率半径を有する、Ｃ字状のサドル部２と、元管１０の軸心Ｘと直交する軸心Ｚをもち、分岐管（不図示）が接続される分岐管受容部３と、元管の穿孔手段が収容される穿孔管部４と、穿孔管部４の軸心Ｙと同軸に形成された上側管部５を有する。サドル部２は、円弧状の断面形状を有する基体部２１と、その円周方向の両端部において半径方向に突出する脚部２２を含む。穿孔管部４の内部には、上端部に穴部（例えば６角穴）７１を有するねじシャフト７０がねじ込まれた穿孔カッター７が収容され、また穿孔管部４の下端部には、キャップ４１が例えばバット融着により固着されて、下端面が密閉されている。上側管部５には、ねじシャフト７０に連結される駆動シャフト（不図示）を案内する案内溝８１を有するリング状のガイド部材８が螺合されかつ上端面がねじキャップ９で密閉されている。元管１０の軸心Ｘ方向に沿って基体部２１の両端部には、継手を元管に接合する円弧状断面を有する融着部２４が形成されている。
【００１１】
上記融着部２４は、サドル部２の内周面に直接巻線を施すことにより形成することが可能であるが、巻線に要する工数を考慮すると、例えば図２又は図３に示す中空円板状のシート状部材を準備しておき、その部材をサドル部２の内周面に固定することが好ましい。図２に示すインナー６は、例えば熱可塑性樹脂で形成された絶縁性基板６１とその一方の面に巻回された電熱線６２を有する。電熱線６２は長円形の空孔６３の周囲に絶縁性基板６１の外周側から内周側に螺旋状に巻回された螺旋巻部６５とその内周側でかつ軸心Ｘ方向と交叉するように折り返すことにより葛折り状に巻回された葛折巻線部６６を含む。葛折巻線部６６は、角度α（例えば９０度）の範囲で空孔に向かって段階的に巻線部の長さが短くなるように折り返されて形成された、略扇形形状の巻線部である。電熱線６２の巻き始めは端子６４に係止され、またその巻き終わりは螺旋巻部６５の外周側に設けられた端子６７に係止されている。
【００１２】
図３に示すインナー６は、上記と同様に絶縁性基板６１とその一方の面に巻回された電熱線６２を有する。この電熱線６２は、軸心Ｘ方向と交叉するように葛折り状に折り返すことにより形成された葛折巻線部６６とその内周側でかつ長円形の空孔６３の周囲に螺旋状に巻回された螺旋巻部６５とその外周側に葛折り状に巻回された葛折巻線部６６を含む。葛折巻線部６６は、角度β（例えば１０８度）の範囲で絶縁性基板６１の外周部に向かって段階的に巻線部の長さが短くなるように折り返されて形成された、略扇形形状の巻線部である。電熱線６２の巻き始めは端子６４に係止され、またその巻き終わりは螺旋巻部６５の外周側に設けられた端子６７に係止されている。なお、正確な巻線を行うために、図示しないが、絶縁性基板６１の表面に所定の巻線形状に沿って電熱線を案内する複数の突起を設けておくことが好ましい。
【００１３】
上記インナー６は、成形用金型内にインサートされ、熱可塑性樹脂を用いてサドル部２を含む分岐継手１を射出成形することにより、サドル部２の内周面に固定される。
【００１４】
上記の分岐継手１によれば、例えば次に示すような手順で元管からそれと同径の分岐管の取り出しを行うことができる。元管１０の側方に、分岐継手１を配置し、例えば分岐継手１の脚部２２にフック（不図示）を係止し、このフックを図面左側に引張り、融着部２４の内周面全体が元管１０に当接するまで分岐継手１を元管１０に向かって押し込む。ここで基体部２１は弾性変形して上下方向に開き、更に融着部２４の内周面全体が元管１０に当接すると、脚部２２の存在により基体部２１にはそれを閉じる方向の力が作用するので、図４に示すようにサドル部２が元管１０に密着する。次にコネクターピン２５に電圧源（不図示）を接続して電熱線６に通電することにより継手１を元管１０に融着固定する。この融着工程において、融着部２４には螺旋巻部６５の内周側（図２参照）または外周側（図３参照）にも葛折巻線部６６が形成されているので、融着部２４の略全面が加熱溶融し、大きな融着面積が得られる。従って熱間内圧クリープ試験で規定値を十分クリアーすることができる。
【００１５】
融着が完了すると、インジケータ２６が上昇して、これを目視で確認することができる。その後分岐管（不図示）が分岐管受容部３に接続される。最後に、ガイド部材８のガイド穴８１から駆動シャフト（不図示）を差し込み、穿孔管部４に装入されたねじシャフト７０の穴部７１に駆動シャフト（不図示）の先端（例えば６角形の断面形状を有する）を係止し、カッター７を回転させることにより、元管１０の側面に穿孔し、穿孔後カッター７を上記と反対方向に回転させて元の位置に戻した後、上側管部５の上端面にキャップ９を被せて密閉する。
【００１６】
図１に示す分岐継手１によれば、元管１０の分岐管受容部４と対向する部位を穿孔するカッター７が収容される穿孔管部４が、この穿孔口よりも下方に形成されるので、サドル部２１から地表に向かって突出する部分（上側管部５）の高さを抑えることができる。そのため、元管１０が浅く埋設された状態でも、分岐取り出し配管を行うことが可能となる。
【００１７】
【発明の効果】
以上に記述の如く、本発明によれば、分岐管の口径が元管の口径と同等であっても、融着面積を大きくすることができるとともに、分岐管直下における電熱線の無い部分が少なくなり、融着界面の亀裂を防止することができる。そのため、長期にわたって継手の信頼性を向上することが可能となる。また葛折り状の巻線部は手動で巻線を行うが、螺旋状巻線部の形成は自動化できるので、従来の巻線よりも製作工数を低減できる。本発明は、小口径（呼び径：５０Ａ〜７５Ａ）の元管からの分岐取り出し配管に特に有効に適用される。
【図面の簡単な説明】
【図１】本発明の実施の形態に係わる分岐取り出し用継手の断面図である。
【図２】図１の分岐取り出し用継手に装着されるインナーを展開した平面図である。
【図３】インナーの他の例を示す平面図である。
【図４】図１に示す分岐取り出し用継手が元管に装着された状態を示す、その一部を破断した斜視図である。
【符号の説明】
１：分岐取り出し用継手
２：サドル部
２１：基体部、２２：脚部、２４：融着部、２５：コネクターピン、２６：インジケータ
３：分岐管受容部
４：穿孔管部
４１：キャップ
５：上側管部
６：インナー
６１：基板、６２：電熱線、６３：空孔、６４、６７：端子、６５：螺旋巻部
６６：葛折巻線部
７：カッター
７０：ねじシャフト、７１：穴部
８：ガイド部材
８１：ガイド穴
９：ねじキャップ
１０：元管[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to, for example, a joint for taking out a branch pipe having the same diameter, which is used to take out a resin branch pipe having an outer diameter substantially equivalent to that of a resin base pipe through which gas flows.
[0002]
[Prior art]
In a gas pipe or the like, for example, an electric fusion type saddle type joint (hereinafter referred to as an EF saddle type joint) can be easily taken out from a resin main pipe buried underground and in a state where gas flows therethrough. (Referred to as Patent Document 1). The main pipe is attached to a main pipe, and is horizontally taken out from a vertically drilled hole in the center of the main pipe. That is, a saddle-type joint having a cylindrical body with an internal thread formed on the inner peripheral surface at the upper part of the saddle part, having a male thread to be screwed with the female thread, and a forsaw having a cutting edge at the lower part is prepared. After welding the saddle-type joint to the outer peripheral surface of the resin-made main pipe, the side of the outer peripheral surface of the resin-made main pipe is cut out with a forsaw by rotating this forsaw with an operating tool, and the buried original pipe is cut off. The structure is such that a resin-made main pipe and a resin-made branch pipe are communicated with each other by drilling from the vertical direction. As described in Patent Literature 1, the conventional EF saddle-type joint has a smaller outlet diameter than the main pipe, so that the fusion area can be relatively large. Due to this large fusion area and small outlet diameter, even if a hot internal pressure creep test (JIS K 6775-3) is applied in which hot water is applied at 80 ° C., a specified value (for example, 1000 hours) with a sufficient margin is provided. Was able to be cleared. In recent years, as the demand for gas has increased, it has been required to connect a resin branch pipe of the same size to the resin base pipe by means of an EF saddle type joint, and to perform branch discharge at a large flow rate. (For example, see Patent Document 2). In an EF saddle type joint, it has been proposed to spirally heat a heating wire (see Patent Documents 1 and 2) or to wind a heating wire in a meandering shape (see Patent Document 3). .
[0003]
[Patent Document 1]
JP-A-63-254296 (pages 2-3, FIGS. 1 and 3)
[Patent Document 2]
Japanese Utility Model Laid-Open No. 3-12087 (Page 1, FIG. 1, FIG. 3)
[Patent Document 3]
JP-A-3-71824 (page 3, FIGS. 1 to 3)
[0004]
[Problems to be solved by the invention]
However, the electrofusion saddle type joint described in Patent Documents 1 and 2 winds a heating wire helically, so that the winding can be automated and the number of manufacturing steps of the joint can be reduced. There is such a problem. In the case of a joint for taking out an active pipe branch of the same diameter, the larger the diameter of the branch pipe, the smaller the fusion area, and the larger the diameter of the outlet pipe, the greater the tensile force acting on the branch pipe. There is also a problem that the force acting on the surface is greatly increased, and the specified value cannot be cleared in the above-described hot internal pressure creep test.
Further, in order to wind the heating wire concentrically around the branch pipe which is a perfect circle, the heating wire is wound in an elliptical or elliptical shape with the saddle part developed in a plane. For this reason, there is no space in the minor axis direction for providing a temperature detection sensor necessary for controlling the energization. On the other hand, when winding in a perfect circle to secure the space, there is a portion without a heating wire immediately below the branch pipe, and in the above creep test, hot water enters and coupled with the large area of the branch pipe. There is a problem that a gap between the main pipe and the branch pipe is pushed and widened, from which a crack propagates to the fusion interface and leaks in a short time. Furthermore, winding a heating wire in a meandering shape as described in Patent Document 3 requires manual winding, which significantly increases the number of manufacturing steps of the joint and is not practical.
[0005]
Accordingly, an object of the present invention is to solve the problems of the conventional electrofusion type joint for branching out, and to securely fuse the saddle portion to the outer peripheral surface of the main pipe without significantly increasing the number of manufacturing steps of the joint. It is to provide a joint for taking out a branch of the same diameter active pipe that can perform the same.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the same-diameter active pipe branch taking-out joint of the present invention is entirely formed of a thermoplastic resin, and has a saddle portion straddling the main pipe, and a pipe extending from the saddle section to the main pipe. A branch pipe receiving portion that extends in a direction intersecting the axis and receives a branch pipe having an outer diameter equal to that of the main pipe, and a cutter that punches a hole in a portion of the main pipe facing the branch pipe receiving section. In a perforated pipe portion to be accommodated and a joint for taking out an active-tube branch having the same diameter as the heating wire disposed so as to surround the hole on the inner peripheral surface of the saddle portion, the heating wire is a spiral winding. And a pair of helical windings formed in the vicinity of the top of the saddle part and sandwiching the hole.
According to the present invention, even when the diameter of the branch pipe is equal to the diameter of the main pipe, the fusion area can be increased, and the portion without a heating wire immediately below the branch pipe is reduced, and the fusion interface Cracks can be prevented. Therefore, it is possible to improve the reliability of the joint over a long period of time. In addition, since the process of forming the spiral winding portion of the winding portion can be automated, the number of manufacturing steps of the joint is slightly increased.
[0007]
In the present invention, the winding portion is formed between the hole and the spiral winding portion, and the length of the winding portion is gradually reduced toward the hole. Or the bent winding part is formed on the outer peripheral side of the spiral winding part and the length of the winding part is gradually reduced toward the outer peripheral side. It is preferable that it is bent as follows. As a result, a substantially fan-shaped winding portion is added to the inner circumferential side or outer circumferential side of the spiral winding portion. The crack at the interface can be more reliably prevented.
[0008]
In the present invention, the heating wire can be directly wound around the inner peripheral surface of the saddle portion.However, in order to reduce the number of manufacturing steps, the heating wire is formed on the surface of a resin sheet made of a thermoplastic resin. Is preferably fixed to the inner peripheral surface of the saddle portion.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of a joint for branching and taking out according to an embodiment of the present invention, FIG. 2 is a developed plan view of an inner attached to the joint of FIG. 1, FIG. 3 is a plan view showing another example of the inner, FIG. 4 is a partially broken perspective view showing a state in which the branch take-out joint of FIG. 1 is attached to a main pipe.
[0010]
In FIG. 1, reference numeral 1 denotes a branch joint (hereinafter referred to as a branch joint) mounted on a side of a main pipe (not shown) buried underground. The branch joint 1 is formed of the same or the same type of thermoplastic resin as the main pipe (for example, a polyolefin resin represented by polyethylene), and has a radius of curvature such that the inner peripheral surface is in close contact with the outer peripheral surface of the main pipe. , A C-shaped saddle portion 2, an axis Z orthogonal to the axis X of the main pipe 10, a branch pipe receiving section 3 to which a branch pipe (not shown) is connected, and a main pipe piercing means. And an upper tube 5 formed coaxially with the axis Y of the perforated tube 4. The saddle portion 2 includes a base portion 21 having an arc-shaped cross-sectional shape, and leg portions 22 protruding in the radial direction at both ends in the circumferential direction. Inside the perforated tube 4, a perforated cutter 7 into which a screw shaft 70 having a hole (for example, a hexagonal hole) 71 at the upper end is screwed is accommodated. Is fixed by, for example, butt fusion, and the lower end surface is sealed. A ring-shaped guide member 8 having a guide groove 81 for guiding a drive shaft (not shown) connected to the screw shaft 70 is screwed into the upper tube portion 5, and the upper end surface is sealed with a screw cap 9. . At both ends of the base portion 21 along the axis X direction of the main pipe 10, fusion parts 24 having an arc-shaped cross section for joining a joint to the main pipe are formed.
[0011]
The fused portion 24 can be formed by directly applying a winding to the inner peripheral surface of the saddle portion 2. However, in consideration of the man-hour required for the winding, for example, a hollow circle shown in FIG. 2 or FIG. It is preferable that a plate-like sheet member is prepared and the member is fixed to the inner peripheral surface of the saddle portion 2. The inner 6 shown in FIG. 2 has an insulating substrate 61 made of, for example, a thermoplastic resin and a heating wire 62 wound on one surface thereof. The heating wire 62 is spirally wound around the oval hole 63 from the outer peripheral side to the inner peripheral side of the insulating substrate 61, intersects the inner peripheral side thereof and the axis X direction. Winding portion 66 wound in a zigzag shape by folding back in this manner. The winding part 66 has a substantially fan-shaped winding formed by folding back the winding part in a stepwise manner toward the hole within the range of the angle α (for example, 90 degrees). Department. The winding start of the heating wire 62 is locked by the terminal 64, and the winding end is locked by the terminal 67 provided on the outer peripheral side of the spiral winding portion 65.
[0012]
The inner 6 shown in FIG. 3 has an insulating substrate 61 and a heating wire 62 wound on one surface of the insulating substrate 61 as described above. The heating wire 62 is spirally formed around a skewed winding portion 66 formed by folding back in a zigzag manner so as to intersect with the axis X direction and an inner peripheral side of the oval hole 63. It includes a spirally wound part 65 and a winding part 66 wound around the outer periphery thereof. The winding part 66 is formed by being folded back so that the length of the winding part is gradually reduced toward the outer peripheral part of the insulating substrate 61 within a range of an angle β (for example, 108 degrees). This is a fan-shaped winding part. The winding start of the heating wire 62 is locked by the terminal 64, and the winding end is locked by the terminal 67 provided on the outer peripheral side of the spiral winding portion 65. Although not shown, it is preferable to provide a plurality of protrusions for guiding the heating wire along a predetermined winding shape on the surface of the insulating substrate 61 in order to perform accurate winding.
[0013]
The inner 6 is inserted into a molding die, and is fixed to the inner peripheral surface of the saddle portion 2 by injection molding the branch joint 1 including the saddle portion 2 using a thermoplastic resin.
[0014]
According to the branch joint 1 described above, a branch pipe having the same diameter as the main pipe can be taken out from the main pipe in the following procedure, for example. The branch joint 1 is arranged on the side of the main pipe 10, for example, a hook (not shown) is locked to the leg 22 of the branch joint 1, and the hook is pulled to the left side in the drawing, and the inner peripheral surface of the fusion portion 24 The branch joint 1 is pushed toward the main pipe 10 until the whole comes into contact with the main pipe 10. Here, the base portion 21 is elastically deformed and opens in the vertical direction. Further, when the entire inner peripheral surface of the fusion portion 24 abuts on the base tube 10, the base portion 21 is provided in the closing direction by the presence of the leg portion 22. Since the force acts, the saddle portion 2 comes into close contact with the main pipe 10 as shown in FIG. Next, a voltage source (not shown) is connected to the connector pin 25, and the heating wire 6 is energized to fuse and fix the joint 1 to the main pipe 10. In this fusing step, the winding part 66 is formed on the inner peripheral side (see FIG. 2) or the outer peripheral side (see FIG. 3) of the spiral winding part 65 in the fusing part 24. Substantially the entire surface of the portion 24 is heated and melted, and a large fused area is obtained. Therefore, the prescribed value can be sufficiently cleared by the hot internal pressure creep test.
[0015]
When the fusion is completed, the indicator 26 rises, and this can be visually confirmed. Thereafter, a branch pipe (not shown) is connected to the branch pipe receiving portion 3. Finally, a drive shaft (not shown) is inserted from the guide hole 81 of the guide member 8, and the tip (for example, hexagonal shape) of the drive shaft (not shown) is inserted into the hole 71 of the screw shaft 70 inserted into the perforated tube 4. (Having a cross-sectional shape), and by rotating the cutter 7, a hole is pierced in the side surface of the original pipe 10. After piercing, the cutter 7 is rotated in the opposite direction to the above position to return to the original position. The upper end surface of the part 5 is covered with a cap 9 and sealed.
[0016]
According to the branch joint 1 shown in FIG. 1, the perforated pipe portion 4 in which the cutter 7 for perforating the portion of the main pipe 10 facing the branch pipe receiving portion 4 is formed below the perforation opening. The height of the portion (upper tube portion 5) protruding from the saddle portion 21 toward the surface of the ground can be suppressed. Therefore, even in a state where the main pipe 10 is buried shallowly, it is possible to perform branch extraction pipe.
[0017]
【The invention's effect】
As described above, according to the present invention, even when the diameter of the branch pipe is equal to the diameter of the main pipe, the fusion area can be increased, and the portion having no heating wire directly below the branch pipe is reduced. Thus, cracks at the fusion interface can be prevented. Therefore, it is possible to improve the reliability of the joint over a long period of time. In addition, although the winding of the spiral winding is manually wound, the formation of the spiral winding can be automated, so that the number of manufacturing steps can be reduced as compared with the conventional winding. INDUSTRIAL APPLICABILITY The present invention is particularly effectively applied to a branch taking-out pipe from a small-diameter (nominal diameter: 50A to 75A) main pipe.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a branch take-out joint according to an embodiment of the present invention.
FIG. 2 is a developed plan view of an inner attached to the branch take-out joint of FIG. 1;
FIG. 3 is a plan view showing another example of the inner.
FIG. 4 is a partially broken perspective view showing a state where the branch take-out joint shown in FIG. 1 is attached to a main pipe.
[Explanation of symbols]
1: Joint for branch removal 2: Saddle part 21: Base part, 22: Leg part, 24: Fused part, 25: Connector pin, 26: Indicator 3: Branch pipe receiving part 4: Perforated pipe part 41: Cap 5: Upper tube part 6: inner 61: substrate, 62: heating wire, 63: hole, 64, 67: terminal, 65: spiral winding part 66: kaori winding part 7: cutter 70: screw shaft, 71: hole part 8: Guide member 81: Guide hole 9: Screw cap 10: Main pipe

Claims (4)

全体が熱可塑性樹脂で形成され、元管に跨設されるサドル部と、前記サドル部から前記元管の管軸と交叉する方向に伸長し、前記元管と同等の外径を有する分岐管を受取る分岐管受容部と、前記元管の前記分岐管受容部と対向する部位に空孔を穿孔するカッターが収容される穿孔管部と、前記サドル部の内周面に前記空孔を取り囲んで配設された電熱線を有する同径活管分岐取り出し用継手において、前記電熱線は、螺旋状の巻線部とそれに連なり前記サドル部の頂部付近に前記空孔を挟んで形成された一対の葛折り状の巻線部からなることを特徴とする同径活管分岐取り出し用継手。A saddle portion entirely formed of a thermoplastic resin, and a saddle portion straddling the main tube, and a branch pipe extending from the saddle portion in a direction intersecting the pipe axis of the main tube and having an outer diameter equivalent to that of the main tube. Pipe receiving section, a perforated pipe section in which a cutter for perforating a hole is housed in a portion of the main pipe facing the branch pipe receiving section, and an inner peripheral surface of the saddle section surrounding the hole. In the same diameter active tube branch taking-out joint having a heating wire disposed in the above, the heating wire is a spiral winding portion and a pair formed so as to be continuous with it and formed near the top of the saddle portion with the hole interposed therebetween. A joint for taking out an active pipe branch having the same diameter, characterized by comprising a winding portion having a crimped shape. 前記葛折り状の巻線部は、前記空孔と前記螺旋状の巻線部との間に形成されかつ前記空孔に向かって段階的に巻線部の長さが短くなるように折り曲げられていることを特徴とする請求項１記載の同径活管分岐取り出し用継手。The crooked winding portion is formed between the hole and the helical winding portion and is bent so as to gradually decrease the length of the winding portion toward the hole. The joint for taking out a branch of the same-diameter live pipe according to claim 1, characterized in that: 前記葛折り状の巻線部は、前記螺旋状の巻線部の外周側に形成されかつ前記外周側に向かって段階的に巻線部の長さが短くなるように折り曲げられていることを特徴とする請求項１記載の同径活管分岐取り出し用継手。The crimped winding portion is formed on the outer peripheral side of the spiral winding portion, and is bent so as to gradually reduce the length of the winding portion toward the outer peripheral side. The joint for taking out an equal-diameter active pipe branch according to claim 1, characterized in that: 前記電熱線は、熱可塑性樹脂からなる樹脂シートの表面に形成され、その樹脂シートは、前記サドル部の内周面に固定されていることを特徴とする請求項１記載の同径活管分岐取り出し用継手。The same-diameter active pipe branch according to claim 1, wherein the heating wire is formed on a surface of a resin sheet made of a thermoplastic resin, and the resin sheet is fixed to an inner peripheral surface of the saddle portion. Removal joint.
JP2003081861A 2003-03-25 2003-03-25 Fitting for taking out the same diameter live pipe Expired - Lifetime JP4200480B2 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006258256A (en) * 2005-03-18 2006-09-28 Tokyo Gas Co Ltd Removal method for branched pipe made of resin
JP2007085432A (en) * 2005-09-21 2007-04-05 Hitachi Metals Ltd Joint for branching same-diameter active pipe
JP2007154945A (en) * 2005-12-02 2007-06-21 Hitachi Metals Ltd Electrically-fused joint for taking out branch
JP2012102833A (en) * 2010-11-12 2012-05-31 Kubota-Ci Co Fusion inner and branch saddle joint using the same
JP2013100878A (en) * 2011-11-09 2013-05-23 Kubota-Ci Co Fusion inner and branch saddle joint using the same
JP2015172438A (en) * 2015-04-30 2015-10-01 クボタシーアイ株式会社 Manufacturing method of fusion inner and manufacturing method of branch saddle joint
EP3392025A1 (en) * 2017-04-20 2018-10-24 Georg Fischer Wavin AG Heating element geometry for use in a pipe saddle

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006258256A (en) * 2005-03-18 2006-09-28 Tokyo Gas Co Ltd Removal method for branched pipe made of resin
JP4514047B2 (en) * 2005-03-18 2010-07-28 東京瓦斯株式会社 Removal method of resin branch pipe
JP2007085432A (en) * 2005-09-21 2007-04-05 Hitachi Metals Ltd Joint for branching same-diameter active pipe
JP2007154945A (en) * 2005-12-02 2007-06-21 Hitachi Metals Ltd Electrically-fused joint for taking out branch
JP2012102833A (en) * 2010-11-12 2012-05-31 Kubota-Ci Co Fusion inner and branch saddle joint using the same
JP2013100878A (en) * 2011-11-09 2013-05-23 Kubota-Ci Co Fusion inner and branch saddle joint using the same
JP2015172438A (en) * 2015-04-30 2015-10-01 クボタシーアイ株式会社 Manufacturing method of fusion inner and manufacturing method of branch saddle joint
EP3392025A1 (en) * 2017-04-20 2018-10-24 Georg Fischer Wavin AG Heating element geometry for use in a pipe saddle
US10697574B2 (en) 2017-04-20 2020-06-30 Georg Fischer Wavin Ag Heating element geometry for use in a tapping saddle

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