JP6529287B2 - Electric fusion type pipe fitting - Google Patents
Electric fusion type pipe fitting Download PDFInfo
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- JP6529287B2 JP6529287B2 JP2015047041A JP2015047041A JP6529287B2 JP 6529287 B2 JP6529287 B2 JP 6529287B2 JP 2015047041 A JP2015047041 A JP 2015047041A JP 2015047041 A JP2015047041 A JP 2015047041A JP 6529287 B2 JP6529287 B2 JP 6529287B2
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- 230000004927 fusion Effects 0.000 title claims description 86
- 239000011347 resin Substances 0.000 claims description 53
- 229920005989 resin Polymers 0.000 claims description 53
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000003780 insertion Methods 0.000 claims description 25
- 230000037431 insertion Effects 0.000 claims description 25
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 description 6
- -1 polyethylene Polymers 0.000 description 6
- 229920000573 polyethylene Polymers 0.000 description 6
- 230000007774 longterm Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 230000020169 heat generation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000012447 hatching Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Description
この発明は、ガス供給用の埋設配管などの樹脂配管に使用される分岐取出し用のサドル形の電気融着式管継手に関する。 BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a saddle-shaped electric fusion type pipe joint for branch extraction used for resin piping such as buried piping for gas supply.
従来から、ガスなどの流体が流動する地中に埋設された樹脂製本管から分岐配管を取り出すために、図６に示すような樹脂製本管に跨って融着される鞍形のサドル部を有する電気融着式管継手が使用されている。この種のサドル形の電気融着式管継手は、サドル部と樹脂製本管との間に十分な接合強度が必要であるので必要な強度に応じた大きさの融着面積が必要となる。図６に示される電気融着式管継手において、分岐部（１３）の外径が樹脂製本管（４）に対して比較的小径である場合にはサドル部（１２）に広い融着面積を設けることができるが、分岐部（１３）の外径が樹脂製本管（４）とほぼ同径であるような場合には、サドル部（１２）に十分な融着面積を確保できない場合がある。そのため、特許文献１には、樹脂製本管（４）との十分な融着面積を確保するために、サドル部（１３）を樹脂製本管の周方向に沿って延長する延長部（１４）を設け、サドル部座面を拡張することが提案されている。ここで各部に付している符号は、特許文献１に記載された符号を使用している。 Conventionally, in order to take out a branch pipe from a resin main pipe embedded in the ground where a fluid such as gas flows, it has a wedge-shaped saddle portion fused across the resin main pipe as shown in FIG. Electrical fusion fittings are used. In this type of saddle-shaped electric fusion type pipe joint, a sufficient bonding strength is required between the saddle portion and the resin main pipe, so a fusion area having a size corresponding to the necessary strength is required. In the electric fusion type pipe joint shown in FIG. 6, when the outer diameter of the branch portion (13) is relatively small with respect to the resin main pipe (4), a large fusion area is formed on the saddle portion (12). Although it can be provided, if the outer diameter of the branch portion (13) is almost the same diameter as the resin main pipe (4), a sufficient fusion area may not be secured in the saddle portion (12) in some cases. . Therefore, in patent document 1, in order to secure a sufficient fusion area with the resin main pipe (4), an extension part (14) which extends the saddle part (13) along the circumferential direction of the resin main pipe It is proposed to provide and extend the saddle seat surface. The reference numerals given to each part here use the reference numerals described in Patent Document 1.
特許文献１に記載の電気融着式管継手によれば、サドル部座面が拡張される以前の電気融着式管継手に対して融着面積を広く確保することができるので、融着強度を増加させることができる。 According to the electric fusion type pipe joint described in Patent Document 1, it is possible to secure a large fusion area with respect to the electric fusion type pipe joint before the seat surface of the saddle portion is expanded. Can be increased.
しかし、特許文献１に記載の電気融着式管継手では分岐部に対して直角方向（図６における樹脂製本管の側面方向）に対する接合強度は増加するものの、分岐部に沿った方向に対する接合強度には改善の余地が残る。電気融着式管継手では、長期クリープ性能の評価試験として、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）の試験を行い、割れその他の欠陥を生じないことが必要になるが、大口径の分岐部を有する電気融着式管継手における熱間内圧クリープ試験において分岐部の付け根（図６における樹脂製本管の上方）の融着箇所で十分な接合強度が得られないおそれがある。 However, in the electric fusion type pipe joint described in Patent Document 1, although the joint strength in the direction perpendicular to the branch (the side direction of the resin main pipe in FIG. 6) is increased, the joint strength in the direction along the branch There is still room for improvement. In the electric fusion type pipe joint, as an evaluation test of long-term creep performance, a test of a hot internal pressure creep test (JIS K 6775-3) in which pressure is applied in hot water of 80 ° C. is performed to cause cracks and other defects. Although it is not necessary, in the hot internal pressure creep test in an electric fusion type pipe joint having a large diameter branch part, sufficient bonding is achieved at the welding point of the root of the branch part (above the resin main pipe in FIG. 6). There is a possibility that strength can not be obtained.
本発明は、これらの問題点に鑑みてなされたものであり、樹脂製本管に対して比較的大口径の分岐を取り出すことが可能でありながら、さらに長期クリープ性能を満足する分岐取出し用のサドル形の電気融着式管継手を提供することを目的とする。 The present invention has been made in view of these problems, and it is possible to take out a branch with a relatively large diameter from a resin main pipe, yet, a saddle for a take-out extraction that satisfies long-term creep performance. It is an object of the present invention to provide an electric fusion type pipe joint of a shape.
上記の目的を達成するために、本発明の電気融着式管継手は、
樹脂製本管に跨って内面が密着するように装着され、前記内面付近に電熱線が埋設された鞍形のサドル部と、前記サドル部から前記樹脂製本管と逆方向に突出する分岐部と、前記分岐部の端部から前記サドル部の内面に向かって貫通する中空部と、を備える電気融着式管継手であって、
前記サドル部には、前記分岐部の軸線方向に前記電熱線と所定の間隔を隔てられ、前記電熱線によって溶融しない位置に掘り込まれた溝部が形成され、
前記溝部を埋める挿入片が、前記溝部と溶融接合されることなく前記溝部に挿入されていることを特徴とするものである。
この電気融着式管継手によれば、サドル部に、樹脂製本管の軸線と平行かつ分岐部と直交する方向に掘り込まれた溝部を備えるので分岐部の軸線方向への引っ張り応力に対するサドル部の強度が低下する。よって、継手の内部に圧力がかかり分岐部に引っ張り応力が作用した際には、サドル部が溝部の溝底部を起点として変形しやすくなる。そのため、樹脂製本管とサドル内面の融着箇所へ伝わる引張応力が緩和され、融着箇所における割れや亀裂の発生を防ぐことができる。
また、この電気融着式管継手では溝部挿入された挿入片で融着時の圧縮応力を受けることができるので、溝部の箇所でのサドル部の変形を防止して融着に必要な界面圧力を得ることができる。よって、本発明の電気融着式管継手によれば、樹脂製本管とサドル内面との間で十分な融着強度が得られる。
In order to achieve the above object, the electric fusion joint of the present invention is
A saddle-shaped saddle portion mounted so that the inner surface is in close contact across the resin main pipe, and a heating wire is embedded in the vicinity of the inner surface, and a branch portion projecting from the saddle portion in the opposite direction to the resin main pipe. And a hollow portion penetrating from an end of the branch portion toward an inner surface of the saddle portion.
The saddle portion is formed with a groove portion which is separated from the heating wire by a predetermined distance in the axial direction of the branch portion, and is dug into a position not melted by the heating wire.
The insert piece filling the groove is inserted into the groove without being fusion-bonded to the groove .
According to this electric fusion type pipe joint, since the saddle portion is provided with the groove portion dug in the direction parallel to the axis of the resin main pipe and orthogonal to the branch portion, the saddle portion against the tensile stress in the axial direction of the branch portion The strength of the Therefore, when pressure is applied to the inside of the joint and tensile stress is applied to the branch portion, the saddle portion is easily deformed starting from the groove bottom portion of the groove portion. Therefore, the tensile stress transmitted to the fusion bonding portion between the resin main pipe and the inner surface of the saddle can be relaxed, and the occurrence of cracking or cracking at the fusion bonding portion can be prevented.
Further, in this electric fusion type pipe joint, since the insertion piece inserted in the groove can receive the compressive stress at the time of fusion, the deformation of the saddle portion at the location of the groove is prevented and the interface pressure necessary for the fusion is obtained. You can get Therefore, according to the electric fusion type pipe joint of the present invention, sufficient fusion bonding strength can be obtained between the resin main pipe and the inner surface of the saddle.
また、本発明の電気融着式管継手において、前記電熱線は、前記中空部の周りに複数条にわたって巻回され、
前記溝部は、巻回された前記電熱線の前記中空部の側の内側の２巻の位置よりも外側の位置に溝底部の位置がくるように形成されていることが好ましい。
このようにすることで、継手の内部に圧力が加わった際の、融着接合部端部に加わる引張応力を緩和する効果をより高めることができる。
Further, in the electric fusion joint according to the present invention, the heating wire is wound around the hollow portion over a plurality of strips,
The groove is preferably formed in such a manner that the position of the groove bottom portion at a position outside the position of the two volumes of the inner side of the hollow portion of the wound the heating wire.
In this way, the effect of alleviating the tensile stress applied to the end of the fusion bonding when the pressure is applied to the inside of the joint can be further enhanced.
また、本発明の電気融着式管継手において、前記挿入片は、表面が鋸刃状に形成され、前記溝部に圧入して挿入されていることが好ましい。
このようにすることで、溝部から挿入片が容易に脱落することがないようにすることができ、挿入片脱落による融着性能悪化を予防することができる。さらに、前記挿入片は、前記溝部の入口に融着され固定されることで、挿入片の脱落をより確実に防止することができる。
Further, in the electric fusion type pipe joint of the present invention, it is preferable that a surface of the insertion piece is formed in a sawtooth shape, and the insertion piece is inserted into the groove by press-fitting.
By doing so, the insertion piece can be prevented from easily falling off from the groove, and deterioration of the fusion performance due to the insertion piece falling off can be prevented. Furthermore, the insertion piece can be more reliably prevented from falling off by being fused and fixed to the inlet of the groove.
本発明の電気融着式管継手によれば、樹脂製本管の軸線と平行かつ分岐部の軸線と直交する方向にサドル部に掘り込まれた溝部と、その溝部に挿入された挿入片を備えるので、融着時には電気融着式管継手と樹脂製本管の間の融着界面に融着接合に十分な界面圧力を生じさせることができると共に、長期クリープ性能評価においては融着箇所へ加わる引張応力を緩和することができる。その結果、特に大口径の分岐取り出し用のサドル形の電気融着式管継手において、十分な融着性能と長期クリープ性能を満足することが可能となる。 According to the electric fusion type pipe joint of the present invention, the groove portion is dug in the saddle portion in a direction parallel to the axis of the resin main pipe and orthogonal to the axis of the branch portion, and the insertion piece inserted in the groove Therefore, at the time of fusion, an interface pressure sufficient for fusion bonding can be generated at the fusion interface between the electric fusion joint and the resin main pipe, and in the long-term creep performance evaluation, the tension applied to the fusion location Stress can be relieved. As a result, it is possible to satisfy sufficient fusion performance and long-term creep performance, particularly in the case of a large diameter, branch-out, saddle-shaped, electric fusion-bonded pipe joint.
本発明の電気融着式管継手の実施の形態を図１〜図４を参照して説明する。
図１に示すように、本発明の電気融着式管継手１は、樹脂製本管Ｐに接合されてガスなどの流動する流体を樹脂製本管Ｐから分岐することに使用される。電気融着式管継手１は、樹脂製本管Ｐに跨って内面が密着するように装着されるサドル部２と、サドル部２から樹脂製本管と逆方向に向かって突出する分岐部３とを備えている。分岐部３には端部からサドル部内面に向かって貫通する中空部４を備える中空形状に形成されている。また、サドル部２の樹脂製本管Ｐの軸線と直角方向（図１における左右方向）に中空の管状部５が形成されている。管状部５の左方の端部には本管穿孔用の装置（不図示）が装着されるフランジ部６を備え、右方の端部は底部７（図３を参照）が形成された閉じられた状態となっている。また、電気融着式管継手１には、樹脂製本管Ｐと電気融着式管継手１とを電気融着により接合する際に、電気融着式管継手１を樹脂製本管Ｐに固定するためのクランプ８を備えている。電気融着する際には、図１に示すようにサドル部２とクランプ８とは、その間に樹脂製本管Ｐを挟み込んでボルト９を締め付けることで樹脂製本管Ｐに固定される。
An embodiment of the electric fusion joint of the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the electric fusion type pipe joint 1 of the present invention is used for branching a flowing fluid such as gas, which is joined to a resin main pipe P, from the resin main pipe P. The electric fusion type pipe joint 1 includes a saddle portion 2 mounted so that the inner surface is in close contact with the resin main pipe P, and a branch portion 3 projecting from the saddle portion 2 in the opposite direction to the resin main pipe. Have. The branch portion 3 is formed in a hollow shape including a hollow portion 4 penetrating from the end toward the inner surface of the saddle portion. Further, a hollow tubular portion 5 is formed in a direction (right and left direction in FIG. 1) perpendicular to the axis of the resin main pipe P of the saddle portion 2. The left end of the tubular part 5 is provided with a flange 6 to which a device (not shown) for drilling a main tube is attached, and the right end is closed with a bottom 7 (see FIG. 3) formed. It is in a state of being In addition, when the resin main pipe P and the electric fusion type pipe joint 1 are joined to the electric fusion type pipe joint 1 by electric fusion, the electric fusion type pipe joint 1 is fixed to the resin main pipe P The clamp 8 is provided. When the electric fusion is performed, as shown in FIG. 1, the saddle portion 2 and the clamp 8 are fixed to the resin main pipe P by sandwiching the resin main pipe P therebetween and tightening the bolt 9.
次いで、本発明の主要部であるサドル部２について詳細を説明する。図２には電気融着式管継手１を裏返した状態を示している。図２に示すように、サドル部２は樹脂製本管Ｐに跨って密着して装着するために樹脂製本管Ｐとほぼ同じ曲率半径に形成された内面２１を有する鞍形状に形成されている。内面２１には樹脂製本管Ｐとの融着接合のために電熱線が巻回された樹脂シート２４が斜線で示される範囲に埋め込まれている。斜線で示されている範囲から中空部までの間には、電熱線が埋め込まれていない樹脂のみで形成されるコールドゾーン２５と呼ばれる範囲が設けられている。コールドゾーン２５は、電気融着式管継手１を樹脂製本管Ｐへの融着する際に、電熱線に通電されても樹脂が溶けないように設けられるので、通電により溶融した樹脂が中空部４に流れ出ることを防止して、内面２１と樹脂製本管Ｐの間の界面圧力の低下を防止する役割を担う。 Next, the saddle portion 2 which is the main part of the present invention will be described in detail. FIG. 2 shows a state in which the electric fusion joint 1 is turned over. As shown in FIG. 2, the saddle portion 2 is formed in a bowl shape having an inner surface 21 formed to have substantially the same radius of curvature as that of the resin main pipe P in order to be mounted in close contact with the resin main pipe P. On the inner surface 21, a resin sheet 24 in which heating wires are wound for fusion bonding with the resin main pipe P is embedded in a range indicated by hatching. A range called a cold zone 25 formed of only a resin in which the heating wire is not embedded is provided between the range shown by the hatching and the hollow portion. The cold zone 25 is provided so that the resin does not melt even when the heating wire is energized when the electric fusion type pipe joint 1 is fused to the main pipe P of resin, so the resin melted by the energization is a hollow portion It plays a role of preventing the decrease of the interface pressure between the inner surface 21 and the resin main pipe P by preventing the flow to 4.
図３は、図１の電気融着式管継手を樹脂製本管の軸線に直交する方向で切断した断面を示す斜視図である。サドル部２には、樹脂製本管Ｐの軸線と平行かつ分岐部と直交する方向に溝部２２が掘り込まれている。溝部２２には、溝部と同形状の挿入片２３が挿入されている。挿入片２３は、図３に示すように溝部２２とほぼ同じか若干大きな厚みを有する円盤の一部を切り欠いた三日月形状に形成されている。また、図４に示すように挿入片２３は表面が鋸刃状に形成されているので、鋸刃状の表面が溝部２２の内面に引っ掛かることで溝部２２に挿入された後に溝部２２から容易に脱落しないようになっている。また、挿入片２３の端部にはつば部２３１が形成されており、挿入片２３は溝部２２に挿入された後につば部２３１を溝部２２の入口に融着することによりサドル部２に固定されている。これにより、溝部２２からの挿入片２３の脱落がより確実に防止される。 FIG. 3 is a perspective view showing a cross section of the electric fusion joint of FIG. 1 cut in a direction perpendicular to the axis of the resin main pipe. In the saddle portion 2, a groove portion 22 is dug in a direction parallel to the axis of the resin main pipe P and orthogonal to the branch portion. An insertion piece 23 having the same shape as that of the groove is inserted into the groove 22. As shown in FIG. 3, the insertion piece 23 is formed in a crescent shape in which a part of a disk having a thickness substantially the same as or slightly larger than that of the groove 22 is cut out. Further, as shown in FIG. 4, since the surface of the insertion piece 23 is formed like a saw blade, the surface of the saw blade is caught on the inner surface of the groove 22 and inserted into the groove 22 and then easily inserted from the groove 22. It does not fall off. Further, a flange portion 231 is formed at an end portion of the insertion piece 23, and after being inserted into the groove portion 22, the insertion piece 23 is fixed to the saddle portion 2 by fusing the collar portion 231 to the inlet of the groove portion 22. ing. Thereby, falling-off of the insertion piece 23 from the groove part 22 is prevented more reliably.
次いで、図５を参照して電気融着式管継手１の使用状態について説明する。図５は、融着部の断面の模式図である。電熱線は中空部４側より複数条にわたって巻回されており、この電熱線に通電することにより発熱し、電熱線周辺の樹脂および樹脂製本管Ｐが溶融する。電気融着式管継手１は、サドル部２において分岐部３の軸線方向に電熱線と所定の間隔Ｘを隔て電熱線の発熱によって溶融しない位置に、中空部４から掘り込まれた溝部２２が形成されており、溝部２２に挿入片２３が挿入されている。もし、溝部２２に挿入片が挿入されていなかった場合には、電熱線の発熱によって溶融された溶融樹脂で、溝部２２よりも樹脂製本管側の樹脂が溝部に向かって押し込まれて変形し、融着界面における融着に必要な界面圧力が得られないおそれがある。それに対して、電気融着式管継手１では挿入片２３で溝部２２が満たされているので溶融樹脂による溝部の変形が防止される。よって、融着界面において十分な界面圧力が得られ強固な融着接合が可能となる。 Next, the state of use of the electric fusion joint 1 will be described with reference to FIG. FIG. 5 is a schematic view of a cross section of the fusion-bonded portion. The heating wire is wound in a plurality of strips from the hollow portion 4 side, and when the heating wire is energized, heat is generated and the resin around the heating wire and the resin main pipe P melt. The electric fusion type pipe joint 1 has a groove portion 22 excavated from the hollow portion 4 at a position where the heating wire is separated from the heating wire by a predetermined distance X in the axial direction of the branch portion 3 at the saddle portion 2 and does not melt. The insertion piece 23 is inserted into the groove 22. If the insertion piece is not inserted into the groove 22, the resin on the resin main pipe side of the groove 22 is pushed toward the groove and deformed with the molten resin melted by the heat generation of the heating wire. There is a possibility that the interface pressure necessary for fusion at the fusion interface can not be obtained. On the other hand, in the electric fusion type pipe joint 1, since the groove 22 is filled with the insertion piece 23, the deformation of the groove due to the molten resin is prevented. Therefore, sufficient interfacial pressure can be obtained at the fusion interface, and strong fusion bonding becomes possible.
次いで、融着接合後の長期クリープ性能について説明する。図６に示す従来技術の電気融着式管継手では、融着部の外側は全て樹脂で満たされたサドル部であるので、配管内が加圧されると最も弱い融着接合部の端部に引張応力が集中すると考えられる。そのため、熱間内圧クリープ試験において、融着接合部の端部に割れや亀裂が発生する場合がある。それに対して、本発明の電気融着式管継手は、図５に示すようにサドル部２に中空部４から掘り込まれた溝部２２が形成されているので、配管内が加圧された際には溝部２２を起点とした変形が生じることにより融着接合部の端部Ａに作用する引張応力が緩和され、融着接合部の端部の割れや亀裂を防止できる。図５に示される電気融着式管継手１では、もし、電熱線による発熱による溶融が溝部２２および挿入片２３にまで到達すると、サドル部２と挿入片２３が溶融接合されて一体になり、溝部２２を設けることによって得られる端部Ａにおける応力緩和の効果が小さくなるおそれがある。そのため、電気融着式管継手１では、電熱線と溝部２２との間隔Ｘは、サドル部２と挿入片２３とが溶融接合しないように、溝部２２が電熱線の発熱によって溶融しないように実験などにより導かれた間隔で設けられる。間隔Ｘの寸法について、ＪＩＳ Ｋ ６７７４で規定される呼び径２００Ａのガス用ポリエチレン管（１号Ｕ管）に接続される電気融着式管継手を例に説明する。この樹脂製本管に電気融着式管継手１と融着接合する際、樹脂製本管は電熱線の発熱によって表面から約６ｍｍの厚さの範囲で溶融する。約６ｍｍは管の基本厚さ１６ｍｍの約３７．５％に相当する。また、同時に電気融着式管継手１側も管の溶融範囲と同等の範囲で溶融することになるので、溝部２２を電熱線で溶融しない位置に設けるためには、若干の余裕代を設けることを考慮して電熱線と溝部２２との間隔Ｘは樹脂製本管の基本厚さの４０％以上の寸法で設定されることが望ましい。さらに、溝部２２の溝底部２２１の位置を融着接合部の端部Ａよりも外側に設けることで、融着接合部の端部Ａにおける、より高い応力緩和効果を得ることができる。また、融着条件によって最も中空部側の電熱線（Ｂ）の周辺は融着されない場合も起こり得るので、確実に融着接合部の端部が形成される電熱線の２巻目（Ｃ）よりも外側に、溝部２２の溝底部２２１を設けることがより望ましい。 Next, long-term creep performance after fusion bonding will be described. In the electric fusion type pipe joint of the prior art shown in FIG. 6, since the outside of the fusion bonding portion is a saddle portion filled with resin entirely, the end of the fusion bonding portion which is weakest when the inside of the pipe is pressurized It is thought that tensile stress concentrates on the Therefore, in the hot internal pressure creep test, a crack or a crack may occur at the end of the fusion bonded portion. On the other hand, in the electric fusion type pipe joint of the present invention, as shown in FIG. 5, the groove 22 cut out from the hollow portion 4 is formed in the saddle 2, so when the inside of the pipe is pressurized. As a result of the deformation originating from the groove 22, the tensile stress acting on the end portion A of the fusion bonded portion is relaxed, and cracking or cracking of the end portion of the fusion bonded portion can be prevented. In the electric fusion type pipe joint 1 shown in FIG. 5, if melting due to heat generation by the heating wire reaches the groove portion 22 and the insertion piece 23, the saddle portion 2 and the insertion piece 23 are melted and joined together, The effect of stress relaxation at the end A obtained by providing the groove 22 may be reduced. Therefore, in the electric fusion type pipe joint 1, the distance X between the heating wire and the groove 22 is an experiment so that the groove 22 is not melted by the heat generation of the heating wire so that the saddle portion 2 and the insertion piece 23 are not melted and bonded. It is provided in the interval led by etc. The dimension of the interval X will be described by taking an electric fusion type pipe joint connected to a polyethylene pipe for gas (No. 1 U pipe) having a nominal diameter of 200 A specified by JIS K 6774 as an example. At the time of fusion bonding with the electric fusion type pipe joint 1 to the resin main pipe, the resin main pipe melts in a thickness range of about 6 mm from the surface due to heat generation of the electric heating wire. About 6 mm corresponds to about 37.5% of the 16 mm base tube thickness. At the same time, the electric fusion type pipe joint 1 is also melted in the same range as the melting range of the pipe, so to provide the groove 22 at a position where it is not melted by the heating wire, provide a slight margin. Preferably, the distance X between the heating wire and the groove 22 is set to 40% or more of the basic thickness of the resin main pipe in consideration of the above. Furthermore, by providing the position of the groove bottom 221 of the groove 22 outside the end A of the fusion bonding, a higher stress relaxation effect can be obtained at the end A of the fusion bonding. In addition, the second winding (C) of the heating wire in which the end of the fusion bonding portion is surely formed because the periphery of the heating wire (B) closest to the hollow portion may not be fused due to the fusion conditions. It is more desirable to provide the groove bottom 221 of the groove 22 on the outer side.
本実施の形態の電気融着式管継手は、例えば都市ガスや上水の供給用に広く用いられているポリエチレン配管に使用される電気融着式管継手であり、電気融着式管継手１はポリエチレンで形成されている。また、挿入片２３も同様にポリエチレンで形成されている。 The electric fusion type pipe joint according to the present embodiment is, for example, an electric fusion type pipe joint used for polyethylene piping widely used for supply of city gas and clean water, and the electric fusion type pipe joint 1 Is formed of polyethylene. Moreover, the insertion piece 23 is similarly formed of polyethylene.
なお、本発明は、上記の実施の形態に限定されず、発明の要旨を逸脱しない範囲で変更可能であることは言うまでもない。例えば、電気融着式管継手の材質は、融着される配管に応じて選択されるのでポリエチレンに限定されない。また、挿入片の材質もポリエチレンに限定されず、例えば金属製の部材であってもよい。 It is needless to say that the present invention is not limited to the above embodiment, and can be changed without departing from the scope of the invention. For example, the material of the electrofusion joint is not limited to polyethylene because it is selected according to the piping to be fused. Further, the material of the insertion piece is not limited to polyethylene, and may be, for example, a metal member.
１：電気融着式管継手
２：サドル部
２１：内面、２２：溝部、２２１：溝底部、２３：挿入片、２３１：つば部、
２４：樹脂シート、２５：コールドゾーン
３：分岐部
４：中空部
５：管状部
６：フランジ部
７：底部
８：クランプ
９：ボルト
Ｐ：樹脂製本管
1: Electric fusion type pipe joint 2: Saddle part 21: Inner surface, 22: Groove part, 221: Groove bottom part, 23: Insertion piece, 231: Collar part,
24: resin sheet, 25: cold zone 3: branch portion 4: hollow portion 5: tubular portion 6: flange portion 7: bottom portion 8: clamp 9: bolt P: resin main pipe
Claims (4)
前記サドル部から前記樹脂製本管と逆方向に突出する分岐部と、
前記分岐部の端部から前記サドル部の内面に向かって貫通する中空部と、
を備える電気融着式管継手であって、
前記サドル部には、前記分岐部の軸線方向に前記電熱線と所定の間隔を隔てられ、前記電熱線によって溶融しない位置に掘り込まれた溝部が形成され、
前記溝部を埋める挿入片が、前記溝部と溶融接合されることなく前記溝部に挿入されていることを特徴とする電気融着式管継手。 A saddle-shaped saddle portion mounted so that the inner surface is in close contact with the resin main pipe, and a heating wire is embedded near the inner surface,
A branch that protrudes from the saddle in the direction opposite to the resin main pipe;
A hollow portion penetrating from the end of the branch portion toward the inner surface of the saddle portion;
An electric fusion type pipe joint comprising
The saddle portion is formed with a groove portion which is separated from the heating wire by a predetermined distance in the axial direction of the branch portion, and is dug into a position not melted by the heating wire.
An electric fusion type pipe joint characterized in that an insertion piece filling the groove is inserted into the groove without being fusion-bonded to the groove .
前記溝部は、巻回された前記電熱線の前記中空部の側の内側の２巻の位置よりも外側の位置に溝底部の位置がくるように形成されていることを特徴とする請求項１に記載の電気融着式管継手。 The heating wire is wound around the hollow portion in a plurality of strips,
The groove is claim, characterized in that it is formed in such a manner that the position of the groove bottom portion at a position outside the position of the two volumes of the inner side of the hollow portion of the wound the heating wire 1 Electric fusion type pipe joint as described in.
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| NL8403462A (en) * | 1984-11-13 | 1986-06-02 | Arie De Jong | METHOD FOR MANUFACTURING A CONNECTION FORM, IN PARTICULAR TAPER SEAT AND A CONNECTION FORMATION MADE ACCORDING TO THE METHOD |
| JP4263975B2 (en) * | 2003-09-19 | 2009-05-13 | 積水化学工業株式会社 | Water faucet joint with fusion saddle |
| JP2006307968A (en) * | 2005-04-28 | 2006-11-09 | Mitsui Chemicals Inc | Branch fitting |
| GB2426306A (en) * | 2005-05-18 | 2006-11-22 | Uponor Innovation Ab | Tapping tee with flexible spigot |
| JP2012137147A (en) * | 2010-12-27 | 2012-07-19 | Kubota-Ci Co | Branch saddle joint and insert member |
| JP5832248B2 (en) * | 2011-11-09 | 2015-12-16 | クボタシーアイ株式会社 | Fusion inner and branch saddle joint using the same |
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