JP4603680B2 - Welding confirmation method for thermoplastic resin pipe joints - Google Patents

Welding confirmation method for thermoplastic resin pipe joints Download PDF

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Publication number
JP4603680B2
JP4603680B2 JP2000391190A JP2000391190A JP4603680B2 JP 4603680 B2 JP4603680 B2 JP 4603680B2 JP 2000391190 A JP2000391190 A JP 2000391190A JP 2000391190 A JP2000391190 A JP 2000391190A JP 4603680 B2 JP4603680 B2 JP 4603680B2
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Prior art keywords
pipe
thermoplastic resin
connecting pipe
small hole
heating wire
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JP2002192622A (en
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充亮 時吉
研志 田代
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Dainippon Plastics Co Ltd
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Dainippon Plastics Co 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"
    • B29C65/3472—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 composition of the heated elements which remain in the joint
    • B29C65/3476—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 composition of the heated elements which remain in the joint being metallic
    • 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
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • 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
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1226—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least one bevelled joint-segment
    • 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
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • 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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/97—Checking completion of joining or correct joining by using indications on at least one of the joined parts
    • B29C66/976—Checking completion of joining or correct joining by using indications on at least one of the joined parts by the use of an indicator pin, e.g. being integral with one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、熱可塑性樹脂製管継手の溶着接続確認方法に関し、更に詳しくは熱可塑性樹脂製接続管の差し口の外周面又は熱可塑性樹脂製被接続管の受け口の内周面に、その円周方向に沿って、電熱線を巻設し、被接続管の受け口に接続管の差し口を挿入した後、電熱線に通電することにより、接続管と被接続管とを一体に溶着接続する、上・下水道管などに使用される管継手の溶着接続確認方法に関するのものである。とりわけφ200mmからφ2000mmもしくはそれ以上の管継手を対象とする。
【０００２】
【従来の技術】
従来、電気的溶着管継手、すなわちエレクトロフュージョン管継手の溶着状態を確認する方法は、大口径では実用化されていない。一方、小口径、特にφ200以下の合成樹脂製管継手においては、一般的にソケット型継手において仕様事例がある。つまり、溶着確認方法としてはソケットを成形するときにピンのようなものをインサート成形させ、溶着時にピンが内面からの樹脂の膨張によって隆起されれば電熱線への通電完了であるといった方法であった。
【０００３】
【発明が解決しようとする課題】
しかし、従来の技術では、上述のごとく、内面からの熱可塑性樹脂の隆起によって確認するといった方法であるため、確実に隆起されることが条件となるが、大口径の管継手は、小口径の管継手とは異なり管の厚さが非常に大きなものとなるため、熱可塑性樹脂の隆起による定量的な判断が非常に困難であった。また、大口径の樹脂製管は、通常、押出成形であるため、インサート成形が難しい。
【０００４】
【課題を解決するための手段】
本発明は、熱可塑性樹脂製接続管の差し口の外周面又は熱可塑性樹脂製被接続管の受け口の内周面に、その円周方向に沿って電熱線を巻設した後、被接続管の受け口に接続管の差し口を挿入し、次いで電熱線に通電することにより、接続管と被接続管とを一体に溶着接続するに際して、被接続管の受け口に予め小孔を穿設し、電熱線に通電後、前記小孔を介して細棒を押し込み、接続管の差し口内への所定深さ以上のくい込みにより、接続管と被接続管との溶着接続完了を確認する工程を備え、前記接続管、被接続管および細棒が、同じ熱可塑性樹脂で形成されてなることを特徴とする熱可塑性樹脂製管継手の溶着接続確認方法を提供する。
【０００５】
すなわち、本発明は、接続管と被接続管とを一体に溶着接続するに際して、被接続管の受け口に予め小孔を穿設し、電熱線に通電後、前記小孔を介して細棒を押し込み、接続管の差し口内への所定深さ以上のくい込みにより、接続管と被接続管との溶着接続完了を確認しようとするものであり、それによって、単に細棒を押し込むだけで、簡便で、かつ確実に接続管の溶着接続を非破壊的に確認することができる。
【０００６】
つまり、例えば、被接続管の受け口内面または接続管の差し口外面に巻設されている電熱線の位置より両接続管の中心方向に向かい、完全な溶着（融着）がなされる深さ方向の長さを予め各製品毎に計測し、溶融されていなければ押し込むことが出来ない値を、くい込みの所定深さとして設定する。たとえば、口径２００ｍｍ程度の管継手の場合、被接続管の所定深さを４〜１０ｍｍ、好ましくは６ｍｍとする。
【０００７】
すなわち、具体的には、小孔を直径３〜５ｍｍの通孔とし、細棒を直径２．８〜４．８ｍｍ、長さを被接続管の肉厚（小孔の深さ）に所定深さを加えた値に設定すれば、細棒（両接続管と同じ熱可塑性樹脂製が好ましい）を受け口外表面の均等面の位置まで押し込む作業を実施するのみで、電熱線近傍の樹脂の溶融状態を簡易的に判断でき、さらに押し込まれた細棒は溶融された近傍の熱可塑性樹脂と一体化し、溶着接続確認後も溶着接続に影響を与えることなく、そのままの状態を維持することが出来る。好ましくは、小孔径より若干径の小さな細棒とする。
【０００８】
本発明は、別の観点によれば、差し口を有する熱可塑性樹脂製接続管と、この接続管の差し口を受ける受け口を有し、この受け口に予め穿設された小孔を有する熱可塑性樹脂製被接続管と、この被接続管の受け口の内周面または接続管の差し口の外周面に、その円周方向に沿って巻設され、被接続管の受け口に接続管の差し口を挿入後、通電により接続管と被接続管とを一体に溶着接続させる電熱線と、この電熱線に通電後、前記小孔を介して押し込まれ、接続管の差し口内へ所定深さ以上くい込まれた溶着接続確認用細棒とからなり、前記接続管、被接続管および細棒が、同じ熱可塑性樹脂で形成されてなる熱可塑性樹脂製管継手を提供する。
【０００９】
【発明の実施の形態】
以下、本発明に係る熱可塑性樹脂製管継手の溶着接続確認方法を図に示す実施の形態に基づいて詳述する。なお、これにより本発明が限定されるものではない。
【００１０】
図１は本発明に係る熱可塑性樹脂製管継手の溶着接続確認方法を説明するための熱可塑性樹脂製管継手の接続前の状態を示す斜視図であり、受け口部を一端に有する。図２は、受け口部に小孔を形成した様子を表す断面図、図３はその小孔に溶着接続の指標として用いる細棒としての熱可塑性樹脂製円筒棒を示す斜視図である。図４は細棒の差込み完了の様子を、要部が完全に溶融された場合（ａ）と、不完全な溶融がなされた場合（ｂ）を比較する要部断面図である。また、図５には管継手が溶融されている様子を温度分布として要部断面図で表したものである。
【００１１】
まず、図１において、１は熱可塑性樹脂製管（接続管）としてのポリエチレン製管、４は熱可塑性樹脂製管１の差し口部、２は熱可塑性樹脂製管（被接続管）としてのポリエチレン製継手１ａの受け口部を表している。さらに３は受け口部２に巻き線された電熱線である。
そして図２において、図１の２に相当する受け口部５には、φ３〜５mmの小孔６が穿設されている。小孔６には、通電完了後に図３に示される熱可塑性樹脂製円筒棒７が押し込まれる。従って前記熱可塑性樹脂製円筒棒７は、小孔６の直径よりも若干小さく設計されるとよい。
そして図４ａ及び図４ｂにそれぞれ通電完了後の違う状態の例を記載している。図４ａに示される状態は、熱可塑性樹脂製管の受け口部８と熱可塑性樹脂製管の差し口部９が嵌合され、あらかじめインサートされている電熱線１０に通電を行い、管継手の溶着一体化がなされたのち、所定のエネルギー量が管継手の接合箇所に供給されていない場合を表すものである。この場合、熱可塑性樹脂製円筒棒７は、受け口外表面相当位置まで押し込むことが不可能となる。しかし、溶着が完全になされた場合、図４ｂに示されるように熱可塑性樹脂製円筒棒１１（図４ａの７相当）は、受け口外表面と同等の位置まで押し込むことが可能となる。
【００１２】
別の視点よりこの発明の実施の形態を説明すると、図２の熱可塑性樹脂製管の受け口５の厚さがｔmmであるとき、母材と同等の熱可塑性樹脂で成形された図３に示す、細棒としての熱可塑性樹脂製円筒棒は（ｔ＋６）mmに設計されることが望ましい。そして通電が完了した直後に熱可塑性樹脂製円筒棒を受け口外表面よりインサートさせる。
図５に示すように、（ｔ＋６）mmで設計された熱可塑性樹脂製円筒棒１５は、６mmの長さに相当する部分が溶着される熱可塑性樹脂製管の差し口１７にインサートされる。これによると、巻線された電熱線１８より管円周方向への温度分布は、電熱線部より離れるに従って温度が低下していき、電熱線部より円周方向に６mm離れた部分では、母材温度が130℃〜150℃となっている。そのため、受け口外表面よりインサートされる熱可塑性樹脂製円筒棒１５は、受け口厚さｔmmより６mm長めに設計され、受け口外表面と同等面まで押し込むことが可能ならば、十分な溶着がなされていることを簡易的に確認することが出来る。さらに押し込まれた熱可塑性樹脂製円筒棒１５は、母材と同様の樹脂製であるために押し込み後は、管と一体化されるようになる。
【００１３】
【発明の効果】
この発明によれば、接続管と被接続管とを一体に溶着接続するに際して、被接続管の受け口に予め小孔を穿設し、電熱線に通電後、前記小孔を介して細棒を押し込み、接続管の差し口内への所定深さ以上のくい込みにより、接続管と被接続管との溶着接続完了を確認しようとするものであり、それによって、単に細棒を押し込むだけで、簡便で、かつ確実に接続管の溶着接続を非破壊的に確認することができる。
【図面の簡単な説明】
【図１】本発明に係る熱可塑性樹脂性管継手の溶着接続確認方法を説明するための熱可塑性樹脂製管継手の接続前の状態を示す斜視図である。
【図２】熱可塑性樹脂製管の受け口の要部拡大断面図である。
【図３】熱可塑性樹脂製円筒棒の斜視図である。
【図４】熱可塑性樹脂製管の受け口部に挿入される熱可塑性樹脂製円筒棒まわりの構成を表す要部断面図である。
【図５】管継手の溶着される断面の温度分布を示す要部断面図である。
【符号の説明】
１ ポリエチレン製管（熱可塑性樹脂製管）
２ 受け口部
３ 電熱線
４ 差し口部
５ 受け口部
６ 小孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for confirming a welded connection of a pipe joint made of thermoplastic resin, and more specifically, on the outer peripheral surface of the insertion port of the thermoplastic resin connection pipe or the inner peripheral surface of the receptacle of the thermoplastic resin connection pipe. A heating wire is wound along the circumferential direction, and after inserting the connection tube outlet into the receiving port of the connected tube, the connecting wire and the connecting tube are integrally welded and connected by energizing the heating wire. It relates to a method for confirming the welded connection of pipe joints used for water and sewer pipes. In particular, pipe joints of φ200mm to φ2000mm or more are targeted.
[0002]
[Prior art]
Conventionally, a method for confirming the welded state of an electric welded pipe joint, that is, an electrofusion pipe joint, has not been put to practical use with a large diameter. On the other hand, in the case of a synthetic resin pipe joint having a small diameter, particularly φ200 or less, there is generally a specification example of a socket type joint. In other words, the welding confirmation method is a method in which a pin-like object is insert-molded when molding the socket, and if the pin is raised by the expansion of the resin from the inner surface during welding, the energization to the heating wire is completed. It was.
[0003]
[Problems to be solved by the invention]
However, in the conventional technology, as described above, since it is a method of confirming by the rising of the thermoplastic resin from the inner surface, it is necessary to be surely raised, but a large-diameter pipe joint is a small-diameter Unlike pipe joints, the thickness of the pipe is very large, so it was very difficult to make a quantitative judgment based on the rise of the thermoplastic resin. Moreover, since a large diameter resin pipe is usually extrusion molding, insert molding is difficult.
[0004]
[Means for Solving the Problems]
The present invention relates to a pipe to be connected after winding a heating wire along the circumferential direction on the outer peripheral surface of the outlet of the connecting pipe made of thermoplastic resin or the inner peripheral face of the receiving pipe of the connecting pipe made of thermoplastic resin. When the connecting pipe and the connected pipe are integrally welded and connected by inserting the connecting pipe outlet into the receiving hole and then energizing the heating wire, a small hole is previously drilled in the receiving pipe of the connected pipe, After energizing the heating wire, a process of confirming the completion of the welding connection between the connecting pipe and the connected pipe by pushing a thin rod through the small hole and biting into the outlet of the connecting pipe at a predetermined depth or more , The connection pipe, the pipe to be connected, and the thin rod are formed of the same thermoplastic resin, and a welded connection confirmation method for a thermoplastic resin pipe joint is provided.
[0005]
That is, according to the present invention, when the connecting pipe and the connected pipe are welded and connected integrally, a small hole is formed in advance in the receiving port of the connected pipe, and after passing through the heating wire, the thin rod is inserted through the small hole. It is intended to confirm the completion of the welded connection between the connecting pipe and the connected pipe by pushing in and inserting into the outlet of the connecting pipe at a predetermined depth or more. And, the welded connection of the connecting pipe can be confirmed nondestructively.
[0006]
That is, for example, the depth direction in which complete welding (fusion) is performed from the position of the heating wire wound on the inner surface of the receiving port of the connected tube or the outer surface of the connecting tube toward the center of both connecting tubes. Is measured in advance for each product, and a value that cannot be pushed in unless melted is set as a predetermined depth of biting. For example, in the case of a pipe joint having a diameter of about 200 mm, the predetermined depth of the connected pipe is 4 to 10 mm, preferably 6 mm.
[0007]
Specifically, the small hole is a through hole having a diameter of 3 to 5 mm, the thin rod is 2.8 to 4.8 mm in diameter, and the length is a predetermined depth corresponding to the thickness of the connected pipe (depth of the small hole). If this value is added, it is only necessary to push the thin rod (preferably made of the same thermoplastic resin as both connecting pipes) to the position of the uniform surface on the outer surface of the mouth, and melt the resin near the heating wire. The state can be easily judged, and the pressed-in thin bar is integrated with the molten thermoplastic resin in the vicinity, and it can be maintained as it is without affecting the welded connection even after confirmation of the welded connection. . Preferably, a thin rod having a slightly smaller diameter than the small hole diameter is used.
[0008]
According to another aspect of the present invention, there is provided a thermoplastic resin connecting pipe having an insertion opening and a receiving opening for receiving the insertion opening of the connecting pipe, and a thermoplastic having a small hole previously formed in the receiving opening. It is wound along the circumferential direction on the inner peripheral surface of the connecting pipe made of resin and the receiving port of the connecting pipe or the outer peripheral surface of the connecting pipe, and the connecting pipe is inserted into the receiving port of the connecting pipe. After inserting, the heating wire that welds and connects the connecting pipe and the connected pipe together by energization, and after energizing this heating wire, it is pushed through the small hole and inserted into the outlet of the connecting pipe to a predetermined depth or more. the Ri Do and a welding connection confirmation wand, said connection tube and the connection tube and the rods, provides a thermoplastic resin pipe joint made of formed of the same thermoplastic resin.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the welding connection confirmation method of the pipe joint made of thermoplastic resin according to the present invention will be described in detail based on the embodiments shown in the drawings. Note that the present invention is not limited thereby.
[0010]
FIG. 1 is a perspective view showing a state before connection of a thermoplastic resin pipe joint for explaining a welding connection confirmation method for a thermoplastic resin pipe joint according to the present invention, and has a receiving port at one end. FIG. 2 is a cross-sectional view showing a state in which a small hole is formed in the receiving port, and FIG. 3 is a perspective view showing a thermoplastic resin cylindrical rod as a thin rod used as an index for welding connection in the small hole. FIG. 4 is a cross-sectional view of the main part comparing the state in which the insertion of the thin rod is completed when the main part is completely melted (a) and when the incomplete melting is performed (b). Further, FIG. 5 shows a state where the pipe joint is melted as a temperature distribution in a cross-sectional view of the main part.
[0011]
First, in FIG. 1, 1 is a polyethylene pipe as a thermoplastic resin pipe (connecting pipe), 4 is an inlet of the thermoplastic resin pipe 1, and 2 is a thermoplastic resin pipe (connected pipe). The receptacle part of the polyethylene joint 1a is shown. Further, 3 is a heating wire wound around the receiving port 2.
In FIG. 2, a small hole 6 having a diameter of 3 to 5 mm is formed in the receiving portion 5 corresponding to 2 in FIG. The cylindrical hole 7 made of a thermoplastic resin shown in FIG. 3 is pushed into the small hole 6 after completion of energization. Therefore, the thermoplastic resin cylindrical rod 7 is preferably designed to be slightly smaller than the diameter of the small hole 6.
4a and 4b show examples of different states after completion of energization. The state shown in FIG. 4a is that the receiving port portion 8 of the thermoplastic resin tube and the insertion port portion 9 of the thermoplastic resin tube are fitted, and the heating wire 10 inserted in advance is energized to weld the pipe joint. This shows a case where a predetermined amount of energy is not supplied to the joint portion of the pipe joint after the integration. In this case, the cylindrical rod 7 made of thermoplastic resin cannot be pushed to the position corresponding to the outer surface of the receiving port. However, when the welding is complete, as shown in FIG. 4b, the thermoplastic resin cylindrical rod 11 (corresponding to 7 in FIG. 4a) can be pushed to the same position as the outer surface of the receiving port.
[0012]
The embodiment of the present invention will be described from another point of view. When the thickness of the receiving port 5 of the thermoplastic resin pipe shown in FIG. 2 is tmm, it is shown in FIG. 3 which is formed of a thermoplastic resin equivalent to the base material. The cylindrical rod made of thermoplastic resin as the thin rod is preferably designed to be (t + 6) mm. Immediately after the energization is completed, a thermoplastic resin cylindrical rod is inserted from the outer surface of the receptacle.
As shown in FIG. 5, a thermoplastic resin cylindrical rod 15 designed with (t + 6) mm is inserted into the outlet 17 of a thermoplastic resin pipe to which a portion corresponding to a length of 6 mm is welded. According to this, the temperature distribution in the circumferential direction of the tube from the wound heating wire 18 decreases as the distance from the heating wire portion increases, and in the portion 6 mm away from the heating wire portion in the circumferential direction, the mother The material temperature is 130 ° C to 150 ° C. Therefore, the thermoplastic resin cylindrical rod 15 inserted from the outer surface of the receiving port is designed to be 6 mm longer than the receiving port thickness tmm, and if it can be pushed to the same surface as the outer surface of the receiving port, sufficient welding is performed. This can be easily confirmed. Further, since the cylindrical rod 15 made of thermoplastic resin is made of the same resin as the base material, it is integrated with the pipe after being pushed.
[0013]
【The invention's effect】
According to the present invention, when the connecting pipe and the connected pipe are integrally welded and connected, a small hole is made in advance in the receiving port of the connected pipe, and after passing through the heating wire, the thin rod is inserted through the small hole. It is intended to confirm the completion of the welded connection between the connecting pipe and the connected pipe by pushing in and inserting into the outlet of the connecting pipe at a predetermined depth or more. And, the welded connection of the connecting pipe can be confirmed nondestructively.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state before connection of a thermoplastic resin pipe joint for explaining a method for confirming weld connection of a thermoplastic resin pipe joint according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of a receptacle of a thermoplastic resin pipe.
FIG. 3 is a perspective view of a cylindrical rod made of thermoplastic resin.
FIG. 4 is a cross-sectional view of a principal part showing a configuration around a thermoplastic resin cylindrical rod inserted into a receiving portion of a thermoplastic resin pipe.
FIG. 5 is a cross-sectional view of a main part showing a temperature distribution of a cross section of a pipe joint to be welded.
[Explanation of symbols]
1 Polyethylene pipe (thermoplastic resin pipe)
2 Receptacle part 3 Heating wire 4 Insertion part 5 Receptacle part 6 Small hole

Claims (5)

熱可塑性樹脂製接続管の差し口の外周面又は熱可塑性樹脂製被接続管の受け口の内周面に、その円周方向に沿って電熱線を巻設した後、被接続管の受け口に接続管の差し口を挿入し、次いで電熱線に通電することにより、接続管と被接続管とを一体に溶着接続するに際して、被接続管の受け口に予め小孔を穿設し、電熱線に通電後、前記小孔を介して細棒を押し込み、接続管の差し口内への所定深さ以上のくい込みにより、接続管と被接続管との溶着接続完了を確認する工程を備え、前記接続管、被接続管および細棒が、同じ熱可塑性樹脂で形成されてなることを特徴とする熱可塑性樹脂製管継手の溶着接続確認方法。On the outer peripheral surface of the outlet of the thermoplastic resin connecting pipe or the inner peripheral surface of the receiving port of the thermoplastic resin connected pipe, a heating wire is wound along the circumferential direction, and then connected to the receiving port of the connected pipe When connecting the connecting pipe and the pipe to be connected together by welding by inserting the inlet of the pipe and then energizing the heating wire, a small hole is made in advance in the receptacle of the pipe to be connected and the heating wire is energized. Thereafter, a step of checking the completion of the welding connection between the connecting pipe and the connected pipe by pushing a thin rod through the small hole and biting into the inlet of the connecting pipe at a predetermined depth or more , the connecting pipe, A welded connection confirmation method for a pipe joint made of thermoplastic resin, wherein the pipe to be connected and the thin rod are formed of the same thermoplastic resin . 小孔が、直径３〜５ｍｍの通孔である請求項１に記載の溶着接続確認方法。  The welding connection confirmation method according to claim 1, wherein the small hole is a through hole having a diameter of 3 to 5 mm. くい込みの所定深さが、４〜１０ｍｍである請求項１又は２に記載の溶着接続確認方法。  The welding connection confirmation method according to claim 1 or 2, wherein the predetermined depth of biting is 4 to 10 mm. 細棒が、小孔の深さにくい込みの所定深さを加えた長さである請求項１〜３のいずれか１つに記載の溶着接続確認方法。  The welding connection confirmation method according to any one of claims 1 to 3, wherein the thin rod has a length obtained by adding a predetermined depth that is difficult to make the small hole deep. 差し口を有する熱可塑性樹脂製接続管と、
この接続管の差し口を受ける受け口を有し、この受け口に予め穿設された小孔を有する熱可塑性樹脂製被接続管と、
この被接続管の受け口の内周面または接続管の差し口の外周面に、その円周方向に沿って巻設され、被接続管の受け口に接続管の差し口を挿入後、通電により接続管と被接続管とを一体に溶着接続させる電熱線と、
この電熱線に通電後、前記小孔を介して押し込まれ、接続管の差し口内へ所定深さ以上くい込まれた溶着接続確認用細棒と
からなり、前記接続管、被接続管および細棒が、同じ熱可塑性樹脂で形成されてなる熱可塑性樹脂製管継手。A thermoplastic resin connecting pipe having an inlet;
A connecting pipe made of a thermoplastic resin having a receiving opening for receiving the insertion opening of the connecting pipe, and having a small hole previously drilled in the receiving opening;
It is wound around the inner peripheral surface of the receiving port of this connected pipe or the outer peripheral surface of the connecting tube's outlet along the circumferential direction. After inserting the connecting port's outlet into the receiving port of the connected pipe, it is connected by energization A heating wire that welds and connects the pipe and the connected pipe together;
After energizing the heating wire, said pushed through a small hole, Ri Do from the connection pipe to insert the mouth with a predetermined depth or bite the welded connection confirmation thin rod of the connecting pipe, the connecting pipe and the rods Are thermoplastic resin pipe joints formed of the same thermoplastic resin .
JP2000391190A 2000-12-22 2000-12-22 Welding confirmation method for thermoplastic resin pipe joints Expired - Fee Related JP4603680B2 (en)

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DE102010024691B4 (en) 2010-06-23 2017-01-05 Norma Germany Gmbh pipe arrangement
CN103203874B (en) * 2013-04-11 2015-05-20 浙江大学 Device and method for stripping test of electro-fusion joint
CN103968178A (en) * 2014-05-06 2014-08-06 屠兴章 Double-hot-melting two-side socket sealing sleeve, connecting structure and connecting method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0647819A (en) * 1992-07-29 1994-02-22 Nippon Zeon Co Ltd Melt confirming method and its sensor
JPH0716931A (en) * 1993-06-29 1995-01-20 Toa Koukiyuu Keishiyu Valve Seizo Kk Electric melt welding apparatus of resin product

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0647819A (en) * 1992-07-29 1994-02-22 Nippon Zeon Co Ltd Melt confirming method and its sensor
JPH0716931A (en) * 1993-06-29 1995-01-20 Toa Koukiyuu Keishiyu Valve Seizo Kk Electric melt welding apparatus of resin product

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