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JP2864507B2 - Plastic pipe fusion joints - Google Patents

Plastic pipe fusion joints

Info

Publication number
JP2864507B2
JP2864507B2 JP63285523A JP28552388A JP2864507B2 JP 2864507 B2 JP2864507 B2 JP 2864507B2 JP 63285523 A JP63285523 A JP 63285523A JP 28552388 A JP28552388 A JP 28552388A JP 2864507 B2 JP2864507 B2 JP 2864507B2
Authority
JP
Japan
Prior art keywords
pipe
groove
joint
socket
branch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP63285523A
Other languages
Japanese (ja)
Other versions
JPH02130129A (en
Inventor
隆 中野
史朗 有賀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Priority to JP63285523A priority Critical patent/JP2864507B2/en
Publication of JPH02130129A publication Critical patent/JPH02130129A/en
Application granted granted Critical
Publication of JP2864507B2 publication Critical patent/JP2864507B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B29C66/11—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
    • B29C66/11—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
    • B29C66/1122—Single lap to lap joints, i.e. overlap 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
    • B29C66/12—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
    • B29C66/1224—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 butt 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
    • B29C66/13—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
    • B29C66/5221—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
    • B29C66/50—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
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • 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
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • 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
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52296—Joining tubular articles involving the use of a socket said socket comprising sealing elements, e.g. gaskets
    • 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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 ［産業上の利用分野］ この発明は、ポリエチレン管、ポリブテン管等のプラ
スチック管の融着継手に関するものである。Description: TECHNICAL FIELD The present invention relates to a fusion joint of a plastic pipe such as a polyethylene pipe and a polybutene pipe.

［従来の技術］ 従来からポリエチレン管の接着方法の１つとして、熱
融着継手方式、通称EFF（エレクトロフュージョンフィ
ティング）方式がある。例えばソケットにより管を接続
する場合、第５図に示すように、ソケット２の内面2a近
くに電熱線３を周方向にスバイラル状に埋設しておき、
このソケット２に被接続管１を差し込んで、ターミナル
3aから電熱線３に通電してジュール熱を発生させ、この
熱でソケット２の内面2a及び被接続管１の外面1aを溶融
させて接合する。また、管に分岐部を設ける場合には、
第６図に示すように、サドル状本体部７に分岐部８を突
設した分岐サドル６の本体部内面7a近くに、電熱線９を
分岐部８を中心にしてスパイラル状に埋設しておいて、
上記と同様にして、サドル６を管１に押圧融着して分岐
部を形成し、最後に分岐穴1cをあけている。[Prior Art] Conventionally, as one method of bonding polyethylene pipes, there is a heat fusion joint method, commonly called an EFF (Electrofusion Fitting) method. For example, when connecting a pipe with a socket, as shown in FIG. 5, a heating wire 3 is buried in a spiral shape in the circumferential direction near the inner surface 2a of the socket 2,
The connected pipe 1 is inserted into the socket 2 and a terminal
Electric current is applied to the heating wire 3 from 3a to generate Joule heat, and this heat melts and joins the inner surface 2a of the socket 2 and the outer surface 1a of the connected pipe 1. In addition, when providing a branch in the pipe,
As shown in FIG. 6, a heating wire 9 is buried spirally around the branch portion 8 near the inner surface 7a of the main body portion of the branch saddle 6 in which the branch portion 8 protrudes from the saddle-shaped main body portion 7. And
In the same manner as above, the saddle 6 is pressed and fused to the tube 1 to form a branch portion, and finally a branch hole 1c is opened.

［解決しようとする課題］ しかし、ソケット２に管１を差し込んで接合した場
合、第５図に示すように、ソケット２の内面2aと管１の
端面1bによるコーナー部Ｃが形成される。また、管端部
に未融着部が残った場合には、ここにスリットが形成さ
れる。そして、管１に内圧や軸力が付加されると、この
コーナー部Ｃやスリット部に応力集中が生じ、長期間の
使用を考えると、プラスチック特有のクリープ現象によ
って、この部分から割れが生ずる危険がある。また、電
熱線３（銅、その他）自体はポリエチレン樹脂との接着
性が悪いため、上記の割れがこの電熱線埋め込み部につ
ながると、割れがそれ以上進行しなくても、流体が割れ
から電熱線を伝わって漏洩する危険が多い。一方、管１
にサドル６を接着した場合にも、第６図に示すように、
サドル６の分岐部８の穴8aの端部と管１との融着部にコ
ーナー部Ｃが形成され、また、電熱線９の最も内側の位
置は施工上穴8aの外周から若干離れているので、この部
に未融着部が残り、スリット部が形成され、上記と同様
な問題が生ずる。[Problem to be Solved] However, when the tube 1 is inserted into and joined to the socket 2, a corner portion C is formed by the inner surface 2a of the socket 2 and the end surface 1b of the tube 1 as shown in FIG. If an unfused portion remains at the end of the tube, a slit is formed here. When an internal pressure or an axial force is applied to the pipe 1, stress concentration occurs at the corners C and the slits, and considering long-term use, there is a danger that cracks will occur from these parts due to the creep phenomenon peculiar to plastic. There is. In addition, since the heating wire 3 (copper, etc.) itself has poor adhesion to the polyethylene resin, if the above cracks lead to the heating wire embedment portion, even if the cracking does not progress further, the fluid will be broken and the electrical power will be reduced. There is a high risk of leakage through the heat rays. Meanwhile, tube 1
Also, when the saddle 6 is adhered to the
A corner portion C is formed at the fusion portion between the end of the hole 8a of the branch portion 8 of the saddle 6 and the pipe 1, and the innermost position of the heating wire 9 is slightly away from the outer periphery of the hole 8a for construction. Therefore, an unfused portion remains in this portion and a slit portion is formed, and the same problem as described above occurs.

この発明は上記のような問題点を解消することを課題
とするものである。An object of the present invention is to solve the above problems.

［課題を解決するための手段］ この発明のプラスチック管の融着継手は、継手と被接
続管端部との融着接続端部近傍に、応力集中を軽減する
断面円弧状の溝を設けると共に、上記溝内にＯリングを
装着したことを特徴とするものである。[Means for Solving the Problems] The fusion spliced joint for plastic pipes of the present invention is provided with an arc-shaped groove for reducing stress concentration near the fusion spliced end between the joint and the connected pipe end. An O-ring is mounted in the groove.

［作用］ 継手と被接続管端部との融着接続端部近傍に、応力集
中を軽減する断面円弧状の溝を設けた構成により、従来
問題になっていた応力集中の問題を解消することができ
る。また、溝内にＯリングを装着したので、シール性
（気密性能）を向上させることができる。[Operation] By providing a groove having an arc-shaped cross section to reduce stress concentration near the fusion spliced end between the joint and the end of the connected pipe, the problem of stress concentration, which has conventionally been a problem, is solved. Can be. In addition, since the O-ring is mounted in the groove, the sealing performance (airtightness) can be improved.

［実施例］ 以下、本発明の１実施例を継手10としてのソケット11
により管を接続する場合について第１〜２図により説明
する。[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to a socket 11 as a joint 10.
The case where the pipe is connected by the method will be described with reference to FIGS.

ソケット11の内面11aの、被接続管１の差し込み融着
端部に位置して、応力集中を軽減すると共に、Ｏリング
13の装着保持部となる断面円弧状の溝12が形成されてい
る。この溝12の曲率半径は８〜10mmとなっている。そし
て、溝12にＯリング13を装着し、管１を差込んで、第２
図に示す状態にしてから、ソケット11を従来と同様にし
て管１に融着する。管１の端部1bとソケット内面11aと
の間にコーナー部が形成されず、またスリット部も形成
されないので、この部分での応力集中が大幅に軽減され
る。即ち、従来の応力集中係数2.5〜３が、1.2〜1.5に
軽減される。その上、溝12にＯリング13が装着されてい
るので、電熱線３に沿っての流体の漏洩が防止されるの
で、シール性を向上させることができる。The inner surface 11a of the socket 11 is located at the insertion and fusion end of the connected tube 1 to reduce stress concentration and to reduce the O-ring.
A groove 12 having an arc-shaped cross section to be a mounting and holding portion of 13 is formed. The radius of curvature of the groove 12 is 8 to 10 mm. Then, the O-ring 13 is attached to the groove 12, the pipe 1 is inserted, and the second
After the state shown in the figure, the socket 11 is fused to the tube 1 in the same manner as in the prior art. Since no corner is formed between the end 1b of the tube 1 and the inner surface 11a of the socket and no slit is formed, stress concentration at this portion is greatly reduced. That is, the conventional stress concentration coefficient of 2.5 to 3 is reduced to 1.2 to 1.5. In addition, since the O-ring 13 is mounted in the groove 12, the leakage of the fluid along the heating wire 3 is prevented, so that the sealing performance can be improved.

次に、継手10としての分岐サドル16を管１に融着して
分岐部を形成する場合について、第３〜４図より説明す
る。Next, a case where a branch saddle 16 as the joint 10 is fused to the pipe 1 to form a branch portion will be described with reference to FIGS.

サドル16の分岐部18部の穴18aの管１との融着接続端
部に、応力集中を軽減すると共にＯリングの装着部とな
る溝19が形成されている。そして、溝19にＯリング20を
装着し、管１に押圧して、第４図に示す状態にしてか
ら、サドル16を従来と同様にして管１に融着する。分岐
部の穴18aの端部と管１のとの間にコーナー部が形成さ
れず、この間に集中応力を軽減する溝19があるから、実
質的に応力集中部を形成し、破壊の起点となるようなス
リット部も形成されないので、この部分での応力集中が
大幅に軽減される。なお、Ｏリング20により上記例の場
合と同様の効果を得ることができる。A groove 19 for reducing stress concentration and serving as an O-ring mounting portion is formed at the fusion splicing end of the hole 18a of the branch portion 18 of the saddle 16 with the tube 1. Then, the O-ring 20 is fitted in the groove 19, pressed against the tube 1 to bring it into the state shown in FIG. 4, and the saddle 16 is fused to the tube 1 in the same manner as in the prior art. No corner is formed between the end of the hole 18a of the branch and the pipe 1 and there is a groove 19 for reducing the concentrated stress between them. Since no such slit portion is formed, stress concentration at this portion is greatly reduced. The same effect as in the above example can be obtained by the O-ring 20.

［発明の効果］ この発明のプラスチック管の融着継手は、上記のよう
なもので、継手の被接続管との融着接続部での集中応力
を軽減することができる。また、融着接続部での、シー
ル性（気密性能）を向上させることができる。[Effect of the Invention] The fusion spliced joint for a plastic pipe of the present invention is as described above, and can reduce the concentrated stress at the fusion spliced portion of the joint with the connected pipe. In addition, the sealing property (airtightness) at the fusion spliced portion can be improved.

【図面の簡単な説明】[Brief description of the drawings]

第１図及び第２図は本発明の継手の１実施例を示すソケ
ットの縦断面図と被接続管に融着された状態の縦断面
図。第３図及び第４図は他の１実施例としての分岐サド
ルの縦断面図と被接続管に融着された状態の縦断面図。
第５図は従来のソケットが被接続管に融着された状態の
縦断面図、第６図は分岐サドルが被接続管に融着された
状態の管軸方向の縦断面図である。 １……被接続管、10……継手、11……ソケット、16……
分岐サドル、12、19……断面円弧状の溝、13、20……Ｏ
リング1 and 2 are a longitudinal sectional view of a socket and a longitudinal sectional view of a state in which the joint is fused to a pipe to be connected, showing one embodiment of the joint of the present invention. FIG. 3 and FIG. 4 are a longitudinal sectional view of a branch saddle as another embodiment and a longitudinal sectional view in a state of being fused to a connected pipe.
FIG. 5 is a longitudinal sectional view showing a state in which a conventional socket is fused to a connected pipe, and FIG. 6 is a longitudinal sectional view in a pipe axis direction in which a branch saddle is fused to a connected pipe. 1 ... connected pipe, 10 ... fitting, 11 ... socket, 16 ...
Branch saddle, 12, 19 …… A groove with an arcuate cross section, 13, 20… O
ring

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 65/02 - 65/36 F16L 47/02──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B29C 65/02-65/36 F16L 47/02

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】継手と被接続管端部との融着接続端部近傍
に、応力集中を軽減する断面円弧状の溝を設けると共
に、上記溝内にＯリングを装着したことを特徴とするプ
ラスチック管の融着継手。1. A groove having an arc-shaped cross section for reducing stress concentration is provided in the vicinity of a fusion spliced end between a joint and an end of a connected pipe, and an O-ring is mounted in the groove. Plastic tube fusion joint.
JP63285523A 1988-11-11 1988-11-11 Plastic pipe fusion joints Expired - Fee Related JP2864507B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63285523A JP2864507B2 (en) 1988-11-11 1988-11-11 Plastic pipe fusion joints

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63285523A JP2864507B2 (en) 1988-11-11 1988-11-11 Plastic pipe fusion joints

Publications (2)

Publication Number Publication Date
JPH02130129A JPH02130129A (en) 1990-05-18
JP2864507B2 true JP2864507B2 (en) 1999-03-03

Family

ID=17692632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63285523A Expired - Fee Related JP2864507B2 (en) 1988-11-11 1988-11-11 Plastic pipe fusion joints

Country Status (1)

Country Link
JP (1) JP2864507B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2555583A (en) * 2016-10-28 2018-05-09 Peak Pipe Systems Ltd A pipe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5521232A (en) * 1978-07-31 1980-02-15 Mitsubishi Plastics Ind Ltd Hot wire welded joint of polyolefin resin pipe

Also Published As

Publication number Publication date
JPH02130129A (en) 1990-05-18

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