JP2629901B2 - Fusion joint structure of plastic pipe - Google Patents
Fusion joint structure of plastic pipeInfo
- Publication number
- JP2629901B2 JP2629901B2 JP63285521A JP28552188A JP2629901B2 JP 2629901 B2 JP2629901 B2 JP 2629901B2 JP 63285521 A JP63285521 A JP 63285521A JP 28552188 A JP28552188 A JP 28552188A JP 2629901 B2 JP2629901 B2 JP 2629901B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- stress concentration
- fusion
- joint structure
- saddle
- 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 - Lifetime
Links
Landscapes
- Branch Pipes, Bends, And 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構造に関するものである。Description: TECHNICAL FIELD The present invention relates to a fusion joint structure for 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と被
接続管１の外面1aとをそれぞれ加熱して溶融した状態に
して、管端をソケットに押込んで接続している。また、
管に分岐部を設ける場合には、第７〜９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及び管１のサドル本体部７との融着部
表面1dとをそれぞれ加熱して溶融状態にしてから、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 a polyethylene pipe, there is a heat fusion joint method. For example, when connecting a pipe by a socket, as shown in FIG. 5, the inner surface 2a of the socket 2 and the outer surface 1a of the connected pipe 1 are each heated and melted, and the pipe end is pushed into the socket to connect. doing. Also,
In the case where a branch is provided in the pipe, as shown in FIGS. Then, each of the surfaces 1d is heated and melted, and then the saddle 6 is pressed and fused to the tube 1 to form a branch portion. Finally, a branch hole 1c is formed.
［解決しようとする課題］ しかし、ソケット２に管１を押込んだ場合、第６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。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、管１にサドル６を接着した場合にも、第９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、上記と同様な問題が
生ずる。特に、分岐部では、管１にサドル６を融着して
から穴1cをあけているので、融着部に亀裂欠陥が生じや
すいという問題がある。[Problem to be Solved] However, when the tube 1 is pushed into 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. When an internal pressure or an axial force is applied to the pipe 1, stress concentration occurs at the corner C,
Considering long-term use, there is a risk that a crack may occur from this part due to the creep phenomenon peculiar to plastic.
Also, when the saddle 6 is adhered to the tube 1, as shown in FIG. 9, a corner portion C is formed at a fusion portion between the end of the hole 8a of the branch portion 8 of the saddle 6 and the tube 1, The same problem as described above occurs. In particular, since the hole 1c is formed after the saddle 6 is fused to the pipe 1 at the branch portion, there is a problem that a crack defect is easily generated in the fused portion.
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構造は、継手部
材の被接続管との融着接続端部に、応力集中部となるコ
ーナー部が形成されないようにするため、応力集中を軽
減する断面円弧状の溝を設けたことを特徴とするもので
ある。[Means for Solving the Problems] The fusion joint structure for a plastic pipe according to the present invention is to prevent a corner portion serving as a stress concentration portion from being formed at the fusion joint end of the joint member with the connected tube. And a groove having an arc-shaped cross section for reducing stress concentration.
［作用］ 継手部材の被接続管との融着接続端部に、応力集中部
となるコーナー部が形成されないようにするため、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。[Operation] In order to prevent a corner portion serving as a stress concentration portion from being formed at the fusion spliced end of the joint member with the connected pipe, a conventional arc-shaped groove for reducing stress concentration is provided. The problem of stress concentration, which has been a problem, can be solved.
［実施例］ 以下、本発明の１実施例を継手部材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 FIGS. 1 and 2 in which a pipe is connected by a socket 11 as a joint member 10.
ソケット11の内面11aの、被接続管１の押し込み融着
端部に位置して、応力集中を軽減する断面円弧状の溝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、ソケット11への管１の融着は従来と
同様にしてなされる。第２図に、融着接続された状態が
示されている。管１の端部1bが断面円弧状の溝12に滑ら
かに接続されるため、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。A groove 12 having an arc-shaped cross section for reducing stress concentration, which is located on the inner surface 11a of the socket 11 at the pushed-in fused end of the connected tube 1.
Are formed. The radius of curvature of the groove 12 is 8 to 10 mm. The fusion of the tube 1 to the socket 11 is performed in the same manner as in the related art. FIG. 2 shows a state of fusion splicing. Since the end 1b of the tube 1 is smoothly connected to the groove 12 having an arc-shaped cross section, stress concentration at this portion is greatly reduced. That is, the conventional stress concentration coefficient of 2.5 to 3 is changed to 1.2 to
Reduced to 1.5.
次に、継手部材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 member 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溝19が形成されている。サド
ル16は、従来と同様にして、管１に融着される。第４図
に、融着後の状態が示されている。サドル16の穴18a
は、断面円弧状の溝19を介して管１に融着されているの
で、この部分での応力集中を軽減することができる。ま
た、穴1cをあける場合の、亀裂発生を防止することがで
きる。。A groove 19 for reducing stress concentration is formed at the fusion splicing end of the hole 18a of the branch portion 18 of the saddle 16 with the tube 1. Saddle 16 is fused to tube 1 in a conventional manner. FIG. 4 shows the state after fusion. Saddle 16 hole 18a
Is fused to the tube 1 through the groove 19 having an arcuate cross section, so that stress concentration at this portion can be reduced. In addition, it is possible to prevent the occurrence of cracks when drilling the hole 1c. .
［発明の効果］ この発明のプラスチック管の融着継手構造は、上記の
ようなもので、継手部材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。[Effects of the Invention] The fusion joint structure for a plastic pipe of the present invention is as described above, and it is possible to reduce the concentrated stress at the joint of the joint member and the connected pipe.
第１図及び第２図は本発明の継手構造の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（ａ）、（ｂ）は分岐サドルの管軸方向及
び管軸に直交する方向の縦断面図、第４図は第３図の分
岐サドルが被接続管に融着された状態の縦断面図、第５
図及び第６図は従来のソケットと被接続管及びこれらが
融着された状態の縦断面図、第７図は分岐サドルを被接
続管に融着する状況の斜視図、第８図と第９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及び管軸に
直交する方向の縦断面図である。 １……被接続管、10……継手部材、11……ソケット、16
……分岐サドル、12、19……断面円弧状の溝1 and 2 are a longitudinal sectional view of a socket showing a joint structure according to an embodiment of the present invention and a longitudinal sectional view of a state where the socket is fused to a connected pipe. 3 (a) and 3 (b) are longitudinal sectional views of the branch saddle in the pipe axis direction and a direction perpendicular to the pipe axis, and FIG. 4 shows a state where the branch saddle in FIG. 3 is fused to a connected pipe. Longitudinal section, fifth
FIG. 6 and FIG. 6 are longitudinal sectional views showing a conventional socket and a connected pipe and a state in which they are fused, FIG. 7 is a perspective view showing a state in which a branch saddle is fused to the connected pipe, and FIGS. FIG. 9 is a longitudinal sectional view in a pipe axis direction and a direction orthogonal to the pipe axis in a state where the branch saddle is fused to the connected pipe. 1 ... connected pipe, 10 ... joint member, 11 ... socket, 16
…… Branch saddle, 12, 19 …… Groove with circular cross section
Claims (1)
応力集中部となるコーナー部が形成されないようにする
ために、応力集中を軽減する断面円弧状の溝を設けたこ
とを特徴とするプラスチック管の融着継手構造。1. A fusion splicing end of a joint member with a connected pipe,
A fusion joint structure for a plastic pipe, wherein a groove having an arc-shaped cross section for reducing stress concentration is provided to prevent formation of a corner portion serving as a stress concentration portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63285521A JP2629901B2 (en) | 1988-11-11 | 1988-11-11 | Fusion joint structure of plastic pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63285521A JP2629901B2 (en) | 1988-11-11 | 1988-11-11 | Fusion joint structure of plastic pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02134489A JPH02134489A (en) | 1990-05-23 |
| JP2629901B2 true JP2629901B2 (en) | 1997-07-16 |
Family
ID=17692607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63285521A Expired - Lifetime JP2629901B2 (en) | 1988-11-11 | 1988-11-11 | Fusion joint structure of plastic pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2629901B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4326158B2 (en) | 2001-02-08 | 2009-09-02 | 三井化学産資株式会社 | Electric fusion saddle joint |
-
1988
- 1988-11-11 JP JP63285521A patent/JP2629901B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02134489A (en) | 1990-05-23 |
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