JPH0572861B2 - - Google Patents
Info
- Publication number
- JPH0572861B2 JPH0572861B2 JP24637286A JP24637286A JPH0572861B2 JP H0572861 B2 JPH0572861 B2 JP H0572861B2 JP 24637286 A JP24637286 A JP 24637286A JP 24637286 A JP24637286 A JP 24637286A JP H0572861 B2 JPH0572861 B2 JP H0572861B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- threaded
- synthetic resin
- joint
- tapered
- 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
- 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
本発明は繊維強化合成樹脂管の継手部構造に関
する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a joint structure for a fiber-reinforced synthetic resin pipe.
従来の技術
従来、高圧用の繊維強化合成樹脂管（以下、
FRP管という）の継手としては、テーパソケツ
ト、シングルラツプ、ダブルラツプなどの２次接
着方式が採用されているが、２次接着方式は接着
端部にせん断応力が集中するため、接着面積を増
しても耐圧強度に限界があり、このため高圧用継
手としてはねじ式が採用されている。ところで、
このねじ式継手によると、FRP管端部および継
手管端部にテーパねじを形成する必要があるが、
従来、このねじ部は切削加工により形成されたも
のであり、そしてその接続時においては、FRP
管側のねじ部と継手管側のねじ部とが単に螺合さ
れるものであつた。Conventional technology Conventionally, high-pressure fiber-reinforced synthetic resin pipes (hereinafter referred to as
Secondary bonding methods such as tapered sockets, single wraps, and double wraps are used as joints for FRP pipes (FRP pipes), but because shear stress concentrates at the bonded end with the secondary bonding method, even if the bonding area is increased, the pressure resistance will be reduced. There is a limit to its strength, so threaded joints are used as high-pressure joints. by the way,
According to this threaded joint, it is necessary to form a tapered thread at the FRP pipe end and the joint pipe end.
Conventionally, this threaded part was formed by cutting, and when connecting it, FRP
The threaded portion on the tube side and the threaded portion on the joint tube side were simply screwed together.
発明が解決しようとする問題点
上記従来の構成によると、FRP管および継手
管の管本体に直接ねじ山を切削して形成するた
め、ねじ山の部分で強化用繊維が切断され、した
がつて管軸方向の力すなわちせん断力がかかると
非常に弱いという問題があつた。また、その接続
時には、切削精度上、ねじ山同志間に〓間が生じ
るため、せん断力は各ねじ山に均等にかからず、
したがつてねじ山に生じるせん断応力に大小が生
じるという問題がある。Problems to be Solved by the Invention According to the above-mentioned conventional configuration, since the threads are formed by cutting directly into the pipe bodies of the FRP pipe and the joint pipe, the reinforcing fibers are cut at the threads. There was a problem that the force in the tube axis direction, that is, the shear force, was very weak. In addition, when connecting them, due to cutting precision, there is a gap between the threads, so the shearing force is not applied equally to each thread.
Therefore, there is a problem in that the shear stress generated in the threads varies in magnitude.
そこで、本発明は上記問題を解消し得る繊維強
化合成樹脂管の継手部構造を提供することを目的
とする。 Therefore, an object of the present invention is to provide a joint structure for a fiber-reinforced synthetic resin pipe that can solve the above problems.
問題点を解決するための手段
上記問題を解決するため、本発明の繊維強化合
成樹脂管の継手部構造は、強化用繊維が埋込まれ
た合成樹脂管および継手管の端部をテーパ状に切
削加工し、このテーパ部表面に金型を使用してね
じ部を一体成形し、上記合成樹脂管と継手管との
螺合ねじ部間にコーキング材を充填し、かつ上記
ねじ部における材料を、コーキング材のヤング率
よりも大きいヤング率を有するものを使用すると
ともに、上記合成樹脂管および継手管における材
料を、ねじ部における材料のヤング率よりも大き
いヤング率を有するものを使用したものである。Means for Solving the Problems In order to solve the above problems, the joint structure of the fiber-reinforced synthetic resin pipe of the present invention includes a synthetic resin pipe in which reinforcing fibers are embedded and an end of the joint pipe in a tapered shape. After cutting, a threaded part is integrally formed on the surface of this tapered part using a mold, and a caulking material is filled between the threaded parts of the synthetic resin pipe and the joint pipe, and the material in the threaded part is , a caulking material having a Young's modulus greater than that of the caulking material is used, and the material for the synthetic resin pipe and the joint pipe is a material having a Young's modulus greater than that of the material in the threaded portion. be.
作 用
上記構成においては、繊維強化合成樹脂管およ
び継手管の端部をテーパ状に切削加工し、このテ
ーパ部にねじ部を一体成形したので、強化用繊維
が切断されてねじ部内に毛羽立つた状態となるの
で、ねじ部は管本体側に強固に接着されることに
なり、したがつて管軸方向の力が加わつたとして
も十分耐え得る。また合成樹脂管のねじ部と継手
管のねじ部との間に、ヤング率が管本体およびね
じ部より小さいコーキング材を充填するので、そ
の柔らかさによりねじ面に加わるせん断力が均一
化される。Effect In the above structure, the ends of the fiber-reinforced synthetic resin pipe and the joint pipe are cut into a tapered shape, and the threaded part is integrally molded into this tapered part, so that there is no possibility that the reinforcing fibers will be cut and fuzz will form inside the threaded part. As a result, the threaded portion is firmly bonded to the tube main body side, and therefore can sufficiently withstand even if force is applied in the tube axis direction. In addition, a caulking material whose Young's modulus is smaller than that of the pipe body and the threaded part is filled between the threaded part of the synthetic resin pipe and the threaded part of the joint pipe, so its softness equalizes the shear force applied to the threaded surface. .
実施例
以下、本発明の一実施例を図面に基づき説明す
る。Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings.
第３図において、１は強化用繊維としてロービ
ングクロスが使用された繊維強化合成樹脂管（以
下、FRP管という）で、その端部外周が切削工
具２によりテーパ状に切削加工される。このと
き、FRP管１のテーパ部１ａ表面においては、
ロービングクロスが切断されて、その端部が毛羽
たてられた状態となる。なお、第２図に、ロービ
ングクロス３が毛羽３ａ立てられた状態を示す。
次に、第４図に示すように、テーパ部１ａ表面に
金型を用いてねじ部（おねじ）４を合成樹脂によ
り一体成形する。なお、このときの、テーパ部長
さｌとFRP管１の厚み（T1）との関係は(1)式を
満足するようにされる。 In FIG. 3, reference numeral 1 denotes a fiber-reinforced synthetic resin pipe (hereinafter referred to as FRP pipe) in which roving cloth is used as a reinforcing fiber, and the outer periphery of the end thereof is cut into a tapered shape using a cutting tool 2. At this time, on the surface of the tapered part 1a of the FRP pipe 1,
The roving cloth is cut and its ends are fluffed. In addition, FIG. 2 shows a state in which the roving cloth 3 is erected with fluff 3a.
Next, as shown in FIG. 4, a threaded portion (male thread) 4 is integrally molded from synthetic resin on the surface of the tapered portion 1a using a mold. At this time, the relationship between the length l of the tapered portion and the thickness (T 1 ) of the FRP pipe 1 is made to satisfy equation (1).
5T1＜ｌ＜15T1 ……(1)
上記ねじは丸ねじとされるとともにねじ山高さ
は、T1／３以下とされ、またねじ外面はFRP管
１よりも外方に突出しないようにされている。ま
た、第５図に示すように、継手管５の両側内面に
は切削工具によりテーパ部５ａが形成され、この
両テーパ部５ａにもFRP管１と同様にねじ部
（めねじ）６が形成される。なお、このとき、継
手管５の端部厚さ（T2）は下記(2)式を満足する
ようにされる。 5T 1 < l < 15T 1 ...(1) The above screw is a round thread, the thread height is T 1/3 or less, and the outer surface of the screw is made so as not to protrude outward beyond the FRP pipe 1. has been done. Further, as shown in FIG. 5, tapered portions 5a are formed on both inner surfaces of the joint pipe 5 using a cutting tool, and threaded portions (female threads) 6 are formed on both tapered portions 5a similarly to the FRP pipe 1. be done. In addition, at this time, the end thickness (T 2 ) of the joint pipe 5 is made to satisfy the following formula (2).
1.1T1＜T2＜1.5T1 ……(2)
そして、第１図に示すように、２本のFRP管
１Ａ，１Ｂを継手管５により接続する場合、継手
管５のねじ部６に各FRP管１Ａ，１Ｂの端部の
ねじ部４を螺合させ、しかも第２図に示すように
両ねじ部４，６間にはコーキング材（例えばシリ
コン、ゴム類などの粘性を有する樹脂）７が充填
される。ところで、FRP管１および継手管５の
ヤング率をE1、各管のねじ部４，６に使用され
る合成樹脂のヤング率をE2、コーキング材７の
ヤング率をE3とすると、各ヤング率の関係は(3)
式のようになる。 1.1T 1 <T 2 <1.5T 1 ...(2) Then, as shown in Fig. 1, when connecting two FRP pipes 1A and 1B with the joint pipe 5, the threaded part 6 of the joint pipe 5 is The threaded portions 4 at the ends of each FRP pipe 1A, 1B are screwed together, and as shown in FIG. 7 is filled. By the way, if the Young's modulus of the FRP pipe 1 and the joint pipe 5 is E 1 , the Young's modulus of the synthetic resin used for the threaded parts 4 and 6 of each pipe is E 2 , and the Young's modulus of the caulking material 7 is E 3 , each The relationship between Young's modulus is (3)
It becomes like the formula.
E3≪E2＜E1 ……(3)
このようなヤング率にすることによつて、
FRP管１に生じる軸方向の力はねじ部４にスム
ースに伝わり、さらにこのねじ部４からコーキン
グ材７を介して継手管５側のねじ部６にスムース
に伝わる。すなわち、コーキング材７の潤滑性お
よび流動性により、ねじ面に加わるせん断力が均
一化されるとともに、ねじ部４，６を形成する数
mm厚さの合成樹脂層がロービングクロス界面に伝
わるせん断力を緩和させる。これにより、ねじ面
の公称せん断応力で１Kgｆ／mm2を超えるねじ強度
が得られる。 E 3 ≪E 2 <E 1 ...(3) By setting Young's modulus like this,
The axial force generated in the FRP pipe 1 is smoothly transmitted to the threaded portion 4, and from this threaded portion 4 via the caulking material 7 to the threaded portion 6 on the joint pipe 5 side. In other words, the lubricity and fluidity of the caulking material 7 equalizes the shear force applied to the threaded surfaces, and also reduces the number of threads forming the threaded parts 4 and 6.
The mm-thick synthetic resin layer alleviates the shear force transmitted to the roving cloth interface. As a result, a screw strength exceeding 1 Kgf/mm 2 can be obtained at the nominal shear stress of the screw surface.
次に、FRP管のねじ部の成形方法を第６図に
基づき説明する。まず、内面にテーパ状にねじ部
１１ａが形成された環状すなわち一体型の金型１
１を、FRP管１のテーパ部１ａに外嵌させた後、
FRP管１内部に管支持用の柱状体１２を金型１
１側から挿入するとともに、そのフランジ部１２
ａを金型１１側にボルト１３により固定する。次
に、注入穴１４より金型１１内面に合成樹脂を高
圧注入（約200Kgｆ／cm2）してねじ山をFRP管１
のテーパ部外周面に形成する。なお、注入後の合
成樹脂の固化を促進するために、金型１１にヒー
タ１５が内蔵されている。 Next, a method for forming the threaded portion of the FRP pipe will be explained based on FIG. 6. First, an annular or one-piece mold 1 with a tapered threaded portion 11a formed on the inner surface.
1 is fitted onto the tapered part 1a of the FRP pipe 1,
A columnar body 12 for supporting the pipe is placed inside the FRP pipe 1 in the mold 1.
1 side, and the flange part 12
A is fixed to the mold 11 side with bolts 13. Next, synthetic resin is injected at high pressure (approximately 200 kgf/cm 2 ) into the inner surface of the mold 11 through the injection hole 14 to tighten the threads into the FRP pipe 1.
Formed on the outer peripheral surface of the tapered part. Note that a heater 15 is built into the mold 11 in order to promote solidification of the synthetic resin after injection.
次に、継手管のねじ部の成形方法を第７図に基
づき説明する。まず、テーパ状外周面にねじ部１
６ａが形成された円柱状金型１６を継手管５の両
側から内部に挿入するとともに、そのフランジ部
１６ｂに形成された環状突部１６ｃを継手管５外
周面に嵌合させる。この状態において、継手管５
内周面と金型１６のねじ部１６ａ外周面との間に
適正なめねじ形成用の空間が形成され、また両側
から挿入された互いの金型１６Ａ，１６Ｂ先端同
志が密着している。次に、両金型１６Ａ，１６Ｂ
が継手管５から離れないように例えば保持具によ
り固定した後、一方の金型１６Ｂの注入穴１７か
ら合成樹脂を高圧注入（約200Kgｆ／cm2）してね
じ部６を継手管５のテーパ部５ａ内周面に形成す
る。この場合も、上記同様に、金型１６Ａ，１６
Ｂ内にヒータ（図示せず）が内蔵されている。こ
のように、金型１１，１６は一体型を使用してい
るため、半割型のものに比べて、成形精度が高
い。半割型であると、どうしても合わせ部にずれ
が生じ、シール性能低下の原因となる。なお、脱
型時には、金型１１，１６を回転させる必要があ
るため、離型剤が使用される。 Next, a method for forming the threaded portion of the joint pipe will be explained based on FIG. 7. First, the threaded portion 1 is attached to the tapered outer peripheral surface.
The cylindrical mold 16 in which the mold 6a is formed is inserted into the joint tube 5 from both sides, and the annular protrusion 16c formed on the flange portion 16b is fitted onto the outer peripheral surface of the joint tube 5. In this state, the joint pipe 5
A space for forming an appropriate internal thread is formed between the inner peripheral surface and the outer peripheral surface of the threaded portion 16a of the mold 16, and the tips of the molds 16A and 16B inserted from both sides are in close contact with each other. Next, both molds 16A and 16B
After fixing it with a holder, for example, so that it does not separate from the joint pipe 5, synthetic resin is injected at high pressure (approximately 200 kgf/cm 2 ) from the injection hole 17 of one mold 16B to tighten the threaded part 6 into the taper of the joint pipe 5. It is formed on the inner peripheral surface of the portion 5a. In this case as well, the molds 16A, 16
A heater (not shown) is built in B. In this way, since the molds 11 and 16 are integral molds, the molding accuracy is higher than that of half-split molds. If it is a half-split type, misalignment will inevitably occur in the mating portion, causing a reduction in sealing performance. Note that during demolding, it is necessary to rotate the molds 11 and 16, so a mold release agent is used.
発明の効果
上記本発明の構成によると、繊維強化合成樹脂
管および継手管の端部をテーパ状に切削加工し、
このテーパ部にねじ部を一体成形したので、強化
用繊維が切断されてねじ部内に毛羽立つた状態と
なるので、ねじ部は管本体側に強固に接着される
ことになり、したがつて管軸方向の力が加わつた
としても十分耐え得る。また合成樹脂管のねじ部
と継手管のじ部との間に、ヤング率が管本体およ
びねじ部より小さいコーキング材を充填するの
で、その柔らかさによりねじ面に加わるせん断力
が均一化される。Effects of the Invention According to the configuration of the present invention described above, the ends of the fiber-reinforced synthetic resin pipe and the joint pipe are cut into a tapered shape,
Since the threaded part is integrally molded into this tapered part, the reinforcing fibers are cut and become fluffy inside the threaded part, so the threaded part is firmly bonded to the tube body, and therefore the tube axis It can withstand even if a directional force is applied. In addition, a caulking material whose Young's modulus is smaller than that of the pipe body and the threaded part is filled between the threaded part of the synthetic resin pipe and the joint part, so the shear force applied to the threaded surface is equalized due to its softness. .
図面は本発明の一実施例を示すもので、第１図
は接続状態を示す全体断面図、第２図は第１図の
要部拡大図、第３図はFRP管のテーパ部形成状
態を示す断面図、第４図はFRP管のねじ部の断
面図、第５図は継手管のねじ部の断面図、第６図
はFRP管のねじ部成形時における断面図、第７
図は継手管のねじ部成形時における断面図であ
る。
１，１Ａ，１Ｂ……FRP管（繊維強化合成樹
脂管）、１ａ……テーパ部、２……切削工具、３
……ロービングクロス、３ａ……毛羽、４……ね
じ部、５……継手管、５ａ……テーパ部、６……
ねじ部、７……コーキング材、１１……金型、１
１ａ……ねじ部、１６，１６Ａ，１６Ｂ……円柱
状金型、１６ａ……ねじ部。
The drawings show one embodiment of the present invention; Fig. 1 is an overall cross-sectional view showing a connected state, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 shows a state in which a tapered part of an FRP pipe is formed. Figure 4 is a cross-sectional view of the threaded part of the FRP pipe, Figure 5 is a cross-sectional view of the threaded part of the joint pipe, Figure 6 is a cross-sectional view of the threaded part of the FRP pipe during forming, and Figure 7 is a cross-sectional view of the threaded part of the FRP pipe.
The figure is a cross-sectional view of the threaded portion of the joint tube when it is formed. 1, 1A, 1B...FRP pipe (fiber reinforced synthetic resin pipe), 1a...Tapered part, 2...Cutting tool, 3
...Roving cloth, 3a...Fuzz, 4...Threaded part, 5...Joint pipe, 5a...Tapered part, 6...
Threaded part, 7...Caulking material, 11...Mold, 1
1a... Threaded portion, 16, 16A, 16B... Cylindrical mold, 16a... Threaded portion.
Claims (1)
手管の端部をテーパ状に切削加工し、このテーパ
部表面に金型を使用してねじ部を一体成形し、上
記合成樹脂管と継手管との螺合ねじ部間にコーキ
ング材を充填し、かつ上記ねじ部における材料
を、コーキング材のヤング率よりも大きいヤング
率を有するものを使用するとともに、上記合成樹
脂管および継手管における材料を、ねじ部におけ
る材料のヤング率よりも大きいヤング率を有する
ものを使用したことを特徴とする繊維強化合成樹
脂管の継手部構造。1 The ends of the synthetic resin pipe and the joint pipe in which reinforcing fibers are embedded are cut into a tapered shape, and a threaded part is integrally molded on the surface of this tapered part using a mold, and the synthetic resin pipe and the joint A caulking material is filled between the threaded portions of the pipe, and a material having a Young's modulus greater than the Young's modulus of the caulking material is used for the threaded portions, and the materials for the synthetic resin pipes and joint pipes are A joint structure for a fiber-reinforced synthetic resin pipe, characterized in that a material having a Young's modulus greater than that of the material in the threaded portion is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24637286A JPS6398423A (en) | 1986-10-15 | 1986-10-15 | Joint structure of fiber-reinforced synthetic resin pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24637286A JPS6398423A (en) | 1986-10-15 | 1986-10-15 | Joint structure of fiber-reinforced synthetic resin pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6398423A JPS6398423A (en) | 1988-04-28 |
| JPH0572861B2 true JPH0572861B2 (en) | 1993-10-13 |
Family
ID=17147563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24637286A Granted JPS6398423A (en) | 1986-10-15 | 1986-10-15 | Joint structure of fiber-reinforced synthetic resin pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6398423A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2926118B1 (en) * | 2008-01-04 | 2010-01-29 | Snecma | COMPOSITE FLANGE WITH MACHINING PART. |
-
1986
- 1986-10-15 JP JP24637286A patent/JPS6398423A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6398423A (en) | 1988-04-28 |
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