JPS6398423A - Joint structure of fiber-reinforced synthetic resin pipe - Google Patents
Joint structure of fiber-reinforced synthetic resin pipeInfo
- Publication number
- JPS6398423A JPS6398423A JP24637286A JP24637286A JPS6398423A JP S6398423 A JPS6398423 A JP S6398423A JP 24637286 A JP24637286 A JP 24637286A JP 24637286 A JP24637286 A JP 24637286A JP S6398423 A JPS6398423 A JP S6398423A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- synthetic resin
- frp
- joint pipe
- thread
- 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.)
- Granted
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 26
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000004744 fabric Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
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] Industrial applications The present invention relates to a structure of a joint portion of 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、テーバソケット、シングルラッ
プ、ダブルラップなどの２次接着方式が採用されている
が、２次接着方式は隈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υ、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シ形成されたものであシ、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った。Conventional technology Traditionally, secondary bonding methods such as Taber socket, single wrap, and double wrap have been used as joints for high-pressure fiber-reinforced synthetic resin pipes (hereinafter referred to as FRP pipes). Because shear stress concentrates at the edge of the joint, there is a limit to the pressure resistance even if the bonding area is increased.For this reason, screw-type 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 end of the FRP pipe and the end of the joint pipe, but conventionally, this threaded part was formed by cutting. At the time of connection, the threaded portion on the FRP pipe side and the threaded portion on the joint pipe 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
体に直妾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、したがっ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った
。また、その接続時には、切削精度上、ねじ山同志間に
隙間が生じるため、せん断力は各ねじ山に均等にかから
ず、しだがっ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 straight threads are formed by cutting into the pipe bodies of FRP pipes and joint pipes, the reinforcing fibers are cut at the threads, and therefore the pipes are damaged. There was a problem in that it was very weak when axial force, that is, shear force was applied. In addition, when connecting them, due to cutting accuracy, gaps are created between the threads, so the shear force is not applied equally to each thread, which causes the problem that the shear stress generated on the threads varies in magnitude. be.
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 cutting the synthetic resin pipe in which reinforcing fibers are embedded and the ends of the joint pipe into a tapered shape. Processing, integrally molding a threaded part on the surface of this tapered part using a mold, filling a caulking material between the threaded parts of the synthetic resin pipe and the joint pipe, and adding the material in the threaded part, In addition to using a caulking material that has a Young's modulus larger than that of the caulking material, the materials for the synthetic resin pipes and joint pipes are
A material having a Young's modulus greater than that of the material in the threaded portion is used.
作 用
上記構成においては、繊維１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
内に毛羽立った状態となるので、ねじ部は管本体側に強
固に接着されることになシ、したがって管軸方向の力が
加わっ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
らかさによシ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-1 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 the reinforcing fibers are cut and fluff is formed inside the threaded part. As a result, the threaded portion is firmly bonded to the tube 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 the shearing force applied to the threaded surface is uniformized due to its softness. be done.
実権例 以下、本発明の一実施例を図面に基づき説明する。example of real power Hereinafter, one 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（４〕
ロス（３）が毛羽（３ａ〕立てられた状態を示す。次Ｋ
、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、テーパ部長さくＩりとＦＲ
Ｐ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 Figure 3, (1) is a fiber-reinforced synthetic resin pipe (hereinafter referred to as FRP) in which roving cloth is used as reinforcing fiber.
The outer periphery of the end of the tube is cut into a tapered shape using a cutting tool (2). At this time, the roving cloth is cut on the surface of the tapered part (1a) of the FRP pipe (1), and the ends thereof are fluffed. In addition, Fig. 2 shows the state in which the roving (4) loss (3) is fluffed (3a).Next K
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. In addition, at this time, the taper part thickness I and FR
The relationship with the thickness (T1) of the P tube (1) is made to satisfy equation (1).
５Ｔ、＜ｆ＜１５Ｔ、 ・・・・・・・−・・・・・
・・・・・・・・ （１）上記ねじは丸ねじとされると
ともにねじ山高さは、Ｔ、／３以下とされ、またねじ外
面はＦＲＰ管（１）よシも外方に突出しないようされて
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シテーバ部（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）の端部厚さくＴ２）は下記（２）式を満足
するようにされる。5T, <f<15T, ・・・・・・・・・－・・・・・・
・・・・・・・・・ (1) The above screw is a round screw, the thread height is T, /3 or less, and the outer surface of the screw does not protrude outward from the FRP pipe (1). That's how it is. In addition, as shown in FIG. 5, a cutter bar portion (5a) is formed on the inner surface of both sides of the joint pipe (5) using a cutting tool.
Both tapered portions (5a) are also formed with threaded portions (female threads) (6) similarly to the FRP pipe (1). Furthermore, at this time,
The end thickness T2) of the joint pipe (5) is made to satisfy the following formula (2).
ＬＩ Ｔ、 ＜Ｔ２＜ １．５ Ｔ、 ・・・・・・
・・・・・・・・・・・・ （２）そして、第１図に示
すように、２本のＦＲＰ管（ＩＡ）（ＩＢ）を継手管（
５）によシ接続する場合、継手管（５）のねじ部（６）
に各ＦＲＰ管ＣＩＡ）（ＩＢ）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Ｅ４．
６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。LI T, <T2< 1.5 T, ...
・・・・・・・・・・・・ (2) Then, as shown in Figure 1, connect the two FRP pipes (IA) (IB) to the joint pipe (
5) In case of two-way connection, the threaded part (6) of the joint pipe (5)
The threaded portion (4) at the end of each FRP pipe CIA)(IB) is screwed together, and both threaded portions (4)(
6) A caulking material (for example, a viscous resin such as silicone or rubber) (7) is filled in the space. by the way,
The Young's modulus of the FRP pipe (1) and the joint pipe (5) is E4.
6 If the Young's modulus of the synthetic resin used for the threaded parts (4) and (6) of the pipe is E2, and the Young's modulus of the caulking material (7) is E3, then the relationship between each Young's modulus is as shown in equation (3). .
Ｅ５（Ｅ２〈Ｅ、 ・・・・・・・・・・・・・・・
・・・・・・・・・ （３）このようなりフグ率にする
ことによって、ＦＲＰ管（１）に生じる軸方向の力はね
じ部（４）にスムースに伝わシ、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ｎ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。これによし、ねじ
面の公称せん断応力で１ｋｇｆ／−を超えるねじ強度が
得られる。E5 (E2〈E, ・・・・・・・・・・・・・・・
(3) By setting the blow rate like this, the axial force generated in the FRP pipe (1) can be smoothly transmitted to the threaded part (4), and this threaded part (4) can be smoothly transmitted to the threaded part (4). 4
) through 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 surface, and the threaded portion (4) (6
), the synthetic resin layer with a thickness of several n reduces the shear force transmitted to the roving cloth interface. Accordingly, a screw strength exceeding 1 kgf/- 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（Ｉｌａ）が形
成された環状すなわち一体型の金型ａυ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（２）を金型（６）側から挿
入するとともに、そのフランジ部（１２ａ）を金型σ刀
側にボルト（至）によシ固定する。次に、注入穴α荀よ
シ金型（ロ）内面に合成樹脂を高圧注入（約２００ｋｇ
ｆ／ｄ ） してねじ山をＦＲＰ ９ （１）のテーパ
部外周面に形成する。Next, a method for forming the threaded portion of the FRP pipe will be explained based on FIG. 6. First, an annular or integral mold aυ with a tapered threaded portion (Ila) formed on the inner surface is placed into an FRP pipe (
After fitting onto the tapered part (1a) of FRP pipe (1),
) A columnar body (2) for supporting the tube is inserted into the interior from the mold (6) side, and its flange portion (12a) is fixed to the mold side with bolts. Next, synthetic resin was injected at high pressure (approximately 200 kg) into the inner surface of the injection hole α side mold (b).
f/d) to form a thread on the outer peripheral surface of the tapered part of FRP 9 (1).
なお、注入後の合成樹脂の固化を促進するために、金型
α℃にヒータＱ９が内蔵されている。In addition, in order to promote solidification of the synthetic resin after injection, a heater Q9 is built into the mold α°C.
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、テーパ伏外周面にねじ部（１６ａ）が形成
された円柱状金型αＱ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Ｑ
ｅ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
、両全型（１６ＡＸ１６Ｂ）が継手ｇ（５）から離れな
いように例えば保持具によシ固定した後、一方の金型（
１６Ｂ）の注入穴〇ηから合成樹脂を高圧注入（約２０
０ｋｇｆ／ｃＷｌ） 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）（１６Ｂ）内にヒータ（図示
せず）が内蔵されている。このように、金型−ＯＱ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（９）αＱ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, a cylindrical mold αQ with a threaded portion (16a) formed on the tapered outer peripheral surface is inserted into the joint pipe (5) from both sides, and an annular protrusion ( 16c) is fitted onto the outer peripheral surface of the joint pipe (5). In this state, the inner peripheral surface of the joint pipe (5) and the mold Q
A space for forming an appropriate internal thread is formed between the outer peripheral surface of the threaded portion (16a) of e, and the tips of the molds (16A) and (16B) inserted from both sides are in close contact with each other. Next, after fixing both molds (16AX16B) with a holder, for example, so that they do not separate from the joint g (5), one mold (
16B) High pressure injection of synthetic resin from the injection hole〇η (approximately 20
0kgf/cWl) and connect the threaded part (6) to the joint pipe (5).
The tapered portion (5a) is formed on the inner peripheral surface. In this case as well, heaters (not shown) are built into the molds (16A) (16B), as described above. In this way, since the mold-OQ uses an integral mold, the molding accuracy is higher than that of a half-split mold. 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 mold (9) αQ, 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
じ部内に毛羽立った状態となるので、ねじ部は管本体側
に強固に接着されることになシ、したがって管軸方向の
力が加わっ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
の柔らかさによシ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 above structure of the present invention, 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 the tapered part, so that the reinforcing fibers are cut and the threaded part is formed. Since the inside of the threaded part is fluffed, the threaded part is not firmly bonded to the tube body, and therefore can sufficiently withstand even if force is applied in the axial direction of the tube. 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 the shear force applied to the threaded surface is uniformized due to its softness. be done.
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′ｆ！Ａ成形時における
断面図である。
（１）（ＩＡ）（ＩＢ）−ＦＲＰ Ｗ （＊ｍ’Ｗｉ化
合ｅ、ｍ脂９ ）、（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、α刀・・・金型、（ｌｌａ）
・・・ねじ部、αｆ３ （１６ＡＸ１６Ｂ）・・・円柱
状金型、（１６ａ）・・・ねじ部。
代理人 森 本 義 弘荀 聾
勺／？） ”Ｑ トThe drawings show one embodiment of the present invention; FIG. 1 is an overall sectional view showing a connection state, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. Sectional view shown, No. 4
The figure 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 the thread 'f! of the joint pipe. It is a sectional view at the time of A molding. (1) (IA) (IB)-FRP W (*m'Wi compound e, m fat 9), (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, alpha sword...mold, (lla)
...Threaded part, αf3 (16AX16B)...Cylindrical mold, (16a)...Threaded part. Agent Yoshihiro Morimoto Hiroson Deaf/? ) ”Q
Claims (1)
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. Cut the ends of the synthetic resin pipe and the joint pipe in which reinforcing fibers are embedded into a tapered shape, use a mold to integrally mold the threaded part on the surface of the tapered part, and then combine the synthetic resin pipe with the above synthetic resin pipe. A caulking material is filled between the threaded parts of the joint pipe, and a material having a Young's modulus larger than that of the caulking material is used for the threaded parts. 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 true JPS6398423A (en) | 1988-04-28 |
| JPH0572861B2 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009184348A (en) * | 2008-01-04 | 2009-08-20 | Snecma | Composite coupling having machining portion |
-
1986
- 1986-10-15 JP JP24637286A patent/JPS6398423A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009184348A (en) * | 2008-01-04 | 2009-08-20 | Snecma | Composite coupling having machining portion |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0572861B2 (en) | 1993-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2246469C (en) | Clean air ducts and methods for the manufacturing thereof | |
| US3462175A (en) | Connector for unthreaded pipe,and method of making the same | |
| US4790573A (en) | Sealing system between a metal insert and plastic coupling, and resulting product | |
| US4229028A (en) | Pipe coupler | |
| JP2588676B2 (en) | Non-ceramic insulator forming equipment | |
| US10519659B2 (en) | Methods and apparatuses for connecting concrete structural elements | |
| JPS63115991A (en) | Piping connecting joint made of plastic | |
| JPS6398423A (en) | Joint structure of fiber-reinforced synthetic resin pipe | |
| CN113932074B (en) | High-pressure connecting joint of steel wire mesh reinforced composite pipe and manufacturing method thereof | |
| CN107817561A (en) | Fiber optic connector assembly, joints of optical fibre tail sleeve and its prepare mould and preparation method | |
| CN110258933B (en) | Split sleeve connecting structure, sleeve and construction method | |
| JPS642048B2 (en) | ||
| JPH01264834A (en) | Core mold for molding pipe joint | |
| JP3714427B2 (en) | Integrated bracket engine mount | |
| CN215106608U (en) | Novel connecting grouting sleeve assembly | |
| JPH04258519A (en) | Synthetic resin bolt with core bar and its manufacture | |
| CN212435266U (en) | PE threading pipe of convenient concatenation | |
| JPS63186075A (en) | Valve box seat fixing structure | |
| JPH0115988Y2 (en) | ||
| JPH0115989Y2 (en) | ||
| JPH0524730Y2 (en) | ||
| KR100413643B1 (en) | A connecter of plastics pipe | |
| KR970006115Y1 (en) | Steel bar joint for steel reinforcing concrete | |
| JPS6398407A (en) | Method and apparatus for molding fiber reinforced synthetic resin pipe | |
| JP2810989B2 (en) | Joining method of fiber reinforced plastic bar |