JP2620177B2 - Flexible joint - Google Patents
Flexible jointInfo
- Publication number
- JP2620177B2 JP2620177B2 JP4283672A JP28367292A JP2620177B2 JP 2620177 B2 JP2620177 B2 JP 2620177B2 JP 4283672 A JP4283672 A JP 4283672A JP 28367292 A JP28367292 A JP 28367292A JP 2620177 B2 JP2620177 B2 JP 2620177B2
- Authority
- JP
- Japan
- Prior art keywords
- flexible
- joint
- angle
- young
- modulus
- 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
Links
Landscapes
- Joints With Sleeves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は電気ケーブル外筒管、通
水管等の地中管の可撓継手に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible joint for an underground pipe such as an electric cable outer pipe, a water pipe, or the like.
【０００２】[0002]
【従来の技術】近年電気ケーブル外筒管等の地中管の普
及につれてこれらの地中管についても地震等による地盤
変化に対処しうる可撓継手に対する需要が増大してい
る。電気ケーブル外筒管用の継手として従来のゴム製可
撓継手を使用すると、この種の継手は剪断変形するため
ケーブルの断線を生じるおそれがあり適当ではない。ま
た電気ケーブル外筒管等の継手としては、実開平２−２
１３８９号公報に記載された可撓継手がある。この可撓
継手は、円筒体の両端部に管路差込み部、中央部に可撓
部を形成してなる繊維強化プラスチック製の可撓継手で
あって、可撓部内周面に差込み部内周面より内方へ突出
した少くとも２本の突条を適宜の間隔をおいて全周にわ
たり形成したものである。2. Description of the Related Art In recent years, as underground pipes such as electric cable outer pipes have become widespread, demand for flexible joints that can cope with ground changes due to earthquakes and the like has been increasing for these underground pipes. If a conventional rubber flexible joint is used as a joint for an electric cable outer tube, this type of joint is likely to be subjected to shear deformation, which may cause disconnection of the cable, which is not appropriate. In addition, as joints such as electric cable outer tube, actual open flat 2-2 is used.
There is a flexible joint described in 1389. This flexible joint is a fiber-reinforced plastic flexible joint formed by forming a pipe insertion portion at both ends of a cylindrical body and a flexible portion at the center, and has an insertion portion inner peripheral surface at the flexible portion inner peripheral surface. At least two ridges projecting more inward are formed over the entire circumference at appropriate intervals.
【０００３】[0003]
【発明が解決しようとする課題】上記実開平２−２１３
８９号公報記載の可撓継手は許容可撓角が２０°であ
り、接続する管の長さが２ｍの場合地盤の沈下量７００
ｍｍを吸収しうるものとされている。しかしながら、可
撓角が２０°近くになるとこの継手の可撓部の変形は座
屈変形となり、圧縮側がつぶれて曲る形で変形する。し
たがって大きな地震等で地盤が大きく振動した場合いっ
たん座屈変形が生じると、地震が終って地盤が原状に復
帰しても継手は原状に戻ることはできず、変形した状態
で留まるという不都合が生じる。SUMMARY OF THE INVENTION
The flexible joint described in Japanese Patent No. 89 has an allowable flexible angle of 20 ° and a ground subsidence amount 700 when the connecting pipe length is 2 m.
mm can be absorbed. However, when the flexible angle is close to 20 °, the deformation of the flexible portion of the joint becomes a buckling deformation, and the compression side is deformed in a crushed and bent shape. Therefore, if the ground vibrates greatly due to a large earthquake, once the buckling deformation occurs, the joint cannot return to the original state even if the ground ends and the ground returns to the original state, causing the inconvenience of staying deformed .
【０００４】本発明は、上記従来の可撓継手の問題点に
かんがみなされたものであって、２０°以上の許容可撓
角を有し、しかも可撓角が２０°に達してもなお弾性変
形を行うことが可能であり、したがって地震等による地
盤の振動が終了した後原状に復帰することができる可撓
継手を提供しようとするものである。The present invention has been made in view of the above-mentioned problems of the conventional flexible joint, and has an allowable flexible angle of 20 ° or more, and even if the flexible angle reaches 20 °, the elasticity is still high. An object of the present invention is to provide a flexible joint that can be deformed, and thus can return to its original state after ground vibration due to an earthquake or the like ends.
【０００５】[0005]
【課題を解決する手段】本発明者らは研究と実験を重ね
た結果、この種の可撓継手を硬質プラスチックの中曲げ
試験におけるヤング率が特定の範囲内にあり、かつ一定
値以上の伸びを有するものによって形成した継手は２０
°以上の許容可撓角を有しながら可撓角が２０°に達し
てもなお弾性変形を行うことが可能であり、本発明の目
的を達成することが可能であることを見出して本発明に
到達した。As a result of repeated studies and experiments, the present inventors have found that this type of flexible joint has a Young's modulus in a medium bending test of a hard plastic within a specific range and has an elongation exceeding a certain value. The joint formed by having
It has been found that even if the flexible angle reaches 20 ° while having an allowable flexible angle of not less than 20 °, it is still possible to perform elastic deformation, and it is possible to achieve the object of the present invention. Reached.
【０００６】すなわち上記目的を達成する本発明の可撓
継手は、円筒体の両端部に管接続部、中央部に可撓部を
有する可撓継手であって、ＪＩＳ Ｋ ７２０３の曲げ
試験によるヤング率が１，０００ｋｇ／ｃｍ2 〜５，０
００ｋｇ／ｃｍ2 の範囲内にありかつＪＩＳ Ｋ ７１
１３の引張試験による伸びが１００％以上である硬質プ
ラスチックまたは硬質ゴムによりその主要部を形成した
ことを特徴とする。That is, the flexible joint of the present invention which achieves the above object is a flexible joint having a pipe connecting portion at both ends of a cylindrical body and a flexible portion at the center, and is a Young's joint obtained by a bending test of JIS K7203. rate is 1,000kg / cm 2 ~5,0
Within the range of 00 kg / cm 2 and JIS K71
13 is characterized in that its main part is formed of hard plastic or hard rubber whose elongation by a tensile test is 100% or more.
【０００７】このような特性を有する硬質プラスチック
または硬質ゴムとしては、特に硬質ウレタンが好適な材
料である。As a hard plastic or hard rubber having such properties, hard urethane is a particularly preferable material.
【０００８】実験の結果、ヤング率が１，０００ｋｇ／
ｃｍ2 未満の場合可撓性が過剰であり、比較的に小さい
荷重でも容易に２０°以上の可撓角に達するが比較的に
大きい土荷重が作用した場合はゴム製可撓継手と同様に
剪断変形を生じ好ましくないことが判った。このことか
ら本用途の可撓継手は曲げ抵抗の最少モーメントを曲げ
９°で２５０ｋｇ−ｍ以上（１ｍ支持で１，０００ｋｇ
以上）としている。この抵抗モーメントに対して実験で
はヤング率２，０００ｋｇ／ｃｍ2 （ｔ1 ＝２２，ｔ2
＝１８）の材質が必要となるがｔ1 ，ｔ2 を厚くするこ
とによって（ｔ1 ＝３５，ｔ2 ＝２８）ヤング率１，０
００ｋｇ／ｃｍ2 の材質でも対応可能である。但しこれ
以上厚さを厚くすることは近接管との間隔から困難であ
ると思われる。またヤング率が５，０００ｋｇ／ｃｍ2
を超えると可撓角２０°に達する以前に継手は破壊する
か破壊しなくても座屈変形を生じることが判った。 ま
た継手の破壊を生じることなく弾性変形により可撓角２
０°の曲げを実現するためにはヤング率が上記範囲にあ
ることに加えてＪＩＳ Ｋ ７１１３の引張試験方法に
よる伸びがおよそ１００％以上の物性をもった材質でな
ければならないことが判った。As a result of the experiment, the Young's modulus was 1,000 kg /
If it is less than 2 cm, the flexibility is excessive, and it can easily reach a flexible angle of 20 ° or more even with a relatively small load. Shear deformation was found to be undesirable. From this fact, the flexible joint of this application has a minimum moment of bending resistance of 250 kg-m or more at bending of 9 ° (1,000 kg at 1 m support).
Above). In this experiment, Young's modulus 2,000 kg / cm 2 (t1 = 22, t2
= 18), but by increasing the thicknesses of t1 and t2 (t1 = 35, t2 = 28), the Young's modulus 1,0
A material of 00 kg / cm 2 can be used. However, it seems that it is difficult to increase the thickness further from the distance from the adjacent tube. The Young's modulus is 5,000 kg / cm 2
It was found that when the flex angle exceeded 20 °, the joint broke or did not break before reaching the flexible angle of 20 °. In addition, the flexible angle 2
In order to realize 0 ° bending, it was found that the material must have physical properties such that the Young's modulus is in the above range and the elongation by the tensile test method of JIS K 7113 is about 100% or more.
【０００９】[0009]
【作用】ヤング率が１，０００ｋｇ／ｃｍ2 〜５，００
０ｋｇ／ｃｍ2 の範囲内にあり、かつ伸びが１００％以
上である硬質プラスチックにより継手の主要部を形成す
ることにより、２０°の許容可撓角が得られた上に、可
撓角２０°において継手可撓部はなお弾性変形を行い荷
重を取去った後原状に復帰する。[Action] The Young's modulus is 1,000 kg / cm 2 to 5,000.
By forming the main part of the joint with a hard plastic having a range of 0 kg / cm 2 and an elongation of 100% or more, an allowable flexible angle of 20 ° was obtained and a flexible angle of 20 ° was obtained. In, the joint flexible portion is still elastically deformed and returns to its original shape after removing the load.
【００１０】[0010]
【実施例】以下添付図面を参照して本発明の実施例につ
いて説明する。図１は本発明にかかる可撓継手の１実施
例の一部縦断正面図である。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially longitudinal front view of an embodiment of a flexible joint according to the present invention.
【００１１】図１に示す可撓継手１はＪＩＳ Ｋ ７２
０３によるヤング率が２，７００ｋｇ／ｃｍ2 、ＪＩＳ
Ｋ ７１１３による伸びが１００％の硬質ウレタンの
注型成形品からなり、全体として円筒形であって、その
両端部に管接続部２，２が、また中央に可撓部３が形成
されている。可撓部３と管接続部２，２との間には段差
が形成されており、可撓部３の内周面は管接続部２，２
の内周面よりも内方に突出している。また可撓部３の外
周面には２本の溝３ａ，３ａが全周にわたり形成されて
いる。The flexible joint 1 shown in FIG.
Young's modulus according to 03 is 2,700 kg / cm 2 , JIS
It consists of a cast product of hard urethane with an elongation of 100% by K 7113, which is cylindrical in its entirety, with pipe connections 2 and 2 at both ends and a flexible portion 3 at the center. . A step is formed between the flexible part 3 and the pipe connection parts 2, 2, and the inner peripheral surface of the flexible part 3 is connected to the pipe connection parts 2, 2.
Protrudes inward from the inner peripheral surface. Two grooves 3a, 3a are formed on the outer peripheral surface of the flexible portion 3 over the entire circumference.
【００１２】可撓部３の溝３ａにおける肉厚ｔ１は可撓
部に必要な強度および可撓性を考慮して決定されるが、
可撓角２０°を得るための強度および可撓性から計算し
て管接続部３の肉厚ｔ２に対し０．８倍〜１．３倍の範
囲内の値に設定することが好ましい。The thickness t1 of the groove 3a of the flexible portion 3 is determined in consideration of the strength and flexibility required for the flexible portion.
It is preferable to set a value within a range of 0.8 to 1.3 times the thickness t2 of the pipe connection portion 3 by calculating from the strength and flexibility for obtaining a flexible angle of 20 °.
【００１３】管接続部２，２は可撓部３よりも大径の内
周面を有し、管４，４が挿入されるようになっている。
管接続部２，２の各開放端側にはＦＲＰ等からなる環状
の拡径防止用補強材５，５が埋設されている。また挿入
される管との間の止水のために管接続部２，２の各開放
端側内周面には複数のリップ部６ａ，６ａを有する環状
止水パッキン６，６が取付けられ、可撓部３と隣接する
端部の内周面には断面矩形の環状止水パッキン７，７が
取付けられている。The tube connecting portions 2 and 2 have an inner peripheral surface having a larger diameter than the flexible portion 3 so that the tubes 4 and 4 can be inserted.
Annular reinforcing members 5 and 5 made of FRP or the like are embedded in the open ends of the pipe connecting portions 2 and 2, respectively. In order to stop water from being inserted into the pipe, annular water-stop packings 6, 6 having a plurality of lips 6a, 6a are attached to the inner peripheral surfaces of the open ends of the pipe connecting sections 2, 2. An annular waterproof packing 7 having a rectangular cross section is attached to the inner peripheral surface of the end portion adjacent to the flexible portion 3.
【００１４】上記構造の実施例における荷重と可撓角と
の関係について行った実験の結果を比較例についての実
験の結果とともに図２に示す。この実験において使用し
た可撓継手の寸法は次のとおりである。FIG. 2 shows the result of an experiment conducted on the relationship between the load and the flexible angle in the embodiment of the above structure together with the result of the experiment on the comparative example. The dimensions of the flexible joint used in this experiment are as follows.
【００１５】 全長 ４４５ｍｍ 可撓部３の長さ １２５ｍｍ 管接続部２の長さ １６０ｍｍ 可撓部３の内径 １５６ｍｍ 管接続部２の内径 １８４ｍｍ 可撓部３および管接続部２の外径 ２２０ｍｍ 可撓部の肉厚ｔ１ ２２ｍｍ 管接続部２の肉厚ｔ２ １８ｍｍ 溝３ａの幅 ４２．５ｍｍ ウレタンの分子量および結合基ＮＣＯを調整することに
より３種のヤング率のウレタン製可撓継手を注型成形に
より製作し実験を行なった結果、図２に示すように、Ｊ
ＩＳ Ｋ７２０３によるヤング率が２，７４０ｋｇ／ｃ
ｍ2 である実施例の継手は荷重を増加するにつれて弾性
変形し、約１８００ｋｇの荷重で可撓角２０°に達し、
荷重を取去った後は原状に弾性復帰することが判った。
また比較例１として示すヤング率７１９０ｋｇ／ｃｍ2
の継手は可撓角１２°附近で破壊し、必要な可撓角２０
°を得ることができなかった。また比較例２として示す
ヤング率８８０ｋｇ／ｃｍ2 の継手は荷重７００ｋｇ程
度で可撓角が２０°を超えてしまい、大きな荷重がかか
った場合剪断変形を生じるおそれがあり好ましくない。Total length 445 mm Length of flexible part 3 125 mm Length of pipe connection part 160 160 mm Inner diameter of flexible part 3 156 mm Inner diameter of pipe connection part 184 mm Outer diameter of flexible part 3 and pipe connection part 220 mm flexible Thickness of the part t1 22mm thickness of the pipe connection part 2 t2 18mm width of the groove 3a 42.5mm By adjusting the molecular weight of the urethane and the bonding group NCO, a urethane flexible joint of three kinds of Young's modulus is cast-formed. As a result of fabrication and experiment, as shown in FIG.
Young's modulus according to IS K7203 is 2,740 kg / c
The example joint with m 2 elastically deforms with increasing load, reaches a flexible angle of 20 ° at a load of about 1800 kg,
It was found that after removing the load, it returned to its original elasticity.
The Young's modulus shown as Comparative Example 1 was 7190 kg / cm 2.
Joint breaks at a flexible angle of about 12 °, and the required flexible angle of 20 °
° could not be obtained. In addition, the joint having a Young's modulus of 880 kg / cm 2 shown as Comparative Example 2 has a flexible angle exceeding 20 ° at a load of about 700 kg, and a large load may cause shear deformation, which is not preferable.
【００１６】なお、上記実施例および比較例の継手はい
ずれもＪＩＳ Ｋ ７１１３による伸びが１００％以上
のものであった。The joints of the above Examples and Comparative Examples all had an elongation of 100% or more according to JIS K 7113.
【００１７】[0017]
【発明の効果】以上述べたように、本発明によれば、ヤ
ング率が１，０００ｋｇ／ｃｍ2 〜５，０００ｋｇ／ｃ
ｍ2 の範囲内にあり、かつ伸びが１００％以上である硬
質プラスチックまたは硬質ゴムにより継手の主要部を形
成することにより、初期沈下変形において剪断変形せず
（従ってケーブルを損傷させない）、さらに最大２０°
の許容可撓角が得られた上に、可撓角２０°において継
手可撓部はなお弾性変形を行い荷重を取去った後原状に
復帰する。したがって、大きな地震で地盤が大きく振動
した場合でも地震が終って地盤が原状に復帰すれば継手
は原状に戻り継手としての機能を継続して発揮すること
ができる。As described above, according to the present invention, the Young's modulus is from 1,000 kg / cm 2 to 5,000 kg / c.
By forming the main part of the joint with a hard plastic or hard rubber that is in the range of m 2 and has an elongation of 100% or more, it does not shear (and thus does not damage the cable) in the initial squat deformation, and furthermore, 20 °
In addition to the above-mentioned allowable flexible angle, at the flexible angle of 20 °, the joint flexible portion is still elastically deformed and returns to its original shape after removing the load. Therefore, even if the ground vibrates significantly due to a large earthquake, if the earthquake ends and the ground returns to its original state, the joint returns to its original state and can continue to function as a joint.
【図１】本発明の実施例の一部、縦断正面図である。FIG. 1 is a longitudinal sectional front view of a part of an embodiment of the present invention.
【図２】同実施例における荷重と可撓角の関係について
の実験結果を比較例についての実験結果とともに示すグ
ラフである。FIG. 2 is a graph showing an experimental result on a relationship between a load and a flexible angle in the example, together with an experimental result on a comparative example.
１ 可撓継手 ２ 管接続部 ３ 可撓部 DESCRIPTION OF SYMBOLS 1 Flexible joint 2 Pipe connection part 3 Flexible part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 片岡 伸介 愛知県江南市藤ヶ丘３−１−８ 江南団 地48−505 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shinsuke Kataoka 3-1-8 Fujigaoka, Konan-shi, Aichi 48-505 Konan housing complex
Claims (1)
撓部を有する可撓継手であって、ＪＩＳ Ｋ ７２０３
の曲げ試験によるヤング率が１，０００ｋｇ／ｃｍ２〜
５，０００ｋｇ／ｃｍ２の範囲内にありかつＪＩＳ Ｋ
７１１３の引張試験による伸びがおよそ１００％以上
である硬質ウレタンによりその主要部を形成することに
より、２０゜以上の許容可撓角を有しかつ可撓角２０゜
において可撓部は弾性変形を行い、さらに可撓部の溝に
おける肉厚ｔ１が管接続部の肉厚ｔ２に対し０．８倍〜
１．３倍の範囲内の値であることを特徴とする可撓継
手。1. A flexible joint having a pipe connecting portion at both ends of a cylindrical body and a flexible portion at a central portion, the joint being JIS K7203.
Young's modulus by bending test of 1,000 kg / cm 2 ~
Within 5,000 kg / cm 2 and JIS K
To elongation due to tensile test 7113 forms the main part of a hard urethane is about 100% or more
Has an allowable flexible angle of 20 ° or more and a flexible angle of 20 °.
, The flexible portion undergoes elastic deformation, and the thickness t1 of the groove of the flexible portion is 0.8 times or more the thickness t2 of the pipe connection portion.
A flexible joint, wherein the value is within a range of 1.3 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4283672A JP2620177B2 (en) | 1992-09-29 | 1992-09-29 | Flexible joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4283672A JP2620177B2 (en) | 1992-09-29 | 1992-09-29 | Flexible joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06109174A JPH06109174A (en) | 1994-04-19 |
| JP2620177B2 true JP2620177B2 (en) | 1997-06-11 |
Family
ID=17668574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4283672A Expired - Fee Related JP2620177B2 (en) | 1992-09-29 | 1992-09-29 | Flexible joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2620177B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9752711B2 (en) | 2008-05-27 | 2017-09-05 | Springseal, Inc. | Pipe coupling assembly |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04277394A (en) * | 1991-03-05 | 1992-10-02 | Sekisui Chem Co Ltd | Flexible joint |
-
1992
- 1992-09-29 JP JP4283672A patent/JP2620177B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04277394A (en) * | 1991-03-05 | 1992-10-02 | Sekisui Chem Co Ltd | Flexible joint |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9752711B2 (en) | 2008-05-27 | 2017-09-05 | Springseal, Inc. | Pipe coupling assembly |
| USD865918S1 (en) | 2008-05-27 | 2019-11-05 | Springseal, Inc. | Coupling assembly |
| USD980954S1 (en) | 2008-05-27 | 2023-03-14 | Springseal, Inc. | Coupling assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06109174A (en) | 1994-04-19 |
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