JPS62147190A - Tube body connecting structure - Google Patents
Tube body connecting structureInfo
- Publication number
- JPS62147190A JPS62147190A JP28558585A JP28558585A JPS62147190A JP S62147190 A JPS62147190 A JP S62147190A JP 28558585 A JP28558585 A JP 28558585A JP 28558585 A JP28558585 A JP 28558585A JP S62147190 A JPS62147190 A JP S62147190A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- pipe
- residual stress
- stress
- inner ring
- 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.)
- Pending
Links
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、管の接続構造に係わり、特に原子カプラント
、火力プラント、化学プラント等の腐食埴境下で用いら
れる管体の接続部に生じる残留応力を低減するのに好適
な管の接続構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a pipe connection structure, and in particular, the present invention relates to a connection structure for pipes, and in particular, the present invention relates to a connection structure for pipes, and in particular, the present invention relates to a pipe connection structure, and in particular, the present invention relates to a pipe connection structure, and in particular, the present invention relates to a pipe connection structure. The present invention relates to a pipe connection structure suitable for reducing stress.
従来の管のす／ドイツチ型接合憎造は、第１図に示すよ
うに接続される管１を相手方の管２とサポート用の内リ
ング３との間にさし込んで接合する構造である。The conventional pipe/German joint type joint structure has a structure in which a pipe 1 to be connected is inserted between a mating pipe 2 and an inner ring 3 for support to join, as shown in Fig. 1. .
この接合方法は特開昭６０−３３８３６号公報にて示さ
れており、第５図に示すように管１及び内リング３をマ
ンドレル４を押し込むことによってローラ５によジ拡管
し、管２に管ｌ及び内リング３を機械的に拡管接合する
ものである。This joining method is disclosed in Japanese Patent Application Laid-Open No. 60-33836, and as shown in FIG. The pipe 1 and the inner ring 3 are mechanically expanded and joined.
第６図は従来の構造において測定された接合部近傍の管
１の内面に発生している残留応力を示している。FIG. 6 shows the residual stress generated on the inner surface of the tube 1 near the joint, measured in the conventional structure.
＠６図より、軸方向残留応力及び晴方向残留応力げとも
に内リング先端部近傍Ａ部において高い値を示している
。From Figure @6, both the axial residual stress and the vertical residual stress show high values in the area A near the tip of the inner ring.
この高残留応力は、管１と管１の内（Ｉ！Ｉを流ねる内
部流体との腐食に起因する応力腐食割ハ或いは水素遅れ
割れ等の材料破壊を発生させる原因となる。This high residual stress causes material failure such as stress corrosion cracking or hydrogen delayed cracking due to corrosion between the pipe 1 and the internal fluid flowing through the pipe 1 (I!I).
従って、この残留応力を、応力腐食割れ或いは水素遅れ
割れの発生する限界応力以下にする必要がある。Therefore, it is necessary to make this residual stress below the critical stress at which stress corrosion cracking or hydrogen delayed cracking occurs.
この残留応力を低減させる方法として、接続作業完了後
に第６図の、１１１分を加熱し応力除去を行う方法があ
る。As a method for reducing this residual stress, there is a method of removing the stress by heating for 111 minutes as shown in FIG. 6 after the connection work is completed.
しかし１．この方法でげ接合部での結合力を保持するた
めに管２と内リング１の冷却をする必要があり、加熱及
び冷却機能を有する複雑で高価な装置となる。But 1. In this method, it is necessary to cool the tube 2 and the inner ring 1 in order to maintain the bond strength at the barb joint, resulting in a complicated and expensive device having heating and cooling functions.
又、応力除去焼鈍には多大な作業時間が必要となり経済
性が極めて悪い。Moreover, stress relief annealing requires a large amount of working time and is extremely uneconomical.
このため、作業工程を増加させないようにし。Therefore, avoid increasing the number of work steps.
かつ特別な装置を用いることなく、さらに接続部のシー
ル性能及び機械的強度を低下させることなく残留応力を
低減できる接合部構造の改善が必要であった。Furthermore, there was a need for an improved joint structure that could reduce residual stress without using special equipment and without reducing the sealing performance and mechanical strength of the joint.
本発明の目的は、腐食環境下で用いらねる管の接続部に
おいて、残留応力に起因する材料破壊を防止することが
可能な低残留応力型管体接続構造を提供することＶＣあ
る。An object of the present invention is to provide a low residual stress type tube connection structure capable of preventing material failure due to residual stress at a connection portion of a tube used in a corrosive environment.
本発明は、サンドイッチ型接合構造の内リング３先端部
近傍の管１の内面に発生する残留応力か、第６図に示す
如く、同リング３の拡管による管１を押し拡げる力Ｐ及
び外側のｖ２による弾性回復力Ｑによることに着目して
なされたものである。The present invention utilizes the residual stress generated on the inner surface of the tube 1 near the tip of the inner ring 3 of the sandwich-type joint structure, as shown in FIG. This was done by focusing on the elastic recovery force Q due to v2.
ここで、第６図において、内リング３の先端部よりｔ′
側にある管１は直接内部流体と接触しないため舗食ざね
ない。これによりｔ′惧］１の管１が応力腐食割れを起
こすことはない。またｔ側の管１の腐食により水素が若
干ｔ′（ＩｌｌＩＶＣ移動したとしても、ｔ′側は内リ
ング３により強固に結合ざねでいるためき裂が生じるこ
とけない。Here, in FIG. 6, from the tip of the inner ring 3, t'
Since the pipe 1 on the side does not come into direct contact with the internal fluid, there is a possibility that it will be crushed. As a result, stress corrosion cracking will not occur in the tube 1 at t'1. Further, even if hydrogen moves slightly t' (IllIVC) due to corrosion of the tube 1 on the t side, cracks will not occur on the t' side because the inner ring 3 is firmly connected.
また、内リング３の内面には（管２及び管１の弾性回復
力がカロわるため圧縮応力が生じており、内リング３の
内面で応力腐食割ｒ或いは水素遅れ割れ等の材料破壊が
生じること汀ない。In addition, compressive stress is generated on the inner surface of the inner ring 3 due to the loss of elastic recovery force of the tubes 2 and 1, and material failure such as stress corrosion cracking or hydrogen delayed cracking occurs on the inner surface of the inner ring 3. It doesn't stop.
以上のことより、サンドイッチ型接合構造において、腐
食に起因する材料破壊が生じる可能性かあるのは管ｌの
内部流体に接し−でいる部分であり、かつ残留応力が高
い内リング先端部近傍である。From the above, in the sandwich type joint structure, material failure due to corrosion is likely to occur in the parts of the pipe that are in contact with the internal fluid, and in the vicinity of the tip of the inner ring where residual stress is high. be.
この残留応力を低下させるためＶＣは、内リング３によ
る押し付は力Ｐと管２の弾性回復力Ｑを低職さゼること
か考えられるが、押し付は力Ｐば。In order to reduce this residual stress, it is conceivable that the pressing by the inner ring 3 will reduce the force P and the elastic recovery force Q of the tube 2, but the pressing is performed by the force P.
接合部の結合力に直接関係しているため、押し付は力Ｐ
の低下は結合力Ｐの低下をもたらすため好捷しくない。Since it is directly related to the bonding force of the joint, the pressing force is P
A decrease in the bonding force P is undesirable because it causes a decrease in the bonding force P.
このため、弾性回復力Ｑの低減を計るのが最善の方法で
あると考えられる。Therefore, it is considered that the best method is to reduce the elastic recovery force Q.
ここで、′１ｊｌｔ性回復力Ｑを低減させるにはｌ側に
位置する管２の剛性を低下さ一＋！：ね−は艮いわけで
あり、言い換λ−ねは体積を減少させれば良いわけであ
る。Here, in order to reduce the '1jlt recovery force Q, the rigidity of the pipe 2 located on the l side must be reduced. ：Ne- is meaningless, and in other words, λ-ne can be reduced in volume.
［かし７ながら、ここで問題となるのは、を側に位置し
、でいる管２の剛性がｔ′の接合部の結合力ｆ（大きく
寄与しているｔめ、を側の管２の１１ｍ１ｌ性の低下は
、接合部の結合力の低下ｔもｔら丁ことになる。[However, the problem here is that the joint force f at the joint where the stiffness of the tube 2 is t' (t is a large contributor), and the stiffness of the tube 2 on the side is A decrease in the 11ml property of the material also results in a decrease in the bonding strength of the joint.
そこで本発明では、を伸に位ＩＮする一＃？２の１削性
をあ１り低下さぜることなく、押し付は力Ｑを低下ざぜ
るために、ｔ ９１１１に位置する管２の内面の円周方
同内面に切欠きを設けることにより、管１と管２の接触
面イ責を削減させて押し付は力Ｑｆ低下ざぜて残留応力
を低減出来る接合ｖＷ造とした。Therefore, in the present invention, one #? In order to reduce the pressing force Q without compromising the machinability of the pipe 2, a notch is provided on the same circumferential surface of the inner surface of the pipe 2 located at t9111. The joint vW structure is used to reduce damage to the contact surface between 1 and the pipe 2, reduce the pressing force Qf, and reduce residual stress.
以下、本発明の実施例を第１図〜第３図によりｄ兄明す
る。Embodiments of the present invention will be explained below with reference to FIGS. 1 to 3.
第１図は、本発明によるサンドイッチ型接合構造の基本
構造を示すもので、管１．管２及び内り／グ３により構
成さｒており１管２の内面の円周方向に切欠き６を設け
た構造としている。本構造によねは内リング３先端部に
おいて、管２と管１とが接触する面積がきわめて少ない
ため、管１全押し付ける管２の弾性回復力はわずかにＱ
’ Ｌかない。これにより拡管作業時に管１は第１因中
の矢印Ｂ方向に自由に変形することができるため、管１
の内面に生じる軸方向残留応力及び周方向残留応力を第
１図中に示すように大＠に低減させることが出来る。FIG. 1 shows the basic structure of the sandwich-type joint structure according to the present invention. It is composed of a tube 2 and an inner tube 3, and has a structure in which a notch 6 is provided in the circumferential direction of the inner surface of the tube 2. The problem with this structure is that the contact area between tube 2 and tube 1 at the tip of inner ring 3 is extremely small, so the elastic recovery force of tube 2 that presses the entire tube 1 is slightly Q.
' L is not good. As a result, the pipe 1 can be freely deformed in the direction of arrow B in the first factor during pipe expansion work, so the pipe 1
As shown in FIG. 1, the axial residual stress and circumferential residual stress generated on the inner surface of the can be greatly reduced.
第２図げ、本発明の構造において、内＠流体の圧力Ｆが
加わった場合の管１内面に生じる軸方向応力分布及び開
方向応力分布を示しており、管２と管ｌとの接触部分に
おいて最大応力が発生−「る。Figure 2 shows the axial stress distribution and the opening direction stress distribution generated on the inner surface of the tube 1 when the internal pressure F of the fluid is applied in the structure of the present invention, and shows the contact area between the tube 2 and the tube I. The maximum stress occurs at
このように１本発明の構造によｊば、残留応力の最大値
の発生する場所と、内圧により生じる応刀の最大値の発
生する場所をずらすことができ、全体として、合計応力
を低下σぜることかできる。In this way, according to the structure of the present invention, it is possible to shift the location where the maximum value of residual stress occurs and the location where the maximum value of response caused by internal pressure occurs, and as a whole, the total stress is reduced. I can do it.
なお、一般に、内部流体の圧力によジ生じる応力ぼ、管
の材料の弾性１恨度以下に設計されるため、管】の変形
は０．２％以下と小ざく、管１の外面が′α２の切欠き
部分６で盛り上がることはなく、常に健全な形状を保っ
ている。Generally, the stress caused by the pressure of the internal fluid is designed so that the elasticity of the tube material is less than 1, so the deformation of the tube is as small as 0.2% or less, and the outer surface of the tube is The notch part 6 of α2 does not swell and always maintains a healthy shape.
第３図は本発明め他実施例である。FIG. 3 shows another embodiment of the present invention.
本講造は、管板６に管？ｆｆ内リング８により接続する
ものであり、管板の両側に切欠き１０を設けることによ
り、同リング先端部の管７の内面に生じる残留応力全１
丘減させることが出来る。Is this Kozo a tube on the tube plate 6? ff is connected by an inner ring 8, and by providing notches 10 on both sides of the tube plate, the total residual stress generated on the inner surface of the tube 7 at the tip of the ring 1 is reduced.
It is possible to reduce the hill.
第４図は、看板に管を接続する場合の他実癩例を示す。FIG. 4 shows another example of connecting a pipe to a signboard.
管板の場合は、管板の持つ全体の剛性が大きいため５第
４図に示すような切欠き１１を設けても。In the case of a tube sheet, since the tube sheet has high overall rigidity, a notch 11 as shown in FIG. 4 may be provided.
結合力に影＃を及ぼすことはない。そこでこのような形
状に切欠きを設けｔ場合でも、Ｄ部分の肉厚が薄く、剛
性が小さいため１弾性回復力が小さくなろｔめ、＃７を
押し付ｖｆる力が小さくなり、結果として、管７に生じ
る残留応力を小ざくすることが出来る。It does not affect the bond strength. Therefore, even if a notch is provided in such a shape, the wall thickness of the D part is thin and the rigidity is small, so the elastic recovery force will be small, and the force pressing #7 will be small, resulting in , the residual stress generated in the tube 7 can be reduced.
本発甲によれば、管のサンドイッチ型接続構造において
、接続部に設けた切欠きにより、管に生じる残留応力を
簡単にかつ確実に低減出来るので。According to the present invention, in the sandwich-type pipe connection structure, the residual stress generated in the pipe can be easily and reliably reduced by the notch provided in the connection part.
残留応力に起因する応力腐食割れ或いけ水素遅カ割ね等
の材料破壊を防止する効果がある。It has the effect of preventing material failure such as stress corrosion cracking or hydrogen slow cracking caused by residual stress.
用１図は本発明の一実施例で接合部構造の縦断面図及び
残留応力分布図、第２図は内ｌＥＫよる応力分布図、第
３図、第４図げ他の実施例で管仮に管を接続する構造の
縦断面図、第５図は従来のサンドイッチ型接合方法の縦
断面図、第６図は従来の接合構造の縦断面図及び残留応
力分布図である。
１・・・管、２・・・管、３・・・内リング、４・・・
マンドレルーーー′Fig. 1 is a longitudinal cross-sectional view and residual stress distribution diagram of a joint structure according to one embodiment of the present invention, Fig. 2 is a stress distribution diagram due to inner lEK, and Figs. FIG. 5 is a vertical cross-sectional view of a structure for connecting pipes, FIG. 5 is a vertical cross-sectional view of a conventional sandwich type joining method, and FIG. 6 is a vertical cross-sectional view and a residual stress distribution diagram of a conventional joint structure. 1...Pipe, 2...Pipe, 3...Inner ring, 4...
Mandrerou'
Claims (1)
るサンドイッチ型接合構造において、一番外側の管もし
くは管板に切欠きを設けたことを特徴とする管体接続構
造。1. A tube-body connection structure characterized in that a notch is provided in the outermost tube or tube sheet in a sandwich-type joint structure consisting of a tube, a tube, and an inner ring, or a tube, a tube plate, and an inner ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28558585A JPS62147190A (en) | 1985-12-20 | 1985-12-20 | Tube body connecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28558585A JPS62147190A (en) | 1985-12-20 | 1985-12-20 | Tube body connecting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62147190A true JPS62147190A (en) | 1987-07-01 |
Family
ID=17693460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28558585A Pending JPS62147190A (en) | 1985-12-20 | 1985-12-20 | Tube body connecting structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62147190A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6024234A (en) * | 1983-07-21 | 1985-02-06 | Power Reactor & Nuclear Fuel Dev Corp | Joint structure of pipe ends |
-
1985
- 1985-12-20 JP JP28558585A patent/JPS62147190A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6024234A (en) * | 1983-07-21 | 1985-02-06 | Power Reactor & Nuclear Fuel Dev Corp | Joint structure of pipe ends |
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