JPH0428713Y2 - - Google Patents
Info
- Publication number
- JPH0428713Y2 JPH0428713Y2 JP1986173132U JP17313286U JPH0428713Y2 JP H0428713 Y2 JPH0428713 Y2 JP H0428713Y2 JP 1986173132 U JP1986173132 U JP 1986173132U JP 17313286 U JP17313286 U JP 17313286U JP H0428713 Y2 JPH0428713 Y2 JP H0428713Y2
- Authority
- JP
- Japan
- Prior art keywords
- backing metal
- pipe
- sided
- butt
- backing
- 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
Links
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は、管の突合せ片面溶接継手の改良に関
する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a butt single-sided welded joint for pipes.
［従来技術とその課題］
従来、例えば、水圧鉄管を据え付ける際の突合
せ溶接は、管の内外から完全な溶接が行われてき
た。しかし、両面からの溶接を行うためには、管
の外側とトンネルの間に作業者が入れるだけの空
間が必要であり、そのため、管の外径に比べて大
径のトンネルを掘削することは、コンクリート充
填も含めて多くの時間と費用がかかる。そこで、
このような問題点を軽減するため、最小限の大き
さのトンネルを掘削し、管の内面から溶接するこ
とが行われている。[Prior art and problems] Conventionally, for example, butt welding when installing a penstock has been performed completely from both inside and outside the pipe. However, in order to perform welding from both sides, a space large enough for a worker to enter is required between the outside of the pipe and the tunnel, and therefore excavating a tunnel with a diameter larger than the outside diameter of the pipe takes a lot of time and money, including filling it with concrete. Therefore,
To alleviate these problems, a minimum tunnel size is excavated and the pipe is welded from the inside.
管の内面から片面溶接する方法として、管の外
径と略同径の永久裏当金を一方の管端外面にとり
つけて溶接する方法がある。即ち、第７図に示す
ような形状の片面溶接継手で、片面から溶接を行
う手段である。この方法によれば、ルートギヤツ
プ、目違いなどの開先不整の許容量が大きくなる
という利点がある。 As a method for welding one side from the inner surface of a tube, there is a method in which a permanent backing metal having approximately the same diameter as the outer diameter of the tube is attached to the outer surface of one tube end and then welded. That is, it is a means for performing welding from one side of a single-sided welded joint having a shape as shown in FIG. This method has the advantage of increasing the tolerance for bevel irregularities such as root gaps and misalignments.
しかし、一方の管端１のみに裏当金２を付設し
た場合には、これに他方の管３を挿入すること
は、管の製作精度を考慮すると非常に困難であ
る。そのため、第８図のように、両方の管端外側
にそれぞれ半円状の裏当金２ａ，２ｂを対称的に
とりつけ、両者を突合せて行うようにしている。 However, when the backing metal 2 is attached to only one tube end 1, it is very difficult to insert the other tube 3 into it, considering the manufacturing precision of the tube. Therefore, as shown in FIG. 8, semicircular backing metals 2a and 2b are attached symmetrically to the outside of both tube ends, respectively, and the two are butted against each other.
しかしこの方法では、裏当金同志の突合せ部の
間隙から溶接金属の抜け落ちが生じ易く、また、
間隙が生じないように整形するには、管外面から
の作業が必要となる。また、管が傾斜している場
合には、裏当金と管の密着度が悪いと、この間隙
に溶接金属が流入し、欠陥が生じ易くなるという
課題がある。 However, with this method, weld metal tends to fall out from the gap between the butt parts of the backing metals, and
In order to shape the tube so that there are no gaps, work must be done from the outside of the tube. Further, in the case where the pipe is inclined, there is a problem that if the adhesion between the backing metal and the pipe is poor, weld metal flows into the gap and defects are likely to occur.
本考案の目的は、裏当金が開先組立てを容易に
するためのガイド用治具の役割をし、欠陥のない
健全な溶接部が得られる管の突合せ面継手を提供
せんとするものである。 The purpose of the present invention is to provide a butt joint for pipes in which the backing metal serves as a guide jig to facilitate groove assembly, and a sound welded part without defects can be obtained. be.
［考案の構成］
従来技術の問題点を解決する本考案の構成は、
端部外面、または、内面全周に、管の突合せ溶接
開先を充分にカバーしうる突出長をもつリング構
造の裏当金を付設した管と、裏当金をもたない管
との突合せ片面溶接継手において、上記裏当金を
もたない管の内面、または、外面に対応する裏当
金の面を、外側方に至るに従い拡開するテーパー
面とするとともに、この裏当金のテーパー面の基
部に、この裏当金を付設した管の開先に連なる段
差部を設けるとともに、この段差部と管の開先端
部とをシール溶接せしめ、更に、上記裏当金の内
径、又は、外径を、裏当金をもたない管の外径、
または、内径より径大、または、径小に形成した
ものである。[Structure of the invention] The structure of the invention that solves the problems of the prior art is as follows:
Butt of a pipe with a ring-structure backing metal attached to the outer or inner circumference of the end with a protruding length sufficient to cover the butt weld groove of the pipe, and a pipe without a backing metal. In a single-sided welded joint, the surface of the backing metal corresponding to the inner surface or the outer surface of the pipe without the backing metal is a tapered surface that widens toward the outside, and the taper of this backing metal is At the base of the surface, a stepped portion connected to the bevel of the pipe to which the backing metal is attached is provided, and this stepped portion and the beveled end of the tube are seal-welded, and further, the inner diameter of the backing metal, or The outer diameter is the outer diameter of the pipe without backing metal,
Alternatively, the diameter is larger or smaller than the inner diameter.
［実施例］ 図面について実施例の詳細を説明する。[Example] The details of the embodiments will be explained with reference to the drawings.
第１図は本考案片面溶接継手の要部を示す断面
図、第２図は裏当金に段差部のない場合の要部の
断面図、第３図は裏当金に段差部を設けた場合の
要部の断面図、第４図、第５図は、段差部の有無
による開先組立て時のルートギヤツプの大きさの
違いを示す説明図、第６図は水圧鉄管の例を示す
分解斜視図である。 Figure 1 is a cross-sectional view showing the main part of the single-sided welded joint of the present invention, Figure 2 is a cross-sectional view of the main part when the backing metal does not have a step, and Figure 3 shows the backing metal with a step. Figures 4 and 5 are explanatory diagrams showing the difference in the size of the root gap during groove assembly depending on the presence or absence of a step, and Figure 6 is an exploded perspective view showing an example of a penstock. It is a diagram.
一方の管１１の端部外面全周に、他方の管１２
との突合せ溶接開先１３を充分にカバーしうる突
出長をもつリング構造の裏当金１４を付設する。
この裏当金１４は、管１１に対して開先１３の先
端部間においてシール溶接１５し、一方、裏当金
１４の他端部の２個所を溶接することにより管１
１に付設される。上記シール溶接１５を全周にわ
たつて行うことにより、裏当金１４と管１１との
密着性がよくなり、溶接金属の流入を防ぐことが
できるようにしたものである。 Around the entire outer surface of the end of one tube 11, the other tube 12
A ring-structured backing metal 14 having a protruding length that can sufficiently cover the butt weld groove 13 is attached.
This backing metal 14 is seal-welded 15 to the pipe 11 between the tips of the grooves 13, and on the other hand, the other end of the backing metal 14 is welded at two places.
attached to 1. By performing the seal welding 15 over the entire circumference, the adhesion between the backing metal 14 and the pipe 11 is improved, and the inflow of weld metal can be prevented.
そして、上記裏当金１４の内面、即ち、裏当金
をもたない管１２の外面に対応する面を、外側方
に至るに従い拡開するテーパー面１４ａとすると
ともに、この裏当金１４のテーパー面１４ａの基
部に、この裏当金１４を付設した管１１の開先１
３に連なる段差部１６を設け、更に、上記裏当金
１４の内径を、裏当金１４をもたない他方の管１
２の外径より径大に形成したものである。 The inner surface of the backing metal 14, that is, the surface corresponding to the outer surface of the tube 12 without the backing metal, is made into a tapered surface 14a that widens toward the outside. The groove 1 of the pipe 11 with this backing metal 14 attached to the base of the tapered surface 14a
3, and furthermore, the inner diameter of the backing metal 14 is set to the other pipe 1 which does not have the backing metal 14.
It is formed to have a larger diameter than the outer diameter of No. 2.
尚、上述した実施例は、裏当金１４を管１１の
外側端部に設け、管の内部より突合せ片面溶接を
行うようにし、特に、水圧鉄管の溶接に適した例
を示したが、裏当金１４を管１１の内側端部に付
設し、管の外部より突合せ片面溶接を行うように
することも可能であるので、上記実施例に特定さ
れるものではない。 In the above-mentioned embodiment, the backing metal 14 is provided at the outer end of the pipe 11, and one-sided butt welding is performed from the inside of the pipe, which is particularly suitable for welding penstock pipes. It is also possible to attach the dowel 14 to the inner end of the tube 11 and perform one-sided butt welding from the outside of the tube, so the present invention is not limited to the above embodiment.
裏当金１４に設けた段差部１６による段差ｄと
テーパー面１４ａについては、これによつて管の
組立て誤差の許容量が大きくなるという利点があ
り、特に段差ｄについては、第２図の段差の無い
場合と、第３図の段差ｄを有する場合とを比較す
ると、同じ大きさのルートギヤツプＲに対して、
段差ｄを有する場合には、段差のない場合に比べ
て大きな目違い許容量（l1＜l2）が得られる。従
つて、管の組立て誤差により、２つの管端部の周
長が異なり目違いが生じた場合、第４図、第５図
から明らかなように、段差ｄがあることによつて
ルートギヤツプを小さく（R1＜R2）とることが
できる。しかし、段差ｄをあまり大きくすると、
溶接施工が困難になるので、水圧鉄管に適用する
場合には、周長の誤差の統計から段差ｄを３mm程
度とすることが望ましい。 Regarding the step d formed by the step portion 16 provided on the backing metal 14 and the tapered surface 14a, this has the advantage of increasing the allowable amount of tube assembly error. Comparing the case without the gap and the case with the step d in Fig. 3, for the same root gap R,
When there is a step d, a larger misalignment tolerance (l 1 <l 2 ) can be obtained than when there is no step. Therefore, if the circumferential length of the two pipe ends differs due to a pipe assembly error and a misalignment occurs, the root gap can be reduced by the step d, as is clear from Figures 4 and 5. (R 1 <R 2 ). However, if the step d is made too large,
Since welding becomes difficult, when applied to a penstock, it is desirable to set the step d to about 3 mm based on the statistics of circumferential length errors.
また、本考案の片面溶接継手は、水圧鉄管の内
面からの片面溶接に適用できるが、この場合裏当
金は下流側の管にとりつけ、第３図のように、も
う一方の管を上流側からこれに挿入して溶接を行
う。また、外面からの片面溶接についても、裏当
金を内面にとりつけることによつて、同様な片面
溶接継手とすることができる。 In addition, the single-sided welded joint of the present invention can be applied to single-sided welding from the inner surface of a penstock pipe, but in this case, the backing metal is attached to the downstream pipe, and the other pipe is connected to the upstream side as shown in Figure 3. Insert it into this and weld. Furthermore, for single-sided welding from the outside, a similar single-sided welded joint can be obtained by attaching a backing metal to the inside.
［考案の効果］
上述のように本考案の構成によれば、次のよう
な効果が得られる。[Effects of the Invention] As described above, according to the configuration of the present invention, the following effects can be obtained.
(a) 裏当金をもたない管に対応する裏当金の面
を、外側方に至るに従い拡開するテーパー面を
形成するとともに、このテーパー面の基部に開
先に連なる段差部を設けたことにより、開先の
組立て誤差の許容量が大きくなり、開先の組立
て容易性が確保できる。(a) The surface of the backing metal that corresponds to the pipe that does not have a backing metal is formed with a tapered surface that widens toward the outside, and at the base of this tapered surface, a stepped portion that connects to the groove is provided. This increases the tolerance for groove assembly errors and ensures ease of groove assembly.
(b) 段差部の形状による段差ｄを設けたので、同
じ大きさのルートギヤツプに対して、段差ｄを
もたないものに比べて、より大きな目違い許容
量が得られ、組立ての容易性が確保しうるばか
りでなく、管端部の周長が異なり目違いが生じ
た場合、段差ｄのない場合に比べてルートギヤ
ツプを小さくとることができる。(b) Since the step d is provided depending on the shape of the step, a larger misalignment tolerance can be obtained for the same size root gap compared to one without the step d, making assembly easier. Not only can this be ensured, but even if the circumferential lengths of the tube ends are different and misalignment occurs, the root gap can be made smaller than in the case where there is no step d.
(c) 裏当金の段差部と開先端部とをシール溶接し
たので、裏当金と管との密着性がよくなり、溶
接金属の流入を防ぎ、溶接欠陥の発生を防止す
ることができる。(c) Since the stepped part of the backing metal and the open end are seal-welded, the adhesion between the backing metal and the pipe is improved, preventing the inflow of weld metal and the occurrence of welding defects. .
(d) 管の内面、または、外面からの片面溶接に適
用でき、汎用性が大きい。(d) Can be applied to single-sided welding from the inner or outer surface of a pipe, making it highly versatile.
第１図は本考案片面溶接継手の要部を示す断面
図、第２図は裏当金に段差部のない場合の要部の
断面図、第３図は裏当金に段差部を設けた場合の
要部の断面図、第４図、第５図は、段差部の有無
による開先組立て時のルートギヤツプの大きさの
違いを示す説明図、第６図は水圧鉄管の例を示す
分解斜視図、第７図は従来の片面溶接継手の断面
図、第８図は同上斜視図である。
１１……管、１２……管、１３……溶接開先、
１４……裏当金、１４ａ……テーパー面、１５…
…シール溶接、１６……段差部、ｄ……段差、
l1，l2……目違い許容量、Ｒ，R1，R2……ルート
ギヤツプ。
Figure 1 is a cross-sectional view showing the main part of the single-sided welded joint of the present invention, Figure 2 is a cross-sectional view of the main part when the backing metal does not have a step, and Figure 3 shows the backing metal with a step. Figures 4 and 5 are explanatory diagrams showing the difference in the size of the root gap during groove assembly depending on the presence or absence of a step, and Figure 6 is an exploded perspective view showing an example of a penstock. FIG. 7 is a sectional view of a conventional single-sided welded joint, and FIG. 8 is a perspective view of the same. 11...Pipe, 12...Pipe, 13...Welding groove,
14...Backing money, 14a...Tapered surface, 15...
...Seal welding, 16...Step part, d...Step,
l 1 , l 2 ... Misalignment tolerance, R, R 1 , R 2 ... Root gap.
Claims (1)
接開先を充分にカバーしうる突出長をもつリング
構造の裏当金を付設した管と、裏当金をもたない
管との突合せ片面溶接継手において、 上記裏当金をもたない管の内面、または、外面
に対応する裏当金の面を、外側方に至るに従い拡
開するテーパー面とするとともに、この裏当金の
テーパー面の基部に、この裏当金を付設した管の
開先に連なる段差部を設けるとともに、この段差
部と管の開先端部とをシール溶接せしめ、 更に、上記裏当金の内径、または、外径を、裏
当金をもたない管の外径、または、内径より径
大、または、径小に形成したことを特徴とする管
の突合せ片面溶接継手。[Claims for Utility Model Registration] A pipe with a ring-structured backing metal attached to the outer surface of the end or the entire inner circumference with a protruding length sufficient to cover the butt weld groove of the pipe, and the backing metal. In a single-sided butt welded joint with a pipe that does not have a backing metal, the surface of the backing metal that corresponds to the inner or outer surface of the pipe that does not have a backing metal shall be a tapered surface that widens toward the outside. At the same time, at the base of the tapered surface of this backing metal, a step part is provided that connects to the bevel of the pipe to which this backing metal is attached, and this step part and the beveled end of the pipe are seal-welded, and further, the above-mentioned A butt single-sided welded joint for pipes, characterized in that the inner diameter or outer diameter of the backing metal is larger or smaller than the outer diameter or inner diameter of the pipe without the backing metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986173132U JPH0428713Y2 (en) | 1986-11-10 | 1986-11-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986173132U JPH0428713Y2 (en) | 1986-11-10 | 1986-11-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6380091U JPS6380091U (en) | 1988-05-26 |
| JPH0428713Y2 true JPH0428713Y2 (en) | 1992-07-13 |
Family
ID=31110306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986173132U Expired JPH0428713Y2 (en) | 1986-11-10 | 1986-11-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0428713Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190000301U (en) | 2017-07-25 | 2019-02-07 | 전석기 | Coffin having grip |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6350914B2 (en) * | 2014-09-02 | 2018-07-04 | スズキ株式会社 | Torsion beam suspension |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5754956Y2 (en) * | 1977-07-01 | 1982-11-27 |
-
1986
- 1986-11-10 JP JP1986173132U patent/JPH0428713Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190000301U (en) | 2017-07-25 | 2019-02-07 | 전석기 | Coffin having grip |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6380091U (en) | 1988-05-26 |
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