JPS6213466B2 - - Google Patents
Info
- Publication number
- JPS6213466B2 JPS6213466B2 JP52091435A JP9143577A JPS6213466B2 JP S6213466 B2 JPS6213466 B2 JP S6213466B2 JP 52091435 A JP52091435 A JP 52091435A JP 9143577 A JP9143577 A JP 9143577A JP S6213466 B2 JPS6213466 B2 JP S6213466B2
- Authority
- JP
- Japan
- Prior art keywords
- plate
- bottom plate
- backing
- welding
- annular
- 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
- 238000003466 welding Methods 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Description
【発明の詳細な説明】
本発明は、原油等を貯蔵する鋼板製の円筒形タ
ンクにおけるアニユラープレート（底板の外周に
位置し、側板が接合される板）と底板との溶接方
法、とくに溶接歪ないし溶接欠陥の発生しない溶
接方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for welding an annular plate (a plate located on the outer periphery of the bottom plate and to which side plates are joined) and a bottom plate in a cylindrical steel tank for storing crude oil, etc. The present invention relates to a welding method that does not cause distortion or welding defects.
周知の通り、原油等を貯蔵する鋼板製の円筒形
タンクは、まず基礎上に底板の外周に相当するア
ニユラープレートを敷設したのち、その上に、側
板最下段を組立て、真円度を確認した上で、次に
前記アニユラープレートで囲まれた内側の底板を
敷設するとともに、前記側板最下段上に順次上段
の側板を積み上げて溶接を施し、全体を組立てて
いくのが一般である。 As is well known, for cylindrical tanks made of steel plates that store crude oil, etc., first an annular plate corresponding to the outer circumference of the bottom plate is laid on the foundation, then the lowest side plate is assembled on top of it, and the roundness is checked. After that, the inner bottom plate surrounded by the annular plate is then laid down, and the upper side plates are stacked one after another on top of the lowermost side plate and welded to assemble the whole.
ところで、前記アニユラープレートおよび底板
は、幾枚かに分割された板材を溶接して一枚の円
形をなす底板にするものである。 By the way, the above-mentioned annular plate and bottom plate are made by welding plate materials divided into several pieces to form a single circular bottom plate.
そして、その分割された板材を溶接するにあた
つては、まずアニユラープレート部分を溶接し、
内側の底板部分は、その底板のほぼ中央部に位置
するものから順次、飛石法ないし後退法などによ
り、溶接し、前記アニユラープレートと底板と
は、最後に溶接するのが普通である。 When welding the divided plates, first weld the annual plate part,
The inner bottom plate portions are welded sequentially starting from the one located approximately in the center of the bottom plate by a stepping stone method or a retreating method, and the annular plate and the bottom plate are usually welded last.
すなわち、側板を接合するアニユラープレート
部分と底板部分とのそれぞれ個別に進められてい
た溶接施工に伴つて発生した歪や寸法的なズレ
を、最終的な接合作業となる前記アニユラープレ
ートと底板との溶接時に調整して接合し、その結
果一体的に形成された底板及びアニユラープレー
トの各部分において歪や凹凸がなく、全体として
も平らな底板部を得るためである。 In other words, the distortions and dimensional deviations that occurred due to the welding of the annular plate part and the bottom plate part, which were carried out separately to join the side plates, can be corrected when the annular plate part and the bottom plate part, which are the final joining work, are removed. This is to adjust and join the bottom plate and the annular plate during welding, and as a result, there is no distortion or unevenness in each part of the integrally formed bottom plate and annular plate, and the bottom plate part is flat as a whole.
ところで、従来、前記底板部分および底板部分
とアニユラープレート部分との溶接継手は、その
溶接施工の経済性と施工性から重ね継手によるも
のが通例である。 By the way, conventionally, the welded joints between the bottom plate part and the bottom plate part and the annular plate part are usually lap joints in view of the economy and workability of welding.
しかし、近年、石油タンク事故等の発生をみる
におよんで、アニユラープレートと底板相互の溶
接継手は、裏当板付の突き合わせ継手によること
を原則とするよう法的に規制されることとなつ
た。 However, in recent years, due to the occurrence of oil tank accidents, etc., the welded joint between the annular plate and the bottom plate has become legally regulated, requiring that a butt joint with a backing plate be used in principle. .
すなわち、第１図で示す通り、アニユラープレ
ート１と底板２および底板２を構成する一の底板
材２ａと当該一の底板材２ａに隣接する他の底板
材２ｂは、それぞれ裏当板３，３′を用いた突き
合わせ継手による溶接とすることが必要となつ
た。 That is, as shown in FIG. 1, the annular plate 1, the bottom plate 2, one bottom plate material 2a constituting the bottom plate 2, and the other bottom plate material 2b adjacent to the one bottom plate material 2a are connected to the backing plate 3, respectively. It became necessary to weld with a butt joint using 3'.
ところが、この第１図で理解されるように、一
の底板材２ａと他の底板材２ｂの裏当板３′の端
縁４とアニユラープレート１と底板２との突き合
わせ継手に用いられる裏当板３の側縁５との間に
は、隙間６がある。 However, as can be understood from this FIG. There is a gap 6 between the backing plate 3 and the side edge 5.
その結果、その上で隣接する一の底板材２ａ
と、隣接する他の底板材２ｂとを突き合わせ溶接
すれば、その溶接線７の下面に、前記隙間６が位
置し、ちようど、その溶接線７の下面一部に、そ
の隙間６による一種のノツチ部が形成されること
になり、該部が溶接欠陥（割れ）の発生原因とな
る。 As a result, one bottom plate material 2a adjacent thereto
and another adjacent bottom plate material 2b are butt welded, the gap 6 is located on the lower surface of the weld line 7, and a type of gap 6 due to the gap 6 is located on a part of the lower surface of the weld line 7. This results in the formation of a notch, which causes welding defects (cracks).
すなわち、一種のノツチ効果による割れ発生の
原因個所となる。 In other words, this becomes a point where cracks occur due to a kind of notch effect.
そこで、このような欠陥の発生を防止するため
にはもとより隙間６はないような構造とすること
が望ましい。しかし、この隙間６は底板接合時に
おける溶接熱の付加による部材の伸長を吸収する
ための緩衝間隙として働く。すなわち裏当板３′
を隣接する一の底板材２ａと隣接する他の底板材
２ｂとの裏に当てて、上面から底板同志を溶接す
ると溶接熱によつて裏当板３′が接合した底板と
共に伸長する。この伸長の長さを吸収するのが隙
間６の役割である。 Therefore, in order to prevent the occurrence of such defects, it is desirable to have a structure in which there is no gap 6. However, this gap 6 functions as a buffer gap for absorbing the elongation of the member due to the addition of welding heat when joining the bottom plate. That is, backing plate 3'
is applied to the back side of one adjacent bottom plate material 2a and another adjacent bottom plate material 2b, and when the bottom plates are welded together from the upper surface, the backing plate 3' expands together with the joined bottom plates due to welding heat. The role of the gap 6 is to absorb this length of extension.
一方溶接前にこの隙間６が発生しないように裏
当板３′を配設すると、溶接熱によつて伸長した
場合には裏当板の長手方向に逃げ場がないため、
底板に大きな溶接歪が発生してしまい、外観上及
び接合強度上大きな問題を生じる。 On the other hand, if the backing plate 3' is arranged so that this gap 6 does not occur before welding, there will be no escape in the longitudinal direction of the backing plate when it expands due to welding heat.
A large welding distortion occurs in the bottom plate, which causes major problems in terms of appearance and joint strength.
そこで本発明は、このような欠陥が発生する心
配のない裏当板付の突き合わせ継手による溶接方
法を開発したものである。 Therefore, the present invention has developed a welding method using a butt joint with a backing plate that is free from the risk of such defects occurring.
その方法の特徴とするところは、まず底板同志
を裏当板付の突き合わせ片面溶接により接合した
のち、次にアニユラープレートと底板との裏当板
の側縁と前記底板同志の裏当板の端縁との隙間上
面で、かつアニユラープレート１と底板２，２の
下面にあらかじめ前記裏当板よりも厚さの薄い差
し板を挿入して挾んだのち、アニユラープレート
と底板とを突き合わせ片面溶接するようにしたも
のである。 The feature of this method is that the bottom plates are first joined together by butt welding on one side with a backing plate, and then the side edges of the backing plates of the annular plate and the bottom plate are joined, and the edges of the backing plates of the bottom plates are then joined together. After inserting and sandwiching a insert plate thinner than the backing plate in advance above the gap between the edge and the bottom surface of the annular plate 1 and the bottom plates 2, 2, the annular plate and the bottom plate are butted together. It is designed to be welded on one side.
さらに、これを実施例図に基づいて、具体的に
説明すると、第２図で示す通り底板２を構成する
一の底板材２ａと当該底板材２ａに隣接する他の
底板材２ｂの突き合わせ継手における裏当板３′
の端縁４とアニユラープレート１と底板２との突
き合わせ継手の裏当板３の側縁５との間に形成さ
れている隙間６の上に、前記裏当板３，３′の厚
さより薄い差し板８を置き、しかるのち、アニユ
ラープレート１と底板２との突き合わせ片面溶接
を行うものである。 Furthermore, to specifically explain this based on the example drawings, as shown in FIG. Backing plate 3'
On the gap 6 formed between the edge 4 of the annular plate 1 and the side edge 5 of the backing plate 3 of the butt joint between the annular plate 1 and the bottom plate 2, A thin insert plate 8 is placed, and then the annular plate 1 and the bottom plate 2 are butt welded on one side.
以上のように、本発明方法は、一の底板材２ａ
と他の底板材２ｂの継手における裏当板３′の端
縁４とアニユラープレート１と底板２との継手に
おける裏当板３の側縁５との形成する隙間上面
に、薄い差し板８を置いてアニユラープレート１
と底板２との継手溶接を行うものであるため、隙
間６によるノツチ状溶接シームの形成は認められ
ず、したがつて、該部よりの割れの心配はない。 As described above, in the method of the present invention, one bottom plate material 2a
A thin insert plate 8 is placed on the upper surface of the gap formed between the edge 4 of the backing plate 3' at the joint between the annular plate 1 and the bottom plate 2, and the side edge 5 of the backing plate 3 at the joint between the annular plate 1 and the bottom plate 2. Place the annular plate 1
Since the joint welding is performed between the bottom plate 2 and the bottom plate 2, the formation of a notch-shaped weld seam due to the gap 6 is not observed, and therefore there is no fear of cracking from this part.
またアニユラープレート１と底板２および一の
底板材２ａと他の底板材２ｂの継目に用いられた
裏当板３，３′同志は、隙間６により分離された
ままであるため、前記溶接にともなう歪の発生も
抑制される。 Furthermore, since the backing plates 3 and 3' used at the joint between the annular plate 1 and the bottom plate 2, and one bottom plate material 2a and another bottom plate material 2b, remain separated by the gap 6, the welding The generation of distortion is also suppressed.
以上のように、本発明方法により、アニユラー
プレート１と底板２との溶接を行えば、アニユラ
ープレートを含めた底板全体の組立て溶接におけ
る溶接欠陥の発生は、抑止され鋼板製円筒形タン
クの底板として、安全な溶接構造のものとなる。 As described above, if the annular plate 1 and the bottom plate 2 are welded by the method of the present invention, the occurrence of welding defects during assembly and welding of the entire bottom plate including the annular plate can be suppressed. The bottom plate has a safe welded structure.
第１図は、従来一般的に採用された裏当板付の
片面溶接継手によるアニユラープレートと底板と
の継手部の一部破断斜面図。第２図は、本発明方
法による継手部の一部破断斜面図。第３図は、第
２図のＡ−Ａ横断側面図である。
１……アニユラープレート、２……底板、３…
…裏当板、４……端縁、５……側縁、６……隙
間、７……溶接線、８……差し板、２ａ……一の
底板材、２ｂ……他の底板材。
FIG. 1 is a partially cutaway perspective view of a joint between an annular plate and a bottom plate using a conventional single-sided welded joint with a backing plate. FIG. 2 is a partially cutaway oblique view of a joint portion obtained by the method of the present invention. FIG. 3 is a cross-sectional side view taken along line AA in FIG. 2. 1... Annular plate, 2... Bottom plate, 3...
...Backing plate, 4... Edge, 5... Side edge, 6... Gap, 7... Welding line, 8... Insert plate, 2a... One bottom plate material, 2b... Other bottom plate material.
Claims (1)
底板との裏当板付片面突合せ溶接において、アニ
ユラープレート１と底板２との裏当板３の側縁５
と、底板２を構成する一の底板材２ａと当該一の
底板材２ａと隣接する他の底板材２ｂの裏当板
３′の端縁４との隙間６上面であつてアニユラー
プレート１と一の底板材２ａおよび他の底板材２
ｂの下面にあらかじめ裏当板３および裏当板３′
より厚さの薄い差し板８を挿入して挾んだのち、
一の底板２ａと他の底板２ｂを裏当板付突合せ片
面溶接で接合し、その後にアニユラープレート１
と一の底板材２ａおよび他の底板材２ｂを裏当材
付突合せ片面溶接してアニユラープレート１と底
板２を接合することを特徴とする鋼板製タンクに
おけるアニユラープレートと底板との溶接方法。1 In single-sided butt welding with a backing plate between the annular plate and the bottom plate in a steel plate tank, the side edge 5 of the backing plate 3 between the annular plate 1 and the bottom plate 2
and the upper surface of the gap 6 between one bottom plate material 2a constituting the bottom plate 2 and the edge 4 of the backing plate 3' of the other bottom plate material 2b adjacent to said one bottom plate material 2a. One bottom plate material 2a and another bottom plate material 2
Backing plate 3 and backing plate 3' are attached to the bottom surface of b in advance.
After inserting and holding the thinner insert plate 8,
One bottom plate 2a and another bottom plate 2b are joined by butt welding on one side with a backing plate, and then the annual plate 1
A method of welding an annular plate and a bottom plate in a steel plate tank, characterized by joining annular plate 1 and bottom plate 2 by butt welding one bottom plate material 2a and another bottom plate material 2b with a backing material on one side. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9143577A JPS5426516A (en) | 1977-08-01 | 1977-08-01 | Method of welding annular plate and bottom board in steel plate tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9143577A JPS5426516A (en) | 1977-08-01 | 1977-08-01 | Method of welding annular plate and bottom board in steel plate tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5426516A JPS5426516A (en) | 1979-02-28 |
| JPS6213466B2 true JPS6213466B2 (en) | 1987-03-26 |
Family
ID=14026279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9143577A Granted JPS5426516A (en) | 1977-08-01 | 1977-08-01 | Method of welding annular plate and bottom board in steel plate tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5426516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63202265U (en) * | 1987-06-19 | 1988-12-27 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6121375A (en) * | 1984-06-29 | 1986-01-30 | 三井建設株式会社 | Roof structure of tank |
-
1977
- 1977-08-01 JP JP9143577A patent/JPS5426516A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63202265U (en) * | 1987-06-19 | 1988-12-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5426516A (en) | 1979-02-28 |
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