JPS5946867B2 - Reinforcement wall of side plate and side bottom joint of existing steel cylindrical storage tank - Google Patents
Reinforcement wall of side plate and side bottom joint of existing steel cylindrical storage tankInfo
- Publication number
- JPS5946867B2 JPS5946867B2 JP51150820A JP15082076A JPS5946867B2 JP S5946867 B2 JPS5946867 B2 JP S5946867B2 JP 51150820 A JP51150820 A JP 51150820A JP 15082076 A JP15082076 A JP 15082076A JP S5946867 B2 JPS5946867 B2 JP S5946867B2
- Authority
- JP
- Japan
- Prior art keywords
- storage tank
- plate
- side plate
- bottom joint
- wall
- 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
- 238000003860 storage Methods 0.000 title claims description 45
- 229910000831 Steel Inorganic materials 0.000 title claims description 7
- 239000010959 steel Substances 0.000 title claims description 7
- 230000002787 reinforcement Effects 0.000 title description 13
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 239000004567 concrete Substances 0.000 claims description 9
- 239000011513 prestressed concrete Substances 0.000 claims description 6
- 238000005304 joining Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
Description
【発明の詳細な説明】
この発明は、重油等の液体を貯蔵する大型の鋼製円筒形
貯槽、特に既設の貯槽における側板および側−底継手部
の補強壁に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large cylindrical steel storage tank for storing liquid such as heavy oil, and particularly to a reinforcing wall for a side plate and a side-to-bottom joint in an existing storage tank.
周知の通り、この鋼製円筒形貯槽は、一般に基礎盛砂上
に底板を円形に敷きつめ、その周辺部にアニユラープレ
ートを円環状に設け、そのプレート上に側壁を円筒状に
直立して組み上げた構造となつている。ところで、この
ような大型円筒形貯槽において、従来の建設設計法は、
中小型貯槽建設の技術経験をベースとして、タンク径に
対し、相似的に各種寸法が決められてきた感が強く、原
則として、標準設計仕様ＪＩＳ−Ｂ・８５０１やＡ−Ｐ
−Ｉ６５０に基づいて設計製作されているのが一般であ
る。As is well known, this steel cylindrical storage tank is generally constructed by laying a bottom plate in a circular shape on top of the foundation sand, installing an annular plate around the periphery, and building the side wall upright in a cylindrical shape on top of the plate. It has a structure. By the way, the conventional construction design method for such large cylindrical storage tanks is as follows:
Based on the technical experience of small and medium-sized storage tank construction, there is a strong feeling that various dimensions have been determined in a similar manner to the tank diameter, and as a general rule, standard design specifications JIS-B 8501 and A-P are used.
-It is generally designed and manufactured based on I650.
すなわち、構造材の板厚が貯蔵液による水頭圧力を受け
る薄肉内圧円筒の応力式を計算基準として設計している
ため、貯槽の大きさと内容物の重量に対して、板厚はそ
れほど厚いものではなく、全体としては極めて可撓性に
富んだ柔かい構造になつている。したがって、このＪＩ
ＳないしＡＰＩに基づいて設計された貯槽に、貯蔵液を
設計限度内の満タン状態に貯蔵させた場合、円筒側壁は
、膨出するため曲面状に変形し、その結果、側板とアニ
ユラープレートとの接合継手部には、前記曲げモーメン
トによる応力集中がみられる。In other words, the thickness of the structural material is designed using the stress formula of a thin-walled internal pressure cylinder that receives head pressure from the stored liquid as a calculation standard, so the thickness of the structural material is not that thick compared to the size of the storage tank and the weight of the contents. The overall structure is extremely flexible and soft. Therefore, this JI
When a storage tank designed based on S or API is filled with liquid within the design limit, the cylindrical side wall bulges and deforms into a curved shape, causing the side plate and annular plate to bulge. Stress concentration due to the bending moment can be seen at the joint between the two parts.
そして、特に、これは貯蔵液の出し入れにより、曲げ応
力の繰り返し作用がおこり、場合によつては、その繰り
返し曲げ応力の負荷で、該部からの亀裂・破壊といつた
事故原因にもなり、さらには最近問題となつている貯槽
基礎の不等沈下により本体の傾きが生じるような場合は
、前記アニユラープレート部付近に同様の高応力が発生
し、亀裂および破壊による貯油漏洩等の欠陥が生じる可
能性もある。In particular, this causes repeated bending stress due to the loading and unloading of the stored liquid, and in some cases, the loading of the repeated bending stress can cause accidents such as cracks and destruction from the part. Furthermore, if the main body tilts due to uneven settlement of the storage tank foundation, which has become a problem recently, a similar high stress will occur near the annular plate, causing defects such as storage oil leakage due to cracks and fractures. There is a possibility that this may occur.
したがつて、最近では、このような大型貯槽における構
造上のトラブルを未然に防止するため、特に今後新設す
る貯槽を設計製作する上で、材質・強度および構造全体
にわたり、社会的にも技術的にもその安全性に対する再
検討とそれに関する新しい技術の要請が高まつている。Therefore, in order to prevent structural troubles in such large storage tanks, in recent years, social and technical considerations have been taken into account, especially when designing and manufacturing new storage tanks that will be built in the future, in terms of materials, strength, and overall structure. However, there is a growing demand for a reconsideration of its safety and for new technologies related to it.
すなわち、以前のように、地理的にも気象的にも有利な
場所に貯槽建設が自由にできなくなつている現在では、
強度的信頼性の高い経済的な大型円筒形貯槽を設計・建
設するため、貯槽にかかるいろいろな外力、例えば、静
液圧、地震荷重、風荷重、不等沈下などの設計荷重を綿
密に想定して、貯槽の各部応力の理論的解析を行ない、
貯槽各部の真の強度を把握したり、あるいは側一底継手
部の溶接強度の検討や新しい接合法の開発など各メーカ
はもちろんのことユーザにおいても積極的に進めており
、さらに一層の貯槽の安全性と経済性をはかるようにな
つている。In other words, nowadays it is no longer possible to freely construct storage tanks in geographically and climatically advantageous locations as before.
In order to design and construct an economical large cylindrical storage tank with high strength and reliability, various external forces that will be applied to the storage tank, such as hydrostatic pressure, seismic load, wind load, uneven settlement, etc., are carefully assumed. Then, we conducted a theoretical analysis of the stress in each part of the storage tank.
Manufacturers as well as users are actively working to understand the true strength of each part of the storage tank, consider the welding strength of the side-bottom joint, and develop new joining methods. Safety and economy are now being considered.
しかしながら、今後新設する貯槽に関しては、前述の通
り、安全性と経済性を充分考慮した新しい構造設計を実
施すればよいが、これまですでに建設されている貯槽の
側板および側一底継手部の対策ないし補強に関しては、
いまのところあまり効果的といえる方法は知見されてい
ない。However, for new storage tanks to be built in the future, as mentioned above, a new structural design should be implemented that takes safety and economic efficiency into full consideration, but measures should be taken for the side plates and side bottom joints of storage tanks that have already been constructed. Regarding reinforcement,
At present, no method has been found to be very effective.
例えば、従来の既設貯槽に対する補強方法として、貯槽
の側板外周に線材、棒材、ないしはワイヤロープに熱を
加え、それを側板に密状に連続的に巻きつけ、貯槽の周
方向張力を、前記巻きつけた、綿材等に分担させる方法
や、円筒形貯槽を内外二重側壁を形成し、外側壁間に中
間介在物を設け、それにより内側壁内の内圧の一部を外
側壁に負担させる二重側壁に負担させる二重側壁の補強
構造などが知られているが、これらは規模が大がかりと
なり、多額の費用がかさむため、既設貯槽の補強用とし
ては、マイナスであつたり、あるいは応急処置的な補強
方法であるため、どの程度、側板等の補強効果をもつの
か予見できないなど、ほとんどが多くの問題を残してい
る補強方法である。For example, as a conventional method for reinforcing an existing storage tank, heat is applied to a wire, rod, or wire rope around the outer circumference of the side plate of the storage tank, and the wire rope is tightly and continuously wrapped around the side plate to reduce the tension in the circumferential direction of the storage tank. A method of sharing the pressure with wrapped cotton material, etc., or forming a cylindrical storage tank with double inner and outer walls, and providing an intermediate between the outer walls, thereby transferring part of the internal pressure in the inner wall to the outer wall. Reinforcement structures such as double side walls in which the burden is placed on the double side walls are known, but these are large-scale and involve a large amount of cost, so they are not suitable for reinforcing existing storage tanks, or are only suitable for temporary use. Most of these reinforcement methods have many problems, such as the fact that it is not possible to predict to what extent they will have a reinforcing effect on the side panels, etc., because they are procedural reinforcement methods.
したがつて、本発明は、前記問題を解決し、従来の補強
に比べて、強度的にすぐれ、半永久的な補強となり得る
補強壁を提示するものである。Therefore, the present invention solves the above-mentioned problems and provides a reinforced wall that has superior strength compared to conventional reinforcement and can serve as semi-permanent reinforcement.
ところで、その発明の要旨とするところは、アニユラー
プレートに側板を結合してなる既設の鋼製円筒形貯槽に
おいて、前記アニユラープレート余長部下の基礎全周に
基礎外装板として矢板を打込み、この矢板を打込んだ後
、前記アニユラープレート余長部下の貯装基礎を残すよ
うにして、貯槽の外周縁を堀削して、貯槽と同心円状に
、溝を配設し、しかるのち、側板および側・底継手部さ
らに前記基礎矢板回りをプレストレストコンクリートお
よび普通コンクリートで囲壁し、側板の膨出によるアニ
共ラープレートに生じる繰返し曲げモーメントを抑制し
、貯槽の亀裂・破壊を防ぐための保護補強壁としたもの
である。さらにこれを実施例に基づいて具体的に説明す
る。By the way, the gist of the invention is that, in an existing steel cylindrical storage tank formed by joining a side plate to an annular plate, a sheet pile is driven as a basic exterior plate around the entire circumference of the foundation below the extra length of the annular plate, After driving this sheet pile, the outer peripheral edge of the storage tank is excavated so as to leave the storage foundation under the extra length of the annual plate, and a groove is arranged concentrically with the storage tank, and then, The side plates, the side/bottom joints, and the base sheet piles are surrounded by prestressed concrete and ordinary concrete to suppress the repetitive bending moment that occurs to the general plate due to the bulge of the side plates, and to prevent cracks and destruction of the storage tank. This is a reinforced wall. Further, this will be specifically explained based on examples.
第１図は、本発明の補強構造を示すもので、１は鋼製円
筒形貯槽の側板、２はアニユラープレートであり、３は
アニユラーブトトの基礎プロツクである。FIG. 1 shows the reinforcing structure of the present invention, in which 1 is a side plate of a steel cylindrical storage tank, 2 is an annular plate, and 3 is a basic block of an annular tank.
４はアニユラープレート余長部５下の基礎全周に深さ２
〜３ｍ程度、打込んだ矢板である。4 is a depth of 2 around the entire foundation under the extra length part 5 of the annual plate.
This is a sheet pile that has been driven to a length of ~3m.
６，６′は、本発明の補強構造の要部であるコンクリー
ト囲壁であり、このコンクリート囲壁６，６′のうち、
側板１および側・底継手部７周辺を補強・固定するため
に、プレストレストをかけたコンクリート６を用い、そ
れより下方、すなわち、前記矢板４回りの固定壁として
は、普通コンクリート６′を用いて固めてある。6 and 6' are concrete surrounding walls which are the main parts of the reinforcing structure of the present invention, and among these concrete surrounding walls 6 and 6',
Prestressed concrete 6 is used to reinforce and fix the area around the side plate 1 and the side/bottom joint 7, and ordinary concrete 6' is used below it, that is, as a fixed wall around the sheet pile 4. It's solidified.
なお、この囲壁高さは、側板１にかかる応力分布状態お
よび側板膨出影響範囲を算定し、決定する。The height of the surrounding wall is determined by calculating the stress distribution state on the side plate 1 and the influence range of the side plate bulge.
さらに、本実施例のコンクリート囲壁形状は、上部補強
壁（主として側板の固定）、中間部補強壁（側一底継手
部周辺の固定）、下部補強壁（矢板回りの固定）との３
つの複合型囲壁で形成されており、すなわち、上部は、
円柱型、中間部は円すい台型、下部は円柱と円すい台型
の混合形にして、補強強度を計り、とくに中間部壁の一
部と下部壁は地下に埋設して、安定度の助長を計つてい
る。以上が、本発明である補強壁構造の概略であるが、
次にこの補強壁の製作過程を第２図、第３図、第４図に
よつて説明する。まず、アニユラープレート余長部５下
の基礎全周に深さ２〜３ｍ程度に矢板４を打込んで、雨
水および地下水の浸水を防ぎ、アニユラープレート余長
部５下の貯槽基礎を固定した後（第２図）、貯槽本体の
外周縁基礎を前記打込んだ矢板４長さより浅めに貯槽回
りを同心円状に溝８を堀削する。Furthermore, the concrete enclosing wall shape of this example has three reinforcement walls: an upper reinforcement wall (mainly fixing the side plates), a middle reinforcement wall (fixing around the side bottom joint), and a lower reinforcement wall (fixing around the sheet pile).
It is formed by two composite enclosure walls, namely the upper part is
The structure is cylindrical, the middle part is truncated conical, and the lower part is a mixture of cylindrical and truncated conical to increase reinforcement strength.In particular, part of the middle wall and the lower wall are buried underground to promote stability. I'm planning. The above is an outline of the reinforced wall structure of the present invention,
Next, the manufacturing process of this reinforcing wall will be explained with reference to FIGS. 2, 3, and 4. First, a sheet pile 4 is driven to a depth of about 2 to 3 meters around the entire circumference of the foundation under the extra length of the annual plate 5 to prevent rainwater and groundwater from flooding and fix the storage tank foundation under the extra length of the annual plate 5. After that (Fig. 2), a groove 8 is dug concentrically around the storage tank to be shallower than the length of the driven sheet pile 4 in the outer peripheral edge foundation of the storage tank body.
（第３図）堀溝後、貯槽側板部１、側底継手部７周辺お
よび矢板４回り全面をプレストレストおよび普通コンク
リートで、第４図の複合型囲壁構造にて、該各部と間隙
を作らないよう密着させて立設する。(Fig. 3) After trenching, the entire area around the storage tank side plate 1, side bottom joint 7, and around the 4 sheet piles is made of prestressed and ordinary concrete, and the composite enclosing wall structure shown in Fig. 4 is used to avoid creating gaps between these parts. Install them in close contact.
その後、第１図のように溝８と囲壁とが空隙を残さない
ように土砂等で埋め、半地下型の補強囲壁構造を形成す
る。なお、補強壁の側板よりの最頂端と側板１をシーリ
ング剤による防水シール９を塗設する。Thereafter, as shown in FIG. 1, the trench 8 and the surrounding wall are filled with earth and sand so that no gaps remain, forming a semi-underground reinforced surrounding wall structure. In addition, a waterproof seal 9 made of a sealant is applied to the top end of the reinforcing wall from the side plate and the side plate 1.
また、第５図で示すように、貯槽内部に石油等の内容物
が払出してある場合、すなわち溶接作業が可能な場合、
他の実施例としてコンクリート補強壁と貯槽側板部１と
の間に固定ボルトを植込み、それを溶着し、一体化する
。さらに、補強壁最頂部の全周には、前記防水シール９
の代替として、側板より張り出すようにして、雨除板１
１を展設し、安定強度を増長させている。In addition, as shown in Figure 5, when the contents such as oil are discharged inside the storage tank, that is, when welding work is possible,
As another embodiment, fixing bolts are implanted between the concrete reinforced wall and the storage tank side plate part 1, and they are welded and integrated. Furthermore, the waterproof seal 9 is provided around the entire circumference of the top of the reinforcing wall.
As an alternative to the rain protection board 1, which extends beyond the side board
1 is deployed to increase stable strength.
本発明は、以上説明したように、貯槽側板と側底継手部
周辺の補強壁をプレストレストコンクリートで固めた囲
壁としたため、このプレスドレス効果が、貯蔵液の出し
入れ変動等による側板の膨出を抑止し、側一底継手部周
辺、とくにアニユラープレートに生じる繰返しモーメン
トの発生を消失させることになる。As explained above, in the present invention, the reinforcing wall around the storage tank side plate and side bottom joint is made of prestressed concrete, so this press dress effect suppresses the expansion of the side plate due to changes in the intake and withdrawal of stored liquid, etc. This also eliminates the generation of repetitive moments that occur around the side-to-bottom joint, especially in the annular plate.
さらに、補強壁の一部を地下に埋設し、安定度を考慮さ
せた半地下囲壁構造としたため、補強強度は万全であり
、また防水シールあるいは雨除板を配設したことは、雨
水の浸入による側板の腐食、サビなどの貯槽本体に対す
る欠陥を防ぐことになり、耐久性も充分である。Furthermore, a part of the reinforced wall is buried underground to create a semi-underground enclosure structure that takes stability into account, ensuring perfect reinforcement strength, and the provision of waterproof seals or rain protection plates prevents rainwater from entering. This prevents defects to the storage tank body, such as corrosion of the side plates and rust, and has sufficient durability.
したがつて、本発明の補強壁は、プレストレストコンク
リートの使用により、既設貯槽の構造的安定度を高める
効果に加えて、貯槽と補強壁とが一体で、半地下型囲壁
であるため、半永久的な補強構造となり、経済性にも充
分メリツトを有するものである。Therefore, the reinforced wall of the present invention not only improves the structural stability of the existing storage tank by using prestressed concrete, but also has a semi-permanent structure because the storage tank and the reinforced wall are integrated and are semi-underground enclosure walls. This provides a reinforced structure with sufficient economical advantages.
第１図は実施例を示す一部断面図、第２、第３、第４図
は、実施例１の製作過程を説明する一部断面図、第５図
は、他の実施例を示す一部断面図である。
１・・・・・・側板、２・・・・・・アニユラープレー
ト、３・・・・・・基礎プロツク、４・・・・・・矢板
、５・・・・・・アニユラープレート余長部、６・・・
・・・プレストレストコンクリート、６ｔ・・・・・普
通コンクリート、７・・・・・・側一底継手部、８・・
・・・・溝、９・・・・・・防水シール、１０・・・・
・・固定ボルト、１１・・・・・・雨除板。FIG. 1 is a partial cross-sectional view showing an embodiment, FIGS. 2, 3, and 4 are partial cross-sectional views explaining the manufacturing process of Example 1, and FIG. 5 is a partial cross-sectional view showing another example. FIG. 1...Side plate, 2...Annual plate, 3...Basic block, 4...Sheet pile, 5...Annual plate extra Nagabe, 6...
...Prestressed concrete, 6t...Ordinary concrete, 7...Single bottom joint, 8...
...Groove, 9...Waterproof seal, 10...
・Fixing bolt, 11 ・・Rain shield plate.
Claims (1)
製円筒形貯槽において、前記アニユラープレート余長部
下の基礎全周に基礎外装板として矢板を打込み、この矢
板を打込んだ後、前記アニユラープレート余長部下の貯
槽基礎を残すようにして、貯槽の外周縁を堀削して、貯
槽と同心円状に溝を配設し、しかるのち、側板および側
−底継手部さらに前記基礎矢板回りを、プレストレスト
コンクリートおよび普通コンクリートで囲壁したことを
特徴とした既設の鋼製円筒形貯槽の側板および側底継手
部の補強壁。1. In an existing steel cylindrical storage tank formed by joining a side plate to an annular plate, a sheet pile is driven as a foundation exterior plate around the entire circumference of the foundation under the extra length of the annular plate, and after driving this sheet pile, the annular plate is The outer periphery of the storage tank is excavated to leave the storage tank foundation under the extra length of the Yuler plate, and a groove is placed concentrically with the storage tank, and then the side plates and the side-to-bottom joint, and around the foundation sheet pile are excavated. A reinforcing wall for the side plate and side bottom joint of an existing steel cylindrical storage tank, characterized by surrounding it with prestressed concrete and ordinary concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51150820A JPS5946867B2 (en) | 1976-12-17 | 1976-12-17 | Reinforcement wall of side plate and side bottom joint of existing steel cylindrical storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51150820A JPS5946867B2 (en) | 1976-12-17 | 1976-12-17 | Reinforcement wall of side plate and side bottom joint of existing steel cylindrical storage tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5375518A JPS5375518A (en) | 1978-07-05 |
| JPS5946867B2 true JPS5946867B2 (en) | 1984-11-15 |
Family
ID=15505114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51150820A Expired JPS5946867B2 (en) | 1976-12-17 | 1976-12-17 | Reinforcement wall of side plate and side bottom joint of existing steel cylindrical storage tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5946867B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6374475A (en) * | 1986-09-19 | 1988-04-04 | Kenji Okata | Preservation of cut food |
| JPH0179992U (en) * | 1987-11-16 | 1989-05-29 |
-
1976
- 1976-12-17 JP JP51150820A patent/JPS5946867B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6374475A (en) * | 1986-09-19 | 1988-04-04 | Kenji Okata | Preservation of cut food |
| JPH0179992U (en) * | 1987-11-16 | 1989-05-29 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5375518A (en) | 1978-07-05 |
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