JP3845211B2 - Low temperature underground tank structure - Google Patents
Low temperature underground tank structure Download PDFInfo
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- JP3845211B2 JP3845211B2 JP30262698A JP30262698A JP3845211B2 JP 3845211 B2 JP3845211 B2 JP 3845211B2 JP 30262698 A JP30262698 A JP 30262698A JP 30262698 A JP30262698 A JP 30262698A JP 3845211 B2 JP3845211 B2 JP 3845211B2
- Authority
- JP
- Japan
- Prior art keywords
- side wall
- bottom plate
- temperature
- underground tank
- low
- 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
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、低温地下タンクの構造に関するものである。
【０００２】
【従来の技術】
従来の低温地下タンクにおいて、耐水圧強度版形式のものは、底版の強度によって地下水圧に抵抗できるように設計してある。
その場合に、図３に示すように、タンクの側壁ａと底版ｂとの接合部には目地ｃを設けて分離した構造を採用している。
【０００３】
【本発明が解決しようとする課題】
目地を設ければ、目地が存在しない構造を構築する場合と比較してそれだけ施工の手数と材料を必要とする。そのために側壁と底版との接合部に目地を設けて分離せず、直接に剛結合するタイプも考えられるが、次のような問題がある。
＜イ＞タンクの側壁下端部には、低温の内容液の冷熱による温度応力、あるいは液圧、ガス圧などの外力によって円周方向軸引っ張り力が生じている。また、セメントの水和反応による水和熱によって、温度応力も生じている。
そのために、剛結合のタンクでは、側壁下端部に貫通クラックが生じたり、水密性が損なわれる可能性がある。
＜ロ＞水密性を確保するために、側壁下端部の外周に鉄板などを設置することも考えられるが、その場合には従来タイプの比べてコストが上昇するため利点が見いだせない。
＜ハ＞剛結合タイプの場合、土圧、水圧などの外力によって側壁下端部に応力が集中する。したがって多量の鉄筋を配筋する必要があるが、狭い空間での配筋作業は困難である。
そのために、側壁の厚さを大きくする必要が生じ、掘削量、材料が増加し、コストアップの原因となる。
【０００４】
本発明は上記したような従来の問題を解決するためになされたもので、材料費、工事費を増加することなく、クラックの発生を抑制することができる、低温地下タンクの構造を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記のような目的を達成するために、本発明の低温地下タンクの構造は、側壁と底版と、側壁外周に設置した地下連壁とによって構成した低温地下タンクにおいて、側壁の下端と底版との間に目地を設けずに結合し、底版の外周の下縁部を、底版に影響する熱応力を緩和できる範囲で切り欠いて構成した、低温地下タンクを特徴としたものである。
【０００６】
【本発明の実施の態様】
以下図面を参照しながら本発明の低温地下タンクの構造の実施例について説明する。
【０００７】
＜イ＞タンクの構築。
低温地下タンクは、まず円筒状に地下連壁１を構築し、その内部を最深部まで掘削し、底版２のコンクリートを打設する。その後に側壁３のコンクリートを打設しつつ最上部までの構築を行い、屋根４を架設して完了する。
【０００８】
＜ロ＞底版２と側壁３の結合部。
本発明の地下タンクにおいては、前記したように側壁３の下端と底版２との間には目地を設けることなく、剛結合の構造を採用する。
【０００９】
＜ハ＞底版２外周の切り欠き。
一般に底版２は厚さの厚い円盤状であるが、本発明の底版２においては特に底版２の外周の下縁部を切り欠いて構成する。外周の下縁部を切り欠くことによって、底版２の外周の下縁部には切り欠き斜面５が形成される。
この切り欠き斜面５には不織布などを取り付けて縁切りを図るとともに、この部分に確実に水圧を作用させる。
【００１０】
＜ニ＞切り欠き範囲の設定。
この底版２の外周の下縁部を切り欠いた切り欠き斜面５の範囲は、底版２に影響する熱応力を緩和できる範囲に設定する。
熱応力を緩和できる範囲とは、例えば側壁３と底版２の結合部の温度分布によって決定する。例えば側壁３、底版２、地下連壁１、周囲の地盤を含めて図 に示すような温度分布である場合に、所定の温度線を想定してその温度よりも高い温度を生じる可能性のある部分を、底版２から切り欠いて排除する。その結果、切り欠き斜面５が形成される。
この切り欠きによって、底版外周部と側壁下端部との平均温度の差を小さくし、温度収縮量の違いによる側壁下端部の円周方向軸引っ張り力を低減することができる。
【００１１】
＜ホ＞ＰＣケーブル。
側壁３の少なくとも下部には円周方向に、円周方向ＰＣケーブル６を複数段に配置する。この円周方向ＰＣケーブル６を緊張してプレストレスを導入する。
さらに場合によっては、鉛直方向に、鉛直方向ＰＣケーブル７を配置し、鉛直方向にプレストレスを導入する。
【００１２】
【本発明の効果】
本発明の低温地下タンクの構造は以上説明したようになるから、次のような効果を達成できる。
＜イ＞低温タンクでは内容液の冷熱によって温度応力が発生する。しかし本発明の低温タンクではこのような熱応力を緩和できる範囲を設定し、それ以上の温度応力を生じる範囲を切り欠いてある。
また、この切り欠き斜面に水圧を作用させることによって、その半径方向成分により側壁下端部に円周方向軸圧縮力が生じ、前記の低温の内容液による温度応力や液圧、ガス圧などの外力、およびセメントの水和反応による水和熱による温度応力により発生する円周方向軸引張力を低減することができる。
したがって底版２と側壁３の連結部分に貫通クラックを発生するといった可能性が低く、水密性を損なうことがない。
＜ロ＞温度応力を抑制するための構造が簡単であるから、特に鉄筋の量が増加することもなく、配筋作業に影響を与えるといった問題は発生しない。
＜ハ＞また切り欠き斜面５に応じた形状で掘削を行なえば、掘削量が減少することはあっても、従来のように床版や側壁３の厚さが増加して掘削量が増加するといった問題も生じない。
＜ニ＞側壁３と底版２との接合部に目地を介在させない、剛結合の構造である。したがって目地の形成のための材料や慎重な作業を要せず、経済的な構築を行なうことができる。
＜ホ＞側壁３の少なくとも下部には円周方向に円周方向ＰＣケーブル６を複数段に配置して緊張してある。そのために円周方向軸引張力や、水和熱による温度応力による貫通クラックの発生を阻止でき、水密性を確保することができる。
さらに必要に応じて側壁下端部に鉛直ＰＣケーブルを配置してプレストレスを導入すれば、鉛直方向の鉄筋の過密な配置を避けることができる。
【図面の簡単な説明】
【図１】本発明の低温地下タンクの構造の実施例の説明図。
【図２】温度分布の説明図。
【図３】側壁の下部にＰＣケーブルを配置した状態の説明図。
【図４】従来の低温地下タンクの構造の実施例の説明図。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the structure of a low temperature underground tank.
[0002]
[Prior art]
In conventional low-temperature underground tanks, the water pressure-resistant strength plate type is designed so that it can resist the groundwater pressure by the strength of the bottom plate.
In this case, as shown in FIG. 3, a structure in which a joint c is provided and separated at a joint portion between the side wall a and the bottom plate b of the tank is adopted.
[0003]
[Problems to be solved by the present invention]
If joints are provided, it requires more work and materials than construction of a structure without joints. For this reason, a type in which the joint between the side wall and the bottom plate is not separated by providing a joint, but is directly rigidly connected, is considered, but there are the following problems.
<B> A circumferential axial pulling force is generated at the lower end of the side wall of the tank due to temperature stress due to the cold heat of the low-temperature content liquid, or external force such as liquid pressure or gas pressure. In addition, temperature stress is also generated by heat of hydration due to cement hydration reaction.
Therefore, in the rigidly connected tank, there is a possibility that a through crack is generated at the lower end portion of the side wall or watertightness is impaired.
<B> In order to ensure watertightness, it may be possible to install an iron plate or the like on the outer periphery of the lower end of the side wall. However, in that case, the cost increases compared to the conventional type, and no advantage can be found.
<C> In the case of the rigid coupling type, stress concentrates on the lower end of the side wall due to external forces such as earth pressure and water pressure. Therefore, it is necessary to arrange a large amount of reinforcing bars, but it is difficult to arrange the bars in a narrow space.
Therefore, it is necessary to increase the thickness of the side wall, and the amount of excavation and the material increase, resulting in an increase in cost.
[0004]
The present invention has been made to solve the conventional problems as described above, and provides a structure of a low-temperature underground tank capable of suppressing the occurrence of cracks without increasing material costs and construction costs. With the goal.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the structure of the low-temperature underground tank of the present invention is a low-temperature underground tank composed of a side wall, a bottom plate, and an underground continuous wall installed on the outer periphery of the side wall. It is characterized by a low-temperature underground tank that is joined with no joints in between, and the lower edge of the outer periphery of the bottom plate is cut out in a range that can alleviate the thermal stress that affects the bottom plate .
[0006]
[Embodiments of the present invention]
Embodiments of the structure of the low-temperature underground tank of the present invention will be described below with reference to the drawings.
[0007]
<I> Construction of tank.
The low-temperature underground tank first constructs an underground continuous wall 1 in a cylindrical shape, excavates the inside to the deepest part, and places concrete for the bottom slab 2. After that, the concrete up to the top is constructed while placing concrete on the side wall 3, and the roof 4 is installed and completed.
[0008]
<B> A connecting portion between the bottom plate 2 and the side wall 3.
In the underground tank of the present invention, as described above, a rigid connection structure is adopted without providing a joint between the lower end of the side wall 3 and the bottom plate 2.
[0009]
<C> Notches on the outer periphery of the bottom plate 2.
In general, the bottom plate 2 has a disk shape with a large thickness. However, the bottom plate 2 of the present invention is particularly configured by cutting out the lower edge portion of the outer periphery of the bottom plate 2. By cutting out the lower edge of the outer periphery, a
A non-woven fabric or the like is attached to the
[0010]
<D> Setting of notch range.
The range of the
The range in which the thermal stress can be relaxed is determined by, for example, the temperature distribution of the joint portion between the side wall 3 and the bottom plate 2. For example, when the temperature distribution is as shown in the figure including the side wall 3, bottom slab 2, underground connecting wall 1, and surrounding ground, there is a possibility that a temperature higher than that temperature may be generated assuming a predetermined temperature line. A portion is cut out from the bottom plate 2 and removed. As a result, a
By this notch, the difference in average temperature between the outer peripheral portion of the bottom plate and the lower end portion of the side wall can be reduced, and the circumferential axial pulling force at the lower end portion of the side wall due to the difference in temperature shrinkage can be reduced.
[0011]
<E> PC cable.
A circumferential PC cable 6 is arranged in a plurality of stages in the circumferential direction at least at the lower part of the side wall 3. Prestress is introduced by tensioning the circumferential PC cable 6.
Further, in some cases, the vertical PC cable 7 is arranged in the vertical direction, and prestress is introduced in the vertical direction.
[0012]
[Effect of the present invention]
Since the structure of the low temperature underground tank of the present invention is as described above, the following effects can be achieved.
<A> In the low temperature tank, temperature stress is generated by the cold heat of the content liquid. However, in the low temperature tank of the present invention, a range in which such thermal stress can be alleviated is set, and a range in which more temperature stress is generated is cut out.
In addition, by applying water pressure to the notched slope, a radial axial component generates a circumferential axial compressive force at the lower end of the side wall, and external forces such as temperature stress, liquid pressure, gas pressure, etc. due to the low temperature content liquid. , And the circumferential axial tensile force generated by temperature stress due to heat of hydration due to the hydration reaction of cement can be reduced.
Therefore, there is a low possibility that a through crack is generated at the connecting portion between the bottom plate 2 and the side wall 3, and the watertightness is not impaired.
<B> Since the structure for suppressing the temperature stress is simple, the amount of reinforcing bars is not particularly increased, and the problem of affecting the bar arrangement work does not occur.
<C> Further, if excavation is performed in a shape corresponding to the cut-out
<D> A rigid connection structure in which no joint is interposed at the joint between the side wall 3 and the bottom plate 2. Therefore, an economical construction can be performed without requiring materials for forming joints and careful work.
<E> At least at the lower part of the side wall 3, circumferential PC cables 6 are arranged in a plurality of stages in the circumferential direction and are strained. Therefore, it is possible to prevent the occurrence of through cracks due to the circumferential axial tensile force and the temperature stress due to the heat of hydration, and to ensure the water tightness.
Furthermore, if a prestress is introduced by arranging a vertical PC cable at the lower end of the side wall as necessary, it is possible to avoid overly dense arrangement of reinforcing bars in the vertical direction.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of a structure of a low-temperature underground tank according to the present invention.
FIG. 2 is an explanatory diagram of a temperature distribution.
FIG. 3 is an explanatory diagram showing a state in which a PC cable is arranged at the lower part of the side wall.
FIG. 4 is an explanatory view of an embodiment of a structure of a conventional low-temperature underground tank.
Claims (3)
側壁の下端と底版との間に目地を設けずに結合し、
底版の外周の下縁部を、底版に影響する熱応力を緩和できる範囲で切り欠いて構成した、
低温地下タンクの構造。In a low-temperature underground tank composed of a side wall, a bottom plate, and an underground connecting wall installed on the outer periphery of the side wall,
Join without providing a joint between the lower end of the side wall and the bottom plate,
The lower edge of the outer periphery of the bottom plate was cut out to the extent that thermal stress affecting the bottom plate could be relaxed .
Low temperature underground tank structure.
請求項１又は２記載の低温地下タンクの構造。The circumferential direction PC cable is arranged in a plurality of stages in the circumferential direction at least at the lower part of the side wall, and the circumferential direction PC cable is configured to be tensioned.
The structure of the low-temperature underground tank according to claim 1 or 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30262698A JP3845211B2 (en) | 1998-10-23 | 1998-10-23 | Low temperature underground tank structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30262698A JP3845211B2 (en) | 1998-10-23 | 1998-10-23 | Low temperature underground tank structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000130698A JP2000130698A (en) | 2000-05-12 |
| JP3845211B2 true JP3845211B2 (en) | 2006-11-15 |
Family
ID=17911255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30262698A Expired - Fee Related JP3845211B2 (en) | 1998-10-23 | 1998-10-23 | Low temperature underground tank structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3845211B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002188164A (en) * | 2000-12-22 | 2002-07-05 | Taisei Corp | Construction method for underground tank |
| JP5168960B2 (en) * | 2007-03-16 | 2013-03-27 | 株式会社大林組 | Underground cryogenic liquefied gas storage tank |
| JP5429537B2 (en) * | 2009-07-29 | 2014-02-26 | 清水建設株式会社 | Bottom plate structure of underground tank for cryogenic liquid storage |
| JP5877997B2 (en) * | 2011-10-26 | 2016-03-08 | 鹿島建設株式会社 | Method for underground storage of low-temperature liquefied gas and construction method of storage facility |
| JP5888727B2 (en) * | 2011-12-08 | 2016-03-22 | 鹿島建設株式会社 | Low temperature liquefied gas underground freezing controlled storage facility |
-
1998
- 1998-10-23 JP JP30262698A patent/JP3845211B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000130698A (en) | 2000-05-12 |
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