JP2014008984A - Low-temperature liquid storage tank - Google Patents

Low-temperature liquid storage tank Download PDF

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JP2014008984A
JP2014008984A JP2012145611A JP2012145611A JP2014008984A JP 2014008984 A JP2014008984 A JP 2014008984A JP 2012145611 A JP2012145611 A JP 2012145611A JP 2012145611 A JP2012145611 A JP 2012145611A JP 2014008984 A JP2014008984 A JP 2014008984A
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bottom plate
storage tank
heater
liquid storage
end side
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Masaki Wakabayashi
雅樹 若林
Kenji Ito
健二 伊藤
Tomosaburo Fujinaga
友三郎 藤永
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a low-temperature liquid storage tank, reducing the number of PC steels arranged by inhibiting the generation of axial tensile force at the bottom plate.SOLUTION: A low-temperature liquid storage tank B includes: a bottom plate 2; a cylindrical dike 3 erected by rigidly connecting the lower end part 3a thereof to the base plate 2; and a storage tank 4 for storing a low-temperature liquid 1, which is disposed in the interior surrounded by the bottom plate 2 and the cylindrical dike 3. The bottom plate 2 is provided with a PC steel 8 disposed extending in the circumferential direction at the end side S2 to introduce pre-stress, and a bottom heater 10 buried for preventing the peripheral ground G from being freezed and expanded by the stored low-temperature liquid 1. The bottom heater 10 is provided extending from the central part side S1 of the bottom plate 2 to the end side S2 of the bottom plate 2.

Description

本発明は、例えば液化天然ガス等の低温液体の貯蔵に用いられる低温液体貯蔵用タンクに関する。   The present invention relates to a cryogenic liquid storage tank used for storing a cryogenic liquid such as liquefied natural gas.

従来、図２に示すように、液化天然ガス（ＬＮＧ）、液化石油ガス（ＬＰＧ）等の低温液体１を貯蔵するためのタンク（低温液体貯蔵用タンクＡ）には、底版２と、底版２に下端部３ａを繋げて立設される円筒状の防液堤３と、底版２と防液堤３で囲まれた内部に配設される金属製の貯槽（内槽）４とを備えて構成したものがある。また、この種の低温液体貯蔵用タンクＡは、一般に、上部に平板状あるいはドーム状の屋根５を設け、さらに貯槽４と底版２、防液堤３、屋根５との間に保冷材６を設けて構築される（例えば、特許文献１参照）。   Conventionally, as shown in FIG. 2, a tank (cold liquid storage tank A) for storing a low temperature liquid 1 such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) includes a bottom plate 2 and a bottom plate 2. A cylindrical breakwater 3 that is erected by connecting the lower end 3 a to the bottom, and a metal storage tank (inner tank) 4 that is disposed inside the bottom plate 2 and the breakwater 3. There is something configured. Further, this type of cryogenic liquid storage tank A is generally provided with a flat plate-like or dome-like roof 5 at the top, and a cold insulating material 6 is provided between the storage tank 4 and the bottom plate 2, the liquid barrier 3 and the roof 5. Provided and constructed (for example, see Patent Document 1).

また、防液堤３は、貯槽４から万一低温液体１が漏洩した場合にこの低温液体１の拡散を局所化（防止）するためのものであり、その下端部３ａを底版２に剛結して設けられている。さらに、防液堤３は、プレストレストコンクリート造で構築されることが多く、周方向に配置したＰＣ鋼材７によってプレストレスを導入することにより、漏液時に低温液体１を確実に保持できるようにしている。また、底版２にも、その端部２ａ側に周方向にＰＣ鋼材８を配置してプレストレスが導入され、漏液時に低温液体１を確実に保持できるようにしている。なお、図２には低温液体漏洩時の防液堤３の外力状態を示している。   The breakwater 3 is used to localize (prevent) the diffusion of the low temperature liquid 1 in the unlikely event that the low temperature liquid 1 leaks from the storage tank 4, and its lower end 3 a is rigidly connected to the bottom plate 2. Is provided. Furthermore, the breakwater 3 is often constructed of a prestressed concrete structure. By introducing prestress by the PC steel material 7 arranged in the circumferential direction, the cryogenic liquid 1 can be reliably held at the time of leakage. Yes. In addition, prestress is introduced to the bottom plate 2 by placing a PC steel material 8 in the circumferential direction on the end 2a side, so that the cryogenic liquid 1 can be reliably held at the time of leakage. FIG. 2 shows the external force state of the breakwater 3 when the low temperature liquid leaks.

さらに、貯蔵した低温液体１（例えば液化天然ガスでは−１６２℃）によって周辺地盤Ｇが凍結膨張することを防止するために、底版２には底部ヒータ９が埋設されている。（例えば、特許文献２参照）。また、底部ヒータ９としては、温水を用いたブラインヒータ、電気ヒータ等がある。   Further, a bottom heater 9 is embedded in the bottom plate 2 in order to prevent the surrounding ground G from being frozen and expanded by the stored low temperature liquid 1 (for example, -162 ° C. for liquefied natural gas). (For example, refer to Patent Document 2). Examples of the bottom heater 9 include a brine heater using hot water and an electric heater.

特開２００４−１９９２０号公報Japanese Patent Laid-Open No. 2004-19920 特開２００１−７３３９５号公報JP 2001-73395 A

ここで、底版２の端部２ａ側に、周方向に延在するＰＣ鋼材８が配置され、また、ブラインヒータの場合は配管径が大きいため、底版２に埋設される底部ヒータ９の配置範囲を防液堤３の内面３ｂまでの中央部側Ｓ１とし、底版２の端部側Ｓ２には底部ヒータ９が配設されていない。   Here, the PC steel material 8 extending in the circumferential direction is arranged on the end 2a side of the bottom slab 2, and in the case of a brine heater, since the pipe diameter is large, the arrangement range of the bottom heater 9 embedded in the bottom slab 2 Is the central side S1 up to the inner surface 3b of the breakwater 3, and the bottom heater 9 is not disposed on the end side S2 of the bottom plate 2.

一方、底版２の端部側Ｓ２は、外気温の影響を受けて、夏は膨張し、冬は収縮する。そして、夏の膨張時には、底版２の中央部側Ｓ１に軸引張力が発生し、冬の収縮時には、底版２の端部側Ｓ２に軸引張力が発生する。このため、上記従来の低温液体貯蔵用タンクＡにおいては、低温液体漏洩に対して必要なＰＣ鋼材７、８に加え、夏の膨張時や冬の収縮時に発生する軸引張力を打ち消すためのＰＣ鋼材８を配置する必要があった。   On the other hand, the end side S2 of the bottom plate 2 is affected by the outside air temperature and expands in summer and contracts in winter. An axial tensile force is generated on the center side S1 of the bottom slab 2 during expansion in summer, and an axial tensile force is generated on the end side S2 of the bottom slab 2 during contraction in winter. For this reason, in the conventional cryogenic liquid storage tank A, in addition to the PC steel materials 7 and 8 necessary for the cryogenic liquid leakage, the PC for canceling the axial tensile force generated during summer expansion or winter contraction. It was necessary to arrange the steel material 8.

本発明は、上記事情に鑑み、底版に軸引張力が発生することを抑止して、ＰＣ鋼材の配置数を削減することを可能にした低温液体貯蔵用タンクを提供することを目的とする。   In view of the above circumstances, an object of the present invention is to provide a cryogenic liquid storage tank that can reduce the number of PC steel materials by suppressing the generation of axial tensile force on the bottom plate.

上記の目的を達するために、この発明は以下の手段を提供している。   In order to achieve the above object, the present invention provides the following means.

本発明の低温液体貯蔵用タンクは、底版と、該底版に下端部を剛結して立設した筒状の防液堤と、前記底版と前記防液堤で囲まれた内部に配設され、低温液体を貯蔵するための貯槽とを備える低温液体貯蔵用タンクであって、前記底版には、端部側に周方向に延在してプレストレスを導入するＰＣ鋼材が配設されるとともに、貯蔵した前記低温液体によって周辺地盤が凍結膨張することを防止するための底部ヒータが埋設され、前記底部ヒータが前記底版の中央部側から前記底版の端部側まで延設されている、あるいは前記底部ヒータが前記底版の中央部側から前記防液堤の内面まで延設されるとともに、前記底版の端部側に別系統の底部ヒータが配設されていることを特徴とする。   The cryogenic liquid storage tank of the present invention is disposed in a bottom slab, a cylindrical liquid breakwater erected with a bottom end rigidly connected to the bottom slab, and an interior surrounded by the bottom slab and the liquid breakwater. A cryogenic liquid storage tank comprising a storage tank for storing a cryogenic liquid, wherein the bottom plate is provided with a PC steel material extending in the circumferential direction on the end side and introducing prestress. A bottom heater for preventing the surrounding ground from freezing and expanding by the stored low-temperature liquid is embedded, and the bottom heater extends from the center side of the bottom plate to the end side of the bottom plate, or The bottom heater extends from the center side of the bottom plate to the inner surface of the breakwater, and another bottom heater is disposed on the end side of the bottom plate.

また、本発明の低温液体貯蔵用タンクにおいては、前記底部ヒータがブレインヒータであることが望ましい。   In the cryogenic liquid storage tank of the present invention, it is desirable that the bottom heater is a brain heater.

本発明の低温液体貯蔵用タンクにおいては、従来、防液堤の内面までの範囲に配置されている底部ヒータを底版のＰＣ鋼材が配置されている端部側まで延ばしたことで、または底版の端部側に別系統の底部ヒータを配置したことで、底部ヒータによって底版の端部側の温度を制御することが可能になる。これにより、底版の端部側が夏に膨張、冬に収縮する量を小さくでき、これに伴って底版の中央部側や端部側に発生する軸引張力を低減できる。   In the low-temperature liquid storage tank of the present invention, conventionally, the bottom heater arranged in the range up to the inner surface of the breakwater is extended to the end side where the PC steel material of the bottom plate is arranged, or the bottom plate By arranging the bottom heater of another system on the end side, the temperature on the end side of the bottom plate can be controlled by the bottom heater. As a result, the amount that the end side of the bottom plate expands in the summer and contracts in the winter can be reduced, and the axial tensile force generated on the center side or the end side of the bottom plate can be reduced accordingly.

よって、本発明の低温液体貯蔵用タンクによれば、従来、底版の中央部側や端部側に発生する軸引張力を打ち消すために配置していたＰＣ鋼材を削減でき、底版の端部側に配置するＰＣ鋼材を削減することが可能になる。   Therefore, according to the cryogenic liquid storage tank of the present invention, it is possible to reduce the amount of PC steel that has conventionally been arranged to cancel the axial tensile force generated on the center side or end side of the bottom plate, and the end side of the bottom plate It becomes possible to reduce the PC steel materials to be disposed on the board.

逆に言えば、底版の端部側の温度を底部ヒータで制御するようにしたことで、底版の端部側に配置するＰＣ鋼材を削減することができ、この底版の端部側に配置するＰＣ鋼材を削減できることで、確実に底部ヒータを底版の端部側まで延ばし、または底版の端部側に別系統の底部ヒータを配置し、底版の端部側の温度を制御することが可能になる。   In other words, the temperature of the end side of the bottom plate is controlled by the bottom heater, so that the PC steel material arranged on the end side of the bottom plate can be reduced, and the temperature is arranged on the end side of the bottom plate. By reducing the amount of PC steel, it is possible to reliably extend the bottom heater to the end of the bottom slab, or arrange a separate bottom heater on the end of the bottom slab, and control the temperature on the end of the bottom slab Become.

また、本発明の低温液体貯蔵用タンクにおいて、底部ヒータがブラインヒータの場合には、温水の温度を適度に調節することで、温度が低いところは高く、高いところは低くでき、底版の温度を平均化できる。   Further, in the low-temperature liquid storage tank of the present invention, when the bottom heater is a brine heater, the temperature of the low temperature can be increased and the temperature of the bottom can be decreased by appropriately adjusting the temperature of the hot water. Can be averaged.

本発明の一実施形態に係る低温液体貯蔵用タンクを示す断面図である。It is sectional drawing which shows the cryogenic liquid storage tank which concerns on one Embodiment of this invention. 従来の低温液体貯蔵用タンクを示す断面図である。It is sectional drawing which shows the conventional tank for low-temperature liquid storage.

以下、図１（及び図２）を参照し、本発明の一実施形態に係る低温液体貯蔵用タンクについて説明する。本実施形態は、例えば液化天然ガス等の低温液体の貯蔵に使用されるタンクに関するものである。   Hereinafter, a cryogenic liquid storage tank according to an embodiment of the present invention will be described with reference to FIG. 1 (and FIG. 2). The present embodiment relates to a tank used for storing a low-temperature liquid such as liquefied natural gas.

本実施形態の低温液体貯蔵用タンクＢは、図１に示すように、従来の低温液体貯蔵用タンクＡと同様、平盤状の底版２と、円筒状の防液堤３と、低温液体１を貯蔵する金属製の貯槽４と、屋根５と、保冷材６とを備えて構築されている。また、防液堤３は、周方向に配置したＰＣ鋼材７と縦方向（鉛直方向）に配置したＰＣ鋼材（不図示）によって、周方向と縦方向にそれぞれプレストレスを導入して構築されている。   As shown in FIG. 1, the low-temperature liquid storage tank B of the present embodiment is a flat plate-shaped bottom plate 2, a cylindrical breakwater 3, and a low-temperature liquid 1, as in the conventional low-temperature liquid storage tank A. It is constructed with a metal storage tank 4, a roof 5, and a cold insulation material 6. In addition, the breakwater 3 is constructed by introducing pre-stress in the circumferential direction and the longitudinal direction by the PC steel material 7 arranged in the circumferential direction and the PC steel material (not shown) arranged in the longitudinal direction (vertical direction). Yes.

また、本実施形態の底版２は、貯槽４に貯蔵した低温液体１によって周辺地盤Ｇが凍結膨張することを防止するための底部ヒータ１０を埋設して構築されている。さらに、底版２の端部２ａ側（Ｓ２）に、漏液時に低温液体１を確実に保持するためのＰＣ鋼材８が周方向に沿って配設され、この周方向に延在するＰＣ鋼材８によって端部側Ｓ２にプレストレスが導入されている。   The bottom plate 2 of the present embodiment is constructed by embedding a bottom heater 10 for preventing the surrounding ground G from being frozen and expanded by the low temperature liquid 1 stored in the storage tank 4. Further, a PC steel material 8 is disposed along the circumferential direction on the end 2a side (S2) of the bottom plate 2 so as to reliably hold the low temperature liquid 1 at the time of leakage, and the PC steel material 8 extending in the circumferential direction. Thus, prestress is introduced into the end portion side S2.

一方、本実施形態の低温液体貯蔵用タンクＢでは、底部ヒータ１０が、貯槽４及び防液堤３の直下で、防液堤３の内面３ｂまでの中央部側Ｓ１だけでなく、この中央部側Ｓ１からＰＣ鋼材８が配設される底版２の端部側Ｓ２（防液堤３の内面３ｂよりも径方向外側の底版２の端部２ａ側）まで延設されている。すなわち、従来の低温液体貯蔵用タンクＡでは、底部ヒータ９が防液堤３の内面３ｂまでの中央部側Ｓ１の範囲に設けられているのに対し、本実施形態の低温液体貯蔵用タンクＢでは、底部ヒータ１０が底版２の端部側Ｓ２までの広範に配置されている。   On the other hand, in the low-temperature liquid storage tank B of the present embodiment, the bottom heater 10 is located not only in the central part S1 directly below the storage tank 4 and the liquid breakwater 3 but up to the inner surface 3b of the liquid breakwater 3 as well as this central portion. It extends from the side S1 to the end side S2 of the bottom slab 2 on which the PC steel material 8 is disposed (the end 2a side of the bottom slab 2 radially outside the inner surface 3b of the liquid barrier 3). That is, in the conventional cryogenic liquid storage tank A, the bottom heater 9 is provided in the range of the central portion side S1 up to the inner surface 3b of the breakwater 3, whereas the cryogenic liquid storage tank B of the present embodiment. Then, the bottom part heater 10 is arrange | positioned widely to the edge part side S2 of the base 2.

そして、このように構成した本実施形態の低温液体貯蔵用タンクＢにおいては、従来、防液堤３の内面３ｂまでの範囲に配置されている底部ヒータを底版２のＰＣ鋼材８が配置されている端部側Ｓ２まで延ばしたことで、この底部ヒータ１０によって底版２の端部側Ｓ２の温度を制御することが可能になる。これにより、底版２の端部側Ｓ３が夏に膨張、冬に収縮する量を小さくでき、これに伴って底版２の中央部側Ｓ１や端部側Ｓ２に発生する軸引張力を低減できる。   And in the cryogenic liquid storage tank B of the present embodiment configured as described above, the PC steel material 8 of the bottom slab 2 is conventionally disposed as the bottom heater disposed in the range up to the inner surface 3b of the liquid barrier 3. By extending to the end portion side S <b> 2, the bottom heater 10 can control the temperature of the end portion side S <b> 2 of the bottom plate 2. As a result, the amount that the end portion S3 of the bottom plate 2 expands in the summer and contracts in the winter can be reduced, and the axial tensile force generated on the center side S1 and the end side S2 of the bottom plate 2 can be reduced accordingly.

よって、従来、底版２の中央部側Ｓ１や端部側Ｓ２に発生する軸引張力を打ち消すために配置していたＰＣ鋼材を削減でき、底版２の端部側Ｓ２に配置するＰＣ鋼材８を削減することが可能になる。   Therefore, it is possible to reduce the amount of PC steel that has been conventionally arranged to cancel the axial tensile force generated on the center side S1 and the end side S2 of the bottom plate 2, and the PC steel material 8 arranged on the end side S2 of the bottom plate 2 can be reduced. It becomes possible to reduce.

言い換えると、本実施形態の低温液体貯蔵用タンクＢにおいては、底版２の端部側Ｓ２の温度を底部ヒータ１０で制御するようにしたことで、底版２の端部側Ｓ２に配置するＰＣ鋼材８を削減することができ、この底版２の端部側Ｓ２に配置するＰＣ鋼材８を削減できることで、確実に底部ヒータ１０を底版２の端部側Ｓ２まで延ばし、底版２の端部側Ｓ２の温度を制御することが可能になる。   In other words, in the cryogenic liquid storage tank B of the present embodiment, the temperature of the end side S2 of the bottom plate 2 is controlled by the bottom heater 10, so that the PC steel material disposed on the end side S2 of the bottom plate 2 is used. 8 can be reduced, and the PC steel material 8 disposed on the end side S2 of the bottom plate 2 can be reduced, so that the bottom heater 10 is surely extended to the end side S2 of the bottom plate 2, and the end side S2 of the bottom plate 2 is obtained. It becomes possible to control the temperature.

また、本実施形態の低温液体貯蔵用タンクＢにおいて、底部ヒータ１０がブラインヒータの場合には、温水の温度を適度に調節することで、温度が低いところは高く、高いところは低くでき、底版２の温度を平均化できる。   Further, in the low-temperature liquid storage tank B of the present embodiment, when the bottom heater 10 is a brine heater, by adjusting the temperature of the hot water appropriately, the low temperature can be high and the high can be low. Two temperatures can be averaged.

以上、本発明に係る低温液体貯蔵用タンクの一実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。   As mentioned above, although one embodiment of the cryogenic liquid storage tank according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the scope of the present invention.

例えば、本実施形態では、従来、防液堤３の内面３ｂまでの範囲に配置されている底部ヒータを底版２のＰＣ鋼材８が配置されている端部側Ｓ２まで延ばすようにした。これに対し、従来と同様に底部ヒータが底版２の中央部側Ｓ１から防液堤３の内面３ｂまで延設されるとともに、底版２の端部側Ｓ２に別系統の底部ヒータが配設されていてもよい。そして、この場合においても、本実施形態と同様、底版２の端部側Ｓ２に別系統の底部ヒータを配置したことで、底部ヒータによって底版２の端部側Ｓ２の温度を制御することが可能になり、底版２の端部側Ｓ２が夏に膨張、冬に収縮する量を小さくでき、これに伴って底版２の中央部側Ｓ１や端部側Ｓ２に発生する軸引張力を低減できる。   For example, in the present embodiment, conventionally, the bottom heater disposed in the range up to the inner surface 3b of the liquid barrier 3 is extended to the end side S2 where the PC steel material 8 of the bottom plate 2 is disposed. On the other hand, the bottom heater extends from the center side S1 of the bottom slab 2 to the inner surface 3b of the breakwater 3 as in the prior art, and a separate bottom heater is disposed on the end side S2 of the bottom slab 2. It may be. In this case as well, as in this embodiment, the temperature of the end side S2 of the bottom slab 2 can be controlled by the bottom heater by arranging another bottom heater on the end side S2 of the bottom slab 2. Thus, the amount of expansion of the end side S2 of the bottom plate 2 in summer and contraction in winter can be reduced, and the axial tensile force generated on the center side S1 and end side S2 of the bottom plate 2 can be reduced accordingly.

１ 低温液体
２ 底版
２ａ 端部
３ 防液堤
３ａ 下端部
３ｂ 内面
４ 貯槽（内槽）
５ 屋根
６ 保冷材
７ ＰＣ鋼材
８ ＰＣ鋼材
９ 従来の底部ヒータ
１０ 底部ヒータ
Ａ 従来の低温液体貯蔵用タンク
Ｂ 低温液体貯蔵用タンク
Ｇ 地盤
Ｓ１ 底版の中央部側
Ｓ２ 底版の端部側 DESCRIPTION OF SYMBOLS 1 Low temperature liquid 2 Bottom plate 2a End part 3 Breakwater 3a Lower end part 3b Inner surface 4 Storage tank (inner tank)
5 Roof 6 Coolant 7 PC Steel 8 PC Steel 9 Conventional Bottom Heater 10 Bottom Heater A Conventional Low Temperature Liquid Storage Tank B Low Temperature Liquid Storage Tank G Ground S1 Bottom Plate Center Side S2 Bottom Plate End Side

Claims (2)

底版と、該底版に下端部を剛結して立設した筒状の防液堤と、前記底版と前記防液堤で囲まれた内部に配設され、低温液体を貯蔵するための貯槽とを備える低温液体貯蔵用タンクであって、
前記底版には、端部側に周方向に延在してプレストレスを導入するＰＣ鋼材が配設されるとともに、貯蔵した前記低温液体によって周辺地盤が凍結膨張することを防止するための底部ヒータが埋設され、
前記底部ヒータが前記底版の中央部側から前記底版の端部側まで延設されている、あるいは前記底部ヒータが前記底版の中央部側から前記防液堤の内面まで延設されるとともに、前記底版の端部側に別系統の底部ヒータが配設されていることを特徴とする低温液体貯蔵用タンク。 A bottom slab, a cylindrical liquid breakwater erected with a bottom end rigidly connected to the bottom slab, a storage tank for storing a cryogenic liquid disposed inside the bottom slab and the liquid breakwater, and A cryogenic liquid storage tank comprising:
The bottom plate is provided with a PC steel material that extends in the circumferential direction on the end side and introduces prestress, and a bottom heater for preventing the surrounding ground from freezing and expanding by the stored low-temperature liquid Is buried,
The bottom heater is extended from the center side of the bottom plate to the end side of the bottom plate, or the bottom heater is extended from the center side of the bottom plate to the inner surface of the liquid barrier, A cryogenic liquid storage tank, wherein a bottom heater of another system is disposed on an end side of the bottom plate. 請求項１記載の低温液体貯蔵用タンクにおいて、
前記底部ヒータがブレインヒータであることを特徴とする低温液体貯蔵用タンク。 The cryogenic liquid storage tank according to claim 1,
A cryogenic liquid storage tank, wherein the bottom heater is a brain heater.
JP2012145611A 2012-06-28 2012-06-28 Low-temperature liquid storage tank Pending JP2014008984A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58163799U (en) * 1982-04-28 1983-10-31 石川島播磨重工業株式会社 Low temperature tank bottom plate
JPH0694197A (en) * 1991-12-27 1994-04-05 Ishii Iron Works Co Ltd Bottom heater for cold storage tank
JP2009299749A (en) * 2008-06-12 2009-12-24 Shimizu Corp Heat reserving structure of anchor part of aboveground low temperature tank

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58163799U (en) * 1982-04-28 1983-10-31 石川島播磨重工業株式会社 Low temperature tank bottom plate
JPH0694197A (en) * 1991-12-27 1994-04-05 Ishii Iron Works Co Ltd Bottom heater for cold storage tank
JP2009299749A (en) * 2008-06-12 2009-12-24 Shimizu Corp Heat reserving structure of anchor part of aboveground low temperature tank

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