JP6086187B2 - Cryogenic liquid storage tank - Google Patents

Cryogenic liquid storage tank Download PDF

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JP6086187B2
JP6086187B2 JP2012152884A JP2012152884A JP6086187B2 JP 6086187 B2 JP6086187 B2 JP 6086187B2 JP 2012152884 A JP2012152884 A JP 2012152884A JP 2012152884 A JP2012152884 A JP 2012152884A JP 6086187 B2 JP6086187 B2 JP 6086187B2
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bottom plate
storage tank
cryogenic liquid
liquid storage
electric heater
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JP2014015963A (en
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藤永　友三郎
友三郎 藤永
伊藤　健二
健二 伊藤
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Shimizu Corp
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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４及び図５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 FIGS. 4 and 5, 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) has a bottom plate 2 and A cylindrical breakwater 3 erected by connecting the lower end 3 a to the bottom plate 2, and a metal storage tank (inner tank) 4 disposed inside the bottom plate 2 and the breakwater 3. There is something that is configured with. 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（不図示）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。   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, and by introducing prestress with a PC steel material (not shown) arranged in the circumferential direction, the cryogenic liquid 1 can be reliably held at the time of leakage. I am doing so.

また、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８が埋設されている。（例えば、特許文献２参照）。底部ヒータ８としては、温水管を用いたブラインヒータ、電気ヒータ等が用いられている。そして、従来、底部ヒータ８として電気ヒータを用いる場合には、図５に示すように、底版２の上下面に沿う水平方向の一方向Ｔ１に直線状に配設されるとともに、水平方向の一方向Ｔ１に直交する他方向Ｔ２に所定の間隔をあけて平行に複数配設される。また、底版２の片側の端部２ａに配線の接続端子（端子）９が設けられ、電気ヒータ８は、一端８ａを接続端子９に接続し、他端８ｂが底版２の端部２ａ付近に位置するように、水平方向の一方向Ｔ１に延設される。   In addition, a bottom heater 8 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). As the bottom heater 8, a brine heater using a hot water pipe, an electric heater or the like is used. Conventionally, when an electric heater is used as the bottom heater 8, as shown in FIG. 5, the bottom heater 2 is linearly arranged in one horizontal direction T1 along the upper and lower surfaces of the bottom plate 2, and the horizontal heater A plurality are arranged in parallel at a predetermined interval in another direction T2 orthogonal to the direction T1. Also, a wiring connection terminal (terminal) 9 is provided at one end portion 2 a of the bottom plate 2, and the electric heater 8 has one end 8 a connected to the connection terminal 9 and the other end 8 b near the end portion 2 a of the bottom plate 2. It extends in one horizontal direction T1 so as to be positioned.

また、底版２の端部（周端部）２ａ側は、外気温や底部ヒータ８の加温によって、夏季に膨張が生じ、これに伴い底版２の中央部２ｂ側には軸引張力が発生する。また、漏液時に低温液体１を保持できるように、底版２には常に圧縮領域を確保しておく必要がある。このため、底版２の端部２ａ側にも、周方向にＰＣ鋼材１０を配置してプレストレスを導入し、軸引張力を打ち消すことで圧縮領域を確保できるようにしている。   Further, the end (peripheral end) 2a side of the bottom slab 2 expands in the summer due to the outside air temperature or the heating of the bottom heater 8, and accordingly, an axial tensile force is generated on the central part 2b side of the bottom slab 2. To do. Moreover, it is necessary to always ensure a compression area | region in the bottom plate 2 so that the cryogenic liquid 1 can be hold | maintained at the time of a liquid leak. For this reason, the PC steel material 10 is also arranged in the circumferential direction on the end 2a side of the bottom slab 2 so that prestress is introduced and the axial tension force is canceled to secure a compression region.

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

一方、底部ヒータ８として電気ヒータを用いた場合には、常に温めることになる。このため、底部ヒータ８として電気ヒータを用いた場合には、夏季に、外気温の影響を向ける底版２の端部２ａ側の温度が電気ヒータ８の発熱によりさらに高くなり、これに伴い底版２の中央部２ｂ側の軸引張力が大きくなる。これにより、従来では、軸引張力を打ち消すために、底版２の端部２ａ側にＰＣ鋼材１０を多く設ける必要が生じていた。   On the other hand, when an electric heater is used as the bottom heater 8, it is always warmed. For this reason, when an electric heater is used as the bottom heater 8, the temperature on the end 2a side of the bottom plate 2 to which the influence of the outside air temperature is further increased in summer due to the heat generated by the electric heater 8, and accordingly, the bottom plate 2 The axial tensile force on the central portion 2b side of the is increased. Thus, conventionally, it has been necessary to provide a large amount of the PC steel material 10 on the end 2a side of the bottom plate 2 in order to cancel the axial tensile force.

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、円盤状の底版と、該底版に下端部を剛結して立設された筒状の防液堤と、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、前記底版内に埋設され、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電気ヒータとを備える低温液体貯蔵用タンクであって、前記電気ヒータは、水平方向に直線状に延設されるとともに、水平方向に所定の間隔をあけ、平行に複数配設されており、各電気ヒータは、前記底版の端部側に設けられた接続端子に一端を接続し、他端を前記防液堤の外面よりも内側の範囲で、且つ前記防液堤の直下に配して設けられていることを特徴とする。 The low-temperature liquid storage tank of the present invention includes a disk-shaped bottom plate, a cylindrical liquid breakwater standing uprightly connected to the bottom plate, and an interior surrounded by the bottom plate and the liquid breakwater. And a storage tank for storing the cryogenic liquid, and an electric heater embedded in the bottom plate and for preventing the surrounding ground from freezing and expanding by the stored cryogenic liquid. The electric heaters extend in a straight line in the horizontal direction, and are arranged in parallel at predetermined intervals in the horizontal direction. Each electric heater is arranged at the end side of the bottom plate. One end is connected to the connection terminal provided on the other side, and the other end is provided in a range inside the outer surface of the liquid breakwater and directly below the liquid breakwater .

この発明においては、複数の電気ヒータがそれぞれ、従来と同様にその一端を底版の端部側に配しているのに対し、他端を防液堤で囲まれた範囲（防液堤の外面よりも内側の範囲）に配置して設けられているため、底版の端部側における電気ヒータの発熱量を従来の半分にすることができる。 In the present invention, each of the plurality of electric heaters has one end disposed on the end side of the bottom plate as in the conventional case, while the other end is surrounded by the liquid breakwater (the outer surface of the liquid breakwater). since is provided disposed inside range) than the amount of heat generated by the electric heater at the end side of the bottom plate can be of conventional half.

また、本発明の低温液体貯蔵用タンクは、複数の電気ヒータはそれぞれ、前記底版の端部側に配される一端側と他端側の少なくとも一方を前記底版の軸中心の放射方向に折り曲げて配設されていることが望ましい。 In the cryogenic liquid storage tank according to the present invention, each of the plurality of electric heaters bends at least one of the one end side and the other end side arranged on the end side of the bottom plate in the radial direction of the axis center of the bottom plate. It is desirable that they are arranged .

この発明においては、複数の電気ヒータがそれぞれ、底版の端部側に配される一端側と他端側の少なくとも一方を放射方向に折り曲げて配設されていることにより、従来のように水平の一方向に延びる直線状に電気ヒータを配設する場合と比較し、電気ヒータ全体の長さを短くすることができ、底版の端部側での単位面積当たりの熱量を減少させることができる。   In the present invention, each of the plurality of electric heaters is arranged by bending at least one of the one end side and the other end side arranged on the end side of the bottom plate in the radial direction, so that the horizontal heater as in the prior art is provided. Compared with the case where the electric heater is arranged in a straight line extending in one direction, the entire length of the electric heater can be shortened, and the amount of heat per unit area on the end side of the bottom plate can be reduced.

本発明の低温液体貯蔵用タンクにおいては、従来と比較し、底版の端部側における電気ヒータの発熱量を少なくすることができる。これにより、底部ヒータとして電気ヒータを用いた場合であっても、底版の中央部側に生じる軸引張力を緩和することができ、この軸引張力を打ち消すためのＰＣ鋼材の配置数を削減することが可能になる。   In the cryogenic liquid storage tank of the present invention, the amount of heat generated by the electric heater on the end side of the bottom plate can be reduced as compared with the conventional one. As a result, even when an electric heater is used as the bottom heater, the axial tensile force generated on the center side of the bottom plate can be relaxed, and the number of PC steel materials disposed to counteract this axial tensile force is reduced. It becomes possible.

本発明の第１実施形態に係る低温液体貯蔵用タンクの底版に埋設される電気ヒータの配置状態を示す断面図である。It is sectional drawing which shows the arrangement | positioning state of the electric heater embed | buried under the bottom plate of the cryogenic liquid storage tank which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る低温液体貯蔵用タンクの底版に埋設される電気ヒータの配置状態を示す断面図である。It is sectional drawing which shows the arrangement | positioning state of the electric heater embed | buried under the bottom plate of the cryogenic liquid storage tank which concerns on 2nd Embodiment of this invention. 本発明の第２実施形態に係る低温液体貯蔵用タンクの変形例を示す断面図である。It is sectional drawing which shows the modification of the cryogenic liquid storage tank which concerns on 2nd Embodiment of this invention. 低温液体貯蔵用タンクを示す側断面図である。It is a sectional side view which shows the tank for low-temperature liquid storage. 従来の低温液体貯蔵用タンクの底版に埋設される電気ヒータの配置状態を示す断面図である。It is sectional drawing which shows the arrangement | positioning state of the electric heater embed | buried under the bottom plate of the conventional cryogenic liquid storage tank.

以下、図１（及び図４）を参照し、本発明の第１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, the cryogenic liquid storage tank according to the first embodiment of the present invention will be described with reference to FIG. 1 (and FIG. 4). 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４に示すように、従来の低温液体貯蔵用タンクＡと同様、円盤状の底版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（不図示）と鉛直方向に配置したＰＣ鋼材（不図示）によって、周方向と鉛直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. 4, the cryogenic liquid storage tank B of the present embodiment comprises a disk-shaped bottom plate 2, a cylindrical liquid barrier 3, and a cryogenic liquid 1, as in the conventional cryogenic liquid storage tank A. The metal storage tank 4 to store, the roof 5, and the cold insulating material 6 are comprised. Further, the breakwater 3 is constructed by introducing prestress in the circumferential direction and the vertical direction, respectively, by a PC steel material (not shown) arranged in the circumferential direction and a PC steel material (not shown) arranged in the vertical direction. .

また、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８を埋設して構築されている。さらに、底版２の端部２ａ側に、漏液時に低温液体１を確実に保持するためのＰＣ鋼材１０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１０によって端部２ａ側にプレストレスが導入されている。   The bottom plate 2 is constructed by embedding a bottom heater 8 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 10 for reliably holding the cryogenic liquid 1 at the time of leakage is disposed on the end 2a side of the bottom plate 2 along the circumferential direction, and the end portion is formed by the PC steel material 10 extending in the circumferential direction. Prestress is introduced on the 2a side.

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８として電気ヒータが用いられ、電気ヒータ８は、水平方向の一方向Ｔ１に直線状に配設されるとともに、水平方向の一方向Ｔ１に直交する他方向Ｔ２に所定の間隔をあけ、平行に複数配設されている。また、このとき、各電気ヒータ８は、底版２の端部２ａ側に設けられた配線の接続端子（端子）９に一端８ａを接続し、他端８ｂを防液堤３の外面３ｂよりも内側の範囲（防液堤３で囲まれた範囲）に配して設けられている。なお、本実施形態では、各電気ヒータ８が平面視で防液堤３の内面３ｃの位置（防液堤３の直下）に他端８ｂを配して設けられている。さらに、底版２の軸Ｏ１を境に左右両側に配線の接続端子９が設けられ、隣り合う電気ヒータ８が左右の異なる側の接続端子９に一端８ａを接続して配設されている。 On the other hand, in the cryogenic liquid storage tank B of the present embodiment, an electric heater is used as the bottom heater 8, and the electric heater 8 is linearly arranged in one horizontal direction T1 and one horizontal direction. A plurality are arranged in parallel at a predetermined interval in another direction T2 orthogonal to T1. At this time, each electric heater 8 has one end 8 a connected to a connection terminal (terminal) 9 of the wiring provided on the end 2 a side of the bottom plate 2, and the other end 8 b more than the outer surface 3 b of the liquid barrier 3. It is arranged in the inner area (the area surrounded by the breakwater 3) . In the present embodiment, each electric heater 8 is provided with the other end 8b disposed at the position of the inner surface 3c of the liquid barrier 3 (directly below the liquid barrier 3 ) in plan view. Further, wiring connection terminals 9 are provided on both the left and right sides of the axis O1 of the bottom plate 2, and adjacent electric heaters 8 are arranged with one end 8a connected to the connection terminals 9 on the left and right sides.

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、底版２の端部２ａまで他端８ｂを延ばして電気ヒータ８を配設した従来と比較し、他端８ｂを防液堤３の外面３ｂよりも内側の範囲（防液堤３の直下、防液堤３で囲まれた範囲）に配して電気ヒータ８が設けられているため、底版２の端部２ａ側における電気ヒータ８の発熱量を従来の半分にすることができる。 In the cryogenic liquid storage tank B of this embodiment configured as described above, the other end 8b is prevented as compared with the conventional case where the other end 8b is extended to the end 2a of the bottom plate 2 and the electric heater 8 is disposed. Since the electric heater 8 is provided in a range inside the outer surface 3b of the liquid bank 3 (a range directly below the liquid bank 3 and surrounded by the liquid bank 3), the end 2a side of the bottom plate 2 is provided. The amount of heat generated by the electric heater 8 can be halved compared to the conventional method.

よって、本実施形態の低温液体貯蔵用タンクＢによれば、従来と比較し、底版２の端部２ａ側における電気ヒータ８の発熱量を少なくすることができ、これにより、底部ヒータとして電気ヒータ８を用いた場合であっても、底版２の中央部２ｂ側に生じる軸引張力を緩和することができ、この軸引張力を打ち消すためのＰＣ鋼材１０の配置数を削減することが可能になる。   Therefore, according to the low-temperature liquid storage tank B of the present embodiment, the amount of heat generated by the electric heater 8 on the end 2a side of the bottom plate 2 can be reduced as compared with the conventional case. Even when 8 is used, the axial tensile force generated on the central portion 2b side of the bottom plate 2 can be relaxed, and the number of PC steel members 10 arranged to cancel the axial tensile force can be reduced. Become.

次に、図２（及び図４）を参照し、本発明の第２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、第１実施形態と同様、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。   Next, a cryogenic liquid storage tank according to a second embodiment of the present invention will be described with reference to FIG. 2 (and FIG. 4). As in the first embodiment, the present embodiment relates to a tank used for storing a cryogenic liquid such as liquefied natural gas.

図４に示すように、本実施形態の低温液体貯蔵用タンクＣは、第１実施形態と同様に、円盤状の底版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。   As shown in FIG. 4, the cryogenic liquid storage tank C of the present embodiment is similar to the first embodiment in that the disk-shaped bottom plate 2, the cylindrical breakwater 3 and the metal for storing the cryogenic liquid 1 are used. The storage tank 4 made of the product, the roof 5, and the cold insulating material 6 are provided.

また、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８を埋設して構築され、本実施形態においても、この底部ヒータ８として電気ヒータが用いられている。さらに、底版２の端部２ａ側に、ＰＣ鋼材１０が周方向に沿って配設され、底版２の端部２ａ側にプレストレスが導入されている。   The bottom plate 2 is constructed by embedding a bottom heater 8 for preventing the surrounding ground G from being frozen and expanded by the low temperature liquid 1 stored in the storage tank 4. A heater is used. Further, the PC steel material 10 is disposed along the circumferential direction on the end 2 a side of the bottom plate 2, and prestress is introduced on the end 2 a side of the bottom plate 2.

一方、本実施形態の低温液体貯蔵用タンクＣでは、電気ヒータ８が、防液堤３の内部に配された中央部２ｂ側で、水平方向の一方向Ｔ１に沿って直線状に配設されるとともに、水平方向の他方向Ｔ２に所定の間隔をあけ、平行に複数配設されている。さらに、複数の電気ヒータはそれぞれ、底版２の端部２ａ側に配される一端８ａ側と他端８ｂ側の両端側を底版２の軸Ｏ１中心の放射方向に折り曲げて直線状に底版２の端部２ａ（防液堤３）まで最短距離になるように配設されている。なお、各電気ヒータ８の一端８ａ及び他端８ｂの両端は、底版２の端部２ａ（近傍）に配され、一端８ａが底版２の端部２ａ側に設けられた配線の接続端子９に接続されている。また、複数の電気ヒータ８は、隣り合う電気ヒータ８が左右の異なる側の接続端子９に一端８ａを接続するようにして配設されている。 On the other hand, in the cryogenic liquid storage tank C of the present embodiment, the electric heater 8 is linearly arranged along one horizontal direction T <b> 1 on the central portion 2 b side arranged inside the liquid barrier 3. In addition, a plurality are arranged in parallel at predetermined intervals in the other direction T2 in the horizontal direction. Furthermore, each of the plurality of electric heaters bends both ends of the one end 8a side and the other end 8b side arranged on the end 2a side of the bottom plate 2 in the radial direction about the axis O1 of the bottom plate 2 to form a straight line of the bottom plate 2. It arrange | positions so that it may become the shortest distance to the edge part 2a (breakwater 3) . Note that both ends of one end 8a and the other end 8b of each electric heater 8 are arranged at the end 2a (near) of the bottom plate 2, and one end 8a is connected to the connection terminal 9 of the wiring provided on the end 2a side of the bottom plate 2. It is connected. The plurality of electric heaters 8 are arranged such that adjacent electric heaters 8 connect one end 8a to connection terminals 9 on the left and right different sides.

また、本実施形態の低温液体貯蔵用タンクＣにおいては、電気ヒータ８の両端８ａ、８ｂ側を放射方向に折り曲げることで、発熱量が少なくなる範囲に電気ヒータ１１を追加し、発熱量を補うようにしている。そして、本実施形態では、この追加の電気ヒータ１１が、防液堤３の内面３ｃ付近の底版２に埋設するとともに、この内面３ｃに沿って円周状に配設するようにしている。   Further, in the low-temperature liquid storage tank C of the present embodiment, the electric heater 11 is added in a range where the amount of heat generation is reduced by bending both ends 8a and 8b of the electric heater 8 in the radial direction, thereby supplementing the heat generation amount. I am doing so. In this embodiment, the additional electric heater 11 is embedded in the bottom plate 2 in the vicinity of the inner surface 3c of the liquid barrier 3 and arranged circumferentially along the inner surface 3c.

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Ｃにおいては、底版２の端部２ａから端部２ａまで水平方向の一方向Ｔ１に直線状に延ばして電気ヒータ８を配設した従来と比較し、複数の電気ヒータ８がそれぞれ、底版２の端部２ａ側に配される両端８ａ、８ｂ側を放射方向に折り曲げて配設されていることにより、複数の電気ヒータ８全体の長さを短くすることができ、底版２の端部２ａ側での単位面積当たりの熱量を減少させることができる。   In the cryogenic liquid storage tank C of the present embodiment configured as described above, the electric heater 8 is provided so as to extend linearly in one horizontal direction T1 from the end 2a to the end 2a of the bottom plate 2. Compared with the prior art, a plurality of electric heaters 8 are arranged by bending both ends 8a, 8b arranged on the end 2a side of the bottom plate 2 in the radial direction, so that the whole of the plurality of electric heaters 8 The length can be shortened, and the amount of heat per unit area on the end 2a side of the bottom plate 2 can be reduced.

よって、本実施形態の低温液体貯蔵用タンクＣによれば、第１実施形態と同様に、従来と比較し、底版２の端部２ａ側における電気ヒータ８の発熱量を少なくすることができ、これにより、底部ヒータとして電気ヒータ８を用いた場合であっても、底版２の中央部２ｂ側に生じる軸引張力を緩和することができ、この軸引張力を打ち消すためのＰＣ鋼材１０の配置数を削減することが可能になる。   Therefore, according to the low-temperature liquid storage tank C of the present embodiment, the amount of heat generated by the electric heater 8 on the end 2a side of the bottom plate 2 can be reduced as compared with the conventional case, as in the first embodiment. Thereby, even if it is a case where the electric heater 8 is used as a bottom part heater, the axial tension force which arises in the center part 2b side of the base 2 can be relieved, and arrangement | positioning of PC steel material 10 for negating this axial tension force The number can be reduced.

以上、本発明に係る低温液体貯蔵用タンクの第１、第２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。   The first and second embodiments of the cryogenic liquid storage tank according to the present invention have been described above. However, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the spirit of the present invention. is there.

例えば、第２実施形態では、複数の電気ヒータがそれぞれ、底版２の端部２ａ側に配される一端８ａ側と他端８ｂ側の両端側を底版２の軸Ｏ１中心の放射方向に折り曲げて配設されているものとして説明を行った。   For example, in the second embodiment, each of the plurality of electric heaters bends both ends on one end 8a side and the other end 8b side arranged on the end 2a side of the bottom plate 2 in the radial direction about the axis O1 of the bottom plate 2. The description has been made assuming that it is disposed.

これに対し、本発明においては、図３に示すように、複数の電気ヒータがそれぞれ、底版２の端部２ａ側に配される一端８ａ側と他端８ｂ側の少なくとも一方を（図３では一端８ａ側）底版２の軸Ｏ１中心の放射方向に折り曲げて配設するようにしてもよい。そして、この場合においても、第２実施形態と同様、複数の電気ヒータ８がそれぞれ、底版２の端部２ａ側に配される一端８ａ側を放射方向に折り曲げて配設されていることにより、複数の電気ヒータ８全体の長さを短くすることができ、底版２の端部２ａ側での単位面積当たりの熱量を減少させることができる。さらに、必要によっては他端８ｂ側を、第１の実施形態のように防液堤３の外面３ｂよりも内側の範囲に配してもよい。これにより、さらに底版２の端部２ａにおける発熱量を少なくすることができる。よって、やはり、第１実施形態と同様に、従来と比較し、底版２の端部２ａ側における電気ヒータ８の発熱量を少なくすることができ、これにより、底部ヒータとして電気ヒータ８を用いた場合であっても、底版２の中央部２ｂ側に生じる軸引張力を緩和することができ、この軸引張力を打ち消すためのＰＣ鋼材１０の配置数を削減することが可能になる。   On the other hand, in the present invention, as shown in FIG. 3, each of the plurality of electric heaters has at least one of the one end 8a side and the other end 8b side disposed on the end 2a side of the bottom plate 2 (in FIG. One end 8a side) The bottom plate 2 may be bent and arranged in the radial direction of the center of the axis O1. In this case as well, as in the second embodiment, each of the plurality of electric heaters 8 is disposed by bending one end 8a disposed on the end 2a side of the bottom plate 2 in the radial direction. The overall length of the plurality of electric heaters 8 can be shortened, and the amount of heat per unit area on the end 2a side of the bottom plate 2 can be reduced. Further, if necessary, the other end 8b side may be arranged in a range on the inner side of the outer surface 3b of the liquid barrier 3 as in the first embodiment. This further reduces the amount of heat generated at the end 2a of the bottom plate 2. Therefore, as in the first embodiment, the amount of heat generated by the electric heater 8 on the end 2a side of the bottom slab 2 can be reduced as compared with the prior art, whereby the electric heater 8 is used as the bottom heater. Even in this case, the axial tensile force generated on the side of the central portion 2b of the bottom slab 2 can be relaxed, and the number of PC steel materials 10 for canceling the axial tensile force can be reduced.

１ 低温液体
２ 底版
２ａ 端部（周端部）
２ｂ 中央部
３ 防液堤
３ａ 下端部
３ｂ 外面
３ｃ 内面
４ 貯槽
５ 屋根
６ 保冷材
８ 電気ヒータ（底部ヒータ）
８ａ 一端
８ｂ 他端
９ 接続端子
１０ ＰＣ鋼材
１１ 電気ヒータ
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
Ｃ 低温液体貯蔵用タンク
Ｏ１ 軸 1 Cryogenic liquid 2 Bottom plate 2a End (peripheral end)
2b Central part 3 Liquid barrier 3a Lower end part 3b Outer surface 3c Inner surface 4 Storage tank 5 Roof 6 Coolant 8 Electric heater (bottom heater)
8a one end 8b other end 9 connection terminal 10 PC steel 11 electric heater A conventional cryogenic liquid storage tank B cryogenic liquid storage tank C cryogenic liquid storage tank O1 shaft

Claims (2)

円盤状の底版と、該底版に下端部を剛結して立設された筒状の防液堤と、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、前記底版内に埋設され、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電気ヒータとを備える低温液体貯蔵用タンクであって、
前記電気ヒータは、水平方向に直線状に延設されるとともに、水平方向に所定の間隔をあけ、平行に複数配設されており、
各電気ヒータは、前記底版の端部側に設けられた接続端子に一端を接続し、他端を前記防液堤の外面よりも内側の範囲で、且つ前記防液堤の直下に配して設けられていることを特徴とする低温液体貯蔵用タンク。 A disc-shaped 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 and store a cryogenic liquid A cryogenic liquid storage tank comprising: a storage tank for preventing the surrounding ground from being frozen and expanded by the stored cryogenic liquid embedded in the bottom plate,
The electric heater extends in a straight line in the horizontal direction, and at a predetermined interval in the horizontal direction, a plurality of electric heaters are arranged in parallel.
Each electric heater has one end connected to a connection terminal provided on the end side of the bottom slab, and the other end is arranged in a range inside the outer surface of the liquid breakwater and directly below the liquid breakwater. A cryogenic liquid storage tank characterized by being provided. 請求項１記載の低温液体貯蔵用タンクにおいて、
複数の電気ヒータはそれぞれ、前記底版の端部側に配される一端側と他端側の少なくとも一方を前記底版の軸中心の放射方向に折り曲げて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。 The cryogenic liquid storage tank according to claim 1,
Each of the plurality of electric heaters is disposed by bending at least one of one end side and the other end side disposed on the end side of the bottom plate in a radial direction of the axial center of the bottom plate. Storage tank.
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