JP2005247324A - Low-temperature pc tank, and method for constructing and using the same - Google Patents

Low-temperature pc tank, and method for constructing and using the same Download PDF

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Publication number
JP2005247324A
JP2005247324A JP2004055885A JP2004055885A JP2005247324A JP 2005247324 A JP2005247324 A JP 2005247324A JP 2004055885 A JP2004055885 A JP 2004055885A JP 2004055885 A JP2004055885 A JP 2004055885A JP 2005247324 A JP2005247324 A JP 2005247324A
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temperature
bottom plate
tank
side wall
low
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Fumio Kamata
文男 鎌田
Takenori Nishizaki
丈能 西崎
Tomoki Ushida
智樹 牛田
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Obayashi Corp
Osaka Gas Co Ltd
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Obayashi Corp
Osaka Gas Co Ltd
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Priority to JP2004055885A priority Critical patent/JP2005247324A/en
Priority to PCT/JP2005/002871 priority patent/WO2005082747A1/en
Publication of JP2005247324A publication Critical patent/JP2005247324A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
    • E04H7/02—Containers for fluids or gases; Supports therefor
    • E04H7/18—Containers for fluids or gases; Supports therefor mainly of concrete, e.g. reinforced concrete, or other stone-like material
    • E04H7/20—Prestressed constructions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottom structure of a low-temperature PC tank in which a sufficient prestress is introduced to the lower part of the side wall without executing troublesome work such as separation of a bottom board. <P>SOLUTION: The low-temperature PC tank 10 for storing a low-temperature liquid 21 has the bottom structure comprising the bottom board 14 integrated with a side wall 16 and a heating means 26 installed on the bottom board 14, and is further provided with a PC steel 30 for introducing the prestress to a bottom board 16 and a temperature setting section 30 for setting a heating temperature of the bottom board 16 by the heating means 26 to a temperature lower than the ambient temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、底版と側壁が一体結合した構成を有し、液化天然ガスや液化石油ガスなどの低温物質を貯蔵するための低温ＰＣタンク及び低温ＰＣタンクの構築方法に関する。   The present invention relates to a low temperature PC tank for storing a low temperature substance such as liquefied natural gas or liquefied petroleum gas, and a method for constructing a low temperature PC tank.

液化天然ガス（ＬＮＧ）や液化石油ガス（ＬＰＧ）などの低温液体を貯蔵する円筒形タンクとして、底版と側壁が一体化した構成のＰＣ（Pre-stressed Concrete）タンクが用いられる。このＰＣタンクでは、側壁の周方向及び鉛直方向にＰＣ鋼材（テンドン）によってプレストレスを導入し、このプレストレスによってタンク内部に貯蔵される液体の圧力等の荷重に対する抵抗性を確保できるようにしている。ところで、タンク内部の液体の圧力によって側壁に生ずる応力は側壁下部で最も大きくなるため、この側壁下部はタンク構造上、最も重要な部分となる。しかし、ＰＣタンクの底版と側壁とが一体化した構成では、側壁下部が底版に拘束されるため、側壁下部に十分なプレストレスを導入することは難しい。   As a cylindrical tank for storing a low temperature liquid such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG), a PC (Pre-stressed Concrete) tank having a structure in which a bottom plate and a side wall are integrated is used. In this PC tank, pre-stress is introduced by PC steel (Tendon) in the circumferential direction and vertical direction of the side wall so that resistance against a load such as pressure of liquid stored in the tank can be secured by this pre-stress. Yes. By the way, since the stress generated on the side wall by the pressure of the liquid inside the tank is the largest at the lower part of the side wall, the lower part of the side wall becomes the most important part in the tank structure. However, in the configuration in which the bottom plate and the side wall of the PC tank are integrated, it is difficult to introduce sufficient prestress to the lower side wall because the lower side wall is restrained by the bottom plate.

そこで、従来、例えば、特許文献１に開示されるように、底版の外周縁近傍位置に環状の開口部を設けることにより、底版を外周部と内周部とに分割する構成が提案されている。かかる構成によれば、底版を一体構造とする場合に比べて、底版による側壁の拘束度合いが大幅に減少し、側壁下部に十分なプレストレスを与えることが可能となる。
特公平３−２０５４８号公報 Therefore, conventionally, as disclosed in Patent Document 1, for example, a configuration in which the bottom plate is divided into an outer peripheral portion and an inner peripheral portion by providing an annular opening in the vicinity of the outer peripheral edge of the bottom plate has been proposed. . According to such a configuration, the degree of restraint of the side wall by the bottom plate is greatly reduced as compared with the case where the bottom plate has an integral structure, and sufficient prestress can be applied to the lower portion of the side wall.
Japanese Patent Publication No. 3-20548

しかしながら、上記特許文献１に記載の構成では、底版を外周部と内周部とに分割して構築しなければならない上、側壁にプレストレスを与えた後、底版の環状開口部分にコンクリートを打設して分割した外周部と内周部とを接続しなければならず、非常に手間の掛かる工事となる。   However, in the configuration described in Patent Document 1, the bottom plate must be constructed by dividing it into an outer peripheral portion and an inner peripheral portion, and after prestressing the side wall, concrete is applied to the annular opening portion of the bottom plate. It is necessary to connect the outer peripheral portion and the inner peripheral portion which are provided and divided, which is a very troublesome construction.

本発明は上記の点に鑑みてなされたものであり、底版の分割などの手間の掛かる工事を要することなく、側壁下部に十分なプレストレスを導入することが可能な低温ＰＣタンクの底部構造を提供することを目的とする。   The present invention has been made in view of the above points, and has a bottom structure of a low-temperature PC tank capable of introducing sufficient prestress to the lower portion of the side wall without requiring labor-intensive work such as dividing the bottom plate. The purpose is to provide.

上記の目的を達成するため、本発明は、底版と側壁とが一体化して構成され、前記底版内に加熱手段を備えた低温物質貯蔵用の低温ＰＣタンクであって、
前記底版にプレストレスを導入するプレストレス手段と、
前記加熱手段による前記底版の加熱温度を、建設時の環境温度よりも低温に設定する温度設定手段と、を備えることを特徴とする。 In order to achieve the above object, the present invention is a low-temperature PC tank for storing a low-temperature substance, wherein a bottom plate and a side wall are integrally formed, and heating means is provided in the bottom plate,
Prestressing means for introducing prestress into the bottom plate,
Temperature setting means for setting the heating temperature of the bottom slab by the heating means to be lower than the environmental temperature at the time of construction.

本発明によれば、ＰＣタンクの底版の温度を建設時の環境温度よりも低温に設定することにより底版を体積収縮させることで、側壁下部に効果的にプレストレスを導入できる。また、底版にプレストレスを導入するので、収縮によるコンクリートのひび割れを防止できる。なお、「建設時の環境温度」とは、ＰＣタンク完成後、貯蔵する低温物質を注入するまでの環境温度を意味する。また底版の設定温度は、管理上可能な限りで低い温度（ただし０℃以上）とすることが好ましい。   According to the present invention, prestress can be effectively introduced into the lower portion of the side wall by shrinking the volume of the bottom plate by setting the temperature of the bottom plate of the PC tank to be lower than the environmental temperature at the time of construction. Moreover, since prestress is introduced into the bottom plate, cracking of the concrete due to shrinkage can be prevented. The “environmental temperature during construction” means the environmental temperature from the completion of the PC tank to the injection of the low-temperature substance to be stored. In addition, the set temperature of the bottom plate is preferably as low as possible (however, 0 ° C. or higher) for management.

また、本発明において、前記底版は略一定の厚さを有するのがよい。このようにすれば、底版の収縮により側壁へ大きな荷重を伝達させることができるので、側壁下部へのプレストレスの導入を効果的に行うことができる。   In the present invention, the bottom plate preferably has a substantially constant thickness. In this way, since a large load can be transmitted to the side wall by contraction of the bottom plate, prestress can be effectively introduced into the lower portion of the side wall.

また、本発明は、底版と側壁とが一体化して構成され、前記底版内に加熱手段を備えた低温物質貯蔵用の低温ＰＣタンクを構築して運用する方法であって、前記底版を構築してプレストレスを導入し、この底版と一体に側壁を構築して該側壁にプレストレスを導入し、当該低温ＰＣタンクの完成後、前記低温物質の貯蔵時に前記加熱手段により前記底版を建設時の環境温度よりも低い温度に設定することを特徴とする。   Further, the present invention is a method for constructing and operating a low-temperature PC tank for storing a low-temperature substance, in which a bottom plate and a side wall are integrated, and a heating means is provided in the bottom plate, and the bottom plate is constructed. Prestress is introduced, a side wall is constructed integrally with the bottom plate, prestress is introduced into the side wall, and after completion of the low temperature PC tank, the bottom plate is constructed by the heating means during storage of the low temperature material. It is characterized by being set to a temperature lower than the environmental temperature.

本発明によれば、底版の分割などの手間の掛かる工事を要することなく、側壁下部に十分なプレストレスを導入することが可能となる。   According to the present invention, it is possible to introduce sufficient prestress to the lower portion of the side wall without requiring time-consuming work such as dividing the bottom plate.

図１は、本発明の一実施形態に係わるＰＣタンク１０の正面図であり、図中左側を鉛直断面で示している。また、図２は、ＰＣタンク１０の側壁部を拡大して示す鉛直断面図である。このＰＣタンク１０は、例えば、ＬＮＧやＬＰＧ等の低温液体２１を貯蔵する低温ＰＣタンクである。   FIG. 1 is a front view of a PC tank 10 according to an embodiment of the present invention, and the left side in the figure is shown in a vertical section. FIG. 2 is an enlarged vertical sectional view showing a side wall portion of the PC tank 10. The PC tank 10 is a low-temperature PC tank that stores a low-temperature liquid 21 such as LNG or LPG.

ＰＣタンク１０は、底版１４及び側壁１６が一体結合されたコンクリートにより構成されている。底版１４は、例えば基礎杭１８である基礎構造により地盤１２に支持されている。   The PC tank 10 is made of concrete in which a bottom plate 14 and a side wall 16 are integrally coupled. The bottom plate 14 is supported on the ground 12 by a foundation structure which is, for example, a foundation pile 18.

図２に示すように、ＰＣタンク１０の側壁１６には、テンドン１９，２０が鉛直方向及び円周方向に配置されている。これらのテンドン１９，２０により、側壁１６に鉛直方向及び周方向のプレストレスが導入されており、これによって、ＰＣタンク１０の内部に貯留される低温液体２１（ＬＮＧやＬＰＧ）の圧力等の荷重に対する抵抗性を確保できるようになっている。底版１４の上面及び側壁１６の内壁面には、保冷材２２，２４が施工され、それらの内側に低温液体２１が収容される。また、ＰＣタンク１０の上部は屋根２５で覆われている。   As shown in FIG. 2, tendons 19 and 20 are arranged on the side wall 16 of the PC tank 10 in the vertical direction and the circumferential direction. These tendons 19 and 20 introduce prestress in the vertical direction and the circumferential direction into the side wall 16, and thereby load such as pressure of the low temperature liquid 21 (LNG or LPG) stored in the PC tank 10. The resistance to can be secured. On the upper surface of the bottom plate 14 and the inner wall surface of the side wall 16, cold insulating materials 22 and 24 are applied, and the cryogenic liquid 21 is accommodated inside them. The upper part of the PC tank 10 is covered with a roof 25.

底版１４には、加熱手段２６が埋設されている。この加熱手段２６は、例えば、電熱線などの電気ヒータであってもよいし、温められた不凍液が流れる温水管であってもよい。温度設定部２８は加熱手段２６による底版１４の加熱温度を制御する。より具体的には、底版１４に不図示の温度センサが設けられており、温度設定部２８は、この温度センサによる検出温度に基づいて、加熱手段２６による底版１４の加熱温度を指定された温度に制御する。   A heating means 26 is embedded in the bottom plate 14. The heating means 26 may be, for example, an electric heater such as a heating wire or a hot water pipe through which a warmed antifreeze liquid flows. The temperature setting unit 28 controls the heating temperature of the bottom plate 14 by the heating means 26. More specifically, a temperature sensor (not shown) is provided on the bottom slab 14, and the temperature setting unit 28 is configured to specify the heating temperature of the bottom slab 14 by the heating means 26 based on the temperature detected by the temperature sensor. To control.

加熱手段２６は、ＰＣタンク１０に低温液体２１を貯蔵した際の、貯蔵液の冷熱による底版１４下部の地盤の凍結などが引き起こすタンクへの悪影響を防止する役割を有している。すなわち、ＰＣタンク１０の建設後、その中に低温液体２１が注入された際に、加熱手段２６により底版１４を加熱することにより、底版１４の温度が建設時の温度から低下することに伴ってひび割れが発生したり、底版上面が０℃以下になって底版上面にレンズ状や層状の氷が形成されたり、底版下面の地盤が凍結したりするのを防止できるのである。この加熱手段２６は本来、底版１４を構築時の温度（すなわち環境温度）とほぼ同じ温度に保つべく底版１４を加熱することにより、底版１４の温度低下によるひび割れを防ぐのであるが、本実施形態のＰＣタンク１０では、以下に説明するように、温度設定部２８によって底版１４の加熱温度を環境温度よりも十分に低い温度に設定すると共に、底版１４にＰＣ鋼材３０でプレストレスを導入することにより、底版１４にひび割れが生ずるのを防止しつつ、その体積変化を有効利用して側壁１６へのプレストレス導入を円滑に行えるようにしている。   The heating means 26 has a role of preventing adverse effects on the tank caused by freezing of the ground below the bottom slab 14 due to the cold heat of the stored liquid when the cryogenic liquid 21 is stored in the PC tank 10. That is, after the PC tank 10 is constructed, when the low temperature liquid 21 is injected into the PC tank 10, the bottom plate 14 is heated by the heating means 26, whereby the temperature of the bottom plate 14 is lowered from the temperature at the time of construction. It is possible to prevent the occurrence of cracks, the formation of lens-like or layered ice on the upper surface of the bottom plate due to the bottom plate upper surface becoming 0 ° C. or lower, and the freezing of the ground on the lower surface of the bottom plate. This heating means 26 originally prevents the crack due to a temperature drop of the bottom plate 14 by heating the bottom plate 14 so as to keep the bottom plate 14 at substantially the same temperature as that at the time of construction (that is, the environmental temperature). In the PC tank 10, as described below, the heating temperature of the bottom slab 14 is set to a temperature sufficiently lower than the environmental temperature by the temperature setting unit 28, and prestress is introduced to the bottom slab 14 with the PC steel material 30. As a result, cracks are prevented from occurring in the bottom plate 14 and prestressing can be smoothly introduced into the side wall 16 by effectively utilizing the volume change.

図３は、底版１４にプレストレスを導入するための構造を示す斜視図である。同図に示すように、底版１４の内部にはＰＣ鋼材３０が平面二方向に配置されている。これらのＰＣ鋼材３０に張力が掛けられて、各ＰＣ鋼材３０の端部が底版１４の外周面に定着されることにより、底版１４に面内方向のプレストレスが導入される。   FIG. 3 is a perspective view showing a structure for introducing prestress into the bottom plate 14. As shown in the figure, PC steel materials 30 are arranged in two planes inside the bottom plate 14. By applying tension to the PC steel materials 30 and fixing the end portions of the PC steel materials 30 to the outer peripheral surface of the bottom plate 14, in-plane prestress is introduced into the bottom plate 14.

本実施形態のＰＣタンク１０を構築する場合、地盤に基礎杭１８などの基礎を構築し、その上に、底版１４のコンクリートを、ＰＣ鋼材３０及び加熱手段２６が内部に埋め込まれるように打設する。更に、側壁１６のコンクリートを底版１４と一体に、テンドン１９，２０が埋め込まれるように下部から上部へ順次打設し、テンドン１９，２０に張力を掛けて定着することにより側壁１６にプレストレスを導入する。なお、ＰＣ鋼材３０による底版１４へのプレストレスの導入のタイミングは任意であるが、好ましくは側壁１６の最下部のコンクリートを打設したタイミングでプレストレス導入を行うものとする。その理由は、側壁１６のコンクリート打設後に発熱した後、冷却される過程で収縮することにより側壁１６にひび割れが生じ易いが、その際に底版１４にプレストレスを導入すれば、側壁１６の収縮を拘束する底版１４が収縮することにより側壁１６を拘束する度合いが低下して、側壁１６のひび割れを抑える効果が期待できるからである。   When constructing the PC tank 10 of this embodiment, a foundation such as the foundation pile 18 is constructed on the ground, and the concrete of the bottom slab 14 is placed thereon so that the PC steel 30 and the heating means 26 are embedded therein. To do. Further, the concrete of the side wall 16 is integrally cast with the bottom plate 14 from the lower part to the upper part so that the tendons 19 and 20 are embedded, and tension is applied to the tendons 19 and 20 to fix them. Introduce. In addition, although the timing of the introduction of the prestress to the bottom plate 14 by the PC steel material 30 is arbitrary, the prestress is preferably introduced at the timing when the lowermost concrete of the side wall 16 is placed. The reason for this is that cracks are likely to occur in the side wall 16 due to shrinkage in the process of cooling after the concrete is cast on the side wall 16, but if prestress is introduced into the bottom plate 14 at that time, the side wall 16 contracts. This is because the degree of restraining the side wall 16 is reduced due to the contraction of the bottom plate 14 that restrains the crack, and the effect of suppressing cracking of the side wall 16 can be expected.

こうして側壁１６のコンクリートを打設した後、屋根２５及び保冷材２２，２４を施工して、ＰＣタンク１０が完成する。そして、完成したＰＣタンク１０の内部を冷却し、その後に貯蔵する低温液体２１を注ぎ入れる。その際、底版１４に埋め込んだ加熱手段２６により底版１４を加熱して、底版１４の温度低下を抑える。   After placing the concrete of the side wall 16 in this way, the roof 25 and the cold insulation materials 22 and 24 are installed, and the PC tank 10 is completed. And the inside of the completed PC tank 10 is cooled, and the cryogenic liquid 21 stored after that is poured. At that time, the bottom plate 14 is heated by the heating means 26 embedded in the bottom plate 14 to suppress the temperature drop of the bottom plate 14.

本実施形態では、加熱手段２６による底版１４の加熱温度を、温度設定部２８によって環境温度（例えば２０℃）よりも低い温度（ただし、０℃よりも高い温度；例えば５℃〜１５℃程度）に設定している。このように、底版１４を環境温度よりも低い温度とすることで、底版１４を収縮させることにより、側壁１６の下部がタンク中心に向けて引き寄せられて、これによって側壁１６にプレストレスが導入される。   In this embodiment, the heating temperature of the bottom plate 14 by the heating means 26 is lower than the environmental temperature (for example, 20 ° C.) by the temperature setting unit 28 (however, higher than 0 ° C .; for example, about 5 ° C. to 15 ° C.). Is set. Thus, by making the bottom plate 14 lower than the environmental temperature, the bottom plate 14 is contracted, so that the lower portion of the side wall 16 is drawn toward the center of the tank, and thereby prestress is introduced into the side wall 16. The

図４は、ＰＣタンク１０に貯留された低温液体の内圧によって側壁１６に発生する応力、テンドン１９，２０により側壁１６に導入されるプレストレス、及び底版１４の収縮により側壁１６に導入されるプレストレスを模式的に図示したものである。同図に示すように、側壁１６の下端部は底版１４に拘束されるため、テンドン１９，２０だけでは側壁下部に十分なプレストレスを導入することは難しいが、図中に斜線を付して示すように、底版１４の収縮によるプレストレスを導入すれば、側壁１６の下部にも、液体の内圧に抵抗できるだけの十分なプレストレスを確保できるのである。換言すれば、底版１４の収縮により導入されるプレストレスによってテンドン１９，２０で導入すべきプレストレスによっての量を軽減できるので、側壁１６へのプレストレス導入作業を簡易化することができる。   FIG. 4 shows the stress generated in the side wall 16 due to the internal pressure of the cryogenic liquid stored in the PC tank 10, the prestress introduced into the side wall 16 by tendons 19 and 20, and the prestress introduced into the side wall 16 due to contraction of the bottom plate 14. The stress is schematically illustrated. As shown in the figure, since the lower end portion of the side wall 16 is restrained by the bottom plate 14, it is difficult to introduce sufficient prestress to the lower portion of the side wall with only the tendons 19 and 20, but hatched lines are added in the figure. As shown in the figure, if prestress due to contraction of the bottom plate 14 is introduced, sufficient prestress that can resist the internal pressure of the liquid can be secured also in the lower portion of the side wall 16. In other words, since the amount of prestress to be introduced by the tendons 19 and 20 can be reduced by the prestress introduced by the contraction of the bottom plate 14, the prestress introduction work to the side wall 16 can be simplified.

また、底版１４の収縮によって、底版１４には引張力が生ずるが、本実施形態では、ＰＣ鋼材３０で底版１４にプレストレスを導入することにより、底版１４にひび割れが生ずるのを防止することが可能となる。   In addition, a tensile force is generated in the bottom plate 14 due to the contraction of the bottom plate 14, but in this embodiment, by introducing prestress to the bottom plate 14 with the PC steel material 30, it is possible to prevent the bottom plate 14 from being cracked. It becomes possible.

このように、本実施形態によれば、底版１４を分割するといった手間の掛かる工事を行なうことなく、底版１４にプレストレスを導入するとともに、タンク稼動時における底版１４の温度を低めに設定することにより、底版１４にひび割れが生ずるのを防止しつつ、側壁１６の下部に十分なプレストレスを導入することができる。   As described above, according to the present embodiment, the pre-stress is introduced into the bottom plate 14 and the temperature of the bottom plate 14 when the tank is in operation is set low, without performing laborious work such as dividing the bottom plate 14. Thus, it is possible to introduce sufficient prestress to the lower part of the side wall 16 while preventing the bottom plate 14 from cracking.

また、本実施形態では、底版１４の温度を従来よりも低目に設定しているので、底版１４の加熱に必要なエネルギー量を低減できる。したがって、加熱手段２６の規模が小さくて済むため、建築費用を削減でき、また、エネルギー消費量が少なくなるため、運転費用も削減できる。   Moreover, in this embodiment, since the temperature of the bottom plate 14 is set lower than before, the amount of energy required for heating the bottom plate 14 can be reduced. Therefore, since the scale of the heating means 26 can be small, the construction cost can be reduced, and the energy consumption can be reduced, so that the operation cost can also be reduced.

また、底版１４の温度を低めに設定することにより、タンク底部より貯蔵している低温液体２１への入熱量も小さくなるので、ＰＣタンク１０の保冷性能が向上する。このため、気化ガスの発生量が少なくなって、気化ガス処理設備の容量を削減することが可能となり、また、底部の保冷材２２の厚さを薄くしたり、断熱材の性能を下げたりすることも可能となって、設備コストの削減を図ることができる。   Moreover, since the amount of heat input to the low temperature liquid 21 stored from the bottom of the tank is reduced by setting the temperature of the bottom slab 14 lower, the cold insulation performance of the PC tank 10 is improved. For this reason, the generation amount of the vaporized gas is reduced, the capacity of the vaporized gas processing facility can be reduced, the thickness of the cold insulation 22 at the bottom is reduced, and the performance of the heat insulating material is lowered. This also makes it possible to reduce the equipment cost.

なお、従来、ＰＣタンクの底版は、側壁が接続される外周部分のみを厚くして、内周部は薄くする構成が一般的であるが、本実施形態では、底版１４の厚さをほぼ一定とすることにより、底版１４の収縮による側壁１６へのプレストレス導入を効果的に行えるようにしている。   Conventionally, the bottom plate of the PC tank generally has a configuration in which only the outer peripheral portion to which the side wall is connected is thickened and the inner peripheral portion is thinned. However, in this embodiment, the thickness of the bottom plate 14 is substantially constant. Thus, prestress can be effectively introduced into the side wall 16 by contraction of the bottom plate 14.

また、底版１４を構築する際、一度に全体のコンクリートを打設することとしてもよいが、コンクリート製造設備の能力の関係等から一度に全体を打設することが難しい場合には、底版を扇形、矩形や環状等に分割して構築したうえでプレストレスを導入するようにしてもよい。その場合には、底版の面内にプレストレスを導入することにより、分割して打設したコンクリートの打継目の液密性、止水性を確保することが容易かつ確実となる。   Moreover, when constructing the bottom slab 14, the entire concrete may be cast at once. However, if it is difficult to cast the entire concrete at once because of the capacity of the concrete production equipment, the bottom slab is fan-shaped. Alternatively, pre-stress may be introduced after being constructed by being divided into rectangles or rings. In that case, by introducing prestress in the plane of the bottom plate, it becomes easy and reliable to ensure the liquid-tightness and water-tightness of the jointed concrete in the divided and placed concrete.

本発明の一実施形態に係わるＰＣタンクの正面図であり、図中左側を鉛直断面で示す。It is a front view of PC tank concerning one embodiment of the present invention, and shows the left side in the figure with a vertical section. ＰＣタンクの側壁部を拡大して示す鉛直断面図である。It is a vertical sectional view which expands and shows the side wall part of a PC tank. ＰＣタンクの底版にプレストレスを導入するための構造を示す斜視図である。It is a perspective view which shows the structure for introduce | transducing prestress to the baseplate of a PC tank. ＰＣタンクに貯留された低温液体の内圧によって側壁に作用する応力、テンドンにより側壁に導入されるプレストレス、及び底版の収縮により側壁に導入されるプレストレスを模式的に示す図である。It is a figure which shows typically the stress which acts on a side wall by the internal pressure of the cryogenic liquid stored in PC tank, the prestress introduced into a side wall by tendon, and the prestress introduced into a side wall by shrinkage | contraction of a bottom plate.

符号の説明Explanation of symbols

１０ ＰＣタンク
１２ 地盤
１４ 底版
１６ 側壁
１８ 基礎杭
１９，２０ テンドン
２１ 低温液体
２２，２４ 保冷材
２６ 加熱手段
２８ 温度設定部
３０ ＰＣ鋼材 DESCRIPTION OF SYMBOLS 10 PC tank 12 Ground 14 Bottom plate 16 Side wall 18 Foundation pile 19,20 Tendon 21 Low temperature liquid 22,24 Cold insulation material 26 Heating means 28 Temperature setting part 30 PC steel materials

Claims (3)

底版と側壁とが一体化して構成され、前記底版内に加熱手段を備えた低温物質貯蔵用の低温ＰＣタンクであって、
前記底版にプレストレスを導入するプレストレス手段と、
前記加熱手段による前記底版の加熱温度を、建設時の環境温度よりも低温に設定する温度設定手段と、を備えることを特徴とする低温ＰＣタンク。 A bottom plate and a side wall are formed integrally, and is a low-temperature PC tank for storing a low-temperature substance having heating means in the bottom plate,
Prestressing means for introducing prestress into the bottom plate,
A low-temperature PC tank comprising: temperature setting means for setting the heating temperature of the bottom slab by the heating means to be lower than the environmental temperature during construction. 前記底版は略一定の厚さを有することを特徴とする請求項１記載の低温ＰＣタンク。   2. The low-temperature PC tank according to claim 1, wherein the bottom plate has a substantially constant thickness. 底版と側壁とが一体化して構成され、前記底版内に加熱手段を備えた低温物質貯蔵用の低温ＰＣタンクを構築して運用する方法であって、前記底版を構築してプレストレスを導入し、この底版と一体に側壁を構築して該側壁にプレストレスを導入し、当該低温ＰＣタンクの完成後、前記低温物質の貯蔵時に前記加熱手段により前記底版を建設時の環境温度よりも低い温度に設定することを特徴とする低温ＰＣタンクの構築運用方法。

A method of constructing and operating a low-temperature PC tank for storing a low-temperature substance, in which a bottom plate and a side wall are integrally formed and provided with heating means in the bottom plate, wherein the bottom plate is constructed and prestress is introduced. In addition, a side wall is constructed integrally with the bottom plate, prestress is introduced into the side wall, and after the completion of the low temperature PC tank, a temperature lower than an environmental temperature at the time of construction of the bottom plate by the heating means when storing the low temperature substance. A construction and operation method of a low-temperature PC tank characterized by being set to

JP2004055885A 2004-03-01 2004-03-01 Low-temperature pc tank, and method for constructing and using the same Pending JP2005247324A (en)

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JP2013043688A (en) * 2011-08-26 2013-03-04 Ishii Iron Works Co Ltd Dike-combined normal pressure concrete tank with steel plate lining

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JP2011149510A (en) * 2010-01-22 2011-08-04 Taisei Corp Prestressed concrete structure
JP2013043688A (en) * 2011-08-26 2013-03-04 Ishii Iron Works Co Ltd Dike-combined normal pressure concrete tank with steel plate lining

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