JPS626160B2 - - Google Patents
Info
- Publication number
- JPS626160B2 JPS626160B2 JP18337680A JP18337680A JPS626160B2 JP S626160 B2 JPS626160 B2 JP S626160B2 JP 18337680 A JP18337680 A JP 18337680A JP 18337680 A JP18337680 A JP 18337680A JP S626160 B2 JPS626160 B2 JP S626160B2
- Authority
- JP
- Japan
- Prior art keywords
- underground tank
- fence
- heat
- depth
- soil
- 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
- 239000007788 liquid Substances 0.000 claims description 7
- 239000002689 soil Substances 0.000 description 23
- 238000006073 displacement reaction Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000003949 liquefied natural gas Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
Classifications
-
- 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
- F17C13/10—Arrangements for preventing freezing
-
- 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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
-
- 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
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/031—Dealing with losses due to heat transfer
- F17C2260/032—Avoiding freezing or defrosting
-
- 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
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0142—Applications for fluid transport or storage placed underground
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はLNG（液化天然ガス）のような低温
液体を貯蔵する地下タンク装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an underground tank system for storing low temperature liquids such as LNG (liquefied natural gas).
LNGのように−162℃の低温液体を貯蔵する地
下タンクの場合には、貯蔵液体の冷熱により地下
タンクの周囲に凍土層が成長し、経年的にタンク
の周囲の構築物等に悪い影響を及ぼすことから、
この凍土層の成長をある一定の範囲内において止
める工夫がなされている。
In the case of underground tanks that store low-temperature liquids such as LNG at -162°C, a frozen layer grows around the underground tank due to the cold heat of the stored liquid, which has a negative impact on structures around the tank over time. Therefore,
Efforts have been made to stop the growth of this frozen layer within a certain range.
この代表的な例としてはヒートフエンスによる
方法があり、これは第１図に示すように、地下タ
ンク０１から離れた位置であつて地下タンク０１
をとり囲むように温水等を利用した発熱体（ヒー
トフエンス）０２を地下タンク０１の深さとほぼ
同じ深さまで挿入設置し、この発熱体０２の内側
にて凍土層ａの成長を止めてこれ以上は成長させ
ないという方法である。 A typical example of this is a method using a heat fence, which is located at a location far away from the underground tank 01, as shown in Figure 1.
A heating element (heat fence) 02 that uses hot water, etc. is inserted and installed to surround the underground tank 01 to approximately the same depth as the depth of the underground tank 01, and the growth of the frozen layer a is stopped inside this heating element 02, preventing further growth. This is a method of not allowing it to grow.
上記のようなヒートフエンスによる凍土層の成
長阻止方法は確かに凍土層の成長を阻止する面で
は効果を発揮し、現在実施されているが、最近地
下タンクの周辺における地盤の変位の問題は前記
ヒートフエンスによつて凍土層の成長を阻止した
だけでは解決しないことが判明した。 The method of inhibiting the growth of frozen soil layers using heat fences as described above is certainly effective in inhibiting the growth of frozen soil layers, and is currently being implemented, but recently the problem of ground displacement around underground tanks has been addressed. It turned out that simply preventing the growth of the frozen soil layer through heat fencing was not the solution.
すなわち、地盤の変位の原因には更に、地表
面に近い部分の地盤では大気からの入熱により土
の凍結・融解現象が年周期で繰り返し行なわれ、
凍結時には周辺未凍結土から吸水して大きく凍土
化するが、融解時には周辺に水を送り返す力は弱
いので、周辺の地盤の変位は元に戻らず、凍結、
融解を繰り返すたびに周辺の地盤の変位は累積さ
れて行くという問題があり、又、地表に近い部
分では上方からの土圧が小さく且つ温度勾配も小
さくなるため、いわゆる完全凍土（土は凍らない
が、凍結面近傍に純氷の層ができてこれが成長し
て行く現象）の条件を満たしやすく、凍土の成長
は停止しても純氷の成長が続き周辺地盤の変位は
継続するという問題があり、更に、地表に近い
部分の地盤においては雨水などが浸透して水分が
多くなり凍土化現象を助長すると共に通常地下タ
ンクの盛土に使われる埋立土は凍結膨張率が他に
比較して大きく、これらの原因により地表面での
地盤変位が深層部とは別に起るということであ
る。 In other words, the cause of ground displacement is that soil near the ground surface repeatedly freezes and thaws on an annual cycle due to heat input from the atmosphere.
When it freezes, it absorbs water from the surrounding unfrozen soil and becomes frozen, but when it thaws, the power to send water back to the surrounding area is weak, so the displacement of the surrounding ground does not return to its original state, and when it freezes,
There is a problem in that the displacement of the surrounding ground accumulates each time it thaws, and in addition, in areas close to the ground surface, the earth pressure from above is small and the temperature gradient is also small. However, it is easy to satisfy the conditions for a phenomenon in which a layer of pure ice forms near the frozen surface and then grows, and even if the growth of frozen soil stops, the growth of pure ice continues and the displacement of the surrounding ground continues. In addition, in the ground near the surface, rainwater permeates and increases the moisture content, which promotes the phenomenon of frozen soil, and the frozen expansion rate of reclaimed soil, which is normally used for embankments for underground tanks, is higher than that of other soils. Due to these causes, ground displacement at the ground surface occurs separately from that at the deep layer.
したがつて、地下タンクの周辺地盤の変位問題
を解決するためには上記〜の発生原因に対し
ても有効な対策を講じることが必要となる。この
手段として先ず考えられるのは、前記の場合に
は地表面に断熱、断水材を被覆して大気温度の影
響を少なくし、雨水の侵入を防ぐことである。ま
たの場合には盛土部０３上に更に盛土を行なつ
て断熱と上方からの土圧を大きくしてやることで
ある。またの場合には水の供給を断つために地
下タンク周辺に機械的止水壁を構築したり或いは
土質を改良して不透水化土層を形成することであ
る。 Therefore, in order to solve the problem of displacement of the ground around underground tanks, it is necessary to take effective measures against the above causes. In the above case, the first possible means for this is to cover the ground surface with a heat insulating and water-blocking material to reduce the influence of atmospheric temperature and prevent rainwater from entering. In other cases, it is necessary to further fill the earth on the earth embankment part 03 to increase insulation and earth pressure from above. In other cases, it is necessary to construct a mechanical water-stop wall around the underground tank to cut off the water supply, or to improve the soil quality and form an impermeable soil layer.
しかし、これらの手段をいくら実施しても天候
の影響を完全に遮断したり、雨水や地下水の侵入
を完全に防止するということは不可能である。こ
のため、小さな凍土化土圧の影響であつても経年
的には無視できない地盤変位となつて現われる。 However, no matter how many of these measures are implemented, it is impossible to completely block out the effects of weather or completely prevent the intrusion of rainwater and groundwater. For this reason, even small effects of frozen soil pressure appear as ground displacement that cannot be ignored over time.
その他、公知例の中には土壌中の土質に応じて
凍土化を効率的に阻止する手段として、ヒートフ
エンスを土質に合わせて複数に設けたり、ヒート
フエンスの性能を変えるという提案がある（特開
昭49―815）。しかし、この公知例は、深層に設置
するものであることから、土質に関係する問題点
を解消しても天候に関係する問題点を解消するこ
とはできない。 In addition, there are proposals to install multiple heat fences or change the performance of heat fences depending on the soil quality as a means to efficiently prevent frozen soil depending on the soil quality (especially Kaisho 49-815). However, since this known example is installed in a deep layer, even if the problems related to the soil quality are solved, the problems related to the weather cannot be solved.
本発明は、天候により影響を受けるタンク周辺
であつて地表面に近い地盤の凍土化問題を解決す
るのが目的である。
The purpose of the present invention is to solve the problem of frozen soil in the ground near the ground surface around the tank, which is affected by the weather.
本発明の構成は次のとおりである。 The configuration of the present invention is as follows.
地下タンクの周囲であつて、その鉛直方向に、
地下タンクの深さとほぼ同じ深さまで挿入設置さ
れたヒートフエンスを設けて成る低温液体貯蔵用
地下タンク装置において、地下タンクと前記ヒー
トフエンス間であつて、地下タンクに接近した位
置に、地表面の温度変化の影響を受けない深さま
でサブヒートフエンスを挿入設置したことを特徴
とする低温液体貯蔵用地下タンク装置。 Around the underground tank, in the vertical direction,
In an underground tank system for storing low-temperature liquids comprising a heat fence inserted to approximately the same depth as the depth of the underground tank, there is a An underground tank device for storing low-temperature liquids, characterized by a subheat fence inserted and installed to a depth that is not affected by temperature changes.
以下実施例図に基づき本発明を詳記すると、１
は、LNG貯蔵用地下タンク、２はこの地下タン
ク１の周囲に一定の間隔で配設されたヒートフエ
ンスにして、このヒートフエンス２は地表面から
鉛直方向にタンク１の底の深さ（約50〜60ｍ）ま
で挿入されており、内部を温水が循環し、成長し
て来た凍土層ａをこの温水熱により加熱してそれ
以上の成長を阻止するものである。
The present invention will be described in detail below based on the embodiment figures.1
is an underground tank for LNG storage, and 2 is a heat fence placed around this underground tank 1 at regular intervals. It is inserted up to a depth of 50 to 60 m), and warm water circulates inside, and the growing frozen soil layer A is heated by the heat of this hot water to prevent further growth.
３は地下タンク１の周囲に形成された盛土部、
４はこの盛土部３に前記ヒートフエンス２と同じ
ように地表面から10ｍ位の深さまで挿入され、且
つ地下タンク１を取り囲ように配設されたサブヒ
ートフエンスにして、ヒートフエンス２と同じく
内部を温水が循環している。 3 is an embankment formed around the underground tank 1;
4 is a sub-heat fence that is inserted into this embankment 3 to a depth of about 10 m from the ground surface in the same way as the heat fence 2, and is arranged so as to surround the underground tank 1. Hot water circulates inside.
なお、前記サブヒートフエンス４と地下タンク
１との距離は凍土厚が薄い方が凍結膨張の影響が
少なくなるので、小さくするのが望ましいが、一
方凍土厚を例えば零にすると地下タンクの強度が
低下してしまう。したがつて、凍土厚を0.5ｍ〜
１ｍ程度は最少限作るようにするのが望ましく、
このためにはサブヒートフエンス４と地下タンク
１との距離は１ｍ〜２ｍ位離すのがよい。 The distance between the subheat fence 4 and the underground tank 1 is preferably made small because the thinner the frozen soil thickness, the less the influence of freezing expansion.However, if the frozen soil thickness is reduced to zero, for example, the strength of the underground tank will be reduced. It will drop. Therefore, the frozen soil thickness should be 0.5m~
It is desirable to make a minimum of about 1 m,
For this purpose, the distance between the subheat fence 4 and the underground tank 1 is preferably 1 m to 2 m.
次に、サブヒートフエンス４を地表面から鉛直
方向に挿入する深さは天候の影響を受けない深さ
であれば十分であり、地域にもよるが、５ｍ〜10
ｍ位となる。 Next, the depth to which the subheat fence 4 is inserted vertically from the ground surface is sufficient as long as it is not affected by the weather, and it depends on the area, but it is 5 m to 10 m.
It will be rank m.
上記のように、地下タンク１に接近し、かつ地
表面に近い周囲にサブヒートフエンス４を設置す
ると、このサブヒートフエンス４は地下タンク１
に近い周囲であつて、地表面に近い部分における
凍土の成長を第２図a′に示すようにごく限られた
範囲内にとどめてしまうことができる。 As mentioned above, when the sub-heat fence 4 is installed near the underground tank 1 and near the ground surface, this sub-heat fence 4 will be installed near the underground tank 1.
It is possible to limit the growth of frozen soil in areas near the ground surface and within a very limited range as shown in Figure 2 a'.
本発明は以上のようにヒートフエンスとは別に
更にサブヒートフエンスを設置したことにより、
次のような効果を期待することができる。
As described above, the present invention further installs a sub-heat fence in addition to the heat fence.
The following effects can be expected.
ａ 地下タンクに近い周囲であつて、地表面に近
い部分における土壌の凍結膨張による変位を抑
えることができる。a. Displacement due to freezing and expansion of soil in the area near the ground surface near the underground tank can be suppressed.
ｂ 前記ａの効果により、地下タンク周辺に設置
されているパイプラツク等の建築物に対する影
響を無くすることができる。b. Due to the effect of a above, it is possible to eliminate the influence on buildings such as pipe racks installed around the underground tank.
ｃ 地下タンク同士或いは建物を接近して建設す
ることができ、敷地の有効利用が図れる。c. Underground tanks or buildings can be constructed close to each other, making effective use of the site.
ｄ ヒートフエンスの保護を図ることもできる。d It is also possible to protect the heat fence.
第１図は従来の地下タンクの施工例を示す断面
図、第２図は本発明を実施した地下タンク装置の
断面図、第３図は第２図はおけるＡ―Ａ線断面図
である。
１……地下タンク、２……ヒートフエンス、３
……盛土部、４……サブヒートフエンス。
FIG. 1 is a sectional view showing an example of construction of a conventional underground tank, FIG. 2 is a sectional view of an underground tank device embodying the present invention, and FIG. 3 is a sectional view taken along line AA in FIG. 2. 1...Underground tank, 2...Heat fence, 3
... Embankment, 4... Subheat fence.
Claims (1)
に、地下タンクの深さとほぼ同じ深さまで挿入設
置されたヒートフエンスを設けて成る低温液体貯
蔵用地下タンク装置において、地下タンクと前記
ヒートフエンス間であつて、地下タンクに接近し
た位置に、地表面から５ｍ〜10ｍの深さまでサブ
ヒートフエンスを挿入設置したことを特徴とする
低温液体貯蔵用地下タンク装置。1. In an underground tank system for storing low temperature liquids, which is provided with a heat fence inserted vertically around an underground tank to a depth that is approximately the same as the depth of the underground tank, there is no space between the underground tank and the heat fence. An underground tank device for storing low-temperature liquids, characterized in that a subheat fence is inserted and installed at a position close to the underground tank to a depth of 5 to 10 meters from the ground surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18337680A JPS57107499A (en) | 1980-12-24 | 1980-12-24 | Method of hindrance of freezing expansional influence upon the ground surrounding a low-temperature underground tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18337680A JPS57107499A (en) | 1980-12-24 | 1980-12-24 | Method of hindrance of freezing expansional influence upon the ground surrounding a low-temperature underground tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57107499A JPS57107499A (en) | 1982-07-03 |
| JPS626160B2 true JPS626160B2 (en) | 1987-02-09 |
Family
ID=16134679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18337680A Granted JPS57107499A (en) | 1980-12-24 | 1980-12-24 | Method of hindrance of freezing expansional influence upon the ground surrounding a low-temperature underground tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57107499A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6250253A (en) * | 1985-08-28 | 1987-03-04 | Nippon Tokushu Toryo Kk | Sound insulating method for vehicle and the like |
| US10633207B2 (en) | 2015-07-24 | 2020-04-28 | Curt G. Joa, Inc. | Vacuum commutation apparatus and methods |
| US10702428B2 (en) | 2009-04-06 | 2020-07-07 | Curt G. Joa, Inc. | Methods and apparatus for application of nested zero waste ear to traveling web |
| US10751220B2 (en) | 2012-02-20 | 2020-08-25 | Curt G. Joa, Inc. | Method of forming bonds between discrete components of disposable articles |
| USRE48182E1 (en) | 2010-08-05 | 2020-09-01 | Curt G. Joa, Inc. | Apparatus and method for minimizing waste and improving quality and production in web processing operations by automatic cuff defect correction |
-
1980
- 1980-12-24 JP JP18337680A patent/JPS57107499A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6250253A (en) * | 1985-08-28 | 1987-03-04 | Nippon Tokushu Toryo Kk | Sound insulating method for vehicle and the like |
| US10702428B2 (en) | 2009-04-06 | 2020-07-07 | Curt G. Joa, Inc. | Methods and apparatus for application of nested zero waste ear to traveling web |
| USRE48182E1 (en) | 2010-08-05 | 2020-09-01 | Curt G. Joa, Inc. | Apparatus and method for minimizing waste and improving quality and production in web processing operations by automatic cuff defect correction |
| US10751220B2 (en) | 2012-02-20 | 2020-08-25 | Curt G. Joa, Inc. | Method of forming bonds between discrete components of disposable articles |
| US10633207B2 (en) | 2015-07-24 | 2020-04-28 | Curt G. Joa, Inc. | Vacuum commutation apparatus and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57107499A (en) | 1982-07-03 |
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