JP2019105050A - Aboveground tank and construction method for aboveground tank - Google Patents

Aboveground tank and construction method for aboveground tank Download PDF

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JP2019105050A
JP2019105050A JP2017236920A JP2017236920A JP2019105050A JP 2019105050 A JP2019105050 A JP 2019105050A JP 2017236920 A JP2017236920 A JP 2017236920A JP 2017236920 A JP2017236920 A JP 2017236920A JP 2019105050 A JP2019105050 A JP 2019105050A
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tank
side wall
circumferential direction
bottom plate
slit
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JP6951961B2 (en
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安永 正道
Masamichi Yasunaga
正道 安永
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Kajima Corp
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Abstract

To provide an aboveground tank and the like capable of easily being constructed while reducing an amount of tension member in a circumferential direction of the tank.SOLUTION: An LNG tank has a tank body including a bottom slab 5 and an oil protective barrier 2. A gap between the bottom of the oil protective barrier 2 and bottom slab 5 is filled with filler, and tension in a circumferential direction of the tank is introduced into the oil protective barrier 2. On the bottom of the oil protective barrier 2, overhanging portions 2a and 2c extending laterally from the oil protective barrier 2 are formed extending in the circumferential direction of the tank. The overhang portions 2a and 2c are divided by slits 20 and 25 in the circumferential direction of the tank. On an outer periphery of the bottom slab 5, a step portion is formed where a position of an upper surface is lowered in a step, and the bottom of the oil protective barrier 2 is disposed on the step.SELECTED DRAWING: Figure 2

Description

本発明は、地上タンクおよびその構築方法に関する。   The present invention relates to a ground tank and a method of constructing the same.

LNG(液化天然ガス)、LPG(液化石油ガス)などの低温の液体を貯留する設備として、地上タンクが用いられることがある。   A ground tank may be used as a facility for storing low temperature liquids such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas).

図11は、地上タンクとしてLNGを貯留するLNGタンク100の例を示したものである。LNGタンク100は、地盤7中の杭4で支持された底版5上に防液堤6を固定してタンク躯体とし、その内側に鋼板等による内槽3aと外槽鋼板3bを設けたものである。LNGは内槽3aにて貯留し、内槽3aと外槽鋼板3bの間に断熱材8を配置して保冷を行う。外槽鋼板3bは防液堤6と一体的に形成される。底版5内には補強鉄筋やヒータ管(不図示)なども設けられる。   FIG. 11 shows an example of an LNG tank 100 storing LNG as a ground tank. In the LNG tank 100, the liquid barrier 6 is fixed on the bottom plate 5 supported by the pile 4 in the ground 7 to form a tank body, and the inner tank 3a and the outer tank steel plate 3b of steel plates etc. is there. LNG is stored in the inner tank 3a, and the heat insulating material 8 is disposed between the inner tank 3a and the outer tank steel plate 3b to perform cold storage. The outer tank steel plate 3 b is integrally formed with the liquid barrier 6. In the bottom plate 5, reinforcing reinforcing bars, a heater pipe (not shown), etc. are also provided.

防液堤6は、内槽3aが破損した場合にLNGの外部への液漏れを防ぐために設けられるコンクリート製の側壁であり、通常円筒状である。防液堤6はLNGの液圧に耐え得る構造とする必要があり、そのため底版5に剛結合され、また図示しないタンク周方向(以下、単に周方向ということがある)の緊張材や縦方向の緊張材による緊張力(プレストレス)を導入してコンクリートに所定の圧縮応力を生じさせる。   The liquid barrier 6 is a concrete side wall provided to prevent liquid leakage to the outside of the LNG when the inner tank 3a is broken, and is generally cylindrical. The liquid barrier 6 needs to have a structure that can withstand the liquid pressure of LNG, so it is rigidly connected to the bottom plate 5 and also tendons and longitudinal directions in the tank circumferential direction (hereinafter may be simply referred to as circumferential direction). Introduce tension (pre-stress) by the tendon to generate a predetermined compressive stress in the concrete.

底版5上に剛結した防液堤6で周方向の緊張材の緊張を行うと、防液堤6をタンク内側に曲げようとする鉛直面内の曲げモーメント(防液堤外側引張の曲げモーメント)が防液堤6の底部に生じることから、防液堤6ではこれを打ち消すために必要な量の縦方向の緊張材も配置する必要がある。   When tensioning the tendon in the circumferential direction with the liquid barrier 6 rigidly attached on the bottom plate 5, bending moment in the vertical plane to bend the liquid barrier 6 to the inside of the tank Since it occurs at the bottom of the liquid barrier 6, it is necessary to arrange the longitudinal tendons of the amount necessary for counteracting this.

一方、地上タンクの構築方法の一つとして、防液堤の底部がフリーの状態で周方向の緊張材を緊張した後、防液堤と底版を剛結合する方法が有る。防液堤と底版を剛結合した後に周方向の緊張材を緊張すると防液堤への周方向の緊張力の導入が底版により阻害され、また前記した鉛直面内の曲げモーメントが発生するが、上記の方法ではそのようなことが無いので周方向の緊張材の量を低減でき、前記した縦方向の緊張材の量も低減できる。   On the other hand, there is a method of rigidly connecting the liquid levee and the bottom plate after the tension in the circumferential direction is tensioned while the bottom of the liquid barrier is free as one of the methods for constructing the above ground tank. If the tension in the circumferential direction is tensioned after the liquid levee and the bottom plate are rigidly connected, the introduction of the circumferential tension to the dike is hindered by the bottom plate, and the bending moment in the vertical plane described above is generated. In the above method, since there is no such case, the amount of tendon in the circumferential direction can be reduced, and the amount of tendon in the longitudinal direction can also be reduced.

例えば特許文献1では、底版を外周部と中央部に分けて構築し、その間に隙間を空けておく。底版の外周部は基礎杭に載っているだけの状態とし、その外周部と一体に防液堤を構築し、防液堤がほぼ完成した状態で周方向の緊張材を緊張する。その後、底版の外周部と中央部の隙間に間詰めコンクリートを充填し、底版の径方向の緊張材を緊張して底版の外周部を中央部側に引きつけ、底版の外周部と基礎杭を一体化する。   For example, in Patent Document 1, the bottom plate is divided into an outer peripheral portion and a central portion, and a gap is formed therebetween. The outer periphery of the bottom plate is placed on the foundation pile only, and a liquid barrier is constructed integrally with the outer periphery, and the tension tendon in the circumferential direction is tensioned while the liquid barrier is almost completed. Thereafter, concrete is filled in the gap between the outer peripheral portion and the central portion of the bottom plate, the radial tension material of the lower plate is tensioned, the outer peripheral portion of the lower plate is attracted to the central portion side, and the outer periphery of the lower plate and the foundation pile are integrated. Turn

特開2014-167244号公報JP, 2014-167244, A

特許文献1の方法では、防液堤と一体化された底版の外周部が厚い円環状となっていることから剛性が大きい。そのため、周方向の緊張力の導入に必要な緊張材の量が増加し、周方向の緊張材を防液堤だけでなく底版の外周部にも配置することが必要となる。   In the method of Patent Document 1, the rigidity is large because the outer peripheral portion of the bottom plate integrated with the liquid protection dike has a thick annular shape. Therefore, the amount of tendon necessary for introducing tension in the circumferential direction is increased, and it is necessary to arrange the tendon in the circumferential direction not only on the liquid barrier but also on the outer periphery of the bottom plate.

また、特許文献1の方法では、基礎杭上にフリーの状態で載せられた底版の外周部に防液堤が構築された不安定な状態が長く続くことになり、最終的に底版の外周部を基礎杭に固定する作業もかなり難しい。さらに、底版の外周部を中央部に一体化するためのタンク径方向の緊張材も必要となり、底版の外周部と中央部の間で鉄筋やヒータ管を接続する必要も生じる。   Further, in the method of Patent Document 1, the unstable state in which the liquid barrier is constructed on the outer peripheral portion of the bottom plate placed free on the foundation pile continues for a long time, and finally the outer peripheral portion of the bottom plate The task of fixing the foundation to the foundation pile is also quite difficult. In addition, a tendon in the tank radial direction for integrating the outer peripheral portion of the bottom plate in the central portion is also required, and it is also necessary to connect reinforcing bars and heater pipes between the outer peripheral portion and the central portion of the lower plate.

本発明は上記の問題に鑑みてなされたものであり、タンク周方向の緊張材の量を低減でき、施工も容易な地上タンク等を提供することを目的とする。   The present invention has been made in view of the above problems, and it is an object of the present invention to provide a ground tank or the like which can reduce the amount of tendon in the circumferential direction of the tank and can be easily installed.

前述した課題を解決するための第1の発明は、底版と側壁を含むタンク躯体を有し、前記側壁の底部は前記底版から隙間を空けて形成され、前記隙間が埋められており、前記側壁にタンク周方向の緊張力が導入され、前記側壁の底部に、前記側壁から側方に張出した張出部がタンク周方向に延設され、前記張出部が、スリットによってタンク周方向に分割されたことを特徴とする地上タンクである。   A first invention for solving the above-mentioned problems has a tank body including a bottom plate and a side wall, and a bottom portion of the side wall is formed with a gap from the bottom plate and the gap is filled. A tension in the circumferential direction of the tank is introduced, and an overhanging portion projecting laterally from the side wall is extended in the circumferential direction of the tank at the bottom of the side wall, and the overhanging portion is divided in the circumferential direction of the tank by a slit It is a ground tank characterized by having been

本発明では、上記の張出部を底部に有する側壁を底版上に配置する形となるので側壁の構築が安定し、底版も杭上に最初から固定しておけばよい。さらに本発明では底版を内外に分割するわけではないので前記したタンク径方向の緊張材が不要であり、鉄筋やヒータ管などの接続作業も不要である。また、張出部に上記のスリットを設けることで側壁の底部の剛性は小さくなり、タンク周方向の緊張材の緊張力は側壁の張出部を除く部分で受けることになる。また本発明ではタンク周方向の緊張力が底版に作用することもない。結果、タンク周方向の緊張材の量を減らすことができ、前記した底版の外周部内に配置されるような周方向の緊張材も不要である。   In the present invention, since the side wall having the above-mentioned overhanging portion at the bottom is disposed on the bottom plate, the construction of the side wall is stabilized, and the bottom plate may be fixed from the beginning on the pile. Further, in the present invention, since the bottom plate is not divided into the inside and the outside, the above-mentioned tendon in the radial direction of the tank is unnecessary, and the connecting operation of the reinforcing bar and the heater pipe is also unnecessary. Further, the rigidity of the bottom of the side wall is reduced by providing the slit in the overhang portion, and the tension of the tendon in the circumferential direction of the tank is received at the portion excluding the overhang portion of the side wall. Further, in the present invention, tension in the circumferential direction of the tank does not act on the bottom plate. As a result, the amount of tendon in the circumferential direction of the tank can be reduced, and there is no need for the circumferential tendon to be disposed within the outer periphery of the bottom plate.

前記底版の外周部に、上面の位置が段状に下がった段部が形成され、前記側壁の底部は、前記段部に配置されることが望ましい。
張出部を有する側壁の底部を上記の段部に配置することで、タンク躯体の全体形状を従来形状に収めることができ、構造面や施工面で合理的になる。
It is desirable that a step in which the position of the upper surface is lowered stepwise is formed on the outer peripheral portion of the bottom plate, and the bottom of the side wall is disposed on the step.
By disposing the bottom portion of the side wall having the overhang portion in the above-described step portion, the entire shape of the tank housing can be accommodated in the conventional shape, which is rational in terms of structure and construction.

前記張出部は、前記側壁の内側と外側に張出し、前記内側と外側に張出した張出部の両方が、スリットによってタンク周方向に分割されることが望ましい。
これにより施工時の側壁の安定性を高めることができ、且つ上記のスリットを設けることで周方向の緊張材の量も抑制できる。
It is preferable that the overhanging portion overhangs inward and outward of the side wall, and both the inward and outward overhanging overhanging portions are divided in the tank circumferential direction by a slit.
Thereby, the stability of the side wall at the time of construction can be enhanced, and the amount of tendon in the circumferential direction can be suppressed by providing the above-mentioned slits.

前記張出部は、前記側壁の外側に張出し、前記外側に張出した張出部は、前記側壁のハンチ部を含むことが望ましい。
この場合、ハンチ部により側壁の補強を行うことができ、且つ上記のスリットを設けることで周方向の緊張材の量も抑制できる。
It is preferable that the overhanging portion overhangs to the outside of the side wall, and the overhanging portion that overhangs to the outside includes a hunt portion of the side wall.
In this case, the side wall can be reinforced by the hunt portion, and the amount of the tendon in the circumferential direction can be suppressed by providing the above-mentioned slits.

また、前記張出部は、前記側壁の外側に張出し、前記外側に張出した張出部の前記スリットにスリット材が配置されることが望ましい。
本発明では、コンクリート打設時にスリット材によりスリットを好適に形成することができ、またコンクリート打設後にはスリット材によってスリットを確保できる。
Further, it is preferable that the overhanging portion overhangs to the outside of the side wall, and a slit material is disposed in the slit of the overhanging portion that overhangs to the outside.
In the present invention, the slit can be suitably formed by the slit material at the time of concrete placement, and the slit can be secured by the slit material after the concrete placement.

第2の発明は、底版と側壁を含むタンク躯体を有する地上タンクの構築方法であって、前記底版の上に側壁を形成する工程と、前記側壁にタンク周方向の緊張力を導入する工程と、を有し、前記側壁の底部は前記底版から隙間を空けて形成され、前記隙間は前記側壁にタンク周方向の緊張力を導入した後に埋められ、前記側壁の底部に、前記側壁から側方に張出した張出部がタンク周方向に延設され、前記張出部が、スリットによってタンク周方向に分割されたことを特徴とする地上タンクの構築方法である。   A second invention is a method of constructing a ground tank having a tank body including a bottom plate and a side wall, the steps of forming a side wall on the bottom plate, and introducing tension in the circumferential direction of the tank to the side wall And the bottom of the side wall is formed with a gap from the bottom plate, and the gap is filled after introducing tension in the circumferential direction of the tank to the side wall, and the bottom of the side wall is laterally spaced from the side wall A method of constructing a ground tank according to the present invention is characterized in that an overhanging portion is extended in the circumferential direction of the tank, and the overhanging portion is divided in the circumferential direction of the tank by a slit.

本発明により、タンク周方向の緊張材の量を低減でき、施工も容易な地上タンク等を提供することができる。   According to the present invention, it is possible to provide a ground tank or the like which can reduce the amount of tendon in the circumferential direction of the tank and can be easily installed.

LNGタンク1を示す図。The figure which shows the LNG tank 1. FIG. 防液堤2を示す図。FIG. 防液堤2の底部の厚さ方向の断面を示す図。The figure which shows the cross section of the thickness direction of the bottom part of the liquid barrier 2. As shown in FIG. シーリング材24を示す図。The figure which shows the sealing material 24. FIG. H形鋼31とヘッドバー筋33を示す図。The figure which shows the H-shaped steel 31 and the head bar streak 33. FIG. LNGタンク1の構築方法を示す図。The figure which shows the construction method of the LNG tank 1. FIG. フープ筋35を示す図。FIG. アンカーボルト37a、37bを示す図。The figure which shows anchor bolt 37a, 37b. ハンチ部21aを示す図。The figure which shows the hunting part 21a. 防液堤2’、2”を示す図。The figure which shows a liquid barrier 2 ', 2' '. LNGタンク100を示す図。The figure which shows the LNG tank 100. FIG.

以下、図面に基づいて本発明の好適な実施形態について詳細に説明する。   Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

(1.LNGタンク1)
図1は本発明の実施形態に係る地上タンクであるLNGタンク1を示す図である。
(1. LNG tank 1)
FIG. 1 is a view showing an LNG tank 1 which is a ground tank according to an embodiment of the present invention.

LNGタンク1は、内部にLNG(低温液体)を貯留する20万KL程度の大きさの地上タンクであり、図11で説明したLNGタンク100と同様、地盤7中の杭4で支持された底版5上に防液堤2を固定してタンク躯体とし、その内側に内槽3aと外槽鋼板3bを設けたものである。防液堤2は底版5に剛結合された円筒状の側壁であり、内槽3aが破損した場合にLNGの外部への液漏れを防ぐため設けられる。防液堤2は所定の引張強度を有するコンクリートによって構築され、タンク躯体の内径は80m程度、高さは40m程度になる。   The LNG tank 1 is a ground tank with a size of about 200,000 KL for storing LNG (low temperature liquid) inside, and is a bottom plate supported by the pile 4 in the ground 7 like the LNG tank 100 described in FIG. The liquid barrier 2 is fixed on 5 to form a tank body, and the inner tank 3a and the outer tank steel plate 3b are provided inside thereof. The liquid barrier 2 is a cylindrical side wall rigidly coupled to the bottom plate 5 and is provided to prevent liquid leakage to the outside of the LNG when the inner tank 3a is broken. The liquid barrier 2 is constructed of concrete having a predetermined tensile strength, and the inner diameter of the tank body is about 80 m and the height is about 40 m.

LNGタンク1はPC(プレストレストコンクリート)タンクであり、防液堤2には後述するようにタンク周方向の緊張材および縦方向の緊張材による緊張力が導入される。   The LNG tank 1 is a PC (prestressed concrete) tank, and tension by the tendon in the circumferential direction of the tank and the tendon in the longitudinal direction are introduced to the liquid protection dike 2 as described later.

防液堤2の底部には、防液堤2の側方に張出した張出部2a、2cが設けられる。張出部2aは防液堤2の外側に張出しており、ハンチ部21と板状部22を有する。   At the bottom of the liquid protection dike 2, overhang portions 2a and 2c are provided, which are extended to the side of the liquid protection dike 2. As shown in FIG. The overhanging portion 2 a is overhanging to the outside of the liquid barrier 2 and has a hunting portion 21 and a plate-like portion 22.

ハンチ部21は、その上方の厚さ一定(例えば0.6m程度)の等厚部2bに対して外側に拡幅した直角三角形状の断面部分である。ハンチ部21の外面は、下方へ行くにつれて外側に向かうように鉛直方向に対して直線状に傾斜し、ハンチ部21の下端において、ハンチ部21を含む防液堤2の厚さは1.2m程度となる。ここで、「外」とはタンク外部側をいうものとし、「内」とはタンク内部側をいうものとする。ハンチ部21を設ける高さ範囲は設計により異なるが、例えば板状部22からのハンチ部21の高さを5.0m程度とする。   The hunting portion 21 is a right-triangular cross-sectional portion that is widened outward with respect to the constant thickness portion 2 b having a constant thickness (for example, about 0.6 m) above the same. The outer surface of the hunting portion 21 is inclined linearly with respect to the vertical direction so as to go outward as it goes downward, and at the lower end of the hunting portion 21, the thickness of the liquid protection dike 2 including the hunting portion 21 is about 1.2 m It becomes. Here, "outside" refers to the outside of the tank, and "inside" refers to the inside of the tank. Although the height range which provides the hunt part 21 changes with design, for example, the height of the hunt part 21 from the plate-like part 22 shall be about 5.0 m.

板状部22は、ハンチ部21の下方に形成される。板状部22の外面は鉛直方向に沿って形成されており、図1の例では当該外面の平面位置がハンチ部21の下端と略同じであるが、それより外側に突出してもよい。   The plate-like portion 22 is formed below the hunting portion 21. The outer surface of the plate-like portion 22 is formed along the vertical direction, and the planar position of the outer surface is substantially the same as the lower end of the hunting portion 21 in the example of FIG.

張出部2cは防液堤2の内側に板状に張出した部分であり、張出部2cの上面の高さは前記した板状部22の上端の高さに略等しい。張出部2cの底面の高さも板状部22の底面の高さに略等しく、この張出部2cと板状部22を含む防液堤2の底端部は、防液堤2を支持する支持板部分を構成している。   The overhanging portion 2 c is a plate-like overhanging portion inside the liquid-proof dike 2, and the height of the upper surface of the overhanging portion 2 c is substantially equal to the height of the upper end of the plate-like portion 22 described above. The height of the bottom of the overhang 2c is also substantially equal to the height of the bottom of the plate 22 and the bottom end of the liquid dike 2 including the overhang 2c and the plate 22 supports the liquid dike 2. Support plate portion.

張出部2cおよび板状部22の高さは0.6m程度であり、張出部2cと板状部22を含む防液堤2の底面のタンク径方向の長さは例えば3.0m程度とする。タンク径方向は図1の左右方向に対応する。   The height of the overhanging portion 2c and the plate-like portion 22 is about 0.6 m, and the length in the tank radial direction of the bottom surface of the liquid-proof dike 2 including the overhanging portion 2c and the plate-like portion 22 is, for example, about 3.0 m . The tank radial direction corresponds to the left and right direction in FIG.

図2(a)は防液堤2を外側から見たものである。図2(a)に示すように、張出部2aは防液堤2の外面でタンク周方向に沿って延設される。ただし、張出部2aにはタンク周方向に所定間隔でスリット20が設けられ、張出部2aがスリット20によってタンク周方向に分割される。スリット20はハンチ部21と板状部22の間で連続するように設けられ、上記の間隔は例えば2.5mとしてハンチ部21と板状部22を合わせた高さ以下とする。   FIG. 2 (a) is a view of the liquid dike 2 viewed from the outside. As shown in FIG. 2A, the overhanging portion 2 a is extended along the circumferential direction of the tank on the outer surface of the liquid protection dike 2. However, slits 20 are provided in the overhang portion 2 a at predetermined intervals in the tank circumferential direction, and the overhang portions 2 a are divided by the slits 20 in the tank circumferential direction. The slit 20 is provided so as to be continuous between the hunting portion 21 and the plate-like portion 22, and the above-mentioned interval is, for example, 2.5 m, equal to or less than the combined height of the hunting-portion 21 and the plate-like portion 22.

図2(b)は防液堤2の内部の一部を示す図である。本実施形態では張出部2cにもタンク周方向に所定間隔でスリット25が設けられており、張出部2cがスリット25によってタンク周方向に分割される。スリット25のタンク周方向の位置は、上記したスリット20のタンク周方向の位置に対応している。ただし、スリット20、25のタンク周方向の位置が異なっていてもよい。   FIG. 2 (b) is a view showing a part of the inside of the liquid dike 2. In the present embodiment, slits 25 are also provided in the overhang portion 2 c at predetermined intervals in the tank circumferential direction, and the overhang portion 2 c is divided by the slits 25 in the tank circumferential direction. The position in the tank circumferential direction of the slit 25 corresponds to the position in the tank circumferential direction of the slit 20 described above. However, the positions of the slits 20 and 25 in the tank circumferential direction may be different.

これらのスリット20、25は張出部2a、2cのみで設けられ、防液堤2の本体部分(張出部2a、2cを除く部分)にはスリットが設けられない。スリット20、25は鉛直方向に設けられ、防液堤2の外面または内面と底版5の上面に対して直交する。スリット20、25の幅は上記したスリット20、25の設置間隔より小さく、例えば20mm程度とする。   These slits 20, 25 are provided only by the overhanging portions 2a, 2c, and no slit is provided in the main body portion (portion excluding the overhanging portions 2a, 2c) of the liquid-proof dike 2. The slits 20, 25 are provided in the vertical direction, and are orthogonal to the outer surface or the inner surface of the liquid break embankment 2 and the upper surface of the bottom plate 5. The width of the slits 20, 25 is smaller than the installation interval of the slits 20, 25 described above, for example, about 20 mm.

図3(a)、(b)は防液堤2の底部の厚さ方向の断面を示す図であり、図3(a)はスリット20、25の無い位置(スリット20、25とスリット20、25の間)での断面、図3(b)はスリット20、25の位置での断面を示す。   3 (a) and 3 (b) show cross sections in the thickness direction of the bottom of the liquid-proof dike 2, and FIG. 3 (a) shows positions without slits 20 and 25 (slits 20 and 25 and slit 20, FIG. 3 (b) shows the cross section at the position of the slits 20, 25).

図に示すように、底版5の外周部には、上面の位置が段状に下がった段部51が形成される。防液堤2の底部は底版5とは分離し別体として形成されており、当該底部はこの段部51に配置される。   As shown in the drawing, on the outer peripheral portion of the bottom plate 5, a stepped portion 51 in which the position of the upper surface is lowered stepwise is formed. The bottom of the liquid barrier 2 is formed separately from the bottom plate 5, and the bottom is disposed on the step 51.

段部51の段差は0.7m程度、タンク径方向の長さは3.1m程度であり、防液堤2の底部と段部51の間には隙間が形成される。すなわち、防液堤2の底面と段部51の上面の間、防液堤2の底部の張出部2cの内周面と段部51の壁面の間にはそれぞれ0.1m程度の隙間がある。この隙間にはモルタル等の充填材30が充填され、これにより隙間が埋められる。また、段部51の内側部分の底版5の上面と、張出部2cの上面とは同じ高さにある。   The step of the step 51 is about 0.7 m, and the length in the tank radial direction is about 3.1 m, and a gap is formed between the bottom of the liquid dike 2 and the step 51. That is, there is a space of about 0.1 m between the bottom surface of the liquid barrier 2 and the upper surface of the step 51, and the inner circumferential surface of the overhang 2c at the bottom of the liquid barrier 2 and the wall surface of the step 51 . This space is filled with a filler 30 such as mortar, thereby filling the space. Further, the upper surface of the bottom plate 5 in the inner portion of the step 51 and the upper surface of the overhang 2c are at the same height.

防液堤2内には、タンク周方向の緊張材である周方向PC鋼材11と、縦方向の緊張材である縦方向PC鋼材13が設けられる。   In the liquid protection dike 2, a circumferential PC steel 11 which is a tendon in the circumferential direction of the tank and a longitudinal PC steel 13 which is a tendon in the longitudinal direction are provided.

周方向PC鋼材11は上下に間隔を空けて複数設けられ、防液堤2の底部から頂部までほぼ全高さに渡って配置される。周方向PC鋼材11は縦方向PC鋼材13に沿うように配置される。   A plurality of circumferential PC steel members 11 are provided at intervals in the upper and lower direction, and are disposed over substantially the entire height from the bottom to the top of the liquid-proof dike 2. The circumferential PC steel 11 is disposed along the longitudinal PC steel 13.

縦方向PC鋼材13は周方向PC鋼材11の内側で鉛直方向に設けられる。縦方向PC鋼材13は防液堤2の頂部から底版5に至るまで配置され、等厚部2bの厚さ方向のほぼ中央に当たる位置に配置される。   The longitudinal PC steel 13 is provided in the vertical direction inside the circumferential PC steel 11. The longitudinal PC steel 13 is disposed from the top to the bottom plate 5 of the liquid-proof dike 2 and is disposed at a position substantially at the center of the equal thickness portion 2b in the thickness direction.

これらのPC鋼材の量、配置、緊張力は設計によって決められる。また各PC鋼材は防液堤2や底版5のコンクリートに埋設されたシース(不図示)内に配置されており、緊張を行った後にシースとPC鋼材の間にモルタルが充填される。なお、張出部2a、2cには補強のためタンク周方向の鉄筋(不図示)も埋設されるが、この鉄筋はスリット20、25を貫通しないものとなっている。ただし、内側の張出部2cについては、タンク周方向の鉄筋がスリット25を貫通してもよい。   The amount, placement and tension of these PC steels are determined by design. In addition, each PC steel material is disposed in a sheath (not shown) embedded in the concrete of the liquid protection dike 2 and the bottom plate 5, and after tensioning, mortar is filled between the sheath and the PC steel material. Although reinforcements (not shown) in the circumferential direction of the tank are also embedded in the overhang portions 2a and 2c for reinforcement, the reinforcements do not penetrate the slits 20 and 25. However, the reinforcing member in the tank circumferential direction may penetrate the slit 25 for the inner overhanging portion 2 c.

張出部2aのスリット20には板状のスリット材23が配置され、スリット20がスリット材23で埋められる。スリット材23の材質は特に限定されないが、合板等の木板の他、硬質ゴム板、ポリウレタンフォーム、発泡スチロールなどの弾性体を用いることができる。一方、張出部2cのスリット25は前記の充填材30で充填される。   A plate-like slit material 23 is disposed in the slit 20 of the overhang portion 2 a, and the slit 20 is filled with the slit material 23. The material of the slit member 23 is not particularly limited, but in addition to a wood board such as plywood, an elastic body such as a hard rubber plate, a polyurethane foam, and a polystyrene foam can be used. On the other hand, the slit 25 of the overhang portion 2 c is filled with the filler 30 described above.

スリット20の位置にスリット材23を予め配置するとともに、スリット25の位置にスリット材23と同様のスリット材を予め配置した状態で防液堤2の底部のコンクリートを打設することで、スリット20、25を好適に形成することができる。これらのスリット材は防液堤2の底部のコンクリートの打設時の埋設型枠(不図示)に取付けて配置することも可能である。   The slit 20 is disposed at the position of the slit 20 in advance, and the concrete of the bottom of the liquid barrier 2 is cast in a state where the slit similar to the slit 23 is disposed at the position of the slit 25 in advance. , 25 can be suitably formed. It is also possible to attach and arrange these slit members on a buried form frame (not shown) at the time of pouring concrete on the bottom of the liquid barrier 2.

スリット20の位置に配置したスリット材23についてはそのまま残置しておくことで、コンクリート打設後にスリット材23によってスリット20を確保できる。一方、スリット25の位置に配置したスリット材はコンクリートの打設後に撤去する。   By leaving the slit material 23 disposed at the position of the slit 20 as it is, the slit 20 can be secured by the slit material 23 after concrete placement. On the other hand, the slit material disposed at the position of the slit 25 is removed after placing the concrete.

図4は図3(b)の線A−Aによる断面を示す図である。図4に示すように、スリット20の外側の開口端ではスリット材23の外側にシーリング材24が設けられ、スリット20(スリット材23)が外界から保護される。この開口端では、シーリング材24の設置に際し張出部2aのコンクリートが面取りされて面取部28が形成される。   FIG. 4 is a view showing a cross section taken along line A-A of FIG. As shown in FIG. 4, at the open end outside the slit 20, a sealing material 24 is provided on the outside of the slit material 23, and the slit 20 (slit material 23) is protected from the outside. At the opening end, the concrete of the overhang portion 2 a is chamfered when the sealing material 24 is installed, and the chamfered portion 28 is formed.

図5(a)は、防液堤2の底部と底版5の段部51の間の隙間を充填材30とPC鋼材を省略して示す図である。図5(b)は図5(a)の矢印aに示す方向から隙間を見た図であり、図5(c)は図5(a)の矢印bに示す方向から隙間を見た図である。   FIG. 5 (a) is a view showing a gap between the bottom of the liquid barrier 2 and the step 51 of the bottom plate 5, with the filler 30 and the PC steel material omitted. 5 (b) is a view from the direction shown by arrow a in FIG. 5 (a), and FIG. 5 (c) is a view from the direction shown by arrow b in FIG. 5 (a) is there.

本実施形態では、防液堤2の底面と段部51の上面の間に、タンク径方向(図5(a)の左右方向に対応する)のH形鋼31がタンク周方向(図5(c)の左右方向に対応する)に間隔を空けて複数設けられている。このH形鋼31は、施工時に防液堤2を移動可能に支持する受材としての機能を有する。   In the present embodiment, the H-shaped steel 31 in the tank radial direction (corresponding to the left and right direction in FIG. 5A) is provided between the bottom surface of the liquid protection dike 2 and the upper surface of the step 51 in the tank circumferential direction (FIG. (c) corresponds to the left and right direction of the c). The H-shaped steel 31 has a function as a receiving material for movably supporting the liquid protection dike 2 at the time of construction.

防液堤2の底面と段部51の上面、張出部2cの内周面と段部51の壁面の間では、防液堤2の底部および底版5の双方からヘッドバー筋33(鉄筋)が突出している。底版5から突出するヘッドバー筋33の先端は、防液堤2の底部から突出するヘッドバー筋33の先端よりも防液堤2側に配置される。これらのヘッドバー筋33はH形鋼31と干渉しないように配置される。   Between the bottom surface of the liquid barrier 2 and the upper surface of the step 51, and the inner circumferential surface of the overhang 2c and the wall surface of the step 51, the head bar bar 33 (rebars) from both the bottom of the liquid barrier 2 and the bottom plate 5. Is protruding. The tips of the head bar ridges 33 protruding from the bottom plate 5 are disposed closer to the liquid jet 2 than the tips of the head bar ridges 33 protruding from the bottom of the liquid barrier 2. These head bar bars 33 are arranged so as not to interfere with the H-shaped steel 31.

LNGタンク1を構築する際は、段部51を有する底版5を構築した後、図6(a)に示すように段部51の上面にH形鋼31を配置してその上に防液堤2を一部の高さ(例えば10m以上の高さ)あるいは全高さ形成する。   When constructing the LNG tank 1, after constructing the bottom plate 5 having the step 51, the H-shaped steel 31 is disposed on the upper surface of the step 51 as shown in FIG. Form 2 part height (for example, height of 10 m or more) or full height.

その後、周方向PC鋼材11による緊張力を導入することで、防液堤2は矢印Bに示すようにH形鋼31上を若干(1.0〜2.5cm程度)内側に移動する。この後、防液堤2の底部と段部51の間の隙間に図6(b)に示すように充填材30を充填する。   Thereafter, by introducing tension by the circumferential PC steel 11, the liquid barrier 2 moves slightly (about 1.0 to 2.5 cm) on the H-shaped steel 31 as shown by the arrow B. After that, the filler 30 is filled in the gap between the bottom of the liquid protection embankment 2 and the step 51 as shown in FIG. 6 (b).

本実施形態では充填材30とこれに埋設されたヘッドバー筋33により、鉄筋等を接続することなく防液堤2と底版5が剛結合され、最後に縦方向PC鋼材13による緊張力が防液堤2に導入される。以下、内槽3aや外槽鋼板3b等の取付工事を行うことでLNGタンク1が構築される。   In the present embodiment, the liquid barrier 2 and the bottom plate 5 are rigidly connected by the filler 30 and the head bar bars 33 embedded in the filler 30 without connecting reinforcing bars etc. Finally, the tension by the longitudinal PC steel 13 is prevented It is introduced to the liquid bank 2. Hereinafter, the LNG tank 1 is constructed by performing installation work of the inner tank 3a, the outer tank steel plate 3b, and the like.

以上に説明した本実施形態では、前記の張出部2a、2cを底部に有する防液堤2を底版5上に配置する形となるので防液堤2の構築が安定し、底版5も杭4上に最初から固定しておけばよい。さらに本実施形態では底版5を内外に分割するわけではないので前記したタンク径方向の緊張材が不要であり、鉄筋やヒータ管などの接続作業も不要である。   In the embodiment described above, since the liquid dike 2 having the above-mentioned overhangs 2a and 2c at the bottom is disposed on the bottom plate 5, the construction of the liquid dike 2 is stabilized, and the bottom plate 5 is also a pile. Fix it from the beginning on 4th. Further, in the present embodiment, since the bottom plate 5 is not divided into the inside and the outside, the above-described tendon in the radial direction of the tank is unnecessary, and the connecting operation of the reinforcing bar and the heater pipe is also unnecessary.

張出部2a、2cには前記のスリット20、25を設けることで剛性が小さくなり、タンク周方向の緊張力は防液堤2の張出部2a、2cを除く部分で受けることになる。また本実施形態ではタンク周方向の緊張力が底版5に作用することもない。結果、周方向PC鋼材11の量を減らすことができ、前記した底版の外周部内に配置されるような周方向の緊張材も不要である。   The rigidity is reduced by providing the slits 20 and 25 in the overhang portions 2a and 2c, and the tension force in the circumferential direction of the tank is received at the portion of the liquid dike 2 excluding the overhang portions 2a and 2c. Further, in the present embodiment, tension in the circumferential direction of the tank does not act on the bottom plate 5. As a result, the amount of the circumferential PC steel 11 can be reduced, and a circumferential tension member which is disposed within the outer periphery of the bottom plate is not necessary.

また、本実施形態では張出部2a、2cを有する防液堤2の底部を底版5の段部51に配置することで、タンク躯体の全体形状を従来形状に収めることができ、構造面や施工面で合理的になる。防液堤2の底部と段部51の間には、周方向PC鋼材11の緊張時に防液堤2を移動可能とするための隙間が設けられるが、この隙間には充填材30を充填し、防液堤2と底版5の一体性を高めることができる。   Further, in the present embodiment, the entire shape of the tank body can be accommodated in the conventional shape by disposing the bottom portion of the liquid-proof dike 2 having the overhang portions 2a and 2c in the step portion 51 of the bottom plate 5, and It will be rational in terms of construction. A gap is provided between the bottom of the liquid protection embankment 2 and the step portion 51 to allow the liquid protection embankment 2 to move when the circumferential PC steel 11 is tensioned. , The integrity of the liquid barrier 2 and the bottom plate 5 can be enhanced.

また、本実施形態では張出部2a、2cが防液堤2の内外に張出すので施工時の防液堤2の安定性を高めることができ、且つ張出部2a、2cの両方がスリット20、25によってタンク周方向に分割されるので周方向PC鋼材11の量も抑制できる。   Further, in the present embodiment, since the overhanging portions 2a and 2c overhang the inside and the outside of the liquid protection dike 2, the stability of the liquid protection dike 2 at the time of construction can be enhanced, and both the overhanging portions 2a and 2c are slits. Since it is divided in the tank circumferential direction by 20 and 25, the amount of circumferential PC steel 11 can also be suppressed.

また本実施形態では張出部2aにハンチ部21を設けて防液堤2の補強を行うことができ、前記のスリット20はハンチ部21と板状部22に連続して設けられるので周方向PC鋼材11の量も抑制できる。   Further, in the present embodiment, the overhang portion 2a can be provided with the hunches 21 to reinforce the liquid barrier 2, and since the slits 20 are provided continuously to the hunches 21 and the plate-like portion 22, the circumferential direction The amount of PC steel 11 can also be suppressed.

また上記のスリット20にはスリット材23が配置されており、コンクリート打設時にスリット材23によりスリット20を好適に形成することができ、コンクリート打設後にはスリット材23によってスリット20を確保できる。   Further, a slit member 23 is disposed in the above-mentioned slit 20, and the slit 20 can be suitably formed by the slit member 23 at the time of concrete placement, and the slit 20 can be secured by the slit material 23 after concrete placement.

しかしながら、本発明はこれに限らない。例えばスリットは張出部2a、2cのいずれかのみに設けてもよい。   However, the present invention is not limited to this. For example, the slits may be provided only in one of the overhang portions 2a and 2c.

また前記のヘッドバー筋33の代わりに図7に示すようにフープ筋35を設けることも可能である。この場合も、底版5から突出するフープ筋35の先端は、防液堤2の底部から突出するフープ筋35の先端よりも防液堤2側に配置される。   It is also possible to provide hoops 35 as shown in FIG. 7 instead of the head bar 33. Also in this case, the tip end of the hoop streak 35 protruding from the bottom plate 5 is disposed closer to the liquid-defense 2 side than the tip end of the hoop streak 35 protruding from the bottom of the liquid-stop wall 2.

また図8に示すように、張出部2a、2cと底版5をアンカーボルト37a、37bにより一体化してもよい。この例ではアンカーボルト37aが張出部2aに設けられ、アンカーボルト37bが張出部2cに設けられる。アンカーボルト37a、37bの代わりにPC鋼材を用いてもよい。   Further, as shown in FIG. 8, the overhanging portions 2a and 2c and the bottom plate 5 may be integrated by anchor bolts 37a and 37b. In this example, the anchor bolt 37a is provided on the overhang 2a, and the anchor bolt 37b is provided on the overhang 2c. PC steel may be used instead of the anchor bolts 37a and 37b.

アンカーボルト37a、37bの下端は底版5内に埋設され、アンカーボルト37aの上端は張出部2aを箱抜きして形成された凹部であるボルトボックス26aにおいて定着される。同様に、アンカーボルト37bの上端は張出部2cの上面を箱抜きして形成された凹部であるボルトボックス26bにおいて定着される。これらのボルトボックス26a、26bはアンカーボルト37a、37bを設けた後モルタル等の充填材27で充填される。   The lower ends of the anchor bolts 37a and 37b are embedded in the bottom plate 5, and the upper ends of the anchor bolts 37a are fixed in a bolt box 26a which is a recess formed by removing the boxed portion 2a. Similarly, the upper end of the anchor bolt 37b is fixed in a bolt box 26b which is a recess formed by removing the upper surface of the overhang 2c. These bolt boxes 26a and 26b are filled with a filling material 27 such as mortar after the anchor bolts 37a and 37b are provided.

また、ハンチ部21と板状部22の間にシート等の縁切材を設けることでハンチ部21と板状部22の縁を切り、剛性をさらに低下させて周方向PC鋼材11の量を減らすことも可能である。   Further, by providing an edge cutting material such as a sheet between the hunting portion 21 and the plate portion 22, the edges of the hunting portion 21 and the plate portion 22 are cut to further reduce the rigidity and the amount of the circumferential PC steel 11 is obtained. It is also possible to reduce.

また、本実施形態のハンチ部21は直角三角形状であるが、その形状は特に限定されず、図9の張出部2a’に示すようにハンチ部21aを矩形状としてもよい。また本実施形態ではハンチ部に縦方向PC鋼材は不要であるが、ハンチ部に鉛直方向あるいは鉛直方向に対して傾斜した方向の縦方向PC鋼材を配置することも可能である。また場合によってはハンチ部を防液堤2の内側の張出部2cの上に設けることも可能である。   Moreover, although the hunting part 21 of this embodiment is a right-angled triangle shape, the shape is not specifically limited, As shown to overhang part 2a 'of FIG. 9, it is good also considering the hunting part 21a as a rectangular shape. Further, in the present embodiment, the vertical direction PC steel material is unnecessary in the hunt portion, but it is also possible to arrange the vertical direction PC steel material in the vertical direction or a direction inclined to the vertical direction in the hunt portion. In some cases, it is also possible to provide a hunting portion on the inside overhanging portion 2 c of the liquid breakwater 2.

さらに、図10(a)の防液堤2’に示すように張出部2aを省略することも可能であり、あるいは図10(b)の防液堤2”に示すように張出部2cを省略してもよい。   Furthermore, it is possible to omit the overhanging portion 2a as shown in the liquid protection dike 2 'of FIG. 10 (a), or the overhanging portion 2c as shown in the liquid protection dike 2' 'of FIG. 10 (b). May be omitted.

加えて、本発明はLNGタンク1に限らず、タンク周方向に緊張力の導入を行ういわゆるPCタンクであれば適用でき、貯留物もLNGに限らず、LPG等のその他の(極)低温液体でもよいし、水などでもよい。   In addition, the present invention is not limited to the LNG tank 1 but can be applied to any so-called PC tank that introduces tension in the circumferential direction of the tank, and the reservoir is not limited to LNG, and other (extreme) low temperature liquids such as LPG It may be water, etc.

以上、添付図面を参照して、本発明の好適な実施形態について説明したが、本発明は係る例に限定されない。当業者であれば、本願で開示した技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。   The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is apparent that those skilled in the art can conceive of various modifications or alterations within the scope of the technical idea disclosed in the present application, and of course these also fall within the technical scope of the present invention. It is understood.

1、100:LNGタンク
2、2'、2”、6:防液堤
2a、2a'、2c:張出部
2b:等厚部
3a:内槽
3b:外槽鋼板
4:杭
5:底版
7:地盤
8:断熱材
11:周方向PC鋼材
13:縦方向PC鋼材
20、25:スリット
21、21a:ハンチ部
22:板状部
23:スリット材
24:シーリング材
26a、26b:ボルトボックス
28:面取部
27、30:充填材
31:H形鋼
33:ヘッドバー筋
35:フープ筋
37a、37b:アンカーボルト
51:段部
1, 100: LNG tank 2, 2 ′, 2 ′ ′ 6: 6: liquid barrier 2a, 2a ′, 2c: overhang portion 2b: equal thickness portion 3a: inner tank 3b: outer tank steel plate 4: pile 5: bottom plate 7 A ground 8: a heat insulating material 11: a circumferential PC steel 13: a longitudinal PC steel 20, 25: a slit 21, 21 a: a hunched part 22: a plate part 23: a slit 24: a sealing 26a, 26b: a bolt box 28: Facet 27, 30: Filler 31: H-shaped steel 33: Head bar 35: Hoop bar 37a, 37b: Anchor bolt 51: Step

Claims (6)

底版と側壁を含むタンク躯体を有し、
前記側壁の底部は前記底版から隙間を空けて形成され、前記隙間が埋められており、
前記側壁にタンク周方向の緊張力が導入され、
前記側壁の底部に、前記側壁から側方に張出した張出部がタンク周方向に延設され、
前記張出部が、スリットによってタンク周方向に分割されたことを特徴とする地上タンク。
Having a tank body including a bottom plate and side walls,
The bottom of the side wall is formed with a gap from the bottom plate, and the gap is filled,
The circumferential tension of the tank is introduced to the side wall,
At the bottom of the side wall, an overhanging portion extending laterally from the side wall is extended in the circumferential direction of the tank,
The above ground tank characterized in that the overhanging portion is divided in the tank circumferential direction by a slit.
前記底版の外周部に、上面の位置が段状に下がった段部が形成され、
前記側壁の底部は、前記段部に配置されることを特徴とする請求項1記載の地上タンク。
At the outer peripheral portion of the bottom plate, there is formed a step portion in which the position of the upper surface is lowered in steps,
The ground tank according to claim 1, wherein a bottom of the side wall is disposed at the step.
前記張出部は、前記側壁の内側と外側に張出し、
前記内側と外側に張出した張出部の両方が、スリットによってタンク周方向に分割されたことを特徴とする請求項1または請求項2記載の地上タンク。
The overhanging portion overhangs the inside and the outside of the side wall,
The ground tank according to claim 1 or 2, wherein both the inward and outward overhangs are divided in the tank circumferential direction by a slit.
前記張出部は、前記側壁の外側に張出し、
前記外側に張出した張出部は、前記側壁のハンチ部を含むことを特徴とする請求項1から請求項3のいずれかに記載の地上タンク。
The overhanging portion overhangs the outside of the side wall,
The ground tank according to any one of claims 1 to 3, wherein the outwardly overhanging portion includes a hunt portion of the side wall.
前記張出部は、前記側壁の外側に張出し、
前記外側に張出した張出部の前記スリットにスリット材が配置されたことを特徴とする請求項1から請求項4のいずれかに記載の地上タンク。
The overhanging portion overhangs the outside of the side wall,
The above-mentioned ground tank according to any one of claims 1 to 4, wherein a slit material is disposed in the slit of the overhanging portion which protrudes outward.
底版と側壁を含むタンク躯体を有する地上タンクの構築方法であって、
前記底版の上に側壁を形成する工程と、
前記側壁にタンク周方向の緊張力を導入する工程と、
を有し、
前記側壁の底部は前記底版から隙間を空けて形成され、
前記隙間は前記側壁にタンク周方向の緊張力を導入した後に埋められ、
前記側壁の底部に、前記側壁から側方に張出した張出部がタンク周方向に延設され、前記張出部が、スリットによってタンク周方向に分割されたことを特徴とする地上タンクの構築方法。
A method of constructing an above-ground tank having a tank body including a bottom plate and a side wall,
Forming a sidewall on the bottom plate;
Introducing a tension in a circumferential direction of the tank to the side wall;
Have
The bottom of the side wall is formed with a gap from the bottom plate,
The gap is filled after introducing tension in the circumferential direction of the tank to the side wall,
At the bottom of the side wall, an overhanging portion projecting laterally from the side wall is extended in the circumferential direction of the tank, and the overhanging portion is divided in the circumferential direction of the tank by a slit. Method.
JP2017236920A 2017-12-11 2017-12-11 How to build a ground tank and a ground tank Active JP6951961B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002256726A (en) * 2001-03-05 2002-09-11 Kajima Corp Method of constructing prestressed concrete structure and prestressed concrete structure
JP2005306445A (en) * 2004-04-23 2005-11-04 Dps Bridge Works Co Ltd Lateral wall members for pre-cast pc tank and joint structure between lateral wall members and bottom plate
JP2009203787A (en) * 2008-01-28 2009-09-10 Kajima Corp Tank and tank construction method
JP2014167244A (en) * 2013-02-28 2014-09-11 Ohbayashi Corp Pc tank and construction method thereof
JP2015175138A (en) * 2014-03-14 2015-10-05 鹿島建設株式会社 Construction method of tank and dike
JP2016125317A (en) * 2015-01-08 2016-07-11 鹿島建設株式会社 Wall body construction method and wall body

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002256726A (en) * 2001-03-05 2002-09-11 Kajima Corp Method of constructing prestressed concrete structure and prestressed concrete structure
JP2005306445A (en) * 2004-04-23 2005-11-04 Dps Bridge Works Co Ltd Lateral wall members for pre-cast pc tank and joint structure between lateral wall members and bottom plate
JP2009203787A (en) * 2008-01-28 2009-09-10 Kajima Corp Tank and tank construction method
JP2014167244A (en) * 2013-02-28 2014-09-11 Ohbayashi Corp Pc tank and construction method thereof
JP2015175138A (en) * 2014-03-14 2015-10-05 鹿島建設株式会社 Construction method of tank and dike
JP2016125317A (en) * 2015-01-08 2016-07-11 鹿島建設株式会社 Wall body construction method and wall body

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