JP2004293061A - Ground tank construction method - Google Patents

Ground tank construction method Download PDF

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Publication number
JP2004293061A
JP2004293061A JP2003083751A JP2003083751A JP2004293061A JP 2004293061 A JP2004293061 A JP 2004293061A JP 2003083751 A JP2003083751 A JP 2003083751A JP 2003083751 A JP2003083751 A JP 2003083751A JP 2004293061 A JP2004293061 A JP 2004293061A
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Japan
Prior art keywords
tank
roof
opening
ground
outer tank
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JP2003083751A
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Japanese (ja)
Inventor
Yoshiro Umehara
芳郎 梅原
Akira Horiuchi
明 堀内
Yuji Yamada
祐司 山田
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Priority to JP2003083751A priority Critical patent/JP2004293061A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To shorten a construction period by smoothly constructing a tank by carrying materials for an inner tank in an outer tank after constructing the outer tank. <P>SOLUTION: The PC outer tank 2 is constructed by erecting a cylindrical outer tank side plate 5 in a peripheral edge part of a bottom slab. A steel roof 7 is assembled in the PC outer tank 2 by installing a steel plate on a structure 13 composed of a rafter material 11 being a plurality of strength members arranged in the radial direction, and a ring material 12 for connecting the rafter material 11 in the peripheral direction. An opening part is formed between the mutually adjacent rafter materials 11 of the steel roof 7. A peripheral edge part of the steel roof 7 is fixed to the upper end of the outer tank side plate 5 of the PC outer tank 2 by floating the steel roof 7 by pressurizing the PC outer tank 2 and the steel roof 7 in a blocked-up state by installing a blocking-up member in the opening part. The opening part is opened by removing the blocking-up member, and the materials of the steel inner tank are carried in from the opening part, and the steel inner tank is assembled in the PC outer tank 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、例えば、LPGタンクやLNGタンク等の地上式タンクの構築方法に関するものである。
【0002】
【従来の技術】
一般に、LPGタンクやLNGタンク等の地上式タンクは、PC外槽の内部に鋼製内槽を備えた二重殻構造とされている。
この地上式タンクを構成する鋼製内槽は、PC外槽の構築後、PC外槽を構成する外槽側板に開口部を形成し、この開口部から資材を搬入して内部で組み立てられている。
ところで、外槽側板には、プレストレスの導入用ワイヤを通すシース管が設けられているので、開口部を形成することによりシース管を切断しなければならず、したがって、開口部をコンクリートで閉塞し、その後、プレストレスを導入する際に、多大な手間を要していた。また、開口部を閉塞する作業にも手間がかかり、工期の長期化の要因にもなっていた。
このため、PC外槽の構築後に、内槽屋根及び外槽屋根からなる屋根部の肩部において、屋根部の一部を周方向に沿って取り除いて開口部を形成し、この開口部から鋼製内槽の資材を搬入する方法が提案されている(例えば、特許文献1参照)。
【0003】
【特許文献1】
特許第2641088号公報
【0004】
【発明が解決しようとする課題】
ところで、屋根部を構成する鋼製屋根は、図11に示すように、径方向に沿って配設されたアーチ状の複数のラフター材21と、ラフター材21同士を周方向に連結するリング材22とからなる構造体を有している。
そして、このような構造体を有する鋼製屋根において、上記の方法では、鋼製内槽の資材を搬入する開口部を形成するために、強度部材であるラクター材21を切断して取り除かざるを得ず、大幅な強度低下を招いてしまう。
つまり、屋根部は、PC外槽内にて組み立てた後に、PC外槽内に内圧を加えてエアレージングにより外槽側板の頂部に連なる所定高さ位置まで浮上させて周縁部を連結することにより設置しているが、強度部材であるラフター材21を取り除いて資材搬入用の開口部を形成すると、鋼製屋根の強度が大幅に低減するため、エアレージングによる屋根部の設置作業を行うことが困難となる。また、屋根部を設置した後に開口部を形成することも、強度等の面から現実的でなかった。
【0005】
この発明は、上記事情に鑑みてなされたもので、外槽構築後に、内槽用の資材を外槽内に搬入して円滑に構築し、工期の短縮を図ることが可能な地上式タンクの構築方法を提供することを目的としている。
【0006】
【課題を解決するための手段】
上記目的を達成するために、請求項1記載の地上式タンクの構築方法は、底版の周縁部に円筒状の側板を立設した外槽の上部に屋根部を設置し、その後、前記外槽内に搬入した資材を組み立てて外槽内に内槽を構築する地上式タンクの構築方法であって、前記屋根部に、その径方向に沿って開口部を形成しておき、この屋根部の前記外槽の上部への設置後に、前記開口部から前記内槽の資材を搬入することを特徴としている。
【0007】
この地上式タンクの構築方法によれば、外槽内に内槽用の資材を搬入する開口部を屋根部の径方向に沿って形成するので、屋根部の径方向に配設される強度部材を切断することがなく、開口部を形成することによる屋根部の強度低下を防止することができる。
これにより、強度低下により屋根部の設置作業に制約を受けるような不具合なく、例えば、外槽内を加圧して屋根部を浮上させるエアレージングによる設置作業を円滑に行うことができ、工期の短縮を図ることができる。
【0008】
請求項2記載の地上式タンクの構築方法は、前記屋根部が、径方向に配設された強度部材である複数のラフター材と、これらラフター材を周方向に連結するリング材とからなる構造体を有し、前記開口部を、互いに隣接する前記ラフター材同士の間に形成することを特徴としている。
この地上式タンクの構築方法によれば、互いに隣接するラフター材同士の間に内槽用資材を搬入する開口部を形成するので、屋根部の強度低下を招くことがなく、円滑に構築作業を行うことができる。
【0009】
請求項3記載の地上式タンクの構築方法は、前記屋根部の一部が、各種機材が設置される荷重部とされ、前記開口部を前記荷重部から外れた位置に形成することを特徴としている。
この地上式タンクの構築方法によれば、荷重が加わる荷重部から外れた位置に開口部を形成するので、開口部を形成しても荷重部において、その補強や機材の設置などを円滑に行うことができる。
【0010】
請求項4記載の地上式タンクの構築方法は、底版の周縁部に円筒状の側板を立設した外槽の上部に屋根部を設置し、その後、前記外槽内に搬入した資材を組み立てて外槽内に内槽を構築する地上式タンクの構築方法であって、前記屋根部に、その径方向に沿って開口部を形成し、この開口部を閉塞する閉塞部材を着脱可能としておき、前記外槽内にて前記屋根部を組み立てて前記開口部に前記閉塞部材を取り付けて閉塞した状態にて、前記外槽と前記屋根部との間を加圧して前記屋根部を浮上させ、浮上させた前記屋根部の周縁部を前記外槽の側板の上端に固着して前記閉塞部材を取り外して前記開口部を開口させ、この開口させた開口部から前記内槽の資材を搬入することを特徴としている。
【0011】
この地上式タンクの構築方法によれば、開口部を閉塞する閉塞部材を着脱可能としておき、外槽と屋根部との間を加圧して屋根部を浮上させるいわゆるエアレージングによる屋根部の設置時には、閉塞部材を開口部に取り付けて閉塞させ、内槽の資材搬入時には閉塞部材を開口部から取り外すので、各工程の作業を円滑に行うことができる。
【0012】
【発明の実施の形態】
以下、本発明の実施形態に係る地上式タンクの構築方法について図面を参照して説明する。
図1に示すように、地上式タンク1は、PC外槽2の内部に鋼製内槽3を備えた二重殻構造とされている。
PC外槽2は、底版4と、この底版4の周縁から立設された外槽側板5とから構成されており、外槽側板5は、周方向に間隔をあけて設けられた図示しないシース管に通したワイヤーを緊張させることにより、軸方向にプレストレスが導入されている。
PC外槽2には、その上部に屋根部6が設置されている。この屋根部6は、その内面側を構成する鋼製屋根7と、外面側を構成するRC屋根8とから構成されている。
【0013】
図2に示すように、鋼製屋根7は、径方向に配列された複数のアーチ状のラフター材11と、これらラフター材11を周方向に連結する複数のリング材12とから構成された構造体13を有している。そして、この鋼製屋根7は、ラフター材11とリング材12とからなる構造体13の上面側に鋼板14を配設した構造とされている。また、鋼製屋根7には、その最外周に、コンプレッションリング13aが設けられており、このコンプレッションリング13aは、PC外槽2の外槽側板5の内面に挿入されている。
【0014】
RC屋根8は、鋼製屋根7の上面側に打設されたコンクリートからなるもので、外周縁部に設けられたコンクリートリング15によって端部が拘束されている。
屋根部6は、外周側近傍位置の一部が、ポンプステージ(荷重部)6aとされており、このポンプステージ6aには、各種ポンプなどが設置されるようになっている。
鋼製内槽3は、底版4上に設置された内槽底版16と、この内槽底版16の周縁から立設された内槽側板17及び吊り屋根9とから構成されている。
【0015】
次に、上記構造の地上式タンク1を構築する本実施形態に係る構築方法についてその手順に沿って説明する。
(1)まず、図3に示すように、底版4の周縁に、外槽側板5を立設させてPC外槽2を構築し、外槽側板5の図示しないシース管に通したワイヤーを緊張させて外槽側板5の軸方向にプレストレスを導入する。
【0016】
(2)次いで、図4に示すように、PC外槽2の内部にて、ラフター材11及びリング材12からなる構造体13を組み立て、その上面に鋼板14を配設して固定し、鋼製屋根7を構築する。
ここで、この鋼製屋根7には、図5に示すように、ラフター材同士の間における鋼板14及びリング材12を取り除いた開口部7aを形成しておく。
なお、この開口部7aは、その後、ポンプステージ6aとなる位置から外れた位置に形成する。
【0017】
(3)次に、鋼製屋根7に形成した開口部7aに、図6に示すような、リング材12と鋼板18とからなる閉塞部材19を、例えば溶接あるいはボルト・ナットにより仮付けし、この開口部7aを閉塞する。
【0018】
(4)鋼製屋根7を組み立てたら、PC外槽2と鋼製屋根7との間にエアーを送り込んで加圧し、エアーレイジングによって鋼製屋根7を浮上させ、図7に示すように、内槽屋根7の周縁部をPC外槽2の外槽側板5の上端に固着させる。
【0019】
(5)鋼製屋根7の周縁部を外槽側板5の上端に固着させて設置したら、閉塞部材19を取り外し、開口部7aを開口させ、図8に示すように、この開口部7aから鋼製内槽3を構成する資材3aを、クレーン等によって吊り下げてPC外槽2の内部に搬入する。
【0020】
(6)図9に示すように、PC外槽2内に搬入した鋼製内槽3の資材3aをPC外槽2内にて組み立てて、鋼製内槽3を構築する。
【0021】
(7)鋼製内槽3を構築したら、内槽屋根7の開口部7aに閉塞部材19を取り付けて開口部7aを閉塞させる。
なお、開口部7aにおける閉塞部材19の脱着は、鋼製屋根7上にて行うことことができるが、作業用の吊デッキを設置し、この吊デッキ上にて行うこともできる。
【0022】
(8)次に、PC外槽2内に内圧を加えながら、図10に示すように、鋼製屋根7の上面側にコンクリートを打設して硬化させることにより外槽屋根8を構築して屋根部6を完成させる。
【0023】
(9)その後、外周縁に取り付けたコンクリートリング15によって屋根部6と外槽側板とを一体化し、図1に示した地上式タンク1を完成させる。
【0024】
このように、上記実施形態に係る地上式タンクの構築方法によれば、PC外槽2内に鋼製内槽3用の資材3aを搬入する開口部7aを屋根部6の鋼製屋根7の径方向に沿って形成するので、鋼製屋根7の径方向に配設される強度部材であるラフター材11を切断することがなく、開口部7aを形成することによる屋根部6の強度低下を防止することができる。
【0025】
つまり、互いに隣接するラフター材11同士の間に鋼製内槽3用の資材3aを搬入する開口部7aを形成するので、屋根部6の強度低下を招くことがなく、これにより、強度低下により屋根部6の設置作業に制約を受けるような不具合なく、例えば、PC外槽2内を加圧して屋根部6の鋼製屋根7を浮上させるエアレージングによる設置作業を円滑に行うことができ、工期の短縮を図ることができる。
【0026】
さらには、荷重が加わる荷重部であるポンプステージ6aから外れた位置に開口部7aを形成するので、開口部7aを形成してもポンプステージ6aにおいて、その補強や機材の設置などを円滑に行うことができる。
【0027】
また、開口部7aを閉塞する閉塞部材19を着脱可能としておき、PC外槽2と屋根部6を構成する鋼製屋根7との間を加圧して浮上させるいわゆるエアレージングによる設置作業時には、閉塞部材19を開口部7aに取り付けて閉塞させ、鋼製内槽3の資材3aの搬入時には閉塞部材19を開口部7aから取り外すので、各工程の作業を円滑に行うことができる。
【0028】
なお、上記の例では、RC屋根8を構築するために、PC外槽2内に内圧を加えながら、鋼製屋根7の上面にコンクリートを打設したが、本実施形態では、強度部材であるラフター材11を切断することなく開口部7aを形成しているので、PC外槽2内に内圧を加えることなく、開口部7aを開口させた状態にて鋼製屋根7上にコンクリートを打設し、RC屋根8を構築することもでき、これにより、作業の高効率化を図ることができる。
また、上記例では、屋根部6のRC屋根8を、鋼製屋根7上に打設したコンクリートによって構築したが、鋼製屋根7単独の構造とする場合もある。
【0029】
【発明の効果】
以上、説明したように、本発明の地上式タンクの構築方法によれば、外槽内に内槽用の資材を搬入する開口部を屋根部の径方向に沿って形成するので、屋根部の径方向に配設される強度部材を切断することがなく、開口部を形成することによる屋根部の強度低下を防止することができる。
これにより、強度低下により屋根部の設置作業に制約を受けるような不具合なく、例えば、外槽内を加圧して屋根部を浮上させるエアレージングによる設置作業を円滑に行うことができ、工期の短縮を図ることができる。
また、開口部を閉塞する閉塞部材を着脱可能としておき、外槽と屋根部との間を加圧して屋根部を浮上させるいわゆるエアレージングによる屋根部の設置時には、閉塞部材を開口部に取り付けて閉塞させ、内槽の資材搬入時には閉塞部材を開口部から取り外すので、各工程の作業を円滑に行うことができる。
【図面の簡単な説明】
【図1】本発明の実施形態に係る地上式タンクの構築方法によって構築された地上式タンクの概略断面図である。
【図2】地上式タンクの屋根部を鋼製する鋼製屋根の構造体を説明する構造体の平面図である。
【図3】地上式タンクの構築方法の手順を説明する構築途中の地上式タンクの概略断面図である。
【図4】地上式タンクの構築方法の手順を説明する構築途中の地上式タンクの概略断面図である。
【図5】地上式タンクの構築方法の手順を説明する構築途中の地上式タンクの概略平面図である。
【図6】鋼製屋根の開口部に着脱される閉塞部材を説明する閉塞部材の平面図である。
【図7】地上式タンクの構築方法の手順を説明する構築途中の地上式タンクの概略断面図である。
【図8】地上式タンクの構築方法の手順を説明する構築途中の地上式タンクの概略断面図である。
【図9】地上式タンクの構築方法の手順を説明する構築途中の地上式タンクの概略断面図である。
【図10】地上式タンクの構築方法の手順を説明する構築途中の地上式タンクの概略断面図である。
【図11】従来の構築方法における屋根部への開口の仕方を説明する屋根部の一部の平面図である。
【符号の説明】
1 地上式タンク
2 PC外槽(外槽)
3 鋼製内槽(内槽)
3a 資材
4 底版
5 外槽側板(側板)
6 屋根部
6a ポンプステージ(荷重部)
7 鋼製屋根(屋根部)
8 RC屋根
9 吊り屋根
11 ラフター材
12 リング材
13 構造体
13a コンプレッションリング(リングプレート)
14 鋼製屋根骨
15 コンクリートリング
16 内槽底板
17 開口部
18 閉塞部材(鋼製屋根板)
19 閉塞部材
21 ラフタ−材
22 リング材
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for constructing an above-ground tank such as an LPG tank or an LNG tank.
[0002]
[Prior art]
Generally, a ground-type tank such as an LPG tank or an LNG tank has a double shell structure including a steel inner tank inside a PC outer tank.
After the construction of the PC outer tub, the steel inner tub constituting this ground-type tank forms an opening in the outer tub side plate constituting the PC outer tub, and the material is carried in from the opening to be assembled inside. I have.
By the way, since the outer tube side plate is provided with a sheath tube through which a wire for introducing prestress is passed, the sheath tube must be cut by forming an opening, and therefore, the opening is closed with concrete. After that, when introducing prestress, a great deal of trouble was required. In addition, the work of closing the opening is also troublesome, which has been a factor of lengthening the construction period.
For this reason, after the construction of the PC outer tank, an opening is formed by removing a part of the roof along the circumferential direction at the shoulder of the roof consisting of the inner tank roof and the outer tank roof. There has been proposed a method of carrying materials in an in-house tank (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 2641088 [0004]
[Problems to be solved by the invention]
Incidentally, as shown in FIG. 11, the steel roof constituting the roof portion includes, as shown in FIG. 11, a plurality of arch-shaped rafter members 21 arranged along a radial direction, and a ring member for connecting the rafter members 21 to each other in a circumferential direction. 22.
In the steel roof having such a structure, in the above-described method, in order to form an opening for carrying the material of the steel inner tank, the lactor material 21 which is a strength member has to be cut and removed. It cannot be obtained, resulting in a significant decrease in strength.
In other words, after assembling in the PC outer tub, the roof is floated to a predetermined height position connected to the top of the outer tub side plate by applying internal pressure to the PC outer tub and performing air lasing to connect the peripheral edges. Although it is installed, if the opening for material introduction is formed by removing the rougher material 21 which is a strength member, the strength of the steel roof is significantly reduced, so the installation work of the roof part by air lasing may be performed. It will be difficult. In addition, it is not practical to form an opening after installing the roof in terms of strength and the like.
[0005]
The present invention has been made in view of the above circumstances, and after the outer tank is constructed, a material for the inner tank is carried into the outer tank to be smoothly constructed, and a ground-type tank capable of shortening the construction period is provided. It aims to provide a construction method.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a method for constructing a ground-based tank according to claim 1, wherein a roof is installed on an upper part of an outer tank having a cylindrical side plate erected on a peripheral portion of a bottom plate, and thereafter, the outer tank is provided. A method of constructing an above-ground tank that assembles materials brought into the tank and forms an inner tank in an outer tank, wherein an opening is formed in the roof along a radial direction thereof, and After installation on the upper part of the outer tank, the material of the inner tank is carried in from the opening.
[0007]
According to the method of constructing the above-ground tank, since the opening for carrying the material for the inner tank is formed in the outer tank along the radial direction of the roof part, the strength member disposed in the radial direction of the roof part , And the strength of the roof can be prevented from being reduced by forming the opening.
This makes it possible to smoothly perform the installation work by, for example, air lasing that pressurizes the outer tub and raises the roof part without any trouble that the installation work of the roof part is restricted due to the reduction in strength, and shortens the construction period. Can be achieved.
[0008]
The construction method of a ground-type tank according to claim 2, wherein the roof portion includes a plurality of roughing members that are strength members disposed in a radial direction and a ring member that connects the roughing members in a circumferential direction. And a body, wherein the opening is formed between the rough material adjacent to each other.
According to this method of constructing the above-ground tank, since the opening for carrying the inner tank material is formed between the rougher materials adjacent to each other, the strength of the roof portion is not reduced, and the construction work is smoothly performed. It can be carried out.
[0009]
The method for constructing a ground-based tank according to claim 3, wherein a part of the roof portion is a load portion on which various equipment is installed, and the opening is formed at a position off the load portion. I have.
According to this method of constructing a ground-based tank, since the opening is formed at a position deviating from the load portion to which the load is applied, even if the opening is formed, the reinforcement and installation of equipment and the like are smoothly performed at the load portion. be able to.
[0010]
In the method for constructing a ground-based tank according to claim 4, a roof is installed on an upper portion of an outer tank having a cylindrical side plate erected on the periphery of the bottom plate, and thereafter, the materials carried into the outer tank are assembled. A method for constructing an above-ground tank for constructing an inner tank in an outer tank, wherein an opening is formed in the roof along the radial direction thereof, and a closing member for closing the opening is detachably provided. In a state where the roof portion is assembled in the outer tub and the closing member is attached to the opening and closed, the space between the outer tub and the roof portion is pressurized to float the roof portion, and float. Fixing the peripheral portion of the roof portion to the upper end of the side plate of the outer tank, removing the closing member, opening the opening, and carrying in the material of the inner tank from the opened opening. Features.
[0011]
According to this method of constructing a ground-based tank, a closing member that closes the opening is made detachable, and when the roof is installed by so-called air lasing that pressurizes the outer tank and the roof to float the roof. Since the closing member is attached to the opening to close the opening, and the closing member is removed from the opening when the material is carried into the inner tank, the work of each process can be performed smoothly.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a method of constructing a ground-based tank according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the above-ground tank 1 has a double shell structure including a steel inner tank 3 inside a PC outer tank 2.
The PC outer tub 2 is composed of a bottom plate 4 and an outer tub side plate 5 erected from the periphery of the bottom slab 4, and the outer tub side plate 5 is provided with a sheath (not shown) provided at intervals in the circumferential direction. Prestress is introduced in the axial direction by tensioning the wire through the tube.
The PC outer tub 2 is provided with a roof 6 on the upper part thereof. The roof part 6 is composed of a steel roof 7 constituting the inner surface side and an RC roof 8 constituting the outer surface side.
[0013]
As shown in FIG. 2, the steel roof 7 includes a plurality of arched rough members 11 arranged in a radial direction and a plurality of ring members 12 connecting the rough members 11 in a circumferential direction. It has a body 13. The steel roof 7 has a structure in which a steel plate 14 is disposed on an upper surface side of a structure 13 including a rough material 11 and a ring material 12. The steel roof 7 is provided with a compression ring 13 a at the outermost periphery thereof, and the compression ring 13 a is inserted into the inner surface of the outer tank side plate 5 of the PC outer tank 2.
[0014]
The RC roof 8 is made of concrete cast on the upper surface side of the steel roof 7, and its end is restrained by a concrete ring 15 provided on the outer peripheral edge.
A part of the roof 6 near the outer peripheral side is a pump stage (loading portion) 6a, and various pumps and the like are installed on the pump stage 6a.
The steel inner tank 3 includes an inner tank bottom plate 16 installed on the bottom plate 4, an inner tank side plate 17 erected from the periphery of the inner tank bottom plate 16, and a suspension roof 9.
[0015]
Next, a construction method according to the present embodiment for constructing the above-ground tank 1 having the above structure will be described along the procedure.
(1) First, as shown in FIG. 3, an outer tub side plate 5 is erected on the periphery of the bottom plate 4 to construct a PC outer tub 2, and a wire passed through a sheath tube (not shown) of the outer tub side plate 5 is tensioned. Then, prestress is introduced in the axial direction of the outer tank side plate 5.
[0016]
(2) Next, as shown in FIG. 4, a structure 13 composed of a rougher material 11 and a ring material 12 is assembled inside the PC outer tank 2, and a steel plate 14 is disposed and fixed on the upper surface thereof. A roof 7 made of steel is constructed.
Here, as shown in FIG. 5, the steel roof 7 has an opening 7a formed by removing the steel plate 14 and the ring member 12 between the rougher members.
The opening 7a is formed at a position deviating from the position to be the pump stage 6a.
[0017]
(3) Next, as shown in FIG. 6, a closing member 19 composed of a ring member 12 and a steel plate 18 is temporarily attached to the opening 7a formed in the steel roof 7 by, for example, welding or bolts and nuts. This opening 7a is closed.
[0018]
(4) After assembling the steel roof 7, air is sent between the PC outer tub 2 and the steel roof 7 to pressurize the steel roof 7, and the steel roof 7 is floated by air lasing, as shown in FIG. 7. The periphery of the tank roof 7 is fixed to the upper end of the outer tank side plate 5 of the PC outer tank 2.
[0019]
(5) When the peripheral portion of the steel roof 7 is fixed to the upper end of the outer tub side plate 5 and installed, the closing member 19 is removed, the opening 7a is opened, and as shown in FIG. The material 3a constituting the inner production tank 3 is suspended by a crane or the like and carried into the PC outer tank 2.
[0020]
(6) As shown in FIG. 9, the material 3a of the steel inner tub 3 carried into the PC outer tub 2 is assembled in the PC outer tub 2 to construct the steel inner tub 3.
[0021]
(7) After the steel inner tank 3 is constructed, the closing member 19 is attached to the opening 7a of the inner tank roof 7 to close the opening 7a.
The attachment / detachment of the closing member 19 at the opening 7a can be performed on the steel roof 7, but it is also possible to install a work suspension deck and perform the work on this suspension deck.
[0022]
(8) Next, as shown in FIG. 10, concrete is cast on the upper surface side of the steel roof 7 and hardened while applying internal pressure to the PC outer tank 2 to construct the outer tank roof 8. The roof 6 is completed.
[0023]
(9) Thereafter, the roof 6 and the outer tank side plate are integrated by the concrete ring 15 attached to the outer peripheral edge, and the above-ground tank 1 shown in FIG. 1 is completed.
[0024]
As described above, according to the method for constructing a ground-type tank according to the above-described embodiment, the opening 7 a for carrying the material 3 a for the steel inner tank 3 into the PC outer tank 2 is formed by the steel roof 7 of the roof 6. Since it is formed along the radial direction, the strength reduction of the roof portion 6 due to the formation of the opening 7a can be prevented without cutting the roughing member 11 which is a strength member disposed in the radial direction of the steel roof 7. Can be prevented.
[0025]
That is, since the opening 7a for carrying the material 3a for the steel inner tub 3 is formed between the adjacent rougher materials 11, the strength of the roof 6 does not decrease, and thus the strength decreases. For example, the installation work by air lasing that pressurizes the inside of the PC outer tub 2 and floats the steel roof 7 of the roof part 6 can be smoothly performed without any trouble that the installation work of the roof part 6 is restricted. The construction period can be shortened.
[0026]
Further, since the opening 7a is formed at a position deviated from the pump stage 6a, which is a load portion to which a load is applied, even if the opening 7a is formed, the pump stage 6a smoothly reinforces and installs equipment. be able to.
[0027]
In addition, a closing member 19 that closes the opening 7a is made detachable, so that the space between the PC outer tub 2 and the steel roof 7 that constitutes the roof 6 is pressurized and floated during installation work by so-called air lasing. The member 19 is attached to the opening 7a to be closed, and when the material 3a of the steel inner tank 3 is carried in, the closing member 19 is removed from the opening 7a, so that the work of each step can be performed smoothly.
[0028]
In the above example, in order to construct the RC roof 8, concrete is cast on the upper surface of the steel roof 7 while applying internal pressure to the PC outer tub 2. However, in the present embodiment, the concrete roof is a strength member. Since the opening 7a is formed without cutting the rougher material 11, concrete is cast on the steel roof 7 with the opening 7a opened without applying internal pressure in the PC outer tank 2. In addition, the RC roof 8 can be constructed, and thereby, the efficiency of the operation can be improved.
Further, in the above example, the RC roof 8 of the roof portion 6 is constructed of concrete cast on the steel roof 7, but may be a structure of the steel roof 7 alone.
[0029]
【The invention's effect】
As described above, according to the method for constructing a ground tank of the present invention, the opening for carrying the material for the inner tank is formed in the outer tank along the radial direction of the roof. The strength member disposed in the radial direction is not cut, and the strength of the roof can be prevented from being reduced by forming the opening.
As a result, for example, the installation work by air lasing that pressurizes the inside of the outer tub and floats the roof can be performed smoothly without a problem that the installation work of the roof part is restricted by the reduction in strength, and the construction period is shortened. Can be achieved.
In addition, a closing member that closes the opening is made detachable, and when the roof is installed by so-called air lasing that pressurizes the outer tank and the roof to float the roof, the closing member is attached to the opening. The closing member is removed from the opening at the time of carrying the material into the inner tank when closing the inner tank, so that the work of each step can be performed smoothly.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a ground tank constructed by a method of constructing a ground tank according to an embodiment of the present invention.
FIG. 2 is a plan view of a structure for explaining a structure of a steel roof in which a roof portion of the above-ground tank is made of steel.
FIG. 3 is a schematic cross-sectional view of a ground tank in the middle of construction for explaining a procedure of a method of building a ground tank.
FIG. 4 is a schematic cross-sectional view of a ground tank under construction for explaining a procedure of a method of building a ground tank.
FIG. 5 is a schematic plan view of the ground tank under construction for explaining the procedure of the method of building a ground tank.
FIG. 6 is a plan view of a closing member for explaining a closing member attached to and detached from an opening of a steel roof.
FIG. 7 is a schematic cross-sectional view of a ground tank under construction for explaining a procedure of a method of building a ground tank.
FIG. 8 is a schematic cross-sectional view of a ground tank under construction for explaining a procedure of a method of building a ground tank.
FIG. 9 is a schematic cross-sectional view of a ground tank under construction for explaining a procedure of a method of building a ground tank.
FIG. 10 is a schematic cross-sectional view of the ground tank under construction for explaining the procedure of the method of building the ground tank.
FIG. 11 is a plan view of a part of a roof for explaining how to open the roof in a conventional construction method.
[Explanation of symbols]
1 Ground tank 2 PC outer tank (outer tank)
3 steel inner tank (inner tank)
3a Material 4 Bottom plate 5 Outer tank side plate (side plate)
6 Roof 6a Pump stage (load section)
7 Steel roof (roof)
8 RC roof 9 Suspended roof 11 Rough material 12 Ring material 13 Structure 13a Compression ring (ring plate)
14 steel roof bone 15 concrete ring 16 inner tank bottom plate 17 opening 18 closing member (steel roof plate)
19 Closing member 21 Rafter material 22 Ring material

Claims (4)

底版の周縁部に円筒状の側板を立設した外槽の上部に屋根部を設置し、その後、前記外槽内に搬入した資材を組み立てて外槽内に内槽を構築する地上式タンクの構築方法であって、
前記屋根部に、その径方向に沿って開口部を形成しておき、この屋根部の前記外槽の上部への設置後に、前記開口部から前記内槽の資材を搬入することを特徴とする地上式タンクの構築方法。
A roof is installed on the upper part of the outer tank where the cylindrical side plate is erected on the periphery of the bottom slab, and then, the ground tank that assembles the materials brought into the outer tank and builds the inner tank in the outer tank A construction method,
An opening is formed in the roof along the radial direction, and after the roof is installed on the upper portion of the outer tank, the material of the inner tank is carried in from the opening. How to build a ground tank.
前記屋根部は、径方向に配設された強度部材である複数のラフター材と、これらラフター材を周方向に連結するリング材とからなる構造体を有し、前記開口部を、互いに隣接する前記ラフター材同士の間に形成することを特徴とする請求項1記載の地上式タンクの構築方法。The roof has a structure including a plurality of roughing members, which are strength members arranged in a radial direction, and a ring member connecting the roughing members in a circumferential direction, and the openings are adjacent to each other. The method for constructing a ground-type tank according to claim 1, wherein the tank is formed between the rougher materials. 前記屋根部は、その一部が、各種機材が設置される荷重部とされ、前記開口部を前記荷重部から外れた位置に形成することを特徴とする請求項1または請求項2記載の地上式タンクの構築方法。3. The ground according to claim 1, wherein a part of the roof portion is a load portion on which various equipment is installed, and the opening is formed at a position off the load portion. 4. How to build a tank. 底版の周縁部に円筒状の側板を立設した外槽の上部に屋根部を設置し、その後、前記外槽内に搬入した資材を組み立てて外槽内に内槽を構築する地上式タンクの構築方法であって、
前記屋根部に、その径方向に沿って開口部を形成し、この開口部を閉塞する閉塞部材を着脱可能としておき、
前記外槽内にて前記屋根部を組み立てて前記開口部に前記閉塞部材を取り付けて閉塞した状態にて、前記外槽と前記屋根部との間を加圧して前記屋根部を浮上させ、
浮上させた前記屋根部の周縁部を前記外槽の側板の上端に固着して前記閉塞部材を取り外して前記開口部を開口させ、
この開口させた開口部から前記内槽の資材を搬入することを特徴とする地上式タンクの構築方法。
A roof is installed on the upper part of the outer tank where the cylindrical side plate is erected on the periphery of the bottom slab, and then, the ground tank that assembles the materials brought into the outer tank and builds the inner tank in the outer tank A construction method,
An opening is formed in the roof along the radial direction, and a closing member for closing the opening is detachably provided.
In a state where the roof is assembled in the outer tub and the closing member is attached to the opening and closed, the pressure is applied between the outer tub and the roof to float the roof,
The peripheral portion of the raised roof portion is fixed to the upper end of the side plate of the outer tub, the closing member is removed, and the opening is opened,
A method for constructing a ground-type tank, wherein the material of the inner tank is carried in from the opened portion.
JP2003083751A 2003-03-25 2003-03-25 Ground tank construction method Withdrawn JP2004293061A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100924745B1 (en) 2009-07-16 2009-11-05 주식회사 엔티시스템 Water tank having a function of reinforcement by prestressed concrete steel wire
JP2011084960A (en) * 2009-10-16 2011-04-28 Ihi Corp Storage tank
CN104675171A (en) * 2015-01-31 2015-06-03 陕西建工安装集团有限公司 Construction method for single-piece hoisting of aluminum alloy vault of large vertical storage tank

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100924745B1 (en) 2009-07-16 2009-11-05 주식회사 엔티시스템 Water tank having a function of reinforcement by prestressed concrete steel wire
JP2011084960A (en) * 2009-10-16 2011-04-28 Ihi Corp Storage tank
CN104675171A (en) * 2015-01-31 2015-06-03 陕西建工安装集团有限公司 Construction method for single-piece hoisting of aluminum alloy vault of large vertical storage tank

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