JP3864062B2 - Tank roof fixing method - Google Patents

Tank roof fixing method Download PDF

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Publication number
JP3864062B2
JP3864062B2 JP2001157320A JP2001157320A JP3864062B2 JP 3864062 B2 JP3864062 B2 JP 3864062B2 JP 2001157320 A JP2001157320 A JP 2001157320A JP 2001157320 A JP2001157320 A JP 2001157320A JP 3864062 B2 JP3864062 B2 JP 3864062B2
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JP
Japan
Prior art keywords
roof
side wall
concrete
roof structure
tank
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 - Lifetime
Application number
JP2001157320A
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Japanese (ja)
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JP2002349087A (en
Inventor
文男 鎌田
丈能 西崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Obayashi Corp
Osaka Gas Co Ltd
Original Assignee
Obayashi Corp
Osaka Gas Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Obayashi Corp, Osaka Gas Co Ltd filed Critical Obayashi Corp
Priority to JP2001157320A priority Critical patent/JP3864062B2/en
Publication of JP2002349087A publication Critical patent/JP2002349087A/en
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Description

【0001】
【発明の属する技術分野】
本発明は、液化天然ガスなどの液化ガスを貯蔵するためのタンクの構築方法に関し、特にその屋根を躯体に固定するための方法に関する。
【0002】
【従来の技術】
コンクリート製側壁を二次容器(防液堤)とした地上式の低温タンク構造を例に説明する。例えば図3に示すように、液の流出を防ぐためのコンクリート製の防液堤1を保冷材などが外周に配置されてなるタンク内槽2の外側に近接して構築し、防液堤1がタンク内槽2と見掛け上一体化された構造体となっている。
【0003】
このような防液堤1は、その頂部に外槽屋根を固定するための屋根骨アンカー5(例えば、H型鋼を切り欠いて製作)がその上部に一体化された所定形状の鋼製ライナー3を先行して建て込んだ後、ライナー3の外側に補強鋼材を組み立ててからコンクリートを打設するといった手順で構築される。
【0004】
そして、同図の低温タンクは、底版上で作製された屋根構造体4を上方に引上げ、これの周縁において簡易な屋根仮設金物6で屋根骨部(例えば144本)を溶接支持して仮固定するとともに、鋼製ライナー3の頂部と屋根構造体4の屋根板4aとを溶接し、その後、屋根骨連結ピース8を屋根骨アンカー5に連結して、それと屋根骨4bとを添接板9を用いて連結する方法が採られていた。なお、屋根仮設金物6は連結完了後に撤去されていた。
【0005】
【発明が解決しようとする課題】
しかしながら、この方法では、次に述べるような技術的課題があった。先ず、真円により近づけるように外側鋼製ライナー3の建込み・組立て精度を確保する必要があるため、作業が極めて煩雑で長時間を要する。また、防液堤1の鉄筋、補強鋼材などの組立作業も行わなければならず、施工しにくい条件下での組立て作業となるため、作業に手間と時間を要する。さらに、鋼製ライナー3と屋根骨の連結ピース、添接板を用いた溶接作業にも手間と時間がかかるものとなっていた。
【0006】
本発明は、以上の課題を解決するものであって、その目的は、防液堤の構築及び屋根支持部分の組立てを容易にし、もって工期を短縮することができコストダウンを図ることができるタンクの屋根固定方法を提供するものである。
【0007】
【課題を解決するための手段】
前記目的を達成するために、本発明の請求項1に係るタンクの屋根固定方法は、コンクリート側壁の頂部内側近傍に屋根係止金具を埋込んだ状態でコンクリートを打設することにより該コンクリート側壁を完成させる工程と、底版上で屋根構造体を組立てた後、該屋根構造体を前記コンクリート側壁の頂部まで浮上させ、その屋根骨を前記係止金具に位置決め当接させる工程と前記屋根構造体と前記コンクリート側壁の頂部との間に支持金物を跨らせて、前記屋根構造体と前記係止金具との間を前記支持金物を介して溶接により固定するとともに、前記支持金物を前記コンクリート側壁の頂部に固定する工程と、前記コンクリート側壁頂部と前記屋根構造体の端部に前記支持金物を埋設する状態でコンクリートを打設し、屋根を一体化したタンク外槽部を完成させる工程とを具備したことを特徴とする。
また、本発明の請求項2に係るタンクの屋根固定方法は、請求項1に記載のタンクの屋根固定方法であって前記支持金物を、前記コンクリート側壁の頂部に埋設させたアンカーに係止部材を用いて固定することを特徴とする。
【0008】
【発明の実施の形態】
以下、本発明の好ましい実施の形態につき、添付図面を参照して詳細に説明する。図1(a)〜(d),図2は本発明の構築手順を示している。なお、同図において、前記と同一部材には同一符号を付し、新たに説明する箇所および新たに付加された部材にのみ新たな符号を用いて説明する。
【0009】
先ず、図1(a)において、図示しない底版を構築した後、または底版の構築と併行して、従来のように、屋根骨アンカー付き鋼製ライナーを建て込むことなく、またはこれに先行して、防液堤1の躯体を構成する主筋および横筋などの鋼材1aを組立てる。このとき、防液堤1の頂部内側位置には鋼材1aの組立時、あるいは型枠12の組立て後において屋根骨アンカーとなる例えばリング状ないしは円弧状にして断面L字状の係止金具10及び後述する支持金物14を固定するためのアンカー11を予め固定状態に組付けておく。係止金具10は、垂直部が防液堤1の内周部に位置し、水平部が後に上昇される屋根を係止すべく内方に向けて延びている。また、係止金具10の背面側(外側)には防液堤1の躯体内に埋設されるアンカーの一端が固定されている、
次いで、図1(b)に示すように、型枠12内部にコンクリートを打設する。コンクリートが硬化し、型枠12を撤去することにより、防液堤1の構築が完成する(図1(c))。
【0010】
以上の作業終了後、または以上の作業と併行して、底版(図示しない)上で屋根構造体4を組立形成する。そして、底版上で作られたH型鋼等からなる屋根構造体4を、例えば、特開2000−73602公報や特開2000−73384公報等に記載されているように空気圧などを利用して浮揚させ、屋根構造体4の屋根骨4bの周囲を係止金具10の水平部下部に位置決め当接する(図1(d))。
【0011】
次いで、屋根構造体4の外周部と係止金具10との間を両者に跨がる支持金物14(例えば、H型鋼を加工してなる)により溶接固定するとともにアンカーに係止部材15を用いて固定し、さらに係止金具10の水平部端部と屋根構造体4の屋根板4aとを溶接固定する。
【0012】
その後、図2に示すように、防液堤1の頂部に鉄筋7aを配筋し、支持金物14を一体に埋設した状態で屋根構造体4の周縁に鉄筋コンクリート7を一体化し、防液堤1の頂部に屋根構造体4を完全一体化することにより、屋根支承部の構築が完了する。
【0013】
【発明の効果】
以上の説明により明らかなように、本発明によるタンクの屋根固定方法によれば、屋根骨アンカーとなる係止金具が予め防液堤の躯体に取付けられているので、屋根骨アンカーを防液堤躯体内に埋込むための煩雑な手順、作業を不要とすることができ、防液堤の構築を容易にし、もって工期を短縮することができコストダウンを図ることができる。
また、屋根構造体を浮上させて屋根骨を係止金具に当接させることにより、屋根構造体を所定の位置に位置決めすることができ、そして、この状態で、屋根構造体の屋根骨と係止金具との間を支持金物を介して溶接により固定し、支持金物をコンクリート側壁の頂部に固定することにより、屋根構造体をコンクリート側壁に固定することができる。従って、屋根構造体のコンクリート側壁への固定を容易にすることができ、工期を短縮することができ、工費を削減することができる。
【図面の簡単な説明】
【図1】(a)〜(d)は本発明方法における構築手順を示す部分断面説明図である。
【図2】図1に引続く構築手順を示す部分断面図である。
【図3】従来の構築手順を説明するための部分断面図である。
【符号の説明】
1 防液堤
1a 鋼材
2 内槽
4 屋根構造体
4a 屋根板
4b 屋根骨
6 支持金物
10 係止金具
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a tank for storing liquefied gas such as liquefied natural gas, and more particularly to a method for fixing the roof of the tank to a housing.
[0002]
[Prior art]
A ground-type low-temperature tank structure using a concrete side wall as a secondary container (breakwater) will be described as an example. For example, as shown in FIG. 3, a concrete breakwater 1 for preventing the outflow of liquid is constructed in the vicinity of the outside of the tank inner tank 2 in which a cold insulator or the like is arranged on the outer periphery, and the breakwater 1 Is a structure that is apparently integrated with the tank 2.
[0003]
Such a breakwater 1 has a steel liner 3 of a predetermined shape in which a roof bone anchor 5 (for example, manufactured by cutting out H-shaped steel) is integrated at the top thereof for fixing the outer tank roof to the top. Is built in advance, and then the concrete is laid after assembling the reinforcing steel material on the outside of the liner 3.
[0004]
The low-temperature tank shown in the figure pulls up the roof structure 4 produced on the bottom slab upward, and temporarily fixes the roof frame portion (for example, 144 pieces) with a simple roof temporary fitting 6 at the periphery thereof. At the same time, the top of the steel liner 3 and the roof plate 4a of the roof structure 4 are welded, and then the roof bone connecting piece 8 is connected to the roof bone anchor 5, and this is attached to the roof plate 4b. The method of connecting using was taken. The roof temporary hardware 6 was removed after the completion of the connection.
[0005]
[Problems to be solved by the invention]
However, this method has the following technical problems. First, since it is necessary to ensure the accuracy of erection and assembly of the outer steel liner 3 so as to be closer to a perfect circle, the operation is extremely complicated and takes a long time. Moreover, since the assembly work of the rebar of the breakwater 1 and the reinforcing steel material has to be performed, and the assembly work is performed under conditions that are difficult to construct, work and time are required. Furthermore, the welding operation using the steel liner 3 and the connecting piece of the roof bone and the attachment plate takes time and effort.
[0006]
The present invention solves the above problems, and its purpose is to facilitate construction of a breakwater and assembly of a roof support part, thereby shortening the construction period and reducing the cost. The roof fixing method is provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a method for fixing a tank roof according to claim 1 of the present invention includes placing concrete in a state in which a roof locking bracket is embedded in the vicinity of the inside of the top of the concrete side wall. a step to complete the, after assembling the roof structure on the bottom plate, and floated the roof structure to the top of the concrete sidewalls, Ru and the roof bone is positioning contact with the locking fitting step, the roof A support metal is straddled between the structure and the top of the concrete side wall, and the roof structure and the locking bracket are fixed by welding through the support metal, and the support metal is and fixing to the top of the concrete side wall, the concrete in a state of burying the supporting hardware on the end of the roof structure and the concrete side wall top portion and Da設, integrated roof Characterized by comprising a step of completing the ink outer tub portion.
A tank roof fixing method according to claim 2 of the present invention is the tank roof fixing method according to claim 1 , wherein the supporting hardware is locked to an anchor embedded in the top of the concrete side wall. It fixes using a member, It is characterized by the above-mentioned.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIGS. 1A to 1D and 2 show the construction procedure of the present invention. In the figure, the same members as those described above are denoted by the same reference numerals, and only new portions and newly added members will be described using new reference numerals.
[0009]
First, in FIG. 1 (a), after constructing a bottom plate (not shown), or in parallel with construction of the bottom plate, a steel liner with a roof bone anchor is not installed or preceded by a conventional method. Then, the steel material 1a such as the main reinforcement and the transverse reinforcement constituting the enclosure of the breakwater 1 is assembled. At this time, the locking metal fitting 10 having an L-shaped cross section, for example, in a ring shape or an arc shape, which becomes a roof bone anchor when the steel material 1a is assembled or after the formwork 12 is assembled, An anchor 11 for fixing a support hardware 14 to be described later is assembled in a fixed state in advance. As for the locking metal fitting 10, the vertical part is located in the inner peripheral part of the liquid barrier 1, and the horizontal part extends inward to lock the roof that is later raised. In addition, one end of an anchor embedded in the enclosure of the breakwater 1 is fixed to the back side (outside) of the locking metal fitting 10.
Next, as shown in FIG. 1 (b), concrete is placed inside the mold 12. The concrete is hardened and the formwork 12 is removed, whereby the construction of the breakwater 1 is completed (FIG. 1 (c)).
[0010]
After the above work is completed or in parallel with the above work, the roof structure 4 is assembled and formed on the bottom plate (not shown). Then, the roof structure 4 made of H-shaped steel or the like made on the bottom plate is levitated using air pressure or the like as described in, for example, JP-A-2000-73602 and JP-A-2000-73384. Then, the periphery of the roof bone 4b of the roof structure 4 is positioned and brought into contact with the lower part of the horizontal portion of the locking metal fitting 10 (FIG. 1 (d)).
[0011]
Next, the outer peripheral portion of the roof structure 4 and the locking fitting 10 are welded and fixed with a support metal 14 (for example, formed by processing H-shaped steel) across the both, and the locking member 15 is used for the anchor. Then, the horizontal end portion of the locking metal fitting 10 and the roof plate 4a of the roof structure 4 are fixed by welding.
[0012]
Thereafter, as shown in FIG. 2, reinforcing bars 7 a are arranged at the top of the breakwater 1, and the reinforced concrete 7 is integrated with the periphery of the roof structure 4 in a state where the support hardware 14 is embedded integrally. By completely integrating the roof structure 4 on the top of the roof, the construction of the roof support portion is completed.
[0013]
【The invention's effect】
As is apparent from the above description, according to the tank roof fixing method according to the present invention, since the locking metal fitting to be the roof bone anchor is previously attached to the enclosure of the liquid breakwater, the roof bone anchor is attached to the liquid breakwater. Complicated procedures and work for embedding in the housing can be eliminated, the construction of the breakwater can be facilitated, the construction period can be shortened , and the cost can be reduced.
Further, the roof structure can be positioned at a predetermined position by levitating the roof structure and bringing the roof bone into contact with the locking metal fitting. In this state, the roof structure is engaged with the roof bone of the roof structure. The roof structure can be fixed to the concrete side wall by fixing between the fastener and the metal fitting by welding via the support metal and fixing the support metal to the top of the concrete side wall. Therefore, the roof structure can be easily fixed to the concrete side wall, the construction period can be shortened, and the construction cost can be reduced.
[Brief description of the drawings]
FIGS. 1A to 1D are partial cross-sectional explanatory views showing a construction procedure in the method of the present invention.
FIG. 2 is a partial cross-sectional view showing a construction procedure subsequent to FIG.
FIG. 3 is a partial cross-sectional view for explaining a conventional construction procedure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid barrier 1a Steel material 2 Inner tank 4 Roof structure 4a Roof board 4b Roof bone 6 Support metal fitting 10 Locking metal fittings

Claims (2)

コンクリート側壁の頂部内側近傍に屋根係止金具を埋込んだ状態でコンクリートを打設することにより該コンクリート側壁を完成させる工程と、
底版上で屋根構造体を組立てた後、該屋根構造体を前記コンクリート側壁の頂部まで浮上させ、その屋根骨を前記係止金具に位置決め当接させる工程と
前記屋根構造体と前記コンクリート側壁の頂部との間に支持金物を跨らせて、前記屋根構造体と前記係止金具との間を前記支持金物を介して溶接により固定するとともに、前記支持金物を前記コンクリート側壁の頂部に固定する工程と
前記コンクリート側壁頂部と前記屋根構造体の端部に前記支持金物を埋設する状態でコンクリートを打設し、屋根を一体化したタンク外槽部を完成させる工程とを具備したことを特徴とするタンクの屋根固定方法。
A step of completing the concrete side wall by placing concrete in a state where a roof locking bracket is embedded in the vicinity of the inside of the top of the concrete side wall;
After assembling the roof structure on the bottom plate, and floated the roof structure to the top of the concrete sidewalls, Ru and the roof bone is positioning contact with the locking fitting step,
A support metal is straddled between the roof structure and the top of the concrete side wall, and the space between the roof structure and the locking metal fitting is fixed by welding via the support metal, and the support metal Fixing to the top of the concrete side wall ;
A tank comprising: placing concrete in a state where the supporting metal is embedded in the concrete side wall top and the end of the roof structure, and completing a tank outer tub unit integrated with the roof. Roof fixing method.
前記支持金物を、前記コンクリート側壁の頂部に埋設させたアンカーに係止部材を用いて固定することを特徴とする請求項1に記載のタンクの屋根固定方法。2. The tank roof fixing method according to claim 1, wherein the supporting hardware is fixed to an anchor embedded in a top portion of the concrete side wall using a locking member.
JP2001157320A 2001-05-25 2001-05-25 Tank roof fixing method Expired - Lifetime JP3864062B2 (en)

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JP2001157320A JP3864062B2 (en) 2001-05-25 2001-05-25 Tank roof fixing method

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JP3864062B2 true JP3864062B2 (en) 2006-12-27

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