JP3884230B2

JP3884230B2 - Steel tank consisting of vertical panels and its construction method

Info

Publication number: JP3884230B2
Application number: JP2000381972A
Authority: JP
Inventors: 伸浩北原; 明宮本; 裕樹伊沢; 周作川口
Original assignee: Nippon Steel Engineering Co Ltd
Current assignee: Nippon Steel Engineering Co Ltd
Priority date: 2000-12-15
Filing date: 2000-12-15
Publication date: 2007-02-21
Anticipated expiration: 2020-12-15
Also published as: JP2002179185A

Description

【０００１】
【発明の属する技術分野】
本発明は、上水道、農業用水・工業用水等の液体を貯留する円筒型の鋼製タンクの構造及びその構築方法に関するものである。
【０００２】
【従来の技術】
上水道、農業用水・工業用水等の液体を貯留する大型の円筒型鋼製タンクは、通常、底板、側板で構成されており、農業用水や工業用水の貯水タンクは、屋根なしもあるが、上水道用貯水タンクとして使用されるものは屋根が設けられている。
【０００３】
（従来技術１）
従来の円筒型鋼製タンクの一般的なものは、図１７に示すような鉛直及び周方向を複数に分割した円弧状パネル２０を、版縦方向の溶接先が揃わないようにレンガ積み状に配設して複数段溶接接合して側版を構築した構造のものが多い。
【０００４】
この円筒タンクの構築方法は、底板およびアニュラプレートを配列・溶接後、その外周上に円筒タンクの完成形の曲率で曲形成した円弧状パネル２０を数段にわたりレンガ積み状（千鳥状）に配列・溶接して行なわれる。この従来法は、円弧状パネル数が多く、しかも現地溶接箇所数が多いため長い工期を要する課題があった。また、円弧状パネル２０の周方向溶接２１ａと縦方向溶接２１ｂが交差するＴクロス溶接部２２が多数存在し、溶接品質を確保するのが難しい課題があった。
【０００５】
（従来技術２）
また、特開平８−１３３３８４に開示されている鋼製タンクは、図１８に示すように、周方向に適宜間隔を置いて支柱２３を配列し、各支柱２３間に円弧状に湾曲させた金属製の側板パネル２４を固定したものである。この鋼製タンクは、組立て部品数が少なく施工を簡素化するとともに支柱２３の設置によって、タンク側壁の強度を向上させることができるとされている。
【０００６】
【発明が解決しようとする課題】
前記従来技術１は、前述のように長い工期を要すること、溶接品質を確保するのが難しいことに加えて、周方向溶接線２１ａの水平溶接ビード形状が悪いため美観を損なう課題もあった。
【０００７】
また、従来技術２は、側板パネル２４を少なくして現地作業の工期を短縮する事はできるが、タンクの設計において、周方向が剛性の異なる薄板と支柱２３で構成しているため、支柱部にタンクの内水圧による曲げ応力が生じてしまうとともに、屋根部の上載荷重等を剛性の高い支柱２３に負担させることになるため、支柱２３に応力が集中し、断面剛性の高い支柱部材を用いる必要が生じてタンク全体の鋼材重量が大きくなる課題があった。
【０００８】
特にステンレス製のタンクでは、アングルや角パイプからなる支柱材として高価なステンレス材を用いることになるためコスト高になる課題もあった。
【０００９】
また、ステンレス製のタンクでは、溶接部周辺が変色して美観を損なうため、従来は酸洗処理を行っていたが、作業が容易でなく、且つ酸洗処理した廃液処分に困っていた。
【００１０】
本発明は、上記のような従来の課題を解消して、現地作業を容易化して工期短縮を図り、且つ高い溶接品質を確保し、さらに美観に優れた低コストな鋼製タンクの構造とその構築方法を提供することを目的としたものである。
【００１１】
【課題を解決するための手段】
請求項１の縦パネルからなる鋼製タンクにおいては、平板又は湾曲した方形鋼板の下端にアニュラープレート２が溶接により固着され、且つ左右端部の鉛直方向の適宜間隔毎に仮止部材３を設けたプレハブ製作の縦パネル１が円周方向に多数立設され、隣接する縦パネル１、１の左右端部同士が溶接接合され、且つ前記アニュラープレート２が底板７と溶接接合されている縦パネルからなる鋼製タンクであって、鋼製タンクの構成材料がステンレス鋼板であり、各縦パネル１に設けた仮止部材３に縦溶接線９を隠す化粧材６を取付けた。
【００１２】
請求項２の発明においては、請求項１の発明において、前記縦パネル１の上端に沿って屋根材８を固定するトップリング４を溶接した。
【００１３】
請求項３の発明においては、請求項１の発明において、ステンレス鋼板製の鋼製タンクにおいて、周溶接線１０を隠す位置に目隠兼用のウィンドガーダー５を設けた。
【００１４】
請求項４の縦パネルからなる鋼製タンクの構築方法においては、平板又は湾曲した方形鋼板の下端にアニュラープレート２が溶接され、且つ左右端部の鉛直方向の適宜間隔毎に仮止部材３を設けたプレハブ製作の縦パネル１を多数準備しておき、以下（１）〜（５）の手順で順次築造する。
（１）まず、整地・転圧された基礎地盤上にタンクの底板鋼板を並べて溶接接合し、底板７を設置する。
（２）次いで、工場等でプレハブ製作した前記縦パネル１の１枚目を、その左右端部の仮止部材３に仮設補剛材１１を仮止めした状態で吊り上げ、所定位置に立設する。
（３）続いて、２枚目の縦パネル１を、その左右端部の仮止部材３に仮設補剛材１１を仮止めした状態で吊り上げ、既設の縦パネル１に隣接して立設し、仮設補剛材１１を取外して、各縦パネル１の端部の仮止部材３を連結具３ａで連結する。
（４）以下、順次３枚目以降の縦パネル１を、その左右端部の仮止部材３に仮設補剛材１１を仮止めした状態で吊り上げ、既設の縦パネル１に隣接して立設すると共に、架設補剛材１１を取り外して、端部の仮止部材３を連結具３ａで連結し、全ての縦パネル１の仮止部材３を連結した状態で立設を完了する。
（５）次に各縦パネル１の端部同士を溶接し、その後、底板７とアニュラープレート２を溶接する。
【００１５】
請求項５の発明においては、請求項４の鋼製タンクの構築方法における前記タンクの築造手順（５）の後、縦パネル１の左右端部の仮止部材３に化粧材６を取付けて縦溶接線９を隠す手順を加えた。
【００１６】
請求項６の発明においては、請求項４または請求項５の鋼製タンクの構築方法における縦パネルに代えて、タンク設置場所の地上にて、プレハブ製作した前記縦パネル１を複数枚溶接接合して大ブロック化した縦パネルを、吊り上げ立設して築造する。
【００１７】
（発明のポイント）
本発明は、現地組立てのパネル数を少なくして作業量を軽減するために周方向を多数に分割した縦パネル１を溶接接合して円筒タンクを構築することとした。また、タンクを構成するパネルを縦パネル１としているため現地において周方向の横向き溶接作業をなくし、溶接品質確保が難しいＴクロス溶接部２２が生じないようにし、且つ美観の悪い水平溶接ビードの形成をなくした。
【００１８】
タンクの側板は縦パネル１の端部を突合せ溶接して均一厚さのリング状にしているため、前記従来技術（２）におけるような支柱部に生じる集中応力の問題がない。
【００１９】
なお、後述するステンレス製タンクにおいて、現地溶接部を隠すように化粧材６を設けたものは、溶接部の美観を目的としたもので、仮止部材３に剛性の小さい断面コの字状の化粧材６を数カ所連結具３ａで固定している程度であるため、前記従来技術（２）における支柱２３とは異なり、タンク側板の圧縮・曲げ剛性に変化を与えるものではない。
【００２０】
また、縦パネル１は、アニュラープレート２や目隠し兼用ウィンドガーダー５を工場等で溶接したプレハブ製作としているため、高い応力が生じる側板とアニュラプレートの溶接部を容易に高品質で溶接できることとした。また、縦パネル１の上端にトップリング４をプレハブ溶接したものは、屋根付きタンクにおいて、現地におけるトップリング４の上向き溶接作業を回避して、溶接作業の容易化と品質確保を図ることができる。
【００２１】
また、縦パネル１の左右端部に設けた仮止部材３によって、タンク築造時の仮付溶接を省くことができ、縦パネル組立て作業を容易にして作業効率を向上させた。
縦パネル１を現地にて複数接合して大ブロック化すれば、さらに作業効率を高めることができる。また、タンク材料としてステンレスを用いた鋼製タンクにおいて、前記仮止部材３を利用して現地（場）溶接部を隠すように化粧材６を設けたものは、ステンレス溶接部周辺の変色外観不良を隠して、タンク全体をステンレスの光沢とし、美観を呈する事が出来る。また、ステンレス溶接部の酸洗処理を行なう場合の廃液処分の問題を解消できる。
【００２２】
【発明の実施の形態】
図１および図２は、本発明をステンレス材を用いた上水道用の屋根付きの貯水タンクに適用した実施形態の一部横断平面図と側面図である。図３はタンクを構成する状態の縦パネルの断面図、図４は縦パネルの斜視図である。
【００２３】
本発明の鋼製タンクは、図１および図２に示すように、周方向をトラックやトレーラー等で運搬可能な大きさに分割した湾曲した方形鋼板からなる多数の縦パネル１を、円形状に溶接接合して側板（周側板）が形成され、各縦パネル１の下端に工場等でプレハブ溶接されたアニュラープレート２が底板７に溶接により接合されて構築されている。また、タンク側板の縦パネル溶接部外周には、縦溶接線９に沿って固定されたボルト孔付の仮止部材３に、断面コの字状の化粧材６が取付けられており、側板上部のステンレス板相互の周溶接線１０に沿って周方向に溝型の目隠し材兼用ウインドガーダー５が溶接固定されている。さらに、タンク上には屋根骨８ａと屋根板８ｂからなるドーム状屋根材８が設置されている。
【００２４】
図３は縦パネル１を溶接接合して形成した側板の一部を切り出した横断面図であって、隣接する縦パネル１の左右端部およびアニュラープレート２が突合わせ溶接され、アニュラープレート２は底板７に重ね溶接されている。縦パネル１の左右端溶接部９の外側には、ウインドガーダー嵌設用凹部６ａを備えた断面コの字状の化粧材６がボルト連結具３ａによって仮止部材３に固定されている。
【００２５】
図４は本発明に係る縦パネル１の斜視図である。縦パネル１は可搬可能な大きさに分割されたタンク曲率に合わせて湾曲した方形鋼板で下端にアニュラープレート２が溶接により固着され、左右端部には鉛直方向に間隔をおいて仮止部材３が溶接により固定されている。また、パネル上部のステンレスの周溶接線１０に沿って溝型の目隠し材兼用ウインドガーダー５が溶接固定されている。さらに、パネル上端に沿って屋根材を支える所定幅のトップリング４が溶接されている。
【００２６】
この縦パネル１は、工場や現地の製作ヤードでプレハブ製作される。特に縦パネル下端のアニュラープレート２の固定部は、最も応力が集中する部分であるため、十分な品質管理のもとで製作容易プレハブ製作としたほうが有利となる。また、トップリング４を立設状態で現地溶接（現場溶接）するには、上向き溶接となり溶接作業が困難で品質確保が難しくなる問題も解消できる。
【００２７】
左右端部に設けた仮止部材３は、タンク築造時に縦パネル１を立設保持する際の仮止め、およびステンレス溶接線周辺を隠す化粧材６の取付け部材として用いられる。また、縦パネルの立設施工時の変形を防止するための仮設補剛材１１を取付ける部材として利用することもできる。６は仮止部材３に取付けられる縦溶接線９を隠す断面コの字状のボルト挿通孔付化粧材６である。
【００２８】
図５は縦パネル左右端を溶接した縦溶接線９に沿って溶接による変色域を隠す化粧材６の取付け断面図である。９ａは突合せ溶接時の裏当て材であって、設けない場合もある。
【００２９】
また、図６はパネル上部のステンレスの周溶接線１０に沿って溶接固定されている溝型の目隠し材兼用ウインドガーダー５を示す図で、図７は目隠し材兼用ウインドガーダー５と前記化粧材６との交差部を示すものである。
【００３０】
なお、溶接線９，１０の目隠し用化粧材６および目隠し材兼用ウインドガーダー５の内部は、溶接部周辺に塗装したり、剛性を高めない程度の軟らかい充填材、例えば発泡ウレタンや発泡モルタル等を充填して耐食性を確保するようにしてもよい。
【００３１】
上記実施形態は、屋根付きの円筒タンクを示したが、屋根なしに適用することもできる。この場合は、トップリング４は不要となる。また、タンク材料として普通鋼板を使用し塗装する場合は、溶接線９の目隠し用化粧材６は不要となり、仮止部材３は、タンク構築時の縦パネル１仮止め、または縦パネル１を吊上げ時の仮設補剛材１１の固定部材として使用することになる。
【００３２】
図８〜図１２は、本発明に係る鋼製タンクの構築方法の手順を示す斜視図であり、図１３（ａ）〜（ｅ）はタンク構築途中の縦パネル端溶接接合部の断面図である。
【００３３】
本発明の鋼製タンクの築造は、以下の（１）〜（７）の手順で順次行なう。
（１）まず、整地・転圧された基礎地盤上にタンクの底板鋼板を並べて溶接接合し、底板７を設置する。工場等でプレハブ製作した前記縦パネル１を搬入しておく。この際、縦パネル１を底板７上に花びら状（放射状）に展開して配置しておくと、縦パネル１の立設作業を容易にできる。
【００３４】
（２）次に、現地に搬入されている前記縦パネル１の1枚目を、その左右端部の仮止部材３に変形防止用の仮設補剛材１１の一端側をボルト・ナット等の固定具３ｂで仮止めした状態で吊り上げ、所定位置に立設する。（図８参照）
【００３５】
前記仮設補剛材１１は、図１４のように、溶接部を目隠しする化粧材６を兼用して、その一側面板１１ａの内面を縦パネル１に設けた仮止部材３の外面に当接して固定具３ｂで固定するか、または図１５のような縦パネル１に間隔をおいて設けられた仮止部材３のピッチにボルト孔を設けたＬ型鋼等を使用する。
【００３６】
（３）２枚目の縦パネル端を、その左右端部の仮止部材３に変形防止用の仮設補剛材１１の一端側をボルト・ナット等の固定具３ｂで仮止めした状態で吊り上げ、既設の縦パネル端に隣接して立設し、仮設補剛材１１を取外して縦パネル１の端部を突き合わせて仮止部材３をボルトナット等の連結具３ａで連結する。（図９参照）、（図１３ａ，図１３ｂ参照）
【００３７】
（４）以下、順次３枚目以降の縦パネル１を、その左右端部の仮止部材３に変形防止用の仮設補剛材１１の一端側をボルト・ナット等の固定具３ｂで仮止めした状態で吊り上げ、既設の縦パネル端に隣接して立設し、仮設補剛材１１を取外して、周方向に隣り合う縦パネル１の端部の仮止部材３相互を連結具３ａで連結し、全ての縦パネル１を仮止部材３を連結した状態で立設完了する。（図１０参照）、（図１３ｂ参照）
【００３８】
（５）次に各縦パネル１の突合わせ端部を溶接し、その後、隣接するアニュラープレート２同士を溶接し、その後アニュラープレート２と底板７を重ね溶接する。なお、縦パネル１にウィンドガーダー５を備えたものは、図１６の如く隣接する縦パネル１のウィンドガーダー５の端部との間に、前記ウィンドガーダー５と同じ断面形状で裏当て金用切り欠き部を備えた接合片５ａを挟み込んで溶接接合する。（図１０参照）、（図１３ｃ参照）
【００３９】
普通鋼を用いた屋根なしの塗装タンクの場合は、仮止部材３を切断撤去した後、塗装を施し完成する。
【００４０】
（６）ステンレス材を用いたタンクの場合は、仮止部材３を連結した連結具３ａを一旦取り外した後、化粧材６を対向する仮止部材３を囲むようにセットして、仮止部材３に、前記化粧材６と前記各仮止部材３の透孔に挿通したボルト・ナット等の連結具３ａで固定する。（図１１参照）、（図１３ｄ、図１３ｅ参照）
【００４１】
（７）屋根突きタンクの場合は、屋根材８を設置する。
図１２、図１３ｅは完成状態のタンク側板の一部切取り斜視図および化粧材取付け断面図である。
【００４２】
なお、前記（２）（３）の手順において、プレハブ製作した前記縦パネル１をタンク設置場所の地上にて複数枚溶接接合して大ブロック化したものを、吊り上げて立設するようにしてもよい。
【００４３】
【発明の効果】
本発明は以下のような効果を奏する。
（１）本発明は、プレハブ製作の縦パネルを用いて鋼製タンクを構築するため、現地組立てのパネル数を少なくして作業量を軽減できる。また、周方向の横向き溶接作業をなくし、溶接品質確保が難しいＴクロス溶接部が生じないようにし、且つ美観の悪い水平溶接ビードの形成をなくした。
【００４４】
（２）タンクの側板は、縦パネル端部を突合せ溶接して均一厚さのリング状にしたものとしているため、前記従来技術（２）における支柱部の集中応力発生の問題がない。
【００４５】
（３）また、縦パネルはアニュラープレートやウィンドガーダーを工場等で溶接したプレハブ製作としているため、高い応力が生じる側板とアニュラプレートの溶接部を容易に高品質で溶接できる。また、縦パネルの上端にトップリングをプレハブ溶接したものは、屋根付きタンクにおいて現地におけるトップリングの上向き溶接作業を回避して、溶接作業の容易化と品質確保を図ることができる。
【００４６】
（４）また、縦パネルの左右端部に設けた仮止部材によって、タンク築造時の仮付溶接を省くことができ、縦パネル組立て作業を容易にして作業効率を向上させることができる。
【００４７】
（５）さらに、縦パネルを現地にて複数接合して大ブロック化すればさらに作業効率を高めることができる。また、タンク材料としてステンレスを用いた鋼製タンクにおいて、前記仮止部材を利用して現地溶接部を隠すように化粧材を設けたものは、ステンレス溶接部周辺の変色外観不良を隠してタンク全体をステンレスの光沢とし、美観を呈する事が出来る。またステンレス溶接部の酸洗処理を行なう場合の廃液処分の問題を解消できる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るステンレス材を用いた屋根付き鋼製タンクの一部横断平面である。
【図２】図１に示すタンクの側面図である。
【図３】縦パネルを溶接接合した一部断面図である。
【図４】本発明に係る縦パネルの斜視図である。
【図５】化粧材を取付けた横断面図である。
【図６】溶接部目隠し兼用ウインドガーダーを取り付けた断面図である。
【図７】溶接部目隠し兼用ウインドガーダーと化粧材交差部を示す断面図である。
【図８】本発明の鋼製タンク構築方法の手順例である。
【図９】本発明の鋼製タンク構築方法の手順例である。
【図１０】本発明の鋼製タンク構築方法の手順例である。
【図１１】本発明の鋼製タンク構築方法の手順例である。
【図１２】本発明の鋼製タンク構築方法の手順例である。
【図１３】（ａ）〜（ｅ）本発明の鋼製タンク構築方法の手順における縦パネル溶接部断面図である。
【図１４】縦パネルの立設時使用する変形防止用仮設補剛材（化粧材兼用）である。
【図１５】縦パネルの立設時使用する変形防止用仮設補剛材（Ｌ型鋼）である。
【図１６】ウィンドガーダー接合図である。
【図１７】従来例１の鋼製タンク斜視図である。
【図１８】従来例２の鋼製タンク斜視図である。
【符号の説明】
１縦パネル
２アニュラープレート
３仮止部材
３ａ連結具（ボルトナット）
３ｂ固定具（ボルトナット）
４トップリング
５目隠し兼用ウィンドガーダー
５ａ接合片
６化粧材
７底板
８屋根材
８ａ屋根骨
８ｂ屋根板
９縦溶接線
９ａ裏当て材
１０周溶接線
１１仮設補剛材
２０円弧状パネル
２１周方向溶接線
２２Ｔクロス溶接部
２３支柱
２４側板パネル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylindrical steel tank structure for storing liquids such as waterworks, agricultural water and industrial water, and a construction method thereof.
[0002]
[Prior art]
Large cylindrical steel tanks that store liquids such as waterworks, agricultural water, industrial water, etc. are usually composed of a bottom plate and side plates. Agricultural water and industrial water storage tanks may have no roof. Those used as water storage tanks have a roof.
[0003]
(Prior art 1)
A conventional cylindrical steel tank is generally made of a circular arc panel 20 divided into a plurality of vertical and circumferential directions as shown in FIG. 17 in a brick shape so that the welding points in the plate longitudinal direction are not aligned. Many of them have a structure in which a side plate is constructed by arranging and welding in a plurality of stages.
[0004]
In this cylindrical tank construction method, after arranging and welding the bottom plate and the annular plate, the arc-shaped panels 20 formed with the curvature of the cylindrical tank on the outer periphery thereof are arranged in a brick stack (staggered) over several stages.・ It is done by welding. This conventional method has a problem that a long construction period is required because the number of arc-shaped panels is large and the number of on-site welding points is large. In addition, there are many T-cross welds 22 where the circumferential weld 21a and the longitudinal weld 21b of the arc-shaped panel 20 intersect, and there is a problem that it is difficult to ensure the welding quality.
[0005]
(Prior art 2)
Further, as shown in FIG. 18, the steel tank disclosed in Japanese Patent Laid-Open No. 8-133384 is a metal in which struts 23 are arranged at appropriate intervals in the circumferential direction and curved in a circular arc shape between the struts 23. A side plate panel 24 made of metal is fixed. In this steel tank, the number of assembled parts is small, the construction is simplified, and the strength of the tank side wall can be improved by the installation of the support columns 23.
[0006]
[Problems to be solved by the invention]
In the prior art 1, as described above, a long construction period is required and it is difficult to ensure the welding quality. In addition, the horizontal weld bead shape of the circumferential weld line 21a is poor, and there is a problem of deteriorating the appearance.
[0007]
Moreover, although the prior art 2 can shorten the work period of field work by reducing the side panel 24, in the tank design, since the circumferential direction is comprised of the thin plate and the column 23 having different rigidity, the column unit In addition, a bending stress due to the internal water pressure of the tank is generated, and an upper load or the like of the roof portion is borne by the highly rigid support column 23. Therefore, the stress is concentrated on the support column 23, and a support member having a high cross-sectional rigidity is used. There was a problem that the steel material weight of the whole tank became large due to necessity.
[0008]
In particular, in the case of a stainless steel tank, an expensive stainless steel material is used as a support material made of an angle or a square pipe.
[ 0009 ]
In addition, in a stainless steel tank, the periphery of the welded portion is discolored and the aesthetic appearance is impaired, so that pickling treatment has been conventionally performed. However, the operation is not easy, and disposal of the waste liquid subjected to pickling treatment has been troubled.
[ 0010 ]
The present invention eliminates the conventional problems as described above, facilitates on-site work, shortens the work period, secures high welding quality, and further has a low-cost steel tank structure with excellent aesthetics and its structure. The purpose is to provide a construction method.
[ 0011 ]
[Means for Solving the Problems]
In the steel tank comprising the vertical panel according to claim 1, the annular plate 2 is fixed to the lower end of a flat plate or a curved rectangular steel plate by welding, and provisional fixing members 3 are provided at appropriate intervals in the vertical direction of the left and right end portions. A plurality of vertical panels 1 made of prefabricated products are erected in the circumferential direction, and the left and right ends of adjacent vertical panels 1 and 1 are welded together, and the annular plate 2 is welded and joined to the bottom plate 7. The structural material of the steel tank is a stainless steel plate, and a decorative material 6 for hiding the vertical welding line 9 is attached to the temporary fixing member 3 provided on each vertical panel 1 .
[0012]
In the invention of claim 2, in the invention of claim 1, the top ring 4 for fixing the roofing material 8 along the upper end of the vertical panel 1 is welded.
[0013]
In the invention of claim 3, in the invention of claim 1 , in the steel tank made of stainless steel plate, the window guard 5 serving both as a blindfold is provided at a position where the circumferential weld line 10 is hidden.
[0014]
In the construction method of the steel tank which consists of the vertical panel of Claim 4 , the annular plate 2 is welded to the lower end of a flat plate or the curved square steel plate, and the temporary fixing member 3 is attached for every appropriate space | interval of the right-and-left end part. A large number of prefabricated vertical panels 1 are prepared, and are sequentially constructed in the following procedures (1) to (5) .
(1) First, the bottom plate steel plates of the tank are arranged and welded together on the ground that has been leveled and rolled, and the bottom plate 7 is installed.
(2) Next, the first panel of the vertical panel 1 prefabricated at a factory or the like is lifted with the temporary stiffener 11 temporarily fixed to the temporary fixing members 3 at the left and right ends thereof, and is erected at a predetermined position. .
(3) Subsequently, the second vertical panel 1 is lifted in a state where the temporary stiffener 11 is temporarily fixed to the temporary fixing members 3 at the left and right end portions thereof , and is erected adjacent to the existing vertical panel 1. Then, the temporary stiffener 11 is removed, and the temporary fixing member 3 at the end of each vertical panel 1 is connected by the connector 3a.
(4) Hereinafter, the third and subsequent vertical panels 1 are lifted in a state where the temporary stiffener 11 is temporarily fixed to the temporary fixing members 3 at the left and right end portions thereof, and are erected adjacent to the existing vertical panel 1. At the same time, the erection stiffener 11 is removed , the temporary fixing member 3 at the end is connected by the connector 3a, and the standing installation is completed in a state where the temporary fixing members 3 of all the vertical panels 1 are connected.
(5) Next, the end portions of the vertical panels 1 are welded together, and then the bottom plate 7 and the annular plate 2 are welded .
[0015]
Vertical In the invention of claim 5, after the construction procedure of the tank in a method for constructing a steel tank of claim 4 (5), the temporary fixing member 3 of the right and left ends of the vertical panel 1 is attached a decorative material 6 A procedure for hiding the weld line 9 was added.
[0016]
In the invention of claim 6 , in place of the vertical panel in the steel tank construction method of claim 4 or 5, a plurality of the prefabricated vertical panels 1 are welded and joined on the ground of the tank installation site. A large vertical panel is lifted and built up.
[0017]
(Point of invention)
In the present invention, in order to reduce the number of panels assembled in the field and reduce the amount of work, the cylindrical panel is constructed by welding and joining the vertical panels 1 having a large number of circumferential directions. In addition, since the panel constituting the tank is the vertical panel 1, the horizontal welding work in the circumferential direction is eliminated at the site, the T-cross welded portion 22, which is difficult to ensure the welding quality, is not formed, and the formation of a poorly welded horizontal welding bead is formed. Lost.
[0018]
Since the side plate of the tank is butt welded to the end portion of the vertical panel 1 to form a ring with a uniform thickness, there is no problem of concentrated stress generated in the column portion as in the prior art (2).
[0019]
In addition, in the stainless steel tank to be described later, the one provided with the decorative material 6 so as to conceal the welded part on the site is for the purpose of aesthetic appearance of the welded part, and the temporary fixing member 3 has a U-shaped section with small rigidity. Since the decorative material 6 is fixed to several places by the coupler 3a, unlike the support 23 in the prior art (2), the compression / bending rigidity of the tank side plate is not changed.
[0020]
Further, since the vertical panel 1 is prefabricated by welding the annular plate 2 and the blindfolded window girder 5 at a factory or the like, the welded portion of the side plate and the annular plate where high stress is generated can be easily welded with high quality. Moreover, the thing which prefabricated the top ring 4 to the upper end of the vertical panel 1 can avoid the upward welding work of the top ring 4 in the field in a roofed tank, and can aim at the ease of welding work and quality assurance. .
[0021]
Further, the temporary fixing members 3 provided at the left and right end portions of the vertical panel 1 can eliminate the temporary welding at the time of tank construction, thereby facilitating the vertical panel assembling work and improving the working efficiency.
If a plurality of vertical panels 1 are joined on site to make a large block, work efficiency can be further increased. Further, in a steel tank using stainless steel as a tank material, a discoloration appearance defect around the stainless steel welded portion is provided with the decorative material 6 so as to conceal the local (field) welded portion using the temporary fixing member 3. The entire tank is made of stainless steel and can be aesthetically pleasing. Moreover, the problem of waste liquid disposal in the case of pickling the stainless steel weld can be solved.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 are a partial cross-sectional plan view and a side view of an embodiment in which the present invention is applied to a water storage tank with a roof for waterworks using a stainless steel material. FIG. 3 is a cross-sectional view of the vertical panel in a state constituting the tank, and FIG. 4 is a perspective view of the vertical panel.
[0023]
As shown in FIG. 1 and FIG. 2, the steel tank of the present invention has a large number of vertical panels 1 made of a curved rectangular steel plate having a circumferential direction divided into a size that can be transported by a truck, a trailer or the like. A side plate (circumferential side plate) is formed by welding and an annular plate 2 prefabricated at the lower end of each vertical panel 1 at a factory or the like is joined to the bottom plate 7 by welding. Further, on the outer periphery of the welded portion of the vertical side panel of the tank side plate, a decorative material 6 having a U-shaped cross section is attached to a temporary fixing member 3 with a bolt hole fixed along the vertical weld line 9. A groove-shaped blindfolding window guarder 5 serving as a blindfold is welded and fixed along the circumferential weld line 10 between the stainless steel plates in the circumferential direction. Further, a dome-shaped roof material 8 comprising a roof bone 8a and a roof plate 8b is installed on the tank.
[0024]
FIG. 3 is a cross-sectional view in which a part of a side plate formed by welding the vertical panel 1 is cut out. The left and right ends of the adjacent vertical panels 1 and the annular plate 2 are butt welded, and the annular plate 2 is It is lap welded to the bottom plate 7. On the outside of the left and right end welds 9 of the vertical panel 1, a U-shaped decorative material 6 having a wind girder fitting recess 6a is fixed to the temporary fixing member 3 by a bolt connector 3a.
[0025]
FIG. 4 is a perspective view of the vertical panel 1 according to the present invention. The vertical panel 1 is a rectangular steel plate curved in accordance with the tank curvature divided into a portable size, and an annular plate 2 is fixed to the lower end by welding, and a temporary fixing member with a space in the vertical direction at the left and right ends. 3 is fixed by welding. Further, a groove-type blindfolder combined window girder 5 is welded and fixed along a stainless steel circumferential weld line 10 at the top of the panel. Further, a top ring 4 having a predetermined width for supporting the roof material is welded along the upper end of the panel.
[0026]
This vertical panel 1 is prefabricated in a factory or a local production yard. In particular, since the fixed portion of the annular plate 2 at the lower end of the vertical panel is a portion where stress is most concentrated, it is more advantageous to make prefabrication easy to manufacture under sufficient quality control. In addition, in-situ welding (on-site welding) with the top ring 4 in an upright state, it is possible to solve the problem that the welding becomes upward and the welding work is difficult and the quality is difficult to ensure.
[0027]
The temporary fixing members 3 provided at the left and right end portions are used as temporary fixing members for standing and holding the vertical panel 1 when the tank is constructed, and as attachment members for the decorative material 6 that hides the periphery of the stainless steel weld line. Moreover, it can also utilize as a member which attaches the temporary stiffener 11 for preventing the deformation | transformation at the time of standing installation of a vertical panel. Reference numeral 6 denotes a decorative material 6 with a bolt insertion hole having a U-shaped cross section that hides the longitudinal weld line 9 attached to the temporary fixing member 3.
[0028]
FIG. 5 is an attachment cross-sectional view of the decorative material 6 that hides the discoloration region by welding along the vertical welding line 9 where the left and right ends of the vertical panel are welded. 9a is a backing material at the time of butt welding, and may not be provided.
[0029]
FIG. 6 is a view showing a groove type blindfolder window guarder 5 which is welded and fixed along a stainless steel peripheral weld line 10 at the upper part of the panel. FIG. It shows the crossing part.
[0030]
The interior of the blindfolding decorative material 6 and the blindfolding window girder 5 on the weld lines 9 and 10 is coated with a soft filler, such as foamed urethane or foamed mortar, which does not increase the rigidity of the welded portion and the window guarder combined with the blindfold. It may be filled to ensure corrosion resistance.
[0031]
Although the above embodiment shows a cylindrical tank with a roof, it can also be applied without a roof. In this case, the top ring 4 is not necessary. Moreover, when painting using a normal steel plate as a tank material, the covering material 6 for blindfolding the weld line 9 is not necessary, and the temporary fixing member 3 is used to temporarily hold the vertical panel 1 or the vertical panel 1 when the tank is constructed. It will be used as a fixing member for the temporary stiffener 11 at the time.
[0032]
FIGS. 8-12 is a perspective view which shows the procedure of the construction method of the steel tank which concerns on this invention, FIG.13 (a)-(e) is sectional drawing of the vertical panel end weld joint part in the middle of tank construction. is there.
[0033]
The construction of the steel tank of the present invention is sequentially performed by the following procedures (1) to (7).
(1) First, the bottom plate steel plates of the tank are arranged and welded together on the ground that has been leveled and rolled, and the bottom plate 7 is installed. The vertical panel 1 prefabricated at a factory or the like is carried in. At this time, if the vertical panel 1 is developed and arranged in a petal shape (radial shape) on the bottom plate 7, the vertical panel 1 can be easily erected.
[0034]
(2) Next, the first sheet of the vertical panel 1 carried in the field is attached to the temporary fixing member 3 at the left and right ends thereof with one end of the temporary stiffener 11 for preventing deformation such as bolts and nuts. It is lifted in a state where it is temporarily fixed by the fixture 3b, and is erected at a predetermined position. (See Figure 8)
[0035]
As shown in FIG. 14, the temporary stiffener 11 also serves as a decorative material 6 that blinds the welded portion, and the inner surface of one side plate 11 a abuts against the outer surface of the temporary fixing member 3 provided on the vertical panel 1. The fixing tool 3b is used, or L-shaped steel or the like in which bolt holes are provided in the pitch of the temporary fixing members 3 provided at intervals in the vertical panel 1 as shown in FIG.
[0036]
(3) The second vertical panel end is lifted in a state in which one end side of the temporary stiffening material 11 for preventing deformation is temporarily fixed to the temporary fixing member 3 at the left and right end portions thereof by a fixture 3b such as a bolt and a nut. Then, it is erected adjacent to the end of the existing vertical panel, the temporary stiffener 11 is removed, the end of the vertical panel 1 is abutted, and the temporary fixing member 3 is connected by a connector 3a such as a bolt and nut. (See FIG. 9), (See FIGS. 13a and 13b)
[0037]
(4) Hereinafter, the third and subsequent vertical panels 1 are temporarily fixed to the temporary fixing members 3 at the left and right ends by temporarily fixing one end side of the temporary stiffener 11 for preventing deformation with a fixture 3b such as a bolt or a nut. In this state, it is lifted up, is erected adjacent to the end of the existing vertical panel , the temporary stiffener 11 is removed , and the temporary fixing members 3 at the ends of the vertical panels 1 adjacent in the circumferential direction are connected to each other by a connector 3a. Then, all the vertical panels 1 are erected in a state where the temporary fixing members 3 are connected. (See FIG. 10), (See FIG. 13b)
[0038]
(5) Next, the butted ends of each vertical panel 1 are welded, then the adjacent annular plates 2 are welded together, and then the annular plate 2 and the bottom plate 7 are welded together. When the vertical panel 1 is provided with the wind girder 5, as shown in FIG. 16, the cutting plate for the backing metal having the same cross-sectional shape as that of the wind girder 5 is provided between the end portions of the adjacent vertical panel 1 of the wind girder 5. The joining piece 5a provided with the notch is sandwiched and welded. (See FIG. 10), (See FIG. 13c)
[0039]
In the case of a paint tank without roof using ordinary steel, the temporary fixing member 3 is cut and removed, and then painted to complete.
[0040]
(6) In the case of a tank using a stainless material, after temporarily removing the connector 3a connected to the temporary fixing member 3, the decorative material 6 is set so as to surround the opposing temporary fixing member 3, and the temporary fixing member 3 is fixed by a connecting tool 3a such as a bolt and a nut inserted through the through hole of the decorative material 6 and each temporary fixing member 3. (See FIG. 11), (See FIGS. 13d and 13e)
[0041]
(7) In the case of a roof butt tank, the roof material 8 is installed.
12 and 13e are a partially cutaway perspective view and a decorative material mounting sectional view of the tank side plate in a completed state.
[0042]
In the steps (2) and (3), a large block obtained by welding and joining a plurality of the prefabricated vertical panels 1 on the ground of the tank installation site may be lifted and erected. Good.
[0043]
【The invention's effect】
The present invention has the following effects.
(1) Since this invention constructs a steel tank using the vertical panel of prefabricated manufacture, it can reduce the work amount by reducing the number of panels assembled on site. Further, the lateral welding operation in the circumferential direction is eliminated, the T-cross welded portion, which is difficult to ensure the welding quality, is not generated, and the formation of the poorly welded horizontal weld bead is eliminated.
[0044]
(2) Since the side plate of the tank is formed in a ring shape having a uniform thickness by butt welding the end portions of the vertical panel, there is no problem of the concentrated stress generation of the support column in the prior art (2).
[0045]
(3) Further , since the vertical panel is prefabricated by welding an annular plate or a wind girder at a factory or the like, the welded portion between the side plate where the high stress is generated and the annular plate can be easily welded with high quality. In addition, in the case where the top ring is prefabricated to the upper end of the vertical panel, it is possible to avoid the upward welding work of the top ring in the field in the covered tank, and to facilitate the welding work and ensure the quality.
[0046]
(4) Further , the temporary fixing members provided at the left and right end portions of the vertical panel can eliminate the temporary welding at the time of tank construction, thereby facilitating the vertical panel assembling work and improving the working efficiency.
[0047]
(5) Further, if a plurality of vertical panels are joined locally to make a large block, the working efficiency can be further increased. In addition, in a steel tank using stainless steel as the tank material, a decorative material provided so as to hide the welded part on the spot using the temporary fixing member hides the discoloration appearance defect around the stainless steel welded part. Can be made of stainless steel and can have a beautiful appearance. Moreover, the problem of disposal of waste liquid when performing pickling treatment of stainless steel welds can be solved.
[Brief description of the drawings]
FIG. 1 is a partially transverse plane of a steel tank with a roof using a stainless material according to an embodiment of the present invention.
FIG. 2 is a side view of the tank shown in FIG.
FIG. 3 is a partial cross-sectional view in which vertical panels are joined by welding.
FIG. 4 is a perspective view of a vertical panel according to the present invention.
FIG. 5 is a cross-sectional view with a decorative material attached.
FIG. 6 is a cross-sectional view of a welded blindfolding window girder attached.
FIG. 7 is a cross-sectional view showing a welded part blindfolding window guarder and a decorative material crossing part.
FIG. 8 is a procedure example of the steel tank construction method of the present invention.
FIG. 9 is a procedure example of the steel tank construction method of the present invention.
FIG. 10 is a procedure example of the steel tank construction method of the present invention.
FIG. 11 is a procedure example of the steel tank construction method of the present invention.
FIG. 12 is a procedure example of the steel tank construction method of the present invention.
FIGS. 13A to 13E are cross-sectional views of vertical panel welds in the procedure of the steel tank construction method of the present invention.
FIG. 14 is a temporary stiffener for deformation prevention (also used as a decorative material) used when a vertical panel is erected.
FIG. 15 is a temporary stiffener (L-shaped steel) for preventing deformation used when a vertical panel is erected.
FIG. 16 is a joint view of a wind girder.
17 is a perspective view of a steel tank of Conventional Example 1. FIG.
FIG. 18 is a perspective view of a steel tank of Conventional Example 2.
[Explanation of symbols]
1 Vertical Panel 2 Annular Plate 3 Temporary Fixing Member 3a Connecting Tool (Bolt / Nut)
3b Fixing tool (bolt nut)
4 Top Ring 5 Blindfolded Window Girder 5a Joint 6 Dressing Material 7 Bottom Plate 8 Roof Material 8a Roof Bone 8b Roof Plate 9 Vertical Welding Line 9a Backing Material 10 Circumferential Welding Line 11 Temporary Stiffener 20 Arc-shaped Panel 21 Circumferential Welding Wire 22 T-cross weld 23 Strut 24 Side panel

Claims

An annular plate is fixed to the lower end of a flat plate or a curved rectangular steel plate by welding, and a number of prefabricated vertical panels provided with temporary fixing members at appropriate intervals in the vertical direction of the left and right ends are erected in the circumferential direction. The left and right ends of adjacent vertical panels are welded together, and the annular plate is a steel tank composed of a vertical panel welded to the bottom plate, and the constituent material of the steel tank is a stainless steel plate, A steel tank comprising a vertical panel, wherein a decorative material for hiding the vertical welding line is attached to a temporary fixing member provided on the vertical panel.

2. A steel tank comprising a vertical panel according to claim 1, wherein a top ring for fixing the roof material is fixed to the vertical panel by welding along the upper end thereof.

Steel tanks made of vertical panels of claim 1, wherein the circumferentially weld line eyes hidden combined wind girder is provided.

A large number of prefabricated vertical panels are prepared in which an annular plate is welded to the lower end of a flat plate or a curved rectangular steel plate, and temporary fixing members are provided at appropriate intervals in the vertical direction of the left and right ends. A method for constructing a steel tank comprising a vertical panel, wherein the construction is performed according to the procedure of (5).
(1) The bottom plate steel plate of the tank is lined up and welded on the ground foundation that has been leveled and rolled, and the bottom plate is installed.
(2) The first vertical panel manufactured prefabricated at a factory or the like is lifted in a state where a temporary stiffener is temporarily fixed to a temporary fixing member at its left and right ends, and is erected at a predetermined position.
(3) The second vertical panel is lifted with the temporary stiffeners temporarily fixed to the temporary fixing members at the left and right end portions thereof, is erected adjacent to the existing vertical panels, and the temporary stiffeners are removed. Then, the temporary fixing members at the ends of the vertical panels are connected to each other with a connector.
(4) Hereinafter, the third and subsequent vertical panels are lifted in a state where the temporary stiffener is temporarily fixed to the temporary fixing members at the left and right end portions thereof, are erected adjacent to the existing vertical panel, and are temporarily installed. The stiffener is removed, and the temporary fixing members at the end portions are connected with a connector, and the standing is completed in a state where the temporary fixing members of all the vertical panels are connected.
(5) Next, the end of each vertical panel is welded, and then the bottom plate and the annular plate are welded.

After the construction procedure (5) according to claim 4, the steel made of a vertical panel, wherein a decorative material is attached to the temporary fixing members at the left and right ends of the vertical panel to conceal the end weld line. How to build a tank.

Instead of the vertical panel in the construction method of the steel tank of claim 4 or claim 5, on the ground of the tank installation place, a vertical panel that has been made into a large block by welding and joining a plurality of the prefabricated vertical panels , A method for constructing a steel tank consisting of vertical panels, characterized in that it is constructed by lifting and standing.