JP3968579B2 - Self-propelled precast slab erection machine - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、既設橋梁のプレキャスト床版の取換工事において使用するプレキャスト床版架設機に関する。
【０００２】
【従来の技術】
従来橋梁におけるプレキャスト床版の架設は、トラッククレーンやフォークリフト、あるいは門型クレーンやジブクレーンなどといった大型機械を使用して行われてきた。しかし、既設橋梁のプレキャスト床版の取換工事においては、床版上に設置する作業機械の重量が床版の耐荷重力によって制限を受けること、また昼間における橋梁の通行を確保するために昼間は作業を中止して作業機械を撤去するよう求められるケースが増えたことなどから、従来使用されてきた各種作業機械それぞれに次のような難点が目立つようになってきた。
【０００３】
▲１▼トラッククレーン
トラッククレーンは自走可能であり、昼間の機材撤去の面では問題はないが、床版を吊り下げたときの総重量が、橋梁架設時に設定された床版の耐荷重力を超えることがあり、また、トラッククレーンの片持ちビームでは床版を吊り下げたときの最小回転半径が大きくなり、トラス橋等路面上に構築物が存在する橋梁など作業スペースの狭い場所ではビームの回転ができず、クレーン車の後方から前方への床版供給が困難となる。
▲２▼フォークリフト
フォークリフトも自走可能であり、昼間の機材撤去の面では問題はないが、吊り装置の改造取付が必要となり、またトラッククレーンに比べて作業半径が小さい。
【０００４】
▲３▼ガーダー
ガーダーは設備が大がかりであり、その組立、解体、運送などに費用がかさむ。したがって、現地で組み立て、解体を繰り返すのは経済的に引き合わず、昼間の機材撤去の要求には応じられない。
▲４▼門型クレーン
門型クレーンは、その走行に鋼製の車輪を使用することから専用レールの敷設が必要となるなど設備が大がかりとなり、これを既設床版上に設置する場合は、門型クレーンの重量が床版の耐荷重力を超えないことが必要となる。また、門型クレーンの組立、解体、運送などに経費がかさむため、前記ガーダーと同様、組み立て、解体を繰り返すのは経済的に引き合わず、昼間の機材撤去の要求には応じられない。
▲５▼ジブクレーン
ジブクレーンも、設備が大がかりなため、前記ガーダーや門型クレーンと同様な機械重量の制限や経済上の問題点がある。
【０００５】
【発明が解決しようとしている課題】
上記従来の技術に鑑み、既設橋梁のプレキャスト床版の取換工事において使用する、小型・軽量で運送時に組立、解体が不要な自走式のプレキャスト床版架設機を提供する。
【０００６】
【課題を解決するための手段】
本発明者は上記課題を下記の手段により解決した。
（１）４本の脚で保持される門型構造体と、該門型構造体の４本の脚を搭載する４台の（ゴムタイヤ又はクローラ等を有する）無軌条式走行装置と、該門型構造体上部の長方形の枠型フレームの下部にその長手方向に配設・固定された２本のレールと、前記２本のレールにそれぞれの長辺が吊設され、かつ前記レールに沿って移動可能な長方形の枠型移動架と、前記枠型移動架の二つの長辺間に架設され、かつ前記枠型移動架の長手方向に移動可能な横梁と、前記横梁に吊設された床版を吊り下げるための吊り下げ装置と、前記枠型移動架の二つの長辺のそれぞれ同一方向の前方端部に垂設された２本の支柱とで構成されてなることを特徴とする自走式プレキャスト床版架設機。
（２）４本の脚で保持される門型構造体と、該門型構造体の４本の脚を搭載する４台の（ゴムタイヤ又はクローラ等を有する）無軌条式走行装置と、該門型構造体上部の長方形の枠型フレームの下部にその長手方向に配設・固定された２本のレールと、前記２本のレールにそれぞれの長辺が吊設され、かつ前記レールに沿って移動可能な長方形の枠型移動架と、前記枠型移動架の二つの長辺間に架設され、かつ前記枠型移動架の長手方向に移動可能な横梁と、前記横梁に吊設され前記横梁に沿って移動可能な床版を吊り下げるための吊り下げ装置と、前記枠型移動架の二つの長辺のそれぞれ同一方向の前方端部に垂設された２本の支柱とで構成されてなることを特徴とする自走式プレキャスト床版架設機。
【０００７】
（３）前記門型構造体が、上部の枠型フレームと４本の逆Ｌ字型の脚とからなり、かつ枠型フレームの短辺部がそれぞれ角筒２本を並置した構造をなし、該角筒部に前記逆Ｌ字型の脚の水平部を一方は右から、もう一方は左から挿入することによって、左右の脚の間隔を変更可能に構成されてなることを特徴とする前記（１）又は（２）に記載の自走式プレキャスト床版架設機。
（４）前記門型構造体の４本の脚、及び支柱が、伸縮可能な鞘管構造をなし、前記門型構造体の高さを変更可能に構成されてなることを特徴とする前記（１）〜（３）のいずれか１項に記載の自走式プレキャスト床版架設機。
（５）門型構造体の枠型フレーム下部に配設・固定された前記２本のレールにそれぞれの長辺が吊設されかつ前記レールに沿って移動可能な長方形の枠型移動架と、前記枠型移動架の二つの長辺間に架設され、かつ前記枠型移動架の長手方向に移動可能な１本の横梁とで構成された２段式レール移送方式の採用によって、床版を吊り下げて移動させる吊り下げ装置の移動範囲を門型構造体の外部にまで拡大可能としたことを特徴とする前記（１）〜（４）のいずれか１項に記載の自走式プレキャスト床版架設機。
【０００８】
（６）前記枠型移動架の二つの長辺のそれぞれ同一方向の端部に垂設された２本の支柱が、床版を吊り下げた吊り下げ装置の門型構造体外部への移送を、安全かつ容易に可能にしたことを特徴とする前記（１）〜（５）のいずれか１項に記載の自走式プレキャスト床版架設機。
（７）プレキャスト床版架設機の吊り下げ装置によって移送された床版を搭載して回転させる回転台車を、前記支柱と門型構造体の前方脚との間に配置してなることを特徴とする前記（１）〜（６）のいずれか１項に記載の自走式プレキャスト床版架設機。
【０００９】
【発明の実施の形態】
本発明の実施の形態を、実施例の図面によって説明する。
図１は本発明実施例の作業時の斜視図、図２は本発明実施例の構成及び各部材の短縮、収容方向を示す説明図であり、図３は本発明実施例の輸送時の斜視図、図４は発明実施例の２段レール式移送方式の概要説明図、図５〜図７は本発明実施例におけるプレキャスト床版架設機の架設動作の説明図である。
図において１はプレキャスト床版架設機、２は枠型フレーム、３は脚、４は無軌条式走行装置、５は基台、６はレール、６ａはレール６の下部フレーム，７は電動スライド式吊設装置、７’、７”はスライド式吊設装置、８は枠型移動架、８ａは枠型移動架８の上部フレーム，９は横梁、１０はチェーンブロック、１１は腕木、１２は支柱、１３，１３’，１３’’は床版、１４はアウトリガー、１５は回転台車である。
【００１０】
【実施例】
本発明実施例の自走式プレキャスト床版架設機１は、図１及び図２に示すように、門型構造体が上部の長方形の枠型フレーム２と逆Ｌ字型の４本の脚３とで構成され、かつ枠型フレーム２の二つの短辺部が、それぞれ２本の角筒を並置した構造をなし、その２本の角筒にそれぞれ一方には右から、他方には左から逆Ｌ字型の脚３の水平部が挿入され、脚３の間隔を拡大・縮小可能としている。そしてこの門型構造体が、左右２組の、前後に２台の無軌条式走行装置４を持つ角柱形の基台５に搭載されて自走可能に構成されている。
また、前記枠型フレーム２の下部にはその長手方向にＨ型状の２本のレール６が配設・固定され、前記２本のレール６に、長辺が断面Ｈ型状の２本のレール８０からなる長方形の枠型移動架８が電動スライド式吊設装置７を介して前記レール６に沿って移動可能に吊設され、前記枠型移動架８の長辺をなす２本のレール８０間にはスライド式吊設装置７’を介して横梁９が枠型移動架８の長手方向に移動可能に架設され、さらに前記横梁９に前記横梁に沿って移動可能な吊り下げ装置としてのチェーンブロック１０が吊設されている。
また、前記枠型移動架８の二つの長辺のそれぞれ同一方向の前方端部には２本の支柱１２が垂設されている。
【００１１】
前記門型構造体を構成する４本の逆Ｌ字型脚３の垂直部、及び前記支柱１２は伸縮可能な鞘型構造をなしており、前記門型構造体の枠型フレーム２の短辺部への脚３の取り付け構造、枠型構造体８、脚３、支柱１２それにアウトリガー１４を、図２に矢印で示した向きに挿入短縮することにより、図１及び図２に示す作業時の形状を、図３に示す輸送時の形状に変化させ、前記プレキャスト床版架設機を分解することなく輸送できるようにしている。
また、枠型移動架８のレール６への吊設は、図４（ａ）に示すように、枠型移動架８の中央部付近に固着された２個の電動スライド式吊設装置７を介して行われる。つまり、図４（ｂ）（ｃ）に示したように前記電動スライド吊設装置７はその下部が枠型移動架８の上部フレーム８ａに固着されており、前記電動スライド吊設装置７の上部には、前記レール６を挟み、かつ前記レール６の下部フレーム６ａの上面に接触しながら回転する車輪Ｗを軸着している。
前記支柱１２は前述のように枠型移動架８の長辺をなす２本のレールの同一方向の前方端部にそれぞれ１本、合計２本垂設されている。したがって、２本の支柱１２は枠型移動架の移動に伴って移動する。
【００１２】
次に本発明実施例のプレキャスト床版架設機１の床版架設操作を説明する。図３及び図４に示した形状で作業現場に輸送されたプレキャスト床版架設機１は、無軌条式走行装置４によって所定位置まで自走した後、脚３の枠型フレーム２からの引き出しと脚３の伸長、及び支柱１２の伸長が行われるとともに、アウトリガー１４によって図５（ａ）に示す形状で床版上に固定される。この際門型構造体の逆Ｌ字型脚３の脚部と枠型フレーム間、及び脚３と基台５との間に図示しない補強用筋交いを用いることも好ましい。
【００１３】
床版上に固定された前記プレキャスト床版架設機１による床版１３の架設作業は、前記床版１３の前記プレキャスト床版架設機１への取り込み、つまりチェーンブロック１０への床版１３の吊り下げ、次いで吊り下げた床版１３の回転台車１５までの移送・搭載、支柱１２の引き上げ、プレキャスト床版架設機１の後退、回転台車１５による床版１３の９０度回転、プレキャスト床版架設機１の前進、支柱１２の着地、チェーンブロック１０による床版１３の吊り上げ、そして所定位置への設置という工程で行われる。
まず、前記床版１３を前記プレキャスト床版架設機１への取り込み、つまりチェーンブロック１０への床版１３の吊り下げは、枠型移動架８の長辺をなす２本のレール８０間に該レール８０に沿って移動可能に架設された横梁９を、図５（ａ）に示す矢印の向きに動かし、前記チェーンブロック１０をプレキャスト床版架設機１の中央部に移動して行う。
【００１４】
図５（ｂ）に示すようにチェーンブロック１０に吊り下げられた床版１３の回転台車１５への移送・搭載は、前記チェーンブロック１０が吊設されている横梁９を、枠型移動架８の長辺をなす２本のレール８０に沿って矢印の向きに、回転台車１５の上まで前進させた後（図６（ｃ）参照）、床版１３を下降させることによって行う。
【００１５】
次いで床版１３の回転を行うが、この際、床版１３の長手方向の寸法が支柱１２と門型構造体の前方脚部３との間隔より小さい場合には、前記チェーンブロック１０の吊り金具のスイベル機構により吊り下げたまま回転できるので、前記回転台車１５に搭載して回転する必要はない。しかし、床版１３の長手方向の寸法が支柱１２と門型構造体の前方脚部３との間隔より大きい場合には、図６（ｄ）に示すように、床版１３を前記回転台車に搭載してチェーンブロック１０から取り外した後、プレキャスト床版架設機１の支柱１２を引き上げるとともに、無軌条式走行装置４を使用して門型構造体を後方に移動させ、床版１３の回転に必要なスペースを確保し、その後前記回転台車１５により床版１３を９０度回転させて図７（ｅ）の状態にする。
【００１６】
前記床版１３の回転を終えると、先に後方に移動させた門型構造体を無軌条式走行装置４を使用して元の位置まで前進させるとともに引き上げていた支柱１２を着地させ、その後回転させた床版１３を再度チェーンブロックによって吊り上げ、図７（ｆ）に示すように、横梁９を枠型移動架８の長辺をなす２本のレール８０に沿ってさらに前方に、既設床版が取り外されている位置にまで移動し、その後チェーンブロック１０の横梁９に沿っての左右移動により位置の微調整がなされながら下降され、図７（ｆ）で１３”と表示した位置に設置される。
なお、図５に１３’として示したのは既設の床版であり、床版１３”を設置した後は、この上に前記プレキャスト床版架設機１を前進させ、次の床版の取り換えを行う。
【００１７】
橋梁の床版を取り換える場合、図５（ａ）に示すように取り換える部分の既設の床版１３’は、既に取り外されて空間となっている。したがって、プレキャスト床版架設機１はその手前に設置するしかなく、このような状態で新しい床版１３を設置するためには、プレキャスト床版架設機１の前方に床版１３を大幅に張り出させて保持する必要がある。しかし、重量のある床版を前方に張り出すとプレキャスト床版架設機１がバランスを損ねる恐れがあり、それを抑止するためにはプレキャスト床版架設機１の重量を大きくするなどの対策が必要となるが、橋梁の床版の耐荷重力を超えて重量を増すことはできず、むしろ輸送の面からも軽量化の要望が強い。
本発明の実施例ではプレキャスト床版架設機１の枠型移動架８の前方端部に垂設された支柱１２を、図６（ｃ）等に示すように、取り外された床版の先にある既設の床版１３’上、若しくは橋桁上に固定することによってプレキャスト床版架設機１の安定化と軽量化を図っている。
【００１８】
【発明の効果】
本発明により下記のような効果が発揮できる。
（１） 特に、門型構造体上部の前記２本のレールに沿って移動可能な長方形の枠型移動架の横梁に吊設された床版を吊り下げるための吊り下げ装置を、門型構造体の前方に大きく張り出せるため、門型構造体直下のトラックから直接プレキャスト床版を吊り下げ装置に吊り下げ、そのまま門型構造体の前方に移送して前記床版を所定の位置に設置することができる。
また、前記移動可能な長方形の枠型移動架の横梁に吊設された床版を吊り下げるための吊り下げ装置が門型構造体の前方に張り出すことによってプレキャスト床版架設機がバランスを欠くという恐れは、門型構造体から引き出された枠型移動架とその先端に垂設された支柱とによって抑止されるのですべての操作が安定に行える。
さらに前記（１）に記載の効果に加えて、
（２） 無軌条式走行装置を備えているので、任意の位置に移動、据え付けが可能であり、かつ移動により床版を傷つけることがない。
（３） 長方形の枠型移動架の前方端部に２本の支柱を設けることにより、架設時の装置反力を６箇所に分散できるので、既設床版の耐荷重力を十分クリアできる。
（４） プレキャスト床版架設機が軽量に構成できるので、既設床版上に設置して作業しても既設床版や橋梁に与える影響は少ない。
（５） プレキャスト床版架設機の高さ及び横幅を１台のトラックに積み込める寸法（実施例では高さ２．４ｍ、幅２．２２ｍ）にまで縮小できるので、運搬時にも床版架設機を分解する必要がなく、また、運搬にあたって道路交通法に基づく特別な許可を必要としない。
（６） 前記（５）に記載したようにプレキャスト床版架設機を分解することなくトラックで現場に運搬でき、かつ、荷台に斜路を付けることにより自走で降ろせるので、プレキャスト床版架設機の運搬にクレーン等の重機を必要とせず、また組立作業も不要なことから、短時間で作業にかかれる。
（７） プレキャスト床版設置時には、橋軸方向、同直角方向への位置の微調整が可能なので、架設が容易になる。
（８） 回転台車の併用により幅員８ｍ程度の長尺床版まで架設できる。
（９） 運搬費、組立解体費等を含むトータルコストの削減ができる。
（１０） 作業性がよく、工程の短縮が図れる。
（１１） プレキャスト床版架設作業時でも建築限界内に収まる大きさなので、橋梁型式、橋梁規模に左右されることなくすべての橋梁で使用できる。
（１２） プレキャスト床版架設機が自走式であることから撤去が容易であり、床版交換工事期間中においても昼間における橋梁の通行を確保したいという要求に容易に応じられる。
【図面の簡単な説明】
【図１】 本発明実施例の作業時の斜視図。
【図２】 本発明実施例の構成及び各部材の短縮、収容方向を示す説明図。
【図３】 本発明実施例の輸送時の斜視図。
【図４】 本発明実施例の２段レール式移送方式の概要説明図。
【図５】 本発明実施例のプレキャスト床版架設機の架設動作の説明図。
（ａ）床版架設機の設置、（ｂ）床版の取り込み。
【図６】 本発明実施例のプレキャスト床版架設機の架設動作の説明図。
（ｃ）床版の移送、（ｄ）床版の回転台車への搭載と床版架設機の後退。
【図７】 本発明実施例のプレキャスト床版架設機の架設動作の説明図。
（ｅ）床版架設機の回転と床版架設機の前進、（ｆ）床版の架設。
【符号の説明】
１：プレキャスト床版架設機
２：枠型フレーム
３：脚
４：無軌条式走行装置
５：基台
６：レール
６ａ：レールの下部フレーム
７：電動スライド式吊設装置
７’、７”：スライド式吊設装置
８：枠型移動架
８ａ：枠型移動架の上部フレーム
９：横梁
１０：チェーンブロック
１２：支柱
１３、１３’、１３”：床版
１４：アウトリガー
１５：回転台車
８０：枠型移動架の長辺をなす２本のレール
Ｗ：車輪[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a precast slab erection machine used in a replacement work for a precast slab of an existing bridge.
[0002]
[Prior art]
Conventionally, precast slabs have been installed on bridges using large machines such as truck cranes, forklifts, portal cranes, and jib cranes. However, in the replacement work of precast floor slabs for existing bridges, the weight of the work machine installed on the floor slab is limited by the load capacity of the floor slab, and in order to ensure the passage of the bridge in the daytime, Due to the increasing number of cases where it is required to stop the work and remove the work machine, the following difficulties have become conspicuous in each of the various work machines that have been used in the past.
[0003]
(1) Truck crane Truck cranes are self-propelled and there is no problem in terms of removing equipment in the daytime, but the total weight when the floor slab is suspended is equal to the load bearing capacity of the floor slab set at the time of erection of the bridge. In addition, the minimum turning radius when a floor slab is suspended is increased in a cantilever beam of a truck crane, and the beam rotates in a narrow work space such as a bridge where a structure exists on a road surface such as a truss bridge. This makes it difficult to supply the floor slab from the rear to the front of the crane truck.
(2) Forklifts Forklifts can be self-propelled, and there is no problem in removing the equipment in the daytime. However, modification of the lifting device is required, and the working radius is smaller than that of truck cranes.
[0004]
(3) Girder Girder is a large facility, and its assembly, dismantling and transportation are expensive. Therefore, assembling and dismantling on-site is not economically inquiring and cannot meet the requirement for daytime equipment removal.
(4) Gate-type cranes Gate-type cranes use steel wheels for their travel, which necessitates the installation of special rails and other equipment, and if this is installed on an existing floor slab, It is necessary that the weight of the crane does not exceed the load capacity of the floor slab. In addition, since it costs money to assemble, dismantle, and transport the portal crane, as in the case of the girder, repeated assembly and disassembly is not an economical matter and cannot meet the requirement for daytime equipment removal.
(5) Jib cranes Jib cranes are large in equipment and have the same machine weight restrictions and economic problems as the girder and portal crane.
[0005]
[Problems to be solved by the invention]
In view of the above-mentioned conventional technology, a self-propelled precast floor slab erection machine that is small and light and does not require assembly and disassembly during transportation is used in the replacement work of a precast floor slab of an existing bridge.
[0006]
[Means for Solving the Problems]
The present inventor has solved the above problems by the following means.
(1) A portal structure held by four legs, four rail-free traveling devices (having rubber tires or crawlers) mounted with the four legs of the portal structure, and the gate Two rails disposed and fixed in the longitudinal direction at the lower part of the rectangular frame frame at the upper part of the mold structure, and the long sides of the two rails are suspended, and along the rails A movable rectangular frame-type movable rack, a horizontal beam that is constructed between two long sides of the frame-shaped movable rack, and that is movable in the longitudinal direction of the frame-shaped movable rack, and a floor that is suspended from the horizontal beam. A suspension device for suspending the plate, and two struts suspended from the front ends of the two long sides of the frame-type moving rack in the same direction. Traveling precast slab erection machine.
(2) A portal structure held by four legs, four rail-free traveling devices (having rubber tires or crawlers) on which the four legs of the portal structure are mounted, and the gate Two rails disposed and fixed in the longitudinal direction at the lower part of the rectangular frame frame at the upper part of the mold structure, and the long sides of the two rails are suspended, and along the rails A movable rectangular frame-type movable frame, a horizontal beam that is constructed between two long sides of the frame-type movable frame and movable in the longitudinal direction of the frame-type movable frame, and a horizontal beam that is suspended from the horizontal beam. A suspension device for suspending the floor slab movable along the two sides, and two struts suspended from the front ends of the two long sides of the frame type movable rack in the same direction. A self-propelled precast slab erection machine.
[0007]
(3) The gate-shaped structure is composed of an upper frame-shaped frame and four inverted L-shaped legs, and the short side of the frame-shaped frame has two rectangular tubes juxtaposed, By inserting the horizontal part of the inverted L-shaped leg into the square tube part from the right and the other from the left, the interval between the left and right legs can be changed. The self-propelled precast slab erection machine according to (1) or (2).
(4) The four legs and the column of the portal structure have a sheath tube structure that can be expanded and contracted, and the height of the portal structure can be changed. The self-propelled precast slab erection machine according to any one of 1) to (3).
(5) A rectangular frame-shaped moving rack in which the long sides are suspended from the two rails arranged and fixed at the lower part of the frame-shaped frame of the gate-type structure and movable along the rails; By adopting a two-stage rail transfer system that is constructed between two long sides of the frame-type moving rack and that is configured by one transverse beam that is movable in the longitudinal direction of the frame-type moving rack, The self-propelled precast floor according to any one of (1) to (4), wherein the range of movement of the suspension device that is suspended and moved can be extended to the outside of the gate-type structure. Plate erection machine.
[0008]
(6) Two struts suspended at the ends in the same direction of the two long sides of the frame-type moving rack are used to transfer the suspension device that suspends the floor slab to the outside of the portal structure. The self-propelled precast slab erection machine according to any one of (1) to (5), which is made safe and easy.
(7) A rotating carriage that mounts and rotates a floor slab transferred by a suspension device of a precast slab erection machine is disposed between the support column and the front leg of the portal structure. The self-propelled precast slab erection machine according to any one of (1) to (6).
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings of the embodiments.
FIG. 1 is a perspective view during working of the embodiment of the present invention, FIG. 2 is an explanatory view showing the configuration of the embodiment of the present invention, shortening of each member, and accommodation direction, and FIG. 3 is a perspective view during transportation of the embodiment of the present invention. 4 and FIG. 4 are schematic explanatory views of a two-stage rail type transfer system according to an embodiment of the invention, and FIGS. 5 to 7 are explanatory views of the erection operation of the precast slab erection machine according to the embodiment of the present invention.
In the figure, 1 is a precast floor slab erection machine, 2 is a frame-type frame, 3 is a leg, 4 is a railless traveling device, 5 is a base, 6 is a rail, 6a is a lower frame of the rail 6, and 7 is an electric slide type Lifting device, 7 ', 7 "are sliding type lifting devices, 8 is a frame type moving rack, 8a is an upper frame of the frame type moving rack 8, 9 is a cross beam, 10 is a chain block, 11 is a brace, 12 is a support column , 13, 13 ′, 13 ″ are floor slabs, 14 is an outrigger, and 15 is a rotating carriage.
[0010]
【Example】
As shown in FIGS. 1 and 2, the self-propelled precast floor slab erection machine 1 according to the embodiment of the present invention has a rectangular frame-shaped frame 2 having an upper gate structure and four legs 3 having an inverted L-shape. And the two short sides of the frame-type frame 2 have a structure in which two square tubes are juxtaposed, respectively, and one of the two square tubes from the right and the other from the left The horizontal portion of the inverted L-shaped leg 3 is inserted, and the interval between the legs 3 can be enlarged or reduced. This portal structure is mounted on a prismatic base 5 having two sets of left and right, two rail-less traveling devices 4 on the front and rear, and is configured to be able to run on its own.
Further, two rails 6 of H-type shape in the longitudinal direction at the bottom of the frame-shaped frame 2 is arranged and fixed, the two rails 6, long side H-shaped cross section shape of the two A rectangular frame-shaped movable rack 8 composed of rails 80 is suspended so as to be movable along the rail 6 via an electric slide type suspension device 7, and two rails forming the long side of the frame-shaped movable rack 8. Between 80, a horizontal beam 9 is installed to be movable in the longitudinal direction of the frame-type moving rack 8 via a slide type lifting device 7 '. A chain block 10 is suspended.
In addition, two struts 12 are suspended from the front ends of the two long sides of the frame type moving rack 8 in the same direction.
[0011]
The vertical portions of the four inverted L-shaped legs 3 constituting the portal structure and the support column 12 have a stretchable sheath structure, and the short side of the frame frame 2 of the portal structure. The structure of attaching the leg 3 to the section, the frame-type structure 8, the leg 3, the column 12, and the outrigger 14 are shortened by inserting and shortening in the direction indicated by the arrow in FIG. The shape is changed to the shape at the time of transportation shown in FIG. 3 so that the precast slab erection machine can be transported without being disassembled.
In addition, as shown in FIG. 4A, the frame-type moving rack 8 is suspended from the rail 6 by using two electric slide-type hanging apparatuses 7 fixed near the center of the frame-shaped moving rack 8. Done through. That is, as shown in FIGS. 4B and 4C, the lower part of the electric slide suspending device 7 is fixed to the upper frame 8a of the frame type moving rack 8, and the upper portion of the electric slide suspending device 7 is fixed. A wheel W that rotates while being in contact with the upper surface of the lower frame 6a of the rail 6 with the rail 6 interposed therebetween is pivotally attached.
As described above, a total of two support columns 12 are vertically provided at the front end portions in the same direction of the two rails forming the long sides of the frame-type moving rack 8. Accordingly, the two struts 12 move with the movement of the frame-type moving rack.
[0012]
Next, the slab erection operation of the precast slab erection machine 1 according to the embodiment of the present invention will be described. The precast slab erection machine 1 transported to the work site in the shape shown in FIG. 3 and FIG. 4 is self-propelled to a predetermined position by the rail-type traveling device 4, and then the drawer of the leg 3 from the frame frame 2 The legs 3 and the columns 12 are extended, and are fixed on the floor slab by the outrigger 14 in the shape shown in FIG. At this time, it is also preferable to use reinforcing braces (not shown) between the leg portion of the inverted L-shaped leg 3 of the portal structure and the frame frame and between the leg 3 and the base 5.
[0013]
The work of laying the floor slab 13 by the precast floor slab erection machine 1 fixed on the floor slab is taken into the precast floor slab erection machine 1, that is, the floor slab 13 is suspended from the chain block 10. Next, the suspended slab 13 is transported to and mounted on the rotary carriage 15, the column 12 is lifted, the precast floor slab erection machine 1 is retracted, the floor slab 13 is rotated 90 degrees by the rotary trolley 15, and the precast floor slab erection machine 1 advancement, landing of the support column 12, lifting of the floor slab 13 by the chain block 10, and installation at a predetermined position.
First, the floor slab 13 is taken into the precast floor slab erection machine 1, that is, the floor slab 13 is suspended from the chain block 10 between the two rails 80 forming the long side of the frame-type movable rack 8. The horizontal beam 9 movably installed along the rail 80 is moved in the direction of the arrow shown in FIG. 5A, and the chain block 10 is moved to the center of the precast floor slab erection machine 1.
[0014]
As shown in FIG. 5 (b), the floor slab 13 suspended from the chain block 10 is transferred to and mounted on the rotary carriage 15. The horizontal beam 9 on which the chain block 10 is suspended is attached to the frame type movable rack 8 as shown in FIG. This is carried out by lowering the floor slab 13 after being advanced to the top of the rotating carriage 15 in the direction of the arrow along the two rails 80 forming the long sides (see FIG. 6C).
[0015]
Subsequently, the floor slab 13 is rotated. At this time, when the dimension in the longitudinal direction of the floor slab 13 is smaller than the distance between the support column 12 and the front leg portion 3 of the portal structure, the hanging bracket of the chain block 10 is used. Since it can be rotated while being suspended by the swivel mechanism, it is not necessary to be mounted on the rotating carriage 15 and rotated. However, when the longitudinal dimension of the floor slab 13 is larger than the distance between the support column 12 and the front leg 3 of the portal structure, as shown in FIG. After mounting and removing from the chain block 10, the strut 12 of the precast floor slab erection machine 1 is pulled up, and the gate-type structure is moved rearward using the railless traveling device 4 to rotate the floor slab 13. A necessary space is secured, and then the floor slab 13 is rotated 90 degrees by the rotating carriage 15 to obtain the state shown in FIG.
[0016]
When the rotation of the floor slab 13 is finished, the portal structure that has been moved backward is advanced to the original position by using the railless traveling device 4, and the column 12 that has been lifted is landed, and then rotated. The raised floor slab 13 is again lifted by the chain block, and as shown in FIG. 7 (f), the existing beam slab is moved further forward along the two rails 80 that form the long sides of the frame type moving rack 8. Is moved to a position where it has been removed, and then moved down along the horizontal beam 9 of the chain block 10 while being finely adjusted in position, and installed at the position indicated by 13 ″ in FIG. 7 (f). The
In FIG. 5, the reference numeral 13 'indicates an existing floor slab. After the floor slab 13 "is installed, the precast floor slab erection machine 1 is moved forward to replace the next floor slab. Do.
[0017]
When the bridge floor slab is replaced, the existing floor slab 13 ′ to be replaced is already removed as shown in FIG. 5A. Accordingly, the precast floor slab erection machine 1 can only be installed in front of it, and in order to install a new floor slab 13 in such a state, the floor slab 13 is greatly extended in front of the precast floor slab erection machine 1. Need to be held. However, if a heavy floor slab is projected forward, the precast floor slab erection machine 1 may lose balance, and measures such as increasing the weight of the precast floor slab erection machine 1 are necessary to prevent this. However, the weight cannot be increased beyond the load bearing capacity of the bridge slab, and there is a strong demand for weight reduction from the viewpoint of transportation.
In the embodiment of the present invention, the column 12 suspended from the front end of the frame type moving rack 8 of the precast floor slab laying machine 1 is placed at the end of the removed floor slab as shown in FIG. The precast floor slab erection machine 1 is stabilized and lightened by being fixed on a certain existing floor slab 13 'or a bridge girder.
[0018]
【The invention's effect】
The following effects can be exhibited by the present invention.
(1) In particular, a suspension device for suspending a floor slab suspended from a horizontal beam of a rectangular frame-type movable rack that is movable along the two rails above the gate-type structure Because it can project greatly in front of the body, hang the precast floor slab directly from the truck directly under the portal structure to the suspension device and transfer it directly to the front of the portal structure to install the floor slab at a predetermined position. be able to.
In addition , the precast floor slab erection machine lacks balance because a suspension device for suspending the floor slab suspended from the transverse beam of the movable rectangular frame-type movable rack projects over the front of the portal structure. This fear is suppressed by the frame-type moving rack drawn out from the gate-type structure and the column suspended at the tip, so that all operations can be performed stably.
Furthermore, in addition to the effect described in (1) above,
( 2 ) Since the trackless traveling device is provided, it can be moved and installed at an arbitrary position, and the floor slab is not damaged by the movement.
(3) By providing two struts at the front end of the rectangular frame-type moving rack, the apparatus reaction force during the installation can be distributed to six locations, so that the load bearing capacity of the existing floor slab can be sufficiently cleared.
(4) Since the precast floor slab erection machine can be configured lightly, even if it is installed on the existing floor slab, there is little impact on the existing floor slab or bridge.
(5) Since the height and width of the precast floor slab erection machine can be reduced to the dimensions that can be loaded on one truck (in the embodiment, the height is 2.4 m, the width is 2.22 m), the floor slab erection machine is also used during transportation. There is no need to disassemble the vehicle and no special permission is required for transportation.
(6) As described in (5) above, the precast floor slab erection machine can be transported to the site by truck without disassembling, and can be lowered by self-propelling by attaching a ramp to the loading platform. It does not require a heavy machine such as a crane for transporting, and does not require assembling work.
(7) When precast slabs are installed, it is possible to finely adjust the position in the direction of the bridge axis and the direction perpendicular to the bridge.
(8) It can be built up to a long floor slab with a width of about 8m by using a rotating carriage.
(9) It is possible to reduce the total cost including transportation cost and assembly / disassembly cost.
(10) Workability is good and the process can be shortened.
(11) Precast floor slabs can be used on all bridges regardless of the bridge type and bridge size because they are within the building limits even during precast slab erection work.
(12) Since the precast floor slab erection machine is self-propelled, it can be easily removed, and it can easily meet the demand for securing bridge traffic in the daytime even during the floor slab replacement work.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of the present invention during operation.
FIG. 2 is an explanatory diagram showing the configuration of the embodiment of the present invention, the shortening of each member, and the accommodation direction.
FIG. 3 is a perspective view of the embodiment of the present invention during transportation.
FIG. 4 is a schematic explanatory diagram of a two-stage rail type transfer system according to an embodiment of the present invention.
FIG. 5 is an explanatory diagram of the erection operation of the precast slab erection machine according to the embodiment of the present invention.
(A) Installation of floor slab erection machine, (b) Incorporation of floor slab.
FIG. 6 is an explanatory diagram of the erection operation of the precast slab erection machine according to the embodiment of the present invention.
(C) Transfer of floor slab, (d) Mounting of floor slab on rotating carriage and retreat of floor slab erection machine.
FIG. 7 is an explanatory diagram of the erection operation of the precast slab erection machine according to the embodiment of the present invention.
(E) Rotating floor slab erection machine and advancing floor slab erection machine, (f) slab erection.
[Explanation of symbols]
1: Precast floor slab erection machine 2: Frame type frame 3: Leg 4: Non-rail type traveling device 5: Base 6: Rail 6a: Rail lower frame 7: Electric slide type suspension device 7 ', 7 ": Slide Type suspension device 8: frame type moving rack 8a: upper frame 9 of frame type moving rack 9: cross beam 10: chain block 12: support columns 13, 13 ', 13 ": floor slab 14: outrigger 15: rotating carriage
80: Two rails forming the long side of the frame type moving rack W: Wheel
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003092781A JP3968579B2 (en) | 2003-03-28 | 2003-03-28 | Self-propelled precast slab erection machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003092781A JP3968579B2 (en) | 2003-03-28 | 2003-03-28 | Self-propelled precast slab erection machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004300688A JP2004300688A (en) | 2004-10-28 |
| JP3968579B2 true JP3968579B2 (en) | 2007-08-29 |
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| JP2003092781A Expired - Lifetime JP3968579B2 (en) | 2003-03-28 | 2003-03-28 | Self-propelled precast slab erection machine |
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| JP7467729B1 (en) | 2023-05-30 | 2024-04-15 | 大成建設株式会社 | Conveyor |
| JP7467733B1 (en) | 2023-05-30 | 2024-04-15 | 大成建設株式会社 | Conveyor |
| JP7384310B1 (en) * | 2023-06-16 | 2023-11-21 | 株式会社Ihi | Joint structure, floor slab and floor slab replacement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5141772B2 (en) * | 1972-07-07 | 1976-11-11 | ||
| JPH01192693A (en) * | 1988-01-26 | 1989-08-02 | Kitagawa Iron Works Co Ltd | Bridge crane |
| JP3027712U (en) * | 1996-02-07 | 1996-08-13 | 株式会社架設工事佐々木組 | Gate crane for paving slab installation |
| JPH1181242A (en) * | 1997-09-03 | 1999-03-26 | Mitsui Miike Mach Co Ltd | Precast block installation device |
| JPH11131427A (en) * | 1997-10-31 | 1999-05-18 | Mitsui Miike Mach Co Ltd | Floor board replacing machine for concrete bridge |
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|---|---|---|---|---|
| JP2019108746A (en) * | 2017-12-19 | 2019-07-04 | 鹿島建設株式会社 | Floor slab installation device and floor slab installation method |
| CN111335178A (en) * | 2020-03-26 | 2020-06-26 | 中铁七局集团第三工程有限公司 | Small-curve-radius steel box girder bridge girder erection machine and erection construction method |
| CN111335178B (en) * | 2020-03-26 | 2022-04-29 | 中铁七局集团第三工程有限公司 | Small-curve-radius steel box girder bridge girder erection machine and erection construction method |
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| JP2004300688A (en) | 2004-10-28 |
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