COMPOSITE GIRDER FLOOR SLAB REMOVAL METHOD

To provide a composite girder floor slab removal method capable of improving the efficiency of the work for cutting and removing a floor slab and reducing the work of removing the concrete remaining on the main girder.SOLUTION: An existing floor slab 13 of a floor slab removal section N is cut in a...

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Hauptverfasser: TAKAI YUSUKE, UNO NAUEMON
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a composite girder floor slab removal method capable of improving the efficiency of the work for cutting and removing a floor slab and reducing the work of removing the concrete remaining on the main girder.SOLUTION: An existing floor slab 13 of a floor slab removal section N is cut in a direction perpendicular to a bridge axis at a plurality of locations in the bridge axis direction. Then, concrete between an upper flange 12b of a main girder 12 and the existing floor slab 13 is cut by a prescribed length in the bridge axis direction. Since the cut existing floor slab 13 is lifted and removed, the existing floor slab 13 divided in the bridge axis direction by a prescribed length L can be removed with its full width without being divided in the direction perpendicular to the bridge axis. Further, as the concrete between the upper flange 12b of the main girder 12 and the existing floor slab 13 is cut with a wire saw 80 together with a stud 12d, the amount of concrete remaining on the main girder 12 can be extremely reduced.SELECTED DRAWING: Figure 10 【課題】床版の切断及び撤去作業の効率化を図ることができるとともに、主桁上に残存したコンクリートの除去作業を軽減することのできる合成桁の床版撤去方法を提供する。【解決手段】床版撤去区間Nの既設床版13を橋軸方向の複数箇所で橋軸直角方向に切断した後、主桁12の上フランジ12bと既設床版13との間のコンクリートを橋軸方向に所定長さだけ切断し、切断された既設床版13を吊り上げて撤去するようにしたので、橋軸方向に所定長さLずつ分割した既設床版13を橋軸直角方向に分割せずに全幅のまま撤去することができる。また、主桁12の上フランジ12bと既設床版13との間のコンクリートをスタッド12dごとワイヤーソー80で切断するようにしたので、主桁12上に残存するコンクリート量を極めて少なくすることができる。【選択図】図10