METHOD AND STRUCTURE FOR REDUCING STRESS ACTING ON MAIN GIRDER: Fid-Bau Portal

METHOD AND STRUCTURE FOR REDUCING STRESS ACTING ON MAIN GIRDER

TAMADA KAZUNORI / NAKADA TAKAFUMI / UMEDA YUSUKE

To easily and reliably reduce stress acting on a main girder 20 during a period in which a temporary floor slab 12 is placed in floor slab replacement work of an existing composite girder.SOLUTION: In a floor slab replacement method, after an existing floor slab 11 of a composite girder is removed and set in a temporary state in which a temporary floor slab 12 having a strength capable of being regarded as a rigid body against a force acting in a bridge axial direction AX is placed in the position where the existing floor slab 11 is removed, the temporary floor slab 12 is removed and a new floor slab 13 is placed in the position where the temporary floor slab 12 is removed, in a temporary state, a form 31 is provided in at least a part of a gap G which is a space between another floor slab adjacent to the temporary floor slab 12 and the temporary floor slab 12 in the bridge axial direction AX, and a filling material 32 having fluidity is placed in the form 31 to harden the filling material 32.SELECTED DRAWING: Figure 7

【課題】既設合成桁の床版取替工事において仮設床版１２が配設されている期間中に主桁２０に作用する応力をより容易且つ確実に低減する。【解決手段】合成桁の既設床版１１を撤去し橋軸方向に作用する力に対して剛体とみなすことが可能な強度を有する仮設床版１２を既設床版１１の撤去箇所に配設した状態である仮設状態とした後に仮設床版１２を撤去し仮設床版１２の撤去箇所に新設床版１３を配設する床版取替工法において、仮設状態において橋軸方向ＡＸにおいて仮設床版１２に隣接する他の床版と仮設床版１２との間の空間である隙間Ｇの少なくとも一部に型枠３１を配設し流動性を有する充填材３２を型枠３１の中に打設し充填材３２を硬化させる。【選択図】図７

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