BRIDGE CONSTRUCTION METHOD

To provide a bridge construction method for constructing a multi-span continuous bridge in which a reduction in construction period is facilitated.SOLUTION: After a beam member 50 is attached to both the ends in the bridge axial direction of a precast girder 22, a construction girder 100 suspends and supports the precast girder 22 to lift it up to the height of a pair of bridge girder column heads 12A, and in this state, each of the beam members 50 is locked to each of the bridge girder column heads 12A, thereby placing the precast girder 22 at the position where the construction is planned. Then, the suspension support of the precast girder 22 by the construction girder 100 is released, and in this state, a joint concrete C is placed in the gap between the precast girder 22 and the pair of bridge girder column heads 12A, followed by introducing prestress in the bridge axis direction between the precast girder 22 and the pair of bridge girder column heads 12A. This allows the work of moving the construction girder 100 to the next construction position and the work of placing the joint concrete C and introducing prestress to be performed concurrently.SELECTED DRAWING: Figure 1 【課題】多径間連続橋を架設する橋梁架設方法において、架設工期の短縮を図る。【解決手段】プレキャスト桁２２の橋軸方向両端部にビーム材５０をそれぞれ取り付けた後、架設用ガーダ１００によってプレキャスト桁２２を吊り支持して１対の橋桁柱頭部１２Ａの高さ位置まで吊り上げ、この状態で各ビーム材５０を各橋桁柱頭部１２Ａに係止することにより、プレキャスト桁２２を架設予定位置に配置する。その後、架設用ガーダ１００によるプレキャスト桁２２の吊り支持を解除し、この状態で、プレキャスト桁２２と１対の橋桁柱頭部１２Ａとの間の隙間に目地コンクリートＣを打設した後、プレキャスト桁２２と１対の橋桁柱頭部１２Ａとの間に橋軸方向のプレストレスを導入する。これにより、架設用ガーダ１００を次の架設位置へ移動させる作業と、目地コンクリートＣの打設およびプレストレスの導入の作業とを並行して行えるようにする。【選択図】図１