Widening construction of Miyatanibashi bridge

摘要

After the Tyuo-jidousyado freeway (Fuji-yoshida Line) was constructed 25 years ago. the traffic has exceeded the original anticipation far, and the congestion of traffic has been occurring frequently. According to such a situation, the widening construction of the lane is executed from two lanes to three lanes, aiming at increase of traffic capacity. The same kinds of widening construction are expected to be executed more often, because of the increase in traffic from now on. This paper describes the widening construction, performed to the Miyatanibashi Bridge (truss bridge) and Kowasebashi Bridge (plate girder bridge). The widening construction method of truss bridge and plate girder bridge are the same. First step, the floor slab end of an existing bridge is cut Second step, the extension main girder is constructed, and then the floor slab is constructed on the extension main girder. Third step, the existinggirder and extension main girder are connected. Finally the existing slab and the constructed floor slab are connected. This paper also describes the regarded points about future subjects concerned with the widening construction. After the Tyuo-jidousyado freeway (Fuji-yoshida Line) was constructed 25 years ago. the traffic has exceeded the original anticipation far, and the congestion of traffic has been occurring frequently. According to such a situation, the widening construction of the lane is executed from two lanes to three lanes, aiming at increase of traffic capacity. The same kinds of widening construction are expected to be executed more often, because of the increase in traffic from now on. This paper describes the widening construction, performed to the Miyatanibashi Bridge (truss bridge) and Kowasebashi Bridge (plate girder bridge). The widening construction method of truss bridge and plate girder bridge are the same. First step, the floor slab end of an existing bridge is cut Second step, the extension main girder is constructed, and then the floor slab is constructed on the extension main girder. Third step, the existinggirder and extension main girder are connected. Finally the existing slab and the constructed floor slab are connected. This paper also describes the regarded points about future subjects concerned with the widening construction.