CONSTRUCTION METHOD FOR A GIRDER BRIDGE CAPABLE OF INCREASING THE SPAN OF A BRIDGE GIRDER AND DECREASING THE HEIGHT OF A GIRDER

摘要

PURPOSE: A construction method for a girder bridge is provided to construct a girder bridge without buckling and with high tenacity by extending the span of a bridge girder and limiting the height of a girder. CONSTITUTION: The construction method for a girder bridge comprises the steps of placing and joining a joint plate with many beam units(3) having a bearing pressure flange(7) longitudinally on both ends, forming a prestressed principle beam(1) by tensioning an inner cable with the appointed strength, placing a bearing pressure flange(7) between anchoring plates and laying an outer cable, installing principle beams(1) between abutments by leaving an appropriate gap widthwise, forming a bridge girder by stopping up the gap by cast-in-place concrete or precast concrete member, and binding up principle beams(1) by a horizontal cable arranged widthwise on the bridge girder, then tensioning the outer cable with the appointed strength to apply prestress on the whole bridge girder.