INSTALLATION METHOD OF RAHMEN BRIDGE WITH COMBINED GIRDER OF STEEL GIRDER AND CONCRETE WITH MINIMIZED NEGATIVE MOMENT AT ENDS THEREOF

摘要

PURPOSE: A construction method of a rahmen bridge which is manufactured in a simple beam type is provided to minimize the negative moment exerted on both ends of the rahmen bridge under construction. CONSTITUTION: A construction method of a rahmen bridge which is manufactured in a simple beam type is as follows. A central composite girder is made by combining a casing concrete around a lower flange of a steel girder. A tendon built in the casing concrete is pulled to induce compressive stress in the casing concrete. A simple girder(1) is made by combining an end steel girder without concrete on both ends of the central composite girder. The simple girder in which the central composite girder and the end steel girder are combined is mounted on an abutment(70). A main reinforcing bar(61) set to pass the outer sides of the upper corner part on both ends of the simple girder and a vertical reinforcing bar(71) protruded on the abutment by a reinforcing bar coupler. Concrete covering the exposed steel strip of the simple girder, base concrete, and concrete above the abutment are placed at the same time to integrate the simple girder and the abutment.