PREFABRICATED RAHMEN BRIDGE AND CONSTRUCTION METHOD THEREOF

摘要

The present invention relates to a steel composite rigid frame bridge and a construction method for the same. The construction method includes: a step of preparing an extension unit forming an end of a bridge upper structure and extended to a bridge axis direction, a wall integrally formed with the extension unit and forming a bridge lower structure, an opening corner steel girder embedded in order for an end to be exposed to the extension unit, and a point precast member having an accommodation groove formed on the bottom of the wall; a pile constructing step of fixing a pile onto the ground in order for a head part to be exposed; a point precast member installing step of inserting the head part of the pile into the accommodation groove formed on the bottom of the wall of the point precast member and injecting a grouting material into a space formed by the accommodation groove and the outer circumference of the head part of the pile to integrate the pile with the point precast member; a span unit girder constructing step of connecting a prepared span unit steel girder to an opening corner unit steel girder in the longitudinal direction; a bottom plate mounting step of mounting a prefabricated precast bottom plate on the upper side of the span unit steel girder; and a bottom plate fixing step of connecting the span unit steel girder and the precast bottom plate. The steel composite rigid frame can maintain a stable structure system in which stress is not concentrated in an opening corer unit of a rigid frame bridge and is dispersed. The steel composite rigid frame can remarkably reduce construction time of the rigid frame bridge.