THE HYBRID GIRDER STRUCTURES PRESTRESSED BY USING THE EXTERNAL PRESTRESSING MECHANISM, AND THE CONSTRUCTION METHOD BY RIGID CONNECTION

摘要

The present invention is to provide a construction method of a space truss composite girder using an external prestressing anchorage mechanism, which extends a span length to 100m or more, and remarkably reduces required materials, construction costs, and maintenance costs. The construction method comprises: a step of manufacturing a space truss composite girder; a step of constructing an abutment, a pier (12), and a springing foundation; a step of forming a stressing anchorage space part and an upper chord rigid coupling space part on the abutment, the pier, and the springing foundation; a step of placing the space truss composite girder on the abutment, the pier, and the springing foundation; a step of installing a stroke connecting device in the stressing anchorage space part of the abutment, the pier, and the springing foundation; a step of applying prestress and camber to the space truss composite girder; a step of forming a lower chord rigid coupling device and a statically indeterminate structure; and a step of constructing a floor plate on the top surface of an upper chord.