METHOD OF MANUFACTURING PRESTRESSED COMPOSITE GIRDER METHOD THEREOF AND OF CONSTRUCTING CONTINUOUS BIRDGE UPPER STRUCTURE OF USING SAME

摘要

The present invention relates to a method for manufacturing a prestressed steel composite girder, a steel composite girder manufactured by the method, and a method for constructing a bridge overhead structure using the steel composite girder, wherein the upper flange, the lower flange, A girder preparation step of preparing a steel girder extending from a cross section including an abdomen including an abdomen, wherein the steel girder is provided with a plurality of vertical stiffeners disposed at an interval with respect to the longitudinal direction including an end fulcrum; A girder coating step of coating a surface of the steel girder including a part of the surface of the steel material girder other than the first area of the steel material girder in which the casing concrete is synthesized, A steel girder supporting step for supporting the steel girder by supporting the steel girder to a support base, a turnbuckle for connecting the support bracket to the steel girder is connected to at least a part of the vertical reinforcing member to support the steel girder to the support base; A reinforcement step of placing reinforcing bars in a first region of the steel girder where the casing concrete is synthesized; A mold setting step of installing a mold for synthesizing the casing concrete in the first area; A step of installing a coating damage preventing material for blocking the abdomen of the steel girder and the vertical reinforcement and the formwork; A concrete synthesis step of pouring and curing unhardened concrete in the mold to synthesize the casing concrete on the steel girder; A removing step of removing the mold and the painting damage preventing material from the steel girder; This makes it possible to quickly construct a site while ensuring the quality of the coated surface and to prevent the occurrence of cracks in the ends of the casing concrete due to interference with the vertical stiffener due to the fact that the compressive displacement of the casing concrete is not interfered with the conventional vertical stiffener In which a steel composite girder is formed.