STRUCTURAL BODY FOR THE END BLOCK OF PRESTRESSED CONCRETE/STEEL COMPOSITIVE GIRDER AND METHOD MAKING THE PRESTRESSED CONCRETE/STEEL COMPOSITIVE GIRDER AND METHOD CONSTRUCTING THE CONTINUOS GIRDER

摘要

The present invention is to reduce the cross-sectional area of the lower flange of the I-shaped steel of the preflex girder to 50-60% of the cross-sectional area of the upper flange while adding a stranded wire to the lower concrete casing to be placed on the lower flange, the pre-flection The compressive force introduced to the lower concrete casing is 50% to 60% of the allowable compressive stress of the concrete, and the rest of the compressive force is introduced by the stranded wire, so the amount of steel is drastically reduced and the shape is low and economical. The stress loss is minimized and cracks are prevented in the lower concrete casing, and the closed stirrups and the closed stirrups are arranged parallel to the closed stirrup in the main stress direction in the short block of the lower concrete casing. Splitting and rupture fracture in the direction perpendicular to the short block It is effective to prevent splitting cracking at the fixing plate interface. In addition, the present invention is not only efficient reinforcement work but also through the girder I-type steel abdominal hole because the structure can be arranged parallel to the closed stub to facilitate assembly of the reinforcement structure even in the state of spatial interference caused by the grid-shaped closed stirrup Since the closed reinforcing bar, which is folded and welded on the flange, serves as a shear connector, the steel amount of the shear connector can be reduced accordingly, which is a useful invention having an economic effect.