PSC U Constructing method of PSC U-girder with stiffness control method of lower flange according to longitudinal position and tension stage and Bridge constructed by such method

摘要

In the present invention, in manufacturing a PSC U-shaped girder, the tension member is tensioned in multiple stages over the first and second phases, but the lower flange is in a section of a predetermined length from the point where the side section for fixing the tension member at both ends in the longitudinal direction ends. The first stiffener in the longitudinal direction is reinforced against the compressive force at the time of the first tension, and for the center span section, additionally after the first tension step, a second stiffener is placed on the lower flange and poured into concrete. By forming an additional reinforcement part to increase the thickness of the lower flange and then constructing and constructing the PSC U-shaped girder in a manner that performs secondary tension, the stiffness is adjusted according to the longitudinal position and the tension stage to maximize the efficiency at the time of introduction of prestress. However, after completion, it relates to a PSC U-shaped girder and its construction method that reinforces torsion resistance and flexural stiffness, improves workability and safety during use.