CONCRETE DECK FOR GIRDER BRIDGE USING PRESTRESSED FORCE AND BAND STIRRUPS

摘要

An objective of the present invention is to provide a concrete deck for a girder bridge using introduction of prestress and a bent stirrup which arranges an upper rebar of a deck in a compression area to exert compressive stress to reduce an amount of compression rebars used to shorten construction time and reduce construction costs. To achieve the objective, the concrete deck for a girder bridge using introduction of prestress and a bent stirrup comprises: a pair of steel strands placed in a form in a tensioned state; bent stirrups arranged along the steel strands at regular intervals, wherein both ends thereof are bent and pressed on the steel strands, and upper portions thereof protrude higher than a previously designed neutral axis; an upper rebar bound to the upper portions of the bent stirrups to form an integrated tunnel structure; and a deck body finished by depositing concrete in the form to cure the concrete, and then removing the form. Accordingly, the upper portions of the bent stirrups protrude higher than the previously designed neutral axis to arrange the bent stirrups on positions where the upper rebar can exert compressive stress to shorten construction time and reduce construction costs by a reduction in an amount of compression rebars used and arranged on the upper portions of the bent stirrups. Also, one or more bent surfaces are formed on the upper portions of the bent stirrups, and upper rebars whose number corresponds to the number of bent surfaces are arranged to adjust an amount of the upper rebars required to exert compressive stress to match a bridge property.