METHOD TO REPLACE BRIDGE DECK SLAB AND PRESTRESSED CONCRETE GIRDER ASSEMBLY USED THEREIN

摘要

The present invention relates to a method to replace an existing deck slab of a bridge including the existing deck slab, while re-using an existing first support girder and an existing second support girder mounted in a pier to be arranged in a longitudinal direction, comprising: an existing deck slab removing step of separating and removing the existing deck slab from the first support girder and the second support girder; a connection concrete forming step of filling an empty space between the first support girder and the second support girder with cast-in-place concrete to form connection concrete; a second tendon installing step of installing a second tendon connecting the first support girder and the second support girder on a rafter of a neutral axis of the first support girder and the second support girder; a first prestressing step of introducing compressed prestressing to the rafter of the neutral axis of the first support girder and the second support girder above the pier by tensioning some of the second tendons; and a new deck slab installing step of installing a new deck slab above the first support girder and the second support girder after the first prestressing step. Moment acting on a span central portion and a continuous point portion is distributed to induce balancing, thereby enabling use of the previously installed existing support girder without separate performance improvement.;COPYRIGHT KIPO 2016