Bracket cover beam method for overall utilization of overpass bridge for highway reconstruction and extension

The invention provides a bracket cover beam method for overall utilization of the overpass bridge for highway reconstruction and extension, which mainly utilizes the upper structure of an original overpass bridge, a support is arranged at the position of a newly built cover beam bracket cover beam, the position of the support is the same as the position of an original cover beam support, and the stress point and system of the upper structure of the overpass bridge are not changed. And the bracket cover beam transmits the gravity of the upper structure to the new and old pile foundations connected by the connecting beam through the high-speed outer newly-built pier column, so that the purposes of no need of dismantling a large number of overpass bridges and normal traffic during construction of the highway reconstruction and extension project are achieved. Construction is easy and convenient, efficiency is high, old bridge dismantling is not needed, high-speed normal passing is achieved, traffic conversion is