Reverse jacking reinforcing method and jacking structure of concrete box girder bridge

The invention discloses a reverse jacking reinforcing method and jacking structure of a concrete box girder bridge, and the method comprises the steps: obtaining the reverse jacking position, jackingforce and jacking displacement of a box girder bottom plate through the checking calculation of the working condition of the concrete box girder bridge; mounting a steel cross beam at the reverse jacking position; mounting a reverse jacking structure below the steel cross beam to serve as a jacking fulcrum, wherein the reverse jacking structure comprises a jack supported below the steel cross beam; according to the jacking force and the jacking displacement, performing jacking at the jacking fulcrum through a jack; installing a steel longitudinal beam on the bottom plate of the box girder andreinforcing the steel longitudinal beam; and unloading the jacking force, dismantling the reverse jacking structure, and completing reinforcement of the concrete box girder bridge. The problem that areinforcing component bears