Integral beam falling system for sliding operation under main bridge steel structure full-length track

The utility model discloses an integral beam falling system for sliding operation under a full-length track of a main bridge steel structure. The integral beam falling system comprises a temporary supporting system, an on-beam jacking mechanism, a side pier jacking mechanism and a side pier leveling structure. The temporary supporting system is arranged between every two adjacent main piers and comprises a steel pipe pile supporting system, a main supporting beam and a sliding rail. The number of the on-beam jacking mechanisms is multiple, at least two on-beam jacking mechanisms are arranged in the transverse bridge direction of the main bridge steel structure, and at least two on-beam jacking mechanisms are arranged in the longitudinal bridge direction of the main bridge steel structure. Each beam underpinning jack arranged in the transverse bridge direction is supported below the single-span main bridge steel structure which slides in place through a transverse bridge direction supporting device; the side p