Railway steel truss girder combined bridge deck structure and system and construction method thereof

The invention relates to a railway steel truss girder combined bridge deck structure and system and a construction method thereof and relates to the technical field of bridge structures. The combined bridge deck structure comprises a plurality of cross beams distributed at intervals in the longitudinal bridge direction, wherein the cross beams extend downwards, two ends of each cross beam are thin, and the middle of each cross beam is thick; two ends of each groove-shaped beam are erected on the different cross beams, every two adjacent groove-shaped beams arranged in the longitudinal bridge direction are connected through a cast-in-place seam, and the cast-in-place seams are located above the cross beams; the cross beams are arranged between the two longitudinal beams, the two ends of each cross beam are respectively connected with one longitudinal beam, and a plurality of vertical beams are vertically arranged on the longitudinal beams. The structure is simple, stress is reliable, the rigidity of the railwa