Bridge expansion joint device and mounting method thereof

The invention provides a bridge expansion joint device and a mounting method thereof. The bridge expansion joint device comprises a first comb plate mounted at the end of a first beam and a second comb plate mounted at the end of a second beam, and is characterized in that mounting notches are reserved in the end of the first beam and the end of the second beam respectively, a leveling layer and a bottom plate assembly fixed to the leveling layer in an adhesive mode are arranged in the mounting notches. The first comb plate and the second comb plate are arranged above the leveling layer and installed on the bottom plate assembly. The bridge expansion joint device has the advantages that the bridge expansion joint device does not need to prefabricate a bracket, a bridge structure manufacturer does not need to reserve a large notch, before the expansion joint is installed, the bottom plate assembly is bonded and fixed to the leveling layer, then the rotating shaft support is installed, and finally the joint cro