Assembled bridge expansion joint device

The utility model provides a split mounting type bridge expansion joint device which comprises a plurality of expansion joint units which are spliced with one another. Each expansion joint unit comprises a cover plate, an expansion component located at the bottom of the cover plate and a bolt column used for connecting the cover plate and the expansion component. A plurality of prefabricated holes are formed in the cover plate and are used for inserting the bolt columns; the telescopic component comprises a bridge body, a bent steel bar and an abutting column. The number of the bridge bodies is two, each bridge body comprises a containing cavity and a plug pin hole formed in the containing cavity, and the plug pin holes are matched with the prefabricated holes and used for being connected with the plug pin columns. The two groups of bent steel bars are respectively arranged at the outer side ends of the bridge body; the two abutting columns are arranged below the bridge body respectively. The bridge expansion