Unit type bridge expansion device and mounting method thereof

The invention provides a unit type bridge expansion device. The bridge comprises a multi-section bridge main body structure, a plurality of sections of expansion joints are arranged between the adjacent bridge main body structures; an embedded steel plate is horizontally arranged in each bridge column structure. A plurality of embedded steel bars are arranged below the embedded steel plate; a telescopic device is arranged above the side, close to the expansion joint, of the embedded steel plate; the telescopic device comprises special-shaped steel. An embedded bolt penetrating through the special-shaped steel and the embedded steel plate is arranged above the special-shaped steel. The high-strength low-shrinkage concrete expansion joint is simple in structure, reasonable in design, convenient to replace, high in strength, good in construction quality, high in economical efficiency and innovative, and traffic influences are reduced by the aid of the high-strength low-shrinkage concreteexpansion joint. 本发明提供一种单