Unit type bridge expansion device

The utility model 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 the 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. According to the utility model, the structure is simple, the design is reasonable, the replacement is convenient, the strength is high, the construction quality is good, the economy is strong, the traffic influence is reduced, and the practicability is realized. 本实用新型提供一种单元式桥梁伸缩装置，包括多段桥梁主体结构，相邻桥梁主体结构之间设置有多段伸缩缝，桥梁柱体结构内部水平设置有预埋钢板，所