Buffer type bridge expansion device based on bridge safety performance

The invention discloses a buffer type bridge expansion device based on the bridge safety performance. The buffer type bridge expansion device structurally comprises stressed plates, expansion device bodies, side beams, fixed supporting frames, first supporting columns, second supporting columns and a connecting device. The stressed plates are welded to the positions above the expansion device bodies, two or more side beams are arranged and fixed below the expansion device bodies through rivets, the fixed supporting frames are fixed below the side beams through screws, and the connecting deviceis provided with a buckling device, an arc-shaped gear device, a drive device, a linkage device, a transmission device, a fixing device, a gear device, a propelling device and a shell. The buffer type bridge expansion device has the beneficial effects that multiple expansion devices can be connected together through the arranged connecting device, the stress area of the buffer type bridge expansion device is increased, t