The cantilever method is one of the most commonly used construction methods in long-span Bridges. It was first used by German engineers to build prestressed concrete continuous beam Bridges, and then it was widely used in pre-stressed concrete T-frame Bridges, continuous T-frame Bridges, cable-stayed Bridges and other bridge types. Its advantage is that the construction does not interfere with the traffic under the bridge, and heavy foot and hand erection can be avoided when the bridge is high. This method is often used in deep mountains and valleys and busy rivers.