1. Launching girder can accomplish the build of girders with carrying and erection at the same time.
2. The machine can erect 4 pieces of girders with the other two cranes one day.
3. The machine can continue to work just exchanging the front rear legs, no need extra assembly.
4. Unique honeycomb-girder structure, low deflection and high stiffness.
5. If the landing leg front and back is changed a little, it can erect the bridge in a reverse direction.
6. Unique pin connection and easy installation.
7. A-type fracture surface, continuous girder with low center of gravity, convenient and reliable.