1. the machine can accomplish the build of girders with carrying and erection at the same time.
2. the machine can erect 4 pieces fo girders with the other two cranes one day, reducing construction cycle.
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. put boundary beam in place one time when it has a side load. without hanging landing leg in the air, safe and reliable
6. if the landing leg front and back is changed a little, it can erect the bridge in a reverse direction
7. The error of bridge girder erection is less than 5mm
8. Unique pin connection, firm and reliable, easy to install
9. A-type fracture surface, continuous girder with low center of gravity, convenient and reliable.