segmental bridge girder launcher crane is whole span box girder segment erection construction equipment, simple structure, convenient usage, can greatly improve the construction efficiency. 1. of the main girder of bridge erecting machine with super imposed box girder structure, high stiffness, small deflection. 2. the main structure uses the symmetrical design principle. 3. the bridge machine can carry out two-way construction, and can adapt to the bridge beam feeding and tail beam feeding in two conditions, strong adaptability. 4. this bridge machine operation has the advantages of simple structure, convenient use.