Abstract:Zhengzhou D ramp bridge is southwest of Zhengzhou Ring Expressway - Airport Expressway Interchange Ramp D and B across the airport highway ramp of the overpass,bridge span arrangement for the (23 +38 +35 +21 m) four-span continuous steel box girder.The all-welded bridge girder by girder,single-box double room section,its manufacturing is divided into units of the manufacture,match manufacturing segment,segment pre-assembly and site erection process stage 4.