The Use of the Special Girder Span

The Use of the Special Girder Span

In the process of bridge erecting, there are usually special girder span including uphill girder, downhill girder, curing span etc. For this, our company develops the HZQ series bridge erecting cranes. Now take the HZQ40-140 walking type bridge girder launcher as an example.

1.The erection of the first supportbar
When the first supportbar is being erected, the middle trigger usually is on the bridge abutment and the basis of the transverse rail of the middle trigger must be solid to prevent the occurrence of accidents caused by the sink of the bridge erecting crane; before the longitudinal traveling of the front trigger, the height of the front trigger must be adjusted properly to make it in place successfully; before the bridge erecting crane travels longitudinally, everything should be checked to avoid any accidents.
The bridge erecting crane is just put into use when the first supportbar is being erected; therefore, the safe instead of speed concerns most.
2.The erection of the last support bar
When the machine erects the last support bar, the opposition of it is the bridge abutment and the front trigger must be travel on the bridge abutment; hence, the height must be decreased. The machine is equipped with chassis2 specially used for the front trigger, the middle part of which can be disassembled, and then the chassis2 and core plate are connected; finally, the chassis2 and traveling wheel box are connected.