What about the foundation of HZQ40/160 walking type bridge girder launcher?
HZQ40/160 walking type bridge girder launcher is a new model launching gantry which designed by ZZHZ. 
The foundation must be done well before erecting girder:
1. the digging of foundation ditch
the foundation ditch is dig by excavator, the rock which can’t be dig by excavator adopts pneumatic pick crushing etc.
2. basement
when the basement is dry, making it wet. When the basement is rock, wetting and packing a layer 2～3cmcement.
