... , bridge tunnel, etc Geological Prospecting Drilling Rig GX-1TD Drilling Machine1. APPLICATIONS: Geological drilling for railroad, highway, bridge tunnel, ... :Spindle type, mechanical transmission, hydraulic feeding, and steel skid frame mounted.Hydraulic retracting lets drill body away ... hole, in order to hoist or lower the drilling tools. Hydraulic chuck, labor saving. Advanced design, multi-function, ...