Drill rod material: the drill rod links the drill bit and tail, transmitting impact energy, torque and flushing. Drill rod material must be high‑hardness steel with tuned C, Cr, Mo, Ni; Mn and Si control toughness and yield. Two connection types—tapered (shallow) and threaded (deep/extendable). Common specs B19/B22/B25, lengths 0.3–3m (some to 10m) and weights ~2.26–3.96 kg/m. Select drill rod material by rig type and hole depth.

With the compulsory implementation of the policy of "automated replacement of personnel and mechanized reduction of personnel", mechanized construction has significantly improved construction efficiency and safety. The use of rock drilling rigs to make blast holes has been widely used in mountain tunnel construction. In the application process, there are problems such as high loss cost, obvious increase in over-under-excavation rate, and high trolley failure rate. Combining the demand information of a mountain tunnel, it introduces how to implement the "nanny-style" trolley application service and management process, and provides reference for construction units in construction preparation, equipment procurement, construction and maintenance management.