If a large amount of hard rock is encountered on the construction site, the rock formation should be specified in advance when ordering. The manufacturer should increase torque, reserve air compressor interfaces, and equip with impactors and down the hole drill bits.
2. The consumption of consumables in rock construction is higher than that in soil layers, and drill bits and impactors are vulnerable parts that require regular spare parts.
3. With the same drilling rig, the speed of drilling soil layers is much faster than that of drilling rocks. The harder the rocks, the lower the drilling efficiency.