... , Hottest ! HF-20 full hydraulic jet grounting drilling rig 1. ApplicationHF-20 drilling rig is one kind of full hydraulic power head ( ... , such as roadbed, bridges, dam foundation and subway, etc.; The drilling rig has a variety of drilling methods, like: Dry-auger, DTH ... added to achieve the pendulum jet-grouting function. The drilling rig has various chassis mode like skid mounted, crawler mounted, ...