... 3)for piling Most popular , Hottest ! HF-20 full hydraulic jet grounting drilling rig 1. ApplicationHF-20 drilling rig is ... industrial, urban and civil building construction, high building basement, and hydraulic engineering, such as roadbed, bridges, dam foundation and subway, ... has a variety of drilling methods, like: Dry-auger, DTH hammer impacting, ODEX tools casing following, etc. Therefore, it can ...