... : 1 m -6m Drilling diameter: 300mm Multifunction concrete pole dig driller and hanging machine.The driller is ... . Digging machine usage in the electrical construction of various types of concrete pole hotle Photovoltaic PV support pile foundation drilling ... of loess, clay, gravel, sandy containing weathered stone, frozen soil layer. rock, sand, building the backfill garbage, the garbage layer.. Concrete ...