Rotary digging is the most widely used construction method of bored pile. Rotary drilling rig uses telescopic drill pipe to drive rotary short auger bit, drill bucket or other operating devices to make holes, just like chefs to use different knives to deal with different ingredients, rotary diggin Read More

The barrel drill is a special drilling tool. By cutting a ring groove, the core can be broken by a punch or a screw bit.Due to the different welding and cutting rings, the drill is divided into CB-I, CB-II, CB-III, CB-IV four kinds.Operation notes: when drilling is full, you can lift the drill, and Read More