Bridge pile driver is a stone below, how to do?
The dynamic test, if the load is small if it scored well, only the impact of iron into the stone
What's your machine, please? If your machine is an impact drill, I suggest you use the hollow hammer. The ventilation is fast, the cross drill is easy to break, the side is slow, and several drilling rigs have their respective numbers. Next time they are talking to you
General use of rotary drilling rig, face a big boulder, it is difficult to rely on hard drilling drilling, can only use impact drill punching, this method has been used quite normal.Rotary drilling rig for open-pit mine, the rock hardness coefficient f is less than or equal to 6 of the rock drilling at the same time, f=7-11 hard interlayer rock drill. When drilling, the rotary moment and the shaft pressure are applied to make the bit rotate and feed, so that the rock can be cut.
