What are the advantages and disadvantages of the construction of the bored pile with auger and rotary drilling? Another auger can drill 1800 diameter piles?
Screw drill to see torque, I use 10T-m. You might be talking about a small spiral drill. In the early 90s, I personally did 3.5 meters of pile, the use is: the first with a diameter of 2.8 meters of drill, and then use the diameter of 3.5 meters drill hole reaming, so completed the diameter of 3.5 meters of pile foundation.As for the rotary drilling machine, we can not rule out the possibility of digging deep, but the cost of equipment and on-site operations are cost-effective. Only the builder knows it; and when it comes to rock formations, rig it.
About partial holes, holes in the deeper, the probability of partial hole is bigger, so the rotary drilling rig is generally shallow excavation, not many partial holes, and the spiral drill can generally be deep drilling, there are partial hole phenomenon, especially in the condition of non-uniform strata.
Suitable for a variety of spiral drilling geological layer, and the hole diameter can reach 3.5 meters (I did at the start of 90s); rotary drilling rig only for certain efficiency with gravel clay layer or work, but for the rock layer, sand layer is not; and rotary drilling rig can not drill deep hole (more than 30 meters deep is more difficult).
