Can hollow stem augers drill through rubbles of concrete?
Can hollow stem augers drill through rubbles of concrete?
(OP)
Can hollow stem augers be used to grout shafts in subsidence areas? Is yes, is there any specific minimum rig size?
Also are these able to drill through all kinds of rubbles including concrete?
Also are these able to drill through all kinds of rubbles including concrete?





RE: Can hollow stem augers drill through rubbles of concrete?
To answer your third question, hollow stem augers do not like rock, concrete or rubble. I've drilled through silt-sand-clay stone using continuous flight augers with a large rig with lots of down crowd but not anything extremely tough,,, and not with hollow stem augers, which inherently have a greater diameter than conventional CFA therefore require more volume of the drilling obstructions (rocks/concrete) to be removed by the auger flights.
If you are looking at using the hollow stem to enable putting a grout pipe or some other product down hole then look at using one of the many duplex type systems available. Rotary percussion with either top or bottom hammer to get through the given drill obstructions to advance your casing to the desired depth. Once at depth, one can trip out the inner drill string leaving you with a cased hole.
Which ever system you choose, I'm sure your driller will ever so politely let you know on the quality of your decision.
RE: Can hollow stem augers drill through rubbles of concrete?
I agree - hollow stems are not the way to go - mucho damage to the augers. Percussion drill is likely the best - didn't say if there were possible caving problems in uncased hole - might not even need casing depending on concrete rubble infill if any.
RE: Can hollow stem augers drill through rubbles of concrete?
RE: Can hollow stem augers drill through rubbles of concrete?
However, in case hard rock is encountered, percussion drilling may be needed. Is it possible to put the percussion drill rod and bit through the auger stem? - and then installing casing underneath. How about placing the packers in the stem?
I know this is going to be a very wierd combination but some drillers may be able to tell me if it is possible.
I am looking for a cheap method and save work too.
RE: Can hollow stem augers drill through rubbles of concrete?