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Drilling & Existing underground concrete structures

Drilling & Existing underground concrete structures

Drilling & Existing underground concrete structures

(OP)
Does anyone have any thoughts/experience with drilling piles into existing underground concrete structures (reinforced)? The situation is to drill new piles for a secant pile shoring system, but an existing pile is in line with the wall (with no possibility of arching the primary piles).

Can a contractor using CFA drill through a reinforced concrete pile or pile cap? Will he need a high torque rig? Will he have to preinstall a "sacrificial" pile in order to keep the pile aligned when drilling the new piles (equalize friction)?

RE: Drilling & Existing underground concrete structures

If the pile and/or cap are reinforced you have big trouble.  Typically, you can't drill through reinforced concrete.  The steel wraps up on the auger, tears out the teeth, etc.etc.  

I suggest removing the pile cap and relocating the wall around any existing piles.

RE: Drilling & Existing underground concrete structures

Typically obstructions are drilled with a down the hole hammer. Howver, somethings to consider are, what is the obstructions? If it is a 345 kV duct bank, you may not want to drill through it. If it is benign, What is the effect on the pile system with what may be a large obstruction grouted to the pile?

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