OK, so I've started my tunneling project (3" * 12', 5' below grade)
mentioned a few weeks back. The pipe is not comng for a week or so, but I
thought I would start to see what I was getting in to.
I cored drilled the block (2 x 4" holes) last week in 'anticipation' of the
chunnel. I assembled a few tools based on your comments last time, garden
auger, pressure washer, telescoping wand. I decided to start the hole using
my 5' installer's bit to try and get a straight line and see if there were
any obstacles 'out there'? The bit stopped at about 2'+. Damn. Next I got
out the garden auger (3"x3') to see it it was a small object I could grind
out. Nope. So I put the pressure washer to use to see what was impeding my
process? I was hoping it was a soft brick, but it appears to be part of a
concrete block at an angle to the hole.
I've tried cracking the block with a piece of rebar and a 3lb hammer, but it
just breaks little chucks off. I don't have a lot of room to swin, so it's
difficult to use a sledge hammer. Also if I just lay the rebar in the hole
it will skip over the top of the block due to the angle it's positioned. I
don't know if I can dig it out or sink it, as I'm not sure how big it is. I
guess I need a better chisel so I can really smack it. Perhaps some kind of
air chisel for my compressor.
All useful suggestions on a better approach for breaking up the obstruction
would be appreciated.