thought I'd share some pics of my install.
I started off with my trusty Mastercraft Maximum (Canadian Tire brand) hammer drill with a Bosche 7/8" drill bit. I got around 4" deep when I hit rebar on the first hole. I switched to my cordless drill with a 3/4" cobalt bit and started drilling through the rebar. This was after around 1 minute of drilling:
Here's a pic of the regular hammer drill and the SDS rotary. The SDS drill was on for $99 at RONA and the 7/8" bit was another $70 but it was definitely worth it. There's much less vibration which means you can hold the drill steadier - the long bit also means I could stand up vs. get on my knees for the regular bit. It took me less than 30 seconds to drill 8" with the SDS:
To drill the holes, I positioned the column, and drilled through the hole. This way, I could be sure each hole was exactly positioned. I had drawn a line around the base with permanent marker so I could tell if the column was shifting during drilling. It didn't.
My wife was on shop vac duty and held the nozzle right next to the hole to **** out the dust so I could see the bit clearly at all times. Based on suggestions from folks on this forum, I would drill around 2", pull the bit out, vacuum the hole and then drill another 2" and so on.
Here's the first set of holes. The hole at 12 'o' clock was a mistake. I had hit the rebar on that one and even though I drilled it out with the cobalt bit, the SDS bit wasn't getting through on normal drill mode (non-hammer mode). Rather than ruin my bit, I just moved the column back a few inches. I had given myself enough wiggle room when measuring so I knew it would be OK.
As you can see, I used a nylon brush and a blow gun from my air compressor to thoroughly clean the holes out. I did 6 cycles of brush, blow, vacuum for each hole.
Once I was happy each hole was clean, I used this concrete epoxy to fill them half way.
This stuff is STIFF. I did the first hole with my caulking gun but it broke just after I filled the hole. my second caulking gun didn't last much longer. I did the remaining holes with my caulking gun/clamp contraption.
HINT: Listen to the guys recommending a proper, heavy duty gun if you're gonna use epoxy.
One of the anchors didn't go in all the way. This was the hole I used my regular hammer drill for and I suspect the hole wasn't 'true' and straight because that sucker was vibrating and shaking all over the place. It was 8" deep (measured it with my brush) so depth wasn't an issue but it stuck out a bit.
A few passes with my angle grinder and a 60 grit flap disc and problem solved:
This anchor was epoxied pretty good so I don't think losing a couple of mm's will cause probs.
Here's a pic of the first column positioned over the anchors, just before I bolted it in
And a pic of the final set up
Hmmm .. those pictures turned out a lot smaller than I thought they would be. Please let me know if anyone wants me to resize them .. it's just a matter of pointing to a different URL