drilling in concrete

Old 09-17-03, 01:10 PM
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drilling in concrete

I'm installing a lamp post in my front yard. I poured a 12 in round column about 24 in deep. The lamp post attaches to the top of the column. I need to drill 3 (1/2 diamater holes) approx 3-1/2 inches deep. I need to drill approx 1-1/4 from the sides. My concern is that the concrete will crack. is there anything I can do to prevent the concrete from cracking?

After drilling I need to install the bolts that expand at the bottom to hold them tight. Will this caues the concrete to crack?

I used high strenght saccrete for the columns.

Old 09-17-03, 01:28 PM
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You probably should have installed(set) J -bolts in the concrete while/as it was poured. The bolts could have been easily lined up with the base of your post support.

But, since you now need to drill. Go to it!!
Just don't expand anything too terribly tight.

Old 09-18-03, 01:00 PM
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How about mounting the anchor bolt in expoxy instead.

Drill the holes, fill with epoxy, drop in the anchor bolt, let cure. Mount lamp post.

Googled on "concrete epoxy anchor bolt" and the following came back (among others):


see #145 in the link below,


see "EPO Anchoring Cement" in the link below,


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