Drilled pier cracks[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Drilled pier cracks
- From: "Rich Lewis" <seaint02(--nospam--at)lewisengineering.com>
- Date: Tue, 21 Jun 2005 14:18:14 -0500
I was sent some pictures of a concrete drilled pier for a cell phone tower. The top of one of 3 piers is cracked. The cracks radiate from the anchor bolt group. There is a somewhat circular crack that surrounds the bolts and then about 8-12 cracks radiate out to the edge. It appears the anchor bolts have been pulled up slightly. I am told the top surface is out of level on this particular pier, with the crown in the middle.
I have a copy of some of the original calculations of the pier. There are 10-1” dia. Bolts per leg, 78” long. The note says it is to have a 180 degree bend. I have never seen an anchor bolt with a 180 degree bend. Is this common for this type of application?
In order to repair this I think I need to establish the extent of cracking and integrity of the pier. Is there a reasonable way to establish this? Is there an ultrasonic type test that can be run? What kind of results would it tell me? The pier is 6 ft. in diameter and 41 ft. deep.
Anyone ever run into a repair like this before? Any suggestions on a fix? If I could establish that the pier was sound down a certain depth form the top I could request demolishing the bad section and repouring concrete if it wasn’t too deep. Another solution would be to drill 2 piers adjacent to this one and tie the existing leg into the new piers. I would assume that taking the tower down is not an option right now.
Thanks for any suggestions.
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