From: "Arvel L. Williams, P.E." <awilliams(--nospam--at)gwsquared.com>
Date: Tue, 21 Jun 2005 14:34:30 -0500
there any inspection or construction logs?
are some ultrasonic methods, Jay Shiltstone in Dallas has done some this
for me in the past.
only 180 bends I've seen are ACI hooks, but not on anchor
-----Original Message----- From: Rich Lewis
[mailto:seaint02(--nospam--at)lewisengineering.com] Sent: Tuesday, June 21, 2005
2:18 PM To: seaint(--nospam--at)seaint.org Subject: Drilled pier
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.