From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
Date: Tue, 27 Jun 2000 12:32:35 -0500
Use option (a).
I would be inclined to use a welded splice. A coupler is better regarding
strength, but they are bigger than the parent bar and will increase the
requirement for cover. I would chip out enough concrete to stagger the
splice location. If you have a mill cert, preheat according to the CE. If
you don't, you will need to assume worst case CE and preheat accordingly.
Depending on the CE, I would be more inclined to use a welded lap splice as
opposed to a welded butt splice. If the CE is low, and the welder and
inspectors are good, a butt splice can be used.
Use an ASTM A706 splice bar.
Use certified welders, and require special inspection!!!
> -----Original Message-----
> From: Tony Diaz [SMTP:ad(--nospam--at)freese.com]
> Sent: Tuesday, June 27, 2000 8:55 AM
> To: seaint(--nospam--at)seaint.org
> Subject: cored concrete beams
> I have a "situation" and am soliciting help from all of you helpful
> folks. Several existing reinforced concrete beams were cored by
> electricians who mistook a deep concrete beam for a CMU wall.
> Unfortunately, all six of the cores were taken near the bottom of the
> beam at midspan. Three #10 bars were cored completely thru.
> My proposed repair would be to either:
> a) expose enough rebar to splice with Bar-Splicer or welded
> splice, then use repair material to patch or
> b) use an external steel plate on each side of the beam using
> thru bolts as needed to carry the stress.
> This happened at several beams with different rebars cut but
> essentially the same results. The beams are either 16 or 28 inches
> wide and 41 inches deep. Currently, the existing beams are
> probably being partially supported by an existing CMU wall
> underneath it. Any suggestions would be appreciated. Thanks.
> Tony Diaz