Precast Panel anchor problem

[nilaypathak]

Precast panels go on outside of water reservoir. Each panel have two top and two bottom plate anchor to wall.
My question: what if anchor hole hit rebar?

Any experience in that conditions, please share
Thanks for your time.

 

[engineertipsman]

I would not use drill in anchors. use Embed plates cast in.

If this is existing, and you have to drill, core drill and use epoxy type anchoring system

 

[JedClampett]

What kind of anchors? Adhesive, wedge, etc?
Please clarify. Are these precast panels part of the water bearing system or are they decorative?
Easy answer is to move the anchors. You don't want to cut the reinforcing bars plus it might affect teh anchor capacity. But without more information, it's hard to say.

 

[nilaypathak]

HI All,
Thanks for your reply,

It is decoretive panels outside of Tank, which protect insulations. top and bottom connections anchore into to existing concrete by Wedge anchors.

thanks,


rakesh

 

[JedClampett]

I think that the attachment mechanism of wedge anchors (metal wedges "biting" into the concrete), would be reduced by reinforcing. Check with the anchor amnufacturer.

 

[anchorengineer]

Hi Rakesh,
I used to be a field engineer for an post installed anchor manufacturing company. If you can't use embed plates then chances are you will need to use a core bit to drill through the rebar. First of all it would be helpfull to know the percentage of rebar hits. You don't want to cut too much reinforcement. Make sure you use a post installed anchor that is meant to be used in a cored hole. Most rely on the roughness of a hammer drilled (especially adhesives). If there is any deterioration of the existing concrete make sure your anchors go deep enough to get their required embedment. Also, keep edge distances and spacing in mind which can lower the anchors capacity. Any specific questions let me know.

 

[csd72]

I would suggest that if these bars are in the existing water tank then you do not cut them. Such cutting is likely to result in cracking which you definately want to avoid in a water bearing structure.

To ensure that you do not cut rebar use a regular percussion drill rather than a core bit. This will not cut through rebar.

If there is not any tolerance in the location of the anchors then I would suggest you use a double angle bracket between the panels and the tank to create this tolerance (it works on 300' signs).

 

[engineertipsman]

I wouldnt think that cutting rebar would matter, i would put the anchors at the top and bottom, depending on the look, the bottom could just be a pin into the footing, and not into the wall. At the top, who cares, the moment is 0ish, thus no cracking to worry about? How tall are the panels