Reinforcing an exisitng unreinforced footing

[Galambos]

Does anyone know of a procedure to grout new reinforcing into an existing, unreinforced footing?

Perhaps, there is a method to drill an oversized hole, insert a bar and then grout it solid.

My footing is 48"sq x 20" thick and I don't need a lot of bars.

Thoughts?

 

[BAretired]

Why do you need reinforcing in such a deep footing?

If drilling is an option, you could provide Dywidag bars through the footing with external anchorage subsequently waterproofed.

BA

 

[dcarr82775]

BA's idea is the way to go, as usual. If you can drill through it, just put in Dywidag or Williams bars and eliminate the epxoy/grout filling the hole problem.

 

[msquared48]

But as BA pointed out, with a 48" thick footing, 20 " thick, if the base plate is at least 8" square, where does bending enter as a factor into the footing? The bearing forces are transmitted directly to the soil over a 4' square area through shear alone, no bending needed...

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[Galambos]

I just KNEW no one would just let it go at adding reinforcing on this board.

since you must know, we are enlarging the footing.

and yes, I have checked it for plain concrete.

 

[msquared48]

Sorry, just trying to help...

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[BAretired]

No need to apologize, Mike. Your comment was perfectly reasonable.

BA

 

[hokie66]

Have you considered replacing the footing rather than enlarging it?

 

[dhoward26]

My question is, what is the size of the existing footing? Is it being enlarged to 48" square?

If it is being enlarged to 48" square then I would drill and epoxy rebar into the existing footing. If you are talking an existing 18" square footing, just replace it.

 

[Galambos]

disagree, BA, the question was not intended to dig out alternatives or to get to why I am wrong.

rather than focusing on my question, the hijacking of other people's posts, as you have done to me before, only distracts from getting to the solution.

 

[BAretired]

Galambos, I have no idea what you are talking about.

BA

 

[hokie66]

Galambos,
I think BA and the rest of us were just trying to help. But if you just want an answer to your original question, find yourself a 48" drill bit, dig down beside the footing to allow access for the drill, and go for it.