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Reinforcing an exisitng unreinforced footing

Reinforcing an exisitng unreinforced footing

Reinforcing an exisitng unreinforced footing

(OP)
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?

RE: Reinforcing an exisitng unreinforced footing

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

RE: Reinforcing an exisitng unreinforced footing

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.

RE: Reinforcing an exisitng unreinforced footing

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

RE: Reinforcing an exisitng unreinforced footing

(OP)
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.

RE: Reinforcing an exisitng unreinforced footing

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

BA

RE: Reinforcing an exisitng unreinforced footing

Have you considered replacing the footing rather than enlarging it?

RE: Reinforcing an exisitng unreinforced footing

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.

RE: Reinforcing an exisitng unreinforced footing

(OP)
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.



RE: Reinforcing an exisitng unreinforced footing

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

BA

RE: Reinforcing an exisitng unreinforced footing

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.

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