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12" SD located under building column footing

12" SD located under building column footing

12" SD located under building column footing

My recent inspection revealed a 12" SD (HDPE pipe) running directly under an endwall column footing. The footings, wall/pier have already been poured and the contractor was getting ready to backfill. The endwall footing is 6x6x12" thick, and was upsized for uplift conditions on the PEMB. Bearing pressures are relatively small (generally under 1 ksf for most combinations, and peak to about 1.5 ksf for worst case). the top of the pipe is approximate equal to the bottom of the footing. I don't really like what I'm seeing here, however the continuous wall and continuous footing will also help spread the load and provide additional bearing area. My question is, how have you dealt with similar issues in the past, and should this warrant demoing the foundation, lowering it and passing the pipe through a sleeve in the wall?

I'm not a site designer, and will be sending this information their way for recommendations as well. Thanks for any help you can provide!

RE: 12" SD located under building column footing

I think it will be OK. If the pipe begins to deform, the footing will carry the load to either side of the pipe. And as you implied, the footing is oversized for downward bearing pressure.


RE: 12" SD located under building column footing

if it leaks you are in trouble - relocate the pipe

RE: 12" SD located under building column footing

I would not be happy if I was the owner, retrofit some screw piles or micropile and bolt them to the footing on either side. or re align the pipe.

RE: 12" SD located under building column footing

"MY" recent inspection was accomplished

1. As owner of the facility?
2. As owner's engineer?
3. As contractor's engineer?

1. Your choice.
2. Resolve with owner's approval
3. Tell contractor .. take long vacation

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