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RE: Footing Retrofit/Replacement Ideas

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How about a square reinforced concrete ring around the existing footing that the edges of the existing bear on.  I would assume that the ring and the original footing share the load uniformly and that ring needs to reach under the existing footing on all sides deeply enough to limit the span of the existing footing in order to limit the tension in the existing reinforcing steel to its capacity.  The ring sides would need to be designed for flexure and torsion.  I would place the top of the ring below the bottom of the existing footing so that non-shrink mortar can be dry-packed under the existing edges after the initial shrinkage in the new concrete has taken place.

 

Nels Roselund, SE

South San Gabriel, CA

njineer(--nospam--at)att.net


From: Eknrinc(--nospam--at)aol.com [mailto:Eknrinc(--nospam--at)aol.com]
Sent: Thursday, February 09, 2006 6:50 AM
To: seaint(--nospam--at)seaint.org
Subject: Footing Retrofit/Replacement Ideas

 

I have a project which limits me to having to upgrade a concrete pad footing bearing area. The existing footing is 4' square x 12" deep. Here are my initial ideas:

 

1. Underpin (this requires shoring supported beams)

2. Demolish and replace (this requires shoring supported beams)

3. Pad extension on two sides (may run into existing reinforcement for continuous flexural reinforcement installation/coring) 

 

Any other ideas?

 

Thanks in advance.