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Existing Isolated Footing can be strenghtened by exension meaning by increasing size with required reinforcemnet. Following is the procedure:
1. Excavating around the footing
2. Removing exsitinf Waterproofing,cleaning and roughening the concrete surface.
3. Drilling & Installing dowels at 25-30cm spacing in both directions using an appropriate adhesive material like Hilti or Fosroc brands.
4. Fastening the new steel bars with the dowels using steel wires. The diameter and number of steel bars should be according to the design.
5. Coating the footing surface with a bonding agent in order to achieve the required bond between old and new concrete.
6. Pouring the new concrete before the bonding agent dries. The new concrete should contain a non-shrinkage material. Apply required waterproofing and backfill with compaction.
i agree with Imran Ahmed answer...
1- Jacketing the existing footing from sides and top
2- Make another footing above the existing footing
3- Make another footing below the existing footing
4- Soil injection to enhance its properties
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