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Conventional concrete underpinning is the process of making small excavations under existing footings then filling the voids with concrete. This may be done to transfer the load to a more suitable bearing stratum or to offer protection from undermining the foundation during an adjacent excavation.
The process is repeated along the line of the building to be supported, thus transferring the bottom of footing to a lower elevation. If the design dictates, the concrete underpinning blocks can be supported laterally by means of reinforcing steel, soil nails or even tieback anchors as the excavation depth requires.
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