This process is often necessary when the original foundation has become unstable due to soil erosion, settlement, or changes in land use. Underpinning typically involves deepening or extending the foundation to reach more stable soil or bedrock, ensuring the structure can support its weight and resist movement.
Common methods include mass concrete underpinning, beam and base underpinning, and using screw piles or mini-piles, each chosen based on the specific site conditions and structural needs.
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