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Underpinnings are essential for stability in construction on soft ground or when adding stories to buildings, especially to withstand earthquakes.
Underpinnings are most likely to be needed when construction is done on soft ground, requiring anchoring to bedrock to ensure stability. In scenarios like building additional stories, especially on soft ground, underpinnings become essential to prevent settlement and structural damage due to earthquakes. Remodeling existing structures may also necessitate underpinning if the changes impact the structural integrity and load-bearing capacity.
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