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floating foundation

construction
Also known as: caisson foundation

Quick Summary

A floating foundation is a construction method used when soil is too soft to support a building's weight. It functions similarly to a boat, where the structure is buoyed up by the volume of earth displaced during its construction. These foundations are typically rigid, box-like structures made of reinforced concrete slabs or tubs with raised edges. The key principle is that the weight of the removed soil equals the weight of the construction it supports. This method ensures that the pressure on the soil is kept within acceptable limits, preventing damage to the structure.123

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