A pile splice is used in foundation design to join two or more piles together to create a single longer pile that can bear a larger load or reach deeper soil layers for increased stability. It is often necessary to splice piles when the required depth of a foundation exceeds the length of the available piles, or when piles need to be joined to support a greater load. The splice must be designed to ensure adequate strength and stiffness so that the pile behaves as a single structural unit. Pile splices can be achieved through various methods, such as welding, bolted connections, or mechanical couplings, depending on the specific project requirements and site conditions.
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