What is the maximum depth below subgrade that driven falsework piles can remain before they need to be removed?

Driven falsework piles are temporary structures used to support a construction element, such as a bridge or a large slab, while the concrete cures. One critical aspect of their use is ensuring that they are removed at an appropriate depth below the subgrade to prevent long-term settlement issues or structural concerns.

The maximum depth at which driven falsework piles can remain is typically regulated by standards that define acceptable limits to maintain site integrity and support capacity. In this case, 11 inches is established as the maximum depth. The reasoning behind this limit includes avoiding excessive load on the subgrade soil that could lead to issues like deformation or instability in the area where the piles are driven. Additionally, this limit is designed to ensure that the piles do not remain longer than necessary, reducing potential complications related to their eventual removal.

While other options present larger depths, they don't adhere to the best practices typically defined in construction guidelines for temporary structures such as falsework piles. Adhering to the established maximum ensures that the falsework serves its purpose temporarily without causing adverse long-term effects on the constructed elements or the surrounding environment.