This method of underpinning is particularly effective in unstable soils, particularly sand, moist and highly reactive soils and works similarly to the theory of the bored piers. After the pit is dug, galvanised steel piles are screwed into the ground using a machine specially designed for this purpose to the depth required as per your engineer’s specifications.












These piles can attain a depth of up to 15 metres. The centre of the steel pile is then filled with concrete and as with the bored piles, the top is then tied into the headstock. The headstock is then covered with concrete. A void is left between the top of the headstock and the bottom of the existing footing. This void is where a jack is placed for jacking to bring the walls of the building as close to original level as possible. Once the building is jacked the void is packed with dry pack grout and the pit is backfilled.

These piles can also be used as a method of support for new structures and slabs.