Stabilizing a Hillside Foundation, Images 10-19

To set up jacking stations and restore the building to a level condition, the crew shoveled out a level base behind the failed grade beam and stacked cribbing under the floor joists, leaving just enough room for helical piers.

Note the steel chain cast into the original grade beam, which was tied back to the foundation in a failed attempt to stabilize the faulty construction.

After driving in the helical pier, the crew welds on a series of extension shafts in order to reach a necessary depth of at least 20 feet.

A pier is driven.

A digital monitor tied into the hydraulic system provides a constant readout of the force required, confirming that the helical plates have reached the specified bearing capacity.

Pier-and-Beam Solutions: The original grade beam, which had failed, was replaced by a heavily reinforced U-shaped beam tied back at each end to the home's basement foundation.

Pier-and-Beam Solutions: Helical piers driven to a depth of at least 20 feet provide support. A new steel I-beam on steel posts carries the framing.

As the required driving force increased, a drag bar attached to the auger frame helped counter the reverse torque.

The drag bar counters the auger drill's torque.

Space between the cribbing stacks was too tight to use the drag bar; there, the crew struggled to brace the frame against the cribbing without toppling the stacks.

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