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Underpinning with Helical Piers

Location: Ladue, MO

Job Type:

Overview:

 A new Squash court addition was being added to this residence. The lower elevation of the squash court was approximately 15 ft. below the existing footing elevation of the residence.

Problem:

As the result of the excavation involved to construct the addition and the code clearance requirements involved, Helitech constructed a temporary shotcrete wall to retain the vertical cut. Sheet piling was not an option, due to the impact it would have induced upon the residence, and timber/lag retention system was not an economical solution.

Solution:

Helitech installed (10) ten A.B. Chance Helical Piers to support the North & West foundation walls. Helitech then transferred loads of the structure to the piers, which reduced surcharge loading of the soil. Piers were installed to 30-50 Kip capacities and consisted of an 8-10-12 in. diameter helix configuration. Piers reached load capacities at 20-30 ft. depths.

Foundation Piering Case Studies