Case Studies

Alpha Foundations Case Studies: Amelia Island Private Residence - Fernandina Beach, FL

Sunday, March 8th, 2015 by Lisa Scully

Challenge

An Amelia Island Plantation homeowner chose to demolish and rebuild his home that was the end building of a five-unit complex. It would be necessary to perform an 8-foot-deep excavation immediately adjacent to the neighboring structure. To prevent the unit next door from settling as a result of the demolition and adjacent excavation sodium silicate was chosen to glue the soils together. Sheet pile walls were not an option due to limited site access.

After performing the excavation, the builder noticed a crack forming in the wall of the adjacent structure and noted settlement was occurring to the building. Further inconsistent permeation of the sodium silicate was noted as large volumes of sand began to fall out from under the adjacent structure.  

Solution

Immediately after noticing the sodium silicate began to break down, the builder contacted Alpha Foundation Specialists to stabilize the adjacent building and lift it to its previous level position. Due to the nature of the situation, this project was escalated to emergency status and eight (8) Model 288 Helical Piers were installed just one day after we received the initial call. These piers supported the exposed bottom of the slab and foundation. More than 7 feet of the piers were exposed, so they were fitted with a 3.5 inch external sleeve for the entire exposed section of pile and each shaft was grouted to resist the bending moments being put on the piers.

The structure was then lifted to its previous level position. These piers were later replaced by concentrically loaded piers directly under the foundation so as not to conflict with construction of the new unit. In normal pier applications, the moment of the eccentrically loaded bracket only occurs in the first couple feet and resistance is gained from the soils surrounding the bracket. Therefore, typically only the top 2 to 4 feet is equipped with an external sleeve.

Hardened “soil columns” were created using 500 pounds of PolyLEVEL 100 Soil Stabilization to reinforce the soils under the adjacent structure and the sections of the exposed soil wall where the sodium silicate did not permeate. Additionally, 400 pounds of PolyLEVEL 400 Joint Stabilization were used to fill the void areas between the soil columns and the foundation wall of the new building to eliminate voids left after excavation.

Project Summary

Certified Installer: Alpha Foundation Specialists, Inc.

Products Installed: Eight (8) Model 288 Helical Piers; 500 pounds PolyLEVEL 100SS; 400 pounds PolyLEVEL 400JS

About the author
Lisa Scully is the Marketing Manager with Alpha Foundation Specialists. Her mission is to educate you on the symptoms of and solutions to all types of foundation problems. To learn more about Lisa and Alpha Foundations, visit us at www.alphafoundations.com

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