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Case Studies: New Residence on Tybee Island, GA

Monday, May 19th, 2014 by Allison Rush-Hester

Challenge

A new residence structure was planned for Tybee Island, GA. Tybee Island is one of the coastal barrier islands along the Atlantic Ocean coastline. The entire string of barrier islands along the southeastern U.S. coast serve as a transition zone between the mainland and the ocean. 

The project area lies near the eastern edge of the South Atlantic Coastal Plain. The soils encountered are sedimentary in origin, and consist of layered marine deposits of sands, silts, and clays. Thesedeposits have since been subjected to successive erosion and re-deposition, by fluctuations of sea levels, storm tides, and winds.

Whitaker Laboratory, Inc. tested the soil by auger cuttings and samples. Near surface soils on the site consisted of 4 to 5 inches of stone mixed with topsoil. The liquefaction analysis indicated that the encountered sand stratifications present below the groundwater table do not have potential to liquefy during the design seismic event. Due to the site's location on a barrier island and within close proximity to the ocean, Whitaker provided various options for the foundation support. 1. Shallow spread footing foundation elements can be utilized for support of the structure. 2. Treated 12-inch timber piles can be utilized for support of the structure. 3. Utilize helical piers in conjuction with shallow foundation elements. 

 

Solution

Lowcountry Basement installed twenty-eight Helical Piles to support the new homes structure. Helical Piles are designed such that most of the axial capacity of the pile is generated through bearing of the helix blades against the soil. The helical blades are typically spaced three diameters apart along the pile shaft to prevent one blade from contributing significant stress to the bearing soil of the adjacent blade. They are perfect for new construction and any projects built near the coast.

Project Summary

Company Name: First City Enterprises

Company Contact: Thomas J Beytagh

Certified Pile Installer: Lowcountry Basement Systems

Products Installed: (28) Helical Piles Model 350

our service area

We serve the following areas

Georgia
  • Girard
  • Keysville
  • Sardis
  • Waynesboro
South Carolina Our Locations:

Lowcountry Basement Systems
145 Commercial Ct.
Rincon, GA 31326
1-912-289-8774