Coastal Foundation Solutions was contacted to provide additional engineering and expertise for the project. We determined that our helical pile tieback anchor system would have to be securely drilled into the subsurface soil to reinforce the proposed vinyl seawall.
In addition, the soil borings revealed poor soils within the range of helical anchor embedment. Consequently, a refined helical tieback anchor system would be required to be designed and engineered. The engineers at Foundation Technologies provided us with an engineered design to secure the required load capacity within the soil configuration.
The structure was directly perpendicular to the salty waters of the Caloosahatchee River, located in a finger canal. The engineered helical system would be installed two (2) foot beneath the proposed 6-foot deep swimming pool to a finished designed depth of eight foot. The new vinyl wall could then be attached to our secure helical piles.
Coastal Foundation Solutions, a contractor that also specializes in marine construction work, always performs our work with precision. With our helical pile experience and technology, there is no pounding and little chance of debris shooting away and hitting boats or adjoining homes. The Town and River seawall project was completed in just a few short days (including material and equipment mobilization). It was another great experience for us, and a successful installation, specifically due to the subsurface soil conditions.
- Twenty-two (22) Seawall Savers SS125 (1 1/4-inch square bar) helical tiebacks with an 8”- 10”- 12” triple-helix lead section with an additional 14” helical extension was installed.
- A Caterpillar 305 CR 12,000-pound excavator with a specialized hydraulic drive head (10K Pro-Dig) was used to rotate anchors into the ground.
- Helical extensions advanced the tieback anchors to distances on the distance of 21 to 28 feet to realize final installation torques.
- The ultimate capacities and design working tension load of 15 kips.
- Twenty-two (22) “Chance SS125” square shaft helical piles with an 8”-10” 12” triple-helix lead section were installed into substrate.
- Twenty-two (22) “Chance SS125” square shaft helical with a 14” lead extension section were installed in addition to the prescribed lead section.
- Fifty-five (55) “CHANCE” (SS125) square helical extensions were installed to corresponding capacities to secure compression load design load requirements.