Forge Engineering designed the foundations as helical pile anchors, offering no impact, no vibration, or displacement installations. Specific geotechnical information recommended the most economical helical configuration for the structure. This greatly reduced the access of installation equipment to install the designed anchor pile and whalers.
Twelve (12) helical anchors ranging from (14-21) foot long, 1 ½” square shaft Seawall Savers with triple 6” helices were utilized to secure the structure. Piles were designed with marine grade whalers and galvanized bolster plates to maximize the pile holding capacity. The individual helical anchors were load tested with 30-ton hollow hole ram to secure specified 12 Kip capacity. This in turn insures that the helical anchor is set and no slippage occurs.
Coastal Foundation Solutions designed and fabricated a high capacity pivot attachment, which allowed bi-axial movement of the helical termination head. This facilitated the installation of the horizontal wood whaler. A Bobcat MT85 with a customized hydraulic mast was effectively able to install all piles regardless of obstacles, from one upland location.
In addition, fifty (50) cubic yards of clean lime-rock rip-rap was placed at the toe of wall to provide supplementary scour protection. The helical piles were installed by Coastal Foundation Solutions (CFS), a Certified Installer of Seawall Savers Helical Foundations Systems.
Twelve (12) Seawall Saver SS150 (1.5-inch square bar) helical piles with a 6”- 6”- 6” triple-helix lead section was installed with a 6K Eskridge hydraulic drive head. The MT85 Bobcat compact skid loader rotated the square extensions to lengths on the order of 15 to 21 feet to achieve final installation torques. The ultimate capacities of at least twice the design working tension load of 12 kips
Fifteen (15) “Seawall Saver” square shaft helical extensions were installed to corresponding capacities
The helical tension pilings were affixed with a 1” galvanized rod, that is adjoined with a galvanized 7” by 18” structural steel “C” channel.