SWIMMING POOL HELICAL INSTALLPROJECT INFORMATION
In July of 2019, Coastal Foundation Solutions was contracted to install helical piles to aid in the stabilization of an in-ground swimming pool and spa at an upscale residence in Naples Florida. Located in one of the state’s premier estate communities, Port Royal is a serene area featuring estates securely nestled at the southern end of Naples. The community is located between Naples Bay and the Gulf of Mexico, where ocean sea breezes and sand scents welcome the doorways of local’s homes. Every section of this expanse is fashioned along very wide canals lined with clever street titles and harbors named after 18th Century pirates that used Southwest Florida as a sheltered anchorage between pillaging adventures.
A Naples custom home builder was constructing an exceptional home for a very personal client. Their mark of quality is in the details and they produce an exceptional product, one that fits their client’s specific needs. The house was in the process of being dried in when the clients elected to relocate the swimming pool five (5) foot.
PROJECT CHALLENGES
A 20 foot by 40 foot in-ground swimming pool and spa with adjoining concrete deck was planned. The pool would have an inclined bottom to provide water depths ranging from 3 to 6 feet.
The concrete pre-stressed foundation piling (25) had been driven for the pool groundwork. The clients desire to relocate the pool entailed re-engineering of the entire pool footing. The project had progressed far enough that accessibility for crawler crane access was eliminated. Consequently, the engineer recommended a helical piling foundation system.
HELICAL PILE INSTALLATIONTHE SOLUTION
Helical piles were determined to be the effective and practical solution for the project. The engineer design for the pool and deck included twenty-eight (28) “Chance” 2.875-inch OD by 0.276-inch wall helical piling. The round shaft helical piles with 8”-10”-12” triple-helix lead sections were utilized. The piles would support design working loads ranging from 12 to 30 kips. With the presence of the fill and weak native soils near the original ground surface, a minimum helical pile depth of 21 feet, as measured from pool deck subgrade elevation, was required
A Kubota track excavator was fitted with a custom mounting bracket to support the drive head with a rated output torque of 10,000 ft-lb. Peat was discovered during the preliminary helical pile installation, requiring additional pile advancement and affecting torque accuracy. Additional extensions were required reach the specified load capacity and structurally-tolerable parameters. The piles were advanced to depths ranging from 21 to 45 feet to achieve torque-correlated ultimate capacities of at least twice the design working loads. The tops of the piles were cut to design elevation and tailored with new galvanized construction brackets to be cast into concrete grade beam. The 28 helical piles were installed in two days.
PRODUCTS
The helical piles were installed by Coastal Foundation Solutions (CFS), a Certified Installer of Seawall Savers and Chance Helical Foundations Systems.
COMPRESSION PILES
Twenty-eight (28) CHANCE 2 7/8” round shaft helical piles with an 8”-10” 12” triple-helix lead section were installed with a 10K Eskridge drive head. The Kubota excavator progressed the extensions to lengths on the order of 21-45 feet to achieve final installation torques. The ultimate capacities of at least twice the design working tension load of 20 kips
Ninety-eight (98) “CHANCE” (RS2875.203) round helical extensions were installed to corresponding capacities to secure tension load of 20 kips.
The helical foundation pilings were affixed with a galvanized 7’ by 7” termination cap.
This helical piling installation was completed in just three days due to access constraints.
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