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CASE STUDYCAPTAIN’S QUARTERS

RESIDENTIAL HELICAL INSTALLATION IN MATLACHA, FLPROJECT INFORMATION

In January of 2019, Coastal Foundation Solutions was contracted to install 25 helical foundation pilings at a waterfront residence in beautiful Matlacha Florida.

EXISTING ISSUES

The homeowner elected to go through the process of construction to add an addition to her historic cottage on Matlacha Pass. We worked together with the Historic Preservation Board, who is responsible for the aesthetic, archaeological, cultural, historic, and architectural heritage of the unincorporated areas of Lee County. The review process was a lengthy voyage through historic committees and county hearings. Upon successful approval she selected Inkwerks, a Coastal Design Firm, for construction of her new home addition.

There were several serious constraints and challenges with this project. There was absolutely no parking area for equipment unloading or staging of helical products. The expansion involved severely limited access (7 feet) to install helical foundation piling. The team at Inkwerks contacted Coastal Foundation Solutions to implement a helical foundation plan.

HELICAL FOUNDATION PILINGSTHE SOLUTION

The Captain Quarters is located in Matlacha, Florida just minutes from our office. The contractor selected for the project elected to contract CHS for the installation of twenty-five (25) helical foundation pilings. Coastal Foundation Solutions proposed a strategic plan of installing helical piles to provide a robust support for the new addition to existing structure.

Coastal Foundation Solutions along with Russell and Russell Engineering designed a foundation plan to support the new home addition.

A “CHANCE” Helical Combo Piling system was chosen by the owner, contractor, and engineer as the desired method to provide load bearing for the structure. Each helical pile would be hydraulically driven to solid deep fractured limestone beneath the surface, thereby delivering a trustworthy foundation on which the new wood structure can lie for years to come.

The torque installation was monitored during installation to qualify load bearing capacities. The helical piles were installed by Coastal Foundation Solutions (CFS), a Certified Installer of CHANCE Helical Foundations Systems.

Twenty-five (25) CHANCE SS150 (1.5-inch square bar) helical piles with an 8”-10” 12” triple-helix lead section was installed with a 10K Pro-Dig drive head. The Kubota excavator progressed the square extensions to lengths on the order of twenty-eight feet to achieve final installation torques. The ultimate capacities of at least twice the design working tension load of 12 kips

Seventy -five (75) “CHANCE” (RS2875.203) round helical anchors were installed to corresponding capacities to secure tension load of 12 kips.

Twenty-five (25) Pipe transition connectors were implemented to acquire required load capacity due to sub-surface soil deviations (fractured limestone).

The helical foundation pilings were affixed with a galvanized 7’ by 7” termination cap.

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