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CASE STUDIES:

Pool Deck Renovation Project

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Challenge: An existing single family residence in Ft. Lauderdale, FL underwent a construction project to renovate the swimming pool and pool deck area of the home. The original structure, located on the Intracoastal Waterway, was built at grade level due to the near-surface water table at the site. The renovation project included plans to replace the existing wood deck with a new stone deck and shade structure. Deep foundations were proposed to support both the shade structure and deck, transferring the loads to deeper competent soils and reducing the potential for differential movements. The limited site access and the small work area prevented use of large equipment. Helical piles were initially considered for the project, but due to the extreme…

CASE STUDIES:

Joe’s Crab Shack Repair

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Challenge: Joe’s Crab Shack, built in 1983, is a single story structure with approximate plan dimensions of 80 feet by 120 feet. The building extends from the shoreline over inlet waters on a combined foundation system. The area of the building over land is generally supported on round wood columns, wood beams and wood floor joists. The area of the building overwater was constructed with precast concrete floor panels, concrete beams and twenty-two (22) 14-inch square precast concrete piles. Eleven (11) of these concrete piles were severely deteriorated with spalling concrete and corrosion of the reinforcing steel. The existing structure needed to be temporarily supported while these concrete piles were repaired. A single test boring was completed from the shoreline…

CASE STUDIES:

Vanderbilt Drive Pedestrian Bridges

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Challenge: Collier County planned the construction of two pedestrian bridges on the west side of Vanderbilt Drive. The north pedestrian bridge would be constructed alongside an existing vehicular bridge and the south pedestrian bridge would be constructed alongside an existing box culvert. A utility pipeline also existed between the existing bridge structures and the planned construction. The pedestrian bridges were prefabricated metal structures with concrete decks to be supported on either shallow spread footings or a deep foundation system. The soil profiles in the areas of the bridges generally consisted of loose sands with weathered limestone layers. Weathered limestone was encountered at depths of 32 feet and 68 feet near the proposed north bridge, and 17 to 18 feet near…

CASE STUDIES:

Passenger Terminal Bridge Tie Down Anchors

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Challenge: Airport terminal improvements included the addition of new passenger boarding bridges at a commercial airport in southern Florida. The new bridges were designed to withstand winds up to 90 miles per hour. The engineers determined that supplemental tiedowns were required to boost the wind resistance to 150 miles per hour to withstand hurricane force winds. The engineers of The LPA Group investigated several methods of securing the passenger bridges. One plan used very large, heavy concrete pads with a hook and chain system to provide resistance against the high wind loads. A less costly method was offered to the engineers by NSquare, Inc. They suggested ECP Torque Anchor™ tieback anchors in place of the heavy reaction blocks constructed from…

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