At a large marina in Palm Beach Gardens, Florida, a 2000-foot walkway along the seawall began to show signs of trouble. Bricks were settling, and sinkholes were forming, creating danger for pedestrians and boat owners. The marina’s concrete seawall with king piles (structural support placed right at the joint between two wall panels) was prone to soil loss through the joints and around the piles. This type of construction is notorious for such problems, which can lead to significant structural issues if left unaddressed. The entire length of the walkway was affected, requiring a comprehensive solution that would minimize disruption to marina operations.
Repair Materials
The repair team used SW-RP1, a high-density polymer foam, to fill voids and stabilize soil. This material offers strength and flexibility, expanding to address common issues in failing seawalls. SW-RP1 is specially formulated for seawall repair, engineered for durability and water resistance. Once injected, it expands and hardens, filling voids and stabilizing the soil behind the seawall. This innovative solution not only restores structural integrity but is also environmentally friendly and safe for marine life.
Procedures
The technicians used ground ground-penetrating radar to scan the walkway, revealing extensive voids in the soil below. This technology allowed the team to visualize underground issues without excavation, enabling precise planning. The team injected SW-RP1 at seawall joints and also between them in this case due to the extent of the voids. The structural polymer injection ensured thorough stabilization of the soil and sealed seawall leaks. Hydrostatic pressure control filters were installed to manage water pressure, allowing excess water to flow into the ocean while keeping supporting soil in place. Repairs were carried out in phases, covering 300-400 feet at a time, minimizing disruption to marina operations. This methodical approach allowed for continuous use of the marina while ensuring the safety of all involved.
Results
The project proved successful, with repairs holding up well over time. This approach was faster, less disruptive, and more cost-effective than full replacement, resulting in a stable, safe walkway for years to come. The use of innovative materials and techniques addressed the root causes of the seawall’s issues, providing a long-lasting solution. The marina now benefits from a restored coastal defense system that not only enhances safety but also preserves the functionality and aesthetics of the waterfront area.