Secant Piles

Secant piles are an advanced foundation technique used to create robust retaining walls or cutoff walls, particularly in deep excavations or areas requiring groundwater control. This method involves constructing overlapping concrete piles in an interlocking pattern, where primary (soft) piles are installed first, followed by secondary (hard) piles that cut into the primary ones. The result is a continuous, watertight barrier that provides both structural support and groundwater containment. Secant piles are commonly used in urban construction projects, such as basements, tunnels, and underground parking structures, where space constraints and soil conditions demand a strong, impermeable solution. By combining strength and versatility, secant piles offer an effective way to stabilize excavations and protect adjacent structures during construction.