DAWSON-WAM is a leading specialist in the design and installation of secant piled retaining walls for basements and deep excavations. Secant piles are formed by a sequence of interlocking bored concrete piles, creating a strong, continuous retaining structure. This method is particularly effective in poor ground conditions and sites with a high water table, where alternative systems may not be suitable.
Our in-house teams and specialist partners offer expertise across all aspects of industrial building construction, including:
This system is particularly well-suited for secant wall construction in sensitive environments, offering low-noise, vibration-free installation ideal for city centres and constrained sites.
We offer multiple secant wall configurations to suit different project needs:
Overcoming Ground Challenges & Obstructions
Using our Cased CFA (Continuous Flight Auger) piling system, we can negate flighting risk and maintain precise bore stability, even in variable or difficult ground conditions. Our equipment is capable of boring through:
This capability allows us to maintain programme certainty and minimise the risk of delays when unforeseen ground conditions are encountered.
Our relatively silent and vibration-free piling techniques make secant piled walls ideal for use near existing buildings, roads, and sensitive structures. For tight urban environments, we can also deliver virtually zero-tolerance secant pile installation, maximising usable space without compromising safety or quality.
Secant walls can form a continuous watertight barrier, making them an excellent choice for basement construction and underground car parks. DAWSON-WAM offers complete basement and foundation packages, including:
We also provide full pile testing, along with vibration and noise monitoring, ensuring compliance with industry standards and local environmental requirements.
Visit our Projects Section to see examples of our secant piled retaining wall and basement construction works, or contact us to discuss your project-specific requirements.