At the core of Schnabel’s rigid and robust system for earth retention and groundwater cut-off lie the impressive secant pile walls. These walls are meticulously constructed by drilling a series of alternating primary (drilled first) and secondary (drilled second) overlapping shafts, ultimately forming a continuous secant wall.
The versatility of our approach is showcased through the choice of concrete strength within the shafts, which can consist of all low-strength, all high-strength, or a combination of both primary and secondary shafts. Moreover, steel piles or reinforcing steel are strategically placed in the secondary shafts, enhancing the structural integrity of the secant pile walls.
In scenarios where self-supporting circular rings are required, unreinforced high-strength shafts, often utilized for access shafts to tunnels, serve as a reliable solution. The impermeable nature of secant pile walls makes them highly effective in controlling the flow of groundwater into an excavation while limiting drawdown outside the excavation zone. Additionally, their exceptional stiffness positions them as a preferred choice when sensitive structures are located behind the wall, ensuring optimal protection.
A noteworthy advantage of employing secant piles for cutoff wall construction is Schnabel’s high torque drill rigs, renowned for their ability to penetrate hard-drilling conditions while simultaneously casing the drill hole. These cutting-edge drills are capable of advancing cased holes through various obstructions, be it man-made or natural, including cobbles, boulders, and reinforced concrete. Trust Schnabel’s expertise and extensive experience in delivering unmatched secant pile walls, enabling you to tackle diverse construction challenges with utmost confidence.