Secant piles form a strong and rigid system that incorporates both earth retention and groundwater barrier walls. The construction of secant pile walls involves drilling a sequence of interlocking primary (drilled first) and secondary (drilled second) shafts, which together create a solid, continuous secant wall. The concrete within these shafts can either be entirely low-strength or high-strength, or it can be a combination of low-strength primary shafts and high-strength secondary shafts. Steel piles or reinforcing steel are normally set in the secondary shafts. High-strength, unreinforced shafts can also be crafted in a self-supporting circular pattern, popular for its regular use in access shafts leading to tunnels.
The relative impermeability of secant pile walls makes them apt for controlling groundwater flow into an excavation while minimizing drawdown outside the site. With their superior stiffness, these walls are frequently used when there are sensitive structures present behind the proposed wall.
Advantageously, secant piles for cutoff wall construction can be installed by Schnabel’s high-torque drilling rigs. These rigs, even while casing the drill hole, can penetrate harsh drilling conditions. They’re capable of advancing a cased hole through both natural and man-made obstructions, ranging from cobbles and boulders to reinforced concrete, thus enhancing the versatility and efficiency of secant pile walls for various construction and excavation operations.
When constructed and installed by a company, businesses can benefit from the years of experience and high-quality equipment they bring to the table. This ensures that even in challenging conditions, the result is a reliable, secure, and effective solution for excavation support and groundwater control.
Secant pile wall installation by a competent firm ensures the overall integrity, strength, and performance of the construction project. With their impermeability, stiffness, and versatility, secant pile walls cater to a wide range of construction needs while also promoting effective groundwater management.