Secant pile walls are created by drilling or augering a series of overlapping concrete piles reinforced with steel beams or rebar to form a wall. After the initial piles are installed and gain sufficient strength, the secondary piles are installed in between the initial piles to create a continuous and impervious wall.
how they work:
Depending on the project requirements, a secant wall may be designed as a cantilever structure, or supported by struts or ground anchors installed through the wall during excavation.
why you need them:
Secant pile walls can be successfully installed in a virtually any ground conditions, including grounds that are typically difficult to work with. Secant pile walls are ideal for urban construction projects, as they can easily be installed in tight spaces and are more flexible in shape than diaphragm walls.