Secant pile walls are used when the shoring systems has to cut-off water flow; retain soils underneath adjacent structures, or in excavations where you can’t install lagging effectively.

Common Uses

  • Stabilize slopes
  • Control groundwater
  • Support excavations and bulkheads

Technical Details

The system can be used for both temporary and permanent shoring applications. Because of the lack of noise and vibration during construction secant pile walls are attractive near buildings, roads and other sensitive structures. Secant pile walls are constructed by drilling overlapping cast in place concrete piles. The overlap or bite is what helps provide the wall stiffness and water tightness. The secant piles are typically reinforced with steel beams, or in some cases a steel reinforcement cage. Primary or infill piles are installed first then after they have cured slightly the secondary or structural piles are installed between them. Pile overlap is typically in the order of 150 to 200 mm (5 to 8 inches). A tangent pile wall is can be used were there are no water seepage or loss of ground concerns. Tangent wall construction has each pile flush against the neighbouring pile.