Pile wall CONTIGUOUS/SECANT

A series of adjacent piles constructed to form an earth retaining structure as a cantilever or a propped cantilever wall. Construction Sequence 1. Bore pile by rotary or CFA technique 2. Construct the pile with longitudinal reinforcement to allow the pile to carry the bending forces 3. Allow concrete to gain its design strength 4. Install a capping beam to tie piles together 5. Excavate soil to be removed Fields of application New basement structures Additional support for highways subject to embankment slippage Bridge abutments carrying horizontal loads Embankment cuttings Environmental Impact Has a positive environmental impact by facilitating earth retaining solutions with the minimum amount of excavation. Technical Specifications Piles are usually constructed with a nominal gap between the piles of 100-150mm. The piles are designed as individual structures to carry lateral bending forces, but are normally tied together at the top with a capping beam to ensure they act monolithically. The contiguous nature of the wall with a gap between the piles usually renders unsuitable for structures retaining fine granular soils with a high water table.