SECANT PILE WALLS

Offering a superior level of water tightness to contiguous pile walls, secant pile walls comprise interlocking CFA or Bored piles in order to reduce water ingress to a manageable (or functional) level. Interlocking of the piles is necessary for excavations in granular material, water-bearing ground, where soil loss between the

piles would pose significant construction problems.

These walls generally comprise the conventional ‘hard-soft' form where the ‘soft', low strength unreinforced, piles are installed first, then the a

lternating ‘hard', reinforced piles, are scalloped in the soft piles.

Case or double rotary CF

A methods can also be used to improve verticality tolerances, though there are limitations on diameter and depth using these systems.