Pile wall
Franki Geotechnics B

Definition:
walls in piles either independent, or tangent, or secant.
The piles can be installed according to the techniques following:
piles independent: all techniques
piles tangent: CFA, GCV, GCV lambda, drilled piles of large diameter, piles double rotation
secant piles: drilled piles of large diameter, piles doubles rotation

Characteristics:
piles independent and tangent: only retained ground. Level of water must be lower than the level of excavation
secant piles: reserve of water and grounds
secant piles: traditionally only one pile out of two is armed (pious sécundaires)
considerable bearing load
no the horizontal reinforcement, it is necessary to envisage a beam of distribution

Scope of application:
when should be crossed obstacles (masoneries, rocks, concrete)
excavations of irregular size (walls in piles are more adaptable than slurry trench walls)
excavations of limited size.
cilindric rigidity in excavations circular limits the quantity of steel