Large diameter bored piles are non-displacement piles used where
very large vertical loads or bending moments must be resisted by a single pile.
Bored pile construction techniques depend on ground stability and the amount of
free ground water. The shaft is excavated using a rotary drilling rig.
The sides of the excavation may be supported by temporary casing, or the use
of drilling fluids such as water or bentonite slurry.
- Setting up on the pile position, pre-drilling, placing temporary casing.
- Introducing drilling fluid.
- Excavation under drilling fluid to the required depth (strata).
- Cleaning of pile bases, placing reinforcing cage, concreting by tremie.
- Concreting to cut-off level plus overpour.
- Extraction of temporary casing, pile completed.
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