bor pile franki

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.