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Bored cast-in-situ pile procedure

Short answer

Construction involves drilling a hole under slurry or casing, cleaning, placing reinforcement, and placing concrete via a tremie pipe from bottom up, displacing slurry. The casing is gradually withdrawn as concrete rises, then the pile head is cured and cut to the cut‑off level.

Explain the procedure for constructing bored and cast-in-situ pile.

A bored cast-in-situ pile is formed by drilling a hole in the ground and filling it with reinforced concrete. Because soil is removed, there is little displacement and vibration.

Procedure

  1. Set out the pile position and set up the boring rig (auger or rotary).
  2. Boring: drill the hole to the required depth. In loose or collapsing soil use a temporary casing or bentonite slurry to keep the hole stable.
  3. Cleaning: remove loose soil and cuttings from the bottom (using a cleaning bucket) and check depth and verticality.
  4. Reinforcement: lower the prefabricated steel cage with spacers.
  5. Concreting: place concrete through a tremie pipe from the bottom up (so that it does not segregate), keeping the tremie embedded in the concrete. The slurry is displaced upwards.
  6. Casing withdrawal: pull out the casing as the concrete rises, keeping enough concrete head inside.
  7. Curing and cut-off: after setting, cut the pile head to the cut-off level and connect to the pile cap.

✓ Answer checked by Claude Sonnet 5.5

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