Bored Piles

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Bored Piles
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Bored pile developement

• Why was bored pile system invented?
• There are many type of bored piles
• Have you seen them?
• ..

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Type of Bore piles

• There are two types(Equipment)
• Rotary, Non rotary
• There are two types(Size)
• Small, Large Diameter bored pile
• There are two types(Process)
• Dry Process, Wet Process

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Small bored pile (Dry Process)Ø35,40,50,60
(tripod)N/A (Auger) Discuss Adv.Disadv.
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Casing surcharge
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Casing checking connecting
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Vertical Checking
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Equipment (tripod) Cylinder hammerTackleAir
winch
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ReinforcementSpacer
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Material Quality (general)

• Concrete
• fcgt240 ksc. (cube)
• Cement content gt 300 kg/concrete m3
• Steel
• Main SD-30, As gt 0.5 of total area
• Stirrup SR-24 (single or spiral)gt 6 mm. _at_
  0.30m(Max.)

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Process for Tripod

• Pre bore depth 1.00-1.50 m. by boring tackle
• Checking position, vertical line
• Casing..Length 1.00-1.20 m. .gtgt Stable stratum
  (BKK clay 20.00-23.00 m.)
• Boring ..casing and boring until required depth
• Cleaning bored holeNo slump concrete and compact
• Reinforcing steel install..
• Pouring concrete.
• Removing casing(details in class)
• Checking..

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Wet Process

• From limitation of Dry process
• Discuss Adv. Disadv.
• Shape Circular, Rectangular (Barrette)
• Thailand (BKK)
• Up to 1500 T. in capacity
• More than 60 m. in depth
• Up to Ø 2.00 m.

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Method statement (Drilling Rig)

• Insert steel casing by hydraulic vibrator
• Start drilling by auger until digged to sand
  layer
• Add Bentonite slurry into the bore hole to
  protect collapse of side of bore hole
• Continue drilling by using Bucket under bentonite
  slurry till reach to the require depth
• Pull drill and insert rebar cage
• Add Tremie and pouring concrete (details in
  class) replaced sullry to Betonite plants
• During place concrete and pull casing Complete

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Bucket Auger
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Hydraulic Vibrator.Steel case
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Check vertical line
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Bored pile diagram
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Expanded pile tip
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Rebar cage Checking depth
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Tremie pipe
3-5 m.
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Tremie Plug
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Bentonite Slurry

• Why..use it?
• EX. General Characteristic (change under Eng.)
• PH gt7
• Density 1.02-1.15 T/m3 Quantity 2-6by weight
• Viscosity 30-90 sec. (Marchs Cone Test)
• Maximum sand content lt 6
• Level of Bentonite 2.00 m. from top of casing

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Bentonite(2)
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Desander Desilter
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Checking Report

• Checking Quantity of poured concrete and
  calculated volume continuously
• Avoid/Do not disturb bored piles those concrete
  not setting

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Tangential piles as retaining wall