Important Things to be Followed Driven Cast-In-Situ Piles

Important Things to be Followed Driven Cast-In-Situ Piles

• Plan movement of rig with respect to group of piles, Based on Priority of the Structure.
• Cross check the location of piles with reference points.(Survey)
• Check the  pile  shoe  for  stiffener    Ensure  full  welding  is  done instead of tack weld.
• Place the pile shoe in the survey locations by excavating 200mm soil and place sand bags above the pile shoe after checking the Point.
• Apply Bitumen in the annular space between the casing and pile shoe to avoid water ingress.
• Check for verticality of casing during driving and Monitor frequently & Record.
• Maintain Height of Fall as per set Calculation .Record the No.of blows and record as per the Format.
• Terminate the pile based on set criteria.
• Check for water ingress inside the casing before concreting using water level indicator(make AIMIL)
• Check for proper welding of rebar lap joints.
• Maintain proper cover.
• Lower the Reinforcement carefully and hold the reinforcement and monitor the same during Extraction.
• Keep the concrete slump between 100mm to 150 mm.
• Proper care  during  withdrawal  of   (The  energy  required  for withdrawal should be half of driving. This will ensure proper compaction of concrete inside.)
• The concrete pressure > overburden pressure always during extraction of casing.
• Check for Theoretical Vs Actual concrete consumption for each pile.
• Check the Top of concrete after extraction from NGL
• Maintain a gap of “6d” between construction of successive piles.(where “d“= diameter of pile )
• Piling sequence is to be followed.
• Pile Driving shall normally be from the center to periphery or from one side to other of a pile group.
• Backfill the Empty bore (unconcreted portion above COL) of the pile with sand or with approved materials.