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.
