Check List

The following Check List could be adopted 

1. Date and time of driving. 
2. Date of concreting. 
3. Ground water level. 
4. Length of  pile. 
5. Length of permanent casing. 
6. Set at intervals during the last 3 metres. 
7. Temporary compression of ground. 
8. Concrete mix. 
9. Details of reinforcement. 
10. Volume of concrete  supplied vis a vis theoretical quantity. 
11. Eccentricity plan. 
12. Deviation from verticality 
13. Routine and random check on density of bentonite slurry. 
14. Bentonite clay to be checked for liquid limit, plasticity index etc. 
15. Initial and routine load tests. 
16. The steel reinforcement cage should be properly fabricated. The numerical dia of bars and pitch of helical reinforcement should be as per drawing. 
17. Lap length should be adequate. Adequate circular cover blocks shall be fixed on the links. 
18. The gauge of steel casing should be as per design. 
19. Whenever pile is resting over rocks, it should be properly socketed after ascertaining that it has reached the proper strata and not resting con  stray boulders or any intervening hard strata. In a group of pile the founding level may be different. Test bonng details of nearby areas indicate important information. 
20. In bored cast in situ piles removable steel casing should be driven ahead of boring in soft soil, otherwise large voids may form that can cause damage to green concrete as the casing is withdrawn. 
21. Reinforcement cage is lowered immediately after bore hole bottom is properly cleared and approved. 
22. Spacing of reinforcement should not be closer than 125 mm to ensure proper flow of concrete which must have a minim  of 150-210 mm. 
23. The tip of the trennie should always remain buried for at lest 500 mm in concrete when pile shaft is filled with concrete. 
24. Concreting when started shall be completed in one operation and as fast as possible. 
25. The temporary casing and the tremie i.e. pipe are sometimes progressively removed for very long piles as the concreting proceeds. These operations require very close monitoring to effect speedy action. If the concrete is stiff or it has set it may arch across the casing and get lifted creating cavities and damaging the pile. 
26. In under reamed pile the bulb diameter should be carefully checked immediately before concreting.