Pile Reinforcement work. See what happen at the last.

Minimum vertical reinforcement in bored cast-in-situ piles shall be four 13 mm dia bars and embedded at least half of the pile.
Reinforcement should be assembled and and tied together and should be placed in the piles as a unit before the reinforced portion of the pile is filled with concrete.
When hollow stem auger is used to install piles, the longitudinal steel reinforcement should be placed through ducts in the auger prior to filling the piles with concrete.
All pile reinforcements should have a concrete cover of not less than 65 mm.