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Pile Installation:
aGrout Placement. After a given hole is augered to its design depth, the auger should tc
withdrawn at a slow uniform rate as the grout is pumped in place. The grout pressure should be
-- sufficient to prevent slou__hing or heaving of the hole and the formation of a non -continuo: is pile.
t
v Obstructions Piles that encounter refusal befor_ reaching design tip elevation should be
abandoned and a new pile drilled.
Tolerances. Piles should be. drilled b% the contractor w accurately as possible in the correct
location. The final position of the pile head should not deviate more than 6 inches from the
location indicated on the plans and should not deviate from the vertical by more than 1/4 inch per
5 feet of length.
3 — Reinforcement. Immediately after a concrete or grout pile is cast, the reinforcing case must be
suspended in the top of the pile. Reinforcing steel should extend far enough above the concrete
—' or grout to insure that a sound connection can be made between it and the structural element it
supports. The cage cannot be "pounded" into the grout using a back -hoe bucket or drift truck
—' boom as this usually indicates that the cage s being pushed into the sidex%alls of the pile boring.
Cut Off. If auger -cast piles require cut off. the concrete or grout must be allowed to sufficiently
cure before it is cut
Correction of Defective Rork: The eeotechnical engineer should evaluate the auger -cast pi:es to
check that sufficient grout was placed at a uniform rate to create a continuous pile. Piles that fail
to meet the requirements of the plans and specifications, or for any other justifiable reason are
unacceptable, should be considered defective and will be rejected.
The contractor should submit plans for correcting any defective work to the architect, owner. and
engineer for review and approval prior to commending the corrective work.
Additional piles should be drilled by the contractor to replace defective piles. All design,
construction and inspection costs associated with pile replacement or changes in the foundation
elements because of improper or defective pile installation should be at the contractor's expense.
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