through the resistant substrate layer].] [Drive pile the final 1.5 m 5 feet
of penetration [to the maximum penetration per blow established by the
Contracting Officer]. Obtain Contracting Officer's approval of spudding
equipment, prior to commencing spudding operations.]
3.1.6
Predrilling of Piles
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NOTE: Predrilling should not generally be permitted
when:
1. Piles are dependent on side friction in
fine-grained, low-permeability soils (high clay or
silt content) where considerable time is required
for the soil to reconsolidate around the piles;
2.
Piles are subject to significant uplift;
3.
Piles are adjacent to existing structures; and
4. Piles are in closely spaced clusters, unless the
load capacity is confirmed by test and unless
predrilling is completed before final driving of any
pile in the cluster.
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Predrilling [will be permitted] [shall not be permitted] [shall be
provided]. [Discontinue predrilling when pile tip is approximately 1.5 m 5
feet above the [calculated] [indicated] pile tip elevation. Drive pile the
final 1.5 m 5 feet of penetration [to the maximum penetration per blow
established by the Contracting Officer]]. [Obtain Contracting Officer's
approval of predrilling equipment prior to commencing predrilling
operations.]
3.2
PROTECTION
3.2.1
Protection of Piles
Square the heads and tips of piles to the driving axis. Laterally support
piles during driving, but do not unduly restrain piles from rotation in the
leads. Swinging leads [will] [will not] be permitted. Where pile
orientation is essential, take precautionary measures to maintain the
orientation during driving. [Driven batter piles of sufficient unsupported
lengths to cause a measurable deflection shall have free ends secured until
piles are fixed in the structure to prevent excessive bending stresses.]
Handle, protect, and field treat piles in accordance with AWPA M4.
3.2.1.1
Damaged Piles
Driving of piles shall not subject them to damage. Piles which are
damaged, split, broomed, or broken by reason of internal defects or by
improper driving below cutoff elevation so as to impair them for the
purpose intended shall be removed and replaced; a second pile may be driven
adjacent thereto at the Contractor's expense. Minor damaged areas of
treated piles shall be brush-coated with creosote or the same preservative
used to treat the piles. [The Contracting Officer may require the
Contractor to pull certain selected piles after driving for test and
inspection to determine the conditions of the piles. Any pile so pulled
SECTION 02461
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