3.1.4
Jetting of Piles
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NOTE: Jetting 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
jetting is completed before final driving of any
pile in the cluster.
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Water jets [will be permitted to assist in driving] [may be used in driving
only when specifically authorized by the Contracting Officer] [may be used
to assist driving of the pile through strata which cannot be penetrated
practicably by use of the hammer alone. After the penetration of the
strata requiring jetting has been accomplished, the use of the jet shall be
discontinued and direct hammer driving shall be resumed] [shall not be
permitted to assist in driving]. [Discontinue jetting when the 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].
Jetting method and equipment shall be approved by the Contracting Officer
prior to commencing jetting operations.]
3.1.5
Spudding of Piles
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NOTE: Spudding 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
spudding is completed before final driving of any
pile in the cluster.
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Spudding [will be permitted] [shall not be permitted]. [Discontinue
driving and withdraw the spudding mandrel [approximately 1.5 m 5 feet above
the [calculated] [indicated] pile tip elevation] [immediately after passing
SECTION 02461
Page 24
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