UFC 4-151-10
10 September 2001
2-2.3.11
Venting. If a void is provided which extends through to the lower end of the
pile, vent the pile head to prevent the buildup of internal pressure during driving.
2-2.3.12
Tolerances. Locate voids, when used, within 9.5 mm (3/8 in) of the
position shown on the plans. The maximum departure of the pile axis from a straight line,
measured while the pile is not subject to bending forces, should not exceed 3.17 mm (1/8
in) in any 3.05 m (10 ft) length or 9.5 mm (3/8 in) in any 12.2 m (40 ft) length. Overall
sweep should not exceed 0.1 percent of the pile length.
2-2.4
2-2.4.1
General. Cast-in-place concrete piles are not recommended for
applications characterized by severe marine exposures and / or long un-braced lengths.
2-2.4.2
Casings. Use casings that meet the following criteria:
Adequate strength to withstand driving stresses and to resist distortions
imposed by the driving of adjacent piles.
Except for portions of piles embedded more than 1.52 m (5 ft) below the
mud line, casings are to remain in place to reinforce and / or protect the
concrete core. Regardless of any coatings or other means of corrosion
protection provided, do not consider casing metal thicknesses of 3.2 mm
(1/8 in) or less as contributing to the structural capacity of the pile. Extend
casings intended to provide flexural reinforcement to the point of fixity
(defined in paragraph 2-1.1.1) and apportion the casings so that the metal
thickness remaining at the end of the design service life equals or exceeds
that required by analysis. Provisions for corrosion protection are discussed
further in paragraph 2-2.6.2.
2-2.4.3
Minimum Tip Diameter. Use minimum tip diameter of cast-in-place
concrete piles of 203 mm (8 in).
2-2.4.4
Reinforcement. Detail sections of piling requiring internal reinforcing in the
same manner as pre-cast concrete piles. Cover requirements for reinforcing are the
same as for pre-cast piles with spacers provided for longitudinal reinforcement to ensure
that cover requirements are maintained.
2-2.4.5
Concrete Strength. The minimum concrete compressive strength to be
used in the marine environment is 27.58 MPa (4,000 psi) and 24.13 MPa (3,500 psi) in
freshwater applications.
2-2.5
2-8
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