UFC 4-151-10
10 September 2001
2-2.5.1
Minimum Thickness of Metal. Determine the thickness of metal from
consideration of loss of section as established in MIL-HDBK-1002/3, Steel Structures,
unless corrosion protection is provided as described in paragraph 2-2.5.2. In any case,
the minimum thickness should not be less than 10.55 mm (0.40 in). Splice plates should
not be less than 9.5 mm (3/8 in) thick.
2-2.5.2
Corrosion Protection. When the required initial minimum thickness of
unprotected metal would be excessive, provide alternative corrosion protection in the form
of concrete encapsulation, bituminous or plastic (epoxy) coatings, flexible membrane /
tape wrappings, or cathodic protection. For cathodic protection refer to
plastic coatings are not considered effective below the mudline and require special care
to avoid damage during driving. In tropical environments, and other locations where
corrosion is particularly severe, encase steel pilings in concrete jackets to at least 0.61 m
(3 ft) below MLLW and provide cathodic protection for the submerged and buried sections
of steel.
2-2.5.3
Cap Plates. Bearing cap plates are not normally required for steel
compression piles embedded in concrete pile caps. Where pile flexure or tension is
intended, tie the tops of steel piles into the cap with reinforcing bars or structural sections
welded to the pile and lap-spliced to the cap reinforcing.
2-2.5.4
for hardware and fittings for H-piling.
2-2.5.5
Limitation on Use. The tips of all steel H-piles having a web thickness of
less than 12.69 mm (1/2 in), and driven to end-bearing on sound rock by an impact
hammer, must be reinforced with a driving tip (shoe). Both penetration resistance and
equipment operation must be closely monitored so as to terminate pile driving
immediately upon reaching refusal on the rock surface.
2-2.6
Drilled Caissons and Auger-Placed Grout Piles. These piles are
covered in both UFGS-0468N Drilled Foundation Caissons and UFGS-02465a Auger
2-2.6.1
Applicability. Usage of drilled caissons and / or auger-placed grout piles is
normally reserved for conditions where driven piles would bear on rock or other hard
bottom, at shallow depth, without sufficient penetration for lateral support or uplift
2-2.6.2
On Hard Bottom (Rock or Hardpan). Use a constant diameter shaft
without the bell. Level sloping surfaces to receive the shaft. Anchorage in the form of
grouted dowels or excavated keys should be considered.
2-9
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