UFC 4-151-10
10 September 2001
2-2.6.3
On Other Bottom Surfaces. Consider shaft and bell construction if loads
are heavy enough to warrant use of the bell. Unless supported on piling, embed the bell
0.61 to 1.22 m (2 to 4 ft) into firm material.
2-2.6.4
Minimum Reinforcement. Determine reinforcement by design
requirements, not by a minimum reinforcement ratio.
2-2.6.5
Embedment of Piling into the Bell. Embed piling into the bell as required
for transfer of load. Where tremie placement is employed, use 69 kPa (10 psi) bond
resistance between pile and concrete, plus compression resistance of top of pile bearing
in bell.
2-2.6.6
Protection for Reinforcement. The requirement for protection for
reinforcement is the same as for concrete piling.
2-2.6.7
Thickness of Metal Shell and Corrosion Protection. The requirements
for thickness of metal shell, and corrosion protection, are the same as for steel cased
cast-in-place concrete piles.
2-2.6.8
Installation. Tremie placement of concrete fill is permitted. Provide for
final cleanout of the bell or base of the cylinder immediately before concreting.
2-2.7
Steel Pipe Piles. Use pipe piles that conform to the applicable
requirements for both steel H-piles and cast-in-place concrete piles (refer to paragraphs
2-2.7.1
2-2.7.2
Open-End Piles. Reseat pipes installed with an open tip to full bearing
after being cleaned out. If the pipe exhibits 50.8 (2 in) or more of additional penetration
during re-seating, cyclically re-clean and re-drive until penetration on subsequent re-
driving is less than 50.8 mm (2 in). If leakage of water into the pile is minor, pump the pile
out and place one cubic yard of grout as an initial seal before the balance of concrete or
sand fill is installed. If water leakage renders dry grout placement impractical, fill the pipe
pile to its top with clean water and tremie the grout plug. Deposit the grout seal by means
of a grout pipe to an elevation of at least 0.91 m (3 ft) above the bottom of the pile. After
a sufficient time has elapsed to allow the grout to set, pump the pile dry and fill remaining
space with concrete or clean dry sand.
2-2.7.3
12.7 mm (1/2 in) beyond the pipe wall.
2-10
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