CEMP-E
EI 02G001
01 July 1997
Table 1-4. Concrete Cast in Shell Driven with Mandrel.
LENGTH
3 - 16 M (10 - 120 FT), BUT USUALLY 15 - 24 M (50 - 80 FT)
MATERIAL
ACI 318 FOR CONCRETE
SPECIFICATION
DESIGN
33% OF 28-DAY CONCRETE STRENGTH, WITH INCREASE TO 40% OF 28-
STRESSES
DAY STRENGTH PROVIDING
(1) CASING IS MINIMUM 14-GAUGE THICKNESS
(2) CASING IS SEAMLESS OR SEAMS ARE WELDED
(3) RATIO OF STEEL YIELD STRENGTH Fy TO CONCRETE 28-DAY
STRENGTH IS NOT LESS THAN 6
(4) PILE DIAMETER IS NOT GREATER THAN 0.43 M (17")
DESIGN LOADS
SPECIFICALLY DESIGNED FOR A WIDE RANGE OF LOADS
DISADVANTAGES
SOIL DISPLACEMENT
THIN SHELL MAY BE DAMAGED DURING DRIVING
DIFFICULT TO SPLICE AFTER CONCRETE PLACEMENT
ADVANTAGES
INITIAL LOW COST
TAPERED OR STEP-TAPERED SHELL CAN PROVIDE HIGHER BEARING
CAPACITY THAN STRAIGHT MONOTUBE SHELL IN GRANULAR SOIL
CAN BE INTERNALLY INSPECTED AFTER DRIVING
LOW STEEL USE
APPLICATION
LOADS USUALLY UP TO 1.0 MN (100 TONS)
FRICTION AND/OR END BEARING PILES
HIGH BENDING RESISTANCE
ILLUSTRATION
1-7
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