EI 02G001
CEMP-E
01 July 1997
Table 1-2. Precast Concrete Pile Specifications.
LENGTH
12 - 15 M (40 - 50 FT) REINFORCED
18 - 30 M (60 - 100 FT) PRESTRESSED
MATERIAL
ACI 318 FOR CONCRETE
SPECIFICATION
ASTM A-615 FOR REINFORCING STEEL
DESIGN
REINFORCED 0.33 f'c (COMPRESSION); USE GROSS CROSS
STRESSES
SECTION TO DETERMINE ALLOWABLE LOADS
PRESTRESSED 0.33 f'c (COMPRESSION),
MINIMUM EFFECTIVE PRESTRESS 4.8 MPA (0.7 KS)
MINIMUM f'c 34.5 MPA (5.0 KSI)
DRIVING
REINFORCED COMPRESSION - 0.85 f'c
STRESSES
TENSION - 3 (f'c)
PRESTRESSED COMPRESSION - 0.85 f'c - EFFECTIVE PRESTRESS
DESIGN LOADS
SPECIFICALLY DESIGNED FOR A WIDE RANGE OF LOADS
DISADVANTAGES
HIGH INITIAL COST
VULNERABLE TO DAMAGE FROM HANDLING UNLESS PRESTRESSED
PRESTRESSED DIFFICULT TO SPLICE
ADVANTAGES
HIGH LOAD CAPACITIES
CORROSION RESISTANCE POSSIBLE
HARD DRIVING
READILY CUT TO REQUIRED LENGTH
APPLICATION
LOADS UP TO 4 MN (400 TONS)
FRICTION AND/OR END BEARING PILES
HIGH BENDING RESISTANCE
ILLUSTRATION
(e) Closed-end Steel Pipe (CESP). These are relatively light cylinder piles, yet capable of
hard driving and carrying heavy loads to a deep-bearing stratum (table 1-3). They can be readily cut or
spliced to any length. CESP piles can be made closed-end by either a flat or conical tip. Conical tips can
reduce uneven stresses at the pile tip as a result of driving and reduce the potential for damage to the pile.
Pipe piles should be filled with concrete after driving to increase the section modulus and rigidity.
(f) Concrete Cast in Shell (CCS). Steel shells are placed on a mandrel, which can be a
stepped mandrel for stepped shells with the shell of the mandrel driven to the required penetration depth
1-4
Previous Page
