Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)
The Effect of Bitumen Slip Coating on the Driveability of Precast Concrete Piles
G.A. Chapman & J.P. Wagstaff; John Wagstaff Constructions Pty. Ltd., Australia J.P. Seidel; Pile Test Pty. Ltd., Australia
Pile foundations of the deep segmental precast concrete type were chosen to support a large newspaper printing press and associated paper storage dispatch and office facilities in Melbourne, Australia. Due to tight differential settlement tolerance and geological conditions at the site, a bitumen slip layer was specified for the top 20 m of piles to reduce downdrag loads on piles supporting the Press Base. Once production piling commenced the rate of pile breakage became excessive and a significantly lower driving rate was measured for coated versus uncoated piles. This paper describes the results of detailed investigations, which were carried out to determine the cause of the lower driving rate of bitumen coated piles and the high degree of breakage. Details of altered construction procedures that were adopted to overcome the problem are also outlined.
|article #469; publication #37 (IC-1991-IT)|