Integration of quality control and base improvement in auger piles

摘要

Given the correct conditions, open-hole cast in-situ auger piles can be a simple, quick and inexpensive piling solution. These advantages are unfortunately diminished by uncertainties with regards to the transfer of stress from the base of the pile into the in-situ soil or rock. As newer, more powerful, auger rigs become available, it becomes economically feasible to install auger piles into ever more competent rock. To fully utilise the capacity available in this rock, a methodology is required to ensure a clean contact at the base of the pile. Recent tightening health and safety legislation has eliminated the traditional method of hand cleaning and inspecting the base prior to casting the pile. As such, alternative methods are required which will guarantee this 'clean' contact and still maintain the simple and economical nature of open-hole auger piles. This paper explores potential methods of improving the performance of such piles in compression, tension and shear, with specific reference to piles installed for the 2010 Soccer City Stadium. A range of integrated quality control and base improvement methods are proposed in the hope that these can further improve the value of this pile type.