Proceedings from the Michael W. O'Neill ACIP Pile Sessions of the 83rd Annual TRB Meeting 2004: Recent Experiences & Advancements in the US and Abroad on the use of Auger Cast-in-Place Piles, (DFI)
The Development of ACIP Piling Systems and Equipment and the new B- Tronic Quality Control System
Wolfgang G. Brunner
The installation of piles with CFA (continuous flight augers), partial or full displacement augers is a method to install high quality piles vibration free with high performance of any kind of soil without boulders or other obstructions. In order to combine a fully cased hole with the advantage of CFA bored piles double rotary drives can be used for small or even large diameter piles. The consistence of the concrete allows the reinforcement cage or steel profile be pushed in or inserted with the help of a top vibrator. Beside these systems the MIP (mixed in place) system is widely used in suitable soils like sand, gravel with low fine content without boulders or other obstructions. The reinforcement cage or steel profile is either pushed down into the concreted borehole or inserted with the help of a top vibrator. Since the soil is mixed with aggregate like cement slurry pumped through the stem of the auger no excavation material need be carried away from the borehole. This system is very much liked because of its economical competitiveness as well as the possibility to work in contaminated soils without excavating the soil. The new B- Tronic is an electronic system to control, monitor, and visualize all operational processes associated with drilling activities carried out by specialist Bauer foundation equipment. Touch screen monitors, microcomputer units display during operation all relevant data. All data generated by the B- Tronic can either be used to display a data log, to print out in the operators cab or transmitted to the site office or direct to the head office via data transfer.
|article #228; publication #71 (MWO-2004)|