Publication Abstract




SuperPile 2017 Online Proceedings, (DFI)

Research Needs for Safe Lifting and Handling of Rebar Cages for Drilled Shafts
Vincent A Siefert, P.E., and Ahmad Itani, P.E., Ph.D

Rebar cages for Cast in Place Drilled Shafts (CIDH) are typically the longest and heaviest on the jobsite and their behavior is notoriously difficult to predict. As the popularity of these deep foundation elements increases, so do the challenges to safely lift and handle the prefabricated reinforcing steel elements. The fabrication and erection of these cages are generally based on experience and rule of thumb practices of the suppliers, fabricators and contractors. However several recent collapses have exposed the shortcomings of these techniques and have demonstrated the need to perform research and establish scientific methods to safely lift and handle CIDH rebar cages. This presentation will introduce the audience to the past, present and future research needed to properly engineer internal bracing and added bars, incorporating safe lift planning and rigging, temporary support systems and installation procedures, as well as analysis and design methods for these flexible elements that best resemble structural "wet noodles."


 article #2697; publication #1031 (SP-2017)