Slip-Form Application to Concrete Structures
Publication: Journal of Construction Engineering and Management
Volume 134, Issue 3
Abstract
Because of superior speed and productivity, slip forms were extensively utilized as a potential formwork candidate in constructing concrete structures for the past few decades. Typical projects that employ this formwork technique are: Core of high-rise buildings, silos, telecommunication towers, cooling towers, heavy concrete offshore platforms, etc. The research presented in this paper aims at studying slip-form application to cores and silos, assessing its productivity, and determining its appropriate speed as well as auxiliary resource combinations. Simulation models are developed in which the potential control units in a slip-form system are described for cores and silos. Data are collected from several case study projects. A set of charts has been developed to predict productivity considering different stoppages, core cross section area, slipping (jacking) rate, and concrete placing methods. These charts play an essential role in managing slip-form application to cores and silos. Results show that the developed simulation models predict the productivity of case study projects with 99.70 and 99.30% accuracy for cores and silos, respectively. The presented research is relevant to both researchers and practitioners. It provides practitioners with charts that assist in scheduling and managing the required resources for slip-form application. In addition, it provides researchers with simulation models and framework for implementing slip forms to core and silo construction.
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Acknowledgments
The writers would like to extend their appreciation to Scanada Slip-Form Company, particularly Mr. Hans Vikstrom, the director of Montréal branch for his great help and professional advice in the presented research. In addition, special appreciation would be extended to Samarah Construction Co., particularly Mr. Ahmad Keshavarz (project engineer), project manager, and construction manager of Hormozghan cement factory project for their great cooperation in the presented research.
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© 2008 ASCE.
History
Received: Feb 17, 2006
Accepted: Jun 8, 2007
Published online: Mar 1, 2008
Published in print: Mar 2008
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