Hybrid Bored Prestressed Concrete Cased Piles: Equipment and Construction Procedures
Publication: Journal of Construction Engineering and Management
Volume 144, Issue 12
Abstract
To widen the applications of large-diameter prestressed high-strength concrete (PHC) piles to stiff strata, this paper introduces a novel hybrid piling technique, including the equipment and construction procedures. The spiral drilling operation provides space for simultaneously lowering the piles, and the detected real-time parameters characterizing the construction status can be also automatically transferred to additional exciting force or constraints acting on the piles by a sophisticated feedback loop. The application of the proposed technique is verified with two large-diameter test piles installed into stiff weathered granite. It is experimentally demonstrated that, taking advantage of the unique grouted gap between the piles and the bored hole, the pile–strata adhesive strength and therefore the shaft resistance of the pile are significantly enhanced. Comparison of the tested piles shows that the trade-off relation between the grout quality and the modulus reduction of the strata plays an important role in controlling the bearing performance of the piles because the shaft resistance does not always increase with the modulus of the surrounding strata if the strength of the grouted interface is relatively small. The findings can provide fundamental guidance for further optimization of the proposed technique from the aspects of both design and construction.
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Data Availability Statement
All data generated or analyzed during the study are included in the published paper. Information about the Journal’s data-sharing policy can be found here: http://ascelibrary.org/doi/10.1061/(ASCE)CO.1943-7862.0001263.
Acknowledgments
The authors acknowledge the support from National Nature Science Foundation of China [NSFC (51608139 and 51678171)], the Peal River S&T Nova Program of Guangzhou (201806010095), the Science and Technology (S&T) Program of Guangzhou (201604016021), the China Postdoctoral Science Foundation (2016M592471), and the Department of Science and Technology of Guangdong Province (2015B020238014).
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©2018 American Society of Civil Engineers.
History
Received: Dec 12, 2017
Accepted: Jun 27, 2018
Published online: Oct 10, 2018
Published in print: Dec 1, 2018
Discussion open until: Mar 10, 2019
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