Pressure-Cast-In-Situ Pile with Spray-Expanded Frustum: Construction Equipment and Process
Publication: Journal of Construction Engineering and Management
Volume 147, Issue 6
Abstract
To make full use of skin friction of soils around pile, this paper presents a novel pile composed of ribbed plates, an expanded body with double frustum, and a pile body, named as the pressure-cast-in-situ pile with spray-expanded frustum. A multifunction auger drill is used to form the expanded body by spraying cement slurry rotationally at a given depth, pouring superfluid concrete, and vibrating and squeezing pile body. The ribbed plates are completed by spraying cement slurry fixedly with a hollow drill pipe. Due to the improvement of skin friction of the expanded pile body, the novel pile will get a large bearing capacity. Moreover, due to the squeezing effect of superfluid concrete during the pile construction, the soils around pile can be compacted, which also leads to an obvious increase in bearing capacity of the novel pile. The application of the proposed technique of the novel pile is verified by using static loading tests on three novel piles and one traditional cast-in-situ pile. Comparisons of the four test piles demonstrate that the ultimate bearing capacity of the novel pile increases by more than 45% under the condition of the same concrete consumption per unit volume. For practical purposes, the pressure-cast-in-situ pile with spray-expanded frustum is worthy of promotion due to the advantages of high bearing capacity and significant economic benefits.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (experimental data in the figure).
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 51778345 and 52078278), the Shandong Provincial Natural Science Foundation for Distinguished Young Scholars (No. JQ201811), the Key Research and Development Foundation of Shandong Province of China (No. 2019GSF109006), and the program of Qilu Young Scholars of Shandong University. Great appreciation goes to the editorial board and the reviewers of this paper.
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© 2021 American Society of Civil Engineers.
History
Received: Jul 15, 2020
Accepted: Dec 23, 2020
Published online: Mar 31, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 31, 2021
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