Development of Expanded Steel Pipe Pile to Enhance Bearing Capacity

Junghoon Kim, Uiseok Kim, Byungchan Min, Hangseok Choi and Sangwoo Park
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Junghoon Kim: School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Korea
Uiseok Kim: School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Korea
Byungchan Min: Samho Engineering Corporation, Gwacheon 13814, Korea
Hangseok Choi: School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Korea
Sangwoo Park: Department of Civil Engineering and Environmental Sciences, Korea Military Academy, Seoul 01805, Korea

Sustainability, 2022, vol. 14, issue 5, 1-16

Abstract: An expanded steel pipe pile increases the cross-sectional area of conventional micropile by expanding the steel pipe to exhibit a higher bearing capacity owing to increased frictional resistance. However, construction cases of the expanded steel pipe pile are insufficient due to the absence of equipment for expanding steel pipes inside the ground. In this study, hydraulic expansion equipment was developed to verify the reinforcing impact on the bearing capacity and field applicability of the expanded steel pipe pile. A series of laboratory and test bed experiments was conducted to measure the expansion time and deformation of carbon steel pipes by using the developed equipment. The results of these experiments demonstrated that the developed equipment has sufficient ability and constructability to be used in the field for constructing expanded steel pipe piles. Then, field load tests were performed by constructing expanded and conventional steel pipe piles to confirm the improved bearing capacity of the expanded steel pipe pile compared to that of the conventional micropile. As a result, the expanded steel pipe pile exhibited a 20.88% increase in bearing capacity compared to that of the conventional steel pipe pile.

Keywords: micropile; steel pipe pile; expanded steel pipe pile; bearing capacity of micropile; expansion equipment for steel pipe (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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