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.
Highlights
Underground space development for urban regeneration and sustainability in metropolitan areas has been a focus area for researchers in recent years [1]
The bearing capacity of the expile increased by 20.88% compared to that of the conventional panded steel pipe pile increased by 20.88% compared to that steel pipe pile
Hydraulic equipment was developed for expanding steel pipes in the ground to apply the expanded steel pipe pile to the field
Summary
Underground space development for urban regeneration and sustainability in metropolitan areas has been a focus area for researchers in recent years [1]. Waveform micropiles negate the benefits of using micropiles as support members, which can be quickly constructed in a narrow space with minimal impact on the ground environment. The manufacturing cost of micropile with joints was higher than that of conventional support members, which can be quickly constructed in a using narrow space with minimal micropiles. (expansion) shapes (i.e., shear keys) by expanding smaller using a waveform micropile This is because micropile with joints inthe steelthan pipe,that which increases the end bearing capacity and skinafriction force. Figure 1), micropile the diameter creased frictional micropiles resistance in the shape of the joints, whereas inof the expanded steel pipeby pile increases at the jaw
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