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Số người truy cập: 107,089,107

 Bidirectional load test for large bored piles of Cua Dai bridge
Tác giả hoặc Nhóm tác giả: Do Huu Dao, Ha Hoang Viet Phuong, Nguyen Minh Hai, Anand J. Puppala, Surya S. C. Congress, Young Sang Kim, Tran Quoc Thien

Nơi đăng: The 3rd Int. Conf. on Transport Infrastructure & Sustainable Development (TISDIC 2019). Construction Publishing House.; Số: ISBN: 978-604-82-2893-4;Từ->đến trang: 83-91;Năm: 2019
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
This paper presents a case study of the loading test for Cua Dai bridge (Tra Khuc river, Quang Ngai, Vietnam). The bridge, measured 1.876,8m in bridge length, and 2.500m in total length. With two abutments and 37 piers supported by a number of 470 reinforced-concrete bored piles with the diameters of 1200mm and 1500mm for approaching spans and main spans, respectively. The engineers had to deal with a hard-working condition when testing the bearing capacity of the bored piles in a large off-shore area, especially the safety and potential damage from the upcoming flood season in Vietnam. Hence, the self-balanced Osterberg was employed to carry out the loading test for the D1200-mm piles (for piers T6 and T30) and D1500-mm piles (for piers T19, T20, and T21) at the maximum testing load 13 MN and 18 MN, respectively. Finally, the test could effectively determine the sleeve resistance and tip resistance of the reinforced-concrete bored piles, reaching up to 35MPa and 9 MN, respectively. As the result, the Osterberg testing method did help reduce the constructing time of the understructure parts.
Keywords: Loading test, sleeve resistance, tip resistance, Osterberg test, load box

ABSTRACT
This paper presents a case study of the loading test for Cua Dai bridge (Tra Khuc river, Quang Ngai, Vietnam). The bridge, measured 1.876,8m in bridge length, and 2.500m in total length. With two abutments and 37 piers supported by a number of 470 reinforced-concrete bored piles with the diameters of 1200mm and 1500mm for approaching spans and main spans, respectively. The engineers had to deal with a hard-working condition when testing the bearing capacity of the bored piles in a large off-shore area, especially the safety and potential damage from the upcoming flood season in Vietnam. Hence, the self-balanced Osterberg was employed to carry out the loading test for the D1200-mm piles (for piers T6 and T30) and D1500-mm piles (for piers T19, T20, and T21) at the maximum testing load 13 MN and 18 MN, respectively. Finally, the test could effectively determine the sleeve resistance and tip resistance of the reinforced-concrete bored piles, reaching up to 35MPa and 9 MN, respectively. As the result, the Osterberg testing method did help reduce the constructing time of the understructure parts.
Keywords: Loading test, sleeve resistance, tip resistance, Osterberg test, load box
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