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Advances in Concrete Construction Volume 16, Number 2, August 2023 , pages 79-89 DOI: https://doi.org/10.12989/acc.2023.16.2.079 |
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 open accessAn innovative geometry control method for short-line match precast segmental bridges |
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Xuzheng Liu, Huibing Xu, Jianyang Yu and Wei Quan
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| Abstract | ||
| The occurrence of unexpected horizontal offset in the instrument or target will result in accumulated horizontal deviation in segment alignment with traditional short-line match method. A geometry control method, the four-point method, is developed for precast segmental bridges to avoid the influences of unexpected horizontal offset. The concept of the four-point method is elucidated. Furthermore, the detailed instruments and instructions are introduced. Finally, the four-point method is validated through a practical engineering application. According to the survey data, after short-line match precast construction, the vertical deviations on both sides vary between -5 mm and 5 mm in almost all segments, and the horizontal deviations vary between -4 mm and 4 mm in all segments. Without on-site adjustment, the maximum vertical and horizontal closure gaps are 12.3 and 26.1 mm, respectively. The four-point method is suggested to alleviate the issues associated with relatively poor soil conditions in casting yard. | ||
| Key Words | ||
| four-point method; geometry control method; precast segmental bridges; short-line match; unexpected offset | ||
| Address | ||
| (1) Xuzheng Liu, Huibing Xu, Jianyang Yu: School of Civil Engineer and Architecture, East China Jiaotong University, No.808 Shuanggang East Street, Nanchang, China; (2) Xuzheng Liu: State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, China; (3) Huibing Xu: China Railway Nanchang Group Co.,Ltd., No.7 Zhanqian Street, Nanchang, China; (4) Jianyang Yu: Hangzhou Chengxing Detection Co.,Ltd., No.3 Hengxin Street, Hangzhou, China; (5) Wei Quan: School of Civil Engineer and Architecture, Huangshan University, No.39 Xihai Street, Huangshan, China. | ||
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