Advances in concrete construction

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An innovative geometry control method for short-line match precast segmental bridges

  • Xuzheng Liu (School of Civil Engineer and Architecture, East China Jiaotong University) ;
  • Huibing Xu (China Railway Nanchang Group Co.,Ltd.) ;
  • Jianyang Yu (School of Civil Engineer and Architecture, East China Jiaotong University) ;
  • Wei Quan (School of Civil Engineer and Architecture, Huangshan University)
  • Received : 2021.07.13
  • Accepted : 2023.10.24
  • Published : 2023.08.25
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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.

Keywords

Acknowledgement

The authors would like to thank the Zhejiang Communications Investment Group Co., Ltd, which provided engineering background and supported this study. Additionally, the authors would like to extend our thanks to the China Research Institute of Highway Ministry of Transport and the CCCC First Highway Engineering Co., Ltd. The Project supported by the National Natural Science Foundation of China (Grant No. 51468019, 52068026), Natural Science Foundation of Jiangxi, China (Grant No. 20232BAB204070, 20232BAB204071) and the China Scholarship Council (Grant No. 201609795003).

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