Study on Key Technology of Assembling Installation of Long-Span Composite Girder Cable-Stayed Bridge

Abstract

The Nanxi (Xianyuan) Yangtze River Bridge in Yibin is a composite beam cable-stayed bridge with twin towers and double cable planes and a main span of 572 m. The superstructure is erected by the assembly method. In order to ensure the precise installation and control of internal forces for steel girders and bridge deck slabs of composite beams while also considering the construction efficiency of composite beams, a control method for the installation and erection of the superstructure has been proposed. This method is based on optimizing the internal force and geometric states of segments throughout the entire process, achieved by establishing finite element calculation models for both the full bridge and segmented sections and combining these with comparative studies of on-site monitoring data. With the installation stress and precision of composite beams properly controlled, construction efficiency has been enhanced through the optimization of the pouring process for wet joints between steel girders and concrete bridge deck slabs, as well as the tensioning process for stay cables. The equivalent tension method is applied to the tension process of the stay cable, thus ensuring the uniformity of the cable force of the steel strand. The relevant conclusions are applicable to the same type of composite girder cable-stayed bridge erection construction.

Keywords

cable-stayed bridge / composite beam / erection method / steel strand cable / equivalence tensioning method

References

[1] Ministry of Transport of the People's Republic of China JTG/T 3365-01-2020 Specifications for Design of Highway Cable-stayed Bridge. 2020.

[2] Sichuan Highway Planning Survey Design and Research Institute Ltd Yibin Nanxi Yangtze River Highway Bridge construction drawing design document ; 10/2015 2015.

[3] Shan, D.; Zhang, X.; Gu, X.; Li, Q. Cable Force Adjustment for Long Span Cable Stayed Bridge Based on Multilayer Perceptron Deep Learning. Bridge Construction 2021, 51, 14-20.

[4] Wei, L.; Cao, M.; Cui, B.; Xiong, W. Study of Construction Method for Installing Superstructure of Wangdong Changjiang River Highway Bridge. Bridge Construction 2019, 49, 119-124.

[5] Zhang, Y.; Li, Q.; Tang, L. Study on Cable Force Control of Zhumba Jinsha River Bridge in Yibin. Railway Standard Design 2005, 27-30, doi: 10.13238/j.issn.1004-2954.2005.08.011.

[6] Yuan, R.; Qin, S. Application of Unstressed State Method to Construction of Steel Strand Stay Cable. Bridge Construction 2012, 42, 75-79.