Design of a High-speed Railway Hybrid Cabled-stayed Bridge with Main Span of 330 m
Research purposes:To meet the requirements of flood control and navigation,the Baihe Yujiang Special Bridge along the Nanning-Yulin High-speed Railway employs a(36+40+64+330+64+40+36)m steel box-concrete hybrid cabled-stayed bridge to cross the Yujiang River.The bridge is currently the largest high-speed railway ballastless track steel box-concrete hybrid cabled-stayed bridge under construction in China.This paper primarily presents the design and structural characteristics of the Baihe Yujiang Special Bridge,and explores the adaptability of laying ballast-free tracks on large-span steel-concrete hybrid cable-stayed bridges through various evaluation methods.The research provides a theoretical framework for the future construction of similar ballastless track bridges.Research conclusions:(1)The main bridge adopts steel box girder and concrete box girder,and cast-in-place concrete bridge panel on the top plate of steel box girder,which provides a good condition for laying ballastless track,and can control the shrinkage and creep deformation of the main beam in the later stage,which improves the adaptability of long-span bridge to ballastless track.(2)The Baihe Yujiang Special Bridge possesses excellent static performance and stiffness conditions.(3)The height of the track structure of the main bridge has been adjusted from 725 mm to 775 mm,reserving 20 mm and 30 mm of correction amounts for the base plate and the bedding plate,respectively.This provides a foundation for the subsequent graded construction and correction of the ballast-free track,enabling better integration of construction,gradually eliminating measurement errors,and enhancing the laying accuracy of the ballast-free track.(4)The linearity of the main bridge's ballastless track is analyzed using various adaptive evaluation methods,and the results consistently meet the design requirements.(5)The successful implementation of the bridge provides valuable experience for the construction of high-speed railway ballastless track bridges at home and abroad,and will further promote the technical development of high-speed railway ballastless track long-span bridges.
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