Comparison and Selection of Arch-Rib Construction Schemes for Continuous Beamarch Composite Bridge of High Speed Railway

Abstract: The paper summarizes the four different construction schemes based on engineering cases for the arch rib construction of continuous beam-arch composite bridges for high-speed railways. These methods include in-situ assembly, segmental lifting, incremental launching and longitudinal moving, and vertical rotation. The temporary structural designs, process methods, and technological equipment for each construction scheme are described in detail. The advantages and disadvantages of each scheme and its application scope under various conditions are analyzed, and opinions and suggestions for guiding the application of each scheme are proposed. The comparison and selection analyses show that the four arch rib construction schemes have certain applicability under different conditions such as bridge site status, bridge span, and construction environment. With the continuous increase of bridge span and progress of construction technological equipment, the arch rib construction technology is developing towards the overall erection direction. This leads to more obvious technical advantages of the segmental lifting method, incremental launching and longitudinal moving method, and vertical rotation method. Therefore, it is necessary to select the best construction scheme according to the construction status and technical conditions during application.

Keywords: high-speed railway (HSR); continuous beam-arch composite bridge; arch rib; in-situ assembly; segmental lifting; incremental launching and longitudinal moving; vertical rotation