Construction Technology for Railway Bridge Arch Rib Erection Using "Reverse Low Assembly and Large Segment Lifting"
The newly constructed single-line Zhengpugang Railway Station Niutunhe Grand Bridge has a small clear span between the arch ribs and crosses an existing highway.Traditional assembly methods,which assemble from both ends toward the middle("forward assembly"),present challenges such as crane positioning difficulties and the inability to lift the arch ribs in the central span after completing the assembly at both ends.The"reverse low assembly and large segment lifting"technique for erecting bridge arch ribs addresses these issues by using reasonable segment divisions and a reverse assembly sequence.This method reduces the impact of work surface constraints and significantly improves operational efficiency.Additionally,a real-time monitoring and warning system for controlling section displacement ensures continuous,synchronous lifting and precise closure,providing an information-based guarantee of safety and reliability.This approach can serve as a reference for similar bridge construction projects in the future.
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