Design of Cable-Stayed Cantilever Casting System for Arch of Tianchikou Qingjiang River Bridge in Changyang County
The main bridge of Tianchikou Qingjiang River Bridge in Changyang County is an asymmetric deck-type reinforced concrete arch bridge.The arch,spanning 242 m,is of single-cell box cross-section,measuring 9.5 m wide and 4.0 m deep.The two halves of the arch on Ziqiu side and Wufeng side were composed of 24 and 21 segments,respectively.Except the segment No.1 that was cast on scaffolds,the remaining arch segments were all cast using a cable-stayed cantilever casting system.The forestays and backstays were radiated out from the temporary towers,while the forestays and backstays connecting the transition piers and arch were in fan arrangement,and these stays were designed as continuous stays,to save the installation of traditional stay tensioning platform.The two temporary towers rose 52.68 m and 60.12 m,respectively,each consisting of 8,φ800 mm×16 mm steel pipes.The rock-anchored stays with 800 kN capacity each for the cable-stayed cantilever casting system were designed considering the maximum tensions of the stays.The cable-stayed cantilever casting system was simulated in MIDAS Civil to determine the stays that would be demolished and adjust tensions of stays.During construction,the maximum cross-sectional tensile stresses in the arch,the maximum displacements of the temporary towers,and the geometry of the completed arch met the requirements.
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