Research on the Temporary Support Method for Construction of Extraverted Main Pylon of Huaihe River Bridge
During the construction of the upper pylon of an extraverted short-pylon cable-stayed bridge,before the stayed cables are tensioned,the upper pylon generates a large bending moment at the root of the pylon due to its own weight The setup of temporary support is an effective way to improve the bending moment at the root of the pylon.Taking the Huaihe River Bridge as the background project,the temporary support method for the construction of extraverted pylon is introduced,and a finite element analysis model is established.The stress performances of pylon under different support methods are compared and analyzed.The results show that in the unsupported state,the tensile stress at the root of the pylon is larger.By setting up the temporary support between double-limb extraverted pylons,the tensile stress at the root is significantly reduced.By comparing the two different methods of steel pipe support and opposite-pull cable,the opposite-pull cable method can actively control the stress of the pylon by adjusting the cable force,and the connection with the main pylon is simpler.Therefore,the opposite-pull cable method is adopted in this project.
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