The main bridge of Lishui Haoxi river bridge is a 208-meter-span butterfly steel structure composite bridge,which is constructed by a cable hoisting method,the deck was constructed ahead of the arch.The steel arch system consists of main and secondary arch ribs,and their connecting rods and wind braces.The main beam lattice system consists of main longitudinal beams,beams and orthotropic steel bridge decks.In order to balance the thrust force of the steel arch system in the bridge state,an external replaceable cable tie bar is installed in each main longitudinal beam.Each lifting point is equipped with two galvanized parallel steel wire finished hanger cables,and the upper and lower parts are anchored by fork pin shaft.The finite element calculation results show that the forces of the main beam,arch rib and hanger cable all meet the requirements of code.
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