Key Techniques for Construction of Zhijing River Concrete-Filled Steel Tube Arch Bridge

Zhijing River Bridge is a concrete-filled steel tube deck arch bridge with a main span 430 m.The construction of the C20 massive concrete for the arch seats of the bridge was carried out in winter season.To prevent the possible thermal cracking in the concrete,the mix proportioning for the concrete was rationally selected and the thermal and humid isolation measures using the two layers of textures and three layers of membranes were taken.For the erection of the main arch ribs of the bridge,the cable hoisting construction method without utilization of scaffolding and tower bents was used.The C50 micro-expansion concrete for the steel tubes of the arch ribs was symmetrically cast by pumping by a single pipe.The final smooth completion of the bridge indicates that the construction schemes applied to the bridge are feasible.