Construction Techniques for Continuous Rigid Frame of Main Bridge of Chenhu Hanjiang River Bridge

The main bridge of Chenhu Hanjiang River Bridge is a continuous rigid frame bridge with span arrangement(102+168+102) m.The superstructure of the bridge is the single-cell single-box girder with variable depth and variable section and the substructure has round ended thin-wall twin piers supported on bored pile foundations.The holes of the bored piles for the main bridge were bored by the rotary boring machines and the pile caps were constructed in the steel sheet pile cofferdams.The segments No.0 of the superstructure were constructed on the scaffolding while the rest of the segments were cantileveredly cast in situ by the diamond-shape form travelers.At the closure gap at the central span,the 4 000 kN horizontal pushing force was applied to fulfill the closure of the span.To ensure the construction quality and safety and to keep the actual status of the bridge to approach the design status to the maximum extent,the closure precision of the closure gap was made to accord with the requirements in the codes and the geometric shape of the completed bridge was made to meet the design status through the construction monitoring and control.