English：

Based on the reconstruction and expansion project of an expressway, a new integrated construction method of fully prefabricated rigid frame bridge is proposed,which solves the problem of the mismatch of work efficiency of everyworking face in the conventional integrated bridge erecting machine and the problem of long construction period in the traditional process. This method realizes the rapid construction of this type of bridge in highly urbanized areas. In this process, the new integrated bridge erecting machine is used to synchronously install precast segmental beam, pier top block and pier column. At the same time, precast segmental beams near the middle pier are installed by the conventional cantilever assembly method, and the installation method of the precast segmental beams near the transition pier is optimized from the half span suspension assembly method to the cantilever assembly method by temporarily fixing the pier top block and arranging temporary prestressed tendons. This new integrated construction method improves the construction efficiency from 39. 5d / unit to 32d / unit, and reduces the interference to traffic and environment.