METHOD FOR LIFTING UPPER STRUCTURE OF BRIDGE

According to the present invention, disclosed is a method for lifting an upper structure of a bridge. A plurality of leveling devices and a plurality of hydraulic jacks are disposed between an upper structure and a lower structure of a bridge. The heights of the leveling devices are controlled. The hydraulic jacks are simultaneously operated to lift the upper structure of the bridge. The lifting distances of the hydraulic jacks are measured. The measured lifting distances are compared to adjust hydraulic pressure of the hydraulic jacks. According to the lifting method, the leveling devices are used to stable guide positions of the hydraulic jacks, and vertical positions of the hydraulic jacks are primarily adjusted to stably and precisely lift the upper structure of the bridge. Also, actual lifted distances of the upper structure of the bridge are measured by a height measurement device to compare the measured values and adjust the lifting amount, thereby stably, precisely, and simultaneously lifting using the hydraulic jacks.