Project description
It took 22 days to complete the conversion of the 46# and 47# bridge systems in the first phase of the Hang-An Expressway.
During the lifting period, a total of 61 trips were lifted, and the trips were automatically monitored and reported 61 times. The total length of the bridge in the jacking section is 159 meters, and the total jacking weight is about 9,290 tons. The construction of large-tonnage bridge jacking is the first time in Qingdao. The maximum height of the bridge jacking is 5.8 meters, which is the highest in the province. After jacking, the longitudinal slope of the bridge changed from 0.64% downhill to 2.76% uphill.
Through TorcStark PLC synchronous jacking equipment, the synchronous control of multiple jacks is realized, ensuring the bridge jacking posture, and solving the problems of large jacking stroke, long jacking process time, large number of jacks and other equipment, and difficult control. It also solves the construction problem that the superstructure is in a suspended state for a long time. The stability of the bridge support system during the jacking period is ensured by setting the longitudinal and transverse position limiting devices of the bridge. By using a mechanical lock hydraulic jack with a ball head angle on the top, the offset of the force axis caused by the change of slope is automatically adjusted. A number of measures ensured the safe and smooth implementation of the jacking.