Construction Monitoring Techniques for Superstructure of Yingwuzhou Changjiang River Bridge in Wuhan

The main bridge of the Yingwuzhou Changjiang River Bridge in Wuhan is a three-tower steel and concrete composite girder suspension bridge with span arrangement (200+2×850+200) m. To ensure that the geometric shapes and structural force safety of the bridge at the completed bridge stage could meet the design requirements, for the erection of the main cables of the bridge, the influence formula for the midspan location parameters of the datum strands considering the influences of the temperatures, span length and tower top elevation was provided. The general strands of the cables were erected, using the technique of positioning the strands in layers. The calculations of the unstressed cutting length of the suspenders were checked mutually, using the two means of the forward installation and inverse removal calculation. The segments of the stiffening girder were hoisted and installed, using the 4 cable-supported cranes in the sequence starting form the vicinity of the middle tower of the two central spans and then from the side towers to the side piers and midspan of the bridge. The concrete deck slabs were constructed in a way of precasting the slabs in factory and making the slabs and steel girder composite on the bridge in field. At the time all segments of the stiffening girder were installed in place and the segments were well connected, the concrete wet joints were cast. After each 27 segments of the stiffening girder of the two central spans were hoisted and installed, the tower saddles were then pushed in place in 6 times. With the application of all the monitoring techniques mentioned above, the geometric shapes and the offsetting of the towers of the bridge at the completed bridge stage could meet the design requirements. © 2018, Journal Press, China Railway Bridge Science Research Institute, Ltd. All right reserved.