Construction Control of Luoshui Bridge on Wuhan Guangzhou Passenger Dedicated Railway

The Luoshui Bridge is located on Wuhan-Guangzhou Passenger Dedicated Railway.The main bridge of the bridge over the Luoshui River is a 3-span prestressed concrete continuous girder bridge with span arrangement(48+80+48) m and the main girder is constructed by the cantilever segmental concreting method.On the deck of the bridge,the ballastless tracks are laid and the designed traveling speed is 350 km/h.Owing to the restricted adjustment capacity of the fasteners for the ballastless tracks,the alignment control of the completed bridge of a long span high-speed railway continuous girder bridge is more demanding as compared to that of a common continuous girder bridge.To ensure that the alignment of the Luoshui Bridge can eventually conform to the design requirements,the finite element software Bridge Doctor is used to simulate the construction process,to predict the construction pre-cambering according to the deformation and mechanical behavior of the bridge and to monitor the alignment and force conditions of the bridge in the construction process and in the completion state.The results of the control show that the alignment of the bridge in either the construction process or the completion state is smooth,the differences of elevation of the main girder at the closure gaps are less than 10 mm,the force conditions of the main girder are good and can meet the goal set in the control.