Construction Control of Laying Ballastless Track on Kilometer Long Joint Bridge of High Speed Railway
The bridge deck alignment of a kilometer level long joint large span bridge is prone to significant vertical changes under the influence of tower-beam-cable temperature fluctuations and load changes on the bridge.This article combined the construction of the Changqing Yellow River Bridge project on the Zhengzhou-Jinan railway to establish an integrated finite element model of the track-bridge system.The model was modified in real-time based on the actual temperature and bridge load at different construction stages,and an optimization scheme for alignment control technology was proposed to achieve high-precision construction of ballastless tracks on kilometer level long joint large-span cable-stayed bridges.The results show that using the corrected relative height difference to control the layout construction of the base slab can control the deviation of the entire bridge base plate within-10～10 mm.When calculating the relative height difference,the influence of the second phase dead load and the deviation between the actual construction temperature and the design temperature should be considered.By using the corrected absolute elevation to control the precise adjustment of the track slab,the deviation between the final measured alignment and the designed alignment can be controlled within-2.0～1.6 mm,and the temperature change during construction operation period of each span should not exceed 2℃.The 60 m chord midpoint chord measurement method was used to review the fine tuned rail surface alignment,and the maximum chord measurement value was measured to be 2.67 mm,which meets the specification requirements.
NETL
NSTL
万方数据
