Ballastless Track Surface Elevation Control Techniques for High-Speed Railway Cable-Stayed Bridge
The main bridge of Anhai Bay Bridge carrying a portion of Fuzhou-Xiamen High-speed Railway is a two-pylon,steel-concrete composite girder,cable-stayed bridge with a main span of 300 m,two spans of 135 m and two spans of 40 m.The stay cables are arranged in double cable planes.The erection accuracy control for the main girder and ballastless tracks of the long-span high-speed railway cable-stayed bridge is quite challenging,and the track elevation after the completion of the bridge is prone to surpass the limit.The causes of track elevation bias were analyzed via on-site measurement and theoretical calculation,and the over-thick waterproof layer of the concrete deck and the simulated weight errors of track slab were considered the two main causes.The effects of different measures on the main girder alignment were analyzed,including stay cable tension adjustment,applying loads and deloading on deck.It was determined to slightly adjust the tensions of 4 end pairs of stay cables to achieve the accurate tuning of the track elevation.The engineering practice proves that the measure proposed is economical and efficient.When the lower and upper alignment bias limits are controlled within 10 mm and 4 mm,respectively,the fasteners can be tuned to enable the alignment of the completed bridge meet the target.
万方数据
维普
