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| Research on Temperature Span of Ballastless Track on Large － span Concrete Bridge |
| CUI Li － hong，Guo Fu － an，JIANG Zhong － gui，LIU Zeng － jie |
| The Engineering Management Center of MOR，Beijing，100844，China |
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Abstract Research purposes: Laying the ballastless track and seamless track on the large is one of key technologies for construction of the passenger dedicated line in China and it is of a serious challenge to the bridge construction and laying ballastless track． It is a problem whether the rail overlapping device is installed or not in design of the seamless track on the large － span concrete bridge． This paper discusses the design of the ballastless track and seamless track on the large span concrete bridge．
Research conclusions: From the research on design of the ballastless track and seamless track on the large span concrete bridge and the investigation of service situation of the existent seamless track on the large concrete bridge，the following points can be concluded: ( 1) If the track temperature span of large concrete bridge with the ballstless track exceeds the certain range，the disease will happen to the track structure． ( 2) The maximum longitudinal additional force of the rail and the load on the track structure can be reduced by cutting the longitudinal resistance of the rail fastening on the bridge by using the fastening with small resistance on the bridge． ( 3) The loads on the rail and the bridge pier and the deformation of the bridge structure increase obviously with the increase of the temperature difference of the bridge．( 4) The monitoring of the seamless track on the large span bridge and the experimental research on the design parameters of the seamless track have to be strengthened．
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Received: 03 May 2012
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2012, Vol. 29 
