摘要
研究目的:在铁路枢纽建设中,新建或增建铁路下穿既有公路桥时,因其施工条件受限制,设计时需对影响既有桥安全因素做周详考虑,而成为重要的铁路工程问题之一,本文通过技术及经济等因素对渝涪线在重庆枢纽段下穿既有五童立交桥的方案进行比选,以减小不利因素对既有公路桥安全的影响,为设计者提供参考,为类似工程供提供借鉴。研究结论:一般情况下,对于新建或增建铁路下穿既有公路桥时,应综合经济、技术、安全等因素合理选取通过方案。能够将新建、增建铁路的建设对既有公路桥安全的影响减小到最低程度,是处理新建或增建铁路下穿既有公路桥工程问题的首要前提。渝涪线下穿五童立交采用桩板结构措施,充分利用端承桩基将上部荷载作用传递到基岩的工作机理,既保证了既有桥墩的安全,又保证了既有路基的稳定性。该方案将增建二线对既有公路桥安全的影响减小到了最低程度,为最佳方案。
Research purposes： During the construction of the railway terminal,when the new or additional railway under-passes the existing road bridge,the factors that affect the safety of existing bridges should be considered carefully in the design and the safety of the existing bridge becomes an important issue in the railway construction because the construction condition is limited.On considering the technical and economic factors,the design schemes for Chongqing-Fuling Railway under-passing the Wutong Overpass Bridge in Chongqing were compared and the best scheme was selected to reduce the negative factors that affected the safety of the bridge for the purpose of providing the references to the similar works. Research conclusions：In general,when a new or additional railway under-passes the existing road bridge,the scheme should be reasonably selected on consideration of economic,technical,security and other factors.Minimizing the impact of construction of a new or aditional railway on the existing road bridge is crucial to construction of a new or additional railway under-passing the existing road bridge.The pile-board structure was used for construction of Chongqing-Fuling Railway under-passing the Wutong road bridge to transfer the top load to the bed rock by the pile.In this case,the safety of existing bridge and the stability of the existing subgrade can be ensured.This scheme is the best one because of minimizing the impact of railway construction on the existing road bridge.
出处
《铁道工程学报》
EI
北大核心
2011年第4期27-31,共5页
Journal of Railway Engineering Society
关键词
铁路枢纽
既有公路桥
方案比选
railway terminal
existing road bridge
scheme comparison
