跨站场咽喉区桥梁改建方案设计及施工技术研究

Research on Design and Construction Technology of Overpass Reconstruction Crossing the Throat Area of Railway Station

随着城市建设快速发展,受规划限制,对既有立交桥进行拓宽改造成为治理车辆拥堵、缓解交通压力的优选。而上跨铁路站场及咽喉区的立交桥,因其地理位置的特殊性成为改造设计和施工的难点。本文以上跨站场咽喉区跨线桥改造为例,本着不中断铁路运营、兼顾既有地貌及周边环境的原则,在考虑设计方案经济合理性的同时,统筹考虑施工方法的适应性及安全性。经方案比选采用步履式多点连续顶推法施工,顺利完成了对既有桥梁的改造,同时证明了改造设计方案的科学合理性。

With the development of the city construction,the widening projects of the existing overpass has become the best choice to tackle the traffic congestion and relieve the traffic pressure,especially,widening overpasses crossing the throat area and railway stations has become a difficulty in reconstruction design and construction due to its special geographical location.This paper takes widening the overpass crossing the throat area above railway station as an example,based on the principle of not interrupting the railway operation and considering the existing landform and surrounding environment,considered not only the economic rationality of the scheme,but also the adaptability and safety of the construction method during designing.After the scheme comparison and selection,the transformation of the existing bridge is successfully completed by incremental launching method,and the scientific rationality of the reconstruction design scheme is also proved.