铁路转体V形桥墩跨越既有线的应用研究

近年来,我国铁路建设步伐正在加快,路网密度逐渐加大,立交位置越来越多,交叉关系日趋复杂,特殊桥墩成为解决铁路间小夹角立交问题的重要结构。以兰州至中川机场城际铁路上跨既有兰新铁路的立交关系为背景,通过分析两线间的平面和空间关系,结合现场地形地貌特征和桥下建筑限界要求,拟定V形桥墩方案,并为减小新线施工对既有铁路运营的不利影响,在墩底设置球铰进行转体施工,成功创造出一种构造新颖、外形美观、结构安全、工艺合理的新型桥墩,在国内铁路尚属首次应用,且自铁路开通以来V形桥墩运营状况良好。

Study on Application of Swivel V-shaped Bridge Piers Crossing Existing Railways

In recent years, railway construction in China is accelerating fast, road network is getting more density, the number of interchanges keeps increasing, and the interchanging relationship is becoming more and more complex. Thus, special bridge piers have become important structures for solving the problem of small angle interchanges between railways. This paper takes Lanzhou-Zhongchuan airport intercity railway crossing over the existing Lanzhou-Xinjiang railway as the background to analyze the planar and spatial relationships between two lines, combined with the site topographical features and the requirements of the building line below the bridge to develop a V-shaped bridge pier scheme. In order to reduce the adverse impact of the construction of the new line on the existing railway operation, a new type of bridge pier with novel structure, attractive appearance, safe structure and reasonable working process is developed by setting up ball joint at the bottom of the pier for swivel construction. The V-shaped pier is the first domestic application and has been operating well since the opening of the railway.