复杂地形下航站楼前高架桥上下部结构选型与设计

Selection and Design of Upper and Lower structures of the Viaduct in Front of Terminal Building under Complex Terrain

某机场改扩建工程位于地形起伏较大的高烈度山地区域,进出场高架桥基础处于高边坡回填土上,楼前高架桥下小角度跨越三条地铁线路。桥梁基础的可布置空间较少,同时施工方案影响桥梁方案,研究并选择合理的桥梁上下部结构方案十分必要。文章根据地形地貌和地质条件,并结合轨道交通线路的综合研究,选择合理的孔跨布置,进而确定几种可行的梁型墩型,再从安全、美观、施工等方面对上下部结构进行比较分析,推荐合理的墩梁类型。该桥梁上下部结构的对比研究可为同类型桥梁工程设计提供参考。

An airport reconstruction and expansion project is located in a high-intensity mountainous area with large undulating terrain.The foundation of the viaduct in and out of the airport is on the backfill of the high slope,and the viaduct in front of the building crosses three subway lines at a small angle.The layout space of the bridge foundation is less,and the construction scheme affects the bridge scheme.It is necessary to study and select the reasonable scheme of upper and lower structures of the bridge.According to the topography and geological conditions,combined with the comprehensive study of rail transit lines,this paper selects a reasonable hole span arrangement,and then determines several feasible types of beams and piers.Then,it compares and analyzes the upper and lower structures from the aspects of safety,aesthetics and construction to recommend reasonable pier and beam type.The comparative study of the upper and lower structures of the bridge can provide reference for the design of similar bridge engineering.