新井口嘉陵江大桥四线铁路连续刚构设计关键技术

Key Design Technology of Continuous Rigid Frame for Four Railway Lines of Jialing River Bridge in Xinjingkou

以兰渝铁路重点控制性工程新井口嘉陵江大桥84m+152m+76m四线铁路预应力混凝土连续刚构桥为工程背景,从线路方案及桥位控制条件、桥跨布置方案、桥面布置型式及结构型式、多线桥梁车桥动力性能等方面进行了研究,提出了主桥四线并行、墩身上段及梁体分修、墩身下段及基础合修的新型结构型式及设计关键技术,可为同类型桥梁建造提供思路及参考。

Based on the engineering background of the pre-stressed concrete continuous rigid-frame bridge of four railway lines of Jialing River Bridge 84 m+152 m+76 m in Xinjingkou in the key controlling project of Chongqing-Lanzhou Railway,the article studies the line scheme,bridge site control conditions,bridge span layout scheme,deck layout type,structure type,multiline beam vehicle and bridge dynamic performances and etc.,and puts forward the new structural type and key design technology of paralleling four lines of the main bridge,separately maintaining the upper segment of pier and the beam,and maintaining the lower segment of pier together with foundation,which can be referred for the construction of the similar bridges.