福厦铁路厦门北站“桥建合修”地道桥设计

Design of Underpass Bridge of Xiamen North Station on Fuzhou-Xiamen Railway

福厦铁路厦门北站是一座现代化综合性交通枢纽,该车站地道桥下方跨越地铁,中部为车站横通道,顶面为行车道和站台,建筑结构柱也置于地道桥之上,结构关系非常复杂。在采用常规框架式地道桥无法满足建筑布局及交通规划等方面要求的情况下,该地道桥设计创新地采用了8座刚架桥与站台板及路基支挡结构组合的方式,实现了其功能需求;并在结构设计上采用刚架桥墩与建筑结构柱合二为一,即"桥建合修"的方式,实现了建筑布局的协调统一;同时,通过梁柱分离、中墩铰接、边墩设竖向预应力、承台间设系梁等构造方式,巧妙地解决了结构受力方面的一些问题;在景观设计上也融入了一些思考和应用。文章以该地道桥设计为例,介绍了在站房、地铁等复杂边界条件下地道桥设计需考虑的因素,以及在结构选型、结构设计方面的创新运用。

Xiamen North Railway Station is a modern integrated transport hub on Fuzhou-Xiamen railway,the underpass bridge in the station underneath crosses the subway,in the middle is the cross aisle,and on the top surface is the traffic lane and platform,the building structural columns are arranged on the underpass bridge too,the structure relationship is very complex.In the cases of conventional frame underpass cannot satisfy the requirement of building layout or traffic planning or other aspects,the underpass bridge design adopts the way of eight rigid frame bridges in combination with platform boards and subgrade retaining structures innovatively to achieve its function demand;and makes building struc-tural columns and rigid frame bridge pier into one,namely the ＆quot;combining bridge and buitding construction together＆quot;in structural design to achieve the harmonization of building layout;at the same time,through the ways such as separating the beam and column,setting hinged middle pier,vertical prestress in side pier,tie beams between the pile caps and other methods,solves some problems in the structure stress cleverly;and some thinking and applications are also blen-ded in landscape design.Taking the underpass bridge design as an example,this paper introduces the underpass bridge design factors to be considered under the conditions of station,subway and other complex boundary ,as well as innova-tion in the structure selection and structural design.