武汉市唐家墩立交节点设计形式探讨

武汉市脚家墩立交桥A匝道地铁车站节点，因受到地铁车站及剧边的构造物的限制，桥下不能设置桥墩。采用大跨度的钢横梁与A匝道钢箱梁连接，解决了因空间限制无法布置桥墩的问题。同时也解决了A匝道曲线钢箱梁支座设置及偏心受力的问题。Z78、Z79号双层框架桥墩还兼顺同时支撑主线桥的作川。这种设计方案为多层次立交工程提供了新的设计思路。

Discussion on Design form of Tangjiadun Interchange Node in Wuhan

For the subway station node of the ramp A in this project, pier cannot be set under the bridge because of the limitation of the subway station and surrounding structure, so the long-span steel beam connecting the steel box girder of the ramp A was taken into use. Thus the problem of space limitation in pier-layout could be solved, and the problem caused by the layout of curved steel box girder bearing and the eccentric force could also be solved. Moreover, the two-layer frame-type piers of the Z78 and the Z79 could support the main bridge at the meantime. This design scheme will provide new ideas for multi-level interchange project.