Construction method of variable cross-section viaduct with ramps: Fid-Bau Portal

Construction method of variable cross-section viaduct with ramps

KE JINHUI / JING CHENGQIAN / LI RUIXUE / ZHENG HUIFEN

The invention discloses a construction method of a variable cross-section viaduct with ramps, which comprises a main bridge pushing support structure, and the main bridge pushing support structure comprises a pushing temporary pier assembly, an assembling temporary pier assembly and a protection platform; the multiple pushing temporary pier assemblies are arranged at intervals in the transverse direction to form a roadway-crossing pushing temporary pier set, and every two adjacent pushing temporary pier assemblies in the transverse direction cross a roadway. The multiple sets of spliced temporary pier assemblies are arranged at intervals in the transverse direction to form a roadway-crossing spliced temporary pier set, and every two transversely-adjacent spliced temporary pier assemblies cross a roadway. The protection platform comprises longitudinal bearing beams and a supporting bridge deck, and the supporting bridge deck is located at the top of the traffic lane; the system further comprises a ramp pushing supporting structure. The temporary piers can be reasonably designed, smooth traffic of a lower roadway can be guaranteed, the line shape of an installation bridge can be guaranteed in the pushing process, and meanwhile the ramp installation work is reasonably arranged after smooth pushing in place.

本发明公开了一种具有匝道的变截面高架桥施工方法，包括主线桥顶推支护构造，所述主线桥顶推支护构造包括顶推临时墩组件、拼装临时墩组件和防护平台；若干组所述顶推临时墩组件沿横向间隔布置形成一组跨车行道顶推临时墩组，在横向相邻的两组所述顶推临时墩组件跨过一条行车道；若干组所述拼装临时墩组件沿横向间隔布置形成一组跨车行道拼装临时墩组，在横向相邻的两组所述拼装临时墩组件跨过一条行车道；所述防护平台包括纵向垫梁和支撑桥面板，所述支撑桥面板位于行车道的顶部；还包括匝道顶推支护构造；能够通过合理设计临时墩并保证下部车行道的交通顺畅并能够在顶推过程中保证安装桥梁线形，同时在顺利顶推就位后合理安排匝道的安装工作。

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