地铁保护区域内立交桥建设关键技术研究

以某地铁保护区域内的枢纽立交为例，研究了此类立交的建设关键策略。从立交选型、桥梁孔跨布置、桥梁结构优化、路基填料设计、软基处理、框架墩盖梁施工、桩基施工等几方面进行了详细阐述。通过采取合理的设计及施工策略，成功解决了立交与地铁结构重叠、附加荷载超标、桩基施工期塌孔等关键问题，可为类似工程提供参考。

Study on Key Techniques of Overpass Construction in Protected Area of Metro

Taking a terminal interchange in a protected area of a metro as an example, the key strategies for the construction of such interchanges are studied. The selection of interchange, the layout of bridge span, the optimization of bridge structure, the design of subgrade filling, the treatment of soft foundation, the construction of frame pier bent cap and the construction of pile foundation are expounded in detail. By adopting the reasonable design and construction strategies, the key problems such as the overlapping of interchange and metro structure, the excessive additional load and the hole collapse during pile foundation construction are successfully solved, which can provide the reference for the similar projects.