立交区匝道多联多跨桥梁施工技术

Construction Technology of Multi-Span Bridge on Ramp in Interchange Area

立交区匝道桥梁其线形结构一般由直线段、曲线段和结合段组成,为控制投资,设计时针对不同线型选择不同桥型,直线段一般选用T型预制梁,而曲线段和结合段一般选用现浇箱梁,现浇箱梁主要运用在变截面和曲线半径较小的桥梁中。以江通高速雄关互通M匝道不同类型桥梁施工为例,探讨多类型组合桥梁的施工顺序和工艺特点,重点阐述施工程序和施工过程中的关键技术控制。

The linear structure of ramp bridge in interchange area generally consists of straight section,curve section and joint section.In order to control investment,different bridge types are selected for different line types in design.T-shaped prefabricated beam is generally used for straight section,while cast-in-situ box beam is generally used for curve section and joint section.Cast-in-situ box girders are mainly used in bridges with small cross-section and curve radius.Taking the construction of different types of bridges on M-ramp of Xiongguan Interchange in Jiangtong Expressway as an example,the construction sequence and process characteristics of multi-type composite bridges are discussed,with emphasis on the construction procedure and key technology control in the construction process.