高速铁路大跨度节段预制拼装混凝土斜拉桥结构设计关键技术

Key Technology for Structural Design of Long-Span Segmental Precast Assembled Concrete Cable-Stayed Bridge on High-Speed Railway

新建广汕高速铁路增江特大桥主桥采用(48+84+260+84+48)m节段预制拼装混凝土斜拉桥,是国内、外首座采用节段预制拼装施工工法的高速铁路大跨度混凝土斜拉桥。不同于公路市政桥梁,高速铁路桥梁结构设计要点在于大桥刚度、线形控制需满足高速铁路列车运营要求。本文结合高速铁路大跨度预制拼装混凝土斜拉桥自身特点,从结构支承体系、主塔、斜拉索、主梁截面及其预应力束布置等方面,研究并总结了大桥的主要结构设计关键技术,可为类似工程设计提供参考。

The new-built Zengjiang super bridge of Guangzhou-Shanwei High-speed Railway with span(48+84+260+84+48)m is the first long-span segmental precast assembled concrete cable-stayed bridge in China and abroad.Differ from the bridge of municipal highway,the bridge’s key construction technology of high-speed railway is that stiffness and linear control of bridge must meet the requirements of high-speed railway operation.In combination with the characteristics of long-span prefabricated assembled concrete cable-stayed bridge of high-speed railway,the paper researched and summarized the key structural design technologies of the bridge in the aspects of structural bearings,bridge tower,stay cables,girder section and the prestressing cable distribution,and the results can been referenced for the similar engineering design.