铁路斜拉桥板-桁组合结构主梁及其施工方法

PLATE-TRUSS COMPOSITE STRUCTURE OF RAILWAY CABLE-STAYED BRIDGE AND ITS CONSTRUCTION METHOD

通过分析总结国内外铁路斜拉桥工程实例,提出了适合大跨度铁路斜拉桥受力特点的板-桁组合结构新型主梁,及其便捷的施工方法。新型钢板(箱)-钢桁组合结构,桥面板系统承受斜拉桥主要的轴向压力,钢桁架提供铁路桥梁所需的刚度,截面效能得以充分发挥。组合结构主梁分两阶段成桥,整体板结构整体制造、运输,并在斜拉桥体系中先行吊装成桥,而后在其上拼装钢桁梁构件,使拼装的安全与效率得到极大的提高。

In order to study and propose an innovative structure that is applicable for large-span railway cable-stayed bridge and convenient construction method,this paper analyzed and summarized domestic and international railway cablestayed bridge engineering projects. The innovative steel plate（ box）-truss composite structure,in which the bridge deck system bears the primary axial compression of the cable-stayed bridge,and the steel truss stiffens the railway bridge,can make full use of the effectiveness of cross-section performance. The composite structure can be divided into two stages.Firstly, the overall deck structure of steel orthotropic plate is manufactured and transported, and then lifted and constructed. Secondly,the steel truss members are assembled on the bridge deck system,which improves safety and efficiency remarkably.