大跨径变高度连续钢桁梁施工技术

Construction Technology of Continuous Steel Truss Girder with Large Span and Variable Height

下承式连续钢桁梁桥具有刚度大、高度低、稳定可靠等多重特点,已成为现代桥梁建设中较为主流的形式。但该形式节点及杆件数量较多,普遍存在相对复杂的连接构造关系,导致其易受到施工方法不合理的影响而出现质量问题,给出正确的下承式连续钢桁梁桥应用施工技术极具必要性。以某下承式道砟桥面钢桁梁架设工程为背景,探讨大跨径变高度连续钢桁梁施工技术和技术要点,以期起到抛砖引玉的作用。

Because of the characteristics of high stiffness, low height, stability and reliability, the bottom-type continuous steel truss bridge has become a more mainstream form in modern bridge construction. However, due to the abundant number of joints and bars, the type generally has a relatively complex connection structure relationship, which makes it easy to be affected by unreasonable construction methods and quality problems.Therefore, it is very necessary to apply the correct construction technology to the continuous steel truss bridge.Taking the steel truss girder erecting project of a bottom ballast bridge deck as the background, the construction technology of continuous steel truss girder with large span and variable height is discussed, and the technical key points in the construction are expounded, in order to play a role in attracting jade.