大跨径钢混组合梁施工关键技术及控制要点研究

Research on Key Construction Technology and Control Essentials of Long-span Steel-concrete Composite Beam

大跨径梁式钢混组合梁,受力结构复杂,施工工序多且工艺复杂,施工实例少。详细分析了杭州绕城高速公路大桥大跨度梁式钢混组合梁施工过程中,钢混组合梁分段安装、顶升、多次叠合等关键施工技术,总结提出了钢梁精细化加工、精准安装落位和同步顶升,以及沉降、位移及变形控制等的施工关键控制要点。经实测验证,按相关技术控制的钢混组合梁整体高精度完成,相关指标符合设计文件及规范要求。

For the long-span steel-concrete composite beam,its stress structure is complex,its construction procedures are more and its technology is complex,but the construction examples are few.The key construction technologies such as the segmental installation,jacking and multiple superposition of steel-concrete composite beams in the construction process of long-span steel-concrete composite beams of the ring expressway bridge in Hangzhou are analyzed in detail.The key construction control points such as the fine processing,accurate installation and positioning,synchronous jacking,settlement,displacement and deformation control of steel beams are summarized and put forward.The actual measurement shows that the steel-concrete composite beam controlled according to the relevant technology is completed with high accuracy,and the relevant indicators meet the requirements of the design documents and specifications.