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组合结构以其优异的力学性能和对施工具有的良好适应性将在未来桥梁建设中占有越来越重要的地位,组合箱梁常常采用顶推法施工。杭州九堡大桥南引桥采用大悬臂的宽箱轻型槽形钢梁与预应力混凝土桥面板的组合箱梁结构,箱宽31.5m,悬臂超过8m,11跨一联,长910m,该结构体系是国内最宽的单箱组合梁。施工采用独创的“步履式”顶推施工法,工艺新颖:多点连续顶推,85m跨不设临时墩,顶推过程梁体属整体刚性平移,如此大跨径的顶推施工在国内尚属首次。本文研究了九堡大桥大跨长联钢槽梁的顶推施工工艺,并对顶推过程中结构关键受力点:钢槽梁与移位器的接触边界进行了计算分析,确定了合适的接触宽度。实践表明九堡大桥的顶推施工是非常成功的。
With its excellent mechanical properties and good adaptability to construction, the composite structure will occupy an increasingly important position in the future bridge construction. The composite box girder is often constructed by the push-in method. Hangzhou Jiubao Bridge South Approach Bridge using a large cantilever wide box lightweight steel box girder and prestressed concrete deck composite box girder structure, box width 31.5m, cantilever over 8m, 11 across a joint, length 910m, the structural system is The widest single box composite beam. The construction adopts the original “walking ” top push construction method, novel technology: multi-point continuous push, 85m span without temporary pier, push the whole body is rigid beam, so the construction of large-span push For the first time in China. In this paper, the construction technology of the long-span long-span steel slot girder in Jiubao Bridge was studied, and the key stress point of the structure during the push-in process was analyzed: the contact boundary between the steel channel girder and the shifter was calculated and analyzed, Contact width. Practice shows that the jacking construction of Jiubao Bridge was very successful.