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本文通过对小箱梁墩顶负弯矩区构造进行调研和分析,针对小箱梁负弯矩区在施工和使用中出现的问题,提出负弯矩钢束下弯锚固于小箱梁翼缘板底的优化改进措施,并进行理论分析及依托工程对比试验,改进后的负弯矩钢束构造可以避免以往施工及使用中小箱梁墩顶负弯矩钢束灌浆不密实、张拉伸长量不足、摩阻损失大、施工槽口混凝土质量难以保证等一系列问题。
In this paper, by investigating and analyzing the structure of the negative moment zone of the small box girder, in view of the problems in the construction and use of the negative bending moment zone of the small box girder, Optimization and improvement measures, and theoretical analysis and relying on comparative engineering test, the improved negative bending moment steel beam structure can avoid past construction and use of small box girder negative bending moment steel beam grouting is not dense, lack of tensile elongation , Friction loss, construction of concrete quality is difficult to guarantee a series of problems.