某连续刚构桥底板崩裂及低温合龙技术探讨

Discussion on a continuous rigid frame bridge floor crack and cryogenic closure technology

针对青海高寒地区某公路大桥中跨合龙过程中底板崩裂及低温合龙措施进行了分析。根据底板崩裂破坏机理确定了凿除松散层、加密防崩钢筋、采用高一级标号混凝土现场浇筑的处理方案,通过不同合龙温度的比较分析,确定了低温合龙的最佳温度为5℃。因此,在类似桥梁设计施工中,在预应力筋管道处应预埋测温线。

This paper analyzed the measures of bridge floor crack and cryogenic Closure Technology in the process of Qinghai alpine region highway bridge, According to the failure mechanism of bridge floor crack determined the scheme, Chiseled loose concrete, encryption anti - collapse of reinforced, pouring high - grade concrete on - site program. Comparative analysis of different closure tempera- tures, Determine the final closure temperature of 5 ℃, Therefore, in the design and construction of similar bridges,temperature line shall be embedded in the pipeline of prestressing tendons.