连续刚构桥高强混凝土施工质量控制要点及应用

Construction Quality Control Points and Application of High-Strength Concrete of Continuous Rigid Frame Bridge

随着跨径的不断增大,连续刚构桥所采用的混凝土强度也越来越高。其中,高强混凝土已被普遍用于大跨连续刚构桥的修建中。结合高速公路上某一主跨145m的三跨连续刚构桥上部结构高强混凝土(C55)的浇筑施工,从原材料控制、配合比优化、施工工艺控制等三个方面对连续刚构桥主箱梁施工过程中高强混凝土质量控制要点进行了分析。另外,对于高强混凝土浇注过程中所产生的水化热温度过高对大跨连续刚构桥大体积零号块箱梁施工带来的不利影响,归纳了实际施工过程中常用的高强混凝土水化热控制措施,以期为连续刚构桥中高强混凝土的设计及施工提供参考。

With the continuous increase of span length,the strength of concrete adopted by continuous rigid frame bridge is higher and higher,in which,high- strength concrete has been widely applied in the construction of large- span continuous rigid frame bridge. In combination with the pouring construction of high- strength concrete（ C55） on the upper structure of three- span continuous rigid frame bridge with a main span of 145 m of expressway,the analysis on quality control points of high- strength concrete during the construction of main box beam of continuous rigid frame bridge is made from three aspects like raw material control,mix proportion optimization and construction technology control. In addition,negative influence of excess temperature of hydration heat produced during the pouring procedure of high- strength concrete on the construction of box beam of large volume part 0 of large- span continuous rigid frame bridge is brought,and control measures for hydration heat of commonly- used high- strength concrete during the practical construction are summarized,so as to provide reference for the design and construction of high- strength concrete in continuous rigid frame bridge.