连续刚构桥施工高强混凝土质量控制要点探讨

Discussions on High-strength Concrete Construction Quality Control Key-point of Continuous Rigid Frame Bridges

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。文章结合某一主跨145m的三跨连续刚构桥上部结构高强混凝土(C55)的浇筑施工实例,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的高强混凝土质量控制要点进行了探讨,并分析了高强混凝土浇筑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,阐述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 increasing of span,and the concrete strength used in continuous rigid frame bridge is also increasing,wherein the high-strength concrete has been widely used in the con-struction of large-span continuous rigid frame bridge.Combining the pouring construction practices of three aspects of high-strength concrete（C55）at upper structure of a three-span continuous rigid frame bridge with the main span of 145 m,this article discussed the high-strength concrete quality control key-points during the main box-girder construction of continuous rigid frame bridge from three aspects of raw material control,mixing ratio optimization and construction process control,and analyzed the ad-verse effects on bulky#0block box-girder construction of large-span continuous rigid frame bridge by higher hydration heat temperature caused during high-strength concrete pouring,and described the high-strength concrete hydration heat control measures commonly used in actual construction process,hoping to provide the reference for highstrength concrete design and construction in continuous rigid frame bridges.