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文章通过浙江省青田县北山特大桥主墩承台基础大体积混凝土浇注过程采取的裂缝控制措施的研究,分析了大体积混凝土裂缝产生的机理,提出了控制裂缝一些新方法。实践证明,本工程由于方案合理,技术先进、组织科学、管理到位,大体积混凝土裂缝控制效果非常满意,水化热未对混凝土构件质量产生不良影响。从混凝土外观看,未发现承台混凝土产生任何内外约束裂缝,可见对大体积混凝土裂缝控制措施是相当成功的。本工程对大体积混凝土裂缝控制措施,为今后类似工程施工提供了宝贵经验和科学数据。
In this paper, through the research of crack control measures adopted in the mass concrete pouring process of the cap pier foundation of Beishan Bridge in Qingtian County, Zhejiang Province, the mechanism of cracks in mass concrete is analyzed and some new methods to control cracks are proposed. Practice has proved that due to the reasonable scheme, advanced technology, scientific organization and management, the control effect of mass concrete cracks is very satisfactory. The heat of hydration has no adverse effect on the quality of concrete components. From the exterior of the concrete, no any internal and external constraint cracks were found in the capped concrete. It can be seen that the control measures for the large-volume concrete cracks are quite successful. The control measures of mass concrete cracks in this project provide valuable experience and scientific data for similar projects in the future.