摘要
制定科学的施工现场温控方案是防止大体积混凝土在冬季施工时产生外层冻害和温度裂缝的关键。为了制定针对性的温控方案,本文以寒区桥梁承台大体积混凝土施工为背景,模拟冬季施工外部环境进行混凝土结构温度场、应力场分析,并结合分析结果提出温控标准和施工建议,进而根据现场温度场监测结果及时有效调整温控措施。结果表明,采取蓄热能法适当提高混凝土浇筑温度、浇筑前对基础和冷壁进行预热、浇筑过程中加强中心区域混凝土通水降温、浇筑完毕后对表层混凝土进行严格的保温养护等措施,可以有效控制承台混凝土温度裂缝的产生,兼顾防冻与抗裂两方面的要求。
Formulating a scientific construction site temperature control scheme is the key to prevent frost damage and temperature cracks of mass concrete during winter construction. In order to develop targeted temperature control schemes,taking the mass concrete construction of pile cap in cold regions as the background,the temperature field and stress field of concrete structure were analyzed by simulating the external environment during winter construction,and the temperature control standards and construction suggestions were put forward based on the analysis results,and then the temperature control measures were adjusted timely and effectively according to the monitoring results of the site temperature field. The results show that adopting the thermos method to raise the concrete construction temperature properly,preheating the foundation and cold wall before casting,strengthening the cooling of concrete in the central area during casting,and adopting strict heat preservation and curing measures for surface concrete after casting can effectively control the temperature cracks in the concrete pile cap and take into account the requirements of anti-freezing and cracking resistance.
作者
金书成
徐文远
黄云涌
JIN Shucheng;XU Wenyuan;HUANG Yunyong(School of Civil Engineering,Northeast Forestry University,Harbin Heilongjiang 150040,China;Heilongjiang Bridge Development and Construction Ltd.,Harbin Heilongjiang 150040,China)
出处
《铁道建筑》
北大核心
2019年第11期55-58,共4页
Railway Engineering
基金
黑龙江省交通运输厅重点科技项目（2017HLJ0029）
关键词
桥梁承台
大体积混凝土施工
温控方案
温度场监测
防冻与抗裂
pile cap
mass concrete construction
temperature control scheme
temperature field monitoring
antifreezing and cracking resistance
