船闸工程大体积混凝土裂缝控制施工技术  

Construction technology of crack control for large volume concrete in ship lock engineering

作　　者：符业晃 代应刚 李泳龙 FU Yehuang;DAI Yinggang;LI Yonglong(China Communications Fourth Navigation Engineering Bureau Co.,Ltd.,Guangzhou 610213,China;Sichuan Port and Channel Construction Engineering Co.,Ltd.,Chengdu 610023,China;Sichuan Communication Surveying&Design Institute Co.,Ltd.,Chengdu 610017,China)

机构地区：[1]中交第四航务工程局有限公司,广东广州510290 [2]四川港航建设工程有限公司,四川成都610023 [3]四川省交通勘察设计研究院有限公司,四川成都610017

出　　处：《水运工程》2023年第10期99-103,114,共6页Port & Waterway Engineering

摘　　要：针对船闸大体积混凝土建筑物浇筑容易出现温度裂缝的难题,通过优化施工配合比设计、埋设冷却水管、控制浇筑的层间厚度及间歇时间、表层保湿养护等多重裂缝控制施工技术措施,实现了龙溪口船闸大体积混凝土的裂缝控制,同时利用传感器采集混凝土温度数据,对控裂措施进行效果评价。现场实际应用中,浇筑后混凝土温峰在32.1~41.4℃之间,内表温差在9.6~16.4℃之间,均远低于温控指标的要求,未产生可见温度裂缝。浇筑时同步成型的混凝土干缩C20试块28 d最大干缩率为同养228×10^(-6),标养182×10^(-6),表明混凝土温降阶段大体积混凝土的抗裂性能得到大幅提高。In response to the difficult problem of temperature cracks in the pouring of large volume concrete buildings in ship locks,this paper achieved crack control of the large volume concrete at Longxikou ship lock by optimizing the construction mix design,burying cooling water pipes,controlling the interlayer thickness and intermittent time of pouring,and maintaining the surface moisture.Meanwhile,sensors are used to collect concrete temperature data to evaluate the effectiveness of the crack control measures.In practical field applications,the temperature peak of concrete after pouring is between 32.1~41.4℃,and the internal surface temperature difference is between 9.6~16.4℃,both of which are far below the requirements of temperature control indicators without visible temperature cracks.The maximum 28-day dry shrinkage of C20 test blocks formed synchronously during pouring is 228×10-6 in the same curing period and 182×10-6 in standard curing room.This indicates that the crack resistance of large volume concrete has been greatly improved during the temperature drop stage of concrete.

关 键 词：大体积混凝土 温控 控裂 配合比优化 自动化 

分 类 号：U641.2[交通运输工程—船舶及航道工程]