摘要
传统碾压混凝土大坝在陡峭地形及高温环境下,存在混凝土入仓效率低(<50 m 3/h)、骨料分离(离散系数>0.25)及温度裂缝多等问题。为解决复杂地形条件下混凝土入仓效率低、骨料离析及温度裂缝多等问题,以赞比亚下凯富峡水电站碾压混凝土大坝为工程载体,针对右岸45°陡坡地形约束,研发包含动态回转布料装置(回转半径30 m)、多级缓冲导料系统(降速比1∶2.5)和智能喷雾温控模块(温差控制≤3℃)的全皮带连续输送系统。结果表明:该系统实现混凝土输送强度达280 m 3/h,入仓温度波动幅度较传统方式降低65%,施工周期缩短22%。研究成果可为200 m级高碾压坝施工提供了可量化的创新解决方案。
Traditional roller-compacted concrete(RCC)dams in steep terrain and high-temperature environments face problems such as low concrete placing efficiency(<50 m 3/h),aggregate segregation(coefficient of variation>0.25)and frequent temperature cracks.To address these issues under complex topographic conditions,a full belt continuous conveying system was developed based on the RCC dam project of the Lower Kafue Gorge Hydropower Station in Zambia,which was constrained by the 45°steep slope on the right bank.The system is composed of a dynamic rotary distributing device(with a swing radius of 30 m),a multi-stage buffer guiding system(with a speed reduction ratio of 1∶2.5)and an intelligent spray temperature control module(with temperature difference controlled≤3℃).The results show that this system achieves a concrete conveying intensity of 280 m 3/h,reduces the fluctuation range of concrete placing temperature by 65%compared with traditional methods,and shortens the construction period by 22%.The research findings provide a quantifiable innovative solution for the construction of 200-meter-level high roller-compacted dams.
作者
高元博
GAO Yuanbo(Sinohydro Bureau 11 Co.,Ltd.,Zhengzhou 450001,China)
出处
《西北水电》
2025年第6期126-129,138,共5页
Northwest Hydropower
关键词
碾压混凝土
全皮带连续输送系统
快速入仓
Roller-Compacted Concrete
Full Belt Continuous Conveying System
Rapid Concrete Placing
