江坪河水电站超期服役的导流洞下闸封堵安全保障工程措施

江坪河水电站导流洞质量缺陷较多,且超期服役多年。为确保工程下闸封堵安全,下闸前,通过对导流洞闸门井及其上下游一定区域衬砌混凝土进行检测、结构验算、评价,并有针对性地对缺陷区域进行缺陷处理;下闸后,迅速在闸门前浇筑水下自密实混凝土进行堵漏,在闸门后浇筑混凝土挡墙提升闸墩、闸门整体稳定性。通过这些有效的安全保障工程措施,安全、高效地完成了堵头封堵施工,有效消除了下闸封堵系统性安全风险。

Safety Measures for Gate Closure of Diversion Tunnel under Extended Service of Jiangpinghe Hydropower Station

There are many quality defects in the diversion tunnel of Jiangpinghe Hydropower Station, and it has been in extended service for many years. To ensure the safety of gate closure and tunnel blocking, the lining concrete of the gate well and several upstream and downstream areas of diversion tunnel are inspected, structurally checked and evaluated before the gate is closed, and the defect area is specially treated. After the gate is closed, the underwater self-compacting concrete is immediately poured in front of the gate to stop the leakage, and then a concrete retaining wall is also poured behind the gate to improve the overall stability of gate pier and gate body. Through these effective engineering measures, the plugging construction of diversion tunnel is completed safely and efficiently, which effectively eliminates the systematic safety risks of the gate closure.