Abstract: Blocking construction on right bank diversion-tunnel in Ynzidu hydropower station is during flood period.To ensure the project impounding and generating electricity in time,we design to adopt expanding concrete mixing MgO,calling off joint grouting,fully preparing prior construction and selecting appropriate techniques.Those measures ensured diversion blocking successfully completed during flood period.?

摘要： 引子渡水电站右岸导流洞堵头封堵施工已处于汛期内，施工工期异常紧迫，为确保整个电站能按时蓄水发电，设计采用掺有MgO的膨胀混凝土，取消了接缝灌浆．同时施工准备充分，施工工艺合理，使导流洞堵头能在汛期内施工顺利完成。