Plugging construction of diversion tunnel of Pubugou Hydropower Station

The two diversion tunnels of Pubugou Hydropower Station with central distance of 45m are located at left bank.Before the construction of permanent plug,temporary plug was finished to ensure the dry ground construction.The temporary plugging concrete was placed in the ways of without layer division and thorough-pouring to ensure plugging construction completion and play the role of water retaining as soon as possible.The permanent plugging concrete was placed in the way of 2 segments and different layers,and reinforcement bar,consolidation grouting,backfilling grouting and joint system were designed in concrete placement warehouse,and the joint part between permanent plug and temporary plug was strengthened with reinforcement bar mesh.