关键词: 三峡枢纽, 升船机, 接缝灌浆, 剩余灌区, 外漏处理

Abstract: The head bay of ship lift of Three Gorges project is a whole structure, and all the casting blocks need to be connected by joint grouting and wide slot backfill. 7 grouting areas in elevation 48 ~ 82.5 m of block IV in the C1 and C2 seam section of the ship lift were affected by delay and pit inflow and the grouting treatment was left to trial navigation operation. Due to long time suspension, some embedded parts failed, defects such as leakage and connection of grouting areas were encountered and the
grouting area was connected with drainage network. To complete grouting construction in the premise of not affecting the foundation drainage system, water soluble polyurethane grouting material was adopted instead of cement slurry. Different slurry mix proportions and grouting speed were set according to leakage location. In the process of grouting, based on the character of water-consolidation of the slurry, water sprinkle was carried out at the leakage point which stopped the leakage of grouting slurry and guaranteed the grouting quality. The examination after completion showed that the slurry concretion was of good quality and the foundation drainage system was clear. The expected treatment effect was obtained and laid a solid foundation for trial navigation operation of the ship lift.

Key words: Three Gorges project, ship lift, joint grouting, remaining grouting area, leakage treatment