抽水蓄能电站, 高压输水道放空大修, 无人机检查, 灌浆, 混凝土修复

After 20 years of operation of Tianhuangping pumped storage power station, the water conveyance system was emptied to overhaul diversion tunnel during the upgrade and renovation of ball valves for 6 units, which eliminated safety hazards. During the overhaul, the water leakage treatment method was innovated, the intelligent UAV was first used to inspect deep inclined shaft, the concentrated leakage points were treated by chemical grouting and cement grouting, and the concrete peelings were re⁃paired without formwork, providing reference for similar projects.

pumped storage power station, overhaul of empty high-pressure diversion tunnel, UAV inspection, grouting, concrete repair