Due to long-term rainfall, the load of the reservoir increases and the water storage capacity increases too fast, resulting in gate damage, impact deformation, unable to rise and fall normally, and the hydropower station cannot throttle and discharge flood normally. Large tonnage chain block is urgently needed in hydropower station for gate emergency repair.

After the workers successfully transported the chain block to the site, the hydropower station immediately organized the workers to carry out the gate rescue work. Until the gate repair work was completed at 5 p.m., the gate of the hydropower station could rise and fall normally and discharge flood, and the danger was successfully relieved.