The Central Yunnan Water Diversion Project has sounded the call for continued striving, with builders going full throttle to set off a wave of tackling key challenges, and good news of progress pouring in from multiple project sites.

　　The Central Yunnan Water Diversion Project Department of the Fifth Company of China Railway No. 5 Engineering Group has fully set off a vigorous construction upsurge. The project department has sorted out in detail the difficulties faced at each work site, reversed the construction schedule, carried out operations with wall charts, formulated, optimized and refined construction organization plans, strengthened the allocation of production factors such as manpower, machinery and materials to key routes, comprehensively replaced old and frequently malfunctioning mechanical equipment, and injected full power into production and excavation. All participating staff, in the spirit of "the start is a sprint, the opening is a decisive battle," have mustered their energy to advance the monthly construction progress of each excavation face, lining work face, inverted siphon and grouting work face.

　　The controlled main tunnel section from the downstream of Branch Tunnel No. 10 to the upstream of Branch Tunnel No. 11 of the **Changtun-Kuncheng Tunnel** of the Central Yunnan Water Diversion Project, constructed by China Railway No. 5 Engineering Group, was recently successfully holed through, 584 days ahead of the scheduled construction period. Section 6 of the Kunming section of the Central Yunnan Water Diversion Project is located within the Kunming Economic and Technological Development Zone and Chenggong District of Kunming City, where the construction environment is sensitive. The project department organized labor competition activities such as "100 Days of Vigorous Construction" and "Sprint in the Fourth Quarter, 70 Days of Vigorous Construction," continuously setting off construction upsurges. In response to issues such as reduced efficiency due to railway involvement, the impact of speed-limited construction, and common quality problems prone to occur in tunnels, special construction plans were prepared and a technical research team was established, while the all-staff safety production responsibility system was strictly implemented, ensuring the smooth realization of project milestone goals and the "zero accident" goal for safety and quality.

　　The Songhuaba Reservoir water lifting pipeline of the Panlong main line of Section 2 of the Kunming construction of the Phase II Supporting Project of the Central Yunnan Water Diversion Project, constructed by China Railway No. 7 Engineering Group, was recently successfully completed, achieving the water supply goal on schedule and becoming the first main line and branch line to supply water in the Phase II Supporting Project of the Central Yunnan Water Diversion Project. The starting point of the Songhuaba Reservoir water lifting pipeline connects to the water lifting pipeline of the high-level water tank of the No. 7 Water Plant of the already-built emergency project, and the endpoint is located at Songhuaba Reservoir, with a total line length of 684 meters. The project department held a special meeting on construction advancement to reverse the schedule of tasks; under the premise of ensuring safety and quality, it fully allocated various resource factors, optimized construction organization arrangements, worked overtime 24 hours a day, and continuously accelerated the construction speed of the water lifting pipeline, completing it one month ahead of the original plan.

　　Recently, the pipeline laying of the Guanyinshan inverted siphon project of the Central Yunnan Water Diversion Project, constructed by China Railway No. 7 Engineering Group, has completed 9.62 kilometers, accounting for 98% of the total length. The Guanyinshan inverted siphon is located in Bicheng Town and Renxing Town of Lufeng City, with a total length of 9.78 kilometers. It connects to the Longtan Tunnel upstream and the Caijiacun Tunnel downstream, and uses three parallel pressure steel pipes with an inner diameter of 4.2 meters for water conveyance, with a design flow of 100 cubic meters per second and a maximum net water head of 165.8 meters. It is currently the single inverted siphon water diversion project under construction in China with the longest line and the largest construction scale.