Recently, as the final pipe jacking section was connected to the coarse screen room of the main structure, the pipe jacking construction project for the off-site supporting pipelines of Kunming No. 15 Water Quality Purification Plant achieved full line completion. The project was invested in by China Railway Development and Investment Group Co., Ltd. and constructed by China Railway Municipal Environmental Construction Co., Ltd.

The Kunming No. 15 Water Quality Purification Plant project is a key project in the 14th Five-Year Plan for water pollution prevention and control in the Dianchi Lake basin. Located in the core protection area and buffer protection area of Dianchi Lake, it is currently the largest and most heavily invested fully underground water quality purification plant in Yunnan Province, and the third largest fully underground water quality purification plant in China. The off-site supporting pipeline project completed this time serves the No. 15 Plant project and is a key link in opening up regional sewage collection and treatment. The pipeline has a total length of more than 10.5 kilometers, with 59 pipe wells along the route. Since construction began on December 26, 2023, after more than 700 days and nights of hard work, the builders have overcome difficulties and completed all main line pipe jacking construction tasks, taking solid steps to protect the clear waters of Dianchi Lake and enhance the vitality of Kunming.

During construction, in the face of numerous challenges such as the long pipeline network, wide scope, highly dense environmentally sensitive points along the route, five crossings over Metro Line 2 and Line 5, and soft, water-rich strata that could easily cause safety hazards, the project team adhered to technical leadership and strictly controlled risks by organizing repeated expert demonstrations, optimizing construction parameters, and conducting high-frequency precise measurements. They innovatively applied a combined process of high-pressure jet grouting piles for drag reduction, Larsen steel sheet pile soil loosening, and wellhead counterweight loading, successfully overcoming technical difficulties such as open caisson inclination and pile foundation obstacles. They actively promoted the "four new technologies," including intelligent pipe jacking excavation and intelligent dust control, greatly improving construction efficiency and project quality. The project always adhered to the concept of green and safe development, installing intelligent sprinkler systems and real-time dust monitoring equipment on site to achieve green control throughout the construction process.

The full line completion of the off-site pipeline project will greatly enhance sewage collection and treatment capacity in Guandu District, Wuhua District, Xishan District, and the northern part of Chenggong District. It not only lays a solid foundation for the full operation of Kunming No. 15 Water Quality Purification Plant, but also serves as key support for promoting the ecological governance of Dianchi Lake.