红旗渠上红旗飘——长沙地下“天河”攻坚战纪实

Core Viewpoint - The article highlights the successful construction of an underground drainage system in Changsha, referred to as the "Underground Hongqi Canal," which parallels the historical Hongqi Canal in Henan, showcasing innovation and determination in urban infrastructure development [3][10]. Group 1: Project Background - The original Hongqi Canal in Henan was built over ten years by nearly 100,000 people, creating a significant waterway known as the "eighth wonder of the world" [3][10]. - The Changsha project, initiated in the 1970s, spans 10 kilometers and serves an area of 11.66 square kilometers, addressing long-standing drainage issues in the old city [4][12]. Group 2: Construction Challenges - The project faced significant challenges, including outdated infrastructure, complex underground networks, and the need to navigate around existing utilities such as seven subway lines and multiple high-voltage cables [15][8]. - The construction team employed innovative techniques, including a curve pipe jacking method, to avoid disrupting the urban environment, which was deemed essential for maintaining public order [15][20]. Group 3: Technological Innovations - Various construction methods were tested, including high-performance concrete spraying and prefabricated assembly, with the spraying method ultimately chosen for its efficiency and cost-effectiveness [13][5]. - The project utilized advanced technology, including BIM modeling, to ensure precise construction and mitigate risks associated with underground work [24][29]. Group 4: Project Outcomes - The project successfully completed 10.4 kilometers of main channel and 6.4 kilometers of non-excavation repairs, along with the installation of 80 working wells and the application of over 30 new technologies [29][30]. - The initiative has significantly improved urban drainage, preventing flooding and restoring the ecological health of the Liuyang River, with a total investment of 8.798 billion yuan in related infrastructure projects [30][12].