Core Points - The successful launch of the first shield machine "Xianxing" marks the commencement of the tunneling phase for the Chengxi South Drainage Project, a significant water conservancy initiative in Hangzhou [1] - The shield machine is approximately 90 meters long, weighs about 2500 tons, and has a diameter of 12.1 meters, designed to excavate a 5-kilometer underground tunnel [1] - The project aims to enhance flood control standards in the Chengxi area from a 20-year to a 50-year flood occurrence rate [2] Group 1 - The Chengxi South Drainage Project is crucial for addressing flood drainage deficiencies in the Chengxi region and ensuring water safety for the Hangzhou Chengxi Science and Technology Corridor [2] - The project is currently advancing across various construction segments, including vertical shaft excavation and tunnel lining works [2] - The city water service group has implemented advanced calibration and management systems to ensure the precision and efficiency of the shield machine's operation [1]

Group 1 - The project marks the commencement of the underground tunnel excavation phase for the Hangjia Lake South Drainage West Channel Expansion Project, with the first shield machine "Xianxing" successfully starting its operation [1] - The shield machine is approximately 90 meters long, weighs about 2500 tons, and has a diameter of 12.1 meters, designed to excavate a 5-kilometer underground tunnel [1] - The assembly of the shield machine involved over 12,000 components and was completed in 88 days, showcasing the efficiency of the municipal water group [1] Group 2 - The project aims to enhance flood control and drainage standards in the western region of Hangzhou from a 20-year to a 50-year occurrence level [2] - The construction includes multiple water inlets and a Y-shaped underground drainage channel, which is 29 kilometers long and buried 55 meters underground [2] - The drainage capacity is designed at 250 cubic meters per second, with a backup capacity of 300 cubic meters per second [2]