广州首条超大直径盾构隧道建成通车

Core Points - The Guangzhou Haizhu Bay Tunnel, designed by China Railway Fourth Survey and Design Institute and constructed by China Railway 14th Bureau, officially opened on November 12, significantly reducing travel time from downtown Guangzhou to Guangzhou South Station to approximately 15 minutes [1] - The tunnel spans 4.35 kilometers, with a shield section measuring 2,102 meters and a maximum excavation diameter of 15.07 meters, making it the first ultra-large diameter shield tunnel in Guangzhou's urban construction history [1] - The tunnel is built to accommodate a six-lane urban expressway standard and is expected to enhance the transportation capacity of Guangzhou South Station, reinforcing its role as a core transportation hub in the Guangdong-Hong Kong-Macao Greater Bay Area [1] Design and Construction - The design team focused on key technologies such as full-section rock layer ultra-large diameter shield tunnel design and integrated waterproofing design for the tunnel structure, successfully addressing the challenges posed by the complex geological conditions of the Pearl River Delta [1] - The construction team utilized two 15-meter ultra-large diameter shield machines, named "Pioneer of the Great Road" and "Pioneer of Opening Roads," to tackle construction challenges including steep gradients and small curves, achieving millimeter-level settlement control under densely built urban areas [1]