On October 26th, the Tongjing Road Tunnel in Suzhou City, Jiangsu Province began shield tunneling. The excavation diameter of the shield machine was 13.67 meters, making it China's first large-diameter shield tunnel underneath an operating high-speed railway.
The north extension project of Tongjing Road has a total length of 2066.703 meters. It passes through Shanghai-Nanjing Expressway, Shanghai-Nanjing Intercity Railway, Shanghai-Nanjing Railway and Beihuan Expressway in the form of a shield tunnel. The tunnel is designed as a two-hole six-lane, one-way long 490 meters.
Among them, the Shanghai-Nanjing intercity high-speed rail that the shield tunnel passes under twice has a design speed of 350 kilometers per hour. It is one of the busiest high-speed rail lines in China. The minimum travel interval is 3 minutes. The settlement of the high-speed rail line during the construction period must be controlled within 1 mm. precedent.
It is reported that the shield machine is equivalent to a super intelligent robot. Tunnel excavation and lining are formed at one time, with high automation, high construction efficiency, high settlement control standards, safety, energy saving and environmental protection.
(Reporting by reporter Yang Bo and Zhang Chuanming in Suzhou, Jiangsu)
Editor in charge: 【Luo Pan】