China News Agency, Zhanjiang, September 13 (Liang Sheng and Zhang Pengfei) The "Yongxing" shield machine of the Zhanjiang Bay Subsea Tunnel of the Guangzhan High-speed Railway overcame new technical difficulties on the morning of the 13th and successfully crossed the main channel of Zhanjiang Bay. The channel did not cause any impact.
It is understood that the main line of the Guangzhou-Zhanjiang high-speed railway is about 401 kilometers long. The line starts from Guangzhou Railway Station, passes through cities such as Foshan, Zhaoqing, Yunfu, Yangjiang, Maoming, Zhanjiang, etc., and finally ends at Zhanjiang North Station, connecting to the Zhanjiang hub in the west. The amount is estimated at 99.8 billion yuan, and the designed driving speed is 350 kilometers per hour. It is the high-speed rail project with the longest construction mileage and the largest investment in Guangdong Province.
The Zhanjiang Bay Subsea Tunnel is a controlled project of the entire Guangzhan high-speed railway line. It has a single hole and two lines. The shield section is 7551 meters, the shield excavation diameter is 14.33 meters, and the outer diameter of the segment is 13.8 meters. It is currently the longest single-headed excavation distance in China. Cross-sea high-speed rail shield tunnel.
According to the relevant person in charge of the construction party China Railway 14th Bureau Group, the Zhanjiang Bay main channel of the Guangzhan high-speed railway is a first-class risk source in the Zhanjiang Bay submarine tunnel project. face a huge test.
At the same time, with the extension of excavation mileage, technical problems such as material transportation, tool wear and tool change, mud pipeline explosion-proof, shield tail sealing safety, long-distance ventilation and other technical problems need to be solved one by one under the conditions of ultra-long-distance subsea excavation.
The smooth passage of the Zhanjiang Bay Subsea Tunnel through the main waterway means that Zhanjiang has taken another substantial step forward in connecting to China's "eight vertical and eight horizontal" high-speed railway network.
After the Guangzhou-Zhanjiang high-speed railway is opened to traffic, it will realize a 90-minute connection between the central urban area of Guangzhou and the central urban area of Zhanjiang, and integrate the high-speed into the joint development of the Guangdong-Hong Kong-Macao Greater Bay Area, enhance the regional economic status of western Guangdong, and promote the overall economic and social development of Zhanjiang.
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