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China's longest undersea subway tunnel marks completion

Updated: Jan 21,2020 01:36 PM    Xinhua
Photo taken on Jan 19 shows the construction site of China's longest undersea subway tunnel in Qingdao, East China's Shandong province. The construction project of the Dayang-Qingdaobei section of Qingdao Metro Line 8 marked the completion of the 5.4 km undersea subway tunnel of the Qingdao Metro Line 8. The undersea subway tunnel is the longest one of its kind in China so far. [Photo/Xinhua]

QINGDAO — Construction of the longest undersea subway tunnel in China was completed on Jan 20 in Qingdao, a coastal city in Shandong province.

The 5.4-km-long tunnel, between the stations of Dayang and Qingdao North, is part of the Subway Line No 8 project in Qingdao.

The eastern side of the tunnel was dug by the slurry shield method, while the western side by the mining method, said Wang Zili, chief engineer of the project with the China Railway Group, the company responsible for the construction.

Multiple measures, including the utilization of a robotic arm, were adopted to avoid water and mud bursts, Wang said.

The tunnel has surpassed the cross-sea tunnel of the Qingdao's Subway Line No 1, which has 3.49 km of the line undersea, becoming the longest undersea subway tunnel in China, according to the China Railway Group and the Qingdao Metro Group, operator of the subway lines.

The Subway Line No 8, which will run 61.4 km with 18 stations designed, will connect the international airport of Jiaodong and railway stations of Jiaozhou North, Hongdao and Qingdao North, linking the city proper of Qingdao, the economic zone of Hongdao and the city of Jiaozhou.

A cameraman takes photos of the construction site of China's longest undersea subway tunnel in Qingdao, East China's Shandong province, on Jan 19. [Photo/Xinhua]
A worker sets up a warning line at the construction site of China's longest undersea subway tunnel in Qingdao, East China's Shandong province, on Jan 19. [Photo/Xinhua]

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