Guangdong: world's largest underwater railway shield tunnel opens

On December 17, the world's largest underwater shield tunnel was successfully completed, marking significant progress in the construction of inter-city railway in the pearl river delta and adding new impetus to the construction of the guangdong-hong kong-macao greater bay area.

The total length of the inter-city railway is 36.68 kilometers, with a designed speed of 200 kilometers per hour. The lion - Yang tunnel is the key control project. The tunnel is 6476 meters long, of which the shield tunnel is 4900 meters long. The construction of China railway tunnel bureau is carried out by a single head tunneling machine with a total length of 137 meters and a diameter of 13.61 meters, which has the function of changing knives at atmospheric pressure. It starts from panyu district of guangzhou, passes through the pearl river, and then goes through the hole in marong district of dongguan. Construction team after three years of hard work, success across multiple fracture zone, the imbalance of the hard and soft, 3 paragraphs 3 period of full face hard rock, high strength in large diameter shield tunnel construction technology has achieved a major breakthrough in the, declare the dozens of patents of technology innovation, two provincial method, seven provincial and national QC project award, created the 304 meters of the highest month, in a composite formation construction progress can reach 180 m/month, the average progress index of about 126 meters per month.

After the project is opened to traffic, it can be reached from dongguan to panyu in guangzhou in 15 minutes at the earliest. This will play a significant role in the construction and improvement of the "ten-character backbone network" of the pearl river delta intercity track and the realization of the "one-hour" urban circle in the pearl river delta region, which will greatly promote the connectivity among major cities in the pearl river delta region.