Guangdong: the world's largest underwater railway shield tunnel through
On December 17, it was learned from Guangdong railway construction investment group that Shiziyang Tunnel of Foshan Guanzhou inter city railway, the world's largest underwater railway shield tunnel, has been successfully completed, which marks the great progress of inter city railway construction in the Pearl River Delta and adds new impetus to the construction of Guangdong Hong Kong Macao Bay area.
Foshan Guanzhou intercity railway is 36.68km long, with a design speed of 200km / h. Shiziyang Tunnel is the key control project of the whole project. The total length of the tunnel is 6476 meters, including 4900 meters of shield tunnel. China Railway Tunnel Bureau, which undertakes the construction, adopts a super large diameter slurry balance shield machine with a total length of 137 meters and a diameter of 13.61 meters, which has the function of atmospheric pressure tool change. It starts from Panyu District, Guangzhou City, passes through the Pearl River Shiziyang, and then runs through the tunnel in Machong, Dongguan. After three years of hard work, the construction team has successfully crossed many sections of uneven soft and hard, three sections of broken belt, three sections of high-strength full section hard rock, made major breakthroughs in large-diameter shield construction technology, applied for dozens of technical innovation patents, two provincial and ministerial construction methods, won seven provincial and National QC Project Awards, and created a good performance of the highest monthly excavation of 304 meters, and constructed in composite stratum The progress can reach 180 meters / month, and the average progress index is about 126 meters / month. After the
project is opened to traffic, it can be reached as soon as 15 minutes from Dongguan to Panyu, Guangzhou. This will play a significant role in the construction and improvement of the "ten" backbone network of the Pearl River Delta Intercity Rail and the realization of the "one hour" urban circle in the Pearl River Delta, and will greatly promote the interconnection between the important cities in the Pearl River Delta.