On March 13, the largest overseas-diameter shield machine independently developed by China will be used in China Communications Tianhe Assembly Plant. It will be used for the largest shield tunnel project in China - the Canapuri River Tunnel in Bangladesh. Engineering. The shield cutter has a cutter head diameter of 12.12 meters, a length of 94 meters and a weight of more than 2,200 tons. It is the largest diameter shield machine used in South Asia. This time, the medium-diameter shield and the super-diameter shield tunnel went out of the country and entered the developed countries. Monopoly oversize overseas shield market.
The Karnapuri River Crossing Tunnel Project in Bangladesh is an important part of the China-Bangali-India-Mexico Economic Corridor and is an important part of the national “One Belt and One Road” initiative. It aims to improve the Asian Highway Network and promote the interconnection of Bangladesh and its neighboring countries. The promotion of the international development of Bangladesh is of great significance. It was highly praised by the Minister of Communications of Bangladesh Obadur Kader.
The length of the Karnapuri tunnel is 3.5 kilometers. The shield section is 2,450 meters in length, the maximum depth of the tunnel is 31 meters, and the design water and soil pressure is 0.59 MPa. It is dominated by fine sand geology, and it is prone to sand formation. Liquefaction, cutters and mud cakes, cutting surface collapse, mud outlet plugging and other construction problems. Zhongjiaotianhe designed a shield machine for this purpose, adopting a suitable cutter-plate anti-cake cake design, mud system layering Backwash technology, intelligent anti-settling control technology, mud water circulation system automatic control and many other self-created technology.
Since its establishment in 2010, Zhongjiao Tianhe has always insisted on innovation-driven development. The self-developed excavation diameter 15.03 meters mud-water pressure balanced composite shield machine was successfully applied to Nanjing Weisan Road Cross-river Channel Project and is the only one with a large-diameter shield in China. Manufacturers of machine performance broke the international monopoly and led a number of technologies in the world, achieving the transformation from manufacturing to manufacturing in China. Following this Bangladesh tunnel project, Zhongjiao Tianhe is developing a 13.19-meter-diameter slurry shield. The machine will soon be applied to the first high-speed railway in Southeast Asia, the Indonesian Yawon High-speed Rail No. 1 tunnel project, which will once again set a record for China's export of overseas large-diameter shield machines and will become the largest diameter shield machine in Asian railway construction.