On May 20, 2009, the Nanjing Yangtze River Tunnel, which represents one of the highest standards of underwater tunnel construction in China, was connected to the left.
The tunnel construction lasted for 3 years and 8 months. It is a two-way six-lane road with a total length of 6042 meters and a total investment of 3.3 billion yuan. It has attracted many attentions from the underground engineering circles at home and abroad due to many world-class challenges.

Called Banyang experts, "China's creation" is convincing
Since the construction of the Nanjing Yangtze River Tunnel, the spirit of “Dare to challenge foreign goods and dare to surpass foreign experts” has followed.
On August 6 last year, after the tunnel right-hand shield machine advanced 1,316 meters at the bottom of the river, it had to be shut down due to severe wear and tear on the tools. In the engineering shield machine industry, Germany and Japan have always been in the dominance of the industry, and German technical experts firmly believe that their tools are no problem. The builder immediately found a domestic manufacturer and redesigned the curvature, thickness and size of the tool alloy material. After improvement, the shield machine can excavate 400 meters without changing the tool, and the durability rate is increased by 8 times.
Since the beginning of the Nanjing Yangtze River Tunnel, it has circumvented all the technical risks that can be predicted and guaranteed the world-class quality of world-class tunnels.

China's tool industry status
In the 1980s, with the bankruptcy of the German Rohde Doerrenberg company, which was known for inventing the twisting process, the production of high-speed steel tools gradually shifted to China. According to statistics, since 2004, China has exported 1.939 billion high-speed steel tools, equivalent to 25 times the annual output of high-speed steel tools in Japan.
After 2007, China produced a total of 3.65 billion high-speed steel cutters (including 2.55 billion pieces of exports), with a sales income of 10.9 billion yuan. In the same year, Japan produced 97 million high-speed steel cutters with a sales income of 881.3 million US dollars. Foreign high-speed steel tool manufacturers and even high-speed steel mills, some adjust production types, some transfer manufacturing bases, and some have sold the entire company to Chinese companies.
According to estimates, global high-speed steel production after 2008 is about 251,000 tons, while Chinese manufacturers produce about 35.5% of the total output; and China's tool output in 2006 is close to 20 billion yuan. Contracts of $2.6 billion), about 20% compared to $13 billion worldwide.
At present, many tool factories in China are trying to develop their own technologies, and at the same time, they have introduced a large number of foreign advanced tool manufacturing equipment and imported raw materials, and have begun to move beyond the world level and strive to replace imported roads.

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