Poples Daily inform Yang Hui, 36 years old. He visit schools to promote interest in company. Assistant General Manager and Executive Chief Engineer of China Communications Tianhe Machinery Manufacturing Co. Ltd. He is team leader to develop many important Chinese tunnel boring machine technologies.Also components for super big diameter tunnel boring machines. He and similar people broke monopoly of foreign companies in China.

In 2010, China Communications Construction need two TBM 15 meter diameter for Nanjing Weisan Road Crossing Channel Project (now the Yangtze River Tunnel). Foreign TBM company wanted 700 million yuan for each TBM and no delivery time guarantee. Budget of all project was 5 billion yuan.

Because this China Communications Construction decidet to develop TBM establish CCCC Tianhe in Changshu, Jiangsu. After 14 months, 6,700 drawings and 100,000 parts and components, CCCC Tianhe produced the first mud-water pressure balance composite shield machine "Tianhe". Independence came.

Until 2018, problems with China made bearings for big diameter TBM. They created problems and losses. Foreign companies closed their technology to China. TBM bearings require very very high steel precision. Designer no expertise for design new and for even to select bearings for big diameter TBM. CCCC went to universities for help. Universities had no new expertise. Together work for 2 years and success came in 2018. Finally main drive mastered. In 2019, 15.03 meters TBM "Zhenxing" produced to construct Nanjing Heyan Road under river.

In 2019  first time, China developed atmospheric pressure tool change device and the cutter head telescopic swing. In 2019, first time China developed intelligent segment assembly system. With one button operator automatic transportation, pick and assembly. "It signifies that we have mastered the design and manufacturing technology of the super large diameter shield machine." Yang Hui said.

Now Chinese atmospheric pressure tool change is better than foreign. To isolate high pressure to have standard atmospheric pressure in machine is difficult. Foreign companies design is wrong, unsuccessful. To change knife under pressure gates necessary. Changing knife in foreign systems very expensive because gates cost very much. Chinese technology is better.

http://finance.people.com.cn/BIG5/n1/2021/1126/c1004-32292699.html