CCTV reporter Wu Hao, Gao Yuan, Henan station, Hunan station
Known as the "king of construction machinery", the shield machine is not only a weapon for excavating tunnels, but also an important symbol to measure the level of a country's manufacturing industry.
From the initial blank in the field of domestic shield machines, to now seven out of every ten shield machines in the world are from China, how Chinese brands can sell well at home and abroad, let's find out↓
In the assembly workshop of China Railway Equipment in Zhengzhou, Henan Province, the shield machine with a diameter of nearly 14 meters is undergoing the final inspection and will be sent to Europe, which is also the largest diameter shield machine exported from China to Italy, integrating a number of innovative technologies such as continuous tunneling and cast-in-situ bottom arch.
Yin Yuefeng, Engineer of the Technology Center of China Railway Equipment Group: In view of the characteristics of the formation rich in gas, we adopted the concept of partitioning to carry out a targeted explosion-proof design for the whole machine, which solved the technical problem that it is difficult for conventional shield machines to excavate in the formation rich in harmful gases, and the efficiency of tunnel construction has been increased by 20% to 30%.
The shield machine that continues to advance is a microcosm of China's manufacturing industry to the middle and high-end. Not long ago, the world's longest undersea high-speed rail tunnel, the Jintang Undersea Tunnel of the Yongzhou Railway, was installed and debugged and is about to start excavation. With a total length of more than 16 kilometers and a maximum depth of 78 meters, the tunnel is extremely complex in the world, with two shield machines tunneling from both ends to the middle, and finally docking on the seabed with an error of no more than 20 mm. For this purpose, the construction party has developed more than 10 new technologies, equipped with the guidance system with the highest control accuracy in the world, and added special equipment such as advanced geological prediction and advanced grouting reinforcement.
Hu Hao, commander of the Yongzhou Railway Project of the 14th Bureau of China Railway: Our national tunnel project is large, widely distributed, crosses mountains and seas, complex and changeable geology, and constantly innovates in the process, accumulating rich experience, which makes our shield machine have a very strong advantage in international competition, can solve all kinds of problems, customize all kinds of special functions, so China's shield equipment construction can be trusted and welcomed all over the world.
Can turn, climb, extreme cold, China's shield machine varieties are more and more, the function is more and more powerful, the industrial chain is more and more complete, from basic materials, components to key components, and constantly achieve breakthroughs, the upstream and downstream enterprises of the continental shield machine have thousands. From scratch, from excellent to strong, "China Shield" is becoming a well-known "Chinese brand" in the world.