May 21st — On the 24th, under the guidance of the Network Evaluation Bureau of the Central Network Information Office and the Propaganda Bureau of the State Council State-owned Assets Supervision and Administration Commission, the fourth stop of "Science Fiction Writers Entering New State-owned Enterprises" jointly sponsored by the State Council State-owned Assets Supervision and Administration Commission Press Center, World Wide Web, Shell, Future Affairs Administration and Sina Weibo — — The theme activity of "Tunneling Underground City" entered China Railway Equipment and China Railway Construction Heavy Industry, and experienced the strength and beauty of the shield machine of "Great Power and Heavy Equipment" and witnessed the growth history of "Infrastructure Mania" from scratch to excellent.
Underground space is always mysterious and unknown. To expand more human living space, it is necessary to "dig underground cities". In 1960s, in order to dig underground cities, the older generation of builders in China dug the first subway in New China by manpower. Over the past 40 years, China urban rail has already established a complete modern technology system, covering more than 40 cities in the motherland, with a total mileage of over 5,500 kilometers, and its operation scale ranks first in the world.
The subway has greatly expanded the way people travel, and the criss-crossing underground network has built an "underground palace". While enjoying the convenience, do you know who the "pioneers" who dig tunnels are? We can be so hard-driving in the matter of tunneling, relying on the domestic shield machine that has been continuously innovated from generation to generation.
The whole shield machine is made of steel, and some people call it "steel pangolin". These super shield machines, which can cross rivers, lakes and seas and cut through mountains and mountains, have made great contributions to the high-speed rail and subway.
In 1990s, shield machine has experienced nearly a hundred years of development — — However, there is no such equipment in China. At the same time, because of the need to build railway tunnels, the demand for shield machines has also increased sharply. German, Japanese and American equipment began to flood into China on a large scale. However, the dependence on foreign equipment also brings many problems, such as "technical experts have to be matched by others, and the maintenance also draws a warning line". So Chinese builders started from scratch, and started to design, develop and manufacture domestic shield machines independently from design drawings.
Until 2015, the first domestic large-diameter railway shield machine was successfully rolled off the assembly line in Changsha, with completely independent intellectual property rights, breaking the technology monopoly of foreign countries for nearly a century. According to public data, this big guy has a total length of 100 meters, weighs about 1,200 tons, installed power exceeds 4,500 kilowatts, and the excavation diameter reaches 8.8 meters.
The shield machine is too big to fit in one well. It sometimes takes hours just to make the cutter head of shield machine stand up. More importantly, its price per unit is more than 20 million yuan cheaper than that of imported similar products, with high cost performance and good reliability, which can be applied to various complex strata.
According to Sun Xuefeng, an expert on shield machines in China, concentric circles excavated by domestic shield machines in hard rock tunnels are the most beautiful pictures in the world, "more beautiful than any flowers".
After more than ten years of exploration and development, China shield machine has become more and more efficient and humanized, and has gradually come to the forefront of the world. Nowadays, domestic shield machines have been widely used in many projects, such as high-speed railway tunnels, water diversion tunnels and even some national defense projects. In the future, shield machines will also dig into unknown strata.
"It is difficult for foreign equipment to enter the China market as easily as before," Sun Xuefeng said.
There has never been the same starting line, and it has never been easy, taken for granted, and achieved overnight. Huge waves show the true colors of heroes, and Noah’s Ark was forged through hardships, thus gaining scientific and technological independence. At present, China’s shield machine accounts for two-thirds of the global market share, and by the way, it lowers the price of similar foreign products by 40%. The world’s first horseshoe shield, the world’s largest rectangular shield, the world’s first inclined shaft dual-mode TBM, and the world’s first permanent magnet motor-driven shield machine & HELIP; … These world-leading technologies are all from China.
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