"How can something so important be sold casually? ”
In order to maintain the technological hegemony of the United States, the United States has been targeting us for decades, from large aircraft to semiconductors to drones, to new energy and artificial intelligence, and has spared no effort to suppress us.
But our country has a strong scientific and technological and economic heritage, a unique market, a group of people who have the courage to fight, plus a large number of outstanding enterprises such as the United States and SMIC, such as Huawei, SMIC, etc., they have made certain achievements in the fields of semiconductors and artificial intelligence, including many international advanced products, such as "big country heavy weapon" - shield machine!
Tunnelling is the "super probe" of metro, railway and road tunnel construction, and it is the "big probe" for the construction of subway, railway and road tunnels
When there is no tunnel boring equipment, it is generally excavated by manual excavators and excavation buckets, and its disadvantages are very significant, such as slow progress, high labor costs, and large environmental impact. In order to deal with this series of problems, the method of introduction was adopted in the early stage of China!
More than 20 years ago, the country vigorously built the Xikang Railway, the construction of the Qinling Tunnel is facing the dual problems of geology and construction, in order to ensure the safety of the construction, China chose to introduce foreign shield machines. The German tunnel boring machine was famous at that time, and its technology and reputation won our hearts.
During negotiations with Germany, their engineers swore that "China will not be able to produce such a thing in a hundred years", so the asking price was as high as 350 million, and said that they would "love to buy it or not", and they could not even enter the factory.
But under their taunts and all kinds of constraints, we didn't have the power to fight back at all, so we spent $700 million at the beginning and bought two from abroad. By 2006, China had introduced more than 130 tunnel boring machines from abroad, which is a shocking number.
In view of the current construction needs in China, the state has included a series of major scientific research topics such as tunnel boring machines"National Science and Technology Innovation Plan"and carried out cooperative research between enterprises and colleges and universities.
Two years later, the first "pioneer" in China that can work in soft soil has been successfully launched; In 2008, China's first "China Railway No. 1", which can adapt to complex environmental conditions, was successfully put into orbit. In the past two years, China's self-developed largest caliber shield machine, "Jinghua", with a length of 150 meters and a tonnage of 4,300 tons, has successfully rolled off the assembly line, bidding farewell to the blockade of Europe and the United States and other countries.
The world's largest diameter high-speed railway mud equilibrium tunnel will roll off the assembly line from Hangzhou in January 2024, with a total length of 158 m, a total length of 128 m, weighing 2600 tons, is currently the world's longest monorail tunneling distance, the longest diameter, the use of intelligent tunneling, intelligent assembly, safety warning, monitoring and other intelligent technologies, representing China's shield technology development has entered a new stage.
Now Huaxia has completely achieved the point of domestic production, becoming the world's largest shield machine exporter, occupying 65% of the market share, and their selling price has also dropped to 1 10. It is understood that at present, domestic large-diameter tunnel boring machines have been banned by Europe and the United States and other countries, and a technical embargo has been implemented. On this point, foreign ** have commented: It's time for Europe and the United States to be deflated!
From being passively beaten, to going down to the soft soil shield machine, to completing the shield machine going to the countryside under complex terrain, and then to the world's largest caliber, all of this is inseparable from the continuous breakthrough of hydraulic system, cutterhead, spindle, control system and other technologies. These are our "hole cards" and a symbol of our "Chinese power".
Therefore, we are confident that one day in the future, we can "break through"! Like it if you agree with it, and share it so that more people who have the same idea will know.