Shield machine is an advanced tunnel construction equipment widely used in the world. Compared with the traditional construction method, it greatly improves the efficiency and safety of construction and reduces the cost. It can be widely used in urban subway, railway, highway and hydraulic tunnel (hole) and other construction fields, and is favored by all countries in the world. The shield machine tailored by China Railway Tunnel Group for Zhengzhou Metro is 6.3 meters in diameter and 75 meters in length. It is the latest achievement of shield machine development under the National 863 Plan. It not only effectively broke the monopoly of foreign technology, but also improved in many aspects compared with ordinary shield machines, and the overall performance was further improved, making domestic shield machines surpass foreign brands.
Control system is the core technology of shield machine. This shield machine used in Zhengzhou subway has improved the centralized control mode widely used abroad into distributed I/O control, which has shortened the disassembly time of the shield machine, reduced the failure and cost, and reached the international leading level. The control system has achieved completely independent standardization, mass production and application. In addition, in order to make the shield machine more widely used, the shield machine has made a lot of improvements to the muck improvement system, such as changing the foam water pump into frequency conversion control and interlocking the foam flow rate and the propulsion speed, which further improves the degree of automation, greatly improves the construction efficiency, saves the cost and reduces the construction risk.
Shield machine manufacturing represents the level of manufacturing industry in China, and has become one of the 16 equipment industry projects supported by the state. As a construction enterprise, China Railway Tunnel Group's rich construction experience provides running water for the design and manufacture of shield machines. After eight years' efforts, the Group has completed six shield machine research projects under the National 863 Program, and obtained eight national invention patents and eight utility model patents. These new technologies with independent intellectual property rights are being applied to the manufacture of "China Railway" series shield machines. The interaction and mutual promotion between shield construction and manufacturing are the characteristics that distinguish China Railway Tunnel Group from general manufacturing enterprises. The Group has formed a complete industrial system of shield machine design, manufacture, assembly, debugging, construction and maintenance. Xinxiang shield industrialization base has reached 10 units this year, with an annual production capacity of nearly 20 shield machines. Since the restructuring of China Railway Tunnel Group in May, 20001,China Railway Tunnel Group has been aiming at the overall development goal of "leading in China and famous in the world", carrying forward the enterprise concept of "big industry, big school, big family and big stage", fully implementing Scientific Outlook on Development, advancing with the times, facing difficulties, seizing opportunities, improving capabilities, taking reform as the driving force, management as the basis and science and technology as the guide. Take innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, innovation as the driving force, and innovation as the driving force to promote scientific and modern management, so as to build a modern enterprise system that meets the requirements and adapts. The operation and production have reached a new level every year, and the competitiveness of enterprises has been significantly enhanced, realizing the sustained and rapid development of China Railway Tunnel Group in a highly competitive market environment.