History of the Development of the Chinese Shield Machine
The shield machines have a history of nearly 200 years. It started in the United Kingdom and developed in Japan and Germany. For more than 40 years, through the key technologies in the earth pressure balance type and mud-water type shield machine, such as the effective sealing of the shield machines, the stability of the excavation surface is ensured, and the surface uplifts and collapse are controlled within the specified range, and the cutting tool The service life and tool replacement under sealed conditions, and the exploration and research on the treatment technology of some harsh geology such as high water pressure conditions, have made the shield machine develop rapidly. Shield machines, especially earth pressure balance and mud-water shield machines, have developed rapidly in Japan due to the rapid economic development and the need for practical engineering. Germany’s shield machine technology is also unique, especially in the underground construction process, with the premise of ensuring sealing and the replacement of the cutter on the cutter head under the condition of up to 0.3MPa air pressure, so as to increase the one-time excavation length of the shield machine. Germany has also developed a method to replace worn tools from the normal pressure space inside the large-diameter cutter head under sealed conditions.
The principle of shield machine selection is to adopt measures to local conditions, maximize the degree of mechanization, and reduce the impact on the environment.
Shield machine in China
The shield machine involved in the work of Shenyang Metro is called Pioneer, with a total length of 64.7 meters, a shield part of 9.08 meters, and a weight of 420 tons. Its working error does not exceed a few millimeters.
shield machine from China
Price: The shield machine imported from Germany costs about 50 million yuan, the shield machine imported from Japan needs more than 30 million yuan, and the price of the domestic shield tunneling machine is generally around 25-50 million.
The domestic shield machine with independent intellectual property rights in China is the domestic “863” series shield machine developed by Shanghai Tunnel Engineering Co., Ltd.
In July 2007, Geng Hongchen, chairman of NHI Group, formally signed an equity transfer agreement with the original shareholder of French NFM, successfully ending the two-year merger and acquisition negotiation with absolute control, enabling NHI to have the world’s most advanced full range of The core technology and well-known brand of tunnel shield machine.
Chinese shield machine
On November 14, 2015, the first large-diameter railway shield machine made in China, jointly developed by China Railway Construction Heavy Industry Group and China Railway 16th Bureau Group, rolled off the assembly line in Changsha. Technological monopoly will accelerate the pace of China’s rapid urbanization and construction of a large railway network. The large-diameter shield machine off the line this time has a diameter of 8.8 meters and a total length of 100 meters. The price of each machine is more than 20 million yuan cheaper than imported similar products. It has high-cost performance and good reliability. After the line, it will serve the Guangzhou-Zhuhai Intercity Rail Transit Line.
On March 13, 2018, the super-large diameter shield machine independently developed by China and exported overseas rolled off the assembly line of CCCC Tianhe Machinery Equipment Manufacturing Co., Ltd. This super-large diameter mud-water pressure balance shield machine with a diameter of 12.12 meters, will be used for China’s largest overseas shield road tunnel project – Bangladesh’s Karnapuri River Bottom Tunnel Project, which is also the largest diameter shield machine put into use in South Asia, ending the monopoly of Europe and the United States.
On June 18, 2020, the world’s largest earth pressure balance rectangular shield machine “Nanhu” with a width of 14.82 meters and a height of 9.446 meters was officially put into use in the tunnel project of Nanhu Avenue under the expressway ring line in Jiaxing urban area.
On December 22, 2021, the “Zhenxing”, the first domestic shield tunneling machine with a diameter of 15.01 meters and a super-large diameter of 15.01 meters, jointly developed by the China Railway 15th Bureau Group and the Railway Construction Heavy Industry Group, is suitable for the construction of ultra-shallow overburden and ultra-soft strata. offline.
On December 25, 2021, the “Greater Bay Area No.” shield machine applied to the deepest submarine tunnel in my country, the Pearl River Estuary Tunnel of the Deep River Railway, successfully started in Nansha, Guangzhou, officially starting the construction of challenging the 115-meter underwater crossing of the Pearl River estuary. . The “Greater Bay Area No.” shield machine will be used in the construction of the Pearl River Estuary Tunnel, the control project of the Zhenjiang Railway. A major transportation infrastructure built in the Bay Area, the main line is 116 kilometers long and passes through 5 cities including Shenzhen, Guangzhou, Dongguan, Zhongshan, and Jiangmen.
In February 2022, the shield tunnel with the highest water pressure and the largest diameter in China, which is under construction by the Tunnel Bureau of the CCCC First Public Bureau Group, is the shield machine “Juli No. 1” used in the Jiangyin Jingjiang Yangtze River Tunnel. The disk was successfully run down in Jingjiang, Jiangsu.
In March 2022, a major breakthrough was made in the construction of the Shanghai Airport Contact Line, and the “Qiyue” shield was successfully received, marking the arrival of the “Meifu Road Working Well-Huajing Station” section tunnel of the 3rd bid for the Shanghai Metro Airport Link Line. Connected across the board.
shield machine
In April 2022, the earth pressure balance shield machine manufactured by the central enterprise China Railway Equipment successfully passed the acceptance of overseas customers and was exported to Portugal for the first time.
On May 7, 2022, with the roar of a large transport vehicle, a remanufactured shield tunneling machine DL509X1 with a diameter of 6.6 meters was successfully loaded and shipped from the factory of Caofeidian Heavy Industry Machinery Company of China Railway 16th Bureau. This is the company’s third shield machine that has overcome the impact of the epidemic and has been remanufactured since the beginning of this year. It will be used for the construction of Guangzhou Rail Transit Line 10 in the future.
On June 15, 2022, the first shield machine exported from China to Portugal was shipped from Tianjin Port and officially sent to Lisbon. It contributed Chinese wisdom and Chinese solutions to the improvement of the underground drainage system of this ancient and modern city and the enhancement of flood control and waterlogging prevention. , China Power.
In September 2022, under the close cooperation of a 650-ton main crane and a 600-ton auxiliary crane, the 308-ton “Shentong” shield tunneling machine cutter head was slowly lifted from the ground to complete the “turn over”. “And went down well. This means that the excavation construction of the “Shanghai Track Crossing the First Tunnel of the Yangtze River” has officially started.
Glorysteelwork specializes in providing rail track system solutions for underground track construction. The business scope covers the steel rails required for the operation of the shield machine, the steel sleepers, to the entire subway track system.
