According to WeChat *** China Railway Construction", on the morning of December 16, the 14-meter-level super-large diameter shield machine "Yuanmeng" jointly developed by China Railway 14th Bureau and China Railway Construction Heavy Industry Co., Ltd. was successfully rolled off the assembly line in Changsha and will be used in the construction of the Suzhou East Tunnel of the new Nantong-Ningbo high-speed railway.
At the same time, the shield machine is equipped with a complete set of advanced technology of "push-spelling synchronization + synchronous double-liquid grouting + integral fully prefabricated box culvert synchronous assembly", which is the first application in the domestic super-large diameter shield equipment, which will comprehensively improve the safety of shield construction and the quality of forming tunnels, and the construction efficiency can be increased by 30%.
"Garden Dream" was unveiled off the assembly line.
Suzhou East Tunnel is located in Suzhou Industrial Park, Wuzhong District, with a total length of 15565 kilometers, is China's current construction standard, the longest mileage of 350 kilometers per hour high-speed rail urban tunnel, known as "China's urban high-speed rail tunnel". Of these, 13The 026-kilometer tunnel section is under construction by the 14th Bureau of China Railway, which includes 1182 km, designed as a single hole with two lines.
The construction of the shield section needs to pass through the complex urban environment such as 3 railways, 2 subway lines, 4 rivers and lakes, and 20 roads such as the Beijing-Shanghai high-speed railway, and pass through the soft soil, high water pressure and high permeability sandy strata for a long distance, with a maximum buried depth of 58 meters and a maximum water and soil pressure of more than 6 bar, which has high requirements for the overall tightness and reliability of the shield equipment.
In order to ensure the adaptability and efficient tunneling of the shield machine in complex formations, the builders made full use of the technical achievements and successful experience accumulated in the construction of crossing rivers, lakes and sea cities over the years, and created the "Yuanmeng" slurry balance shield machine through targeted and innovative design. The TBM excavates up to 14 with a diameter of 1481 meters, with a total length of 134 meters, a total weight of 4,200 tons, and a total installed power of 10,000 kilowatts.
"Yuanmeng" shield machine.
According to Yu Pengchen, the shield manager of the project, "Yuanmeng" is not only equipped with a number of domestic leading core technologies such as telescopic main drive, cutterhead cutter monitoring system, synchronous double-liquid grouting equipment, high-pressure shield tail, integral fully prefabricated box culvert synchronous assembly, box culvert fine adjustment, etc., but also successfully applied the self-developed new technology of "super-large diameter shield pushing and assembling at the same time", and the efficiency will be increased by 30% to 40% compared with the construction process of traditional shield "propulsion, stopping, and assembly".
The naming and design of the shield machine are also very characteristic of Suzhou. The name "Garden Dream" is a pun, implying that the "Garden City" relies on large shield technology to open up the underground high-speed railway network, greatly reducing the "interference" to the ground development of the core urban area, and realizing the dreamThe cutterhead is creatively coated with a "blue-collar" hairy crab wielding double pincers, which means that the shield machine can quickly adapt to the geological environment of the developed water system and achieve efficient tunneling.
Tongyong high-speed railway is an important part of the national "eight vertical and eight horizontal" high-speed railway network coastal corridor, from Yancheng to Nantong high-speed railway Nantong West Station, to the south through Suzhou City, Jiangsu Province, Jiaxing City, Ningbo City, Zhejiang Province, the introduction of Ningbo hub Ningbo Station, the line length of 301 kilometers, the design speed of 350 kilometers per hour. After its completion, it will greatly shorten the time and space distance between major cities in the core area of the Yangtze River Delta, which is of great significance for optimizing the layout of the Yangtze River Delta high-speed railway network, improving the national transportation network, promoting the higher-quality integrated development of the Yangtze River Delta, and realizing the complementary advantages of regional resources and comprehensive and coordinated development.