According to the official wechat news of China National Railway Group, on November 1, Jinxiu tunnel, a key and difficult control project of Chengdu Zigong High Speed Railway (hereinafter referred to as Chengdu Zigong High Speed Railway), started excavation in Chengdu, Sichuan, which marks the first time that China's largest diameter earth pressure balance shield machine "Jinxiu" with completely independent intellectual property rights has been put into use in the construction of high speed railway, It has laid a solid foundation for the early completion of the whole line of Chengdu Ziyang high-speed railway. (Chengdu Zigong High Speed Railway. Drawing provided by Chengdu Lanzhou Railway Bureau) It is reported that Chengdu Zigong high-speed railway, with a total length of 176km, is an important part of the Beijing Kunming channel, the main channel of the "eight horizontal and eight vertical" high-speed railway network in the national medium and long term railway network planning. It is the first high-speed railway with a design speed of 350 km per hour in Sichuan Province, with stations in East Chengdu, Chengdu Tianfu, Tianfu airport, West Ziyang, Qiuxi, Weiyuan and Zigong. (Chengdu Zigong High Speed Railway. Drawing provided by Chengdu Lanzhou Railway Bureau) The Jinxiu tunnel of Chengzi high-speed railway is 3655m long and the shield tunnel is 2620m long. The geology of the tunnel is mainly weakly weathered mudstone. It crosses municipal roads, rail transit lines, existing railways and urban high-rise buildings, with a maximum buried depth of 60m. (Chengdu Zigong High Speed Railway. Drawing provided by Chengdu Lanzhou Railway Bureau) The tunnel is a single tunnel and double track tunnel. At present, there is no earth pressure balance shield machine with appropriate size in China. The "Jinxiu" large-diameter shield machine specially designed for this project has a total length of 135 meters, an excavation diameter of 12.79 meters, a total weight of 3000 tons and an installed power of 7500 kW. The process of shield propulsion, excavation and segment assembly can realize automatic operation with low labor intensity. It is expected to dig 9 meters per day. (Chengdu Zigong High Speed Railway. Drawing provided by Chengdu Lanzhou Railway Bureau) According to the relevant person in charge, after the completion of Chengdu high-speed railway, it is of great significance for Chengdu and the areas along the line to accelerate their integration into the development strategy of the Yangtze River economic belt, promote the process of western development, and promote regional cooperation and development. In addition, because the cutter head of the shield machine of the project is painted as a giant panda with tender bamboo in its arms, it is cute and lifelike. Therefore, it is called "the most cute big country heavy weapon" and "Kung Fu Panda" by netizens. (outlook new era)
Edit：Ming Wu Responsible editor：Haoxuan Qi
Source：people.cn
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