The Shanghai Nanjing Yangtze River High Speed Railway Paves a New Route to the Yangtze River Delta
2023-10-18
7 processes and methods have been successfully applied, 28 new materials have been granted patents by the state, and China's first high-speed railway with a large-scale application of a 40 meter box girder has been fully covered by 5G signals. Recently, the Shanghai Nanjing Yangtze River High Speed Railway, which has been put into operation, is full of technological innovation technologies and officially flies "close to the ground" between Shanghai and Nanjing. Dragon soars on the Yangtze River, creating a beautiful dream in Jiangnan. On the occasion of the fragrance of osmanthus and the color of hibiscus in autumn, the Shanghai Nanjing Yangtze River High Speed Railway has been put into operation, connecting multiple top 100 counties and districts in the southern Yangtze River region of Jiangsu into a chain, filling the gap in the high-speed rail network in the southern region of Jiangsu. Jiangsu Jurong, Jintan, Wujin, Jiangyin, Zhangjiagang, Changshu, and Taicang will also officially integrate into the "1-hour transportation circle" of Shanghai and Nanjing, which is of great significance for accelerating the construction of a comprehensive three-dimensional transportation corridor along the Yangtze River in Jiangsu, promoting the integration of the Yangtze River Delta, and high-quality development of the Yangtze River Economic Belt. The super large box girder enhances the flexibility of bridge layout. The main line of the Shanghai Nanjing Yangtze River High Speed Railway is 279 kilometers long, with a design speed of 350 kilometers per hour. It starts from Nanjing in the west, runs through the entire Jiangsu South Yangtze River region, and ends at Suzhou Taicang in the east, connecting Shanghai. Previously, China's high-speed railway construction with a speed of 350 kilometers per hour mostly used ballastless 32 meter simply supported box girders. In contrast, the length of the 40 meter box girder has increased by 8 meters, the span between bridge piers has increased by 7.8 meters, the beam height has increased by 20 centimeters, and the weight of the beam has jumped to the 1000 ton level. The Shanghai Nanjing Yangtze River High Speed Railway is the first high-speed railway in China to use a 40 meter box girder construction on a large scale. Compared to using a 32 meter box girder construction, it reduces the number of bridge piers by 20%, improves the ability to cross roads and rivers, effectively saves project land, and significantly reduces construction costs. "Zhou Wei, Deputy Minister of the Party Committee Propaganda Department of the State Railway Shanghai Bureau Group, introduced. The number of piers of the Gehu Bridge, which passes through the Shanghai Nanjing Yangtze River High Speed Railway, has been reduced from 240 to 198, effectively reducing the water surface area by 17.5%. Wang Hu, Director of the Engineering Management Department of the Nanjing Railway Hub Construction Command, told Science and Technology Daily that the super large box girder further improves the flexibility and construction efficiency of bridge layout in complex areas such as river and road crossings. Meanwhile, a 40 meter box girder can reduce more bridge pier connection resonance points compared to a 32 meter box girder, allowing high-speed trains to reach higher operating speeds. In order to successfully erect a massive object weighing up to a thousand tons onto the bridge piers, the construction unit introduced a new type of gantry crane with a thousand ton box girder. The new type of bridge erecting machine can achieve information control. For example, the main support legs of the bridge erecting machine are equipped with horizontal force sensors and automatic pin systems, which can timely sense the force on each support leg, ensuring that the bridge erecting machine passes through holes and feeds beams more safely and reliably. "Chen Wei, Deputy General Manager of the Production Management Department of China Communications Second Navigation Bureau and Manager of the Shanghai Nanjing Yangtze River High Speed Railway Project, introduced that the bridge erecting machine is also equipped with a full working condition safety monitoring system, All operational data and fault information can be displayed on the human-machine interface, and the entire process can be traced. At the same time, the project department has introduced a new type of beam transport vehicle. Chen Wei introduced that the new type of beam transport vehicle adopts Beidou satellite positioning autonomous driving technology and intelligent electronic control speed control engine fuel saving technology. When the vehicle encounters slopes or curves during driving, it can automatically adjust the driving route, which is safe, reliable, and more efficient. Breaking through the problem of communication coverage across long water surfaces in high-speed railway construction along the Yangtze River in Shanghai and Nanjing, the bridge tunnel ratio is as high as 95
Edit：He Chuanning Responsible editor：Su Suiyue
Source：Sci-Tech Daily
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