“In the construction, we pioneered the key technology of subway crossing large-thickness collapsible loess. Through large-scale water immersion test and collapse mechanism analysis, we revised the calculation formula of self-weight collapsible amount, and According to the research of engineering characteristics, the design method of ‘without foundation treatment and without pressing the rail surface’ has been formed, thus saving 150 million yuan in project cost, and also providing a reference for high-speed railways, highway tunnels and other similar projects.” April 11 As the first rail transit project in the five northwestern provinces to win the Zhan Tianyou Award, Yang Xiaoqiang, deputy chief engineer of Xi’an Rail Transit Group Co., Ltd., told reporters the story behind the construction of Xi’an Metro Line 4.
(“Tenth The 9th China Civil Engineering Zhan Tianyou Award” trophy)
After winning the National Quality Engineering Award in 2020, the Xi’an Metro Line 4 project has once again won National Engineering Award – The 19th China Civil Engineering Zhan Tianyou Award. The reporter learned that the China Civil Engineering Zhan Tianyou Award is the highest honor award for scientific and technological innovation in the field of civil engineering in my country. The “Oscar” award in the world is self-evident.
As a north-south backbone line, Xi’an Metro Line 4 connects Xi’an Railway Station, North Railway Station, airport intercity and other large-scale comprehensive transportation hubs; The total length of the line is 35.2km, all of which are underground lines, with 29 stations, 11 of which are transfer stations, with a total investment of 23.822 billion yuan. “During the construction, we have firm confidence to overcome difficulties and seek progress while maintaining stability and innovation. In terms of line selection, Metro Line 4 is highly integrated with the city’s Jiugongge planning, passing through the ancient city, connecting new districts, and connecting hubs, with significant passenger flow benefits.” Yang Xiaoqiang said, The passenger flow intensity of the subway network ranked first in the country in 2018 and 2019, and ranked third and fourth in the country in 2020 and 2021, respectively.
(Metro Line 4 Dayan Pagoda Station)
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(Metro Daming Palace Station Cultural Landscape Wall–Wanguolaiyi )
Take Metro Line 4, you can find that the line goes around the Big Wild Goose Pagoda, the ancient city wall, adjacent to the Daming Palace, and also involves Dacien Temple, Five national cultural relics including Dong Zhongshu’s tomb… When the Xi’an Metro and historical relics are “in the same frame”, in order to protect the cultural relics resources from being affected, the city rail group for the first time proposed a complete set of subway projects and cultural relics. Development concepts and methods. “Near” means that the subway station is close to the cultural relics, which is convenient for passengers to watch the cultural relics, and “not entering” means that the line does not pass through the cultural relics; it has innovatively developed key technologies for vibration control of ancient buildings, and won the first prize for scientific and technological progress in Shaanxi Province.
As the subway construction presses the “accelerate button”, the track construction process continues to upgrade. It is worth mentioning that for the 13 passages of the line through ground fissures, the builders have innovated the subway “riding seam” setting mode and waterproof technology, and realized the fortification concept of “segmented processing, reserved clearance, flexible joints, and special waterproofing”. , to ensure the safety of line operation. In addition, the subway builders have also conquered the key technologies of 29 tracks and 12 groups of turnout groups in the throat area of Xi’an Railway Station by overcoming the large-section shallow buried tunnels in the saturated soft loess stratum.
(Subway No. 4 Line Feitian Road Station)
In the station design of Metro Line 4, the island-style separation of Xi’an Railway Station is created—the tunnel first and then the station , Station integration design scheme of multi-network integration. “In order to avoid the Daming Palace ruins, combined with the reconstruction of Xi’an Railway Station, the station is set obliquely right below the throat area of the National Railway. It adopts an integrated design with the National Railway Hub, and adopts a separate island type – the tunnel first and the station plan to realize the transfer on the same floor. , the subway and the national railway transfer use a dedicated one-way path, which is seamlessly connected with the national railway rapid entry hall.” Yang Xiaoqiang introduced that the subway Line 4 station is decorated with the theme of “Silk Road Chang’an”. The combination of corridors and the integrated expression technique of heaven, earth and wall show the prosperous times of Han and Tang Dynasties and modern civilization for citizens and tourists.
It is reported that the Xi’an Metro Line 4 project has won 1 National Quality Engineering Award and the first prize of Shaanxi Provincial Science and Technology Progress Award. It has won 13 high-level scientific and technological progress awards, and the innovative technology of rail transit from Xi’an has been promoted and applied in the construction of subways in many cities.
Text: Guo Peiran, Omnimedia Reporter of Xi’an Newspaper Industry Photo: Reporter Li Ming