With the roar of the machine, the cutter head of “HONGPU” shield machine rotates slowly, and the shield machine of bid 11 of Shanghai New Municipal Railway airport connecting line successfully started today. So far, four 14 meter diameter super large shields and two 9-meter diameter super large shields on the airport connecting line have gathered underground, marking that the construction of the East-West fast track project connecting Pudong and Hongqiao has entered a comprehensive acceleration stage.
The airport connecting line project has a total length of 68.6km, including Hongqiao Station (existing), Qibao station, Huajing station, Sanlin south station, Zhangjiang station, Resort Station, Pudong Airport Station, Pudong Airport planned terminal station and Shanghai east station, with an average station spacing of 8.6km. It is expected to be completed in 2024.
As the main underground city line, the shield construction of airport connecting line is faced with many difficulties, such as large excavation section, complex geological conditions, crossing operation tracks and buildings, high safety risk and great construction difficulty. For example, the tunnel of Lot 3 crosses the downward line and upward line of rail transit line 15 from west to East, and the minimum vertical clear distance is only 7.5m; The minimum vertical distance between Lot 8 tunnel and Pudong confluence sewage pipe is only 5m. This has high requirements for the attitude control of the shield machine. Once the attitude deviates, it is easy to cause damage to the pile foundation, overhead, ground existing lines, bridges, etc.
In view of these difficulties, the investor and builder Jiushi Group Shanghai shentie invited an expert team to conduct targeted research and innovative design of the shield machine. According to the construction environment and geological conditions, the best configuration model suitable for the actual construction scene is created for the airport connecting line.
At the same time, BIM platform (building information model) is developed to simulate and deduce the whole process of shield tunneling. The intelligent detection system is used throughout the line to achieve real-time monitoring, real-time storage and real-time analysis of the surrounding environment, geological conditions and potential risks in the excavation process, adjust various parameters of shield construction according to data changes, and gradually form intelligent shield construction.
“By constructing the distributed data network architecture of shield intelligent application and adopting big data calculation, AI prediction and other technologies, the ‘HONGPU’ shield machine of bid 11 realizes the independent tunneling, automatic cruise and intelligent management of shield machine, and innovatively forms a new model of single person one click intelligent tunneling.” Introduction of relevant person in charge of Shanghai shentie.
It is worth mentioning that the whole line of the airport connecting line adopts the full prefabrication and assembly construction technology, and the tunnel is no longer “dusty”, which can not only make the construction link more green, environmental protection and energy saving, but also improve the efficiency of Shield operation. “This has extremely high requirements for the construction technology. Millimeter level control needs to be achieved in all stages of shield segment assembly, and no error is allowed in each process.”
(last news)
