On September 4, the Hanoi Urban Railway Management Board informed about the progress of the No. 3 urban railway project, Nhon - Hanoi Railway Station section.
According to Mr. Nguyen Cao Minh, Head of Hanoi Urban Railway Management Board, the elevated section including the Depot and the Nhon - Cau Giay route has been completed and put into commercial operation since August 2024.
After more than a year of operation, the system serving people is safe and of good quality. However, the underground section due to previous land clearance problems is still under construction.
To date, the overall progress of the underground section has reached 51.01%. Of which, CP03 package (construction of tunnels and underground stations) reached 64.38%; CP06, CP07, CP08, CP09 equipment packages are currently being designed, waiting for site handover from CP03.
According to Mr. Minh, CP03 package is 4 km long with 4 underground stations. At present, all 4 stations have been constructed to the bottom using Top-Down technology. The sections of the tunnel connecting the station are dug with 2 TBM drilling machines using soil pressure balance technology.
TBM No. 1 started from July 31, 2024, has dug 2,040/2,572 m, and is constructing the section from S11 Station - Quoc Tu Giam, expected to be completed at S12 Station by the end of October 2025.
TBM No. 2 started from February 3, 2025, has dug 1,158/2,580m, expected to be completely completed at S12 station by February 2026.
Mr. Minh emphasized: After completing the tunnel drilling and dismantling the TBM, the contractor will hand over the site to deploy the installation and testing of equipment. The management board is working with Systra consultants and contractors to negotiate an integration progress.
Although Hanoi's geology is complicated and the machines have to be stopped many times for technical handling, the construction still ensures quality, safety and strictly complies with project standards.
According to the contractor's representative, the pair of TBMs of the project were specially designed by Herrenknecht (Germany), over 100 m long, weighing about 850 tons, operated by more than 150 engineers and workers. The excavator follows a closed cycle, with a maximum speed of 60mm/minute.
During the excavation, the FOAM spraying machine at the front end of the cutting to soften the soil, prevent binning and stabilize the pressure. At the rear of the machine, the fat spraying system protects the brush, protects against water seepage, and puts in mortar to fill the gap between the tunnel shell and the soil, limiting subsidence.
Immediately after digging, the robot mounted the tunnel lining behind, each piece consisting of 6 pieces, completed in 30 - 35 minutes. The process of digging and installing tunnel shells takes place continuously.
