What is at the tunnel shell manufacturing site serving the TBM robot of the Nhon - Hanoi Railway Station Metro line?
Báo Tin Tức•15/08/2024
The tunnel lining of the Nhon-Hanoi Railway Station Metro Line is manufactured at the AMACCAO Ha Nam factory. The total number of tunnel lining rings of the project is 3,488 rings, including 120 heavy-duty steel rings, 30 monitored rings and 3,338 standard steel rings.
The Hanoi Urban Railway Management Board (MRB) said that the urban railway (Metro) project No. 3, Nhon-Hanoi Railway Station section has more than 4 km underground. Since July 30, the tunnel boring robot TBM No. 1 has started at S9 Kim Ma station and is moving deep underground, towards S12 Tran Hung Dao station. The special feature of this TBM is that wherever it is drilled, the tunnel lining will be installed right there. Close-up video of the tunnel lining production process for the TBM robot:
Mr. Nguyen Van An, Deputy General Director of AMACCAO Ha Nam factory, said that the 4 km underground route of Nhon Metro will use up to 3,488 tunnel lining rings. Tunnel lining (Tunnel Lining Segments) is manufactured in Ha Nam province and transported by specialized vehicles to S9 Kim Ma station (Hanoi). According to Mr. Nguyen Van An, the requirement for the tunnel lining's lifespan must be 100 years, so the input materials, control, manufacturing and aesthetic image completion must meet very high standards. To meet the project's schedule, the factory is currently operating 2 production lines 24/7. It is expected that by the end of the first quarter of 2025, the factory will complete this tunnel lining production stage. 3,488 tunnel lining rings of Nhon Metro Line were produced at AMACCAO factory in Ha Nam province. The tunnel lining production process includes 10 stages: Design and planning, material preparation and material quality control, formwork inspection and acceptance, steel reinforcement installation, concrete pouring, concrete curing, demoulding and quality control, finishing and surface treatment, coating the tunnel lining with waterproof paint, and installing tunnel lining accessories.
This tunnel lining manufacturing package has a total value of more than 276 billion VND, with MRB as the investor, Hyundai - Ghella joint venture as the general contractor; the consulting unit is Systra SA (France).
Raw materials for tunnel lining production include: Cement, steel, aggregates (stone, sand), water, additives and other accessories.
Concrete quality requires strict standards, the aggregate weighing process has very small errors (0.5% to 2% depending on the material).
Concrete is mixed using an automatic batching plant according to computer-programmed mix proportions, then poured into reinforced molds, using vibrating techniques to remove air bubbles and ensure even distribution of the concrete.
The concrete is then cured according to technical procedures by keeping it moist and controlling the temperature to ensure strength and quality.
Once the concrete has reached the required strength, the team of workers will remove the mold and check the quality and technical parameters such as size, flatness, and compressive strength.
The concrete surface is treated to ensure smoothness and aesthetics, the tunnel shell is covered with 2 layers of waterproof paint, each layer is ≥ 100µm thick. The curing time can last from a few hours to a few days, depending on the specific conditions, on average about 8 hours.
The final step is to install the tunnel lining accessories including: waterproof gaskets, guide bars and hardwood panels.
Tunnel lining segments are inspected and accepted.
The total number of tunnel lining rings of the project is 3,488 rings, including 120 heavy reinforcement rings, 30 monitored rings and 3,338 standard reinforcement rings. The largest tunnel lining plate weight is 4 tons.
The tunnel shell transportation process over a distance of 71 km (from Ha Nam to Station S9 Kim Ma - Hanoi) includes 5 stages.
If any damage is detected, repair and maintenance measures will be taken immediately to ensure the quality of the tunnel lining before installation.
The TBM has now gone more than 50 meters underground; wherever it drills, the tunnel linings are installed by the machine.
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