This morning (February 21), dozens of workers and sludge suction trucks continued to be mobilized to lane 7 Giang Van Minh street to fix the problem of overflowing additives in the Nhon - Hanoi Railway Station metro tunnel.

Speaking with VietNamNet reporters, a representative of the Hanoi Urban Railway Management Board (MRB) - the investor, said that this unit and experts have agreed to reduce the speed of the Nhon - Hanoi Railway Station metro tunnel boring machine to assess issues related to the incident.

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Mud from the Nhon - Hanoi Railway Station underground metro tunnel is still everywhere in lane 7, Giang Van Minh street. Photo: Quang Phong

“After the excavator slows down and the pressure from below is gone, the additive will not overflow to the ground surface,” said an MRB representative.

This morning, experts on the Nhon - Hanoi metro tunnel and MRB met to carefully examine the impacts of the incident of tunnel additives overflowing onto the ground.

It is known that Lane 7, Giang Van Minh Street has more than 30 households living there. Before the incident, 15 households had temporarily moved to shelters, 3 households (potentially directly affected by tunnel construction) had handed over the site to the investor.

Previously, at around 3:00 p.m. on February 20, residents in lane 7, Giang Van Minh street discovered a lot of mud and dirt flowing from the drainage manholes, so they reported it to the authorities.

This is the area within the underground section of urban railway line No. 3, Nhon - Hanoi station section. This underground section is under construction.

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People cleaning up in lane 7, Giang Van Minh street. Photo: Quang Phong

MRB said that as soon as the incident was discovered, the investor, the joint venture contractor Hyundai & Ghella and the supervision consultant quickly deployed handling measures in accordance with technical procedures to fix the problem and ensure safety and environmental sanitation.

By 9:00 p.m. on February 20, the units had mobilized 6 sludge suction trucks, 2 road washing trucks and more than 100 workers.

MRB said the cause could be due to the existence of old wells or sewers underground that created a path for tunneling additives to flow to the surface.

According to the project process, before tunnel drilling, the consultant and contractor conducted a survey of the works along the route.

Tunneling additives for the underground section of the Nhon-Hanoi metro station suddenly rose to the surface

Tunneling additives for the underground section of the Nhon-Hanoi metro station suddenly rose to the surface

The Hanoi Urban Railway Management Board (MRB) has just officially informed about the phenomenon of tunneling additives in the underground metro section Nhon - Hanoi station suddenly spraying onto the ground, overflowing into alley 7 Giang Van Minh.
After 6 months of operation, Nhon - Hanoi Railway Station Metro served nearly 3.4 million passengers.

After 6 months of operation, Nhon - Hanoi Railway Station Metro served nearly 3.4 million passengers.

After 6 months of commercial operation, the Nhon - Hanoi Railway Station elevated section Nhon - Cau Giay has transported nearly 3.4 million passengers.
Close-up of the second 'giant' robot starting to dig a 10m/day tunnel on the Nhon - Hanoi station line

Close-up of the second 'giant' robot starting to dig a 10m/day tunnel on the Nhon - Hanoi station line

The management board, together with the consulting unit and contractors, have started drilling the tunnel using the second TBM named "Bold" for the underground section of the Nhon - Hanoi Railway Station urban railway line.