(NLDO) - Mud continues to push and spray up through some small holes and drainage pipes in alley 7, Giang Van Minh street, affecting many households.
This morning, February 21, mud continued to push and spray up from underground through some small holes and drainage pipes in alley 7, Giang Van Minh street, Kim Ma ward, Ba Dinh district, Hanoi. Dozens of workers and mud suction trucks continued to be mobilized to handle the incident.
Mud still filled alley 7 Giang Van Minh street on the morning of February 21.
It is known that in lane 7 Giang Van Minh street, there are about 30 households living. Before the incident, 15 households had temporarily moved to shelter, 3 households (potentially directly affected by underground construction) had handed over the site to the investor.
Previously, as reported by Nguoi Lao Dong Newspaper , at around 3:00 p.m. on February 20, residents in Lane 7, Giang Van Minh Street discovered a lot of mud and dirt rising from the drainage manholes, so they reported it to the authorities. This is the area where the underground section of the urban railway line No. 3, the Nhon - Hanoi Railway Station section, is being constructed.
Hanoi Urban Railway Management Board (MRB) - the investor said that as soon as the tunneling additives were discovered being sprayed on the ground at Lane 7, Giang Van Minh Street, the investor, the joint venture of contractors Hyundai & Ghella and the supervision consultant quickly deployed measures in accordance with technical procedures to fix the incident, ensuring safety and environmental sanitation in the surrounding area. By 9:00 p.m. on February 20, the units had mobilized 6 mud suction trucks, 2 road cleaning trucks, and more than 100 workers.
Workers are still working on the problem.
"The Hanoi Urban Railway Management Board sincerely apologizes for any inconvenience that may have been caused during the construction process and hopes to receive the understanding and cooperation of local residents," MRB said.
Regarding the cause, MRB said it could be due to the existence of old wells or sewers underground that created a path for the tunneling additives to flow up to the surface (these old wells and sewers are no longer in use).
Investor MRB apologizes to residents for the incident
According to the project process, before the tunnel construction, the consultant and contractor conducted a survey of the works along the route. However, due to the change of ownership of the works over time, many information were not fully provided, so it was inevitable that there was still a lack of data on underground works such as water wells, residential wells, or geological survey boreholes from previous projects that were not filled. During the drilling process, tunneling additives were sprayed under pressure to stabilize the soil in front of the excavation face. When encountering open holes such as water wells or boreholes, the tunneling additives will flow up to the ground surface through these voids.
Mud overflows from the sewers
According to MRB, this phenomenon only occurs for a short time and ends immediately after the TBM drills through and installs the tunnel lining. This is a common phenomenon during the construction of urban tunneling projects.
The investor confirmed that the above phenomenon did not affect the structure of the project nor did it cause any damage to people or property. MRB is working closely with relevant units to accurately assess the cause and deploy technical measures to prevent similar incidents in the next phase.
Urban railway project No. 3, Nhon - Hanoi station section is 12.5 km long, with 8 elevated stations and 4 underground stations. Of which, the elevated section Nhon - Cau Giay is 8.5 km long (in commercial operation), the underground section Cau Giay - Hanoi station is 4 km long.
The project started in 2009 and was scheduled to be completed in 2015, but the schedule was delayed many times and is expected to be completed in 2027.
Source: https://nld.com.vn/suoi-bun-dat-van-phun-trao-giua-khu-dan-cu-noi-do-ha-noi-chu-dau-tu-xin-loi-19625022112084875.htm
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