Overcoming landslides at Nam Dan 2 culvert
At 6:30 p.m. on April 4, 2011, at the construction site of the Nam Dan Sluice and Canal System Upgrade and Expansion Project (Xuan Hoa Commune, Nam Dan District), a landslide suddenly occurred on the foundation pit upstream of the sluice and the boat lock with a rather large slope, causing the tourist route along the Lam River to be blocked. Fortunately, when the incident occurred, there were no vehicles passing through and it was during the construction break, so there were no casualties.
At 6:30 p.m. on April 4, 2011, at the construction site of the Nam Dan Sluice and Canal System Upgrade and Expansion Project (Xuan Hoa Commune, Nam Dan District), a landslide suddenly occurred on the foundation pit upstream of the sluice and the boat lock with a rather large slope, causing the tourist route along the Lam River to be blocked. Fortunately, when the incident occurred, there were no vehicles passing through and it was during the construction break, so there were no casualties.
The Nam Dan sluice and canal system upgrade and expansion project is a large-scale irrigation project in Nghe An, aiming to help overcome drought in a key rice area in Nam Dan - Hung Nguyen - Nghi Loc districts and Vinh City. Mr. Cao Danh Phu, Deputy Director of Nam Irrigation One Member Co., Ltd. said: "The Nam Dan II sluice irrigation project is invested by the Nghe An Department of Agriculture and Rural Development with a total investment of 500 billion VND. Nam Nghe An Irrigation One Member Co., Ltd. is the unit that plays the role of Project Management Board, the design unit is the Technology Transfer Consulting Company of the University of Water Resources and the winning bidder is Hoa Hiep Co., Ltd. (general contractor) in a joint venture with 2 companies: Hai Phong Irrigation Construction Company and Nghe An Irrigation Construction Joint Stock Company I. The cause of the incident was due to weak ground, heavy traffic and heavy loads, and months of rain that made the foundation pit roof soil wet...". Mr. Tran Dinh Nga, consultant and supervisor - Thang Long Consulting and Construction Joint Stock Company added: The slide is 73 meters long, 14 meters wide on average, and 3 meters high. The total volume of landslides is about 3,100 m3.3.
Workers are adjusting the Larsen piles and backfilling with hill soil.
On the morning of April 6, 2011, at the Nam Nghe An Irrigation One Member Co., Ltd., the responsible agencies met to discuss how to handle the above serious incident. The immediate solution is to not allow vehicles to pass through the construction area. Rebuild the cofferdam with a slope coefficient higher than the old foundation pit roof using hilly soil, with dike bases at elevations (+6.00) and (+300); dig a soil column at the same level as the existing foundation pit, bend and adjust the Larsen sheet piles, rebuild with hilly soil and compact thoroughly.
Ngoc Anh
