This is the largest cofferdam designed for the construction of the central pylon of the bridge crossing over the Lena River in the Republic of Sakha (Yakutia). Over two hundred guide pipes will form the precise geometry of the future foundation of the riverbed pier and ensure drilling control in challenging hydrological conditions.
To date, all pipes have been installed in their designed positions; all of them are over 10 meters tall. The high density of the pile field is due to both the calculated loads and the complex soil characteristics. Bored piles will be installed through the guide pipes into the pylon foundation on the riverbed. Construction workers have also begun installing two sling frames designed to accommodate the winch equipment that will position the cofferdam in the riverbed.
At a nearby site, the side cofferdam of pier #10 is fully assembled and ready for floating. When spring flooding occurs, the plan involves moving it to its installation site on the right bank. Planning for this complex operation has begun in collaboration with river fleet companies and the Ministry of Transport and Roads of Yakutia.
Active work continues on both banks. Construction workers are simultaneously drilling for the piles of the right-bank approach piers, and 122 drilling pumping stations have been installed. On the left bank, reinforcement of the grillage of the fifth pier continues, and the pile caps of the sixth pier are being cut. A total of 380 people and 90 pieces of specialized equipment are engaged at the site, and work is being carried out continuously.
VIS Group is the investor, concessionaire, and general contractor for the construction of the Lena Bridge, overseeing the entire lifecycle of one of the largest concession projects in modern Russia. In 2025, it was included in the “Infrastructure for Life” national project. The concessionaire is the government of the republic, and Sber is the financial partner. The project is being implemented with regard to the strict requirements for the reliability and stability of structures in the Far North and challenging ice conditions. This will be the world's first cable-stayed bridge built on permafrost soil.
To date, all pipes have been installed in their designed positions; all of them are over 10 meters tall. The high density of the pile field is due to both the calculated loads and the complex soil characteristics. Bored piles will be installed through the guide pipes into the pylon foundation on the riverbed. Construction workers have also begun installing two sling frames designed to accommodate the winch equipment that will position the cofferdam in the riverbed.
At a nearby site, the side cofferdam of pier #10 is fully assembled and ready for floating. When spring flooding occurs, the plan involves moving it to its installation site on the right bank. Planning for this complex operation has begun in collaboration with river fleet companies and the Ministry of Transport and Roads of Yakutia.
Active work continues on both banks. Construction workers are simultaneously drilling for the piles of the right-bank approach piers, and 122 drilling pumping stations have been installed. On the left bank, reinforcement of the grillage of the fifth pier continues, and the pile caps of the sixth pier are being cut. A total of 380 people and 90 pieces of specialized equipment are engaged at the site, and work is being carried out continuously.
VIS Group is the investor, concessionaire, and general contractor for the construction of the Lena Bridge, overseeing the entire lifecycle of one of the largest concession projects in modern Russia. In 2025, it was included in the “Infrastructure for Life” national project. The concessionaire is the government of the republic, and Sber is the financial partner. The project is being implemented with regard to the strict requirements for the reliability and stability of structures in the Far North and challenging ice conditions. This will be the world's first cable-stayed bridge built on permafrost soil.
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