On the section of the future Moscow – St. Petersburg high-speed railway from Zelenograd to Novaya Tver, the construction of 610 supports for bridge structures has been completed. The work is being carried out by "Natsproektstroy" company, which is leading one of the key stages in forming the infrastructure of Russia's first high-speed route of this class.
This refers to a large-scale cycle of support structures for bridges, overpasses, and viaducts, which will form the basis for the HSR to pass through complex terrain and water obstacles. In total, 51 artificial structures are planned to be built on this section, and the total number of supports will exceed 1100 units.
The construction of one support takes an average of about two months. Depending on the geology and elevation marks of the route, the height of the structures varies from 1.5 to 20 meters. In some cases, for example, when crossing rivers, parameters are calculated taking into account the water level and hydrological conditions.
A pile foundation is formed for each support – driven or bored piles are used. Their immersion is carried out based on the results of dynamic and static soil tests, and the depth can reach 27 meters, which is comparable to the height of a nine-story building. This ensures the necessary bearing capacity for high-speed loads.
After the piles are installed, a grillage is formed – a reinforced concrete slab that combines the piles into a single system and redistributes the load from the span structures. Then, the rebar cage is formed, and the body of the support is concreted. Depending on the height of the structure, this stage takes from 7 to 20 days.