The Liberec Tunnel forms part of the city’s main central traffic artery and is located in the immediate vicinity of Liberec’s main railway station and central bus station. The structure consists of two one-way tunnel tubes, measuring 280 m and 240 m in length respectively, each with two traffic lanes. The rehabilitation work was carried out from March to December 2025. The client was Ředitelství silnic a dálnic s. p., the Road and Motorway Directorate of the Czech Republic. Construction was performed by EUROVIA CZ a.s. as the general contractor and FREYSSINET CS a.s. as the specialist contractor responsible for the repair work.

Challenging substrate preparation due to existing coating

A structural survey identified various types of damage. These included cracks in the concrete, corrosion damage to the reinforcement, spalling of the concrete cover, and moisture ingress in walls and beams. Before the actual rehabilitation work began, several test areas were prepared to assess the condition of the existing structure and verify the effectiveness of the proposed methods. Removing the original tunnel coating proved particularly challenging, as it was extremely resistant. To achieve the required substrate quality, the coating ultimately had to be removed completely by abrasive blasting. Following substrate preparation, various MC products were used for concrete repair and surface protection.