Tunnels are long-term infrastructure investments, often remaining in service well beyond their original design life. Over time, harsh conditions (especially water infiltration) can accelerate the deterioration of structural and functional systems. We provide targeted tunnel repair solutions to restore performance and extend service life.
Tunnel maintenance requires a careful balance between preventive and corrective strategies. Best practices suggest that 70-80% of maintenance should be preventive to ensure long-term performance and safety. Refurbishment becomes necessary when tunnels near the end of their service life or when structural updates are required due to evolving traffic demands, new regulations, fire damage, or shifting ground conditions.
Tunnel environments present unique challenges that demand specialized planning and execution.
Tunnel work involves limited lighting, restricted access, and potential exposure to hazardous air and fire risks. Strict safety protocols and risk management plans are essential to protect workers.
Full tunnel closures offer the safest conditions for major upgrades. However, when tunnels must remain partially open, detailed traffic management plans are required to ensure safety for both users and crews.
Excavation and vehicle movement generate airborne particles like silica dust and diesel fumes. Crews must use protective gear, which can reduce mobility and increase fatigue, adding complexity to the job.
Tunnels offer limited space for equipment and materials. Just-in-time delivery and precise coordination are critical to avoid delays and maintain safety on site.
With over 70 years of experience in tunnel repair and reinforcement, we support your project from the earliest stages. Our team provides structural analysis, condition assessments, and tailored solution design to ensure every aspect of the project is considered from the start.
Freyssinet USA can act as a general contractor or subcontractor for tunnel maintenance, repair, strengthening, and protection. We also leverage advanced photogrammetry tools from Sixense (our sister company) to map structural defects, prioritize repairs, and generate precise work plans.
Freyssinet provides tunnel repair services for large-scale programs involving masonry and concrete railway and roadway tunnels. Our expertise covers complex conditions such as emergency interventions, limited access, and work under active traffic. Each tunnel repair project is supported by strong engineering input and tailored solutions.
Solutions provided:
Freyssinet carried out tunnel repair and enlargement for a masonry railway tunnel to support electrification, under a full design-build contract.
Scope of work:
We provide fire protection solutions designed to safeguard both steel and concrete structural elements in underground transit environments.
Our solutions include:
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