General Management
HCC Spain
Underground works
Underground works present unique technical challenges derived from the geotechnical complexity of the ground, the presence of pressurised water, rock mass fragmentation and the access limitations typical of natural caves, tunnels and technical cavities. HCC develops advanced consolidation, waterproofing and stabilisation interventions that combine geotechnical diagnosis, structural injections and leakage sealing, prioritising structural safety, durability and minimal alteration of environmentally sensitive areas.
Underground works
Underground works involve specific technical challenges arising from ground conditions, the presence of pressurised water, rock mass fragmentation and the access limitations typical of natural caves, tunnels and technical cavities. These conditions require precise, discreet interventions fully adapted to the geotechnical behaviour of the environment.
At HCC we have extensive experience in the stabilisation, consolidation and waterproofing of underground infrastructures, applying methodologies that combine geotechnical diagnosis, structural injections, leakage sealing and rock mass reinforcement techniques. Our approach prioritises structural safety, durability and environmental compatibility, especially in highly sensitive areas.
Our main lines of work include the reinforcement of natural caves and the waterproofing of tunnels, two areas that require specific solutions and technologies designed to operate under limited access, water presence and complex geometries.
Types of intervention in underground works
Natural caves reinforcement
The stability of natural caves depends on rock mass behaviour, water presence, crack evolution and the interaction between layers. HCC applies advanced consolidation techniques through structural injections, creation of self-supporting crowns and local reinforcement, ensuring safety and minimal alteration of environmentally sensitive cavities.
More informationTunnels waterproofing
Tunnels often present leakages that can deteriorate the lining, generate voids, cause reinforcement corrosion and compromise load-bearing capacity. HCC performs advanced sealing using high‑resistance epoxy resins, backfill consolidation and injections in joints and cracks under pressurised water conditions, ensuring durability and full functionality of the infrastructure.
More information
Structural integrity in underground environments
Hm³ recovered
> 9800
avoiding losses and leakages in dams, canals and critical conduits.
Rehabilitated structures
6374
interventions on bridges, dams, tunnels and singular infrastructures in service.
International presence
17
strategic markets across Europe, Africa, the Americas and the Middle East.
Wind turbine foundations
+ 700
reinforcement, sealing and rehabilitation works on wind turbines.
Frequently asked questions about underground works
Stability depends on rock mass fragmentation, the presence of pressurised water, cavity geometry, crack evolution and the interaction between ground and lining. These factors require precise geotechnical diagnosis before intervention.
Natural caves are often located in protected or environmentally sensitive areas where preserving morphology, minimising visual impact and avoiding ecosystem alteration are essential. Non‑invasive techniques reinforce the rock mass without modifying the cavity.
Leakages cause lining deterioration, reinforcement corrosion, loss of load‑bearing capacity, void formation and functional impairment of the tunnel. In severe cases, they may compromise backfill stability and cause detachments.
HCC’s experience enables the application of specific, discreet solutions even in areas with difficult access, irregular geometries or high environmental sensitivity. This ensures safe, durable and environmentally compatible interventions.
Structural injections of high‑resistance resins, creation of self‑supporting crowns, sealing of active cracks and local reinforcement are used to stabilise the rock mass without altering cavity geometry.
Controlled injection techniques, leakage sealing, backfill reinforcement and procedures adapted to confined spaces are applied. High‑viscosity resins allow work even under pressurised water conditions without compromising stability.
HCC RESINS: advanced materials for complex interventions
We apply injection, sealing and structural reinforcement technologies to solve pathologies in critical infrastructures, ensuring durability and safety in every intervention.
