Application of
Tunnel Lining Support
EUROPEAN PILOT PROJECTS HAVE BEEN UNDERTAKEN WITH SFRC IN TUNNEL STRUCTURES
SFRC IN TUNNEL LINING SEGMENTS, AS AN ALTERNATIVE TO CONVENTIONAL RC SEGMENTS
The steel fiber reinforcement not only improves the toughness material, the impact and the fatigue resistance of concrete, but it also increases the material resistance to cracking and, hence to water and chloride ingress with significant improvement in durability of concrete structures. Therefore, the use of SFRC in tunnel structures represents an attractive technical solution with respect to the conventional steel reinforcement, because it reduces both the labor costs (e.g. due to the placement of the conventional steel bars) and the construction costs (e.g. forming and storage of classical reinforcement frames, risks of spalling during transportation and laying)
ADVANTAGES OF STEEL FIBER IN TUNNEL LINING
BENEFITS
Increase reinforcement effects with wall of even thickness on a rugged surface
Increase tensile strength, bending strength, shear strength of concrete; no hollowing-out ; reduction of wall thickness(20%)
High resistance to cracking; increase in toughness (residual strength) after cracking Shotcrete construction possible right after excavation; drop in risk of cave-in disasters; rise in reinforcement effects and safety of permanent structures
COST EFFECTIVENESS
Reduce labor costs, as no reinforcement assembly process is required Reduce working hours and construction costs
Reduce construction cost due to shortened construction period.
Reduce working hours and construction costs.
QUALITY
Streamlined work process; rise in quality and safety .
Reduce construction cost due to shortened construction period.
Reduce working hours and construction costs.
Reduce working hours and construction costs.
