Why Designers and Contractors Choose Dextra for Metro Projects

As cities grow denser and urban mobility becomes more critical, underground metro networks are transforming the way people move. These massive infrastructure projects demand not only engineering precision but also dependable partners who bring a proven track record, technical excellence, and certified quality. Dextra Group is one such partner—trusted globally by designers, contractors, and fabricators for complex underground works and more than 20,000 mega projects across the world.

With a legacy of delivering innovative construction solutions since 1983, Dextra has established itself as a global leader in reinforced concrete technologies and engineered systems.

Our involvement in some of the world’s most demanding metro projects demonstrates the depth of our technical expertise and our ability to tailor solutions to each stage of construction.

Tailored Solutions for Every Metro Challenge
In metro construction, each section presents unique technical challenges. Dextra provides a complete portfolio of solutions optimized for safety, speed, and reliability across the entire project lifecycle.

Coupler Systems for Reinforcement Continuity
Rebar continuity can be essential in high-load zones of metro stations and tunnels. Dextra offers a full range of mechanical splicing systems—including Bartec, Rolltec, and Griptec—used to connect rebars in columns, shear walls, rafts, slabs, and diaphragm walls.

Application: Structural connections in station boxes, tunnel segments, and base slabs
Why Dextra:

• Proven bar-break performance for maximum structural integrity.
• Backed by the industry’s most comprehensive local and international certifications.
• Trusted solution with a proven track record across more than 20,000 global projects.

Soil Stabilization with GFRP Rock Bolts and Anchors
Excavation and tunnel face support often require temporary yet high-performance reinforcements. Dextra’s GFRP rock bolts and anchors are ideal for soil stabilization in metro shafts and cut-and-cover excavations. Lightweight, non-corrosive, and easy to handle, these solutions offer excellent bond strength and can be safely cut during tunnel boring machine (TBM) breakthroughs.
GFRP tie-backs such as Astec Active Anchor can be used in replacement of traditional solutions – steel struts and anchor. They support the shoring walls of the station without encroaching into the neighboring plots nor obstruction the excavation work.

Application: Tie-backs, tunnel face retention, shaft excavation

Why Dextra:

• Custom-engineered solutions tailored to each project’s unique requirements.
• Efficient delivery and streamlined logistics management.
• In-house GFRP manufacturing guarantees consistent performance and reliability.

Soft-Eye Systems for TBM Penetration

To facilitate TBM breakthrough without damaging reinforcement, Dextra supplies custom-designed GFRP soft-eyes, an essential component in diaphragm walls and launch shafts.

Application: Tunnel boring machine access zones

Why Dextra:

• Trusted design expertise backed by decades of proven engineering.
• Integrated in-house manufacturing and logistics for full quality and delivery control.
• Industry pioneer of the Soft-Eye solution, innovating since 1983.

GFRP for TBM precast segments

The lining of TBM tunnels is made of precast concrete segments that are subject to very high loads – especially during installation – and high corrosion from water seeping through the ground. GFRP rebars, strategically located in the perimeter of fiber-reinforced concrete (FRC) segments offer competitive, durable and sustainable hybrid design for metro tunnels.

Application: Precast concrete segments of Tunnel Boring Machine (TBM) tunnels

Why Dextra:

• Collaboration with Fibre-Reinforced Concrete players.
• Technical and design support from Dextra experts.

Precast Connections for Modular Metro Construction

For projects leveraging precast segmental construction, Dextra’s engineered bar systems offer a fast and durable connection solution. From couplers to tension bars, our systems improve site productivity while maintaining design flexibility.

Application: Precast tunnel linings, station elements, and utility structures

Why Dextra:

• Easy and fast installation to accelerate construction timelines.
• Optimized alignment tolerance for easier and more flexible assembly.
• Engineered for superior fatigue resistance in demanding applications.

Post-Tensioning Bars for Above-Ground Metro Infrastructure
Elevated metro lines demand reliable, adaptable tensioning solutions-whether for temporary works or permanent applications.

Dextra’s high-strength post-tensioning bars are used in critical applications ranging from launching gantries and span-by-span erection to permanent load transfer in pier caps and segmental or cast in situ decks.

Application: Viaducts, pier caps, segment stitching, launching systems, falsework, and permanent post-tensioned connections

Why Dextra:

• High-strength steel engineered for dependable elongation and ductility.
• Versatile installation and anchoring options adaptable to all site conditions.
• Proven durability for both temporary applications and long-term structural use.

Global Projects that Speak for Themselves
Dextra’s underground solutions have been deployed in dozens of metro networks across the globe, reinforcing our role as a trusted infrastructure partner. Some highlights include:

• Grand Paris Express, France – Extensive supply of GFRP soft-eyes and mechanical couplers for one of Europe’s most ambitious metro expansions.
• Doha Metro, Qatar – Complete portfolio used from diaphragm wall connections to soil anchors.
• Dubai Metro, UAE-Full reinforcement and soft-eye systems supporting the region’s transit modernization.
• Melbourne Metro, Australia – GFRP and mechanical splicing solutions meeting strict local standards.
• Bangkok and Delhi Metros – Long-term partnerships and local support hubs enable timely delivery and engineering assistance.

Dextra India Private Limited
Email : psaha@dextragroup.com
Web : www.dextragroup.com