Specialist Fastening Systems for Tunnel Infrastructure

Tunnel construction uses a range of specialist fastening systems and components depending on the tunnel design, segmental lining system and construction method. These can include dowel systems, bolting systems, shear bicones, guiding rod and grout and lifting components.

OPTI.Fix® is Optimas International’s specialist tunnel fastening product line, developed to improve efficiency, quality and safety in tunnel segment manufacturing.

The system is designed around the requirements of modern precast segment production and can support automated manufacturing processes. As part of our specialist tunnel product range, OPTI.Fix® provides a purpose-designed fastening solution for tunnel segment applications, helping manufacturers improve production consistency and streamline manufacturing operations.

Tunnel segment fastening systems are components used to connect, position, lift, grout or otherwise support precast concrete segments during tunnel construction. The appropriate system depends on the segment design, tunnel construction method and project requirements.

Grout-lift systems are specialist components used in tunnel segment manufacturing and construction processes where controlled lifting and grouting operations are required. The specific system depends on the segment design and project requirements.

Guiding rods can be used to help align and position tunnel segments during assembly and installation. Their design and specification depend on the segment geometry and requirements of the tunnelling system.

Shear bicones are specialist components designed to transfer shear forces between tunnel lining rings. Their specification depends on the structural and geometric requirements of the tunnel lining system.

Yes. Optimas International develops solutions designed to improve efficiency and consistency within tunnel segment manufacturing. OPTI.Fix®, for example, is designed to support improved production efficiency, quality and safety while offering compatibility with automated manufacturing processes.

Our specialist tunnel team provides engineering design support, product development, testing and validation. We can work with project specifications and customer requirements to develop components suited to specific tunnel segment designs and manufacturing processes.

Optimas International supports component quality through inspection and testing processes. Requirements are established according to the component, application and customer or project specification.

Yes. Optimas International’s specialist tunnel expertise supports tunnel projects internationally. We currently support more than 70 tunnel projects annually and have supplied components for more than 2,000 km of tunnel infrastructure worldwide over the past 20 years.

Early consideration of fastening systems can help ensure components are compatible with segment design, manufacturing processes and installation requirements. Engaging engineering and component specialists during the design and development stages can also identify opportunities to improve production efficiency and reduce project risks.