Tunnel Dowel System

Sofrasar Tunnel Solutions

Supporting tunnel infrastructure teams with industry knowledge, technical expertise and fastening solutions for over 25 years.

Our team are experts in understanding project-specific needs for any tunnel solutions.

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ENGINEERING DESIGN SUPPORT

Make the best tunnel fastener decisions with expert design assistance, finite elements analysis and project-specific technical support.

Optimas Sofrasar Tunnel Box With Nut Bolt Going In

RESPONSIVE AND EFFICIENT SHIPPING

Get the right solutions delivered at the right time to meet the specialised needs of your tunnel construction project—anywhere across the globe.

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QUALITY
CONTROL

Know you have the highest quality parts as a result of our rigorous standards, zero defect culture, leading certifications and registrations.

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VALIDATION AND TESTING

Confirm the mechanical resistance of each system before you implement it through our full range of testing tools available at our laboratories.

Optimas Sofrasar Tunnel Solutions Fasteners Fixings

BOLTING SYSTEMS

Bolting systems are used for the assembly of concrete segments, rail fixings and belt conveyors. Our range of systems can support tensile stress from 70 to 400 kN. Metallic inserts are made out of stainless steel, either 316L or a different grade. We offer various steel grade bolt options including ASTM A325 and 10.9, as well as zinc coated, hot dip galvanized or plastic coated.

DOWEL SYSTEMS

Fixating the rings through thermoplastic dowels enables a quick and secure installation in tight global tolerances, while providing stability of the rings as a result of ground or grout injection pressure.

CENTERING SYSTEMS AND SHEAR DOWELS

Centering systems and shear dowels speed up and simplify installation of concrete segments and enable optimum control of the shearing stress up to 500 kN. We offer a large range of dimensions and thermoplastic qualities to source the most appropriate deflection curves for your application.

GROUT-LIFT SOCKETS

A large range of grout and lift-sockets provide a tightness cap up to 40 bars and a breaking tensile stress up to 600 kN.

GUIDING RODS AND PACKERS

These simple and cost-effective products control the position between the concrete segments, providing a good shear resistance and full control of tight tolerances and slip hazards.

PRECAST ACCESSORIES AND SECURITY SYSTEMS

Our wide range of systems include:

  • Plastic and metallic inserts for the installation of electrical equipment
  • Fire protection products
  • RFID-based product traceability
  • Geothermal energy in tunneling

FINITE ELEMENTS ANALYSIS

With a large range of grout and lift-sockets, we can assist you in the design stage by undertaking finite elements analysis at our laboratories, using specialised testing and software.

RELATED LINKS

Explore our Tunnel Solutions

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How to Find the Optimal Fixing Design to Meet All Tunnel Project Requirements

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Your Tunnel is Not Like Anyone Else’s.  Why Should Fixing Your Components Be?

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Take The Optimum Approach to Tunnelling with Optimas Sofrasar Tunnel Products

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In the beginning we were quite skeptical about working with dowels in circumferential joints. However, after the success in the Crossrail project, plastic dowels have become an alternative to the classic bolt system for our contractors.

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