DYWIDAG Lattice Girders

The industry standard modular system for erecting tunnel walls and roofs.

DYWIDAG Lattice Girders are used as immediate passive support systems in tunneling construction. They provide the same mechanical characteristics as traditional H-beam profiles while mitigating their downsides.

The girders are made of high-strength round bars. Compared to conventional H-beam profiles, they weigh much less while offering the same loading capacity, making the installation and handling work faster and easier.

DYWIDAG Lattice Girders allow shotcrete lining to be combined with steel profiles into a uniform RC structure, generating the fastest bearing capacity gains and improving water-tightness for the whole structure. 

  • High-strength round bar for higher load-bearing capabilities than H-beam profiles

  • Easy and quick assembly thanks to simple handling

  • Simple adjustment and shaping to the excavation geometry

  • Available in a 3- or 4-bar design – Spider (3) or Butterfly(4) stiffening connectors or Cage(4) – for a range of applications

  • Can be used as a true-to-form template for shotcrete application

  • Optimum bond and interconnection with the shotcrete lining

  • Ideal bearing for spiles and lagging boards

  • Spiles may be installed both above or through the lattice girders for ease of installation