Ground Engineering - Tunneling & Mining - GEOTEC™ Lattice Girder

An immediate roof support for tunneling systems

GEOTEC™ lattice girder systems are lightweight, three-dimensional curved steel frames which are composed of main bars, secondary bars, connection plates, foot plates and stiffeners.

The lattice girder can provide immediate support for tunneling environments.

The radius of the bending is tailor-made to meet each project’s demands.

• Two types of design: 3-bar or 4-bar, for different force requirements.
• Flexible design with different dimensions available.
• Entirely integrated in the shotcrete lining.
• Avoid porous zones and shotcrete spray shadows.

Immediate support : in the area of the tunnel face

Simple and fast : installation without the need of major equipment

Engineering support : from Dextra professionals

Cut-able support is mostly used in the longitudinal direction of the tunnel (portal, face) when temporary stabilization is required before moving to the next phase. Also, Mechanized Tunneling is becoming standard in urban areas, especially for underground metro projects. This modern technique is calling for new kind of systems, in particular cut-able reinforcement bars for concrete structures (like Soft-Eyes in D-walls) and cut-able ground anchors.

When building a tunnel by drill & blast or conventional mining, the roof and walls need to be supported. Rock-bolts are the first type of support installed, before any other kind of mesh or lining is applied. Depending on the construction sequence and technology, both temporary and permanent bolts can be offered.

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