FRP Combination Bolt

FRP Combination Bolt

Innovative FRP solution for efficient tunnel excavation


ASTEC™ FRP Combination Bolt is a unique and innovative Glass Fiber Reinforced Polymer solution precisely designed by Dextra.

In unconsolidated excavation areas, like steel bolts, FRP Combination Bolt can be automatically installed by jumbo machine or manually installed.

Thanks to the characteristic of the FRP material, Combination Bolt can easily be cut by common excavation equipment, which makes the product an ideal solution for temporary application for tunnel excavation projects.

Technical data & BIM

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Product features

  • 2 in 1 system = Act as both anchor rod and grouting pipe.
  • Standard range available in 4 diameters ranging from 25mm to 38mm.
  • Can be delivered with GFRP (cut-able) or steel plate and nuts.
  • Additional high performance ASTEC model available in 32mm with body tensile loads ≥480 kN. Delivered with Domed Plate & Nut, making system suitable for installation on uneven surfaces.
  • Designed as per BS EN 1997-1; BS EN 1537 and BS 7861-1.
Hollow rod
Hollow rod
Acts as a grouting pipe to simplify installation process.
Cuttable system
Cuttable systems
By standard earth moving and mining equipment, including the plate/nuts accessories!
Light weight
Light weight
Easy handling, transportation and installation inside the tunnel.

Related Projects

Hyosung LPG Cavern

Hyosung LPG Cavern

Hyosung LPG Cavern includes LPG and petrochemical product production plants, storage tanks, and warehouses. For the construction of this project, Dextra GFRP rock-bolts were used.
Melbourne Metro

Melbourne Metro

This Melbourne Metro extension features a 9 km long tunnel and five new underground stations. Dextra Griptec, Astec Combination Bolts, Astec Soil Nails and Soft-Eyes were selected for the construction of this project.
Hatta Pumped Storage Hydro Power Plant

Hatta Pumped Storage Hydro Power Plant

The Hatta Pumped Storage Hydro Power Plant project will use water stored in an upper reservoir, utilizing pumped storage technology. Dextra was involved in the excavation of the hydro tunnels by supplying thousands of GEOTEC™ steel bolts.

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GEOTEC™ FRP Solid Rock Bolt

GEOTEC™ FRP Solid Rock Bolt

Solid rockbolt made of composite material. Recommended for face bolting.
Expandable Friction Bolt

Expandable Friction Bolt

Steel rock bolt solution expanded by high pressure water. Ideal for irregular bore holes.

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