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FRP Hollow Rock Bolt

FRP Hollow Rock Bolt

Cuttable rod and grouting pipe in one!

GEOTEC FRP Hollow Rock Bolt is a rock-bolting system based on fully threaded hollow GFRP bars.
It is especially designed for the following applications:

  • Face-bolting and temporary applications : Cut-ability of FRP makes it the ideal solutions for face bolting or any other tunneling/mining application where further excavation is required.
  • Cohesive Soil & Hard Rock conditions. GEOTEC are inserted into pre-drilled hole. For non-cohesive soil environment, refer instead to FRP Self-Drilling Bolts.
  • Installation with grout. The hollow GFRP anchor rod also acts as a grouting pipe to ease installation.

Product features

Hollow rod

Acts as a grouting pipe to simplify
installation process.

Cuttable systems

By standard earth moving and
mining equipment, including the
plate/nuts accessories!

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.

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.

Melbourne Metro: five new underground stations

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.

Related solutions

Specific tunneling application of GFRP rebar cage allowing a TBM to break through a reinforcement cage in a minimum time.

Soil Stabilization: Fully cut-able FRP soil nail system used for the stabilization of slope.

Soil Retention: Post-tensioned steel ground anchor system used in excavation works.


At every moment of your customer journey, Dextra teams dedicate themselves to the production of smart construction solutions that allow our customers to reach higher productivity and safety levels on their construction sites.

Dextra holds physical stocks on several continents, complemented in each country by the local inventories of our distributors. With this extended network, Dextra makes sure our products are always at reach no matter where our partners are.

For solutions that require to be customized, Dextra can also go beyond our standard delivery times and offer accelerated delivery schemes. Consult us for more information.

From 3 major industrial sites located in Bangkok (Thailand), Guangzhou (China), and Pune (India), Dextra completely owns its manufacturing facilities and processes. This allows us to have complete control over the timing of our operations and the quality of the solutions produced.

An independently accredited material testing laboratory, accredited to ISO-IEC17025, is located at Dextra’s main Bangkok factory, allowing the testing of material and products.

Dextra aims to supply products that exceed the most demanding international technical approvals and it is our goal to create maximum customer satisfaction by complying with our clients’ needs and specified requirements.

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