Innovative FRP solution for efficient tunnel excavation
ASTEC™ FRP Combination Bolt is a unique and innovative Glass Fibre 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.
Product features
- Recommended for borehole diameter 43-45mm.
- FRP profiles are twice as strong as steel in tensile strength, for only 25% of its weight.
- Tensile strength up to 1,000 Mpa.
- Thanks to its metric metal nut, the number of rotations is similar as steel bolts. During the installation, the operator will not notice any difference when pre-tensioning the bolt.
- Clearance inside the tunnel is maximized due to its short tail length. This also limits the concrete lining thickness if the head have to be embedded.
- Compatible with automatic grouting process.
Corrosion free
Resistant to both acidic and alkali
environments.
Cuttable systems
Can be easily cut by common
excavation equipment.
Light weight
Easy handling, transportation and
installation inside the tunnel.
Related Projects
Related solutions
Soil Retention: Post-tensioned hybrid FRP+Steel cut-able ground anchor system used in excavation works.
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.
Expertise
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.