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.

 

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
Corrosion free
Resistant to both acidic and alkali environments.
Cuttable systems
Cuttable systems
Can be easily cut by common excavation equipment.
Light weight
Light weight
Easy handling, transportation and installation inside the tunnel.

Engineering

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

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Network & Services

Network - Dextra holds physical stocks on several continents, complemented in each country by the local inventories of our distributors. With this extended network, Dextra make sure our products are always at reach and available in reasonable times.

Delivery - For solutions which required to be customized for each project, Dextra can also go beyond our standard delivery times and offer accelerated delivery schemes. Consult us for more information.

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Manufacturing capabilities

From 3 major industrial sites located in Bangkok (Thailand), Guangzhou (China) and Mumbai (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.

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Testing facility

An independently accredited material testing laboratory, accredited to ISO-IEC 17025, is located at Dextra’s main Bangkok factory, allowing the testing of material and products.

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Quality & Certifications

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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