ASTEC™ Soft-Eyes


Tunnelling breakthrough made easy with FRP rebar

ASTEC Soft–Eyes allow the penetration of Tunnel Boring Machines (TBM) through diaphragm walls and secant piles. This unique technology uses cut-able Glass Fiber Reinforced Polymer (GFRP) reinforcement as an advantageous replacement for conventional steel rebars.

The Soft-Eye technology has been developed by Dextra in 1996 and successfully implemented for the first time on Bangkok MRT subway stations. The Soft-Eye technology has since become a standard concept in the design of launching/receiving shafts and subway stations. We have successfully supplied over 500 Soft-eyes on all continents.

Dextra offers an integrated turn-key solution which includes design, optimization, manufacturing, logistic and on-site training. 


Where and why using Soft-Eyes?

  • In each D-Wall or Pile where a TBM will go through, typically in launching/retrieval shafts or subway stations.
  • Although designed as a temporary solution, a Soft-Eye can stay in the ground up to 100 years!
  • Thanks to the cut-able nature of GFRP bars. TBMs can get in/out of shafts/stations in a few minutes.
  • With Soft-Eyes, forget about the tedious and unsafe task of removing steel reinforcement. No risk either of damage for the TBM’s head .
  • Dextra Soft-Eyes follows ACI construction guidelines. Our solution is backed up by world’s major consulting firms.


Design to breakthrough
Design to breakthrough
Dextra follows and assist you through every step of the way.
Let TBM go through in minutes while avoiding any damage.
Tunneling delayed? Dextra Soft-Eyes can stay in the ground up to 100 years!

Turnkey solution by Dextra

  • Dextra delivers a full solution: design, optimization, manufacturing, logistic and on-site training of your teams.
  • Suitable for all ground conditions and adaptable to D-Walls and circular piles.
  • Various customized shapes (straight, C-shape, loop) and grades (elastic modulus 45 GPa and 50 GPa) available.
  • Splicing systems also available if required.
  • Accelerated delivery schemes available for the most urgent projects.
  • Wherever soil forces require it, Soft-Eyes can also be combined with ASTEC Active Anchors, which are also fully cut-able.

See it in action!


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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