Soft-eye FRP wall for easy penetration of TBM through retaining walls.
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 Bolts can be automatically installed by a jumbo machine or manually installed.
Thanks to the characteristics 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. Eurocode 2, BS 8110, DIN 1045, ACI 318, IBC, AASHTO, ASME Sec III Div 2.
Tunnel breakthrough made easy with FRP rebar
ASTEC Soft–Eyes allow the penetration of Tunnel Boring Machines (TBM) through डायाफ्राम की दीवारें and secant piles. This unique technology uses cuttable Glass Fiber Reinforced Polymer (जीएफआरपी) reinforcement as an advantageous replacement for conventional steel rebars. The Soft-Eye technology was 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 turnkey solution that includes design, optimization, manufacturing, logistics, and on-site training.
Immediate and permanent rock bolting solution
GEOTEC™ steel combination bolt is suitable for the most stringent requirements. A mechanical bolt combined with a corrugated pipe and a double grout layer all along the tendon to provide both high bonding and protection against corrosion (similar to Double Corrosion Protection / DCP).
It is initially installed for immediate support by the use of an expansion shell, to be fully grouted at a later stage allowing it to be classified as permanent application. bent reinforcement bars while being simpler and faster to install.
Cuttable mining anchor
GEOTEC™ FRP solid rock bolt is a rock-bolting system based on a fully threaded जीएफआरपी tendon.
It is specially designed for the following applications:
Face-bolting and temporary applications: The cutability of FRP makes it the ideal solution for face bolting or any other tunneling/mining application where further excavation is required.
Cohesive soil & hard rock. GEOTEC FRP is installed into pre-drilled holes.
Installation with grout or with resin cartridges.