INFRASTRUCTURE SOLUTION

GFRP for Metro, Tunnels & TBM Soft-Eyes

Composite reinforcement for selected underground works where cuttability or non-metallic behaviour creates an execution advantage.

Where GFRP can add value

TBM soft-eyes • Launch and reception shafts • Diaphragm wall zones • Secant pile zones

ENGINEERING NOTE

Every tunnel application requires review of structural design, fire, temperature, cover, resin properties and project approval.

IN PRACTICE

The cuttable reinforcement TBMs prefer

GFRP is the global standard for TBM soft-eyes: strong enough to retain the shaft, soft enough for the cutterhead to bore straight through. No steel cutting, no stoppage, no cutter damage.

In permanent works, GFRP solves stray-current corrosion — the chronic failure mode of electrified rail infrastructure — because it is completely dielectric.

Where it’s used

TBM soft-eyes

Machine bores directly through the wall

Launch & reception shafts

Temporary works with fast breakout

Diaphragm wall panels

Cuttable panels at tunnel interfaces

Track slabs & signalling zones

Dielectric — no stray-current corrosion

100%

TBM-cuttable — no manual breakout

Days

saved per shaft breakthrough

Zero

stray-current corrosion risk

Discuss this application with JRD →

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