NTET manufactures GFRP fiberglass consolidation tubes for geotechnical applications in tunnels. The geotechnical pipe with improved bond (code T0PO0166) is designed for the temporary and/or permanent stabilization of the excavation face, crown and side walls.
The helical groove (5 mm wide, 1.5 mm deep, 20 mm pitch) improves adhesion with the cementitious mix and allows jointing by means of external galvanized steel couplings.
Disponibile nella versione standard e con sistema di valvolatura per l'iniezione di miscele cementizie.
Tube with improved bond and helical groove. External diameter 60 mm, internal diameter 40 mm. For the consolidation of excavation faces and tunnel crowns.
| Parameter | Value | Unit |
|---|---|---|
| External diameter | 60 | mm |
| External diameter | 40 | mm |
| Groove width | 5 | mm |
| Groove depth | 1,5 | mm |
| Groove pitch | 20 | mm |
| Tensile strength | ≥ 800 | MPa |
| Shear strength | ≥ 120 | MPa |
| Density | ~ 1,9 | g/cm³ |
| Glass fibres | ~ 60 | % |
Version with valving system for the injection of cementitious mixes. Available with elastic sleeve valve (V) or button valve (B), 10 mm holes.
| Parameter | Value | Unit |
|---|---|---|
| External diameter | 60 | mm |
| External diameter | 40 | mm |
| Valve hole diameter | 10 | mm |
| Valve spacing | 50 | cm |
| Valve spacing | Elastic sleeve (V) / Button (B) | |
| Tensile strength | ≥ 800 | MPa |
| Shear strength | ≥ 120 | MPa |
Glass fibre reinforced polyester resin (GFRP): unsaturated polyester resin, glass filament fibres and mat fibres.
Values refer to tests carried out in the preferred fibre direction.
Available on request in two types:
Ø 10 mm holes, 50 cm spacing (modifiable). For the injection of cementitious mixes.
Galvanized steel coupling sleeve (code N5PO0007) for connecting VTR 60/40 pipe segments.
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Designed for consolidation works in underground infrastructure projects.
Excavation face stabilizationTemporary and permanent consolidation of the excavation face in unstable ground.
Structural reinforcement of tunnel crowns and side walls under construction or maintenance.
Structural reinforcement of tunnel crowns and side walls in tunnels under construction or maintenance.
With the valving system (V or B), it allows controlled injection of cementitious mixes for permanent ground consolidation.
Elastic valve (V): rubber sleeve that deforms under pressure to allow injection and closes again automatically. Button valve (B): pressure-fit rubber cap, removable at the time of injection. Both cover Ø 10 mm holes.
Length is customizable on request. The segments are joined with the galvanized steel coupling sleeve (code N5PO0007).
Yes. GFRP pipes are easily demolishable with TBM cutters and excavators, unlike steel bars: a key advantage for the consolidation of excavation faces that must later be excavated.
Density: UNI 7092 — Tensile strength: UNI 5819 / UNI EN 61 — Shear strength: ASTM D 732.
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