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Umbrella Pipe

A pre-support system for weak grounds

GEOTEC™ umbrella pipe system is a pre-support in soft and weak ground conditions. The system comprises of steel pipes installed from the tunnel face to form a roof to stabilize the tunnel headings. By distributing the load in longitudinal direction, it can decrease deformation during excavations.
The supporting mechanism of the umbrella pipe method is to stabilize the excavation face in both the transverse and longitudinal directions by an arch-like reinforced zone.
The support system can be divided into three different aspects:

  • Radial support
  • Longitudinal support
  • Subdivision of open areas of the unsupported zone

Product features

Immediate support

in the area of the tunnel face

Simple and fast

installation without the need of
major equipment

Maximized safety

and extended possibilities

Related Projects

Anderson Road Quarry - Underpass

Anderson Road Quarry

The Anderson Road Underpass is part of a larger land rehabilitation project taking place at the Anderson Road Quarry. The vast land of the quarry, located North East of Kowloon, will ultimatelly be used to house as many as 25,000 people over a 12 hectars area.

Hatta Pumped Storage Hydro Power Plant

Hatta Pumped Storage Hydro Power Plant

The Hatta Pumped Storage Hydro Power Plant project will use water stored in an upper reservoir, utilizing pumped storage technology. Dextra was involved in the excavation of the hydro tunnels by supplying thousands of GEOTEC™ steel bolts.

Melbourne Metro: five new underground stations

Melbourne Metro

This Melbourne Metro extension features a 9 km long tunnel and five new underground stations. Dextra Griptec, Astec Combination Bolts, Astec Soil Nails and Soft-Eyes were selected for the construction of this project.

Related solutions

Specific tunneling application of GFRP rebar cage allowing a TBM to break through a reinforcement cage in a minimum time.

Soil Stabilization: Fully cut-able FRP soil nail system used for the stabilization of slope.

Soil Retention: Post-tensioned steel ground anchor system used in excavation works.


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

Dextra holds physical stocks on several continents, complemented in each country by the local inventories of our distributors. With this extended network, Dextra makes sure our products are always at reach no matter where our partners are.

For solutions that require to be customized, Dextra can also go beyond our standard delivery times and offer accelerated delivery schemes. Consult us for more information.

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

An independently accredited material testing laboratory, accredited to ISO-IEC17025, is located at Dextra’s main Bangkok factory, allowing the testing of material and products.

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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