Steel Combination Bolt

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

  • The umbrella pipe system contains 2 parts: external pipe casing and rods.
  • The external pipe casings are composed by: drill bits, casing pipes, front pipe, extension pipes and end pipe.
  • The rods are connected by: pilot device, drill rods, sleeves, drill rods, adapters etc.
  • Length of system and components can be adapted to space



Immediate support
Immediate support
for the excavation tunnels
Simple and fast
Simple and fast
self-drilling installation
Maximized safety
Maximized safety
and extended possibilities


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.

Learn more

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.

Learn more

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.

Learn more

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.

Learn more

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.

Learn more

Don't have an account yet? Register Now!
Equipment Spare Part Manual Log in

Sign in to your account