Ground Engineering - Tunneling & Mining - GEOTEC™ 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

• 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 : for the excavation tunnels

Simple and fast : self-drilling installation

Maximized safety : and extended possibilities

Cut-able support is mostly used in the longitudinal direction of the tunnel (portal, face) when temporary stabilization is required before moving to the next phase. Also, Mechanized Tunneling is becoming standard in urban areas, especially for underground metro projects. This modern technique is calling for new kind of systems, in particular cut-able reinforcement bars for concrete structures (like Soft-Eyes in D-walls) and cut-able ground anchors.

When building a tunnel by drill & blast or conventional mining, the roof and walls need to be supported. Rock-bolts are the first type of support installed, before any other kind of mesh or lining is applied. Depending on the construction sequence and technology, both temporary and permanent bolts can be offered.

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