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
