Canopy/umbrella tubes (with diameters of 76-168mm) are a support system used in conventional and mechanical tunnel construction in poor soil conditions.

Canopy/umbrella tubes illustration

Common uses

Excavation support or water sealing during tunnel excavation


The drill rig and drill mast are positioned and drilling executed (using the symetrix method) with lost casing (Umbrella tube). Grouting with packer and cement grout is then used if requested.


Tubes rearrange loads to improve stability, reduce subsidence and increase work safety in the tunneling area
Tubes can be adapted to enable installation in confined spaces
Different types of pipe joints are available depending on project requirements