DYWIDAG Canopy Tubes Systems

Easy umbrella arch installation using modular tubes.

DYWIDAG Canopy Tubes for pipe umbrella systems are used as an inclined drilled roof pre-support measure for mechanical tunneling excavations. These systems ensure the stability of soil or rock formations, thus increasing workspace safety and ensuring the continuity of works.

The methodology uses arched and overlapping ground improvements provided by the specific characteristics of the canopy tubes. This modular system ensures that the desired length can be achieved quickly and easily. The color coding applied to each tube makes the sequential installation efficient and mistake-proof.

  • Standard lengths up to 18m are available, with additional lengths by request

  • Wide array of diameters of up to 168.3mm available, including the 114.3mm market standard

  • Particularly suited to poor ground conditions to ensure excavation continuity

  • Installation process is aligned to the tunneling cycling time

  • Easy installation: only a general drill jumble with suitable capacity required

  • Can be used for forepoling and grout injections

  • GFRP injection systems and long-distance drainage pipes also available


  • 4 types of connections: standard threaded, squeezed, pressed threaded and with nipple coupler

  • Pipe drill bits: from 2.0’’ to 6.0’’