Basic Concept

The AT – Pipe Umbrella System is a pre-support measure used in weak ground conditions in conventional as well as mechanized Tunneling. Pipe umbrella pipes increase the stability in the working area by transferring loads in the longitudinal direction and decrease excavation induced deformations. The system increases safety in the working area. Besides this standard usage, the system is often applied to increase stability in portal sections and for the re-excavation of collapsed sections in Underground environments. Another application area is ground improvement and waterproofing in combination with all tunnel construction methods.