Umbrella System

The Umbrella System serves as a pre-support measure, providing reliable support in tunnel drives, portal areas, and re-excavation of collapsed sections under weak ground conditions in both conventional and mechanized tunneling.

Description

Pilot bit thread: R32, T38, T45

Outer diameter of steel casing: 76.1mm, 88.9mm, 101.6mm, 114.3mm, 139.7mm

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