TUNNEL PRE-SUPPORT UMBRELLA
Pipe Roofing Umbrella Forepoling System
Complete tunnel umbrella arch pre-support system engineered to stabilize tunnel portals, fault zones, and low-overburden railway crossings before excavation.
Application
Tunnel Crown Pre-Excavation Support
Steel Grade
S355 Structural Steel (Yield ≥ 355 MPa)
Casing Sizes
Ø76mm to Ø168mm OD
Thread
Flush External/Internal Joint
ENGINEERING METRICS
TECHNICAL DATA & SPECIFICATIONS
System Name
Pipe Roofing Umbrella Arch Forepoling System
Steel Grades
S355 / DIN St 52-3 Seamless & Welded Steel
Casing OD Range
Ø76.1mm, Ø88.9mm, Ø114.3mm, Ø139.7mm, Ø168.3mm
Wall Thickness
4.5mm to 10.0mm heavy gauge
Connection Type
Trapezoidal Male/Female Flush Threaded Couplings
Length per Segment
1.5m, 2.0m, 3.0m, 6.0m threaded pipes