AT - Pipe Umbrella Support System

Field of application AT - Pipe Umbrella Support System

• Tunneling in heterogeneous, soft, or subsidence-sensitive ground
• Tunneling through fault zones
• Unstable ground conditions at the working area
• Shallow tunnels in urban areas

AT - Pipe Umbrella Support System - mode of action

• Support of the tunnel wall in the region of the face
• Distribution of loads in the longitudinal direction
• Ground improvement ahead of the tunnel face by grouting
• Reduction of subsidence due to ground improvement and load distribution
• Drainage and ground support also by non-injected casing tubes

Standard structural properties AT - Pipe Umbrella Support System

• AT - 76: 76,1 x 5,6
• AT - 89: 88,9 x 6,3
• AT - 114: 114,3 x 6,3
• AT - 139: 139,7 x 8,0 bzw. 142,0 x 10,0
• AT - 168: 168,0 x 12,5

Depending on project requirements and customer demands, the AT - Casing System can be adjusted by changing the structural properties.

Optionally, the AT - Pipe Umbrella Support System is also available in combination with a particular pipe connection.
This so-called "threaded nipple coupling" enables the extension of pipes without reducing the pipe’s strength in the section of the threads. Thereby, the total and constant load-bearing capacity of the casing pipes is warranted over the entire length of the pipe umbrella.

AT - Casing System

Casing tube Single-use drill bit Impact shoe Impact ring Adapter with flushing valve

Injection Equipment

AT - RIA Rotary-Injection-Adapter	AT - Flow-Pressure Meter	AT - Mortar-Mixing pumps: M400 EASY / M400 NT
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