Challenges

• Reducing dust exposure during the application of dry shotcrete in continuous tunneling
• Small cross-section of the tunnel
• Mechanized tunneling using a tunnel boring machine

Approach

• Wet shotcrete technology with high flexibility due to constant availability of building material
• Custom-made pressure vessel with minimal dust generation during mechanical tunneling with dry shotcrete
• Transport of the pressure vessels on the train elements with quick-installation capability

Products supplied

• Dry mix for the production of wet shotcrete C 25\30, grain size 0–8 mm
• Dry shotcrete C 25\30, J2, grain size 0–8 mm

Techniques used

• Buffer silo, 100 m³ _~ 160 t
• Buffer silo, 29 m³ _~ 46 t
• RG JUMIX^® Self-Contained Mobile Mixing Unit (patent-pending)
• Horizontal pressure vessel on Multi Service Vehicle (MSV)