Projects

Tunnel wall and arch renovation - Tal-Tunnel - Herisau, Switzerland

Static retrofitting (dry-spray method) used in tunneling and general construction

Tunnel wall and arch renovation - Tal-Tunnel - Herisau, Switzerland

Topic 
Tunnel wall and arch renovation
Object 
Tal-Tunnel
City 
Herisau
State 
Aargau
Country 
Switzerland
Date 
2011
Duration 
2 Months

Situation

Due to long-term strain on the construction, the Tal tunnel was in need of renovation. In the process, the tunnel walls and arched ceiling were simultaneously renovated and reinforced with the S&P ARMO system. This was the most economical solution that would satisfy the requirements regarding the clearance gauge of modern rolling stock.

Solution

The concrete substrate was cleaned and in damaged places grinded down using high pressure water jets. The first layer of ARMO-crete d with a thickness of 4 cm was then applied. In the next work stage, the S&P ARMO-mesh 200/200 was fixed onto the shotcrete using rust-free staples and a pneumatic staple gun. The reinforcement mesh was finally covered with another 4 cm-thick layer of S&P ARMO-crete d.

Materials and methods were inspected closely through various tests on the structure itself and in the laboratory.

Material

approx. 200 tons of S&P ARMO-crete d and 1600 m2 S&P ARMO–mesh 200/200

Image Gallery

  • Applying the first layer of ARMO-crete d

  • Mounting the ARMO-mesh 200/200 onto the shotcrete

  • Tunnel after the completion of the renovation and reinforcement measures

Service

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