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

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

Country 

Switzerland

Location 

Herisau/AR

Date 

2011

Duration 

2 Months

Case Study 

Tunnel wall and arch renovation with S&P ARMO-System (ARMO 2011_02)

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

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

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Region

S&P