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Rehabilitation of wastewater pipe interior - Uetlibergstrasse - Zürich, Switzerland

Static retrofitting (wet-spray method) for structural enhancement

Country 

Switzerland

Location 

Zürich/ZH

Date 

2014

Duration 

6 Months

Case Study 

Rehabilitation of wastewater pipe interior with S&P ARMO-crete w RQ (2014_02)

Situation 

The city of Zurich has an extensive walkable wastewater pipe system, which is to be rehabilitated step-by-step over the coming years. The approx. 100-year-old pipe on Uetliberg street is egg-profiled (1000/1500 mm), made of in-situ concrete, and about 350 m long.

Solution 

In stages, about 3 cm is grinded off the concrete pipe interior walls using high-pressure water jets. Next, the channel bottom is refurbished with a Kera-Line ceramic plate while the remaining surfaces are reprofiled by wet-spraying abrasion-resistant mortar S&P ARMO-crete w RQ onto the old concrete profile. Positioning the S&P ARMO Power Pump directly at the S&P silo prevents dust-related nuisances in the urban environment.

Material 

approx. 250 tons of S&P ARMO-crete w RQ

Pipe interior (concrete substrate) after a layer of concrete has been ground off

Completed reprofiling with S&P ARMO-crete w RQ

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