Tunnels: Vienna Water Supply Line

Case study: SOFO System

Water Tunnel monitoring
Crack opening/shearing monitoring
Long-term measurement
Remote measurements

Project Description

Summary: Monitoring of crack openings in a 100 year old aqueduct. Sensors are installed in grooves and operate under water. Measurements every months and continuously when the pipe is emptied

Clients: Vienna Water Supply

Place: Vienna (Austria)

Period: 1999 - N/A

Installation: Riss

Structure's short description: The second Vienna water supply line was built in 1900. The tunnels are mad of concrete with a diameter of more than 2 m and a total length of about 170 km. A number of cracks have appeared in the some sections a long time ago and have been sealed with an appropriate treatment.

Aim of monitoring: The evolution of the opening and shear movement of some of the cracks should be monitored over the years and during the filling and emptying of the pipe. The data is used to plan additional repair interventions.

Number of sensor: 6

Main Results: The measurements show that the cracks tend to open slowly as the time passes. This small tendency overlaps with the larger deformations due to the filling of the pipe. Shearing effects are also observed.

Installing senosrs in grooves

Measruement results

Tunnel access point

Sensor layout

Bibliography:

Finite Element Structural Monitoring Concept , Glisic B., Inaudi D., The 2nd fib International Congress June 5-8, 2006, Naples, Italy, on conference CD, ID 17-18, 2006

Fibre Optic Methods for Structural Health Monitoring , Branko Glisic and Daniele Inaudi, Johh Wiley & Sons, Ltd, 2007