The system involves a series of linked rods, fixed to a tunnel wall to monitor deformation.

A datalogging system and related software is available to provide near real time displacement and generate a graphical representation of tunnel performance.

For monitoring:

Underground openings during construction for control and safety
Tunnel deformation due to nearby construction
Long-term deformation and performance of existing tunnels

Features:

• Low profile design with multiple arms to fit close to tunnel wall
• Does not interfere with tunnel traffic
• High system accuracy of up to 0.02mm of deformation
• Custom engineered to suit each individual application
• Immune to air density problems inherent in optical systems
• Direct measurement of displacement rather than calculation from tilt measurement