The RST Profile Monitoring System for Tunnel Concrete Segments is a series of tilt meters, fixed to the tunnel wall on each of the precast concrete segments erected in place as tunnel lining by a Tunnel Boring Machine (TBM). The system is based on the assumption that each concrete segment is a rigid body and that the complete ring deforms by rotation of the individual segments one relative to the other, and the rotation points are the contact surfaces between adjacent segments
Range of ±15°
Resolution of ±2 arc sec. (±0.0006°) (0.01 mm/m).
Non-linearity of ±0.0125% F.S. (±0.002°) (0.03 mm/m).
Repeatability of ±0.0125% F.S. (±0.002°) (0.03 mm/m)
Sensor: MEMS (Micro-Electro-Mechanical Systems) Accelerometer, Digital Bus.
Monitor the convergence of precast concrete segments in TBM-driven tunnels during construction for control and safety.
Monitor tunnel deformation due to nearby construction activities.
Monitoring long term deformation and performance of existing tunnels.