The Bassett convergence system is used to monitor transit tunnels for potential damage from nearby construction activities.
The BCS monitors movement of reference points that are mounted on the tunnel lining. The points are aligned to a plane that is normal to the axis of the tunnel.
Tilt readings are recorded by a data logger and retrieved at scheduled intervals by a remote computer. The readings are then processed by BCSWin software and the resulting displacement data are displayed in graphic or tabular form. A BCSWin screen shot is shown below in reduced size.
The system can operate in near-real time. A complete set of tilt readings can be recorded in about five seconds, and the remote computer can update the graphic display in just a few seconds more.
Low Profile Design: The BCS is designed specifically for tunnels. The system fits close to the tunnel wall and does not interfere with normal traffic. Arms can be shaped to provide extra clearance or to bypass obstructions.
For more information please refer to datasheet.