ECLRT Tunnel Surveying

Tunnel surveying | ECLRT Project

Monteith & Sutherland have been proud partners of Metrolinx, and provide high precision survey services in challenging conditions. In this particular project – performing differential levelling, total station traverses, gyroscopic verification surveys, and High Definition Laser Scanning for our client.

ECLRT Deformation Monitoring

On the Eglinton Crosstown Light Rail Transit project we perform precise deformation monitoring, where we survey surface and building settlement points. There are approximately 4250 settlement instruments to be observed over the course of the project, with 6 survey crews working together to complete daily monitoring tasks where there is active construction. One of the most challenging aspects of this monitoring project is measuring above the Tunnel Boring Machines at night and combating poor lighting and glare from car headlights. See below for a glimpse at the process: