Finch West Light Rail Transit – Line 6 Construction
The project team was tasked with the installation and monitoring of 1,200+ monitoring points across the length of an 11-km light rail transit alignment, and the 18 associated stations. The project transits a well-developed urban setting and is scheduled to be phased over a 4-year project period, starting in late 2019. Instrumentation is varied and includes surface-mounted monitoring systems on active roadways and structures and below-grade systems in active subway tunnels. The challenges of monitoring on the project are complicated by limited access to installation points, changing site conditions, an evolving instrumentation plan, and a large and diverse user base requiring access to an extensive sensor database estimated to manage millions of data points and measurements over the construction phase of monitoring. Additionally, the solution requirements included pairing various sensor technologies with a single monitoring platform while striking a balance of financial stewardship backed by reliability.
To meet the many challenges of the Finch West LRT project, GKM worked with sensemetrics to develop a dynamic monitoring solution that consists of a cost effective and easy-to-deploy wireless system comprised of Loadsensing wireless nodes to automate a wide range of vibrating-wire geotechnical sensors, as well as sensemetrics Thread devices to automate more complex sensors such as Measurand ShapeArrays and Leica Automated Motorized Total Stations (AMTS). Both automation devices stream sensor data to sensemetrics’ platform for real-time access to sensor measurements on an evolving reading frequency to meet project requirements. Areas that require less frequent reading intervals are captured manually using various data collection methods (water level sounder/readout, manual inclinometer probe, or manual survey targets) and are also uploaded into sensemetrics’ platform. Lastly, the selection of sensemetrics was based on the flexibility and scalability to meet the dynamic project requirements commonly associated with large LRT projects.
This included support for the following sensor technologies:
Automated Vibrating Wire Technology
• Multi-Point Borehole Extensometers (MPBX)
• Strain Gauges
• Pressure Cells
Automated MEMS Technology
• Electrical Biaxial Tiltmeters
• Electrolevels & Tilt Beams
• In-Place Inclinometers
• Track Monitoring System
• Survey Prisms
• Manual Levelling Points
• Standpipe Water Levels
Automated GeoSpatial Measurements
• Automated Motorized Total Station (AMTS)
Additional productivity enhancing tools that were implemented include sensemetrics’ Reporting and Documents modules. Reporting auto-generates and delivers formatted PDF reports to key stakeholders on a customizable schedule or in response to threshold exceedances. Documents provides a secure and cloud accessible document share that uniquely associates photo documentation, reports, and other documents with project assets – providing a comprehensive shared resource for unification of project instrumentation records.
Location: Toronto, Canada
Owner: Metrolinx | operated by Toronto Transit Commission
Engineering: Mosaic Transit Group
Instrumentation: AIM, GKM Consultants
Project Type: Subsidence Monitoring, Railway Deformation, Structural Stability