Place D'Orleans Bridge

The pedestrian bridge provides multi-user pathway access from the O-Train East Extension station to the Place d’Orleans Shopping Centre. The bridge is enclosed and climate-controlled. This project is part of the broader Confederation Line Stage 2 project (OLRT extension), which expands Ottawa's light rail network to the East. As part of the OLRT extension, pedestrian bridges have been installed at various locations, such as Green’s Creek, Trim, and Baseline Station. These bridges enhance connectivity to the future OLRT stations. The bridge has two equal simple spans of 42m long Algonquin steel trusses that feature a 5.1m wide truss supporting a 4m clear multi-user pathway. Spannovation performed the assembly and erection engineering of the 84m bridge on behalf of the erector, ES Fox.

Steel Erected: Two truss spans weighing 108MT were assembled and erected.

Erection Methodology: Each truss was stick-built on temporary dunnage supports adjacent to their spans using a Grove TMS 9000E crane and a Broderson crane. Eight temporary supports were set to specific elevations to facilitate the assembly of two truss halves before splicing, and to account for truss pre-camber. Once connected, each full truss span was secured with temporary restraints. The height of the temporary supports was configured to allow access for SPMTs to position underneath the assembled span. SPMTs moved the assembled span from the staging area to the lift location. An LR1250 crawler was used to lift the assembled truss spans delivered on SPMTs. The deck panels were lifted using an HTC 8675 crane.

Project Challenges:

The roadway width underneath the west span was not adequate to fit both the crane and the truss delivery. Therefore, a 5.3m x 43m zone at the west edge of the roadway needed to be backfilled, densified, and leveled. The crane needed to pick the load up to allow the SPMTs to be removed and then walk with the load to the middle of the roadway to set the span within its lifting radius limits. After lifting, the crane needed to adjust the boom angle, swing the truss to align with the final orientation, and travel about 31m to the setting location. To achieve the orientation angle of the truss in elevation, the rigging was configured to include shackles. A chain of extra shackles on one side was used while keeping the sling lengths identical.

Erection Video Link: https://www.youtube.com/watch?v=YPnqjoQH4GA