Hunt Club Pedestrian Bridge Erection, Ottawa, ON

 

Noteworthy Project Experience

Complex construction phasing to ensure highway closures minimized, complex geometry control to satisfy strict tolerances.

Project Description

The Hunt Club Pedestrian Bridge is a cable-stayed pedestrian bridge with orthotropic steel plate deck spanning the Airport Parkway in Ottawa, ON. The bridge has a single, cast-in-place curved concrete tower supporting asymmetric spans of 49 meters and 21 meters. The deck is an orthotropic steel plate with wind fairings and tuned mass dampers added for aerodynamic stability.

Harbourside Engineering Consultants (HEC) were brought in as erection specialists to work with general contractor Louis W. Bray Construction in building the structure designed by Delcan. HEC’s scope of work included developing erection methods and alternatives, designing temporary works and traffic control measures, and participating in integrated team project planning activities.

HEC staff developed geometry control procedures including laying our survey points on the bridge to monitor geometry throughout construction. A method was developed to position and survey the weldment located at the top of the tower. Temporary works were designed to fine-tune the weldment position before connecting it to the structure with cast-in-place concrete.

As part of the erection phasing, HEC developed scenarios and produced drawings showing crane and transporter locations for delivering and lifting decking segments. Careful attention was given to field splice bolting requirements in the temporary condition.

Using steel sections readily available in the fabricator’s stockpile, HEC designed a temporary bent to support the deck segments during installation and cable stressing. HEC also provided the design and layout of barriers and traffic control measures to protect the temporary bent in the event of a traffic collision.

HEC reviewed the erection scheme proposed by Delcan, performed calculations and prepared drawings giving the catenary profiles of the stay cables. The sensitivity of cable installation forces to ambient temperature was also assessed. HEC engineers prepared erection sequence drawings outlining the installation of stay cables and removal of temporary works.

HEC management staff were integrated into the overall project management team, participating in project planning meetings and risk mitigation sessions. This structure was originally designed by another firm, when various setbacks prompted the City of Ottawa to dismiss the original design firm and retain Delcan to redesign the bridge. HEC was added to the project team as erection specialists when the redesign was near completion. Given the impact of previous project setbacks there was added emphasis to adhere to the revised project schedule and anticipate and mitigate any risks inherent in the remaining construction work.

The Hunt Club Pedestrian Bridge is currently under construction with an expected opening in early 2015.

Client: Louis W. Bray Construction Ltd.

Value: $9 M (Approximate)

Year: 2014

Role: Bridge Erection Engineer