HIGH-END TRAIL-MAKING

An elegant yet unconventional method that pushes beyond standard construction practice has been successfully deployed for a bridge replacement project in Canada.

by Iman Soltani Gordfaramarzi

Bridge owner: British Columbia Ministry of Transportation and Infrastructure
Contractor: Formula Contractors
Engineering: Allnorth Consultants
Design: AtkinsRéalis

Challenges

Remote terrain and restricted access
Steep slopes and dense forest limited physical access to the site, ruling out conventional approaches such as temporary roads or work platforms.

Environmentally sensitive setting
Strict protection of Holt Creek and its surrounding habitat prohibited in-water activity, vegetation clearing and the installation of large crane pads.

Limitations of conventional methods
Standard crane-assisted or full-demolition strategies proved unworkable due to spatial restrictions, environmental risks and logistical impracticalities.

Uncertain condition of existing structure
With no record drawings and visible deterioration in the century-old timber trestle, the bridge’s capacity to withstand temporary construction loads was uncertain.

Demanding construction sequencing and stability
Tight spatial constraints and interdependent stages of demolition and erection required exceptional precision to maintain safety and structural stability throughout.

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