As part of the Transmountain Expansion project, Arch Engineers tackled a challenging truss bridge installation that required critical mid-lift modifications. Initially, the plan called for the bridge to be installed in three pieces, supported by two light piers. However, after mobilization, the installation strategy changed significantly. The bridge would now be installed in two sections, landed on abutments, and joined with a mid-air splice connection. Consequently, the rigging plan also shifted from an 8-pickpoint lift to a 6-pickpoint lift to accommodate crane capacity limitations.
Our first responsibility was to redesign the structural connections to fit the updated installation sequence. We carefully reviewed the original design and implemented necessary modifications. Throughout the process, Arch Engineers prioritized structural integrity, safety, and ease of construction. We ensured the new connections met all demands without compromising performance.
Next, we reviewed and approved the mid-lift splice connection and rigging modifications. Our team conducted detailed analyses to confirm the splice could be safely executed while under load. Moreover, we verified that the adjusted rigging configuration aligned with crane capacity and load distribution requirements. This rigorous review was essential to prevent risks during the lift.
Ultimately, this work on the Transmountain Expansion project demonstrated Arch Engineers’ ability to deliver precise and adaptable engineering solutions. We successfully responded to evolving site conditions and helped keep the project on schedule, even under tight deadlines.