Pattullo Bridge Replacement

A new 6-lane bridge is under construction across the Fraser River to replace the ageing Pattullo Bridge. The bridge has a single tower cable-stayed main span and steel girder supported approaches with multiple connections to the road and MUP systems for New Westminster on the north and Surrey on the south.

BASIS undertook multiple roles for the Contractor on this highly complex project, including permanent and temporary works design, and assessment/monitoring of existing structures during the construction. Tasks included:

• Design of the micropile foundations for the steel girder spans for the Columbia St. offramp abutment and Multi-Use Path bridge approach piers 

• Slope stabilization analysis and design for new piers situated on the steep slopes on the north approach

• New retaining wall design for the Royal Avenue Underpass

• Temporary and permanent retaining walls required for new drainage outfall work at Front St. in New Westminster

• Risk assessment and monitoring of the hydraulic impact (scour and deposition) from in-stream works on the downstream Fraser River bridges which include road, rail, and transit bridges

• Vibration and settlement monitoring for adjacent structures for impacts due to pile driving and preloads

• Temporary sheet pile and shotcrete anchor retaining walls required for staged construction of the south approach and abutment

• Temporary works design for crane pads and construction activities

• Erection cart design for bridge deck panels on the south approach

• Independent Structural Reviews for bridge girder erection

• Independent check of demolition engineering for the existing Pattullo Bridge.