PORT MANN BRIDGE
The 2,073 m (6,801 ft) long Port Mann Bridge carries the Trans Canada Highway (TCH) with ten lanes of traffic across the Fraser River in Vancouver, British Columbia. The crossing includes an 850 m (2,789 ft) long cable-stayed main span unit with 1,223 m (4,012 ft) long precast concrete segmental box girder approaches. The cable-stayed structure includes a 470 m (1,542 ft) main span and 190 m (623 ft) side spans. The 65 m (213 ft) wide superstructure consists of two five-lane decks separated by a 10 m (32 ft) median where the central pylons are located.
Each separate roadway is supported by two planes of stay cables and consists of a composite structure of steel edge girders and floor beams with precast concrete deck panels. The single mast concrete pylons house anchorages for all four planes of cables. The pylons reach a height of about 160 m (524 ft) over the water, with the upper 40 m (131 ft) reserved for the composite steel-concrete stay anchorage housings. The approach spans consist of three parallel precast segmental box girders built by cantilever construction above the water and by span-by-span construction on land.
Foundations for the Port Mann Bridge are generally 1.8 m (5.9 ft) steel piles or 2.5 m (8.2 ft) drilled shafts supported on a firm ground till layer under the loose sand deposits at a depth below the river. Design-build project.