Stabilization of excavation for the Rogers Arena South Tower, Vancouver
The Rogers Arena South Tower is part of the Aquilini Centre, a construction project in northern Vancouver. At this location, three new towers are being built around the Rogers Arena – the home of the Canucks hockey team – that will accommodate offices, apartments and sports and multiple use facilities.
The South Tower with five underground parking decks and 31 levels above ground is being built on a small, triangular area near the entrance to the Rogers Arena. The realization of the excavation between the southern wall of the stadium, the Georgia Viaduct, Pacific Avenue and Griffiths Way was a special challenge because the space is extremely confined. The Contractor had to use special care during excavation and shoring to ensure the stability of the existing structures surrounding the excavation. Furthermore, buried debris and the underground utilities complicated construction work.
Micropiles and a retaining wall stabilized the excavation
A foundation consisting of micropiles and a retaining wall were employed to stabilize the excavation. Since the Georgia Viaduct is used by approx. 2,000 vehicles per hour during peak times, the foundation had to be built with special care in this area. The three viaduct piers were stabilized by installing 12 micropiles evenly around each pier. Each of the 36 micropiles consisted of a threadbar with double corrosion protection that was installed to a depth of approx. 25.3 m (83 ft).
The piers were additionally monitored during the entire construction work using a variety of instrumentation, and none of the piers showed any sign of movement.
The conventional shotcrete reinforced wall was tied back using rows of tieback anchors. The anchors were installed with vertical spacing of about 1.2 to 1.8 m (4 to 6 ft) and anchored against a horizontal shotcrete waler.
Bar and drill anchors with total length of about 15 km
For this purpose, DSI Construction Canada produced and supplied bar anchors and drill anchors with a total length of 15,240 m. The anchor systems were installed at various angles from 5 to 45° and at depths of up to 24.4 m (80 ft).
The Contractor completed all the anchoring and excavation work successfully and safely with no detrimental impact on the surrounding structures.
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