Extensive micropiling work, required for shoring in confined spaces, was used to shore the perimeter of the station box.
Excavated material is distributed in the ocean only after it has been tested by an independent environmental testing agency. 30,000 cubic meters of material was excavated from the site.
Excavation and shoring work for the station box was completed in 11 months producing a station box 67 meters long, 19 meters wide and 20 meters deep. Yaletown-Roundhouse Station is one of the smallest underground stations on the Canada Line.
Formerly an entrance to a City parkade, the small brick building in Bill Curtis Plaza was removed to accommodate the remainder of the station footprint. Heavy blue mesh, used to encase the structure, contained dusts and debris during the jackhammering work. Historical timbers from the structure were salvaged.
Exposed rebar for exterior walls frames the base slab entrance to one of two bored tunnels 6.1 meters in diameter, on the west side of the station. In total 667 tonnes of rebar was used to build Yaletown-Roundhouse Station.
The walls of the excavation are supported by micropile and shotcrete walls. Additional support is provided to the micropile wall through ground anchors and 2 levels of steel bracing. The steel bracing consists of continuous waler beams around the excavation at each level. 22 circular hollow struts across the pit were installed measuring 18 meters long, 450 millimetres in diameter, and weighing approximately 2.5 tonnes each.
Construction of the lower concourse level with half of the concourse slab and columns poured. Rebar in centre of station constructed for next set of columns.
With the roof slab on the east side of the station poured and walls constructed, the next step for construction will be false work for pouring the station roof.
Formerly the site of the Canadian Pacific rail yards and later the location of the 1986 World’s Fair (Expo 86), Yaletown has a long industrial and now residential history. The neighbourhood features high-rise housing, trendy clubs, great restaurants, parks and a picturesque stretch of Seawall. It’s also one of Vancouver most popular residential neighbourhoods. The Yaletown Station entrance can be found on Davie Street at Mainland Street, just seconds from everything Yaletown has to offer.