Seven six-foot diameter tunnels are currently being bored as construction moves forward on the 800-foot pedestrian tunnel linking Toronto Island with the mainland.
TORONTO
Seven six-foot diameter tunnels are currently being bored as construction moves forward on the 800-foot pedestrian tunnel linking Toronto Island with the mainland.
Once excavated, the drift tunnels will be backfilled with concrete via a continuous pour. These pours will employ the on-site batching assembly, which will minimize the need for concrete mixing trucks to be used on site and through the local neighbourhood. The bulk of this work will be performed underground in the mainland shaft and under the Western Gap.
Materials and equipment will be raised and lowered into the shaft/tunnel using on-site craning equipment.
The bulk of material deliveries to the site will be by dump truck and will include aggregates for on-site concrete mixing.
The bulk of material removal from the site will be by dump truck and include excavated material (shale) from the drift tunnel excavation. Excavated material will be brought to the surface via craning and will be stockpiled on-site prior to removal.
Island shaft construction involves the excavation of material, which is being hauled, via truck and ferry, off-site for disposal.
Directional drilling work involves the installation of new city services parking area on the northern end of the island across the airport and to a pumping station in the vicinity of Hanlan’s Point Ferry Terminal. Installation of the exterior steel casing is underway.
Expected completion is spring 2014. The tunnel is being financed by the private sector and paid for by Billy Bishop Toronto City Airport users via the existing BBTCA Airport Improvement Fee.
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