Preparation for Tunneling, Don River Central Waterfront Coxweli Sanitary Bypass Tunnel Project in Toronto, ON

摘要

The Don River & Central Waterfront Coxweli Sanitary Bypass Tunnel Project in Toronto will extend approximately 10.5 km from Ashbridges Bay Treatment Plant west under Lake Shore Boulevard, north under Bayview Avenue and east through the Don River park area to the Coxweli Ravine Park. The tunnel will be mined by using a shielded tunnel boring machine capable of operating in EPB mode and lined by using a precast concrete segmental tunnel linear with an internal diameter of 6,300 mm and external diameter of 6,900 mm. In addition to the TBM excavated tunnel, the scope of this project includes two sections of tunnel using hand tunnel construction methods, five shafts corresponding to the locations of 5 sewer structures, eleven drop shafts, vent shafts, deaeration and adit tunnels to be designed and constructed, two diversion structures and two consolidation sewers to be constructed using mainly open cut and shored excavation methods, 8507 Connection from the existing wet weather flow outfall to one of the shafts and North Toronto Sanitary Trunk Sewer from the existing sewer to one of the shafts. This paper summarizes the preparation work that has been done prior to the launch of the TBM.