Mixed face

The Crosstown is a light rail transit line, which is part of the regional transportation plan for the Greater Toronto and Hamilton Area. The project will provide a 19km corridor across Eglinton Avenue, connecting ten stops and 15 underground stations with a 10km twin-bored tunnel. Dr. G. Sauer & Partners provided detailed design for Laird, Avenue and Oakwood stations. A combination of Cut-and-Cover construction for the shafts and mined technique (SEM) for the tunnels has been utilised. The 24/7 supersvision services provided engineering support, detailed inspection and documentation by a team of eperts for each of the three stations.

The TTP are delivering a new two track rail tunnel of approximately 176m length crossing the Highway 401. The purpose of the tracks is to increase capacity along the Kitchener GO commuter rail corridor as well as to accommodate the new Union-Pearson (UO) Express service. The new rail tunnels are mined under the 401/409 Highway using the Sequential Excavation Method (SEM). Our role on this assignment was to provide tunnel design services addressing the challenging conditions (e.g., very low overburden, intercepting piles and maximum settlement allowance) as well as providing on site design representation.

Lima's Metro Line 2 project comprises 27 km of all-underground Line 2, plus an 8 km underground spur to the airport which will make up the first section of Line 4. Thirty-five new stations are being constructed, seven of them mined and the rest constructed by cut and cover. The MDL2 consortium is to design, finance and build the new line and to operate and maintain it for the following 30 years.

The Thames Tideway Tunnel is an under-construction 25km tunnel running mostly under the tidal section of the River Thames through central London. It will provide capture, storage and conveyance of almost all combined raw sewage and rainwater that currently overflow into the river. Once constructed, the main tunnel will have an internal diameter of 7.2m and will run from -30m at Acton, West London for over 25km under central London down to -70m at Abbey Mills in the East. It will connect 34 of the most polluting combined sewer overflows (CSOs), via transfer tunnels. The tunnel will transfer the captured sewage to the Stratford to East Ham part for onward delivery to Beckton Sewage Treatment Works.

The Crosstown LRT Project is a Light Rail Transit Line that will run along Eglinton Avenue between Mount Dennis and Kennedy Station. This 19km corridor will include a 10km underground section between Keel Street and Laird Drive. This section comprises 2 bored running tunnels; 12 stations of which 3 (Laird, Avenue and Oakwood) will be built underground using the SEM method; 12 cross passages connecting the bored running tunnels and 3 emergency exit buildings. Dr. G. Sauer & Partners performed an initial, detailed inspection of the bored running tunnels, every cross passage and every emergency exit building to establish the condition of these structures prior to takeover by CTS.

The CSST project is part of the Ottawa River Action Plan to greatly reduce the frequency of sewage overflows during storms entering the Ottawa River. The tunnels will hold up to 43,000 m3 of sewage overflow which will be treated and returned to the river gradually. The project comprises design and construction of two TBM tunnels running east-west and north-south along 6.2 km in total, and multiple shafts and support buildings such as odour control facilities. Dr. G. Sauer & Partners supported the contractor with the feasibility study on TBM utilisation. Reduction of probe drilling requirements increased TBM excavation rates, by developing criteria for pre-excavation grouting.