HYDRO QUÉBEC has recently completed the process of commissioning the Romaine-1 hydropower project after construction completed late last year. The 270MW surface powerhouse is equipped with two 7.5m-diameter, inclined, concreted underground penstocks with an horizontal 25m-long steel penstock section connected to the powerhouse.
Grouting of the steel penstock section was ongoing this winter for Hydro Québec’s Romaine-3 complex. Construction is in the last phases, with the completion of the powerhouse mechanical and electrical installations. Commissioning is planned towards the end of 2017. The 395MW surface powerhouse is equipped with a 1,675m-long, D-shape, 16m by 12m tunnel with two 60m-long, 5.6m diameter steel penstock section connected to the powerhouse.
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The City of Montreal is building a hard rock TBM tunnel for a water main. The Rosemont tunnel has broken through on November 12, 2015 with a total drilled length of 3,950m. The 3m-diameter open Robbins TBM started turning on 5 January 2015 for a total of 250 working days (with two 12-hour shifts, give days per week). The average rate of advance was 13m/day with the record day of 38m/day. On the other hand the machine was slowed down to 1.5m/day during 20 days when it crossed a fault zone. To read more about the project, see the feature on page 20.
Work is being carried out by Foraction as the sub-contractor for Les Entreprises Michaudville, the main contractor. The contract is valued at CAD 73M (USD 56.2M). The project began in May 2014 and is scheduled to end in October 2016 with the final pipe installation and valve chamber construction.
Axor Group is working on the Hydro-Canyon project which has a capacity of 23.2MW. This is a relatively small project under construction on the Sainte-Anne River in the city of Québec. The project includes an intake, a 440m-long pressure tunnel, a penstock and a powerhouse. The project also involves the construction of a large soil nail wall for the construction of the access road to the powerhouse (up to 18m high). In the photo, the breakthrough at the powerhouse is pictured, with the soil nail wall above the portal. This drill and blast tunnel is D-shaped with dimensions of 4.5m by 4.5m at the greatest point, and the static pressure will be around 60m of water head.
Tunnel excavation was completed in December 2015, with full breakthrough on January 14 with the powerhouse excavation. So the tunnel was completed before the exit portal was dug, which is not common in the industry. Excavation began on 9 June 2015 for a total of 135 working days (one day shift, five days per week) and an average advance rate of 3.3m/day. Plant commissioning is planned for the end of fall
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