Project category

Energy

Location

La Tuque, Qc

Value($)

39 000 000

Customer

Hydro-Québec

Year

2005-2009

Additional informations

Remachining turbines from groups 2, 4 and 6. Rebuilding the water intakes for groups 1 to 6 of the 294 MW generating station

Main Work Performed

• Installation of steel modular cofferdams using a high capacity bridge crane and overhead gantry (upstream and downstream)
• Sealing the underwater cofferdams with the help of a team of commercial divers
• Pumping to dry out the intake turbines
• Concrete demolition and excavation of bedrock in the bend of the intake in order to increase water flow
• Use of high-pressure jets of water to clean the bedrock
• Use of shotcrete to channel water leaks in the bend of the intake
• Building the reinforcement to suit the new hydraulic profile
• Installation of prefabricated moulds and concreting the intake
• Disassembly of moulds and cleaning
• Crack grouting
• Repair (demolition, form assembly and concreting) the valve water chamber (upstream and downstream)
• Building and installation of an entirely new set of valves and valve guides (upstream and downstream)
• Assembling forms and reinforcement and concreting embedded parts for the valve guides
• Assembling forms and reinforcement and concreting new deck slabs downstream from the station
• Sandblast cleaning and painting of penstocks
• Repairing the concrete of the downstream surface of the dam
• Building and installing a steel structure which gives access to the downstream deck

Honours and Distinctions

• Armatura 2010 awarded by Institut d'Acier d'Armature du Québec (IAAQ) category Favourites
• 2010 Sustainable Development Prize for Engineering and VRD awarded by Hydro-Quebec in partnership with the ACRGTQ and Constructo