The 315-25 kV Le Corbusier substation and 25-kV underground distribution lines - Hydro-Québec
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Hydro-Québec
PROJECT NEWS
April 2021
The 315-25 kV Le Corbusier substation
and 25-kV underground distribution lines
About the project
In response to current and expected demand growth in Laval — a region that
in recent years has undergone major industrial and commercial development —
Hydro-Québec is building a new facility, the Le Corbusier substation, in the city’s
Centre industrial park.
The substation will be located on land owned by Hydro-Québec and will be
connected to the 315-kilovolt (kV) grid by a new line extending roughly 450 m.
The project also involves installing a number of 25-kV underground electricity
distribution lines from Le Corbusier substation to make the system that powers
the surrounding region more robust. Building the lines, which will run for
approximately 9 km in total, will entail drilling beneath both Highway 15 and
a railway line.
Visual simulation
of substation
Preparatory work
A portion of the future substation site will be cleared, after which
merchantable trees will be recovered (if applicable) and the cuttings
disposed of. DID YOU KNOW?
Any ash tree waste will be chipped on site before being sent to an Over 80% of our concrete
authorized site to prevent the spread of the emerald ash borer. plinths — that’s roughly
Land clearing will take place outside of bird nesting periods and 300 components — will be
will be followed by other preparatory work such as excavation, prefabricated! The special
compacting and earthwork. assembly process we’ve
Substation construction designed for the prefabricated
components of very large plinths
The next phase will consist of the construction of the civil
will reduce the duration of the
engineering structures, including the substation building and
the concrete plinths supporting the substation equipment, work on site and thus lower
in addition to the transformers, which lower the voltage for the risks to health and safety.
distribution to customers.
Project components 73°47' Infrastructure 73°46' 73°45' 73°44'
Planned substation
Planned 315-kV
15 Highway
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73°47' 73°46' Bureau 73°45' 73°44'
7491_bu_hq_get_035_200731_a.mxd
Document for information purposes only.
For any other use, please contact Géomatique, Hydro-Québec TransÉnergie et Équipement.
Location of work
2
Building the supply line
The supply line will comprise four new towers, all of which are to be
located on land owned by Hydro-Québec. After the tower foundations
are laid, the towers will be assembled on the ground, then erected.
The conductors are then unwound and, as a final step, the line will
be inspected before being brought into service.
Laying underground distribution lines
Excavation, backfilling and concrete-pouring will take place on
Hydro-Québec’s land and in the public right-of-way with a view
to installing the duct banks and cable vaults. Drill installed at the bottom of well.
Drilling work adapted to the local geology will be carried out
so that the cable ducts can be installed beneath Highway 15 at
Boulevard Dagenais and Boulevard Saint-Élzéar Ouest as well as
beneath the railway line at Boulevard Bellerose.
Once the civil engineering work is complete, the next step consists
of laying 25-kV cables in the ducts and connecting them, an operation
known as cable pulling and splicing.
Impact of the work
The work on the distribution system is expected to partially obstruct
traffic. Access to certain local homes and businesses could also
be temporarily blocked; if so, the residents and merchants affected After installation of a conduit,
will be notified. it is emptied using worm gear.
Traffic around the jobsites is expected to temporarily increase, Then the conduits for the cables
particularly on Boulevard Dagenais and Rue Michelin, owing to to run through are put in place.
heavy vehicles hauling materials back and forth.
Mitigation measures
Hydro-Québec is taking every possible step to minimize the inconvenience to local residents
and businesses and is working closely with the City of Laval throughout the planning process.
• Customers directly affected by the work on the distribution system will be notified in advance.
• To ensure the safe shared use of public roadways and access roads, temporary road signs will
be installed for all users as well as for snowmobilers and ATVers whose trails run alongside
the jobsites.
• Electricity supply will not be interrupted during the work.
• Most of the work will be carried out between 7 a.m. and 6 p.m. from Monday to Friday.
Work may occasionally need to be performed outside of these hours to honour agreements
reached with local businesses to minimize the impact on their activities or else to perform
specific tasks.
• An inspector will be on site to ensure that the work proceeds smoothly.
• Site restoration and clean-up will be done as each stage of the work is completed.
3
Construction of an underground duct
1 Excavation of
2 Construction of trench
3 Installation of formwork
the side walk to hold duct bank for pouring concrete
4 Pouring concrete
5 Backfilling and
6 Installation of
around duct bank resurfacing cable vault
Schedule
For more information
Info-project line – Laurentides: 1 800 465-1521, extension 6022 www.hydroquebec.com/projects/le-corbusier
Original text written in French.
Ce document est également publié en français.
2021E0588-A
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