Hermine mechanical ventilation station

New mechanical ventilation station construction project - Fall 2012 to Fall 2014

As part of its program for refurbishing métro infrastructure, we are building a new mechanical ventilation station on the Orange line, between Square-Victoria and Place-d’Armes métro stations.

News update - July 2014

Construction work will continue on site even during the construction holiday. This measure is needed for the project to stay on schedule.

Still, work hours and noise levels will comply with borough regulations at all time.

In cooperation with Ville-Marie borough and the city of Montréal, a traffic plan has been established for motorists and for active transport users in order to minimize the impact on traffic flow in the area.

Click on the plan to enlarge

For those arriving from the north-end of the island to access Highway 10:

  • Take de Bleury Street via du Parc Avenue, or Saint-Urbain
  • Turn right on Saint-Jacques

For those coming from the eastern part of the island:

If you drive eastbound along Viger Avenue:

  • Turn left on Saint-Urbain
  • The, turn right on Saint-Jacques Street

You wish to avoid Viger Avenue?

  • Drive along René-Lévesque Boulevard
  • Turn left on Saint-Urbain Street
  • Then, turn right on Saint-Jacques Street

Click on the plan to enlarge

Step 1

Preparation of the work site

  • Installation of the jobsite partitions
  • Installation of equipment

Main equipment used:

  • Truck, crane, hydraulic drill, and compressor

Approximate construction timeframe: November 2012 (1 month)

Step 2

Mechanical ventilation station excavation

Surface excavation

  • Soil excavation over bedrock (approximate volume 4300 cubic metres) Drilling through rock to determine the well perimeter to excavate

Excavation below ground level

  • Drilling and smaller scale dynamiting (approximate volume 4800 cubic metres)
  • Extracting rock pieces

Main equipment used:

  • Drill, crane, excavator, truck and fan

Approximate construction time frame: December 2012 to November 2013 (11 months)

Step 3

Concrete work for well and gallery construction

  • Reinforcement of rockface (concrete work floors, walls and ceiling)

Main equipment used:

  • Concrete mixer and concrete pump

Approximate construction time frame: December 2013 to June 2014 (7 months)

Step 4

Installation of mechanical and electrical equipment

  • Equipment delivery to work site
  • Lowering of equipment into the well
  • Installation of equipment
  • Performance tests on mechanical equipment

Main equipment used:

  • Crane and delivery trucks

Approximate time frame: July 2014 to September 2014 (3 months)

Step 5

Architectural finishes and landscaping

  • Construction of exterior building. All traditional construction tradesmen necessary to build the exterior structure are involved, such as framing carpenters, carpenters, bricklayers, roofers, glaziers and landscapers.

Main equipment used:

  • Truck, forklift, scaffolding, and boom

Approximate construction time frame: October 2014 to November 2014 (2 months)

The métro ventilation system has three functions:

  • Comfort ventilation - Regulates the temperature for the comfort of customers. By breaking and accelerating, trains produce nearly 80% of all heat in the underground network.
  • Night ventilation – Night ventilation ensures a supply of fresh air for night time workers carrying out routine maintenance tasks.
  • Emergency ventilation - Used for smoke control. Provides a safe evacuation route for people and a safe access route for firefighters should an incident occur.

From outside, the building appears to be modestly-sized. Inside, a tunnel links the shaft to the metro tunnel. In that tunnel are two large fan units along with noise-dampening walls.

The metro network currently has 89 mechanical ventilation stations. Ventilation units are required between each metro station.

Yes, the project consists in replacing the old mechanical ventilation station built around 1966 and located at 303 Viger St. West. The new station will be built on a small section of the parking lot next to 425 Viger St. More efficient, the unit will conform to new safety standards, while improving the supply of fresh air for commuters and metro employees.

In order to meet current safety standards and the City of Montréal’s noise by-laws, the ventilation station would need to be significantly expanded. And because the current unit is integrated into another building’s main floor, using the same site was impossible.

The parking lot was selected after an in-depth analysis of four potential sites. Also, the nearby Highway 720 tunnel south of Viger St. makes it impossible to build on that side.

A ventilation station must also be located next to the métro tunnel, about halfway between the two metro stations it serves.

Working with city officials, we made sure the proposed building would fit in the neighbourhood. The building will be about 9 metres tall and about 5 metres wide. The building is shown in the sketch above.

The work will take approximately two years to be completed in the fall of 2014.

Any construction work likely to produce noise will be restricted to between 7 a.m. and 7 p.m. Monday to Friday. However, adhering to the project's calendar for construction may require workers to do overtime on weekdays and/or weekends. Any additional worktime will comply with municipal regulations.

During construction, an independent outside firm will supervise excavation work. This firm will ensure that strict standards established by the City of Montréal and the STM regarding vibrations caused during excavation are respected. Seismographs will be installed in strategic areas to measure vibrations.

A traffic impact study will help establish an optimal plan for cars and active means of transportation. A traffic plan will be prepared in collaboration with the Borough.

As with any construction site, there might also be dust on occasion. Measures will be taken should it become a problem.

No. These ventilation units are equipped with powerful noise suppressors. Once operational, noise emissions will comply with municipal regulations. The noise level around the structure will not exceed 50 decibels when both units are operating together at full capacity (an exceptional situation). That noise level is so low that it cannot be heard over a normal conversation or normal ambient noise in the area. The units will be installed under Hermine St, one 9 metres and the other 15 metres below ground.

No, a ventilation station produces no contaminants. Rainwater or snow falling into the ventilation shaft will be collected by the métro pumping system and released into the municipal sewage system.

No. These ventilation units are equipped with powerful noise suppressors. Once operational, noise emissions will comply with municipal regulations. The noise level around the structure will not exceed 50 decibels when both units are operating together at full capacity (an exceptional situation). That noise level is so low that it cannot be heard over a normal conversation or normal ambient noise in the area. The units will be installed under Hermine St, one 9 metres and the other 15 metres below ground.

No. A mechanical ventilation station with its equipment cannot be transformed into a métro station entrance.

Motorists will be detoured on Saint-Antoine Street. Then, they must take Saint-Laurent Boulevard to avoid higher traffic volume on Saint-Urbain where the fire station is located.

Click on image to enlarge it

Top of page