4. How We’re Building Fairbank Station:
Support of Excavation – Top Down
• Also known as ‘shoring’ or ‘piling’, support of
excavation is a common step in the process of
constructing a building.
• An area the size of the station’s footprint
(about 100m x 20m) called the ‘station box’ is
cut, steel piles are installed around the
perimeter, a shallow area is excavated, and
braces and tie-backs are installed at the sides
to support excavation.
• A concrete roof slab is constructed and placed
over top of the excavated area, restoring
traffic while crews work safely underground.
• Support of excavation at Fairbank Station will
take approximately 1.5 years to complete
5. Fairbank Station Construction Update
Demolition at the Service Building
Installation of geotechnical monitoring equipment
Telecommunication utilities relocation
Piling at the Main Entrance and Service Building
Hydro utilities relocation
• Continue piling on the north side of Eglinton Ave W
• Continue wet utilities relocation work on Eglinton Ave W
• Implement traffic staging on the south side of Eglinton Ave W and commence piling
15. How We’re Building Oakwood Station:
Support of Excavation
• Oakwood Station is being constructed using a
mined method known as Sequential Excavation
Method or SEM. The first stage is support of
• Support of excavation (shoring) is a common step in
the process of installing the foundation of a
• In the first stage, crews will install
steel piles around the perimeter
of the entrance. This has been
completed at both entrances.
• In the second stage, crews
excavate the area level by level,
installing braces and tie-backs as
they progress. This work is
underway at the main entrance.
16. • Mining occurs from inside of the excavated main
entrance after the support of excavation is
• The underground area to be excavated is divided
into manageable segments and the segments are
excavated in a planned sequence.
How We’re Building Oakwood Station:
Sequential Excavation Mining Method
• Within the mined area, the
station box is constructed
accommodating the rail
platform and rail
17. Oakwood Station Construction Summary
Geotechnical Investigation completed
Demolition 1578-1584 and 1611-1619 Eglinton Ave W completed
Stage one of long-term closure (main entrance)
Support of excavation (shoring) work started at Main and Secondary entrances
Temporary traffic signals installations
60% design completion
Piling operations completed at both entrances
Temporary power works completed (Civil works completed, energization pending
19. Oakwood Station Construction Lookahead
• Excavation at main entrance - underway
• Geotechnical Instrumentation and Monitoring Plan (phase 2 installations ) –
• Overhead crane assembly at main entrance - underway
• Site service connections (water & sewer) - upcoming
– Starting August 14st
– Some overnight work to reduce impacts at intersection
• Stage 3A set up late August/early September 2017 (Staging under review)
• Dewatering wells installation on the sidewalk along Eglinton (south and north
• Utilities Protection (Sewer lining and replacement, work on the watermain)
• Mining work late 2017 (from main entrance)
21. Dewatering System Installation & Operation
• The term “dewatering” means pumping from the ground water at a site where
there will be excavation.
• Wells will be drilled in the ground and will be connected above ground in the area
• System will operate for the duration of construction (2020).
Support of Excavation (Shoring)
Shoring is a common step in the process of installing the foundation of a building.
This will support the surrounding loads until the underground levels of the building are constructed.