Construction Liaison Committee June 14 2017 Agenda Leaside Station Update Laird Station Update Leaside Station Concept Aerial View Main Entrance Secondary Entrance 60 rendering Accessible Entrance ID: 606381
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Slide1
CROSSTOWN LRT
Construction Liaison Committee
June 14, 2017Slide2
Agenda
Leaside Station Update
Laird Station UpdateSlide3
Leaside Station Concept:
Aerial View
Main Entrance
Secondary Entrance
*60% rendering
Accessible Entrance
Accessible Entrance
Outdoor bicycle parkingSlide4
Leaside Station: 2016 in Review
Demolition at 1787 Bayview Ave completed
Median Removals & temporary traffic signals installations
Utility relocations (hydro & telecommunications), underway or complete
Support of excavation (shoring) work started at Main Entrance
4Slide5
Year
Quarter
Construction
Activity / Closure
2017
Q1
(Jan-March)
Bell,
hydro and other telecom u
tility relocations
Support of excavation (shoring) underway at Main Entrance
Stage one for support of excavation activities in right of way (work will be completed in 4 stages)
Q2(April-June)Stage one ongoingDrill to move to Secondary Entrance in late June/early JulyTemporary Site Service Connections (hydro)Dewatering System InstallationQ3(July-Sept)
Stage one
B
Stage two support of excavation activities in right of way
Q4
(Oct-Dec)
Stage three of support of excavation activities in right of way
Leaside Station: What to Expect in
2017Slide6
How We’re Building Leaside Station
:
Support
of Excavation
Shoring
is a common step in the process of installing the foundation of a building.
In the first stage, an area the size of the station’s footprint (about 100m x 20m) will have steel piles installed around the perimeter. Then a shallow area
is excavated and braces and tie-backs are installed around the sides to support the excavation.Decking is then placed over the excavation to allow the crew to work under the roadway safely while traffic flow resumes above.
The shoring stage at Leaside Station started in January and will take approximately 15 months to complete.Slide7
How We’re Building Leaside Station:
Excavation and Mining
During the excavation, crews continue to work safely beneath the roadway.
At Leaside Station a section of the station box will also be mined during this time.
With the mining method, the underground area to be excavated is divided into manageable segments and the segments are excavated in a planned sequence.
The excavation creates a shotcrete-lined cavern
underneath Eglinton Avenue East.
Within the cavern, the station box is constructed accommodating the rail tunnels, associated platform and rail infrastructure. Slide8
Support of Excavation (shoring
): Station Box
Mined AreaSlide9
Support
of Excavation
(shoring): Stage OneSlide10
Proposed Stage 1BSlide11
Proposed Stage 2Slide12
Progress
Picture – Main Entrance Slide13
Progress
Picture – Station BoxSlide14
Laird Station Concept:
Aerial View
Main
Entrance (accessible entrance)
Secondary Entrance
*60% rendering
Eglinton Ave E
Laird Drive
SSlide15
How
We’re Building Laird
Station
:
Support
of Excavation
Laird Station will be constructed using a mined method known as Sequential Excavation Method or SEM. The first stage is support of excavation.
Support of excavation (shoring) is a common step in the process of installing the foundation of a building. 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.Slide16
Mining occurs from inside of the excavated entrances after the support of excavation is
complete.
This work
now underway
at the
secondary
entrance.The
underground area to be excavated is divided into manageable segments and the segments are excavated in a planned sequence.Within the mined area,
the station box is constructed accommodating the rail tunnels, associated platform and rail infrastructure. Laird station has one of the longest station areas with approximately 500m to be mined. This is to accommodate special track to store a LRV between the tracks or for an LRV to change direction in the event of a service disruption.
How We’re Building Laird Station:
Sequential Excavation Mining MethodSlide17
Laird Station:
2016 in Review
Geotechnical Investigation completed
Demolition
at 250-256 Laird Drive completed
Utility relocations (hydro &
telecommunications)
Piling work completed and excavation work started at both entrancesTemporary traffic signals installations
17Slide18
Year
Quarter
Construction
Activity
2017
Q1
(Jan-March)
Site Service Connections -
Completed
Excavation (shoring) underway at Main (underway)
and
Secondary entrance (completed)Long-term closure at Main entrance – in place
Q2 (April-June)Crane erection secondary entrance – completedMining operations at Secondary entrance - underwayDewatering System installation - underwayConcrete pour into tunnels - underwayUtilities protection
Gas Main Support - underway
Sewer Lining - upcoming
Crane erection main entrance – upcoming
Excavation ongoing at Main entrance
Q3
(July-Sept)
Ongoing mining operations at Secondary entrance
Start of mining
operations at Main entrance
Q4
(Oct-Dec)
Mining
continues at both entrances (mid 2017 to late 2019)
Laird
Station: What to Expect in
2017Slide19
Laird Long Term ClosureSlide20
Support Works – Utilities Mitigation
What to expect:
Sewer Lining
Sewer lining is a process intended to increase the durability of the sewers.
A section of the sewer system is cleaned and vacuumed and a CCTV inspection is completed. Then
a liner is inserted
into the sewer section from within the maintenance holesThe process is designed to be generally non-disruptive and eliminates the need for excavation of the entire sewer section. Maintenance holes that will be accessed
are located on Eglinton Avenue East between Sutherland Drive and Brentcliffe Road.Lane closures will be required for this work. Pedestrian access will be maintained.
Above ground pipes will be in place between maintenance holes to bypass pump around the sewer lines during the liner installation. Due to the nature of the work, an unpleasant chemical odour may be noticeable in the vicinity of the maintenance holes and, in some circumstances, in the home. It is not harmful, however it can be limited by covering floor drains while the sewers are being lined.
A public notice with additional details will be distributed prior to work beginning. Slide21
Support Works – Utilities Mitigation
What to expect: Sewer Lining
Sewer Lining Activity ExamplesSlide22
Progress Picture – Main EntranceSlide23
Progress Picture – Secondary EntranceSlide24
Local Area Map
Station(s) under construction Slide25
Community Benefits – Laird Mural
Creation
of a mural that reflects the
Thorncliffe
Park
neighbourhood
Design
concept under
development
Production/painting is scheduled for the first week of July (July 4-7
)
Feedback welcome!Slide26Slide27