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gPresentation outline1. Project overview2. Specific design challenges
a) Precast tunnel liningsb) Emergency exitsc) Pipe and conduit routing
3. Modelling summary4. Project Manager’s remarks5. Questions and comments
g1. Project overview
Toronto and its subway• Largest metropolitan area in Canada• Population of 5.5M (one-fifth of Canada’s population)• Established transit authority (“TTC”)
– First subway line opened in 1954– Extended every decade since (except 1980’s), but nothing since 2002– 65 stations on three lines– Average ridership 1.25M trips per day
g
The Spadina Subway Extension is one of the largest transit expansion projects to be undertaken by the Toronto Transit Commission • 8.6 km alignment• Six new stations• The twin tunnels design of 6.7 km of twin 5.4 m bored tunnels• Six emergency exit shafts and surface buildings• Seven cross-passages
What is TYSSE?
Toronto-York Spadina Subway Ext.
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1. Connects York University to central Toronto2. Addresses York’s U’s status as Toronto busiest
bus terminal3. Helps establish a ‘downtown’ for York Region4. Provides impetus for development in the
troubled Jane-Finch area.
Why TYSSE?
Toronto-York Spadina Subway Ext.
gFeatures
•100% tunnelled (except stations)•100% in soil (no rock)•Significant portions are “off-piste”• Third party issues• Building settlement issues
•18 month design schedule (to be in time for 2015 PanAm Games)
Toronto-York Spadina Subway Ext.
gPrecast Concrete Tunnel Lining
Challenge:• Approx. 8 500 rings (51 000
segments)• Only one chance to get it right• Un-official company policy: one
innovation per contract• Wanted to do two:
1. Universal ring configuration2. Guide rods to “force” proper
erection technique
PCTL
gPrecast Concrete Tunnel Lining
Solution:• Develop a 3D parametric model of
a complete ring to verify it works• Develop contract drawings based
on modifying our “standard” 12-drawing package (MicroStation)
PCTL
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Functions:• Code-compliant egress routes for
passengers• Entry point for Emergency
Response teams• Entry point for TTC maintenance
crews• Electrical and comms equipment
rooms• Low-point EEBs have tunnel
drainage sumps, pumps, etc.• Fire hydrant connection for
charging tunnel standpipe
Emergency exit buildings
EEBs
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Challenge:• Multi-discipline design• Small footprint as EEB shafts are
shoe-horned between tunnels• Constructed in advance of tunnels,
so have to absorb all the construction tolerances
• Move up and down with vertical alignment, which is the last parameter to get frozen
Emergency exit buildings
EEBs
gEEBs
Emergency exit buildings
Solution:• PlantSpace™ models for each EEB• Structural model forms base• Structural model includes shoring• Mechanical and electrical models
reference it• Generate quantities• General equipment lists• Generate tag lists for equipment,
conduits and piping
gFire line connection
Solution:1. Track alignment from InRoads2. Determine vertical and horizontal
offset of tunnel axis on curve3. Propagate 3D PCTL models along
alignment4. Add structure clearance envelope
volume for superelevated case5. Add piping model 6. Le voila!
g3. Modelling summary
Notes:1. Didn’t start with a master plan2. Selection of applications based on team
members’ existing skills3. Client was neutral
• Concerned only that final drawing product was compliant
• No intention of making use of results from data centric approach beyond drawings
g3. Modelling summary
Reference Line Alignment
Track AlignmentsBuried Utilities
Topo
6 x EEBs Structural/Architectural
6 x EEBs Mechanical & Electrical
From client From client
From client & 3rd Parties
6 x EEBs Civil
•Plan & profile dgn’s
•Utility relocation drawings•Site plans•Traffic staging drawings•Sedimentation & Erosion Protection dgn’s•Restoration drawings
•Shoring dwgs•Structural drawings•Architectural drawings•Quantities
•Piping dwgs•Electrical dwgs•Mech equipment lists•Electrical equipment lists
From locates and pot-holing
From surveyor
InRoads
InRoadsInRoads
InRoads
2D μstn
PSDS
PSDS
g3. Modelling summary
PCTL “standard set”
3D Parametric model
μstn
•Check of reinforcement cover & placing tolerance•Check of segment hardware fit•Check of joint plane orientation•Final mock-up ‘print’
•General arrangement•Developed plans•Reinforcing dgn’s•Fabrication tolerance dgn’s•Erection sequence dgn’s
gProject performance
• Accommodated late alignment changes and still met the milestones• Issued three tender packages on schedule (PCTL supply, plus two tunnel
construction packages)• Only one of four main design contractors (>$20M) to do so• All bids below engineer’s estimate
A+
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• PCTL supply is on track following a shaky start
• Southern tunnels (McNally-Kiewit)– About 4 months behind schedule– About 300 m advance on first drive– Running 2 shifts + maint. shift– Ring build is top-notch– 2nd TBM just started – Two EEB shafts excavated, base slabs
in, walls being poured– Main issue is skilled labour shortage
• Northern tunnels (OHL)– About 9 months behind schedule– Preparatory works and shaft sinking– Very difficult contract
Construction performance
g4. PM’s remarks
• Get the client/end user engaged in the modelling• Plan the modelling• Use a CAD file management/control platform (e.g. ProjectWise)• Get the best people you can for it• Plan the training• Have a good technology partner (thanks, Bentley)