Presentation outline

3. Presentation outline • Project overview • Specific design challenges • Precast tunnel linings • Emergency exits • Pipe and conduit routing • Modelling summary • Project Manager’s remarks • Questions and comments

4. 1. 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

5. TTC subway lines

6. What is TYSSE? Toronto-York Spadina Subway Ext. 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

7. Why TYSSE? Toronto-York Spadina Subway Ext. Connects York University to central Toronto Addresses York’s U’s status as Toronto busiest bus terminal Helps establish a ‘downtown’ for York Region Provides impetus for development in the troubled Jane-Finch area.

8. Features Toronto-York Spadina Subway Ext. • 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)

9. 2. Specific design challenges • Precast tunnel linings

10. PCTL Precast 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: • Universal ring configuration • Guide rods to “force” proper erection technique

11. PCTL Precast 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)

12. 2. Specific design challenges • Emergency exits

13. EEBs Emergency exit buildings 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

14. EEBs Emergency exit buildings 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

15. EEBs 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

16. 2. Specific design challenges • Pipe and conduit routing (a classic 3D problem)

17. Fire line connection How do you ensure the train won’t hit the pipe?

18. Fire line connection Solution: • Track alignment from InRoads • Determine vertical and horizontal offset of tunnel axis on curve • Propagate 3D PCTL models along alignment • Add structure clearance envelope volume for superelevated case • Add piping model • Le voila!

19. 3. Modelling summary • Notes: • Didn’t start with a master plan • Selection of applications based on team members’ existing skills • Client was neutral • Concerned only that final drawing product was compliant • No intention of making use of results from data centric approach beyond drawings

20. 3. Modelling summary From client From client From surveyor From client & 3rd Parties Topo Reference Line Alignment From locates and pot-holing 2D μstn InRoads Buried Utilities Track Alignments InRoads InRoads • Plan & profile dgn’s 6 x EEBs Structural/Architectural 6 x EEBs Civil InRoads • Shoring dwgs • Structural drawings • Architectural drawings • Quantities PSDS • Utility relocation drawings • Site plans • Traffic staging drawings • Sedimentation & Erosion Protection dgn’s • Restoration drawings 6 x EEBs Mechanical & Electrical PSDS • Piping dwgs • Electrical dwgs • Mech equipment lists • Electrical equipment lists

21. 3. Modelling summary PCTL “standard set” μstn • General arrangement • Developed plans • Reinforcing dgn’s • Fabrication tolerance dgn’s • Erection sequence dgn’s 3D Parametric model • Check of reinforcement cover & placing tolerance • Check of segment hardware fit • Check of joint plane orientation • Final mock-up ‘print’

22. Project 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+

23. Construction performance • 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

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28. 4. 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)

29. 5. Questions & comments