Presentation outline

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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

gTTC subway lines

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.

g2. Specific design challenges

a) Precast tunnel linings

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

g2. Specific design challenges

b) Emergency exits

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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

g2. Specific design challenges

c) Pipe and conduit routing

(a classic 3D problem)

gFire line connection

How do you ensure the train won’t hit the pipe?

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

gRecent photos

gRecent photos

gRecent photos

gRecent photos

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)

g5. Questions & comments