bathurst st and king st w ttc track allowance reconstruction

Contract No. 11 TSP 07 RD JULY 2011

TTC initiated Last reconstructed in 1995 by former

Metro over two 4 day weekends (Gazzola Paving)

Unique location because this is one of only

three grand unions This time it included additional work at car

stops and additional underground work such as conduits and drains for switches

Castings came from Nortrak in Vancouver (ordered the year before)

Design and surveys by TTC and City staff Panels put together in TTC yard prior to

work commencing over a 7 week period by 12 labourers

Contract preparation and tendering…

76 separate work items $1,348,000. dollars of contract work Additional TTC costs are on top of this for a

total cost in order of 5 Million dollars Timelines – 15 day full closure one week

partially back open and then one more week closure

Additional time provides for better quality, separation of TTC and Contractor workforces and need for additional underground work

Meetings Layouts Stakeouts Notifications, letters and signage Inspection of buildings for pre existing

damage Submission and review of mix designs, and

traffic management plan Coordination of TTC and Contractor hourly

schedule

City include designers, transportation staff, surveyors, inspectors, PE, CA staff and City hired material testing consultant etc

TTC engineers, designers, surveyors and construction crews

Contractor, and subs for electrical work and vibration monitoring and pre inspection etc

Closure commenced one leg at a time but start from the centre working out

Contractor worked saw cutting, torch cutting, breaking and then excavation of TTC Track Allowance from 7 am to 10 pm

Vibration monitoring done during breaking of concrete

Sewer connections made for drains Noise complaints received

Traffic management

Excavation, continues and conduit installation commences from 7 am to midnight.

TTC has delivered panels to site Large amount of steel rails seemed to

slow down the excavation in the centre of the intersection

Why did the Traffic lights stopped working?

Caution wires!

Traffic conduits

Excavation continues, long wooden ties and monolithic concrete encountered in TTC T/A

Overhead wires broken during excavation Concrete placed for the first time for

foundation slab in “Diamond Area” of TTC T/A

TTC able to work for the first time so far Contractor installed some more conduits

and catch basins Contractor worked 6 am to midnight

P.E.M.S

TTC now has crews working day and night

Contractor has 15 staff working on site continuing to excavate, place concrete for foundation slab, drain connections for switch drains and trench restoration for conduits installed in the roadway

Box outs

Excavation substantially completed Concrete for the foundation slab also

substantially completed Placement of new “diamond area”

completed and locked in with infill concrete

Contractor worked 7 am to 10 pm TTC working day and night

The contractor’s sub contractor worked on Saturday to install conduits

TTC worked Saturday and Sunday

Concrete pump on site $300.00+ per hour

Placement of infill and surface layer commenced. 276m3 of concrete placed

Contractor placing concrete in surface area and working from 7 am to 10 pm

Bond breaker placed between infill and surface lift. WHY?

Handwells and conduits installed

Note the trowel

New composite hand wells

Contractor placed 196,130, 125,120 m3 concrete per day for infill and surface layers of TTC T/A working 12 hr days and on one day it reached 37 C

Conduit work continued. 24 hr concrete test results of 7 day concrete

mix = 25,24.9 & 31.1 Mpa Davroc and CBM concrete testing technicians

on site every day Special attention was paid to concrete curing

On Saturday they completed conduit and wiring for traffic signals

Sunday was for concrete curing Monday they installed gutter brick,

cleaned the rails and worked on other items to prepare the site for paving on Tuesday

Paving completed by sub contractor, Gazzola Paving, working 7 am to 8 pm

210 mg of HL1 asphalt placed Routing and sealing and line markings

completed immediately afterwards for road opening 5 am Wednesday July 26, 2011

Routing and sealing

Back open for traffic in all directions

Platforms

Tight and rigid timelines Weather, high temperatures and risk of

thinder storms Concrete quality issues TTC and contractor coordination issues TTC delays due to insufficient manpower

signing up for overtime weekend work

Shallow utilities such as traffic conduits and buried MH

Utility chambers found to be in need repair Monolithic concrete, long and stacked ties Last minute design changes by TTC Utilities in conflict with proposed drain

connections to sewers Confined area limited access

Noise Dust Moving equipment and construction

traffic Distraction from multiple activities Open excavations Broken Utilities Sun and heat Tripping hazards – one injury

More conduit and drain installations Panels of track used which increase

quality Welded rails, Track encapsulated with

rubber and more steel ties are used which increase what?

Greater separation of time and space between TTC forces and Contractor. What is the benefit of this?

• Media inquiries / questions• TTC Electrical discontinued HWs• Adjust the signals on the affected adjacent streets

during full closures• Short anchor bolts for TTC shelters at the platforms• Zebra marking to be included during design• TTC overhead wires damage• Ancillary costs for TTC priority loops / traffic signals

and loops and shelters as part of PO• Utility Meeting at the design Phase• Wiring the flashing beacon on the median platform• Electrical ground plate and ESA certification