bathurst st and king st w ttc track allowance reconstruction
TRANSCRIPT
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