Crane mount drilling beside Massey Hall’s existing foundations Tieback drill installing tiebacks below the future temp
quickly once the initial excavation was done and prior to the
bridge being in place to avoid interference.
Meanwhile, the shoring piles at Heintzman Hall and the
CIBC building had to be drilled from a lower elevation to
accommodate the existing footings. This work took place
at the far end of the site and access for concrete deliveries
was blocked by the excavation and tiebacks being installed
in the middle of the jobsite. It was necessary to complete
this drilling and demobilize the drill rig before the bridge
was in place, as the drill would not fit below the temporary
bridge once installed. deep was able to accommodate
longer shifts and weekend work in order to complete this
stage of the foundation work on schedule to ensure the
next stage of work on the Massey Hall and Tower projects
could continue.
Excavating for the tiebacks and walkway in the middle
of the site meant no access for concrete trucks to pour the
secant wall in the southwest. Having all these activities
occurring at the same time in such a congested area would
have been a daunting endeavor for most companies. deep
organized a 170-foot concrete pump to reach over the excavated
jobsite from the Victoria Street entrance to pour the
secant wall in the opposite corner near Yonge Street. The
concrete pump solved one problem, but it also occupied the
entire main entrance, blocking access for any deliveries. All
activities had to be carefully scheduled and orchestrated for
the work plan to be executed without disruption to any of
the activities.
PROJECT SPOTLIGHT
bridge, track drill installing shoring along Heintzmann,
concrete pump reaches over the site to pour
Once the temporary bridge was in place, access to the
Massey Tower project was limited by the reduced headroom
below the bridge. Nonetheless, the excavation proceeded
beneath the bridge and deep’s tieback drill had to squeeze
beneath the bridge to access the tiebacks for Massey Tower.
Meanwhile, the vertical drilling for shoring and caissons at
Massey Hall was already underway.
Protecting Massey Hall’s historic foundation
Just to the south of Massey Hall, the Prince Albert Building
had been recently demolished, but its foundation walls and
basement floor slab had to remain in place, connected to the
Massey Hall structure, until the adjacent secant walls were
installed. Heavy equipment was not allowed to enter within
the footprint of the Prince Albert Building so as to not disturb
Massey Hall’s existing foundation. To install the east and
west shoring walls, deep used a Calweld crane-mounted drill,
positioning the tracks outside the zone of influence and drilling
right beside Massey Hall from over 20 feet away.
On completion of the street level drilling, the site was
excavated 13 feet to the elevation of the existing footings of
Massey Hall. The remaining Prince Albert Building foundations
were saw-cut and removed. From this platform, the
remaining shoring walls were drilled along the north and
south of the site. The lowered platform provided a tight
squeeze for deep’s drill rig to fit below the overhead ductwork
along the exterior of Massey Hall. The Watson 3110 trackmounted
rig was chosen to be short enough to fit below the
PILING CANADA 53