drilling the rock sockets, this containment was done through
reverse circulation.
“Water was pumped into the pile from the outside, while
air was pumped through the drill-string to the base of the
rotary bit,” Reinders explained. “This pressurized the bottom
of the pile, causing water, air and cuttings to flow up through
a cavity in the drill-string and out through a discharge
hose. The hose directed the cuttings to the landside of the
combi-wall where they were later excavated and disposed.”
Drilling tiebacks proved to be a big challenge as well. The
tiebacks were 24 metres of overburden and then a six-metre
rock socket, and had to be drilled on a 42-degree angle
towards the land.
“This required the tieback rig to be placed on a barge and
drill the tiebacks off water,” said Reinders. “The barge used
gravity spuds to help anchor it in place, but it was still buffeted
by waves. With ideal conditions, we achieved four
tiebacks drilled and placed within a 10-hour day.”
The pile driving equipment used on this project included
the following:
• 165-ton crane with an HPSI 500 to drive the majority of
the combi-wall.
• 110-ton crane was fitted with an extended crane-mounted
vertical drill to remove the overburden from within the piles.
• 165-ton crane was fitted with one of Bermingham’s customized
rock drilling systems. This system included 30
metres of L27 vertical travel leads (VTL); HHH-16 spotter;
a lead mount hydraulic crowd; and a BHD-80 reverse circulation
drill. This drill turned 21 metres of 460-millimetre
drill string with a 20-millimetre rotary drill bit. All of this
PROJECT SPOTLIGHT
equipment was produced in-house by Bermingham’s
manufacturing division.
• A tieback rig drilled the anchors off of a gravity spud barge
and was serviced by a 165 crane.
Several companies provided the equipment and materials
used in this project.
Skyline Steel provided all of the piling, which included:
• 98 pipe piles, 1.1 metre in diameter, ranging between up
to 18 metres long. Skyline also provided the sheet pile
connectors that Bermingham’s manufacturing division
welded to all 98 piles.
• 79 pairs of AZ14-770 sheets that laced between the piles.
• 13 pairs of AZ46-700N sheets that were used as a deadman
wall to support the end of the combi-wall.
• 107 metres of 53-millimetre threaded bar to span between
the deadman wall and the end of the combi-wall.
ConTech Systems provided all of the tieback material.
This included:
• 80 anchors, 14 strands each, 33 metres in length. The top
27 metres was double-corrosion protected.
• Bearing plates, cover caps and grease.
Anchor Rebar provided the rebar cages that tie the piles
into the concrete cap.
OPA’s Taylor added that the Port of Oshawa will now be
truly intermodal and able to move cargo of all sizes year round.
“The port will see greater productivity and time and cost
savings since manpower and equipment will not need to be
split between two sides of the harbour. This will be beneficial
to port customers by minimizing labour downtown and wear
and tear on equipment. That’s a huge advantage.”
HOT ROLLED THREAD BAR
CTS® (HRTB)
Made in the USA
NEw! Variety of Sizes up to 3”
Micropiles / Anchors / Soil Nails / Reinforcing Bars
Including Corrosion Protection
Also available: CTS® TITAN/IBO® Hollow Bars, Strand Anchors
www.contechsystems.com T oll-free: 1-888-818-4826
The registered trademark is owned by Con-Tech Systems Ltd. and the registered trade-mark Ischebeck Titan® is owned by Friedrich Ischebeck GMBH and is used under license.
PILING CANADA 39
/www.contechsystems.com
