Skyline’s Brossard, Que., office. Dean has a long-standing,
excellent working relationship with Nucor Skyline and
has partnered with them on many projects within the
region. For this project, the engineering department at
Nucor Skyline consulted on the entire project, providing
drawings and suggesting corner pieces for the job. These
suggestions helped save time and money on the project.
The new wharf was built using approximately 400 net
tonnage of AZ 26-700 steel sheet piles in lengths of 10
to 15 metres, which were manufactured in Luxembourg
by ArcelorMittal. Nucor Skyline often works with
ArcelorMittal on jobs in Canada to supply products from
Europe. The AZ 26-700 sheet piles, which met A690
specifications, were coated with a polyamine epoxy on
both sides to prevent corrosion due to the harsh marine
environment. The coating adds an additional 10 to 20
years of life to the steel sheet piling, giving the AZ 26-700
sheets a life expectancy of 100 years.
As the jobsite is a campground, and there is little room
on land for the equipment, Dean used spud barges for
the equipment and the sheet piles were driven primarily
from the barges. Dean used its own equipment and
the sheets were driven using a combination of a Dawson
hydraulic impact hammer and HPSI 300 and 500 vibratory
hammers.
A 24-metre-long obstruction was encountered on
the southernmost east-west facing wall while driving
the sheet piles. Dean worked quickly with the engineers
at Nucor Skyline to develop a braced tie-back
solution, which prevented any schedule slippage or
standby charges.
Nucor Skyline’s double-channel walers and No. 24
threaded tie-rods completed the connection between
the two sheet pile walls and the sheet piles were
driven to approximately one metre from the existing
wharf perimeter.
Upon completion of the tie-backs, graded, clear stone
was placed in the void between the new wall and the
existing wharf, as well as up to the bottom elevation of
the subsequent concrete work.
Material costs, primarily the foundation of the
new wharf, were 51 per cent of the total job cost.
PROJECT SPOTLIGHT
The coating adds an
additional 10 to 20
years of life to the steel
sheet piling, giving
the AZ 26-700 sheets
a life expectancy
of 100 years.
Spud barges were used to install the sheet piles for the new bulkhead wall
30 Issue 4 2021 www.pilingcanada.ca
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