FEATURE
upper row of anchors extended 40 metres and the lower row of
anchors extended 35 metres from the centerline of the piles.
Similarly, three rows of tiebacks were installed in the
second tangent pile wall: the upper row at 23 degrees, middle
row at 28 degrees and lower row at 32 degrees to horizontal.
A total of 322 anchors were installed in this second tangent
wall. These anchors were spaced 0.5 metres apart, each providing
a design load of 192 kN (43 kip) that supplemented the
design load of about 250 kN (56 kip) provided by the pile wall.
Tying up the job
Doublestar Drilling installed the first tied-back pile wall at
Sunshine Slide between December 2013 and June 2014. The
second tangent wall began in April 2014 and was completed
in April 2015.
During the entire Peace River project, Doublestar drilled
more than 25 linear kilometres to install all piles and anchors.
The installation of the 538 tieback anchors required 21 trucks
with a total of 357 pallets of grout.
Despite the challenging subsurface, access and weather
conditions, both tangent pile walls were constructed without
any safety incidents. All anchors passed the acceptance tests
and post-tensioning criteria. Both lanes of Judah Hill Road
are now open and busy.
This article originally appeared in the July/August 2015 issue
of Deep Foundations magazine, the flagship publication of the
Deep Foundations Institute (www.dfi.org). It is reprinted with
permission.
Soilmec SM-20 rig installing ground
anchors on a sloping hillside
COURTESY OF DOUBLESTAR DRILLING
-
40 Q4 2015 www.pilingcanada.ca
/(www.dfi.org)
/www.pilingcanada.ca
