The utilization of SPIN FIN® pile tips
as opposed to rock anchors for these
piles saved the CBJ several millions
of dollars on the project cost.
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bedrock, the dolphins were designed with
seven, all vertical 48-inch-diameter piles
in order to increase the stiffness response
of the dolphin and the pontoon that was
moored to the dolphin.
Problems and creative solutions
The fjord-like geography presented an
overall challenge for the design and construction
of the project. In localized areas,
piles needed to be seated into exposed bedrock
without the benefit of lateral support
and stabilization from the surrounding
overburden. In response, Manson developed
a braced frame and steel shroud they
could install near the pile tip and bedrock
surface in order to stabilize the pile
and allow initial seating and subsequent
socket drilling.
Of the 179 piles installed for the project,
the underwater frame was necessary for
six of those piles.
Cost saving measures
With the large ship loading on the pontoon
dolphins, mooring dolphins and breasting
dolphins, the magnitude of the tension and
compression loads on the driven piles was
very large. The compression capacity of the
piles could be easily achieved by the end
bearing capacity of the piles driven into
underlying bedrock. However, the design
team needed creative solutions in order
to safely resist the tension demands on
the piles. To resist these loads PND used
SPIN FIN® pile tips. The pile tips are
comprised of a series of straight steel plates
welded to the tip of the steel pipe pile in a
helical configuration.
Once pile driving is complete, the pile
is securely welded to the superstructure and
the pile is prevented from rotation. Since
this rotation is loaded, the soil bearing on
the face of the SPIN FIN® tip plates provides
increased uplift resistance so the tension
forces are resisted both through skin
friction and the bearing area of the plates.
In total, the Juneau Cruise Ship Berths
used 57 SPIN FIN® tip piles. The utilization
of SPIN FIN® pile tips as opposed to
rock anchors for these piles saved the CBJ
several millions of dollars on the project cost.
The Juneau Cruise Ship Berths project
is the largest in Alaska state history, overshadowing
even the other cruise ship berths
just south of these new facilities. The new
berths are capable of servicing the largest
class vessels that are slated to visit Southeast
Alaska, including the Breakaway class vessel
which has an overall length of 1,063 feet and
a gross tonnage of 144,000 tons.
PND’s utilization of the PDA testing
system on this project was featured in Q3
2016, of PileDriver magazine. t
PND Engineers, Inc. won a 2017 PDCA
Project of the Year Award in the Associate/
Engineering Affiliate category.
PILEDRIVER | 105
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