Liberty Bowl Score Board
Situation: FedEx CEO Fred Smith donated 2.5 million dollars to the University of
Memphis to cover the cost of a new high-definition video board in the
Liberty Bowl Memorial Stadium's south end zone. The new 100-by-50
ft. board will be the fifth-biggest in the country(1). Due to the new
(sail) height, engineers on the project called for  four drilled shafts
to 40 ft. filled with concrete to support steel I-beam columns. After
the outer two piles were installed they realized that during the due diligence
phase of the project, the engineers missed a field of utilities; gas,
water and electricity directly beneath and smack dab in the way of the
remaining two pile locations. Additionally space constraints demanded
they look elsewhere for a solution.
Solution: Move the remaining two piles to a location between the structure and
Stadium using helicals.
Conclusion: Patton Taylor Ent. (GC) called Michael Seebeck in to access the situation
and design an alternate solution that would allow the project to continue
on schedule and budget. With support from Darin Willis and Ram Jack Distribution,
two  foundation support pads were designed to support a 200 kip vertical
load (tension and compression). The 200k VL will be transferred from an
existing steel scoreboard column support by a W 12 x 65 wide flange beam
that will extend outward at a downward diagonal direction and be braced
back into the existing steel scoreboard column support. The foundation
support pads will consist of concrete caps that will be securely anchored
to the ground with  seven 2 7/8 inch diameter Ram Jack helical piers.
Loads will be transferred from the concrete caps to the helical piers
by Ram Jack new construction brackets. The new concrete caps have a minimum
thickness of 3 ft. 6 inches and will be reinforced with two mats of steel
consisting of fourteen #6 rebar extending in both directions. These rebar
mats will be located at the top and the bottom of the new concrete caps.
The caps were designed by Joseph John Chappo (TN registration).
Helical piers were designed by Ram Jack engineers utilizing information
from boring logs supplied by Geotechnical engineers. Ram Jacks’
Computer Aided pile design software recommend a double helical 8 –
10 configuration which also meets ICC-ES ESR 1854.
Seven helical piers were installed at each foundation support pad using
a 7k torque motor fluid power provided by a yanmar backhoe. New construction
brackets were attached to the helical piers by 7/8” diameter grade
8 bolts. These over-sized bolts were required due to tension requirements.
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