May 18-May 31, 2016 —
COLORADO REAL ESTATE JOURNAL
— Page 33
Construction, Design & Engineering
said Soell. “But this option elimi-
nates any long-term operational
costs associated with permanent
groundwater treatment and dis-
charge. Additional coordination
with waterproofing specialists,
as well as shoring subcontrac-
tors, is also critical when devel-
oping this type of system.”
Proper Crane Planning
Unlike suburban develop-
ment, space utilization is a con-
stant concern for urban develop-
ers. That’s why proper urban
infill planning takes into account
the placement of the construc-
tion crane within the building
so that redesign of the structur-
al and shoring systems, which
add construction costs and time
delays, will not be necessary.
“We’ve learned over the years
that some teams give little
thought to the location of the
crane until the project design
is well advanced,” said Soell.
“While it’s pretty easy to leave
out an interior section of steel
floor to accommodate a tower
crane, temporary crane open-
ings, on the other hand, greatly
affect the design and cost of
post-tensioned concrete slabs.”
Additionally, there can be chal-
lenges associated with obtaining
temporary airspace use agree-
ments over adjacent properties.
Failure to plan for and prefera-
bly limit temporary tower crane
intrusion over your neighbors’
properties could delay construc-
tion and lead to additional pre-
construction coordination and
legal costs.
“For a recent project in down-
town Boulder, it was actually
a question of geometry,” said
John Wyatt, project manager for
Wyatt Construction. “There was
really no place to put a tower
crane big enough to reach every-
thing without hitting the nine-
story building next door.”
According to Soell, if the proj-
ect can’t accommodate a tower
crane, then a crawler crane must
be placed on grade adjacent to
the line of shoring in a tempo-
rary easement within the right
of way, as was the case with
W.W. Reynolds’ Wencel Build-
ing. In this case, the temporary
shoring must be designed for
the crawler’s additional super-
imposed surcharge load. And
failure to do so could result in
even more costs to reinforce the
shoring system during construc-
tion, or even worse, it could
cause shoring damage and even
failure.
In the conclusion of this two-
part article, we will look at chal-
lenges with site utilities and the
ever-evolving energy-efficiency
code requirements facing urban
infill developments.
s
Infill
venience for our passengers.”
Perkins Eastman is the
design architect and SEH is
the architect of record for the
project.
Plans for the Civic Center
Station renovation began in
2011, with a report by Merrick
& Co. that surveyed the facil-
ity and made recommenda-
tions. During that process, it
was determined that the cost
for repairing and keeping the
same design were comparable
to redesigning and building a
new facility.
Construction is expected to
begin this summer and will
take approximately 12 months
to be completed.
s
Mortenson
which overhangs the north
and south ends of the build-
ing. “The suspended ceiling is a
combination of slotted channel
framing, traditional wire-hung
tee framing and cold-formed
steel framing supporting glass-
fiber-reinforced gypsum shapes,
gypsum board and custom fab-
ricated aluminum extrusions
and fittings,” said Russ Leffler
of The Leffler Group. The bar-
rel-vault facets were created by
using the structural steel diagrid
canopy spring points located on
the floor below, the ceiling ridge
point, and the centerline to cen-
terline facet dimensions. From
this information we determined
the swing angles between facets,
which in turn defined the geom-
etry of the break metal reveals,
and triangular GFRG pieces.”
In addition to the sky lobby
ceiling at the Westin Hotel at
DIA, the company has com-
pleted other signature local
projects such as the “Jurassic
Leaves” light-rail canopy at the
Louisiana/Interstate 25 station,
Prowers Medical Center ER and
OR addition in Lamar, the Gar-
dens on Havana Retail Center
in Aurora, Palazzo Verdi Office
building in Greenwood Village
and Premier Lofts in downtown
Denver.
s
Leffler
