Construction Today - December 2017 - 26

Three in One
Coordinating the interior demolition work and the design of the
diagrid floors was challenging for the project team. L&L is regularly meeting with Tishman, the structural steel and concrete contractors, building engineers and a specialty structural engineering
firm to coordinate the sequencing of the interior demolition. "The
whole team is working on this together because we have to do
this in the right order; if not, we can cause damage to the existing
building," Potts says. "It took a long time to make sure we were
doing this properly."
The 26th story Club Floor and 27th story mechanical mezzanine are required by code to be reinforced by additional bolts
and welding. "These floors have been more difficult than we
expected," Potts adds. "We can't add steel on any of those floors
until certain things are completed."
Constructing the 26th and 27th floors involves a 15-stage process that includes the placement of solid steel nodes on structural
columns. The nodes, which are 18 inches thick, 20 feet long and
weigh 100,000 pounds each, are being manufactured in Pittsburgh. After that, the nodes will be sent to South Carolina, where
they will be welded together. Ultimately, the nodes will be welded
to the columns. "The nodes have to be welded together perfectly
because they are clad in stainless steel. They have to be surveyed
constantly to make sure we're inside tolerance," Potts says.
"Structurally, this project is very difficult," he adds. "It's almost
like having three different structures in one - the base, midrise
and diagrid floors are all different and react differently. We have
to monitor how the building is reacting to the weight of these
structures before we install the curtainwall."

Working WELL
Both the 390 Madison Ave. and 425 Park Ave. buildings are projected to attain LEED Gold certification. Green building elements
in both buildings include the use of energy-efficient lighting,
fixtures and mechanical equipment.
Although Potts notes that such materials are commonplace in
L&L Holding Co.'s projects, the 425 Park project will take it a step
further when it comes to green building. The building is project-

26

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Table of Contents for the Digital Edition of Construction Today - December 2017

Contents
Construction Today - December 2017 - Cover1
Construction Today - December 2017 - Cover2
Construction Today - December 2017 - 1
Construction Today - December 2017 - Contents
Construction Today - December 2017 - 3
Construction Today - December 2017 - 4
Construction Today - December 2017 - 5
Construction Today - December 2017 - 6
Construction Today - December 2017 - 7
Construction Today - December 2017 - 8
Construction Today - December 2017 - 9
Construction Today - December 2017 - 10
Construction Today - December 2017 - 11
Construction Today - December 2017 - 12
Construction Today - December 2017 - 13
Construction Today - December 2017 - 14
Construction Today - December 2017 - 15
Construction Today - December 2017 - 16
Construction Today - December 2017 - 17
Construction Today - December 2017 - 18
Construction Today - December 2017 - 19
Construction Today - December 2017 - 20
Construction Today - December 2017 - 21
Construction Today - December 2017 - 22
Construction Today - December 2017 - 23
Construction Today - December 2017 - 24
Construction Today - December 2017 - 25
Construction Today - December 2017 - 26
Construction Today - December 2017 - 27
Construction Today - December 2017 - 28
Construction Today - December 2017 - 29
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Construction Today - December 2017 - 47
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Construction Today - December 2017 - 112
Construction Today - December 2017 - Cover3
Construction Today - December 2017 - Cover4
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