2023 Summer Issue of Urban Land - 98
SOLUTION FILE
Top-Down Construction
CHUCK SCHILKE
Structural engineering
solution reduces costs and
embodied carbon.
Top-down consTrucTion-
constructing floors at ground
level, then raising them to
the top of the building and
then successively downward-
potentially offers an attractive
alternative to conventional
construction, with its costly,
labor-intensive, and environmentally
wasteful process of
building steel frames, floors,
walls, and all components of a
building at height. But adoption
of an advanced form of
top-down construction has not
become widespread.
With recent refinements,
however, top-down construction
has become a much more
practical option. Under current
commercial real estate business
conditions-namely, soaring
construction costs, labor
scarcity, and environmental
degradation-the cost savings,
labor reduction, and enhanced
sustainability of this approach
have become even more compelling
for the commercial real
estate industry.
Architect's conception, eVolve
Towers, north view, Denver,
Colorado, currently under
development by Ubuntu Partners.
Top-down construction involves the
construction of individual floors
at ground level by tradespeople,
then raising successive constructed
floors by hydraulic heavy-duty
jacks starting at the top floor of the
building and going floor by floor
to the lowest floor. The two-tower
apartment complex is TGE Top
Down's first top-down project in
the United States, after completing
two laboratory/office towers in
Bangalore, India.
The Termohlen-Thornton
Concept
The Termohlen-Thornton
method was invented in 1973
when the now-retired founder
and former chairman of the
renowned Thornton Tomasetti
structural engineering firm,
Charles H. Thornton, joined
forces with " suspended building
construction " top-down
construction system inventor
David Termohlen. Thornton
quickly became a convert
to the virtues of the Termohlen-patented
method after
completion of half a dozen
buildings using top-down
construction.
Widespread adoption of
the Termohlen-Thornton topdown
construction method
was delayed until Thornton
retired as chairman of Thornton
Tomasetti in 2004 and
founded TGE Top Down with
Jeff Grillo, an owner's executive,
and Dan Esparza, a con98
URBAN
LAND
SUMMER 2023
D AN ESP ARZA
2023 Summer Issue of Urban Land
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