2023 Summer Issue of Urban Land - 99

tractor and veteran industry
entrepreneur. Often confused
with lift slab construction-
which infamously caused the
collapse of L'Ambiance Plaza
in Bridgeport, Connecticut, in
1987, killing 28 construction
workers-the advanced Thornton
top-down method is completely
unrelated.
The result of 45 years of
research, TGE's construction
process comprises the following
key elements:
Central cores/spines to
support the top-down construction,
including elevators,
stairwells, and major utilities,
are erected first.
Tradespeople construct each
floor, including everything that
will be located on that floor, at
no more than six feet (1.8 m)
above ground level.
Heavy-duty hydraulic jacks,
staged on the ground with a
pulley system at the top of
the cores, spaced out at relatively
few intervals beneath the
periphery of each respective
floor, raise the completed floor
to the level where it is to be
attached to the core.
At the same time as the
jacks raise each floor, tradespeople
construct the next
floor, including everything that
will be located on the floor, to
save time, which can be done
safely because of redundancies
built into the jacks.
Extremely strong steel bars
retracted into the initially
erected cores are pushed
out from the cores and then
inserted into holes at the
periphery of each floor to
provide the structural support
for each, and then bolted into
place as permanent supports
for that cantilevered floor.
This process is repeated for
each floor until all of the floors
are in place.
The jacks pictured here operate by
means of cables anchored parallel
to the cores at ground level, which
pass over pulleys anchored to the
tops of the cores. Each floor is
slowly raised to its correct position
by hydraulic action of the jacks
over a period of hours.
SUMMER 2023
URBAN LAND
99
PROACTIVE
D AN ESP ARZA

2023 Summer Issue of Urban Land

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