POWER July 2010 - 22

6. Flexible towers. A load-bearing tower, Staxo 100, was chosen because it could deliver
high load capacity; was adaptable to different layouts, floor shapes, and loads; and included
integrated safety features. Courtesy: Doka USA
7. Safe and secure concrete pours.
Safety was a key concern with the height of
this project. Safe access at any location anywhere
within the tower using the first built-in
ladder and OSHA-approved tie-off points was
a selling point for the contractor. Courtesy:
Doka USA
tion. The $2.6 billion project is expected to
enter commercial service in 2012.
The contractor for Edwardsport is F.A
Wilhelm Construction. Wilhelm has responsibility
for the site construction, including
forming and pouring major foundations
and other structures on the project. Wilhelm
is also responsible for ensuring a
safe and productive job site for the hundreds
of workers focused on constructing
the plant. Wilhelm carefully considered alternative
formwork suppliers for a complex
125-foot by 40-foot by 9.5-foot-thick slab
weighing more than 4.8 million pounds.
Wilhelm selected Doka USA because it was
able to deliver the formwork on a tight
schedule with a fast set and cycle time,
and the company had safe and easy-to-use
products (Figure 6).
Supporting High, Heavy Loads
Doka USA used Staxo 100 high-load-bearing
towers to support the massive concrete
pour along with Dokamatic tables
to form the 5,600-square foot slab. This
particular formwork system was chosen
because it could deliver high load capacity;
was adaptable to different layouts,
floor shapes, and loads; and included integrated
safety features. The Staxo 100
load-bearing tower is made of sturdy
galvanized steel frames and provides an
optimal load capacity of up to 90 kip per
tower (Figure 7).
Safety was a key concern given the
height of this project. Safe access at any
location anywhere within the tower was
possible by using the first built-in lad22
der
and Occupational Safety and Health
Administration (OSHA)-approved tie-off
points. These safety features were a strong
selling point for the contractor.
Wilhelm's crew found the shoring system
provided quick and easy assembly:
Because it used integrated couplers, there
were no loose parts. Crews could easily
assemble and disassemble the structures.
Safety was carefully designed into
the erection sequence, as the crew was
able to use the integrated ladder and tieoff
points that are directly built into the
frames. On this project, all three heights
of Staxo 100 were used; 3-, 4-, and 6-foot
heights.
" We found the system went up easily
and quickly. It poured as solid as anything
we've ever done. Using this system helped
us beat our estimate on Duke's power
plant, " said Curtis Arnold, project superintendent
for Wilhelm.
Integrating the Table Slab Formwork
The next step was delivery of the tables
needed to pour the slab. The Dokamatic
tables arrived on site preassembled, saving
time and resources, and were set on
top of the Staxo shoring system to create
a 123.5-foot-long, 40-foot-wide slab area
where the concrete would be poured.
Using Dokamatic tables saved on labor
and crane time, because the system is
optimized for minimal forming times on
large deck projects. Fully assembled table
form units quickly position into place and
eliminate the need for labor-intensive carrying
of individual components from one
www.powermag.com
location to the next. The Dokamatic tables
allow for quicker cycle time and are ideal
for fast formwork handling when casting
large floor slabs (Figure 8).
Using a simple pin connection, Staxo
100 connects directly to the steel stringer
of the table unit and allows flying of a
large deck formwork section in combination
with the Staxo 100 shoring system.
The combination of the Staxo 100 shoring
system and Dokamatic table slab formwork
allowed 90% of the work to be performed
on the ground at a safe level and then
lifted into place by a crane. ■
-Contributed by Doka USA.
POWER | July 2010
8. Overhead concrete pour. The
contractor chose to use the Staxo 100 highload-bearing
tower to support the 4.8 million
pounds of concrete and steel, along with
Dokamatic tables to form the 5,600-squarefoot
slab. Courtesy: Doka USA

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POWER July 2010

Table of Contents for the Digital Edition of POWER July 2010