At the downtown Chicago Social Security Ad‑
ministration building, a new playground with
low, curving concrete walls was designed as
part of the Harold Washington Center. When
PerDel Construction received the subcontract
from F.H. Paschen Construction for this project,
Per Del called on Symons® by Dayton Superior
to help them create a plan for the pours.
There were several important considerations
for this project. There were a variety of curves
in the design, and the contractor was con‑
cerned about wasting a lot of time building
templates and making formwork adjustments
between pours. The plans also specified a
smooth architectural finish without “chord‑
ing”, and they did not want to spend a lot
of time grinding and finishing the surface to
meet this requirement.
When PerDel accepted the proposal, Symons
engineers produced plans and drawings for
building the walls in eight pours. The plans
utilized standard ribs wherever possible, and
custom rib configurations, including the tight
“return wall”, only where needed. This saved
the contractor money, since they were able to
rent almost all of the equipment necessary to
complete the project.
PerDel Construction was impressed with the
detailed plans and the equipment they re‑
ceived. They reported that the project went
smoothly, and the walls looked terrific.