CONCRETE
The normal de-tensioning procedure was used, but workers reported that more oxygen was
needed in the gas mixture to flame-cut the stainless steel strand than carbon steel strand
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•• The stainless steel preformed tie wire
required more effort, and therefore
more time, than the comparable carbon
steel tie wire when tying the spirals to
the strand, according to Dusty Carver,
GCP superintendent.
Controlling material costs
during production
Material costs were a special concern during
production because of the use of stainless
steel. Stainless steel is more expensive
than carbon steel, and, more importantly,
the long lead times for orders of stainless
steel materials meant that a shortage
of any of the stainless steel items could
have severe consequences for the schedule.
Care was therefore taken to ensure
that the quantities of stainless steel strand
and spiral wire ordered were sufficient to
allow for the possible remake of a pile.
Also, strand used for the lift loops for the
initial casting of piles needed to be cut
from the virgin strand packs. Thereafter,
the leftover strand at the dead and live
ends of the beds could be used for the
lift loops.
Specific material handling and inventory
control procedures were adopted for
the precious stainless steel preformed tie
wires. According to Ben Spruill, vice president
at GCP, these measures were so successful
that they may become standard
practices at the plant for other items.
Summary
The production process for precast concrete
piles prestressed with stainless steel strand
was not markedly different from that using
conventional carbon steel strand.
PILEDRIVER | 97
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