August 2013
CONSTRUCTION WORLD
36
Using a PERI climbing formwork solution precisely tailored tomeet the
project requirements and reducedmaterial requirements, nine silos
grew steadily upwards in regular two-week cycles. Ready-to-use
elements supplied directly from the PERI formwork assembly hall
ensured dimensional stability.
projects & contracts
RISING 52 MHIGH
into the sky, the recently
completed nine grain silos have significantly
expanded the storage capacity for theMolino
Agugiaro & Figna Collecchio company which
is based near Parma.
The circular silos, with a 7 m inside diam-
eter and 25 cm wall thickness respectively,
are connected to each other and are posi-
tioned on a 5,45 m thick reinforced concrete
foundation. Some 1 350 tons of wheat can be
stored in the silos; a neighbouring building
constructed at the same time houses the new
cleaning and grinding plant which has a daily
production of 30 t.
Reduced on-site material
requirements
In order to maintain the tight eight-month
construction schedule as well as ensuring
optimal building progress, PERI engineers
combined a complete platform level on the
basis of the CB climbing system with the
amount of wall formwork reduced by half.
as a result, rapid and continuous working
operations – reinforcement, forming, concret-
ing – could be achievedwith reduced on-site
material requirements.
The concept, with 16 climbing cycles and
3,25m concreting cycle heights in each case,
took into account that only one crane was
available and could not be worked around
the clock.
The CB climbing system ensures safe
working operations with wall formwork at all
heights. The well thought-out construction
combines easy handling together with a fast
moving procedure and problem-free adap-
tation to suit different building shapes. The
high load-bearing capacity of the brackets
facilitates the use of large scaffolding units –
this saves on time-consuming tie points and
the time required for climbing. With the CB
240 system, the strongbacks are connected
to the brackets by means of a formwork car-
riage mounted on roller bearings together
with a rack and adjustable braces. A retraction
distance of approx. 75 cmcreates anobstacle-
free working area in front of the formwork.
The decking of the CB 160 is only 1,60 m
wide – here, the formwork is tilted, which is
connected bymeans of an adjusting unit and
adjustable braces.
Ready to use pre-assembled
VARIO GT 24 girder wall formwork elements
were used to form the silo walls, and the
formlining for the 3,5 m and 3,75 m internal
and external radii respectively was adapted
to suit the curvatures by means of shaped
timber formers. These were accurately
pre-assembled at the PERI assembly facility
and delivered ready-to-use to the jobsite.
Tight connections were ensured by using
articulated couplings which also meant that
the formwork elements could easily be posi-
tioned. In addition, the site-compliant PERI
implementation planning took into consider-
ation efficient striking procedures within the
constraint points between the silos.
Safe access
Eighty eight CB climbing platforms with CB
160 brackets on the internal and CB 240 on
the external sides formed one complete
working level. Including the finishing plat-
forms on the CB brackets and concreting
scaffolds on the internal formwork, optimum
accessibility and safety was ensured on three
levels. The access and safety concept was
complemented by a steel staircase on the
basis of the PERI UP Rosett Flex modular
scaffolding system. Mounted as a 10-legged
tower, access could quickly be adapted to suit
the construction progress right through to
High quality in continuous
two-week cycles
the final staircase height of almost 40m. Here,
the lightweight individual steps were quickly
mounted on the stringers without requiring
any tools: they interlock during installation
and are immediately secured.
The 1 m step widths of the PERI UP
Rosett Flex Steel stairs together with separate
landings provided site personnel sufficient
space also when simultaneously using the
stairs in both directions. Furthermore, the
stair tower construction is designed for a
high load-bearing capacity of 3 kN/m². Toe
boards on the landings and closed risers reli-
ably prevented any small parts from falling to
the ground.
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