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unispan floor slabs
DESCRIPTION The Unispan flooring system
consists of a series of 75mm
thick precast, prestressed
concrete slabs with a reinforced
concrete topping.This composite
construction allows clear spans
of up to 8.0 metres. SIMPLE Most contractors agree that
Unispan is a simple form of
construction. Slabs are typically
1200mm wide. FLEXIBLE Unispan is easily adapted to any
floor plan and individual slab
widths can be custom made to
suit individual requirements.
Service holes can be allowed for
in the slabs. Please check
with Precast Office
SURFACE FINISH The slabs are cast on a steel
mould and the soffit is flat.This
means that Unispan may be left
untreated, painted or decora-
tively sprayed to match colour
schemes. Painted surfaces
may require a thin plaster coat. SOUND TRANSMISSION A major practical benefit of a
concrete floor is its ability to
reduce noise transmission. Unispan concrete floors are
quiet and do not creak with
temperature and moisture
changes. The table below
shows sound transmission
ratings achieved by Unispan.
CANTILEVERS Cantilevered balconies and decks
can be created by using Unispan
to form the soffit of the slab. TRANSPORT Unispan slabs must be handled
and stacked at two points, by, or
directly beside, the lifting eyes. ERECTION It is recommended that Unispan
slabs be seated 75mm onto the
supporting walls/beams and
bedded on wet mortar or plastic
bearing strips to ensure an even
bearing at the correct level.
Unispan floor to
enable rapid
construction and a
quick usable floor
area.
UNISPAN LOAD/SPAN TABLE (indicative only) Safe, superimposed live load in kilopascals (kPa) for various topping thicknesses (assuming no superimposed dead load, i.e. SDL=0kPa).
Span (m) 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
65mm topping 17.0 13.0 9.0 7.0 5.5 3.5
75mm topping
15.0 11.0 8.0 6.0 4.0
3.0
90mm topping 14.0 10.0 7.5 6.0 4.5 3.5
110mm topping
10.0 7.0 6.0
3.0 2.0
4.0
130mm topping 9.0 8.0 6.0 4.0 3.0
Spans to the right of the bold (zig zagged) line exceed the maximum recommended span/overall depth ratio of 44. For spans exceeding this value, please check with Precast Office.
UNISPAN SECTION PROPERTIES Section properties are based on a 1200mm wide section of floor. The modular ratio for topping concrete is assumed to be 0.71 for 20MPa concrete for calculating the composite section properties A, Yb, I, Zb, and Zt. Area x10
3 mm
2 Yb mm Ix109 mm
4 Zbx106 mm
3 Ztx106 mm
3 1200mm wide mass kg/m weight kPa Bare unit 90 37.5 0.042 1.12 1.12 230 1.88
With 65mm topping 145 64 0.230 3.61 3.03 430 3.51
With 75mm topping 154 68 0.283 4.15 3.44 461 3.77
With 90mm topping 167 75 0.377 5.02 4.18 507 4.14 With 110mm topping 184 84 0.532 6.31 5.25 568 4.64
With 130mm topping 201 94 0.723 7.72 6.54 629 5.15
Unispan floors were
used along with
precast Shell Beams. A
lap pool, lagoon pool,
spa, gym and sauna
TYPICAL UNISPAN
SEATING DETAILS
ON BLOCK WALLS
AND STEEL BEAMS
unispan FIRE RESISTANCE RATING Standard Unispan can
provide up to a 1.5 hour FRR. MATERIALS Unispan slab strength = 40
MPa at 28 days. Topping = 20 MPa at 28
days (as required by NZS
3101:1995).
FURTHER TECHNICAL INFORMATION Specifications for the
manufacture, transport and
erection of Unispan, and standard
details for typical situations, are
available from our Precast Office
Experienced and qualified staff
will be pleased to discuss design
and fixing details.
Concrete Solutions (Fiji) Ltd Phone: +(679) 336 4169
Fax: +(679) 336 4175
Mobile: +(679) 9929224
Web:
www.concretesolutionsfiji.com