Speedfloor is a unique
and innovative
suspended concrete
flooring system
combining a light
gauge roll formed
steel joist compositely
with an in-situ
concrete topping to
form a material
efficient and cost
effective concrete
floor.
Welcome
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The System
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▪ The Speedfloor joist and
the formwork system
was designed and
exhaustively tested in
New Zealand before its
introduction into
Australia and then the
global market place.
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▪ At the heart of the system is a
rollformed, galvanised steel joist.
▪ The joist is manufactured from
pre-galvansied, high tensile steel
in a rollformer where in a single
integrated operation, it is
rollformed, punched, pressed,
pre-cambered and cut to length at
a fast production rate.
The Joist
▪ The end-pieces are simply
bolted to the joists which
are then ready to ship.
Ready to go
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▪ They can be palletized,
containerised or loaded
onto transport for direct
delivery to site.
▪ The individually marked
joists, strapped in bundles,
are lifted onto the support
medium where they can
safely remain until required.
On site
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On site
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• The joists are then
spread manually and
locked into their final
positions with use of
lockbars.
• Plywood forms are
introduced from the top
to form the slab
shuttering system.
▪ The reinforcement is
now ready to place.
▪ The top section of
the joist supports the
reinforcement and
becomes embedded
in the concrete topping
for composite action.
Ready for reinforcement
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▪ The cam action of the
lockbar tightens the ply
formwork against the Joist
giving a clean and generally
slurry free joint meaning little
or no cleanup is required.
Ready for reinforcement
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▪ 3 days after the concrete is
poured the shutter system
is removed revealing a
clean fresh suspended
concrete floor.
▪ Services can pass through
the pre-punched holes and
the bottom of the joist can
support a suspended
ceiling fixed to the joist.
The end result
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How it works - The Joist
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▪ It is the compression element of the non-
composite joist during construction
▪ It is the chair or stool that supports the
wire mesh or the reinforcement that
develops negative moment capacity in the
concrete slab over the joist
▪ It locks in and supports the slab shuttering
system (lockbars and plywood forms)
▪ It becomes a continuous shear connector
for the composite system.
The top section of the joist that becomes embedded into the
concrete slab has 4 functions :
How it works - The Joist
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▪ The mid section or web of the joists has the
flanged service hole and the lockbar hole
punched into it
▪ The flanging of the service hole provides
stability to the web and services can pass
thru without requiring protection from the
sharp edges of the punched material
▪ The 60mm by 25mm diameter lockbar
holes are punched at 150mm centres to
receive the lockbars and afford evenly
distributed support for the plywood
How it works - The Joist
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▪ The bottom triangular section of the joist acts as a
tension member both during the construction phase
and when the joist is acting compositely with the slab.
▪ The lockbars support the temporary plywood formwork between the
joists during construction. They are spaced approximately 300mm
apart and engage in the slotted holes punched in the top section of
the joist. They also maintain the exact spacing of the joist
How it works - The Lockbar
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How it works - The Lockbar
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▪ The standard lockbars when installed will position the joists
1230mm, 930mm or 630mm apart.
▪ There are also special adjustable lockbars that will position the
joists in increments of 50mm from 330mm up to 1530mm.
▪ Other types of lockbars provide for special situations such as
cantilevers or lowered soffits.
▪ High-density paper overlaid, 12mm formply is used as
formwork to produce a first class finish to the underside of the
slab
How it works - Temporary plywood formwork
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▪ The rigid formply sheets are
used in conjunction with the
lockbars and when locked in
place, provide lateral stability
to the entire Speedfloor
system during the construction
phase.
▪ Steel frames structures
▪ Masonry buildings
▪ Poured insitu or precast concrete frames
▪ ICF or Sip’s type construction
▪ Light gauge steel frames
▪ Timber frames
Support medium
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The Speedfloor composite floor system is suitable for use in
all types of construction including :
▪ Single residential houses
▪ Multi-storey residential buildings
▪ Single and multi-storey retail developments
▪ Mezzanine floors
▪ Carpark and storage buildings
▪ Multi-storey office complexes
Potential use
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The range of ends users includes :
▪ Faster to install
▪ Less crane time
▪ Less labour
▪ Less materials onsite
▪ Less reinforcing steel
▪ Less concrete
▪ Zero propping
Speedfloor VS Conventional Formwork
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Benefits of Speedfloor
Conventional framing using significantly more material, no access
Speedfloor soffit, clear access, no propping, less material
▪ Entirely stripped 3 days after pour
▪ Zero back propping
▪ Access for finishing trades 21 days
earlier than other methods
▪ More environmentally friendly
▪ Cost effective
▪ Fire rated to 90 mins
Speedfloor VS Conventional Formwork
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Benefits of Speedfloor
Conventional framing using significantly more material, no access
Soffit formed with Speedfloor giving clear access and minimal material
▪ The Speedfloor System is essentially a hybrid
concrete/steel tee-beam in one direction and an
integrated continuous one-way slab in the other
▪ The joist is manufactured from G350 mPa, Z275
pre-galvanised steel
▪ The rollformed shape with its pressed web produces
a rigid and accurate steel section that has high load
carrying capacity with no propping requirements.
Design
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▪ The performance of the Speedfloor slab is similar to that
of a conventional in-situ poured slab.
▪ To achieve STC 55 or more a board system on a timber or
steel grid can be attached directly to the underside of the joist.
▪ Alternatively the concrete topping can be increased until the
required rating is achieved.
Acoustics
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Full scale fire testing has established that the Speedfloor
system can be fire rated and will meet fire rating
requirements set out in the Building Code. Option for fire
protection are numerous but will include :
Fire
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▪ The use of fire retardant boards including gypsum and
other cementitious board systems
▪ Sprayed cementitious products directly onto the
Speedfloor joist
▪ The addition of reinforcement to the concrete topping
using the Slab Panel Method or other engineered
design methods
▪ Speedfloor rollformed joists are made from high
strength, pre-galvanised steel
▪ Concrete slab topping designed for minimum
compressive strength of 32MPa after 28 days
▪ Floor system design conforms to Composite Structure
Standards
▪ Durability meets Building Codes’ performance criteria.
Design
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Load span
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Load span graph – 75mm topping
Load v span tables are available that will optimise the Joist and concrete topping combinations.
▪ A load span calculator is also available that will further refine input information and give
engineers and users detailed data on the performance of the joist and topping selected.
Residential
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▪ Luxury multi-level
residential apartment under
construction in Melbourne
▪ Structural steel frame with
speedfloor system allows
for rapid construction with
zero propping
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▪ Fit out of apartments
▪ Suspended ceiling attached
to bottom of joist or hung
from concrete soffit
Residential
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▪ Duplex suspended floor
constructed with speedfloor
spanning from structural
steel frame
Residential
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▪ Suspended slab residential
build made simple with
Speedfloor and 90mm slab
Residential
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▪ Speedfloor joist spanning
core filled block walls.
Rapid construction. Zero
propping
Residential
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▪ Large townhouse
suspended slab formed
with insitu columns, steel
beams and Speedfloor
▪ Zero back-propping means
faster fit out
Residential
▪ The lightweight combination of
the Speedfloor joists and
structural steel resulted in
minimal foundations and a 16
week building program for this 10
storey carpark.
Carparks
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▪ The ramp structure is
cantilevered over an existing
building next door via steel
trusses on the roof which
required the carpark decks to
be in place before the ramps
decks could be built.
Carparks
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▪ This 22,000 m2 carpark is staff
and patient parking for Auckland
Hospital.The lightweight steel
structure also accommodates
three helicopter pads on the top
floor.
▪ Zero propping during the entire
construction period significantly
reducing time and onsite
materials
Carparks
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▪ The structural steel on this
public parking building was
erected to its full height before the
speedfloor was started, giving the
contractor a clean, uninterrupted
installation run to the top floor of
the structure.
Carparks
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▪ In doing this the project
achieved 2,150 sqm of finished
floor every 10 days.
▪ The feature panels for the
cladding were assembled on the
top of the parking deck and
“hung” in place before being
bolted in position
Carparks
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▪ Additional level added to
existing building
▪ The lightweight Speedfloor
system made this possible
▪ Joist spanning from
conventionally formed beams
▪ No propping under Speedfloor
deck which enabled lower floors
to stay open
Additional floor to existing building
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Additional floor to existing building
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▪ One Structure supplied entire
form, reo, concrete package
Summary of important advantages
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▪ Cost effective
▪ Lightweight, requiring less cranage than other systems
▪ Speed of erection
▪ Easily accommodates services
▪ Meets fire and acoustic requirements
▪ Flexible in its application
▪ No Propping
▪ A general weight saving throughout structural components
In this presentation we have endeavored to show you the many
benefits of the Speedfloor suspended concrete flooring system.
For additional information please visit our website at
www.onestructure.com.au
For all quote enquiries please contact:
Anthony O’Sullivan
Email: [email protected]
Ph: 0422 002 526
Contact Us
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