Speed Floor Melbourne Engineers Presentation & Techinicial Data

Presentation

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

www.speedfloor.com.au

The SystemHow it worksDesignProject examples

Introduction


The System


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.


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


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


On site


• The joists are then spread 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


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


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


How it works - The Joist


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 :



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



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


How it works - The Lockbar


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


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


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


The range of ends users includes :

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


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


Seismic


The general arrangement of the joist and the shoe end together create a number of very real advantages for the Speedfloor system in seismic regions. Seismic design promotes relatively rigid interconnection of elements under normal conditions and flexible connection when subjected to seismic disturbance. It is absolutely imperative that the floor/beam connection does not induce moments into other elements of the structural system that would compromise the integrity of the structure.

The use of a ‘pin-jointed’ or ‘simply-supported’ connection between the concrete floor and the support structure allows the Speedfloor to flex without shearing preventing catastrophic collapse. The shoe will remain as a fail-safe mechanism on top of the support medium. Reinforcement bars connected to the structure prevent horizontal displacement of the concrete floor.

Seismic continued


The Speedfloor system generally uses much less concrete than pre-cast or in-situ concrete alternatives and hence has less mass. Under seismic conditions mass creates inertial force so less mass means less inertial force which can dramatically limit damage

As a ductile suspended concrete floor incorporating a

relatively high percentage of steel, Speedfloor is ideally placed to help dissipate the dynamic shock involved in seismic loading

Speedfloor has the ability to act as a diaphragm and

transfer the lateral forces through the floor to the shear walls located in other parts of the building.

Seismic continued


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


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


200 Series

Details


250 Series

400 Series

Load span


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.

Project examples

This 7 storey building was constructed using a structural steel frame, Speedfloor suspended concrete flooring system and pre-cast concrete cladding.

Route 66, Broadway, NZ


The ground floor retail has exposed Speedfloor joists fire-proofed using intumescent paint. The store’s services, such as electrical cabling, have been accommodated through the exposed joists.

Route 66, Broadway, NZ


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.

Commerce St Carpark


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.

Commerce St Carpark


This 22,000 m2 (220,000 ft2) carpark is staff and patient parking for Auckland Hospital.

The lightweight steel structure also accommodates three helicopter pads on the top floor.

Auckland Hospital Carpark


This commercial two-storey building with basement carparking was designed for a Blood-bank and commercial use.

Dilworth Building


Easy access for extensive range of services in thefloor-ceiling space was the advantage offered by the use of Speedfloor.

Dilworth Building


This 12 level apartment block with a footprint of 1750sq m is built in Wellington, one of New Zealand’s more notorious seismic regions.

The Terrace


These 86 up-market apartments were built in Auckland with stunning views of the harbor

The first two levels are for apartment parking

The Terrace


these

These twin 12 storey apartment buildings were built using a pre-cast concrete core and structural steel frame.

Speed of erection and the ability to take the floor system off the critical path were key ingredients in the developer’s decision to use Speedfloor.

Oceanside - Twin Towers


Retail on the ground floor, car parking on the first floor and commercial on the top two floors made this small building a challenge to construct.

Beresford St


With internal spiraling vehicle access ramps, noise and fire ratings were achieved with a combination of sprayed-on products and suspended fire rated ceilings.

Beresford St


Summary of important advantages


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.speedfloor.com.au or use the contact details below.

Email: [email protected]

Ph: 1300 66 77 67

Address: PO Box 3540 MANUKA ACT 2603

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Engineering

Speed Floor Melbourne Engineers Presentation & Techinicial Data