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Innovative construction and engineering
John Holland is one of the largest and most technically diverse construction and engineering companies in Australia. For over half a century we have created landmark projects for the public sector and private enterprise.
We carry out multi-disciplined, turnkey contracts of all sizes and complexity. In NSW and the ACT our experience encompasses roadworks, bridges, harbour and marine works, industrial and mining infrastructure, and water and waste water utilities.
One of our primary strengths is our partnering, “best for project” philosophy. This is an integral part of John Holland’s company culture and enables us to deliver better outcomes to our clients.
Our range of experience permits us to “think outside the box” and add value by implementing innovative (yet proven) solutions in every phase of our construction and engineering projects.
We have built a reputation over the years for consistently meeting and exceeding our client’s quality, time, project safety, environmental, and budgetary requirements.
John Holland is managed on a regional basis. This allows us to be sensitive to the individual requirements of the wide variety of locations in which we operate. Our offices are located in Sydney, Melbourne, Brisbane, Perth and Darwin. In NSW we have regional offices in Newcastle, Rutherford and Port Kembla.
Grinding Mill
The Hicom 110 Mill
The grinding chamber
The heart of the Hicom mill is the grinding chamber – a high-intensity centrifugal tumbling mill that has overcome the problems of conventional tumbling mills operating under gravity.
The grinding chamber uses a ‘nutating’ (rocking) motion about a fixed nutation point to generate centrifugal forces up to 50 times greater than gravity. This produces power densities up to 1,600 kW per m3 of mill volume, resulting in rapid particle breakdown to very fine sizes.
Materials then move up to the classifier which sizes the product into the grade of powder required. Depending on the media, powder can be produced in fine and ultrafine grades down to 50% smaller than two microns.
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Soundproofing options for every wall type
CSR soundproofing systems work with internal and external walls, whether they are masonry, single, or double stud walls. (See pages 4-6) Combined products will result in a dramatic reduction in sound transfer.
About CSR Gyprock soundproofing options
CSR Gyprock Soundchek is Australia’s first acoustic plasterboard, designed to reduce the transfer of unwanted noises through walls and ceilings. Soundchek’s lightweight design means it is easily attached to single or double-stud walls or masonry walls. Panels are only 10mm – 13mm in thickness, so they take up minimal space. Super high-density construction enables Soundchek to cut down on noise between rooms.
CSR Gyprock Resilient Mounts can be combined with Soundchek to further decrease noise transmission.
CSR Gyprock is Australia’s leading plasterboard manufacturer. All CSR Gyprock plasterboard products comply with Australian Standards, and are guaranteed to be free of defects in materials and manufacture.
About Bradford Insulation soundproofing options
Bradford SoundScreen Insulation is made from acoustically optimised rockwool. Bradford SoundScreen insulation can be installed between walls, under floors and into ceilings to dampen sound transfer.
CSR Bradford Insulation guarantees that all products are low allergen and will not pack down, shrink, mould, deteriorate or rot. When installed in accordance with directions, they should last for the lifetime of the home in which they are installed. Bradford Soundscreen is endorsed by the Allergy Research Foundation of Australia.
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© 2007 Lynda De Lacey