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Concrete In Australia : June 2008
NATIONAL PRECASTER NUMBER 48 • MAY 2008 Four Commercial Terraces – A Completely Precast Solution National Precast Member Baseline Constructions Pty Ltd has developed a fine reputation in Sydney over more than a decade for providing a complete precast solution for a range of projects. In many ways they have pioneered the growing change to precast for projects in Sydney that a few years ago would have been considered in masonry. In 2004 Baseline engaged Hokin Design Group to provide the architectural services for four, four storey commercial terraces in Blackfriars Street, in the inner Sydney suburb of Chippendale. With a relationship going back to early 2000, the previous experience ensured that the design process was well understood and the solutions were tailored to efficient use of precast. The configuration of the site, which is approximately 20 metres wide by 24 metres with four approximately equal width terrace lots, lent itself to a simple precast concrete vertical structure on boundary and party walls, large open balconies on the front towards the street, and precast hollowcore floor planks spanning the terraces and for the roof. Paul Bettar, General Manager of Baseline Constructions said: “With the approved height restriction,the 150mm deep precast hollowcore floor and roof planks allowed four levels to be squeezed in within the height, a solution that could not have been obtained with flooring systems that require beams.” The resultant architectural expression met the requirement for a design of very simple appearance with only the thickness of the floors and walls showing on the façade. While the general appearance was simple, there was a layering of interesting detail created by grooves in the panels. The large balcony openings facing north towards the street were screened with large blade adjustable louvres for privacy, solar and weather protection. As well, they provided a fine textural contrast. The design lent itself to a very fast construction sequence where the structure could be erected quickly allowing finishing trades and services access to the building to work under cover and unhindered by formwork and back propping. The external end walls were 175mm thick ship-lapped painted precast panels, with the dividing internal walls between the terraces being a space-saving 150mm thick, while achieving fire and acoustic ... continued on page 5 Precast for Structural Engineers ONE DAY SEMINARS PRESENTED BY John Woodside together with local NPCAA precasters and engineers. For recent structural engineering graduates, those who wish to freshen up on the latest precast trends around Australia and those who are new to precast construction. These seminars will cover Materials & Tolerances, Precast Building Design, Manufacture, Transport & Erection, Design of Elements, Contractual Issues, Connections, Fixings & Joints. Opportunities to discuss your own precast challenge with industry representatives will be available at different times throughout the day. Handouts include The Precast Concrete Handbook on disk, worth $180. City Darwin Date Monday 2 June Melbourne Tuesday 17 June Canberra Tuesday 8 July Perth Venue Engineers Australia Designbuild Friday 17 October Master Builders Association Designbuild Members Non Members $350* $425 $400* For more information call Nicole at the Concrete Institute on (02) 9736 2955 or email firstname.lastname@example.org * Members prices apply to CIA and NPCAA members only. $475 NATIONAL PRECAST CONCRETE ASSOCIATION AUSTRALIA NEW