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Concrete In Australia : June 2008
NATIONAL PRECASTER NUMBER 48 • MAY 2008 ... continued from page 4 separation. These panels were typically 9.5 metres long by 3 metres high, weighing 11.5 tonnes. A total of 210 hollowcore floor panels, generally 9.5 metres long by 1.2 metres wide comprised the floors and roof slabs. The 150mm deep hollowcore was given a 60mm in-situ concrete topping reinforced with a layer of SL62 to internal areas and SL82 to external areas. Jeff Hokin of Hokin Design Group said: “In summary, from an architectural perspective, the use of precast in building design should be used as a core part of a building’s architectural expression and create a strong discipline for the structural layout. It works best where there is relevance for repetitive and regular layouts, and this should be clearly expressed through the design outcome.” “The major challenge is to ensure that there is a good balance between solid and void, with as many large openings as possible”, he said. This design approach achieved a very buildable and attractive result at Blackfriars Street. Project Details: Developer: Building Design: Engineer: Head Contractor: Four Commercial Terraces Address: 1 – 7 Blackfriars Street, Chippendale, Sydney Chiswick No.1 Pty Ltd Hokin Design Group Meinhardt Baseline Constructions Pty Ltd Precast Supplier: Hanson Precast Pty Ltd The new Bulk Liquids Berth at Dampier’s Burrup Peninsula, in WA’s north, handles the loading of liquid ammonia. It consists of a 490 metre long access trestle jetty and a berth incorporating four mooring dolphins, four berthing dolphins and a large loading platform. The berth has been designed to accommodate vessels ranging from 5,000 DWT to 65,000 DWT and has a design ultimate wind velocity of 350 km/hr. The nearly 500 metre long jetty has 15 spans of 32 metres and a 20 metre access bridge. The trestle jetty supports comprise twin 1,050mm diameter steel raker piles supporting precast pile caps and in-situ infill headstock. Precast prestressed concrete TeeRoff Beams span between headstocks, acting compositely with the in-situ concrete deck. The 40 TeeRoffs supplied by National Precast Member Delta Corporation each weighed 56 tonnes and were 32 metres long by 2.5 metres wide, being 1.5 metres deep. They incorporated an up-stand kerb to one edge of the beam. Specification called for a 50MPa Silica Fume Concrete with a minimum of 35mm cover to the reinforcement. While manufactured in Perth, the beams were transported over 2000km to Dampier, using steerable jinkers. ... continued on back page Thinking precast? Use a National Precast Member. Committed to providing quality products and services to the construction industry. All members have: * A minimum of 3 years manufacturing experience * Purpose-built manufacturing facilities * Appropriate QA procedures * Appropriate OH&S systems * Technical & engineering competence * Financial stability * Environmental compliance For a list of Members go to: www.nationalprecast.com.au/members/corporate_members Concrete in Australia Vol 34 No 2 31 Precast can handle 350km/hr winds at Bulk Liquids Berth Jetty