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Concrete In Australia : June 2008
NATIONAL PRECASTER ... continued from page 1 NUMBER 48 • MAY 2008 Compression-seal joints This type of joint utilises a compressible impregnated polyethylene or polyurethane foam strip. The strip is pre-compressed and inserted into the joint after the panels are erected or it is glued in position before placement of the second panel (see diagram below). It then expands to fill the joint. The use of this type of joint seal is usually limited to low-rise buildings such as factories and warehouses where wind pressures are low. It can be used where spandrel beams, downturns or columns restrict the access required for placement of gun-applied sealants. Advantages – Simple and quick to install. – Panel edges can be plain or simple profiles. – Economical. Disadvantages – Cannot be fully weatherproof, so limited to low-rise industrial buildings. – Joint width is critical. – Maintaining compression on seal at intersection of horizontal and vertical joints is difficult. – Difficult to maintain and/or replace. – Time-consuming while erecting. Downstream blocks The downstream spillway’s stepped incline was made up of 3,060 concrete blocks, each measuring 2.4 metres by 600 mm) and weighing 1.2 tonnes. 0 c 2 to These blocks were manufactured in 4 groups of 6 mould forms, allowing a ctured per day maximum of 24 of the downstream blocks to be manufactured per day. Because access to the construction area was very tight, the downstreamthe downstream blocks could not be stored at the dam face. Once made in the factorin the factor arr tream tory,, the the blocks were loaded into specially manufactured cradles which carried six were transported to blocks each. Three cradles (18 blocks) per semi-trailer were transported to site and then were tower craned onto the dam in these cradles. which carried six spo The downstream blocks were doweled together, and were tied back into the RCC with tie bars, with the upstream panels’ inter-locking edges locking into each other, and again with tie bars securing them into the RCC. ng edges locking C. e s B AA B VERTICAL FORMAT HORIZONTAL FORMAT Compression seals glued to edge of one panel one e ng edges locking to the RCC. According to precast Project Foreman Dom Sandric, “Given the size and complexity of the job, and the huge number of individual components, it is amazing to think that only six to ten men at any one time were engaged in manufacturing the components. They did this over an eight month period.” For more information go to http://www.meanderdam.net.au.t.au. radles. e tied back into the d forms, allowing a allowing a p of 3,060 concrete ighing 1.2 tonnes. SECTION A-A SECTION B-B Concrete in Australia Vol 34 No 2 No 2 29 29 Meander Dam nd Dam