Timber structures
In 1788, the seemingly infinite supply of timber in Sydney was unfamiliar to the carpenters and builders. However, they soon became acquainted with the brittle gums, and the hard and durable nature of iron-barks and boxes.Long span timber structures in Australian have occurred in cycles. This rise and fall of activity defines a cycle yet each cycle has unique characteristics.They varied as the economic, social and technical conditions dominant in Australia varied.The earliest recorded timber bridge built in Australia was the Bridge Street bridge over the Tank Stream in Sydney constructed in 1788.Professor Colin O'Connor, in his book "Historical Bridges of Australia" records that by 1805, there were 10 timber bridges on the Sydney to Paramatta Road constructed of Iron bark or Blue Gum timber stingers and decking.In 1860, William Bennet, the Chief Engineer of the NSW Public Works Department (PWD) designed the first of NSW's five major timber truss bridge types, the old PWD type. Bennet pioneered long span timber truss bridges and this was the most widely used timber bridge form of the cycle. A 30.5 m old PWD bridge was built at Clarence Town in NSW in 1878 and remains standing.
Later plants used substantially the same process, although the endless wire mesh was replaced by a flexible steel belt. In this product the flakes were aligned in the plane of the board, giving better tensile and bending strength in that plane compared with the extruded board, in which the flakes were oriented at right angles to it. In the early 1970s particleboard surfaced with plastic laminates was introduced and in the mid-1970s, after much joint development with resin suppliers and CSIRO Division of Building Research, a flooring grade was developed using water-resistant phenol- or tannin-formaldehyde resin. References O'Connor, Colin, 1985. After bark removal the logs were converted into thin flakes which were dried, mixed with urea-formaldehyde resin and then continuously extruded through a heated die. Each row of arches is at 52 m centres while each arch spans 43 m. This gives a building over 156 m wide and 350 m long. Glue laminated rafters span between. It has made extensive use of sawmill residues, which now amount to over 50 per cent of its raw material. The factory, built in Homebush Bay was the single largest timber building ever constructed in Australia. Traditional Building Technology, Earth Construction Unit, UNSW Dept.
Common topics in this essay:
Pty Ltd,
Beale Co,
Homebush Bay,
Dial Dump,
Forest Products,
World War,
,
Newcastle Built,
Advanced Education,
Department PWD,
glue laminated,
radiata pine,
rain forest,
world war,
portal frame,
timber truss,
rain forest species,
forest species,
raw material,
cent raw material,
pty ltd,
ltd established,
plant mt gambier,
dept main roads,
glue laminated softwood,
|
Acceptance Essays
