my invention reasons: to provide building construction market with precast concrete system that...
TRANSCRIPT
MY INVENTION REASONS:
• to provide building construction market with precast concrete system that satisfies variety demands of people’s life styles from poor to rich,
• to find the marvellous blend of building design and new technology to give architectural and structural building requests together with design freedom and construction quality, speed and economy,
• to overcome some drawbacks in current construction methods, by changing the way of the building construction,
• Some drawbacks are: • using a large number of small individual components, popular called “ stick
construction “,
• time consuming and expensive methods,
• a lot of on-site labour, noise, dust and waste,
• significant labours’ effort and skill to bring to completion of even small building,
• poor acoustic, fire resistance and thermal properties,
• poor quality in sense of strength, durability and accuracy in dimensions,
• vulnerable material properties towards termites, rottenness and moisture.
SOME ILLUSTRATED DRAWBACKS
Lot No: 4 Malvern Road, GLENWOOD NSW 2148, BLACKTOWN COUNCIL, Date: March 2001
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Lot No: 4 Malvern Road, GLENWOOD NSW 2148, BLACKTOWN COUNCIL, Date: March 2001
POOR CONCRETE QULITY &
EXPOSED STEEL REINFORCEMENT
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Lot No: 4 Malvern Road, GLENWOOD NSW 2148, BLACKTOWN COUNCIL, Date: March 2001
SOME ILLUSTRATED DRAWBACKS - continue
Lot No: 4 Malvern Road, GLENWOOD NSW 2148, BLACKTOWN COUNCIL, Date: March 2001
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Failure of Brick Facing on High - Rise Buildings
Bed joint at shelf angle
Typical cavity wall and veneer
Extra job - Turning of panels Aerial view of erecting at narrow site.
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I chose concrete because concrete:
• is in tune with the environment, (concrete helps protect our natural resources and affords unique benefits to consumers),
• ingredients (water, aggregate and cement) are abundant in supply and take a lesser toll in their extraction than other construction material,
• is an ideal medium for recycling waste or industrial byproducts (blast furnace slag, recycled polystyrene and fly ash),
• has another environmental plus as energy efficiency payback material
• is modest in its energy needs, (the only energy intensive demand is in the manufacture of portland cement, typically a 10 -15 % component of concrete,
• is suitable for waste minimization and long life (it is used on and as-needed basis and leftovers are easily reused or recycled),
Conclusion:
• Concrete has a future.
I chose precast concrete because precast concrete:
• gives freedom in design to create a unique identity (design flexibility),
• provides Thermal Comfort because thermal mass gives thermal lag,
• gives opportunity to perceive a construction and use of a house as a machine with multiple functions to better satisfy every day the more sophisticated needs of public,
• has no wastage and harm impact on environment,
• helps to have affordable, cost – efficiency private and public housing,
• helps to builders to save enormous amount of time by avoiding weather delays and builders do not have a congestion on building site.
Conclusion:
• Precast concrete is eminently
suitable material for innovations
in building construction and
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• Precast Concrete Characteristics and Performance: - Energy Efficiency
How does Thermal Mass Work?
• Offset of peak temperature is approx. 6 hours and known as the thermal lag.• It means the maximum indoor temperature will not occur until 6 hours after the maximum outdoor temperature has been reached.• Thus thermal mass tends to 'iron out' (settle) the outdoor variations in temperature, providing a more uniform and pleasant indoor living environment
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This is a typical supporting arrangement for a non-loadbearing (cladding) panel, using a corbel and dowel.
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In a loadbearing situation, panels bear upon and are connected, generally by dowels to the panel below.
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• Some Precast Concrete Characteristics and Performance:
PC owners
Frame owners
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• Wood and Concrete Price Comparison
Cost Competitive:
Over the last ten years, concrete prices have been remarkably stable. Recent price increases in other materials have generated interest in concrete building systems as never before.
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• The Construction Industry, is seeking a competitive edge over others in the same line of business worldwide,
• Speed, Quality, Economy; Customers demands – the precast concrete industry prides itself on being able to deliver all three, most of the time,
• Sustainable Construction (Efficient recycling becomes a survival requirement – a “Licence to Operate”),
• Declining Skill Levels (In Japan average age of skilled workers on buildingsite is over 50 years),
• Robotics and Automation (Laser on the shuttering table - saving time, avoiding defects and aims to reduce the labour content),
• Fluctuating Interest Rates (Forced to speed of construction), • Globalisation (Innovative uses of precast can be an effective counter to the
global marketing of steel building systems.
Conclusion: Innovation in the Construction Industry is never easy, but fortunately market forces the Industry to seek new solutions to survive.
THE ROLE OF PRECAST CONCRETE AS A CATALYST FOR INNOVATIONBy Gest Speaker Mr. Len McSaveney, Golden Bay Cement, New Zealand.
CONCRETE CONFERENCE: “CONCRETE IN THE 3RD MILLENNIUM”,
Brisbane, 17-19 July, 2003