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The Petronas Twin Towers Project Lifecycle
Transcript of The Petronas Twin Towers Project Lifecycle
The driver for the project was to build the tallest building, this was supported by the Malaysian Government, to boost their standing within the world.
Prime Minster had a huge impact during the design stage of the two structures.
In 1990 planning begun, while in 1991, Cesar Pelli won the design for the towers.
The Twin Towers were assigned to two separate contractors, one for each tower; Samsung C&T (tower one) and Hazama Corp (tower two & sky bridge). This was to promote competition.
The Construction site was chosen: Kuala Lumpur Race Track.
Cesar Pelli's designs for the towers were rejected by the Prime Minister, as they weren't Malaysian enough', meaning that they didn't represent Islam sufficiently.
The Prime Minister begun to re-design the floor plan for the building, changing it to two interlocking squares, creating a shape of eight-pointed stars , which symbolize the Islamic principles of "unity within unity, harmony, stability and rationality".
During the planning stage the cost estimation is determined. The Malaysian budget only allowed for 6 years of construction.
Additionally, the planning stage is the final 'green light' for the project to commence.
During the Execution stage, the scope and schedule are identified and determined.
The Schedule allowed for 4 days of construction per floor, it initially took 8 day, they had to construct uninterrupted, 24 hours a day, 7 days a week.
Construction began in early 1993.
A site establishment is conducted during this stage, however, the engineers discovered that there had never been a proper analysis of the site, the site came to a standstill.
Geologists looked for bedrock, but found that the site was on decayed limestone and on the edge of cliff.
The site was proposed to be moved 60 meters onto the softer ground, were they could build their own bedrock, consisting of concrete.
The sky bridge connecting the two towers was design for emergency purposes, such as a terrorist attack, fires, and other emergencies.
By Ashleigh Kelly and Hayden Stewart
Architect - Cesar Pelli and Associates
Client - Kuala Lumpur City Centre Holdings Sdn Bnd.
The development of the Petronas Twin Towers begun in 1990, and was completed in 1996.
88 storey office towers, with a connecting sky bridge
Tower One construction team - Led by Robert Pratt. T1 Pinnacle Team - Hazama Corp
Tower Two and skybridge construction team - Led by Jon Dunsford.T2 Pinnacle Team - Samsung C&T and Kukdong Engineers & Construction.
Estimated to build in 8 years, built in 6 years, thus under
Total cost - $800 each tower, thus, $1.6 billion
Estimated to cost $700,000 each day of construction (about 8 years, $2 billion) - thus, came under budget.
Two 88 story towers, with a connecting bridge.
The sky bridge connecting the two structures was also designed to act as as emergency escape, in the case of terrorist attacks and fires.
Pinnacles on top of the towers - design to represent islamic culture.
The use of glass windows
Strive for the tallest building and originality.
The not suitable bedrock (foundation).
A lack of steel
The concrete was not suitable, too soft.
They had to create a new form of concrete that acted the same as steel; strong with a degree of flexibility.
Flooring was time consuming.
The construction was estimated to take 8 years, however there was an eight month delay.
It was completed in 6 years, two years under what was predicted.
It was vital that the building was constructed to the management plan, as it would cost $700,000 per day after the deadline.
Issues During Construction
Issue One - The foundation Slab
If the concrete dried unevenly, the slab would crack, thus seriously weaken the ability to support the building above. Therefore, they decided to pour the concrete all at once, scheduling concrete trucks to arrive every 2.5 minutes for 52 hours, without a break.
Issue Two - The weather
The Malaysian weather is susceptible to torrential rain, this is also problematic to the slab, as the concrete can get too wet, and become ruined. They covered the entire slab with canvas, the equivalent to 56 circus tents.
Petronas Tower Floor Design,
During the final stage of construction the pinnacles were constructed and placed on top of the towers, completing the record for the tallest tower.
Construction was completed in 1996, therefore reaching the 6 year deadline, with days to spare.
Image source: http://www.abc.net.au/news/2012-01-01/fireworks-explode-above-petronas-towers/3754088
SRM181 - Project Management Unit Chair - Linda Tivendale