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Cover story

News : Cover story

Design value adopted for wind pressure over the entire height of the building is 220kg/mm 2. The calculated maximum deflection at the top of the building is 280mm.

The towers pioneered a 'skylobby' lift system to reduce the number of lifts required. Each of the towers has 100 passenger lifts and four goods lifts. In an emergency it was anticipated that a fully occupied tower could be evacuated in five minutes using the building's lifts.

The towers used the biggest air conditioning system ever installed and cost $41M. It could filter 250,000m 3of air per minute and pumped 330,000 litres of cooling water per minute.

The fire sprinkler system used three 18,500 litre water tanks situated on technical service floors at the 42nd, 76th and top floor. All steel was sprayed with a 3mm coating of vermiculite plaster fire protection.

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