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by ArabianBusiness.com staff writer on Sunday, 20 April 2008
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Installation issues
Otis signed the contract for the subcontract package in March 2005 and began installation around November 2005. The completion of phase one, which incorporates the hotel lifts, is scheduled for completion in April 2008.
The remainder of the contract is due to be finished in December 2008, with final refurbishment and commissioning of the lifts that have been used in construction scheduled for 2009.
Installation of the lifts began when the central core reached 30 levels and is being carried out by using false cars, with no scaffolding needed. These were specially designed and built for the project especially for use in the central core.
Installation is proceeding in two shifts (day and night) and at different levels of the same shaft for the high-rise lifts. For example, currently the shaft of the main service lift is divided into four sections with very heavy-duty overhead protections, with a team on its own false car working in every section.
Six of the final lifts are currently being used during the construction process to transport both manpower and materials, reducing pressure on the hoists. By the end of April 2008, some of the higher rising lifts in the central core are expected to be handed over to the main contractor for use, with a total of 21 elevators eventually due to be used during the construction phase.
Double-deck design
The increasing high-rise construction worldwide has led lifts manufacturers to develop a double-deck or twin elevator design.
With this, instead of the conventional one lift car per shaft design, two passenger cars are contained within the same shaft, using the same guide rails.
Separate traction drives enable the two cars to travel to different floors simultaneously using the same set of guide rails.
The passenger destination and direction of travel for the elevators is recorded at the start of all passenger calls and an electronic destination control system assigns the cars to the levels according to efficiency of operation.
The electronic control also ensures that the cars never collide within the lift shaft.
One of the major benefits of such a system is the reduction in service core space that is needed in a building by effectively combining two lift systems into one. Time saving for passengers is also a major advantage.
The increasing high-rise construction worldwide has led lifts manufacturers to develop a double-deck or twin elevator design.
With this, instead of the conventional one lift car per shaft design, two passenger cars are contained within the same shaft, using the same guide rails.
Separate traction drives enable the two cars to travel to different floors simultaneously using the same set of guide rails.
The passenger destination and direction of travel for the elevators is recorded at the start of all passenger calls and an electronic destination control system assigns the cars to the levels according to efficiency of operation.
The electronic control also ensures that the cars never collide within the lift shaft.
One of the major benefits of such a system is the reduction in service core space that is needed in a building by effectively combining two lift systems into one. Time saving for passengers is also a major advantage.
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