Station refurbishment
and LU needed to understand if any specialist tools would be required to make the process easier;
• The air-handling units needed to fit onto the structural support system and concepts had to be designed to physically lift and lock the unit onto the support structure;
• The air-handling units were to be electromagnetically compatible with the London Underground environment; • Noise levels would not lead to passenger discomfort;
• There were effective condensation and drainage provisions; and • The units could be cleaned and maintained while attached to the station ceiling.
Raising the roof
The next issue was to tackle how the air-handling units could be raised onto the support structure efficiently. The main challenge was that the air-handling units needed to be transported to the station, then lifted and locked onto the support structure fixed to the station ceiling within one engineering night shift. Essentially this was a 90-minute window during the early hours of the morning. David Wilson, a director at TÜV SÜD,
explains: ‘Effectively, handling and lifting something the length of two saloon cars within the confines of the overnight engineering windows is no mean feat.’ While the support structure can be constructed across successive shifts, the air-handling unit must be raised in one go as something this size cannot be left on the station platform during service times. ‘The Cooling the Tube team knew that
to find the right solution would be complex and require in-depth engineering knowledge to develop something that would meet those needs. We were confident that we could offer that level of expertise.’
The project management team worked with Field International, a specialist in aircraft maintenance tooling, ground support equipment and bespoke precision
SEPTEMBER 2012 PAGE 29
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