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Continued...
This particular method is already used in Japan and Sweden where
dehumidification systems are fitted to newer bridges as a preventative measure.
However, this is the first time that a dehumidification system will be
retrofitted in an attempt to stop ongoing deterioration of the cable.
Bennett Associates have designed two 30m long steel gantries that
are traveling along each of the main cables up to the top of the towers some
100m above bridge deck level. The temporary gantries allow access so that work
can be carried out sealing the main cables along their full length, and
installing air injection and exhaust points.
Sensors are mounted at regular locations along the main cables to
monitor the condition of the air as it passes through. Bennett Associates have
designed a bespoke software system for recording and presenting the data and
allowing secure access and process control from any internet connection
worldwide.
Based in Rotherham, South Yorkshire, Bennett Associates is a
leading engineering solutions provider with expertise in tunnelling machinery,
pipelines, vessels, movable bridge structures, aerospace, oil & gas and nuclear
applications. Their projects include involvement in the Airbus A380
‘super-jumbo', the Falkirk Wheel Boat Lift, the Gateshead Millennium Bridge and
the Channel Tunnel.
February 2007
Related links:
 Innovative
Solutions for First Forth Bridge Inspection
Bridging
Gaps
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