SMOKE VENTILATION FOR LONDON STATION
Fire engineering is essential in every modern building. But what happens when standards change? Existing buildings must be upgraded and new systems installed against the clock and in difficult circumstances. Railtrack overcame this problem when upgrading protection at London's Cannon Street Station without disruption to the public. This was achieved with the help of consulting engineers Frankham Associates, main contractor Mansell PLC, mechanical and electrical contractor MJN and specialist fire resistant ductwork supplier Senior Hargreaves.The tragic fire at King's Cross underground station first provided the spur for action. Consultations with the London Fire and Civil Defence Authority led to the London Stations Improvement Project, a Railtrack initiative to improve fire detection, alarm and escape routes for passengers. There were 13 stations affected.
The system uses the deep concrete beams that cross the roof to demarcate the fire zones and act as barriers to smoke travel. There are seven zones in total. Fire resistant ductwork by specialist contractor Senior Hargreaves is used for smoke removal from these zones. The majority of this ductwork, comprising almost 1.5Km in total, is 1.2 metre diameter, with flat oval ducts being employed where ceiling heights were limited.
The logistics of the installation are remarkable. Track possession was agreed with Railtrack six months in advance and the installation had to proceed to a strict timetable. Senior Hargreaves could only install the above track bed ducts between 10pm and 6am. This made it necessary to install and remove the Youngman's access at the start and end of each shift.
Uploaded: December 16, 1999
More information:
Mark Barry, Senior Hargreaves, Tel. +44 (0)161 764 5082 Fax. +44 (0)161 762 2336
Email: m.barry@senior-hargreaves.co.uk Web:
www.hargreaves-ductwork.co.uk
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Senior Hargreaves
Lord Street, Bury
Lancashire, BL9 0RG, United Kingdom
Tel.
+44 (0)161 764 5082
Fax.
+44 (0)161 762 2336
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