Archetech Issue 30 2017 - Page 5

E arlier this year Network Rail opened the main concourse area to the largest transport project London has seen for many years – the London Bridge Underground Redevelopment. The mammoth £6.5Bn plan began back in 2011 and its central feature is the vast timber ceiling that spans the main concourse, roughly the size of the pitch at Wembley Stadium. Originally specified by architects Grimshaw, the BCL system was identified early on by Network Rail and main contractor Costain as the system of choice, given its unique design flexibility, outstanding acoustic performance and the increased design and installation services provided by BCL. Several challenges existed, not only the control of ambient sound from the 75 million passengers the station sees every year, but also the structural reverberation produced by on average 18 trains per hour and, given its prominence, the need for upwards blast protection in the event of a terrorist threat. BCL’s unique open-configurable system allowed the architects to design three unique panel configurations, which along with dedicated testing certificates, provided a mix of Class A and Class B acoustically rated panels to create a unique aesthetic to the project, whilst tackling sound reverberation targets. These panels were married with BCL’s unique ‘bomb-blast’ grid system, with double locking clips and secondary tethering, helping to prevent a ceiling from collapsing in the event of a blast. Lastly, the grid was fixed to the underside of the concourse using spring-loaded mounting brackets that help to deflect reverberation evenly and prevent the ceiling itself vibrating from the trains above. All of the Western Red Cedar used across the 7,000sqm expanse was fire treated to Class 0 and also finished with a clear UV resistant lacquer to provide a long-lasting quality finish. London Bridge is an excellent example of the BCL system and its ability to tailor both performance and panel design to each project uniquely. You can modify acoustic performance, fabric colours, timber species, specialist coatings and integrated services to deliver timber walls and ceilings that are not simply off-the-shelf replicas of other projects, but systems that are unique in both design and performance to your project. www.bcltimberprojects.co.uk · · · · · Class A acoustic rating Class 0 SSF fire protection UV resistant coating Bomb-blast grid system Flexible Design Design-flexible timber panel systems for the most demanding projects…