LONDON – Lighting Technology projects (LTP) has designed, installed and commissioned an architectural lighting scheme for the new Perryn Road footbridge that traverses a busy highway into London. SH Structures, which built the bright yellow, 32.6-meter wide span as part of a larger project for Transport for London (TFL), appointed LTP as a specialist lighting sub-contractor. Grimshaws worked with Hyder Consulting on the design of the bridge, and Carillion served as the main contractors.
Terry Reeves and Jonathan Adkins led the LTP team. "Bridges always require special and individual considerations when key-lighting, involving plenty of creative and practical thought," Reeves said.
The lighting brief for the main bridge span included producing an environmentally friendly, unobtrusive, elegant and safe lighting solution emitting the correct levels of luminosity to meet BS design standards and complying with all public health and safety regulations.
LTP specified 70 of the new 400mm white BWS 520 4 Watt inset handrail LED fixtures from Phillips, 35 of which are used on each side of the structure which straddles the road diagonally.
The lighting units had to be tough, durable and vandal-proof, with no exposed casings. The essential effect is to neatly key-light the bridge decks for the public without causing any glare or unnecessary distraction to passing motorists below.
LTP and SH Structures collaborated with CAD and 3D viewing software to develop a combination of rigid and flexible stainless steel conduit into which the LED strips lights are ensconced, complete with integral cable routings and duct ways.
This part of the operation was completed at SH's workshop, so when the bridge span was finally installed on site – by crane, overnight – everything was set for the lighting fixtures to be inserted and wired up.
The bridge is serviced by a set of ramps and stairs, both wrapping around its main support columns, allowing full access for anyone needing to use it. These are lit with a series of IK10++ rated fluorescent fixtures as stipulated by TFL.
The bridge structure is constructed from standard mild steel sections and coated with an epoxy glass flake paint system. The decks have an anti-slip floor finish. The total weight is approximately 200 metric tons, and the contract value to SHS was £1.36 million.
The Perryn Road footbridge project follows other recent bridge lighting schemes supplied by LTP, including Tradeston Bridge over the Clyde in Glasgow and the Sidings Bridge near Swansea.
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