REFURBISHMENT RAILWAY CASE STUDY
building control and fire officers throughout the works. ‘It’s quite a complicated piece of work,’ Ashton explains. In addition to cabled and piped services,
lift pits and openings for escalators are also being installed during the platform refurbishments. The lifts and escalators will not, however, be installed until much later in the project when the bulk of the construction works have finished. An impulse fan system is also being installed at platform level to remove smoke and diesel fumes.
Sustainability As part of the funding criteria, the scheme had to achieve BREEAM Very Good status. ‘This is the best rating we can hope to get from the refurbishment of a 60s concrete building with minimal insulation,’ says Quaiyoom. The BREEAM requirement has
Modular services are installed in the car park next to the station, to form the new western concourse
refurbished. The challenge for the designers is that some of the these are not scheduled to be refurbished until Phase One has opened, with the result that some systems will have to be maintained using an interim solution. ‘Where we can we’re trying to replace all the PAVA and CCTV systems across all platforms [with night- time working], but critical systems such as power, fire alarm and sprinklers will be half new and half existing at the changeover,’ Ashton says. An added complication is that the sub-
surface platforms have the same fire and safety classification as an underground station; as a result, the engineers have to be in constant communication with local
Power proposal CHP may link to district heating
There is a possibility that the station could become the first run by Network Rail to have its own combined heat and power (CHP) system. Birmingham City Council
already has a district heating scheme in the north of the city and is keen for a new system to be installed as part of the redevelopment to serve the south of the city. ‘There is an aspiration to
28 CIBSE Journal February 2012
implement a CHP system from Birmingham City Council,’ says Stephen Ashton of Atkins. The CHP scheme is currently out to tender with the Official Journal of the European Union. Its adoption will depend on being able to develop a suitable business case for the site. According to Azhar Quaiyoom of Mace, there is a market for power at the station
but not for the heat, although the demand for heat may change if regeneration starts to take off to the south of the station. ‘We’ll analyse the tenders
that come back to see if there is a sound proposition that is viable that we can incorporate into the programme,’ he says. A site for the plant has been identified on the site’s north- west corner.
driven various initiatives, including the installation of a rainwater harvesting system, which will supply 60% of the toilet demand; the harvesting tank will also double up as an attenuation tank to help retain rainwater run-off on site. A low energy lighting solution based on LEDs will also be installed with daylight control to manage light levels.
The engineers have to be in constant communication with local building control and fire officers throughout the works. It’s quite a complicated piece of work
Other sustainable initiatives include a
natural ventilation solution for the main concourse. This uses openable vents incorporated into roof lights to induce the stack effect with cooler air drawn into the station through the various low-level openings. The vents will begin to open at 18C and will be fully open at 20C. The control of the vents is also linked to CO2 sensors and will open if concentrations levels reach 1,000 ppm. The vents will also open to allow night cooling in summer. Computational fluid dynamics analysis
by Atkins demonstrated that the natural ventilation system will keep passengers comfortable throughout the year. The passengers, however, will have to wait until the station opens in 2015 before they’ll be able to confirm whether this is indeed the case. CJ
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