[ Project focus: Great Ormond Street Hospital ]
annually. Materials have been selected on their green credentials and have low embodied energy values. This environmentally conscious approach permeates
while waste heat recovery and reuse will be maximised, the result being an estimated offset of 2,000 tonnes of CO2
every element of the construction process, and all the companies working on site are encouraged to introduce measures to reduce their own carbon footprints during their work. NG Bailey is no exception, and Cunningham explains: ‘On a site level, we have tried to reduce packaging. For example, the light fittings get combined at retailers so we only receive one box per light fitting rather than one for the case, one for the lamp, one for the ballast, one for the flex, etc.’
Fixtures and fittings NG Bailey produced a technical submission for approval by the designers and GOSH for all the main packages, products and equipment. Subcontractors and suppliers have been key to this process and have often visited the site to be part of the technical submission approval sessions, to understand and answer first-hand any comments, and to ensure the products meet GOSH’s specification. Although most of the products used are commercially available, NG Bailey has had to commission some of the equipment for this project. For example, the bedheads are bespoke panels rather than off-the-shelf trunking and the theatre pendants are purpose-built, as are the integrated plumbing panels. Most of the plant and services hospital interface points are made especially for GOSH but from a range that the manufacturer has made before, while the diesel generators are not new technology but are configured to the project’s exact requirements.
Air force A series of further innovations will have a significant impact on reducing the hospital’s carbon footprint during construction and operational phases. Materials have been chosen on the basis of their long-term sustainability, such as the lightweight and highly durable external panelling, which received an ‘A’ grade in BREEAM ratings, and the use of 100 per cent recycled aluminium in the front façade. The use of natural ventilation in some of the wards
and in the visitor area will also be a key feature. A large ventilation shaft at the front of the building will provide this, with technology fitted to ensure air conditioning comes on only when necessary. Cunningham comments: ‘Sustainability is at the heart
of NG Bailey – not only in the work we deliver for clients to help them improve their environmental performance, but also through our own estate – so supporting BAM in its low-carbon approach to this project was as important to us as it was to the client.’
Onwards and upwards Engagement with GOSH, BAM and other supply chain partners has been, and will continue to be, an integral part of delivering the project successfully, with NG Bailey constantly interacting with all parties. During the pre-
The variety and complexity of the services installation is challenging but incredibly rewarding
construction period, it has involved the client team in engineering solutions and procurement decisions and is developing mock-up rooms with the main contractor to ensure quality standards are achieved and any potential problems ironed out before parts of the build get underway. At any one time NG Bailey has upwards of 150 personnel on site and its part of the project is scheduled for completion in November 2011. Once the Morgan Stanley Clinical Building is finally finished in May 2012, GOSH will embark on Phase 2B, the rebuilding of the current Cardiac Wing. This is expected to be completed in 2016, with the two phases costing a combined £321m.
All together now The ongoing redevelopment of GOSH will cement its standing as one of the world’s leading centres for child care. The final word goes to NG Bailey’s Tim Cunningham, who concludes: ‘This project is a fantastic example of what can happen when all the various elements act as an integrated part of the construction and design team. The variety and complexity of the services installation is challenging but incredibly rewarding, and we hope to be involved with further phases of the redevelopment.’
Going green
n Façade technology – The external façade achieves an ‘A’ rating in the BRE’s Green Guide to Specification. The overall envelope will achieve 34 per cent better than the requirements of Part L of the Building Regulations 2006.
n Partitions – High-performance wall board has 100 per cent recycled content, containing 20 per cent recycled newsprint and 80 per cent recycled gypsum.
n Timber – All timber for joinery finishes and construction will be FSC-certified, coming from a sustainable managed source, and will be treated with natural products where possible.
n Water – Water use is reduced with sensor taps, low dual flush toilets and showers instead of baths.
n Lighting – The building will maximise natural daylight to reduce the need for internal lighting. Presence detectors are used extensively throughout the building to automatically turn-off unnecessary lighting, and LED lighting will be used wherever possible to reduce energy consumption.
n Natural ventilation – A ‘mixed mode’ ventilation system is provided for the inpatient bed-pool areas. This system enables reduced energy consumption compared to an air conditioned system and provides the ability to limit maximum and minimum room temperature under natural ventilation, and reduces running costs.
n Modern method of construction – Off site construction will be used to reduce construction time, reduce labour on site, minimise transportation of materials to site, reduce construction waste, and increase quality.
n Tri-generation – Tri-generation is achieved with two 1.4MWE combined cooling, heating and power (CCHP) units potentially fuelled by environmentally friendly biofuel. This roof plant will provide electricity, heating and absorption cooling for not just the new clinical building, but also the whole of GOSH’s island site.
n Low-energy engineering – The engineering systems are designed to reduce the primary hospital energy use by using heat-reclaim by as many means as possible.
March 2011 ECA Today 29
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