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ROYAL BAM GROUP N.V.

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Royal BAM N : HS2 reveals images of first landscaped ‘green tunnels' for Bucks and Northants

01/10/2022 | 04:18am EDT
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  • New images showing the green tunnel at Greatworth, Northamptonshire, with similar designs planned for Wendover and Chipping Warden.
  • Modular design set to cut embedded carbon in construction by 50% inspired by TGV-style off-site manufacturing techniques

7 January 2022 - HS2 today revealed the first images of the longest of three innovative 'green tunnels' that will be built across Buckinghamshire and Northamptonshire to help blend the new high-speed rail line into the landscape and reduce disruption for residents.

The one-and-a half-mile long Greatworth green tunnel will be built in a factory in Derbyshire before being shipped to site and assembled over the railway line as it passes the village. It will then be covered with earth and landscaped to fit into the surrounding countryside.

Applying lessons from the construction of the latest French high speed lines, the 'off site' modular approach was developed by HS2's main works contractor, EKFB - a team made up of Eiffage, Kier, Ferrovial Construction and BAM Nuttall.

Designed as a double arch, the tunnel will have two separate halves for southbound and northbound trains. Instead of the whole tunnel being cast on site, five different concrete precast segments will be slotted together to achieve the double arch - one central pier, two side walls and two roof slabs. All 5,400 segments installed at Greatworth will be steel reinforced, with the largest weighing up to 43 tonnes.

Concrete and steel are some of the biggest sources of carbon emissions within the construction industry and by reducing the amount of both materials needed for the tunnel, this lighter-weight modular approach is expected to more than halve the amount of carbon embedded in the structure. It also requires less people and equipment on site, improving safety and reducing disruption for residents.

HS2 Ltd's Project Client Rohan Perin, said: 'The Greatworth green tunnel is a great example of what we're doing to blend the new railway into the landscape and protect communities living close to the line. By adopting an 'off site' approach to manufacturing, we're also cutting embedded carbon from the design, improving efficiency, safety and making the whole construction process less disruptive for the community.'

EKFB Delivery Director Andy Swift, said: 'The green tunnel design is a combination of innovation, international engineering expertise and thoughtful landscaping for its local communities to enjoy. Once the tunnels have been built, the original earth removed from the cutting to make way for the tunnel, will be repositioned, creating a green space which will blend into the surrounding landscape.'

Similar structures will also be built near Wendover in Buckinghamshire and Chipping Warden in Northamptonshire, stretching for a combined total of four miles. The tunnels will all have specially designed 'porous portals' at either end to reduce the noise of trains entering and exiting the tunnel and small portal buildings to house safety and electrical equipment. Thousands of tonnes of rock and earth will be excavated during the initial stages of construction. These will be carefully separated and stockpiled on site for reuse later in the process, helping to keep trucks off local roads.

Tailored landscaping design plans will be developed for each tunnel, with thousands of native trees and shrubs typical to the local area, such as, Silver Birch, Oak, Beech and Willow planted to create new woodland areas around the portals and recreate the hedgerows and field boundaries on top of the tunnel.

All 13,290 segments for the three tunnels are being made by Derbyshire-based Stanton Precast Ltd, in a deal which has created almost 100 jobs at their Ilkeston factory. Stanton currently employs around 180 people at their factory and this deal has enabled the firm to increase their workforce by around 50%. New production sheds, casting and storage areas are also being built at the factory to accommodate the new work.

Disclaimer

Royal BAM Group NV published this content on 10 January 2022 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 10 January 2022 09:17:01 UTC.


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