HS2 goes modular with ‘green tunnels’

By Catrin Jones12 January 2022

HS2 has revealed the first images of the green tunnel in Northamptonshire - the longest out of three precast modular tunnels planned. Two more tunnels will be built off site, shipped and then installed at Wendover in Buckinghamshire and Chipping Warden in Northamptonshire.

HS2 reveal first images: Greatworth green tunnel portal view 1

The 2.4km tunnel will be built off site in a factory in Derbyshire before it will be shipped to the site and assembled. Once it has arrived, it will be covered with earth and landscaped to ensure that it fits in with the surrounding countryside.

HS2’s main contractor, EKFB - a team made made up from Eiffage, Kier, Ferrovial Construction and BAM Nuttall - took inspiration from the construction of recent French high speed lines to create an offsite modular build solution.

The Greatworth tunnel, designed as an ‘m’ shape double arch, will have two seperate halves with one for northbound and the other for southbound trains.

The design of the modular tunnels reduces the amount of concrete and steel used - both of which are significant sources of carbon emissions - therefore halving the amount of carbon embedded into the lighter-weight modular structure. Other benefits include less people and less equipment on site therefore reducing disruption for nearby residents.

HS2 reveal first images: Greatworth green tunnel portal from aerial view

Rohan Perin, HS2 Ltd’s project client, 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.”

Delivered directly to your inbox, World Construction Week Newsletter features the pick of the breaking news stories, product launches, show reports and more from KHL's world-class editorial team.
Longer Reads
ConTech: Not a silver bullet, but a long-term partner
Matt Desmond of technology giant Hexagon’s Heavy Construction division, talks to Construction Europe about the benefits to contractors of adopting digital technology
Interview: Sunward’s global access goals
OEM’s general manager explains the reasons behind its shift into access equipment manufacturing 
How construction firms can unlock the value of AI
Rob Smith, CTO of cloud services provider Creative ITC, explains how as-a-Service IT models are enabling IT leaders to unlock greater return on investment
Andy Brown Editor, International Construction Tel: +44 (0) 1892 786 224 E-mail: andy.brown@khl.com
Simon Kelly Sales Manager Tel: +44 (0) 1892 786 223 E-mail: simon.kelly@khl.com