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First HS2 tunnel shaft vent of its kind to be housed in a ‘barn design’

By on August 4, 2021 0


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High Speed ​​2 (HS2), which is building Britain’s newest high-speed rail link, has released images and details of its latest shaft ventilation cover design for the tunnel under the Chiltern Hills.

The construction of the HS2 presents many challenges, in particular in trying to reduce the impact of the rail infrastructure on the whole landscape. Working in partnership with the main works company Align JV (formed by a joint venture between Bouygues Travaux Publics, Sir Robert McAlpine and VolkerFitzpatrick), the design partners Jacobs and Ingerop-Rendel, the architects Grimshaw and the landscapers LDA, HS2 revealed the creative design of ventilation blankets planned to be built at the village of Chalfont St Peter.

To integrate perfectly with the surrounding environment at Chalfont St Peter, a building similar in design to the local barns will be constructed.

As can be seen from the photos, it is difficult to say the real purpose of the structure. As shafts for the tunnels below, the five shafts will provide ventilation and access to emergency services if needed.

Two tunnel boring machines (TBM) are currently working on drilling the 18,000 cubic meters of material which should be extracted from the new tunnels.

Once the tunnel boring machines have passed under the shafts, the development work can continue. The digging and laying of the concrete walls have already been completed.

Calfont St Peter CGI headhouse close up // Credit HS2

To stop traffic jams and large volumes of heavy goods vehicles, a site access road to the A413 Amersham Road was constructed, as well as a waiting area to prevent trucks from waiting on the road. Much of the chalk mined from the new tunnels will be used to reshape the site once the work is complete, reducing vehicle movement and emissions.

Rohan Perin, HS2 Ltd Customer Project Manager, said: “The excavation at Chalfont St Peter shows how much progress we have already made in delivering the Chiltern tunnels. Topped with a headboard inspired by the style of local barns and farm buildings, the shaft is one of the few elements of the tunnel that will be visible above ground level and shows how seriously we take our responsibility. to protect the landscape and the natural environment. “

Activity update at the Chalfont St Peter ventilation shaft site in Buckinghamshire
Credit: HS2

Align Project Director Daniel Altier added: “I am delighted with the progress we have made with the Chalfont St Peter well and that we have been able to put measures in place to limit disruption to the local community.

“We are very keen to ensure that all permanent structures on the project blend into the surrounding landscape and the main house at Chalfont St Peter is no exception.”

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