Keltbray has secured a contract with the Align JV to deliver key structural elements of the first two ventilation shafts on the Chiltern Tunnels Section for HS2
Keltbray will provide construction services for the first two ventilation shafts and head houses on HS2’s first two giant tunnel drives at Chalfont St Peter and Chalfont St Giles.
The shafts will provide ventilation and emergency access to the 10-mile-long tunnels Align is digging under the Chiltern Hills.
Keltbray will provide:
- Reinforced concrete works at the base of the shafts, to create a collar structure to enable the TBMs to pass through the base of the shaft
- Internal shaft construction works to build slip-formed concrete cores and lining walls
- Excavation and substructure construction of Head House buildings.
Excavation of the first shaft to a depth of 78m located close to the village of Chalfont St Peter has already been completed, ready for Keltbray to start work.
After the construction is complete the shaft will be topped with a head house inspired by nearby barns and other agricultural buildings to help it fit into the surrounding landscape.
‘Major rail infrastructure works’
Tim Lohmann, director of strategic engineering at Keltbray, commented: “Keltbray is delighted to have secured this major package of rail infrastructure works with the Align JV to deliver on this important opportunity for HS2.
“The tunnels form part of the HS2 network that will help connect the country, create thousands of jobs and rebalance the UK economy. We’re delighted to be involved in such a historic project.”
