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 HS2 Chilterns tunnel north portal view looking south
INFRASTRUCTURE

HS2 reveals final design for last of seven key Chiltern Tunnel structures

Final part of key design elements for HS2 Chiltern tunnels revealed

24 March 2023

 ‘Florence’ and ‘Cecilia’, the two TBM excavating the HS2 high speed rail project’s longest tunnels, have passed the halfway point on their 10-mile journey under the Chilterns in the UK
INFRASTRUCTURE

HS2 celebrates as longest tunnels reach halfway point

Major UK rail infrastructure project sees twin TBM reach halfway point under Chiltern hills

06 February 2023

 Piling to support HS2’s Colne Valley Viaduct has recently been completed
PILING

HS2 completes foundation work for UK's longest railway bridge

Piling has been completed for UK's longest railway bridge as a part of the HS2 rail project

02 February 2023

 The two TBM working on HS2’s tunnels under the Chiltern Hills have already reached the four-mile point, almost halfway through their journey
INFRASTRUCTURE

HS2's TBM reach four-mile point at Chalfont St Giles

Significant progress has been made on HS2's tunnels under the Chiltern Hills in the UK

17 October 2022

 HS2 Chiltern tunnel cross passage excavation in progress
INFRASTRUCTURE

HS2 completes first tunnel cross passages

First cross passages completed on UK's HS2 tunnels project under Chiltern Hills

24 August 2022

 To ensure tunnelling under the M25 motorway around London as part of the HS2 project did not cause any damage multiple monitoring systems were put in place
INFRASTRUCTURE

Monitoring ensures the structural integrity of a motorway during tunnelling

UK motorway safety during tunnelling project assured by Socotec Monitoring UK

16 August 2022

 Updated designs for the Amersham vent shaft headhouse on the Chiltern tunnel which forms part of HS2 high-speed rail line have been released
INFRASTRUCTURE

HS2 reveals updated designs for Amersham vent shaft headhouse

Revised design for HS2 tunnel vent shaft headhouse revealed by contractor

13 July 2022

 HS2 tunnelling machines have reach the Chalfont St Peter ventilation shaft 3.6 miles into their journey
INFRASTRUCTURE

HS2 tunnelling machines reach Chalfont St Peter ventilation shaft

HS2 tunnelling machines have reached the Chalfont St Peter ventilation shaft

15 March 2022

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