Chesham Road intervention shaft

There will be four ventilation shafts and one intervention shaft in the tunnel across the Chilterns. These will also be used for emergency access during operation. The intervention shaft will not have ventilation fans and will be alongside the B485 Chesham Road in South Heath. It will use a different construction method to the ventilation shafts. The site will also house an auto-transformer station. The tunnel boring machines will reach here in December 2023. The shaft is due to be completed by April 2025. Public Right of Way (PRoW) GMI 33/4 will be temporarily diverted before being reinstated along its original alignment.

Chesham Road vent shaft looking south – May 2022 (07_74)
Chesham Road vent shaft looking east from PRoW 33/4 – May 2022 (07_73)
Chesham Road vent shaft looking east – May 2022 (07_72)
Looking north from the Chesham Road intervention shaft towards the north tunnel portal – Apr. 2022 (07_71)
Chesham Road intervention shaft looking north – Apr. 2022 (07_70)
Chesham Road intervention shaft looking south – May 2016 (07_69)
Chesham Road intervention shaft looking south – Mar. 2019 (07_68)
Chesham Road intervention shaft looking north – Nov. 2021 (07_67)
Chesham Road intervention shaft looking south – Nov. 2021 (07_66)
Chesham Road intervention shaft looking north – Jul. 2021 (07_62)
Chesham Road looking west – Jul. 2021 (07_60)
Chesham Road looking south – Jul. 2021 (07_59)
Chesham Road looking south – May 2021 (07_55)
PRoW GMI 33/4 diversion looking south – May 2021 (07_54)
PRoW GMI 33/4 diversion looking south – May 2021 (07_53)
PRoW diversion – May 2021 (07_49)
Chesham Road intervention shaft looking north – Apr. 2021 (07_44)
Chesham Road intervention shaft looking south – Apr. 2021 (07_43)
Chesham Road looking west – Apr. 2021 (07_39)
Chesham Road looking south – Apr. 2021 (07_38)
PRoW GMI 33/4 looking east – Apr. 2021 (07_37)
Chesham Road intervention shaft looking east – Apr. 2021 (07_36)
Chesham Road intervention shaft looking west – Apr. 2021 (07_70)
Chesham Road looking east – Apr. 2021 (07_29)
Chesham Road looking west – Apr. 2021 (07_28)
Chesham Road looking east – Mar. 2021 (07_24)
Chesham Road looking west – Mar. 2021 (07_23)
Chesham Road intervention shaft looking south – Mar. 2021 (07_22)
Chesham Road intervention shaft looking south – Oct. 2020 (07_18)
Chesham Road intervention shaft (07_14)
Chesham Road looking east – Aug. 2020 (07_13)
Chesham Road looking west – Aug. 2020 (07_12)
PRoW GMI 33/4 looking east – Aug. 2020 (07_11)
PRoW GMI 33/4 looking west – Aug. 2020 (07_10)