Little Missenden vent shaft

There will be four ventilation shafts and one intervention shaft in the tunnel across the Chilterns. These would also be used for emergency access during operation. All the ventilation shafts use the same diaphragm wall construction method. The fourth of these will be alongside the A413 in Little Missenden. PRoW LMI 40/2 will be temporarily re-routed around the construction compound. The vent shaft depth will be 31 metres and the tunnel boring machines will reach here in August 2023. The vent shaft is due to be completed by April 2025. The site will also house an auto-transformer station. The approved access route is via the A413, A355 to Beaconsfield then the A40 and the M40. Traffic arriving at the site will do so via a traffic light controlled right hand turn across the dual carriageway.

Little Missenden vent shaft looking north – May 2022 (06_197)
Shaft excavation & secant piling for basement – May 2022 (06_196)
Little Missenden vent shaft north – Apr. 2022 (06_193)
Little Missenden vent shaft – Apr. 2022 (06_192)
Little Missenden vent shaft looking west – May 2016 (06_191)
Little Missenden vent shaft looking north – May 2016 (06_190)
Little Missenden vent shaft looking north – Nov. 2021 (06_189)
Little Missenden vent shaft looking south – Nov. 2021 (06_188)
A413 looking north – Jan. 2022 (06_180)
A413 looking north – Nov. 2021 (06_173)
A413 looking south – Nov. 2021 (06_171)
Little Missenden vent shaft looking south – Nov. 2021 (06_170)
Diaphragm wall cutting rig – Nov. 2021 (06_169)
Hydraulic grab used to dig the first six metres of each diaphragm wall panel – Nov. 2021 (06_168)
Cutting diaphragm wall panels – Nov. 2021 (06_167)
Cutting diaphragm wall panels – Nov. 2021 (06_166)
Storage silos – Nov. 2021 (06_165)
GFRP (glass fibre reinforced plastic) reinforcing frame – Nov. 2021 (06_163)
These are used where the TBMs will cut into the shaft- Nov. 2021 (06_162)
Slurry treatment plant – Nov, 2021 (06_161)
Slurry treatment plant – Nov. 2021 (06_159)
Slurry treatment plant – Nov. 2021 (06_158)
Bentonite slurry treatment plant – Nov. 2021 (06_157)
Concrete delivered from the south tunnel portal batching plant – Nov. 2021 (06_156)
Concrete pouring directly into a diaphragm wall panel – Nov. 2021 (06_155)
Removing the concrete pouring tube – Nov. 2021 (06_154)
Removing a section of the concrete pouring tube – Nov. 2021 (06_153)
Wheel washing prior to leaving site – Nov. 2021 (06_152)
Evening working with the concrete pour – Nov. 2021 (06_150)
Little Missenden vent shaft looking north – Oct. 2021 (06_141)
Little Missenden vent shaft looking north – Oct. 2021 (06_138)
A413 looking north – Oct. 2021 (06_137)
Little Missenden vent shaft looking north – Oct. 2021 (06_136)
Preparing to install traffic lights on the A413 – Oct. 2021 (06_131)
Looking east across the A413 towards the compound entrance – Oct; 2021 (06_130)
Looking north from the A413 towards Little Missenden vent shaft – Oct. 2021 (06_128)
Looking north towards Little Missenden vent shaft – Oct. 2021 (06_127)
Little Missenden vent shaft looking south along PRoW LMI 40/2 – Sep. 2021 (06_120)
A413 looking north – Aug. 2021 (06_116)
A413 looking north – Aug. 2021 (06_115)
A413 looking north – Aug. 2021 (06_113)
A413 looking south – Aug. 2021 (06_112)
Little Missenden vent shaft looking north from the A413 – Jul. 2021 (06_109)
Little Missenden vent shaft north west – Jul. 2021 (06_102)
Little Missenden vent shaft looking east – Apr. 2021 – (06_99)
Little Missenden vent shaft looking north – Jun. 2021 (06_98)
Little Missenden vent shaft looking north – Jun. 2021 (06_96)
A413 looking north – Jun. 2021 (06_95)
Little Missenden vent shaft north – May 2021 (06_90)
Little Missenden vent shaft north – May 2021 (06_88)
A413 looking north – Apr. 2021 (06_82)
PRoW LMI 40/2 looking north – Apr. 2021 (06_80)
PRoW LMI 40/2 looking north – Apr. 2021 (06_79)
PRoW LMI 40/2 looking north – Apr. 2021 (06_78)
PRoW LMI 40/2 looking north – Apr. 2021 (06_76)
PRoW LMI 40/2 looking south – Apr. 2021 (06_75)
Little Missenden vent shaft looking north – Apr. 2021 (06_71)
Little Missenden vent shaft looking north – Apr. 2021 (06_69)
Little Missenden vent shaft looking north across the A413 – Mar. 2021 (06_66)
Little Missenden vent shaft compound entrance from the A413 looking east – Mar. 2021 (06_65)
Looking north across the A413 towards vent shaft – Mar. 2021 (06_60)
Little Missenden vent shaft looking north – Mar. 2021 (06_58)
A413 looking south towards the compound entrance – Mar. 2021 (06_56)
Little Missenden vent shaft looking east – Mar. 2021 (06_55)
Little Missenden vent shaft looking north – Feb. 2021 (06_52)
Little Missenden vent shaft looking north – Feb. 2021 (06_50)
A413 looking north – Feb. 2021 (06_49)
Little Missenden vent shaft entrance looking north – Feb. 2021 (06_48)
Little Missenden vent shaft looking north – Feb. 2021 (06_47)
Little Missenden vent shaft looking north – Dec. 2020 (06_34)
Little Missenden vent shaft looking north – Dec. 2020 (06_33)
PRoW LMI 40 looking north – Dec. 2020 (06_32)
PRoW LMI 40 looking south – Dec. 2020 (06_30)
Looking west across the Little Missenden vent shaft – Dec. 2020 (06_29)
A413 showing long term lane closure looking north – Nov. 2020 (06_27)
Re-positioned entrance to Little Missenden vent shaft from the A413 looking south – Nov. 2020 (06_25)
Little Missenden vent shaft looking north from the A413 – Nov. 2020 (06_24)
PRoW LMI 40/2 from A413 – Nov. 2020 (06_23)
Little Missenden vent shaft looking north – Nov. 2020 (06_21)
Little Missenden vent shaft looking north – Nov. 2020 (06_20)
Little Missenden vent shaft looking east – Oct. 2020 (06_18)
Little Missenden vent shaft looking north – Oct. 2020 (06_17)
Little Missenden vent shaft looking north – Jun. 2020 (06_15)
Little Missenden vent shaft looking south – Jun. 2020 (06_14)
Little Missenden Vent Shaft looking west – May 2016 (06_12)
Little Missenden Vent Shaft looking north – May 2016 (06_10)
A413 looking north – May 2019 (06_09)
A413 looking north – May 2019 (06_08)
A413 looking north – Jul. 2016 (06_07)
Little Missenden Vent Shaft looking north – Aug. 2011 (06_06)
Little Missenden Vent Shaft looking north – Jun. 2018 (06_04)
A413 looking north – May 2019 (06_03)
Little Missenden Vent Shaft looking north – Apr. 2019
Little Missenden Vent Shaft looking north – Apr. 2019 (06_01)