Boundary wall construction at Amersham

What we are doing

Ventilation shaft building construction
Works to construct the operations building above the ventilation shaft have been ongoing since the start of the year and are close to completion. The main building’s steel frame, internal and external walls as well as the plenum cover slab are complete. External finishes to the headhouse and cladding installation will be complete by May 2025.

Boundary wall construction
External works to build a permanent boundary wall around the ventilation shaft compound will begin in June 2024 and continue through to May 2025. These works will consist of three activities, and these will be carried out during the hours of 8am to 10pm. The three stages of activity are:

• Construction of the reinforced concrete foundation
• Installation of inverted pre-cast retaining wall unit
• Installation of upper pre-cast flint panel

The last of the activities is likely to be of most interest to local residents and businesses as the flint panel will provide the external finish that passers-by and residents will see from Whielden Lane and the A404.

More information will be provided on the installation of the flint finish before these works begin in 2025.

Tunnel connections
Within the shaft itself, we continue to work on tunnel connections including demolition and break out of the cross passage which will provide access from one tunnel to the other, and ongoing waterproofing. These works will take place between the hours of 8am to 6pm, although 24 hour working has been permitted.

Download information relating to these works

• Boundary wall construction at Amersham

Find out more about

• Buckinghamshire and Oxfordshire

If you have a question about HS2 or our works, please contact our HS2 Helpdesk team on 08081 434 434 or email [email protected]