Work at HS2’s Victoria Road site in Acton has taken a significant step forward, following the completion of construction for the base slab of the Victoria Road ancillary shaft.
HS2’s main works contractor Skanska Costain STRABAG joint venture (SCS JV) began permanent work in February 2021, when a 160m3 concrete collar was first poured around the site of the shaft.
The internal shaft, which is 30 metres deep and 25 metres in diameter, was then built using precast concrete segments and using a sprayed concrete lining technique.
A team of around 30 engineers and operators have now completed the shaft, with a 3.3-metre-thick base slab constructed in three different pours.
The site at Victoria Road will be used by SCS JV to assemble and launch two tunnel boring machines that will dig the 3.4-mile eastern section of the Northolt Tunnels.
The TBMs are due to arrive in early 2023 and will begin the 12-month tunnelling programme later that year.
The ancillary shaft will then eventually provide ventilation and emergency access to the Northolt Tunnels when they are in operation.
To read the full story, see RAIL 955.
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