The viaduct has been designed with a low profile. Credit: HS2.

The construction of High Speed Two (HS2)鈥檚 Thame Valley Viaduct in the UK has successfully passed the halfway point, marking a major milestone for the development.聽聽

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Spanning the floodplain of the River Thame, the 880m viaduct will support HS2 trains travelling at speeds of up to 225mph between London and Birmingham. 

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The project, located near Aylesbury, has seen 44 of its 72 customised precast beams positioned and 66 of the 70 piers installed.聽

The design team, inspired by Spanish high-speed rail viaducts, has implemented a simple structural solution using two large hollow U-shaped beams per span.聽

These are produced nearly 85 miles away on the Isle of Grain in Kent. 

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This approach eliminates the need for concrete to be poured on site, as well as reduces the carbon footprint of the structure by approximately one-third.聽聽

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The viaduct has been designed with a low profile, standing 3m above the ground, ensuring that HS2 services can continue operating even during heavy rain and flooding. 

HS2 main works contractor EKFB, which is a collaboration between , Kier, Ferrovial Construction, and BAM Nuttall, designed the viaduct.聽

FC Civils Solutions served as the specialist on-site construction partner. 

The larger precast beams used at the site are said to have been secured directly to one another, speeding up the work with up to six 90-tonne beams being installed each week.聽

Once in place, specialist teams are noted to begin threading steel bars between the beams and post-tensioning them to provide the necessary structural strength for the high-speed trains. 

Additionally, the Kent-based factory produced the parapets and concrete planks for the deck supporting the tracks.聽