HS2 prepares for arrival of tunnelling machines at Chiltern tunnel

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Preparation has begun for the arrival of HS2’s first giant tunnelling machines at what will become the south portal of the 10-mile long Chiltern tunnel

The team, led by HS2’s main works contractor Align JV – a joint venture formed of three companies: Bouygues Travaux Publics, Sir Robert McAlpine, and VolkerFitzpatrick – spent seven months excavating more than 160,000 m3 of material in order to create a level surface from which the two enormous machines will launch early next year.

Weighing in at 2,000 tonne and stretching for 170m – the two tunnel boring machines (TBMs) are being built by world-leading German tunnelling machine specialists Herrenknecht – and due to arrive at the site, near to the M25, later in the year.

Alongside the excavation, a specialist team of subcontractors including Roadbridge and KV JV – formed from Keller Group plc and VSL International – also constructed a 17m high headwall through which the TBMs will break to begin their three-year long tunnel drive.

Once work is complete, the whole construction site will be landscaped with material excavated from the tunnels and trees planted in order to blend it in with the surrounding countryside.

A great team effort

Mark Clapp, HS2 Ltd’s C1 senior project manager, said: “Once complete, HS2 will transform rail travel across the UK, offering fast, reliable and low carbon journey options for millions of people across the country.

“The completion of the headwall and ground reinforcement is a major step towards the start of tunnelling and delivering on that goal.

“Safety is of course our top priority. The new Covid-19 processes and procedures put in place by Align ensured that we were able to keep to schedule while keeping everyone safe – and I’d like to thank the whole team for pulling together during what has been a difficult few months for the whole construction industry.”

Daniel Altier, the Align project director, said: “The completion of the soil nailing is a very visual example of how we are preparing our South Portal site for the arrival of the TBMs later this year. It is now clear for all to see where the TBMs will start their journey.

“This has been a great team effort by all concerned, considering the challenges caused by Covid-19, including HS2, Align and our colleagues at Roadbridge and the KVJV.”

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