Home » HS2 completes world’s longest box bridge slide

HS2 completes world’s longest box bridge slide

by Sion Geschwindt
HS2 box bridge

Last week Friday (29 December), HS2 Ltd announced that it has successfully slid a 12,600 tonne bridge a record 165 metres to position it across a motorway in Warwickshire.

Balfour Beatty VINCI (BBV), the construction contractor for HS2 in the Midlands, worked around the clock to move HS2’s Marston Box bridge into place over the M42 during the Christmas period – the quietest time on the roads.

The operation took 40 hours, at a speed of 4 metres per hour, from Saturday 24 to Monday 26 December during a 10-day closure of the motorway between Junctions J9 and J10 (northbound and southbound).

Over the last six months, the giant 86 metre-long structure was built on land next to the motorway. The structure, developed by a Design Joint Venture of Mott MacDonald and Systra, working on behalf of BBV, has a base, three walls and top slab.

The sliding mechanism, designed by specialist civil and structural engineering company Freyssinet, allowed the box to be pushed into place over the motorway on a guiding raft over a distance of 165 metres – which is believed to be the world’s longest box slide.

On completion, the whole structure will be around 190 metres in length, and will carry HS2 over the motorway as it heads north to Crewe, or on its southward journey as it loops into Birmingham Curzon Street or continues straight on to Interchange Station in Solihull, Old Oak Common Station and London Euston.

Once built, the railway bridge will connect to Dunton Wood Embankment to the south and the Birmingham and Fazeley Canal Viaduct, which crosses the heritage canal, to the north.

The motorway reopened in the early hours of this morning (3 January).

Rail Minister, Huw Merriman, said: “This is yet another astonishing achievement by HS2 – a project which is already changing lives through employment and regeneration, and will completely transform the way we live and work once trains hit the tracks.

 “Thank you to the 450 people working over the Christmas period on this incredible operation, who are playing their part in bringing this pioneering project to life. What a way to end the year.”

 HS2 Ltd’s Civils Delivery Director, Mike Lyons said: “This is the first box slide of its kind over a motorway in the UK, and we believe it’s also the world’s longest slide, so it’s a great achievement for HS2 as we quickly approach peak construction.

“It’s fantastic to celebrate another big milestone for a project that is already providing work for almost 30,000 people today, and in the future, it will encourage people to use zero carbon public transport.”

Sasan Ghavami, Balfour Beatty VINCI’s Construction Director for the project said: “We’re extremely proud to have successfully delivered the world’s longest box slide. It’s a huge achievement for our project team and everyone connected with Balfour Beatty VINCI.

 “We’ve used innovative construction techniques and worked tirelessly throughout the Christmas period to move this 12,600 tonne bridge over the M42 motorway – all done with the aim of keeping disruption to an absolute minimum.”

Read next: HS2 brings hydrogen power to Euston station site

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