Going underground: Tunnelling triumphs from The Engineer archive
Dec 08, 2017
It takes a lot more than the sea, a river or urban development to stop an engineer building the infrastructure that will help transport or improve the health of millions of people.
This can involve the perilous task of building tunnels and in 1858 a major tunnelling endeavour was required to save London from The Big Stink, a putrid stench that had befallen the capital.
June 1858: Commissioning London’s sewers
MPs finally got to grips with London’s growing waste problem when it literally got up their noses. The Big Stink – caused by a combination of hot weather and untreated human waste and industrial effluent – had forced MPs from the House of Commons, prompting them to rush a bill through parliament to build a new sewage system. The Metropolitan Board of Works’ chief engineer, Joseph Bazalgette, was responsible for designing and building the huge system of intercepting sewers, which is still in use today.
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March 1876: Building a Channel Tunnel
Excavation is one of the greatest challenges in any tunnel project, and in 1876 The Engineer was in no doubt about the future success of plans by Sir John Hawkshaw and Sir James Brunlees, founders of the original Channel Tunnel Company, who proposed a 31-mile tunnel link.
“For the execution of the work, as far as mechanical aid is concerned, there need be no apprehension, there now being ample means in the way of tunnelling machinery, and ample experience in its extensive use,” said The Engineer’s correspondent.
Despite The Engineer’s enthusiasm, a tunnel wasn’t completed for another 118 years.
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March 1869: The Tower Subway
It might seem counterintuitive to build a tunnel in place of a bridge, but that was the situation in 1869 when The Engineer reported on the Tower Subway in London. An attempt to bridge the River Thames had failed in 1863 because of ‘the great height required for the passage of ships’. This problem was eventually solved by Tower Bridge, but before it came Peter Barlow’s Tower Subway, itself a forerunner of the modern deep-level Tube.
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December 1939: Protective works on underground railways
With Britain’s population being urged to Keep Calm and Carry On, passengers on London Underground were faced with the prospect of flooding as a result of bombing by the Luftwaffe. To mitigate the risks of flooding, a solution was found that literally closed the floodgates and sealed tunnels from the ingress of water.
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2012: Excavating Crossrail’s tunnels
In just over three years, eight tunnel boring machines dug below London’s streets to construct 42km of new rail tunnels for Crossrail, Europe’s largest civil engineering project. When complete, new trains will run over 100km from Reading and Heathrow in the west, through new tunnels under central London to Shenfield and Abbey Wood in the east. In doing so, the project is predicted to bring an additional 1.5 million people within 45 minutes of London.
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2014: Thames Tideway tunnel
Joseph Bazalgette’s Victorian sewers stand out as a highlight of Victorian tunelling, but even he couldn’t have anticipated demands on a system that must now serve around 8.7 million Londoners. Bazalgette’s low-level interceptor sewers fill up and overflow into the Thames, a situation that will be resolved by diverting overflow into the new tunnel instead of the river.
REVISIT THE ENGINEER’S ARCHIVE HERE
2015: The world’s longest immersed tunnel
Designed to be constructed from vast pre-fabricated concrete sections that will be installed in trenches on the seabed up to 35m beneath the surface, the 18km Fehmarnbelt tunnel will comprise twin railway lines, four motorway lanes and a separate emergency tube. The tunnel, which will connect Denmark with Germany, will be five times longer than the current record-holder, the ∅resund tunnel, which is also in Denmark.
REVISIT THE ENGINEER’S ARCHIVE HERE
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