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How do engineers bore a large tunnel?
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To make large tunnels through rock, engineers use a TBM (tunnel-boring machine). This has a rotating cutterhead studded with hardened-steel picks that cut through the rock. The cut rock is passed back on a conveyor belt to wagons, which take it to the surface. The TBM shown here helped to bore the two parallel main tunnels of the 31 miles(50 km) long Channel Tunnel between England and France. | | The huge cutterhead that bored the Channel Tunnel measured about 7.6 metres across. |
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Previous:
Back
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Book:
1001
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Section:
Science and Technology
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Chapter:
Industry
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