06 March 2007
Very big bore
Brian Micklethwait

This looks likes a fairly boring story in more ways than one:

Two of the world’s largest tunnel slurry borers are starting to drive 9-kilometer-long tunnels under China’s Yangtze River, in Shanghai. They are a key element of the $1.6-billion, 25.5-km Shanghai-Chongming Expressway. The link between Shanghai, Changxing Island and Chongming Island is to be completed in time for the 2010 Shanghai Universal Exposition.

At the Yangtze’s estuary in Shanghai, one record-breaking, 15.43-meter-dia tunnel-boring machine set off from a shaft at Pudong late last year. The second, close on its heels, is also expected to drive 400 m a month through clay, silt and sand.

Yeah, yeah, record-breaking, I thought.  But then I took a closer look at the picture there and saw the little tiny blokes at the bottom.  This really is a big borer.

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  1. Remember why the two tunnel boring machines digging the Jubilee Line extension were called Sharon and Tracey? It was because they were heading towards Essex, were always boring, and with a bit of luck they’d go all the way.

    Posted by Tim Hall on  06 March 2007 at 03:46 am

  2. Been noticing a lot of scale issues with chinese things.  Like the pictures of the Three Gorges Dam that look like it’s a 50-foot high dam, about 400 feet long.  Then you see a person on it, or a boat near it, and realize that it’s 10 times that size.

    Posted by Highway on  06 March 2007 at 04:26 am

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