Subject:
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Re: New MOC - Giant cable-stayed bridge
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Newsgroups:
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lugnet.build
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Date:
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Thu, 5 May 2005 19:14:28 GMT
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Viewed:
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4337 times
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In lugnet.build, Duane Collicott wrote:
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Wow, very nice! They sure do make attactive bridges, don’t they? I can see
why they’re popping up all over the world these days.
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Duane-
The funny thing is that cable stayed bridges are not “new”. They’ve been popping
up all over the world since WWII. They just haven’t been as common in the US
where our aesthetic sense in public works is always overridden to save a dime
(or perhaps fatten a contractor’s wallet).
My understanding is the cable stayed bridges were important in post war Europe
as a means to build a lot of bridges quickly. One very nice feature is that
since they are completely supported by their towers (unlike a suspension bridge,
which requires towers and massive cable anchors), they can be built in one spot
-- and then moved! When I visited Dusseldorf in 1976, they had just moved a
major cable stayed bridge into position the previous weekend. The procedure is
to build the new bridge next to the old, keeping the old in service. Then,
temporarily reroute traffic to the new bridge. Then demolish the old and setup
the site. Then slide the new into the old position, typically in a matter of
hours or days. Then reroute to the new bridge. Total traffic down time: hours or
days!
-Ted
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