Re: Curved bridge

On Sat, 28 Nov 2009 21:46:15 +0000, damduck-egg@xxxxxxxxxxx wrote:

On Sat, 28 Nov 2009 18:15:37 GMT, "Stevo" <stevo52@xxxxxxxxxxxxxxxxxx>
wrote:



John Dennis wrote:
On Nov 28, 2:03 am, Wolf K <weki...@xxxxxxxxxxxx> wrote:
Graham Harrison wrote:
I'm relatively new to all this so please bear with me.

How do I build a bridge on a bend? Do I have to build from scratch
or are there any kits (or even ready made)? I can find lots of
straight bridge kits but nothing on a curve. Oh, and I want a
bridge, not a trestle



There's at least a couple of curved bridges in NZ..


But as previously pointed out, they are a series of straight section,
arranged in a curve

One the most famous arched Railway bridges in Europe to be
constructed on a curve is the Landwasser viaduct in Switzerland.
However this shot
http://www.trekearth.com/gallery/Europe/Switzerland/East/Graubunden/Filisur/photo852786.htm

shows that this too is actually straight sections set at angles to get
the curve. Piers can be built thicker on one side relatively easily
but constructing an arch that has further to span on one side than the
other is quite a complicated excerise .You are basically constructing
a segment of a horizontal cone.

G.Harman

Concrete Bob's viaduct at Glenfinnan on the West Highland line is
genuinely curved.

Of course concrete is probably the easiest medium.

Kids will know it from the Harry Potter movies, where the flying car
dodged the train.

<http://www.lovetoescape.com/images/cd/GlenfinnanViaduct.jpg>

<http://maps.google.com/maps?hl=en&ll=56.876027,-5.432267&spn=0.001466,0.004705&t=h&z=18>
.

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