Looking for Arch Bridge design

[Aralai]

I have a track that runs across a deep valley from one side to the other - fairly steep walls, not a long span. Thinking that prototype would call for an arch bridge?

Any ideas / prototype photos? The rail line is planned to be tunneled through both sides of the mountains at the valley - so it’s basically to span the gap between.

[andrechapelon]

I have a track that runs across a deep valley from one side to the other - fairly steep walls, not a long span. Thinking that prototype would call for an arch bridge?

Any ideas / prototype photos? The rail line is planned to be tunneled through both sides of the mountains at the valley - so it’s basically to span the gap between.

You mean something like this? http://en.wikipedia.org/wiki/File:GlacierLandwasser.jpg

And then there’s Starucca Viaduct, although it’s not built between tunnels. It’s also a lot longer than you need. http://www.newyorkrailroads.com/StarruccaViaduct/

Andre

[Aralai]

More like this maybe?

or:

or:

[Aralai]

Even this design could work:

[markpierce]

[twhite]

Most arch bridge kits that I’ve seen in HO seem to be of European design, but Faller makes a rather impressive steel arch bridge kit (imported by Walthers) that can be ‘Americanized’ to a degree. I’ve got one over Bullard’s Bar Lake on my Yuba River Sub.

Here’s a photo of it. Hope this might help:

Tom

[Aralai]

The span is not long, and the bridge is not intended to be the focal point, as I have a tall viaduct in front. I’m thinking that the last two photos I posted are probably closest to what will meet my needs. I actually like this one, but with two concrete piers instead of one.

It looks kind of weird with the steel tower. Any comments on using this from a prototypical pov?

[tomikawaTT]

The span is not long, and the bridge is not intended to be the focal point, as I have a tall viaduct in front. I’m thinking that the last two photos I posted are probably closest to what will meet my needs. I actually like this one, but with two concrete piers instead of one.

It looks kind of weird with the steel tower. Any comments on using this from a prototypical pov?

The reason for the steel tower in that specific case is probably to minimize interference with water flow when the waterway is in full flood mode.

My personal preference (heavily influenced by my prototype) would call for a three span deck girder, either on vertical masonry piers (conical, built of cut granite) or on in-slanting steel girder supports with a heavier center span to take the end thrust. The slanted supports would be used where the rails were really high off the bottom of the creek or if the creek was a floodway.

Interestingly, several of the examples in earlier poster’s photos were cantilever bridges, not arches.

Chuck (Modeling Central Japan in September, 1964)

[Aralai]

My personal preference (heavily influenced by my prototype) would call for a three span deck girder, either on vertical masonry piers (conical, built of cut granite) or on in-slanting steel girder supports with a heavier center span to take the end thrust. The slanted supports would be used where the rails were really high off the bottom of the creek or if the creek was a floodway.

Chuck (Modeling Central Japan in September, 1964)

Thanks - Do you have any pictures of it or a similar example?