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Getting trains running again on the Torres y Prietas
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 Posted: Tue Feb 8th, 2011 11:37 pm
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MinerFortyNiner
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Duane, great progress on the layout, I really like the road snaking up behind the ore bin and the retaining walls. This is already a great looking scene, and I look forward to watching you put your finishing touches on it.



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 Posted: Wed Feb 9th, 2011 12:10 pm
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elminero67
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Thanks Vern-Progress has slowed for the time being as I am trying to cram in 17 hours of graduate level classes to finish a Master's in Historic Preservation. So yeah, I'll be working at Starbucks next year...(contact me offline if you want free stirring sticks)



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 Posted: Sun Feb 20th, 2011 04:27 pm
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elminero67
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This morning I dismantled the suspension bridge. It was just time for a change. Now I have to come up with a new solution to span the nearly 6' wide canyon-Any ideas? Keep in mind that the management is cheap!

 

Last edited on Sun Feb 20th, 2011 04:38 pm by elminero67



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 Posted: Sun Feb 20th, 2011 04:32 pm
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Dwayne
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elminero67 wrote: This morning I dismantled the suspension bridge. It was just time for a change. Now I have to come up with a new solution to span the nearly 6' wide canyon-Any ideas? Keep in mind that the management is cheap!

 

http://img.photobucket.com/albums/v233/elminero67/1248.jpg

 




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 Posted: Sun Feb 20th, 2011 04:43 pm
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elminero67
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I like that-I could probably find some H.O. girders and fabricate the rest. Does anyone have an idea of how far a girder could span and still carry light trains? Looks like I would need to span at least 36-40 inches for the main span. 



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 Posted: Sun Feb 20th, 2011 04:51 pm
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elminero67
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Dwayne-Is that in Northern AZ? Looks a little like one on the AT & SF on its old Prescott Line, or the Canyon Diablo. This one is similar but doesnt have the variation in girder size and has more complex supports-I think I like yours better:



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 Posted: Sun Feb 20th, 2011 04:57 pm
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titus
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On a previous project I looked into girder bridges very similar to that. They are a bit pricey, but Micro Engineering offers a full line of girder kits, extensions, and steel towers in a handful of scales: http://www.microengineering.com/products_br.htm

Every time I see that bridge type I'm always reminded of Malcolm Furlow's "Crazy Horse Bridge" on the San Juan Central (http://www.polyweb.com/dans_rr/NarrowGauge2004/images/sjc014_98.jpg). If it's any help, in the book he builds that bridge by cutting plywood to the shape of the bridge, very similar to cookie-cutter style subroadbed, then affixes the girder plates to the plywood.

Last edited on Sun Feb 20th, 2011 05:01 pm by titus

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 Posted: Sun Feb 20th, 2011 05:32 pm
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MinerFortyNiner
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The older photo certainly isn't Canyon Diablo, but the bridge is of similar construction to the original bridge built there. I agree, spindly would look better.

The central gorge should probably be covered by one span, which could use HO viaduct side girders laminated to a plywood roadbed. When flash floods hit, any supports in that defile would probably be washed out.

Assuming it's about 24" across the deepest part of the canyon, you are talking more than 90 scale feet. While spans that long would usually have a girder arch support, perhaps double towers on each end with heavier side girders would look 'spindly' and yet provide 'high probability' of supporting the little trains.

I need to construct a similar bridge for my high line to cross Burro Canyon, in three spans via a light steel viaduct. I plan to use the Micro Engineering products for it.

Duane...was that heavy span on the Morenci Southern?

Last edited on Sun Feb 20th, 2011 05:34 pm by MinerFortyNiner



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 Posted: Sun Feb 20th, 2011 06:12 pm
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Herb Kephart
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36" is 144' in 1/48

Even with the lightest loading (10000# driver loading, cars 1000#/ft), a plate girder would have to be overly deep to carry the load at that span.

The beam in itself would be heavy enough to  pose a problem getting cranes of sufficient capacity to set the beam.

The shorter span sections of the bridge would have to be designed heavy enough to support the cranes, and the beam.

On a beam of that size, the weight of the beam itself would be a large amount of the total bridge carrying capacity.

The middle span would be more likely built as an inverted truss deck girder- with trusses 14-16' deep---still a spindly looking bridge.

Just don't expect me to walk across it.


Herb  :old dude:



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 Posted: Sun Feb 20th, 2011 06:31 pm
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Dwayne
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No idea where the bridge is located. I type "railroad bridge" into Google and it was one of a few images that popped up. :P

A friend of mine who is into large scale had a simple, inexpensive way to build a steel girder bridge. He used a 2x4 for the entire span. Then he added plexiglass to the sides. To that he attached L shaped pieces of channel to replicate the bracing. Painted the whole shebang black and propped it on spindly supports. Had it not been for him telling me how it was actually I wouldn've gone to thinking that he built it like a real bridge.



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