Bridge plans


C

Chemdawg

Member
Does anyone know where I can get a plan for a wooden tressel bridge or viaduct? I want to build my own since I haven't found one that I have been happy with. Since I'm freelancing my own railroad...... My bridge will be 2 lanes and rather long. So it can be an arch or whatever, I'm just looking for plans so I can have a start. Thanks in advance.
 
I LIKIE that!!!! I could probably make my own from that. Now do you think if I made one 30 inches long, it would be wise to put a concrete support from the center under the bridge to the ground? Or would 30" support itself from end to end? It's my own design, but If it's IMPOSSIBLE for a bridge to support itself when it's that long, I want to at least get the idea right.
 
30" is about 1/2 scale mile ... that's one long bridge. I would do a couple of supports along the span, but I'm no civil engineer.
 
I can make it shorter than that. I didn't realize that it would be that long when I first made the opening..... WHOA.
 
Simple mistake. So the 30" opening will work. It doesn't matter anyways. The opening in the benchwork is that size, but I can use the 2" white foam to build the sides down. I'm gonna go with the 30" I may even make a concrete support from the center to bottom just cause it looks cool.
 
That bridge is just under 17" long, or just over half of your open span. I've seen a lot of photos of these types of bridges doubled up end to end with a center support.
 
Chemdawg - you inquired about a 2 lane, wooden trestle bridge. Is this for auto or rail traffic? and did you mean trestle or through truss bridge? Wikipedia has a good pix of a wooden trestle bridge
https://en.wikipedia.org/wiki/Trestle

A good program to design your own for an understanding of forces is
http://bridgecontest.usma.edu/

If you are designing a rail bridge, you may want to consider a gauntlet track bridge - very unique.
http://en.goldenmap.com/Gauntlet_track

Design and scratch build is, when completed, very rewarding ;o)
 
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