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Stacy and I are designing a small layout for Brickworld this year and we
want/need to have a bridge in the layout. We've been working to design the
layout using banquet tables (so I don't have to bring my own tables), yet we
still want an open space in the center. The way we have it designed
necessitates us to try and span 40 inches (128 studs) unsupported.
So here's the question...has anyone built an unsupported truss-style bridge
that's around a 128 stud unsupported span? I'm thinking if I sandwich the deck
(4x10 and 6x10 plates) between 1x8 bricks (below) and 1x16 Technic bricks
(above) and then use a standard truss structure with Technic bricks and beams, I
stand a chance of being able to support the bridge and the weight of one train
on it. However, I would love to hear some anecdotal evidence that this works
before I hit Bricklink and spend a bunch on plates, bricks, and beams to
complete this behemoth.
-Dave
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Message has 8 Replies:
 | | Re: Long Span Suspension Bridge?
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| "Dave Sterling smsrallysport.com>" <dave@ <spamsucks> wrote in message news:Jv2A1L.BAr@lugnet.com... (...) If you use a tensioned string support system underneath, you can go long distances with few parts. -Rob (17 years ago, 22-Jan-08, to lugnet.trains)
| | | Re: Long Span Suspension Bridge?
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| (...) How about some anecdotal pictures? This cable stayed bridge spans 192 studs and this arched truss bridge spans 288: (URL) This over truss bridge spans 192 studs: (URL) This under truss spans 192 studs and passed the 16 pound bowling ball in (...) (17 years ago, 22-Jan-08, to lugnet.trains, FTX)
| | | Re: Long Span Suspension Bridge?
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| (...) I built one a couple of years ago that spans 128 studs, with two tracks. It's pretty minimal. I used double 1x16 technic bricks to support the deck, then combinations of technic bricks for the trusses. The deck is just strips of 2x16 plates (...) (17 years ago, 22-Jan-08, to lugnet.trains, FTX)
| | | Re: Long Span Suspension Bridge?
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| (...) Well after reading your post one last time before I sent this I realized you wanted info on truss designs for a suspension bridge (like the Golden Gate) not a cable stay. But the second post threw me off due to the same problem I have had that (...) (17 years ago, 23-Jan-08, to lugnet.trains, FTX)
| | | Re: Long Span Suspension Bridge?
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| (...) Dave, I built a 128-stud, truss style bridge for NGLTC shows that's become a staple of the layout. I use ZNAP as structural "members" to go over the tracks. The bridge does not use any support other than the compression between two tables. (...) (17 years ago, 23-Jan-08, to lugnet.trains)
| | | Re: Long Span Suspension Bridge?
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| (...) (URL) This bridge> had a main span of 96 studs, and could have been more if I had more room on the end to attach the main cables further from the base of the tower. It could also be doubled in length by building the same from the other end. (...) (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
| | | Re: Long Span Suspension Bridge?
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| I've found the deck can be pretty insubstantial; even in minifig scale, the truss carries the weight. The Notre Dame Bridge is about 320 studs long and has been up for over a year now: (URL) At least, I have heard no news of its collapse. It can (...) (17 years ago, 24-Jan-08, to lugnet.trains, FTX)
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