Subject:
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Re: World Record LEGO Bridge
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Newsgroups:
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lugnet.trains, lugnet.build
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Date:
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Wed, 23 Aug 2000 18:19:36 GMT
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Viewed:
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2810 times
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In lugnet.trains, Jeff Elliott writes:
>
>
> Wayne R Hussey wrote:
> >
> >
> > First, to alleviate any rumors to the contrary, there is no support anywhere
> > along the span except the string. It was placed within a couple of inches of
> > the floor to provide a reduced amount of rail climb. The officiating took • into
> > consideration that the overall sag (over a distance of eight feet) was less
> > than one inch. There is a plan currently in the works to have it displayed • at
> > the GATS in Puyallup in November. For that display, there will be no changes
> > to the bridge - there will also be no doubt of its ability to span unaided.
>
> <snip>
> > Wayne
>
>
> Hi Wayne,
>
> I'm sorry if my post sounded like I was challenging the authenticity of
> your accomplishment - I figured that since your bridge was evaluated for
> span length, it was able to stand unaided. From my own (shorter-span)
> bridge creations, I have some appreciation for the problems involved in
> setting up such a large structure, and I had wondered whether you were
> using supports while stringing it, etc. The earlier responses cleared
> up my confusion over the nearby monorail bridge.
>
> My own experience is that the static load on a bridge span usually isn't
> the big problem - it was when I tried driving two trains in opposite
> directions that the induced roll and vibration would sometimes cause the
> trains to jump track at flexing joints. Then again, PNLTC uses bigger
> trains than I do :)
>
> Thanks for the info on your use on ZNAP - that'll be very helpful.
>
> Take care, and congrats!
>
> Jeff
I also had the problem of twisting/rolling at first when a train crossed. This
seemed to be reduced when I added the stretchers across the width of the span
at intervals, although there was still some roll. Even before the stretchers,
though, I never experienced a derailment. The above and below curved Znap
pieces which form a continuous interlocking 'S' were used to strengthen the
horizontal stiffness. Perhaps this also reduced the vibration you experienced.
Throughout the show, we had no trouble with short, medium or long trains
singly or over both tracks, in opposite or same direction. The whole thing
seemed very steady :)
Wayne
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Message is in Reply To:
 | | Re: World Record LEGO Bridge
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| (...) <snip> (...) Hi Wayne, I'm sorry if my post sounded like I was challenging the authenticity of your accomplishment - I figured that since your bridge was evaluated for span length, it was able to stand unaided. From my own (shorter-span) (...) (24 years ago, 23-Aug-00, to lugnet.trains, lugnet.build)
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