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Subject: 
Re: Drawbridge help needed!
Newsgroups: 
lugnet.build, lugnet.trains
Date: 
Thu, 28 Mar 2002 22:45:56 GMT
Viewed: 
991 times
  
In lugnet.build, Kim Toll writes:
In lugnet.build, Pedro Silva writes:
In lugnet.build, Kim Toll writes:
Here's my version of a draw bridge.  Its the first listing under "Bridges"
on my site.

http://www.easystreet.com/~kjmrr/

Your bridge has definately a very impressive mechanism. It does look a
little fragile, but I'm pretty sure it holds solid (it holds a train, right?
:-).

Actually, its quite solid (or was - it is nolonger with us, may it rest in
peace).  Held two trains (its a double track bridge) quite easily, no
problem.  The counterbalance mechanism was quite study also.

It is very complex, nonetheless. Isn't there any simpler (so to speak...)
solution? One less "sturdy"? You see, space is one of the issues I have to
deal with... :-/

Hmm... Well the space is mainly vertical.  Is that a limitation for you?  Or
do you mean the space it takes behind the bridge? (before the start of the
bridge?  I'm not quite sure how to express that thought...)

The latter. I'm not sure if I can fit such a big structure behind the
bridge, since it is possible that other structures may interfere with that
placement of the counterbalance mechanism (namely, a possible crossing
viaduct). I dunno, I must try and see.

I'd guess that this is a pretty economical solution for this problem.  I
don't necessairly mean my personal implementation, but the counterbalance
design in general.  Thes bascule bridges have been used many times in the
real world, and I'm sure they've done enough work to be sure that they are
mechanically viable.

You know what is funny? The only drawbridge I have near me doesn't seem to
have any counterbalance mechanism, at least not visible. But it is not
visitable... :-(
Thefirst time I saw a bridge with such mechanism visible was on a film about
the D-day, somewhere near Caen. It was somehow simpler than yours, I think.

What were your references when you undertook this project? I'd really like
to know more about this particular type of drawbridges.


Pedro



Message is in Reply To:
  Re: Drawbridge help needed!
 
(...) Actually, its quite solid (or was - it is nolonger with us, may it rest in peace). Held two trains (its a double track bridge) quite easily, no problem. The counterbalance mechanism was quite study also. (...) Hmm... Well the space is mainly (...) (22 years ago, 28-Mar-02, to lugnet.build, lugnet.trains)

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