Forum Sponsorsss


Forums General Track and Trestles
  • Topic: Lift up bridge questions

    Back To Topics
    (0 rates)
    • May 10, 2020 5:32 PM EDT
      • Bundaberg, Queensland Australia
         
      • Posts
        413
      • Thanks
        13
      • Thanked
        113

      Lift up bridge questions

      I am installing a lift up (as opposed to lift out) bridge to allow access to the centre of the loop.
      It will be hinged at one end and aligned at the non hinged end with lift out rail clamps.
      I am concerned that at the hinged end the rail on the bridge will foul the rail on the base when the bridge is lifted.
      Has anybody done something like this and are there any tips/suggestions that could be passed on?

    • May 10, 2020 6:15 PM EDT
      • West Grove, Pennsylvania
         
      • Posts
        11,151
      • Thanks
        747
      • Thanked
        1,131

      Look under Rick Marty's Shasta Pacific build. He  just did one like that with the hinges on top of the bridge.

      Shasta Pacific

      ____________________________________

      "Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity." --Martin Luther King Jr

    • May 10, 2020 6:17 PM EDT
      • West Grove, Pennsylvania
         
      • Posts
        11,151
      • Thanks
        747
      • Thanked
        1,131

       

      ____________________________________

      "Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity." --Martin Luther King Jr

    • May 10, 2020 8:55 PM EDT
      • Bundaberg, Queensland Australia
         
      • Posts
        413
      • Thanks
        13
      • Thanked
        113

      Thank you for the replies between the knowledge on here and on a UK site I have successfully made a mock up of the hinge/rail configuration and it works perfectly.

      Now all I need to do is to think of a way to disguise the hinges or an explanation for why they are there.

    • May 10, 2020 9:39 PM EDT
      • Chaco, Paraguay
         
      • Posts
        2,721
      • Thanks
        325
      • Thanked
        309

      i did not need it in the end, but i made plans and trials for just that.

      my solution was to use inclined cuts on the rails.

       

      ____________________________________

       

      My Chaosplace ->  

    • May 10, 2020 11:28 PM EDT
      • Kenai, Alaska
         
      • Posts
        162
      • Thanks
        42
      • Thanked
        75

      Did a couple of these for my indoor line, though those are just boards, not bridges.  Main thing is to keep the hinges well above track level - a good half inch or so.  Installation was a bit of a pain - at least doing it solo - trying hold everything in place and out of the way while using the screw gun.

    • May 11, 2020 12:56 AM EDT
      • Bundaberg, Queensland Australia
         
      • Posts
        413
      • Thanks
        13
      • Thanked
        113

      Korm Kormsen said:

      i did not need it in the end, but i made plans and trials for just that.

      my solution was to use inclined cuts on the rails.

       

       

      Thanks Korm that is the effect I was after originally, now I am going back to the drawing board to revisit all the options.

      The gap at the end was/is my biggest concern but this may ease my fears.

      The incline on the hinge end may work for me with my Hillmans clamps at the other end keeping track in line.

      What angle did you plan on using, 45 degrees or shallower?

      Oh did I mention that it will be a double track bridge?  Ben Hur has got nothing on me when it comes to productions.

       

      This post was edited by GAP at May 11, 2020 12:59 AM EDT
    • May 11, 2020 10:03 AM EDT
      • Pleasanton, California
         
      • Posts
        402
      • Thanks
        228
      • Thanked
        120

      Gap, here's my hinge solution.

       

       

       

      ____________________________________

      Dan DeVoto

      P-Town & West Side R.R.

      Pleasanton, California

      https://www.youtube.com/danstrains

    • May 11, 2020 11:09 AM EDT
      • Candlewood Valley, Connecticut
         
      • Posts
        13,559
      • Thanks
        1,332
      • Thanked
        928

      All good solutions.  The key is to get the pivot point near or above the rail head which allows the gap to open rather than bind.  I've done bi-fold bridges with two hinge points: Hinges on top at the beginning of the bridge, and underneath at the fold point.  Old picture, but illustrates the idea.

       

       

      ____________________________________

      www.cvsry.com www.cvsry.com

    • May 12, 2020 12:22 AM EDT
      • Chaco, Paraguay
         
      • Posts
        2,721
      • Thanks
        325
      • Thanked
        309

      What angle did you plan on using, 45 degrees or shallower?

       

      45° should do the trick.

      for double track i got a nice thing. a "gauntlet".  makes for interesting crashes.

      the entrances are made from an LBG crossing.

      description here:  http://kormsen.info/bridges/trussbridge/

       

       

      This post was edited by Korm Kormsen at May 12, 2020 12:23 AM EDT
      ____________________________________

       

      My Chaosplace ->  

    • May 12, 2020 1:20 AM EDT
      • Bundaberg, Queensland Australia
         
      • Posts
        413
      • Thanks
        13
      • Thanked
        113

      Korm Kormsen said:

      What angle did you plan on using, 45 degrees or shallower?

       

      45° should do the trick.

      for double track i got a nice thing. a "gauntlet".  makes for interesting crashes.

      the entrances are made from an LBG crossing.

      description here:  http://kormsen.info/bridges/trussbridge/

       

       

      Hmmm the gauntlet sure is an interesting concept but I think I will pass on that one.

    • May 20, 2020 4:30 PM EDT
      • Bundaberg, Queensland Australia
         
      • Posts
        413
      • Thanks
        13
      • Thanked
        113

      I ended opting to use the method suggested by Korm with the hinges underneath the bridge.

      Some pictures of the start of the bridge build, getting the hinges positioning just right.

      I am using steel gate hinges.

      The opening the will be bridged it is just over 1 metre wide.

      Checking the hinge height, the hinges will recessed into mounting block.

      Hinges from the top;

      Closed

       Open

      A small gap was required to allow the bridge to swing up but it is only slightly wider then the thickness of the deck board so it does not present a problem

    • May 20, 2020 5:45 PM EDT
      • Missouri, It's like Floodsburg, man
         
      • Posts
        2,816
      • Thanks
        333
      • Thanked
        368

      Will be following to see how this materializes.

Forums General Track and Trestles

    Icon Legend

  • Topic has replies
    Hot topic
    Topic unread
    Topic doesn't have any replies
    Closed topic
    BBCode  is enabled
    HTML  is enabled

Add Reputation

Do you want to add reputation for this user by this post?

or cancel

Ads by Google