Jump to content

Modelling a cable stay double deck bridge


Recommended Posts

Last update 15th of February, the new bridge is coming along, is now in one full piece, but still needs a lot of work to get stop from sagging  not in the middle at the ends the side beam is not in full piece , 3 foot 6 inches short, once I screw on the end section for the arch will be 5 foot in length  when cut , that happen Wednesday, the main span still is 14 feet .

Is going to look stunning when built, be the main feature of the layout, will build the   road deck later . the first two pics of the arch , third pic of the scene I plan to model and pulling of the same scene when the first train runs on the layout , bridge be different  and higher water clearance of 2 feet .

Forth pic I had to clamp a piece of pine to level the centre join  of the bridge , the  last two pics of the bridge standing up on it's own with out clamps , I had to clamp on two 6 foot lengths  of ply to strengthen the bridge sides worked out well, will be better when the other sides go on.  The bridge is stored in the garage and I will screw the other sides on in the garage, need a level floor .

This bridge has being going on for some time with lots of changes, that happens,  with the move a new layout and new bridge, once the bridge is finished will start construction on the layout .

Yest I do have those two locos , they are NR class , running numbers 109 and 74, don't have the Ghan passenger cars will use the Indian Pacific cars no one will know.

Tony from nice down under 

20200415_154642.jpg

20200415_154730.jpg

763628672_ElizaberthRiverbridgefirstGhancrossingaA.jpg.f1dc0b42eab76df9c14ad4d58e13378a.jpg

20200530_153842.jpg

20200530_155720.jpg

20200530_155735.jpg

Link to post
Share on other sites
  • Replies 67
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Popular Posts

At long last the days are cooler in the very low 30's now,, two days of summer left, over the last weekend and Monday I made a lot of progress on one half of the main span of the bridge , finishing th

Being a while since last update on the I was in hospital a few days and while recovering last weekend at home I decided to bite the dust and go back to the old design where the bridge was at the back

Hi Mark, my towers are 3 inches square, am hopping to get away 3/8th round wood dowel ans only 4 cable stays, will chat to my engineer brother in law if I could get away with 4 cable stays, the model

Posted Images

It's starting to look good, Tony.  Glad to know you are getting on with the bridge.  I like the way those low side walls are at a slight inward angle - very neat.  Sounds like you have the weather on your side at present.  Keep up the good work.

Link to post
Share on other sites

Hi Andrew, many thanks yeah I made the side beams like that so I didn't need to file if the the sides were square, hope doing them that way will make the bridge stronger once the arch is screwed in place, I am not hurrying it don't want to stuff up now being so close to finishing the bridge be a stunning site indeed and my main feature of the layout.

Yes weather  is great, can't do much to the due on the grass  dry's, cold nights , 21 degrees tomorrow , not much higher for the rest of the week.

Are you and family ok  out of arms reach of this virus, we are ok 

Take care Tony.

 

20200415_154642.jpg

20200415_154714.jpg

Link to post
Share on other sites
  • 3 weeks later...

The latest pics are out  on the latest update construction on the new bridge, I finely finished screwing the last of the double side beam in place and had time to to see how the first arch half fitted like, wow, just mind blowing, I took off the lower side clamps and the arch stayed in place, the top clamp holding the arch. The middle jig is to support the arch while I screw the arch hangers in place, they will take the most of the load , arch 1 inch and a half wide and joined in the middle with a second skin like the side beam, the second pic showing side on looking down the bridge , the last pic I be modelling the boat  ramp and having a boat in the middle of the river with a film crew  watching the big event of the first train over the bridge and be those two locos I have.

My big day tomorrow, birthday lunch  with my mum wife and sister,  I am finely retired on an old age pension, more work on the layout.

 

Enjoy Tony.

 

 

20200617_153412.jpg

20200617_153433.jpg

20200617_153818.jpg

763628672_ElizaberthRiverbridgefirstGhancrossingaA.jpg.f1dc0b42eab76df9c14ad4d58e13378a.jpg

Link to post
Share on other sites

The bridge has come a long way and finely after all my hard work has paid off  ,on a very big high,  that ply jig in the middle wont be there once the arch  hangers are in place, will be modifying the piers  so the water line clearance be 2 feet in stead of 19 inches .

Be while before I get back to the bridge, be starting work on nailing down the track on the five modules, making a start on the new layout track plan .

Tony from  wet down under keeping on moving ahead.

20200627_160941.jpg

20200627_161058.jpg

Link to post
Share on other sites
  • 2 months later...

The bridge has come a long way with many design changes , finely took out the arch support post in the middle of the arch , was very surprised that it was easy to drill the holes for the arch hangers,  am happy that the arch has actually worked , the main span is 14 feet  and where the saw horses are is where the piers be going,. That is the next job adding and extra 5 inches   for  2 foot clearance to the water line .

Thursday I will buy 4 more lengths of 9 mm round dowel , though I get three hangers out of one length. 

Have being busy last week , gravel is in ready for the  rest of the decking to sit on., once the hangers are in will sand the top of the arch, may have to do some filling as  the cutting of the arches didn't go so well .

 

Tony from down under

 

20200831_145231.jpg

20200831_145255.jpg

20200831_145314.jpg

  • Like 1
Link to post
Share on other sites
  • 3 weeks later...

At long last the bridge constructing is finished other than sand the top of the arch square and tiding up the underneath of the arch ready for painting, it has being a long while since I started this thread , March 2018 with different designs till I came up with this one .

Yes it is a heavy bridge bridge to move on my own from where it is in the garage, I plan to make a small trolley that will clip in underneath  the bridge.

The bridge still is call the Cam river bridge after my late son, since Camdale was renamed, bridge has a 14 foot main span with a height of 6 foot from water line to  top of the arch.

I couldn't get any timber long enough the side bridge beam so I had to join two 7 foot sections together and on the centre line , I measured the side beam in the middle which was 7foot too, I braced the sides still was sagging till the arch was screwed in place, that was a big job, I am on a high the ach has worked.

The bridge will be painted gray and plan to have a jumping platform at the top for hang gliders, the steps wont be on the top of the arch will be on the side saving time in only needing one set of hand rails, come later.

Being also busy with the new approach module track is down, more on my layout page.

Tony from down under 

 

20200919_124057.jpg

20200919_124119.jpg

  • Like 1
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...