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Double Deck Bridge - In HO Scale
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 Posted: Sat Mar 9th, 2019 10:31 am
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Tony M
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Cam River double deck bridge is coming along nicely.
 
Have finished the first arch, cut the hangers to side and clamped one side onto the road deck.
Wow, worked out perfect.

I still have some anger brackets to screw into place, be an afternoon job when it is cooler.

Wont leave the finished arch outside especially on Monday when peaking 39 degrees,
so much for summer gone and storms from Wednesday .

Tony from warm down under


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 Posted: Sat Mar 9th, 2019 10:34 am
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2foot6
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Do you have any photos and aren't you glad you don't live in Townsville.

.......Peter






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 Posted: Sat Mar 9th, 2019 11:17 am
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Tony M
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Here are the pics of an afternoons work only clamped in place.
 
Will finish screwing the T shape brackets that will hold the the arch hangers to the road deck.

The road deck be 12 mm's higher level with the bottom of the arch frame,
be temperamentally screwed in place,
no need to lift the deck off to get to the train if it derails





I based the arch height on the Sydney Harbor bridge which is to scale 4 feet high,
mine is 3 feet from the rail deck.

Got plans to use the top of the bridge as a a platform for hang gliders,
yes can get hang gliders in HO scale.










The rail deck supports I will be rebutting them all to the same size, with the circular saw jig,
the other half of the rail deck is ready waiting for the road deck 

On top of the supports be frame work every 6 inches,
be enough room to get my hand in to put the coaches rolling stock back on the track.

Supports be an inch wide, wont need hand rails,
down the track will build a walk way for worker access.

 



The road deck will have four lanes with a barrier in the middle and emergency lane each side,
with pedestrian walkway between the emergency lane and bridge hangers.

First side always takes the longest to build, buying more ply on Wednesday,
and the first arch be used as a template for the other three.

One be cut on full piece and second one cut the same,
but will have to put on the paver floor to mark the center line for the hangers,
making it a lot easier than the first one.

Summer is still here we are having 39 degrees Monday probably go higher, 38 Tuesday and 37 Wednesday,
storms predicted Wednesday to Friday, gee we need it bad.
 
Tuesday I be going to my new Train club, only 25 minutes from home,
will depending on the traffic of a morning how quickly I get there.

Soon the bridge be finished, a big task out the way.
A big mile stone and awesome site as well being one of the features of the layout.
Also with the arch being so high should stop the sagging in the middle.

Tony from down under


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 Posted: Sat Mar 9th, 2019 01:06 pm
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pipopak
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WOW! It is huge!

Jose.






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 Posted: Mon Mar 11th, 2019 12:07 am
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Tony M
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Hi Peter and Jose, thanks,

Most of the tower bridges are quite high, including the Sydney harbor bridge.
Even higher than mine is.
Have you seen the pics now Peter?

I still have to cut the supports between the road deck and main deck.
Going to cut new ones on the circular saw miter jig,
setting up a clamp so I can cut every piece the same length.
Still have to screw in place the T brackets that will hold the hangers to the road deck frame.
And repeat it all over again with the second half.

Today be the big test with it being very hot indeed 39 degrees and possible storm.
The hangers are cut from fence paling, want to see if they will bow and twist.
If so is picking the right timber to do the job,
thinking of 12 mm ply cut down to 15 mm  wide.

Tony from very hot down under summer still here


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 Posted: Sat Apr 6th, 2019 10:44 pm
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Tony M
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Camdale is on hold at the moment.


We may be shifting to the bay side of Brisbane, down sizing to a unit.
Haven't seen it yet, so should be this week when we get the keys to have a look.  

The unit has a balcony out front and back, and is at the end of the block,
and we have green space as well, so Camdale would be reborn.


I am in a new train club hopping they will take the layout.
The other option is take it to my Mum's place, she has plenty of room.

Don't want to break the layout up.
If I have to, will take off all the points cross overs and track,
to start a new garden railway.


What I am doing is finishing the bridge off,
want to see if the design will work and not sag in the middle.
All the arches are cut now in full piece saving construction time and a sore back.

I joined up all the arches to see how they fitted, very good indeed.
Yesterday I screwed in place the rail deck support uprights.
Marked out the end sections that arch screws onto at each end.


Rest day today, working on a storage box to fit a 5 car DMU set,
so I can drive it onto the track, pics to follow.


Tony from sunny down under





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 Posted: Sun Apr 7th, 2019 02:12 am
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elminero67
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Looks like a very interesting challenge!



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 Posted: Sun Apr 7th, 2019 11:06 am
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Tony M
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Elminero67, thanks,

I did some more work on the bridge yesterday,
won't get back to the started on frame for the road deck, wont get back to the bridge till Thursday,
will be cutting the last two end pieces for the bridge that is where the arch starts.

What scale do you model??

Tony from down under


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 Posted: Fri Apr 26th, 2019 09:25 pm
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Tony M
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Yet again changes to the bridge.

The bridge didn't work out, it started sagging in the middle.
I decided to do away with that arch design, it wouldn't of worked.

I decided to go for the cantilever bridge design.

Have just about finished one half,
I swapped the arch around so it wasn't wasted.

I still need to screw in ply that will strengthen the arch,
will do that later after finishing the second half.

Yes will go past the tower 3 feet both ends,
to look like the Brisbane Story Bridge.





First and second pic.

Hopefully the piece jutting out will stop the middle from sagging.
 
I measured the tower to lock into the main pier, which will be the same width.
Similar to the pier in the last. 










The last pic.

My river be different to in the pic be wider and no wharf's,
possible cliffs and park land outside, with rail line to the RO-RO Container port.

Good news is we are not moving now.
Camdale had been on hold for a month.

Tomorrow be setting up the last station module, approach and spiral corner module,
to start work on the spiral.

I will still work on the bridge in between,
to finish it so I can paint and start nailing the track down.

Then I be able to screw in place the road deck to completely finish the bridge.

The ship is coming along.
I have cut and glued in place the two last sections, waterline bottom and keel.


Tony from cool mornings down under


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 Posted: Fri Apr 26th, 2019 11:41 pm
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2foot6
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I like the new design, it will be more stable.

I tried a similar project many years ago and gave up after it collapsed.

Looking forward to seeing the completed job.

....Peter




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