This was a test fitting the outer stringers (crane). Nothing done to them yet .. bolts, weathering etc. Took a break here and attended the Northwestern Heritage Days event in Spencer NC.
I am really happy with how the jigs worked for this. I will be ‘jigging’ much more often from now on.
All of the double stringers have been finished.
Note: The stringers are really just one piece. I cut a ‘false’ joint over every other bent – approx 20-ft.
Now just need the three single stringers under the vehicular access.
In back you can see the Longitudinal tie for the outrigger rail. That was a 12-in sq. timber that’s been notched out to bolt it to the cap. With the notch it is effectively a 10-in. x 12-in solid stringer/tie running the long way. The notches will allow the bolts to sit below the base of the rail.
Note: I have no idea if it was ever done this way but it is how I would have done it had I been given the job of engineering this.
|Tie Test-Fit and Musings|
The bolts were a pain but since you will be able to see the structure through the gaps of the ties I decided to take the time .. again this will be right on the edge of the layout and subject to close inspection!
Here’s a quick pic .. some switch ties laying on the stringers to give an idea how it will look. I have some stock in-route that will be the correct size for the bridge ties but these will suffice as ‘stand-ins’ for the photo op. (Note: these are On30 switch ties from Fast Tracks and measure 0.110″ x 0.150″ – 5-1/4″ x 7-1/4″. I ordered some stripwood from Northeastern Scale Lumber 0.150″ sq.)
For anyone interested in the ‘mechanics’ .. bridge ties were spaced close together because often the rail did not sit directly over the stringers – anywhere from 12-in. to 24-in between centers (this is all from a book – “A treatise on wooden trestle bridges according to the present practice on American railroads” published 1897 which I figure is ‘good nuff’ for a narrow-gauge railroad pier built say .. 20 years after that).
Where the rail was directly supported over the stringers that close gaping of the ties was not critical. These are positioned so a tie sits directly over a cap. That will enable those ties to be bolted through the stringer and through the cap which serves the purpose of securing all three together. For the rest of the ties .. the general procedure was to bolt every three or four ties to the stringer and using spikes for the others. Using bolts, spikes etc. should add interest to the model I think. The spacing for mine will be about 16-1
Blocking (3-in x 12-n) for the vehicular stringers .. all spiked nicely with 3/8″ spikes. Stringers weren’t glued down yet .. that weight was just to keep them in position while the glue dried on the blocking. The rest of the blocking would’t show so they didn’t have spikes and went go in for the same purpose in the full-size pier .. to act as blocking!!!
For the vehicular decking I decided to use craft sticks you can get at WalMart – called ‘Skinny Sticks’ .. they are – Birch? Anyhoo .. they measure .080-in x .250-in .. or .. 4-in x 12-in boards. Perfect for decking. Now .. THEY .. need to show wear .. and least some .. so I would spend some time distressing them.
|Framing complete .. pretty much. At this point I still needed to add some NBW here and there and do some weathering .. the usual but it came out pretty darn well level all around so I was pretty much happy with it at this point. I also had most of the decking cut and pre-weathering started.|