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Bridge Design


The Fatadder

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A little more progress this afternoon, having found a lot more information on the original road bridge in the MRC article on the North London Scalefour group's Bodmin layout, I have set about drawing up my version of the bridge.

 

Having finished copying the old bridge from their drawings, the next step is going to be adding the more recently built foot bridge (however thankfully there are quite a few photos of this, so it shouldnt be too difficult to suss out the sizes.....)

 

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I have also began thinking about how the bridge will be made,

The plan is to work around a 60tho plasticard core for the supports, which will be faced with the local stone (This needs some experimentation to decide which method for replicating this stone I will use.)

The three bridges will be built as seperate units, and the fitted to the supports once the layout is built, This is a result of a minor problem experienced on Blackcombe where it was very difficult to get decent access under the bridge for painting once it had been fitted to the layout. This time given the added complexity of the local stones colour, much greater access will be required for painting in order to get an acceptable finish.

 

the construction of each bridge is very similar, with a number of longitudinal I beams, with associated cross members with a more detailed mesh barrier on top. The Wentworth branch bridge is a little more complicated being of fabricated iron construction rather than a single beam. I am to add this detail from microstrip, allowing the use of the same long plastic beams as the other 2 bridges.

 

For the barriers I am going for an etched construction, comprising of a stainless steel mesh in brass frame for the footbridge, and multiple part brass etch for the road bridges. this will need a half round section adding to the top to complete the profile. In each case the intention is to etch the whole bridge side as a single component (Saving on soldering and adding strength).

Given the extra cost involved with this, The actual bridge sections will be one of the later components to be built (as I do not want to get the etches done until I am certain that this project will be completed.)

 

Next up I guess its back to playing with the templates on a baseboard, although thats a bit tricky given im still 5ft short of baseboards...

 

While looking for photos of the bridges on fotopic (before it decided to give up working!) I found a better image of the road end of the station building, showing I had made a slight mistake with the roof. this is now corrected.

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