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Bristol Barrow Road - Roundhouse Roof Girders


barrowroad

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In my last blog entry - was it really two weeks ago - I mentioned I had started to give some thought to the roof girders which support the two inner pitches of the roundhouse roof.

The three pitched roundhouse roof has four supports - the outer walls form two - the other two are 4' high latticed girders each supported by four cast iron octagonal columns, situated under the two troughs of the roof .

I obtained these columns from Colin Seymour - Alan Gibson - as left over stock from the EM Bath Green Park project that Alan was involved with - they are cast in whitemetal.

 

Having now obtained sufficient stocks of brass and nickel silver section - courtesy of Eileens & Metalsmith Ltd - I decided today to make a start.

 

Here is my scale drawing of one of the 46' lattice girders, six of which are required for the two girders together with four shorter ones each 18'6" long.

 

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The top and bottom of each lattice girder is formed from pieces of 'T' section - 5mm x 3mm - obtained from Metalsmiths. This special section is milled and includes a 0.5mm channel down the centre which I have used to insert and solder lengths of 2mm x 0.5mm nickel silver strip - Eileens.

 

The 4 verticals were cut first and soldered into the bottom 'T' followed by twelve diagonals from the same material.

 

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Finally a piece of 5mm x 0.5mm nickel silver has been soldered at each end to form the vertical 'T' section.

 

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The next job is to cut the twelve pieces of 2.5 x 1.5mm 'T' section brass to form the outer diagonals at the two ends [ they are 7.5" wide] and 2mm x 1.5mm 'T' section for the twelve inner diagonals [ 6" wide ] and solder them in place. To complete each girder a rivetted overlay - top and bottom will need to be formed and added.

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  • RMweb Gold

Brilliant. So very clean and neat. One of the great things about this hobby is how the design and construction of an individual girder can be a satisfying project in itself - also for those who are just watching it happen. Please keep it coming.

 

 

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Robin,

 

There's nothing quite as satisfying (modellingwise that is!) as a nicely completed bit of soldering. Once you've cracked the first one, the rest will be a piece of cake! biggrin.gif

 

John

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