Bristol Barrow Road - Lawrence Hill Junction Box - The Walkways
Entry posted by barrowroad
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Before getting on to the construction of the walkways here are a few photos of the 'stench pipe' fabricated from 1.5mm brass tube bent to a suitable shape with the connection to the loo added for good measure!!
After much thought I decided to make the walkways from nickel silver strip and wire in order to give it a degree of strength and to minimise any accidental damage.
Looking at the set of drawings of the 20ft box in Midland Record No 2 there is a good drawing of the handrail clamps which attach them to the uprights.
Using a short length 1mm x 0.2mm nickel silver strip I made a 180deg bend around a 0.45mm thick piece of brass strip using flat nosed pliers. A length of .3mm wire is then placed into the formed 'U' and squeezed onto the wire [ tight fit but still moveable] followed by pinching the two tails of the 1mm strip together with the pliers. A hole - 0.45mm - is then carefully drilled through both the tails and then opened out to 0.55mm to take a brass lace pin. This gives a good representation of the clamp.
My box needed 28 clamps 
Here are a few threaded onto a length of 0.3 wire - they have a tendency to fly away - this keeps them all in one place until use.
The two walkway boards are 7in x 2in on the prototype so I used 2mm x 0.5mm nickel strip to represent them. Pieces of 1mm x 0.2mm strip are used to form the support for the verticals. A 0.45mm hole is hand drilled into one end and opened out to take a lace pin soldered into place using Carrs solder cream. Each strip and pin is then soldered onto the underside of the two walkway pieces [ An RSU was used for this operation]. This is repeated for the appropriate number of supports. Once the required number have been fitted - 12 in the case of the front - the clamps are slotted over the lace pins which are then cut to the correct height. [it is easier to place the clamps over the pointed end of the pin]. A length of 0.3mm wire is threaded through each of the clamps and a home made height gauge used to position the clamps and wire at the correct height.
Finally this is the result.
I have reached the point where a trial fit is required and this shows the benefit of having a removable roof. The walkway has been assembled into a number of sections in order to ease fitting. The largest is the unit consisting of the front/steps and rear half shown above. This drops over the top of the box and sits onto the walkway supports already positioned on the box. The short rear section is seperate and needs to be glued into position after painting. A further 'L' shaped walkway forms the final piece at the left rear of the box.
Here are a few photos;
Finally here is a 'night shot' tken before the walkways were started - I just like it.
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