Humped back bridge
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(In Topic #13732)
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Road over river
Well, seem to have got my mojo back, and with the discovery of Finnboard have decided to try and scratchbuild a road bridge for Ursa Resurgat. As ever, I first looked at Scalescenes stuff for ideas and toyed with the idea of adapting the canal over-bridge, but , having printed out the arch shape reailised that it was too steep for motor vehicles and had to start from scratch. I chose to use John's 'egg-box' bridge construction to give rigidity and work in Random Ashlar [TX 46] from my Scratchbuilder's yard collection.I took two period[ish] vehicles and tried several contours until I found a shape that didn't ground the rear or the underside of a lorry.
then I set to and cut out some shapes echoing the contours I had chosen. It doesn't show in this shot but the walls lean inwards [batter] at about 1 in 20.
I cut out several parapet shapes, one to go on the outside and two to go on the inside of each wall. As the Finnborad is exactly 2mm thick it scales up to a 24" wall which seems appropriate.
This shows the curved recess between the walls and the parapet pieces which will securely hold the roadway layer…
…and this shows the difference in the radii of the inner and outer wall which will conceal the edge of the arch lining from the outside….
As Finnboard is reputed to be capable of being curved when wet/damp and retains its shape when dry I wanted to try it. I wrapped a piece around a suitable former [ToonaTins!] and I am leaving it to dry for 24 hours.
I chose the largest of the window arches in the TX46 pages, and increased its size by 20% before printing it out several times and cutting out eighty-eight pieces together with two keystones and glued them around each opening. I found UHU solvent-free glue to give the right amount of 'stick and slide'. Note plenty of stiffening pieces inside the armature, if lots of strengthening is good enough for S'Scenes, it's good enough for me!
I have used 6mm balsa to form the vertical components of the butresses. That's it for now, I'll give it a bit more thought before going any further,
Best wishes,
Douglas
Last edit: by Chubber
'You may share the labours of the great, but you will not share the spoil…' Aesop's Fables
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
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Great to see top modelling pouring forth from South Devon.
Best,
Bill
At 6'4'', Bill is a tall chap, then again, when horizontal he is rather long and people often used to trip over him! . . . and so a nickname was born :)
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Last edit: by TeaselBay
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I am sure that would have been "fun" doing that. Not ideal if your hands have the shakes….
but looking good Doug.
Ron
NCE DCC ; 00 scale UK outline.
NCE DCC ; 00 scale UK outline.
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Terry
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Here it is fitted. As a lot of 'end grain' was involved I pre-glued the edges and let them dry so that the glue [Roket Card Glue] would not all be wicked away. A little tidying up with a sandpaper plane gave the result below.
Now, the parapet top needed covering with a coping stone before I went any further. Scalescenes strips of stones are only 10mm wide, so by copying a couple of strips from the PDF and then pasting them to a photo editor [in my case Microsoft Photodraw] I was able to stretch them sideways until they were 14.5mm wide and cut them out to cover the tops of the parapets.
Once in place I drew a line underneath their edges and in the 'gaps' and darkened the lower edges of some of them, then dented and bruised the lower edge of the overhanging stones in one or two places to reflect the fact that they are built up from random ashlar.
I think that's all for now, the next job is to attach the road surface, but I'm still pondering how first to treat the surface. Hhm, would there be drains or would the water simply run away downhill….
Poop-poop!
D
Last edit: by Chubber
'You may share the labours of the great, but you will not share the spoil…' Aesop's Fables
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
Posted
Inactive Member
I have a humpback bridge on my layout that I agonized over. And was never happy with.
Thanks for showing how you did yours. With even more spare time now, I might make another attempt
Cheers
Evan
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D
Last edit: by Chubber
'You may share the labours of the great, but you will not share the spoil…' Aesop's Fables
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
Posted
Full Member
With my boyhood knowledge of Devon and Dartmoor hump back bridges, tempered by a professional life as Chartered Surveyor and PM in the consrtruction sector, the fun humped part would have relied on natural run-off for drainage, then into roadside ditches, since ironwork gratings and underground systems would be seldom seen away from habitated areas.
The road surface for the earliest such structures would certainly have been stone, much later re-surfaced with a sub-base and tarmac. From late 50s to mid-60s, tarmac was the surface of choice for South Devonshire roads and the links below give an idea of condition. In those 'good old days', more council resources may have been used on road maintenance than of late, or more likely the wearing surface lasted longer due to low traffic volumes.
Anyway, a few images to consider:
humpback bridge to Glelands
Small humpbacked bridge that helps walkers and cyclists bypass the water
Bridge with no entry for cars sign
Humpback bridge on a country road
Yes, the above links may be long, but they work (Edited links to shrink em, Barchester)
https://punch.photoshelter.com/image/I0000jZbeNQP0kGo
This last one is just asking to be modelled!
Looking forward to your finished article,
Bill
At 6'4'', Bill is a tall chap, then again, when horizontal he is rather long and people often used to trip over him! . . . and so a nickname was born :)
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Rough grass on the edges, no drainage, slightly elevated median, rough gravel on tar. Sign for single lane either side. Large puddles either side when it rained. That long wheelbase lorry will manage it, not sure about an Austin 7 or 12. There was a really good one just outside Highbury on the A361. My Cortina 1600E had 2 replacement sump covers over the years.
Nigel
©Nigel C. Phillips
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'You may share the labours of the great, but you will not share the spoil…' Aesop's Fables
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
Posted
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The biggest PITA was working out the wraps for the buttresses which were applied last. Hope it encourages someone else to have a go at a bridge!
Douglas
'You may share the labours of the great, but you will not share the spoil…' Aesop's Fables
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
Posted
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Could be a case of live with it, and it'll look OK when in situ.
Ed
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What about some weathered brick work instead. Plenty of examples.
Nigek
©Nigel C. Phillips
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Terry
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Ron
NCE DCC ; 00 scale UK outline.
NCE DCC ; 00 scale UK outline.
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There is some great modelling going in there! It looks brilliant!
Last edit: by TeaselBay
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Michael
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Below is photo of the tops covered with the TX46 paper and bashed about a bit, not at all convincing, but Chris's suggestion has got me thinking……separate stones?If I can cover the parapets with S'scenes paper strips stretched sideways, I could use the same to represent a small number of bigger slabs, say 4-6 on each buttress top??
Watch this space.
Puzzling Doofer
Last edit: by Chubber
'You may share the labours of the great, but you will not share the spoil…' Aesop's Fables
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
Posted
Full Member
As its 1950, the white marker paint on the buttresses is starting to fade away.
Douglas' 'Troubled Bridge over Water….'
Last edit: by Chubber
'You may share the labours of the great, but you will not share the spoil…' Aesop's Fables
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
"Beer is proof that God loves us and wants us to be happy" - Benjamin Franklin
In the land of the slap-dash and implausible, mediocrity is king
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