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intrepid44
Original Poster
637 posts
69 months
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I was a little bit bored earlier in the afternoon, so thought I'd design a bridge, so here it is.  It's meant to be a vintage style pedestrian bridge for a new railway station that's about to be built. It's just a preliminary design, just to give me an idea of what I need to do for my 3rd year individual project, and give me a slight head start for next year. I'm a mech eng student, so not use to designing bridges and this is my first atempt, I apologise in advance for Inventors textures! All comments/criticism welcome, let me know what you think!
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randlemarcus
8,725 posts
100 months
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And how are you meant to get a wheelygirl up there? Huh?
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intrepid44
Original Poster
637 posts
69 months
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randlemarcus said: And how are you meant to get a wheelygirl up there? Huh? I didn't think the Victorians had access ramps. Or do they?
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TheEnd
12,089 posts
57 months
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The arches on the second or last rising section to the table top look a little awkward or unfamiliar.
It's only the aesthetics I'm thinking of, but to me it stands out as unexpected.
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PJ S
9,155 posts
96 months
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Those two support sections wouldn't be placed right on the edge of the platform, and the walkway would be extended too, so the angle of the climbing steps would increase or the distance the 4-post sections would be equally displaced.
The arch section on the far side, where the walkway turns 45°, doesn't stack up, and neither does the vertical support stanchion - it's inline with the walkway pair.
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Ayahuasca
16,057 posts
148 months
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It looks like an over-legged sausage dog.
Maybe you can call it the over-legged sausage dog bridge.
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Ayahuasca
16,057 posts
148 months
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On reflection, it's more of a ferret or an otter than a sausage dog.
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bridgdav
4,065 posts
117 months
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Q: Do pedetrians need to go in both directions..?
Or is it a mostly 1 way bridge..? as it is over a railway track.
I had always thought that a bridge should be easier to walk up.. less incline.
Then steeper to walk down - again easier...
Think of it as an ergonomic bridge, steps up are harder than down.
Just a thought..
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John_S4x4
947 posts
126 months
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shirt
14,289 posts
70 months
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a bridge design for your final mech eng project??
1] ask a structural engineering mate about the design basics. have him do the structural calcs for a box of beer to save you the time and hassle. then you can concentrate on making the whole thing look good.
2] you're using inventor, so your design time is halved by drawing only half the bridge then mirroring it over. i would be spending time making the non-structural details much more elaborate. if the bridge is the main part of the project, spend time with a fabricator looking at design for manufacture, and producing BOM's etc.
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a boardman
1,168 posts
69 months
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Ramped access should be about 1 in 10. Ie 10m long for every 1m vertical gain,
with landings to stop long runs.
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DrTre
12,428 posts
101 months
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First thoughts?
Boring and traditional.
You need a paternoster lift at either end to get people up, and helter skelters so they can get down.
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DrTre
12,428 posts
101 months
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wombat172a
1,355 posts
52 months
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Lose the open sided hand rails, HSE wouldn't like the idea that a 4 year old could walk off the side.
Definitely move the columns back though. They want to be far enough away from the track that they won't ever risk being damaged by a train. Once back they also need to be far enough back that it doesn't encourage people to stand in front of them, later to be squashed between the train and the column.
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Piersman2
3,133 posts
68 months
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intrepid44 said: randlemarcus said: And how are you meant to get a wheelygirl up there? Huh? I didn't think the Victorians had access ramps. Or do they? This would indicate they should have had! 
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ninja-lewis
1,894 posts
59 months
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Just copy the bridge at Leuchars. http://g.co/maps/bahykRamps Support sectiosn well away from platform edge No open rails for HSE to have a hissy fit about Vaguely Victorian looking If it's good enough for Network Rail...(actually I wouldn't rely on that!)
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Ganglandboss
6,667 posts
72 months
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I suspect there are too many steps between rest areas - 14 steps is the maximum IIRC (I may not).
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elster
16,646 posts
79 months
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If it is meant to be Victorian I would want it be more statuesque than that and a bit more decoration.
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TheEnd
12,089 posts
57 months
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Another thing common with bridges like that is to totally block off the view to stop people standing on them.
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Neil H
14,756 posts
120 months
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It’s much too close to the edge of the platform.
Also I think some kind of catapult system to launch people over would work better, especially people who realise they’re on the wrong platform when the train comes.
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