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There is some more detail on the bridge itself in this video: https://www.youtube.com/watch?v=8tpv6n1ykfA https://www.youtube.com/watch?v=8tpv6n1ykfA The bridg
by comebhack 2y ago
There is some more detail on the bridge itself in this video: https://www.youtube.com/watch?v=8tpv6n1ykfA https://www.youtube.com/watch?v=8tpv6n1ykfA
The bridge is assembled over 2 nights at a motorway exit (so traffic can bypass it by driving off and immediately back on to the road). During night 1 the two end ramps are assembled and attached together to make a short bridge. During night 2 the ramps are driven apart, the central section is built to reach the full length and the entire structure is driven to the final location.
The entire length is 236 meters long providing a working length of 100 meters underneath. The assembled bridge can flex slightly at the joins between sections, and has a turning radius of 2 kilometers.
- MichaelZuo 2y agoHaving to stop traffic, and then redirect it into the one emergency lane, every time 100m is finished in order to advance seems like a huge disadvantage. If the road is anywhere close to max capacity this will cause traffic jams either way.
- leni536 2y agoI would think that merely repositioning can be done overnight.
- bobthepanda 2y agohence why the work requiring the stopping and redirecting happens at night.
- MichaelZuo 2y agoThey can only complete 100m once every 12 hours?
- bobthepanda 2y agowith minimal road disruption, though. at least where I live you'll often seen lane reductions measured in weeks for repaving.
- TylerE 2y agoI've seen projects to pave only a few miles take years. Not even roads that are that busy, even.
- MichaelZuo 2y agoThat doesn't sound right, assuming a lane width of 3.5m, they can only resurface roughly 29 square meters an hours? With all that equipment and manpower.
- bobthepanda 2y agoyou need to scrape all the way to the base and then fill back in when repaving. and you also can't lay asphalt in rain.
- deleted 2y ago[deleted]
- ragebol 2y agoI was under the impression the bridge rolled forward as the works continue.
- michaelt 2y agoPossibly, but unlikely IMHO - it looks like the bridge deploys rigid hydraulic outriggers when stationary, and changes to flexible pneumatic tyres when moving. If the bridge was supported by flexible rubber tyres while heavy trucks were driving over the top of it, it'd probably wobble enough to make everyone involved uncomfortable.
- krisoft 2y agoI don’t think ragebol meant that the bridge rolls forward with traffic on it. Just that once a 100m long stretch is finished they can roll the bridge 100m forward with the traffic re-routed or suspended during the repositiong. If they time it right the resurfacing can be done with minimal disruption in the dead of night.
- red_admiral 2y agoHalf right. At night, they direct all traffic onto the shoulder / emergency lane and roll the bridge forward 100m with no traffic going over it at the time. By day, the bridge is stationary, traffic goes over it, and work goes on underneath.
- tromp 2y agoIt would be awesome if the the entire bridge could slowly move as one while traffic keeps flowing over it. That would require far more and far bulkier wheels than the current ones designed to carry only one support segment. That will have to remain the stuff of fantasies...
- hkdobrev 2y agoThe bridge could temporarily lift just the 2 ends and traffic could continue slowly under the bridge while the bridge moves ahead. However, it needs to also raise its height for trucks to pass under or alternatively, trucks could be temporarily suspended/rerouted from the road while the bridge moves.
- cryptonector 2y agoIf you look carefully, it seems that it can. It has wheels, and it's probably motorized.
- phire 2y agoIt had wheels and it can move. But only with traffic shut down.
- cryptonector 2y agoSure, but that can happen at night with minimal disruption to traffic as it takes only the time to move it, not the time to disassemble, move, and re-assemble.
- itishappy 2y agoTraffic is currently redirected into the emergency lane 100% of the time, so this is still an improvement.
- elaus 2y agoBut usually roads aren't even close to max capacity at night, when the shifting happens – which, I imagine, is much less stressful and time-critical than doing the whole resurfacing in a single night.
- Faaak 2y agoThe whole Marti youtube channel is a marvel for engineering geeks like me. If you have the occasion, you should take a look (talks about tunneling, big machines, etc)
- AdamJacobMuller 2y agoFor a contracting company the videos are exceptionally well produced. They remind me of something more like an early-era discovery channel show like extreme engineering. They just need to get mike rowe to narrate.
- OJFord 2y agoI was more impressed by the OP seemingly from Swiss public body. The Marti one in GP is exactly the sort of sales demo type video I'd expect 'for a contracting company', though with lashings of high speed chase or shooting narrated video (you know, the 40% ads, 50% rehashing what we've seen or telling us what's to come, 10% content variety) for some reason.
- mgdlbp 2y agoFor the bridge only, Marti also made a more sufferable cut in German, that is on the OP channel (https://www.youtube.com/watch?v=VJLX3C0eg3g https://www.youtube.com/watch?v=VJLX3C0eg3g) The segue from CG is much more sensible
- sschueller 2y agoThis one https://www.youtube.com/watch?v=6AV2NcyX7pk https://www.youtube.com/watch?v=6AV2NcyX7pk is insane. Elon's Boring Company is a joke in comparison.
- knodi123 2y ago> and has a turning radius !!!! There's a mindbending sentence.
- ummonk 2y agoWait so all this lets them pave a 100 meters a week (assemble bridge on one weekend, pave on Monday, then disassemble the bridge the next weekend after the asphalt has dried)? That seems horribly slow and expensive.
- cryptonector 2y agoNo. This bridge travels. Look closely: it has wheels and it's motorized.
- Plankaluel 2y agoOnce installed, the bridge can be driven along the road when a 100m segment is finished
- ssl232 2y agoPresumably the road has to be closed for the bridge to travel? I assume this takes place at night.
- tantalor 2y agoThat probably just takes a few hours, easy to do. And you can start/stop a few times to let cars go over.
- giantg2 2y agoIf it's moved slowly enough, I don't see why traffic couldn't drive on it.
- phire 2y agoI guess it's theoretically possible to engineer a bridge that can move with traffic on it. But this bridge is engineered with solid feet for taking traffic loads. The wheels are only extended for movement and wouldn't be able to take the load of traffic.
- deleted 2y ago