Norwegians build a roundabout in a tunnel

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roadtester
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Norwegians build a roundabout in a tunnel

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Burns
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Re: Norwegians build a roundabout in a tunnel

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I've driven this roundabout. There's one on the other side of the fjord as well. I've driven the Hardanger Bridge a few times and it has to be one of the finest bits of engineering I've seen. Here's my video of the crossing.

As for junctions in tunnels, I've driven a Norwegian tunnel with a regular t-junction in it and I've driven two tunnels with grade separated junctions in them. I wouldn't go as far to say that underground junctions of all types are common in Norway but there are quite a few of them if you know where to look.
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Re: Norwegians build a roundabout in a tunnel

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West Ferry Circus at Canary Wharf, London, is a roundabout in a tunnel (unfortunately no Streetview of the inside).
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nowster
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Re: Norwegians build a roundabout in a tunnel

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Burns wrote: Thu Sep 20, 2018 17:30As for junctions in tunnels, I've driven a Norwegian tunnel with a regular t-junction in it and I've driven two tunnels with grade separated junctions in them. I wouldn't go as far to say that underground junctions of all types are common in Norway but there are quite a few of them if you know where to look.
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Re: Norwegians build a roundabout in a tunnel

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S2+1 crawler lanes are common in sub-sea tunnels due to them usually having 8% to 10% gradients. Running along the sea floor, they'll often drop back to S2 for a bit, meaning the tunnels have interesting profile changes as you pass through them.
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Re: Norwegians build a roundabout in a tunnel

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Burns wrote: Thu Sep 20, 2018 18:08 S2+1 crawler lanes are common in sub-sea tunnels due to them usually having 8% to 10% gradients. Running along the sea floor, they'll often drop back to S2 for a bit, meaning the tunnels have interesting profile changes as you pass through them.
I'd have expected the tunnels to remain a constant width but with the centre area protected by bollards in that scenario, but the cost of wider tunnel bores would not provide any benefit.
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Re: Norwegians build a roundabout in a tunnel

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Bryn666 wrote: Fri Sep 21, 2018 10:09
Burns wrote: Thu Sep 20, 2018 18:08 S2+1 crawler lanes are common in sub-sea tunnels due to them usually having 8% to 10% gradients. Running along the sea floor, they'll often drop back to S2 for a bit, meaning the tunnels have interesting profile changes as you pass through them.
I'd have expected the tunnels to remain a constant width but with the centre area protected by bollards in that scenario, but the cost of wider tunnel bores would not provide any benefit.
Why blast more than you need to? Here's a good example of a profile changing tunnel.
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Re: Norwegians build a roundabout in a tunnel

Post by Al__S »

i guess when you're tunneling through solid rock by blasting, rather than boring through softer ground, it's rather simpler to have a changing profile
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Re: Norwegians build a roundabout in a tunnel

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Never underestimate the Scandinavians' desire to deploy dynamite. :wink:
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Re: Norwegians build a roundabout in a tunnel

Post by Northern Lights »

WOW!!.. :o

….a future James Bond set then??…. :laugh:
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