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Old October 7th, 2013, 10:50 PM   #1021
Maadeuurija
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Quote:
Originally Posted by ChrisZwolle View Post
The first tunnel of Estonia?
Probably in first/longest in the Baltics....
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Old October 7th, 2013, 11:41 PM   #1022
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That's what they claim. Ülemiste tunnel length is 320m and combined length with ramps is 655m.

Btw,this Ülemiste road junction is essentially Southern bypass of Downtown Tallinn. Planned Northern bypass of Downtown - called Põhjaväil - was originally supposed to have 480m tunnel,which would have been partially built beneath Bay of Tallinn under depth of 5 metres. Tunnel was cut from the project during economic depression,but the project hasn't progressed since then and Põhjaväil is currently indefinitely on hold.



Oh,and huge thanks to Rebasepoiss for relaying my photos
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Old October 8th, 2013, 12:32 AM   #1023
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Quote:
Originally Posted by Maadeuurija View Post
Probably in first/longest in the Baltics....
Not the first one, for sure...
There is one in Vilnius, almost as long as ours.
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Old October 8th, 2013, 01:37 AM   #1024
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Quote:
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The first tunnel of Estonia?
This is technically the second road tunnel in Estonia. The first one opened last year at the Iru intersection on the E20/T1 but that one is only 80m long so it looks more like a wide viaduct.
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Old October 8th, 2013, 11:26 AM   #1025
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There are two real tunnels in Vilnius.
First one built during soviet times and was 265 meters. In 2000s it was prolonged almost 100 meters. Now around 360 m.
The second one is 150 meters long, built at the Western bypass.
One more tunnel is planned between Šeškinė and Žirmūnai districts (1500 meters) and the 4th would be Kernavė street tunnel in the NCC (~150 m).
Oh, and there is another one, railway tunnel in Vilnius. 430 meters long, abandoned in the 1960s...



Also Kaunas Akropolis shopping mall parking, that is around 300 meters long and built above King Mindaugas avenue, can be counted.
Oh, and Kaunas railway tunnel, that is older than the London underground and one of the oldest railway tunnels in Europe, is 1285 meters long.


There are tunnels in Riga under railways. It takes some minutes to cross them, quite long. Latvians may help with the numbers.
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Old October 8th, 2013, 11:53 AM   #1026
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Quote:
Originally Posted by Perkūnas View Post
There are tunnels in Riga under railways. It takes some minutes to cross them, quite long. Latvians may help with the numbers.
There are 3 road tunnels under Central Train station. Longest tunnel could be 100 m long on Dzirnavu street.

But there is a twice longer tunnel in Aizkraukle under Pļaviņu hydroelectric power plant.
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Old October 8th, 2013, 02:40 PM   #1027
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Also there is a tunnel in Jēkabpils, but it's only 44 meters long.
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Old October 8th, 2013, 03:15 PM   #1028
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Don't tell these staggering tunnel lengths to a Norwegian or Austrian
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Old October 8th, 2013, 05:23 PM   #1029
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Quote:
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Don't tell these staggering tunnel lengths to a Norwegian or Austrian
Why would any country need a tunnel larger than that needed to accommodate the entire national population?
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Old October 8th, 2013, 07:33 PM   #1030
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looks nice Estonians, hope you will upgrade the network now that budget is stable and financing secured
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Old October 11th, 2013, 01:26 PM   #1031
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A short video of driving through the tunnel and across the viaduct in the newly opened Ülemiste interchange. The traffic jam on the opposite side was apparently due to a traffic accident.

[not my video]
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Old October 12th, 2013, 05:34 PM   #1032
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And some cool night shots of Ülemiste interchange by Tin_Can. The 50km/h speed limit is there for a few weeks to introduce drivers to the new traffic scheme. After that the speed limit will be raised to 70km/h.
Quote:
Originally Posted by Tin_Can View Post
Few photos from Ülemiste road junction.

image hosted on flickr


image hosted on flickr


image hosted on flickr


image hosted on flickr


image hosted on flickr

I know that's a lot of spam about a single project but a €100 million interchange is a major project in a small country like Estonia, considering that the 2013 budget for the Estonian Road Administration is €264 million. This project was funded by the EU (65%) and the city of Tallinn (35%), though.

Fortunately we should see the completion of the dual carriageway on Aruvalla-Kose section of T2/E263 rather soon, hopefully in a month or so. Then there will be other photos to show
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Old October 13th, 2013, 11:08 AM   #1033
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Põhjaväil --> information/maps about this?
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Old October 13th, 2013, 03:29 PM   #1034
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For those of you who don't know, Põhjaväil is basically a Northern inner-city bypass of Tallinn, meant for bypassing the city centre but also to provide better access to the harbour that has very heavy truck traffic. A rough map:



There are several issues with this project which make it very unlikely to get built in the near future.

First of all, the junction shown in red. Due to the closeness of a historic monument, 2 parks and a pedestrian promenade, the public would never allow an at-grade intersection at that point (and so wouldn't I) since it would basically destroy the area. So, to prevent that, there's the option of building a tunnel (on an E-W axis on that map). I think it's not worth mentioning that a tunnel that close to the sea would be rather difficult (read: expensive) to build.

Then there's the section right next to the sea. Again, there's a conflict between public space and cost. Practically all city planners and architects would want to connect the current city centre to the sea. A wide 2x3 avenue with heavy traffic would make achieving that pretty much impossible unless you build the road in a tunnel.

The Western section would have the same problem as the previous one. A 2x3 road is a huge barrier.

It isn't clear how the area next to the harbour will be developed and for that reason, it's also not clear if and how Põhjaväil should be built.
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Old October 13th, 2013, 05:14 PM   #1035
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A tunnel could stay nearer to Narva mnt for most of the way and need not be too near the sea.
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Old October 13th, 2013, 07:18 PM   #1036
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The bottom of the tunnel would still have to be below the sea level.
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Old October 13th, 2013, 08:43 PM   #1037
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That's ok. Tunnel boring is often done below the water table. The presence of water, within limits, makes tunnel boring easier because the important thing is to have relatively constant soil pressure. With cut-and-cover, water is just a nuisance. Here is an example of tunnel boring for a bi-directional road: https://en.wikipedia.org/wiki/Alaska...acement_tunnel
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Old October 13th, 2013, 08:50 PM   #1038
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Many (nearly all) tunnels in the Netherlands are at least partially cut & cover with a high water table almost anywhere. This is a problem they can handle with dewatering techniques.

Using a tunnel boring machine is needlessly expensive. It's only a good option for mountains and deep tunnels.
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Old October 13th, 2013, 10:08 PM   #1039
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Tunnel boring is sometimes also a good option in cities, because it is less disruptive. Ordinary life can continue on the surface.
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Old October 13th, 2013, 10:36 PM   #1040
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Another problem is that there WILL be water inside this tunnel. Knowing our building and engineering quality (even the Loo "tunnel" is often flooded).
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