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Old July 5th, 2012, 11:29 AM   #661
Momo1435
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From what I remember reading here or in magazine the main reason why the Porta Alpina station was scrapped (not just put on hold) because of operational problem mainly caused by safety issues.

If remember correctly it would not be allowed to have people down in the station without a train in the station. So a train would have to wait until all the people that disembarked would be in the lift. The stops of the trains would have become too long reducing the overall capacity of the tunnel.

The number of people that would be using the station was also too low for the investments that would be needed to make this station work. And because of the safety issues a increase in passengers would also mean bigger on the operational side, see above paragraph.

And I would translate a statement like "it has been decided not to do anything that would make it impossible in the future." as we're not going to spend extra money to change the tunnels that have already been built.

It was a nice idea to use this shaft as station, but it simply wasn't feasible.

btw, thanks for the nice pictures.
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Old July 5th, 2012, 11:57 PM   #662
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Some caverns were built for Porta Alpina, although they were not planned in the project. These are now useless, but will allow opening of the station in a far future - if this will ever happen.

Beside a regular operation, I think that making some special trains every some years with a visit of the tunnel system, included the shafts and tunnel to Sedrun, would attract some people. Usually when they open for visits the worksites they attract around 4.000 people each time.
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Old July 8th, 2012, 04:27 PM   #663
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@Coccodrillo: Your pictures are awesome! Excellent job, Herr Eidgenosse!
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Old July 8th, 2012, 10:27 PM   #664
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Quote:
Originally Posted by Coccodrillo View Post
The underground cavern for the future branch tunnel to Arth Goldau. If built the underground section will be around 80 km long. This is the eastern tube, where around 8 km of track have been already laid from the north (much less, say around 1 km, in the other tube). On the other side of the tunnel, 50 km south, there are 13 km of track in the western tube (it's there where from autumn 2013 the first electric trains will be tested up to 230 km/h, not more at this stage of works because the track will not be enough long).

[IMG]http://i46.************/2mzbd5w.jpg[/IMG]
Is this looking towards the north portal at Erstfeld? Assuming that that branch is built, how long will trains using line be continually underground?



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Old July 9th, 2012, 12:22 AM   #665
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Sure, it is looking north, around 4 km from Erstfeld portal.

How long? A lot...around 80 km/50 miles, I don't know exactly, as it depents whether the crossing of the plain around Brunnen-Ingenbohl is above or below ground. It may vary between 75 and 85 km.

Here are the two portals: http://goo.gl/maps/feah (the position of the northern portal isn't exactly defined yet)

The Ceneri and Zimmerberg base tunnels have such underground junctions, too. The Ceneri would eb extended from 15.4 km/9.6 mi to around 40 km/25 mi, the Zimmerberg from 10 km/6.25 mi to 20 km/12.5 mi.

There would be some additional "shorter" tunnels (~8 km/5 miles each) planned, this means 170 km/106 mi our of around 240 km/150 mi (I don't know the exact figures) between Milan and Zürich. There is then the project for a single track freight-only branch (this one) with around 40 km/25 miles of tunnels.

But all of these are only projects, unlikely to be built before 2050 (if they will be built...), with the exception of the additional 10 km of the Zimmerberg base tunnel (up to 20 km) and a single track 8 km/5 mi bypass tunnel around Bellinzona (with provision for a second track) that may be built before...2040 - but not before 2025.

Beside that on other lines there is the new Lötschberg base tunnel 34.5 km/22 mi long and 5 other railway tunnels varying between 14 and 20 km/9 and 13 miles, including those build in the XIX century and up to the 1920s.
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Old July 10th, 2012, 12:32 PM   #666
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Woah this tunnel is enormous. Beautiful Switzerland shows rest of the world how to build big things. Congratulations I hope that I will pass this tunnel someday Thanks for photos Coccodrillo.
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Old July 13th, 2012, 01:24 AM   #667
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The updated PDF describing the project is now available also in English (10 MB):

http://www.alptransit.ch/en/media/publications.html

http://www.alptransit.ch/fileadmin/d..._e_2012_lq.pdf

More detailed documents are available in German and/or Italian (See the respective language versions of the website).

Technical documents are here, some also in English: http://www.alptransit.ch/en/media/te...-lectures.html

And on Lombardi's website: http://www.lombardi.ch/en/publicatio...und-structures (Swiss engineering company that helped with the construction)
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Old August 25th, 2012, 10:54 AM   #668
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One of the two short artificial tunnels south of the base tunnel. A third track will be posed later on the left, as now the new infrastructure is used as a work road.

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Old August 25th, 2012, 12:08 PM   #669
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In their website about the construction progress they often talk about "concreting the bench" (from German Bankette). I'm never quite sure what exactly it means... As far as I understand this German word usually refers to the hard shoulder of highways. Anyone here can explain what it means in this context?
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Old August 25th, 2012, 12:27 PM   #670
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I think they are the (prefabricated?) concrete bars that act as walkway and are posed on the side of the tunnel. They also include some "ducts" that will later host cables.

Those on the sides on this photo, under the chemical toilet: http://i50.************/nbcaxd.jpg

On the left "bankette" there is what seems to be a gate used to pose and later access the cables.
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Old August 25th, 2012, 10:26 PM   #671
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Quote:
Originally Posted by Coccodrillo View Post
I think they are the (prefabricated?) concrete bars that act as walkway and are posed on the side of the tunnel. They also include some "ducts" that will later host cables.

Those on the sides on this photo, under the chemical toilet: http://i50.************/nbcaxd.jpg

On the left "bankette" there is what seems to be a gate used to pose and later access the cables.
Thanks
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Old August 26th, 2012, 12:18 AM   #672
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AlpTransit has quite a few new pics uploaded of the work in progress on GBT and the Ceneri Base Tunnel:

http://www.alptransit.ch/en/photos/g...se-tunnel.html

http://www.alptransit.ch/en/photos/c...se-tunnel.html
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Old September 12th, 2012, 02:25 PM   #673
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A view of the junction north of the Ceneri base tunnel. On the right the old rail bridge to Luino and Locarno, on the left the new one which will be moved to the right when the old one will have been demolished. Another bridge will be built parallel to the left for the line to the CBT, so a total of four track will cross the A2 motorway. On the background is one of the two single track viaducts to the CBT. The old Ceneri railway, which will continue to be used, diverges to the left just before the photographer. South of Bellinzona there will thus be a total of three junctions with four branches. Of these four branches, two merges again around 20 km south in Lugano (and then continue to Italy with two tracks), one continues single track to Italy (via Luino) and one ends in Switzerland in Locarno.

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Old September 12th, 2012, 04:10 PM   #674
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Great postingd everyone, thanks for sharing them. We in the US (particularly New Jersey) could learn a few lessons here.
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Old September 28th, 2012, 11:19 PM   #675
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If problems don't arise, the loading gauge the Gotthard route will be enlarged by 2020, at least on the Swiss side, where most of the tunnels are located. Switzerland may finance works also on Italian territory. Total cost will be around 940 millions, including Italian tunnels. The Gotthard summit route (Erstfeld-Biasca) will obviously not adapted and will keep its existing profile (around PC 60/384). All the base tunnels and their nearby new short cut&cover tunnels are being built with EBV 4 profile, which equals roughly to PC 100/410 or gabarit C, while older tunnels will be enlarged to the slightly smaller EBV 3 profile, still enough for 4 m high trucks.

In Switzerland the planned works are:
* a new Bözberg tunnel will be built (2526 m long)
* enlargement of 8 different short tunnels with a total length of 2335 m
* some others works on the Monte Ceneri section to allow access to Lugano Vedeggio freight yard
* the shifting of a lot of signals, passenger shelters, and similar objects along the whole line

All other tunnels between Basel and Chiasso have been enlarged in the previous years (a total of around 10 km).

I don't know how much work has to be done on the Italian sections (around 8 km of tunnels on the Luino branch, and a single 7.2 km tunnel plus two ~500 m tunnels on the Chiasso-Milano branch).

http://www.news.admin.ch/message/ind...e&msg-id=46058
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Old October 2nd, 2012, 12:15 PM   #676
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On Saturday 29th September there was an open day at Sigirino, the intermediate access to the Ceneri base tunnel from where most of the tunnel is being bored (around 14.400 m from here, 700 from the north and 300 from the south).

To the right is the excavated material, this new mountain will be covered by grass and vegetation.

[IMG]http://i48.************/2uj1jqb.jpg[/IMG]

The cavern used for the production of concrete. It is parallel to the main tubes and will later be useless, except in case of emergency.

[IMG]http://i45.************/143qjcw.jpg[/IMG]
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Old October 2nd, 2012, 12:15 PM   #677
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Equipments are as much as possible hung on the ceiling. If I remember correctly this is the northbound tube, temporarily used as a logistic cavern.

[IMG]http://i45.************/1zq6hed.jpg[/IMG]

Yellow denotes the bored part, but the short sections bored from the north (700 m) and from the south (300 m) are not shown. The tunnel is on a ramp, the northern portal being at around 250 m, the southern one around 100 m above.

[IMG]http://i46.************/21mcglg.jpg[/IMG]
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Old October 2nd, 2012, 12:16 PM   #678
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The overhead platform is mounted on rails, and it is moved forward as the boring proceeds.

[IMG]http://i47.************/23wmloh.jpg[/IMG]

Here we see the rails hung to the ceiling and the platforms running below them. There were a lot of families visiting the tunnel, the youngest (and happiest!) visitor being around one year old.

[IMG]http://i48.************/2j1q1jk.jpg[/IMG]
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Old October 2nd, 2012, 12:17 PM   #679
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This machine is used to break in small pieces the bored rock. It runs on continuous tracks and charges the bored material on the belts hung on the ceiling.

[IMG]http://i49.************/2q84is4.jpg[/IMG]

The rock face, here around 150 m below the surface. The deepest point of the Ceneri base tunnel is around 800 m below the surface, on the Gotthard base tunnel is around 2300 m.

[IMG]http://i46.************/2isk0oo.jpg[/IMG]

One of the two access tunnels in Sigirino. One was built between 1997 and 2000 to explore the geology (that's why it continues after the main tubes ending nowhere under the mountain), has a single lane and is now used only to bring in fresh air. This tunnel instead is larger, two trucks can cross each other albeit at low speed, and is the main link to the surface. It also hosts three non reversible conveyors belts, two used to bring out the rock and one used to bring in the material for the production of concrete. Part of this material comes from the bored rocks, partly from quarries as the bored rock is not always suited for concrete (unlike the Gotthard rock).

[IMG]http://i48.************/29y18hy.jpg[/IMG]
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Old October 2nd, 2012, 01:08 PM   #680
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Quote:
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Equipments are as much as possible hung on the ceiling. If I remember correctly this is the northbound tube, temporarily used as a logistic cavern.

[IMG]http://i45.************/1zq6hed.jpg[/IMG]
No, that is the entrance tunnel. (I was there too )
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