Acquista:
La Svizzera occupa una posizione di spicco tra le nazioni costruttrici di gallerie. Se oggi essa si distingue per gli impressionanti progetti infrastrutturali come le trasversali alpine del Lötschberg (in esercizio dal 2007), del Gottardo, (con i suoi 57 km la galleria ferroviaria più lunga al mondo (caduta dell’ultimo diaframma principale il 15.10.2010) e la galleria di base del Ceneri (caduta dell’ultimo diaframma principale il 21.01.2016), nei secoli precedenti furono i pionieri dell’industria turistica a commissionare la costruzione di opere eccezionali: si pensi ad esempio alla Ferrovia della Jungfrau nell’Oberland bernese e al trenino a cremagliera che si inerpica sul Pilatus (trenino a cremagliera più ripido del mondo). Nell’elenco di questi progetti, oggi si inserisce la nuova Stoosbahn: la funicolare più ripida del mondo. Nonostante le gallerie abbiano sezione ridotta, a causa della grande pendenza le sfide tecniche da superare per la loro realizzazione sono state estremamente complesse ed esigenti.
Stoosbahn Switzerland - The steepest cogwheel railway
in the world
Since decades Switzerland occupies a very
significant position among the top ranking,
well known tunnelling nations.
Today everyone thinks of the two most
impressive infrastructure projects to cross
the Swiss alps - the Lötschberg Base tunnel
(operational since 2007) and the famous
Gotthard Base tunnel, opened on 1st of june
2016, being the longest railway tunnel in
the world, with a total length of 57 km.
In previous centuries outstanding construction
works have been commissioned
by the pioneers of the tourism industry as
for example, the Jungfraubahn in the Berner
Oberland and the cog railway to the pilatus
at Lucerne (steepest cogwheel railway
in the world).
To this list of famous tourist-based projects
is actually added another one: the new
“Stoosbahn”, the steepest funicular (cable
car) in the world!
Although smaller in dimension, the tunnelling
expertise necessary and the required technical and logistical know-how for this
particular project had to be of an unprecedented
high level. the essay “The Stoosbahn
- la funicolare più ripida del mondo”
addresses these topics.
The concession of the existing “funiculare
stoos”, which was built in 1933 in Canton
Schwyz, expires and cannot be prolonged.
therefore a new funicular cable car had to
be constructed.
This new cable car, with a slope of up to
110%, is the steepest funicular in the world,
with horizontal entrances to the stations
(comfortable and handicap-approved accesses
for passengers). the commitment to
engage the most modern and innovative
technology available, allows a capacity of
1500 persons per hour. Thanks to automatic
levelling of the standing platform,
the passengers in the 4 compartments
travel in comfort on a permanently horizontal
platform throughout the transfer.
With a total length of 1740 m, the new
stoosbahn covers a height difference of
744 m.
The execution of the construction work was
assigned to the JV IMPLENIA in September
2012 and is to date still ongoing.
From the overall length of 1740 m a total of
230 m run on viaducts, whereas 580 m are
running at ground level, with the remaining
part running in 3 tunnel sections:
– tunnel 1: Zingelifluhtunnel: length 260
m, slope 110%
– tunnel 2: Oberzingeli: length 95 m, slope
110%
– tunnel 3: Stoosfluhtunnel: length 235 m,
gradient 65-23%
The foregoing tunneling works are of small
dimensions, but highly complex. the controlled
target pilot boring at the 110% pitch
was finally, after several incidents, successfully
completed. here the limit of what is
technically possible has been reached!
Technically a fine success, the same cannot
be said from a commercial point of view.
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