Hondricht tunnel
| Hondricht tunnel | ||||
|---|---|---|---|---|
.jpg) ETR 610 leaves the north portal
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| construction | ||||
| Client | Spiez-Frutigen railway | |||
| business | ||||
| operator | Bern-Lötschberg-Simplon Railway | |||
| location | ||||
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| Coordinates | ||||
| North portal | 618982 / 169724 | |||
| South portal | 617725 / 168757 | |||
Map with all coordinates: The Hondrichtunnel is a railway tunnel on the Lötschberg line between the Spiez and Heustrich-Emdthal (formerly Heustrich-Aeschi) stations.
The old Hondricht tunnel was opened as a single-lane 1601 meter long tunnel on July 24, 1901 by the Spiez-Frutigen Railway . The new Hondrich Tunnel, which went into operation on June 12, 1986, is 1710 (Hondrich II) and 1709 meters (Hondrich I) long.
The entire length of the tunnel is located in the municipality of Spiez .
history
The stretch between Spiez and Frutigen was for the most part made double-lane between 1962 and 1965, only the Hondricht tunnel remained single-lane. Shortly after the caretaker's house 1 at the south portal of the old Hondricht tunnel, the switch 200 was installed on the route, from then on the route to Frutigen was double-lane. By the time the timetable was introduced in 1982, it was clear to everyone that the bottleneck in the Hondricht tunnel had to be removed.
The solution implemented at the end consists of a new construction of a second parallel tunnel tube, which is single-lane on the north half and double-lane in the south. This tunnel was built east of the existing Hondricht tunnel. In the northern half, the old tunnel tube of the first Hondrich tunnel is also used, this branch is called Hondrich I, while the branch completely located in the new tunnel is called Hondrich II. The southern half of the old one, however, was given up, so that the curve could be stretched into the Kandertal. This also shortened the route by around 100 meters, but the route kilometers were retained. Due to the larger radii, the line speed could be increased from 80 km / h to 100 km / h.
An industrial connection was set up in 1990 on the old section of the route on the south side.
Old Hondricht tunnel
In mid-June 1899, work on the Hondricht tunnel began on both sides. At the end of 1899, over 600 meters of tunnel had been excavated. As of December 31, 1900, the tunnels had been driven 1,527 meters. The breakthrough took place on January 28, 1901. Of the 1,600 meter tunnel, 1,200 meters did not need to be lined.
The tunnel was opened on July 24, 1901 along with the line. Scheduled operations began on July 25th.
New Hondricht tunnel
The construction of the new Hondricht tunnel was also based on the geological conditions: the northern part was to be driven in gypsum rock, the southern part in loose rock. This is why the solution with the double-single-track tunnel was chosen: the part of the old Hondricht tunnel that was in the rocky area could be preserved with relatively little effort. The boundary between the single-track section and the double-track section was selected accordingly. During the advance of the single-track tunnel from the north, it was found in January 1984 that the transition from gypsum rock to loose rock was not at the assumed location, but reached the tunnel cross-section 80 meters earlier. Without further ado, the branch structure was moved 80 meters to the north in such a way that the branch structure came to rest in the rock as intended.
A small section was created on both sides using the cut-and-cover method, while the main part, or 1,559.2 meters, was excavated by mining. The northern section of opencast mining, 75.3 meters long, was built in 1972 in connection with the construction of the national road. The northern part with the single-track tunnel and the connecting piece to the old Hondricht tunnel was excavated using blasting. The southern part with the double-track section lies in the loose rock and was excavated by means of a callot drive with a knife. The southern open-cast mining section is 75 meters long and around half of it is designed as a covered gallery open on one side. The breakthrough of the new Hondricht tunnel took place on November 2, 1984.
During the excavation, the old tunnel was always in operation and the connecting tunnel was brought up to 4 meters to it. Then the new single-lane tunnel was put into operation, the old tunnel renovated and the profile expanded. The rock wall separating the connecting piece from the old tunnel was also broken through.
The two tunnels Hondrich I and Hondrich II were put into operation on July 12, 1986 as two-lane tunnels. The construction costs amounted to 22 million Swiss francs.
The old abandoned tunnel section was not filled up, but the southern end has been used as a covered parking space for the locomotive of the industrial connection since 1990.
literature
- Claude Jeanmaire : Spiez-Frutigen-Bahn , archive no. 59, old tunnel pages 19ff, new tunnel pages 260ff
Individual evidence
- ↑ source rail network Switzerland , in other sources is also a longitude of 1600 meters
