Riesberg tunnel

Riesberg tunnel
	South-southeast portal of the Riesberg tunnel
use	Railway tunnel
traffic connection	Hanover – Würzburg high-speed line (double-track)
place	Nets / grasses
length	1322 m
Number of tubes	1
cross-section	82-90 m²
business
operator	DB network
release	1991
location
Coordinates
North-Northwest Portal	51 ° 58 ′ 57 ″ N , 9 ° 59 ′ 2 ″ E
South-Southeast Portal	51 ° 58 ′ 19 ″ N , 9 ° 59 ′ 30 ″ E

Map with all coordinates: OSM | WikiMap

The Riesberg tunnel (also Riesenberg tunnel in the planning and construction phase ) is a 1,322 m long railway tunnel on the high-speed line Hanover – Würzburg in the Lower Saxony district of Hildesheim . The tube crosses the Riesberg between Woltershausen and Lamspringe and therefore bears his name.

Geographical location

The Riesberg tunnel is located on average around 2 km east of Woltershausen and 2.5 km northwest of Lamspringe. Located in the Woltershausen municipality, it leads through the unwooded western flank (maximum height above the tunnel around 240 m above sea level ) of the otherwise wooded Riesberg ( 311.1 m above sea level ). Its north-north-west portal is east of Netze and its south-south-east portal is east of Graste , both of which belong to Woltershausen.

course

The tube runs between km 48.5 and km 49.8.

View from the north-north-west portal of the pre-cut with rescue area and transfer point nets.

The route runs in the tunnel, from north-northwest to south-southeast, initially straight and turns into a right-hand bend in the middle of the tunnel. The gradient rises from south-southeast to north-northwest with an initial 12.486 per thousand; in the middle of the tunnel 6.915 per thousand are reached, which flatten towards the south-southeast portal and merge into a gradient of 4.020 per thousand in the south-south-east pre-cut. The maximum cover is 19 m. The highest point of the high-speed route in the Hildesheim district is at the south-south-east portal.

To the south-south-east, an approximately 300 m long incision adjoins the structure, which is followed by a bridge. A crossing with the route of the Lammetalbahn running here at kilometer 50.2 of the new route was not planned, as the closure of the section between Harbarnsen and Lamspringe was foreseeable.

Rocks of the Upper Muschelkalk are penetrated . These are cenrantile and trochitic limestone layers ( mo2 and mo1 ). Due to the consistently near-surface course, the rocks that were present during the construction period were weathered throughout .

cross-section

With a track center distance of 4.70 m, the structure has a base width of 12.50 m and a ridge height of 7.75 m above the top of the rail.

history

planning

In the area of today's tunnel, the spatial planning procedure originally envisaged a cut up to 30 m deep. Alternatively, a tunnel solution was investigated.

Based on a recommendation in the state planning assessment, today's tunnel was developed in the further planning. In 1982 the tunnel was planned with a length of 1070 m. In 1984 the structure was planned to be 1,322 m long.

In the planning phase, the tunnel was in the planning approval section 2.03 (km 47.200 to km 50.950).

construction

The tunnel was built between 1986 and 1988. The tube was excavated from both sides using the mining method ( New Austrian Tunneling Method ). In August 1986, the dome tunneling began from the north-northwest. Due to unfavorable geological conditions, an elm tunnel was planned for the opposite direction. After the geological conditions found during the excavation of the pre-cut were better than planned, a dome drive could also be started. Short areas at the portals should be built using the open construction method .

After the end of work at the turn of the year 1986/87, on January 9, 1987, after four tees at distance kilometers 49,2015, strong cracks appeared in the shotcrete shell. The drive was then stopped and the dome between kilometer 49.168 and 492011 was temporarily secured over a length of 33 m with wooden stamps and other support measures. With the aim of permanently improving the load-bearing properties of the mountain, injections from above were carried out over a length of 50 m between kilometers 49.163 and 49.213 .

The tunneling work was completed in September 1987.

A total of around 160,000 m³ of tunnel excavation and 260,000 m³ of excavation were required for the preliminary cuts. These masses were loaded onto side tippers for over a year at the construction site of the Kassemühle viaduct , which was driven by a class 218 diesel locomotive to Sarstedt on the Sehlem − Bodenburg railway line that still existed at the time . The material was used to backfill a quarry and to fill dams in neighboring building lots .

A total of 1,700 t of steel was used. The building material was delivered on the old railway line from the direction of Bad Gandersheim , which was connected to the new line by a specially made loop north of Lamspringe .

The construction cost was 40 million DM.

Web links

Riesberg tunnel. In: Structurae
Pictures of both portals on eisenbahn-tunnelportale.de

Individual evidence

↑ ^a ^b DB project group Hanover-Würzburg (North) (ed.): New line Hanover-Würzburg: Sehlem, Harbarnsen, Netze . Leporello (14 pages) as of September 1, 1982.
↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Deutsche Bundesbahn, Bundesbahndirektion Hannover, project group Hannover – Würzburg North of the railway construction center: Tunnel construction in the northern section of the new line Hannover – Würzburg , brochure (22 pages), status: January 1987, p. 10.
^ ^A ^b Project group Hannover-Würzburg North of the railway construction center at the Federal Railway Directorate Hannover (Ed.): New line Hannover – Würzburg: The section Hannover – Würzburg: The section Hannover – Northeim . 42-page brochure, 1984, p. 9 f.
↑ ^a ^b ^c ^d ^e DB project group Hanover-Würzburg (North) (Ed.): New line Hanover-Würzburg: Graste. Lamspringe. , Brochure (14 pages, folded) as of July 1, 1984.
↑ ^a ^b Deutsche Bundesbahn (Ed.): New Hanover – Würzburg line. The Hanover – Northeim section . Brochure, 42-page brochure, Hanover 1986, p. 35 f.
↑ ^a ^b DB project group Hanover-Würzburg (North) (ed.): New line Hanover-Würzburg: Graste, Lamspringe . Leporello (14 pages) as of September 1, 1982.
^ DB project group Hanover-Würzburg (North) (Ed.): New line Hanover-Würzburg: Sehlem, Harbarnsen, Netze. , 14-page fanfold dated July 1, 1984.
↑ Horst Geißler: The tunnels in the northern section of the high-speed line Hanover – Würzburg . Hanover 1994, p. 31. ( Supplement to the report of the Natural History Society Hanover , Volume 11, ISSN 0374-6054 )
↑ ^a ^b Project group NBS Hanover of the Bahnbauzentrale, Bundesbahndirektion Hanover (Ed.): Tunnel construction in the northern section of the new Hanover - Würzburg line . Brochure as of November 1987, p. 12.

[nbs-1982-202203n-1] DB project group Hanover-Würzburg (North) (ed.): New line Hanover-Würzburg: Sehlem, Harbarnsen, Netze . Leporello (14 pages) as of September 1, 1982.

[db-nord-1987-10-2] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Deutsche Bundesbahn, Bundesbahndirektion Hannover, project group Hannover – Würzburg North of the railway construction center: Tunnel construction in the northern section of the new line Hannover – Würzburg , brochure (22 pages), status: January 1987, p. 10.

[db-1984-9-3] A ^b Project group Hannover-Würzburg North of the railway construction center at the Federal Railway Directorate Hannover (Ed.): New line Hannover – Würzburg: The section Hannover – Würzburg: The section Hannover – Northeim . 42-page brochure, 1984, p. 9 f.

[nbs-1984-203s204n-4] DB project group Hanover-Würzburg (North) (Ed.): New line Hanover-Würzburg: Graste. Lamspringe. , Brochure (14 pages, folded) as of July 1, 1984.

[db-1986-35-5] Deutsche Bundesbahn (Ed.): New Hanover – Würzburg line. The Hanover – Northeim section . Brochure, 42-page brochure, Hanover 1986, p. 35 f.

[nbs-2.3-1982-6] DB project group Hanover-Würzburg (North) (ed.): New line Hanover-Würzburg: Graste, Lamspringe . Leporello (14 pages) as of September 1, 1982.

[nbs-1984-202203n-7] DB project group Hanover-Würzburg (North) (Ed.): New line Hanover-Würzburg: Sehlem, Harbarnsen, Netze. , 14-page fanfold dated July 1, 1984.

[8] Horst Geißler: The tunnels in the northern section of the high-speed line Hanover – Würzburg . Hanover 1994, p. 31. ( Supplement to the report of the Natural History Society Hanover , Volume 11, ISSN 0374-6054 )

[db-1987-11-12-9] Project group NBS Hanover of the Bahnbauzentrale, Bundesbahndirektion Hanover (Ed.): Tunnel construction in the northern section of the new Hanover - Würzburg line . Brochure as of November 1987, p. 12.