Grenoble Bridge
Coordinates: 47 ° 16 ′ 28 ″ N , 11 ° 25 ′ 48 ″ E
| Grenoble Bridge | ||
|---|---|---|
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| use | Street | |
| Crossing of | Inn | |
| place | innsbruck | |
| Entertained by | City of Innsbruck | |
| construction | Prestressed concrete - box girder bridge | |
| overall length | 98 m | |
| width | 20.5 m | |
| Number of openings | 3 | |
| building-costs | 20 million shillings | |
| start of building | 1973 | |
| completion | 1975 | |
| opening | November 10, 1975 | |
| location | ||
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The Grenobler Bridge ( Reichenauer Bridge until 1980 ) is a road bridge over the Inn in Innsbruck . It connects the Reichenau on the right bank with the Olympic village on the left bank and is named after the twin city Grenoble .
history
The first plans for a bridge over the Inn at Sandwirt for a direct connection from Arzl to Amras were discussed at a municipal council meeting in February 1919, but were not pursued any further. In 1940 a 120 m long bridge was built at this point by the Innsbruck branch of the technical emergency aid . The wood of the bridge was used for this, which had served as a makeshift bridge during the new construction of the Mühlauer Brücke . At the beginning of 1945 part of the bridge was torn away by a washed-up wooden arch structure that came from a blown bridge near Zirl . In 1946/47 the bridge was rebuilt as a temporary bridge. The bridge, fitted with continuous steel girders, was 102 m long and had a 6 m wide carriageway with two pavements, each 1.5 m wide.
In preparation for the 1976 Winter Olympics , the bridge was rebuilt around 150 m downstream. In the low water period in the winter of 1973/74, construction of the pillars began. The shell of the bridge was completed on May 6, 1975; on November 10, 1975, it was opened to traffic together with the high bridge on Haller Strasse, which had been built at the same time . The old bridge remained in use during the construction period and was only removed in 1979.
On 29 May 1980, the local council, the bridge to the French city decided Grenoble , since 1963, twin city to call Innsbruck. In the fall of 1980, the artificial stone city angel created by Erich Keber was erected on the northern bridgehead , which represents a stylized angel holding the city coat of arms above his head.
In the course of the expansion of the tram , the heavily frequented bus line O to the Olympic Village was replaced by a tram. For this purpose, a separate tram bridge was built from 2016 to 2018 on the underwater side parallel to the existing Grenobler Bridge, which serves pedestrians and cyclists on the lower level. The bridge substructure was constructed in the low water period from November 2016 to March 2017, and in May the steel structure was installed in three stages. The foot and cycle path bridge was released on October 9, 2017, and road construction and track works followed in 2018. The new tram line was opened on January 26, 2019.
construction
Road bridge
The road bridge, built from 1973 to 1975, consists of a three-span concrete box structure that rests on two supports and two river pillars. The supporting structure consists of nine sections 11 m long, which were built in a construction tent on the right bank of the Inn and pushed forward using the incremental launching method . The bridge is 20.5 m wide and 98 m long. It has four lanes and originally two sidewalks. The hollow boxes under the carriageway accommodate supply lines for electricity, gas, water and telephone. Subsequent to the abutments, there are underpasses at both bridgeheads for the footpaths and cycle paths that run along the banks.
The reinforced concrete pillars are 8 m high, 12 m long and 2 m thick and are located 4.5 m below the river bed. They are covered with granite blocks to protect them against debris carried by the Inn .
Tram bridge
Hans Peter Gruber (architecture) and Thomas Sigl (structural engineering) won the invited competition announced by the city of Innsbruck in 2015. Unlike in the tender, pedestrian and bicycle traffic is not routed between the road bridge and the tram route, but below, which decouples it from motorized traffic and connects at the same level to the footpaths and cycle paths that run along the banks.
The bridge is a steel framework construction in composite construction . The tram route runs on the reinforced concrete slab above. The two support levels of the truss bridge are connected at the level of the lower chord with an orthotropic plate that forms the roadway of the pedestrian and bike path.
The spans of the slightly arched bridge are 28.85 + 44.00 + 28.85 m in adaptation to the existing bridge. The lane width of the tram bridge is 6.5 m, that of the pedestrian and cycle path is 3.50 m. The river piers are 5.7 m long and 1.30 m wide at the head. The foot and bike path is indirectly illuminated by LED strips on the upper chords.
The construction costs amounted to 4.44 million euros.
For the bridge, Hans Peter Gruber and Thomas Sigl were awarded the recognition of the State of Tyrol for New Building 2018.
Web links
Individual evidence
- ↑ William Eppacher: The Innbrücken in Innsbruck (circuit). In: Official Journal of the State Capital Innsbruck, No. 3/4, March / April 1954, p. 11 ( digitized version )
- ↑ a b c Innsbruck has two new bridges. In: Official Journal of the State Capital Innsbruck, No. 6, June 1975, p. 1 ( digitized version )
- ↑ Green light at the Reichenauer Brücke - Haller Strasse traffic junction. In: Official Journal of the State Capital Innsbruck, No. 12, December 1975, pp. 1–2 ( digitized version )
- ↑ Bridges in the partnership. Freiburg and Grenoble bridges for Innsbruck. In: Innsbrucker Stadtnachrichten, No. 7, July 23, 1980, p. 4 ( digitized version )
- ↑ Angel at the bridge. In: Innsbrucker Stadtnachrichten, No. 12, December 1980, p. 2 ( digitized version )
- ↑ a b Starting shot for the new Grenobler bridge. Innsbruck informed, October 7, 2016
- ↑ Opening of a new foot and cycle bridge. Innsbruck informed, October 9, 2017
- ↑ With the tram from O-Dorf to the technology. tirol.ORF.at from January 25, 2019
- ^ A b c Thomas Sigl: Second Grenobler Bridge in Innsbruck. Decoupling of the various transports. In: Brückenbau , issue 4/2018, pp. 34–38 ( digital version )
- ↑ Grenobler Bridge - tram, bike and footpath bridge . In: architektur im netz , nextroom.at.
- ↑ Recognition of the land for the Grenoble Bridge. Innsbruck informed, October 19, 2018