Luegbrücke
Coordinates: 47 ° 1 ′ 43 ″ N , 11 ° 29 ′ 23 ″ E
| Luegbrücke | ||
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| use |
 Brenner motorway
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| place | between Gries am Brenner and the Brennersee | |
| construction | Slope bridge , girder bridge | |
| overall length | 1804 m | |
| width | 21 m | |
| Pillar spacing | 35.80 m and 72.6 m | |
| start of building | March 1966 | |
| completion | December 1968 | |
| location | ||
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The Luegbrücke is the longest bridge on the Austrian A 13 Brenner motorway and in the ASFINAG area . It is named after the place Lueg in the valley below the bridge, a former cave castle and customs post of medieval Tyrol , of which only a chapel and the Widum still exist.
location
The 1804 m long slope bridge is located in the Wipptal at an altitude of around 1300 m above sea level. A. on the orographically left, wooded steep slope of the Sill between the Obernberg valley crossing near Gries am Brenner and the ASt Brennersee shortly before the Brenner Pass .
description
As usual, the 21 m wide motorway bridge has separate lanes with two lanes each, a hard shoulder and an emergency route between the crash barriers and the railing. It has a constant longitudinal slope of around 2%.
It was designed by the Arbeitsgemeinschaft Innerebner & Mayer , G. Hinteregger and Weller and Co. and executed between March 1966 and December 1968. It stands on difficult subsoil conditions and is considered to be the most complicated structure on the Brenner motorway in terms of both structure and design.
It consists of a 64 m long half bridge for the valley side carriageway at its lower northern end near Gries am Brenner, a 2 m long transition structure and the adjoining 1738 m long main bridge for both carriageways.
The main bridge is divided into five sections, each structurally forming a frame . The half bridge as well as Sections I to III and V are prestressed concrete structures with pillar spacing of 35.8 m. Section IV had to be designed as a steel structure with pillar spacing of 72.6 m because, as was only discovered during construction, it lies on a creeping slope. Slope movements of up to 1 cm per year were feared, which necessitated an expensive foundation of the pillars and a steel structure that was less sensitive to movement of the ground.
The Luegbrücke is not divided into two separate parallel superstructures, but has a continuous, 21 m wide deck. This slab is supported by a 7 m wide, single-cell, rectangular hollow box with a constant height of 2.20 m and 80 cm thick webs. The inner 4.25 m of the carriageway slab, which protrudes 7 m on both sides, is supported by inclined prefabricated slabs that are supported against the lower edges of the box girder. The remaining 2.75 m are freely cantilevered.
The 48 reinforced concrete - pillars are an average of 15 to 25 m high, only in the Sillschlucht they are up to 55 m high. They have a flat, hexagonal hollow cross-section that is just as wide as the box girder of the superstructure, but is only 1.50 m thick in the center of the pillar. In order to protect the sensitive slope with difficult subsoil conditions as much as possible, all piers are on equally narrow and deep foundations, mostly in shafts with a shotcrete jacket , in order to allow subsequent readjustment of the pillar construction. The pillars are built on the slope an average of 20 m deep.
After the piers had been built, the prestressed concrete sections of the bridge were concreted from both ends for reasons of time, each with an advancing scaffold that spanned a full field length and ran through the entire length.
The bridge was built between 1966 and 1968 on behalf of the Brenner Autobahn AG , which has now been incorporated into ASFINAG . In 2002 it was extensively renovated. From 2012 to 2014 the coupling joints were refurbished, the bearings were replaced and the bridge was reinforced with external prestressing.
As it is already in great need of renovation, ASFINAG is planning to build the bridge again, while the state and the population in the Wipptal want a tunnel solution.
literature
- Brenner-Autobahn AG (Ed.): The Brenner-Autobahn. The first full autobahn to cross the Alps . Verlag Tiroler Nachrichten, Innsbruck 1972.
- Fritz Leonhardt: Bridges . Deutsche Verlags-Anstalt, Stuttgart 1982, ISBN 3-421-02590-8 , p. 204
- Marcel Prade: Les grands ponts du monde . Première partie, Ponts remarquables d'Europe. Brissaud à Poitiers, ISBN 2-902170-65-3 , p. 137
Web links
Individual evidence
- ↑ Service booklet 2017 English service booklet from ASFINAG
- ^ K. Wenzel, M. Fenz: The Luegbrücke in the course of the Austrian Brenner motorway. Example for the use of a movable hollow box formwork and an advancing scaffold. In: IABSE congress report = Rapport du congrès AIPC = IVBH Kongressbericht , Volume 9, 1972, pp. 227-234, doi : 10.5169 / seals-9674
- ↑ Fritz Bauer: Prestressed concrete structures: design and manufacture . Springer-Verlag Wien, Vienna 1971, ISBN 978-3-7091-4115-1 , p. 171 ( limited preview in Google Book search).
- ^ The Brenner Autobahn , p. 291
- ↑ The length of the sections is given in the floor plan in Die Brenner-Autobahn (p. 291) as 66.30 + 358.0 + 358.0 + 393.8 + 377.3 + 250.6 m
- ↑ Martin Aschaber, Günter Guglberger, Karl Sporschill: Bridges in Tirol . Studienverlag, Innsbruck 2010, ISBN 978-3-7065-4957-8 , p. 130-131 .
- ↑ Luegbrücke on haben.at
- ↑ Luegbrücke renovation of coupling joints and exchange of bearings on Ebenbichler.net
- ↑ Luegbrücke: state government intervenes. ORF Tirol from November 28, 2019
- ↑ Denise Daum: The Wipptal wants a giant tunnel. Tyrolean daily newspaper from April 26, 2017